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Wt::WGLWidget Class Reference

GL support class. More...

#include <Wt/WGLWidget>

Inheritance diagram for Wt::WGLWidget:
Inheritance graph
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Classes

class  ArrayBuffer
 Reference to a javascript ArrayBuffer class. More...
 
class  AttribLocation
 Reference to a shader attribute location. More...
 
class  Buffer
 Reference to a WebGLBuffer class. More...
 
class  Framebuffer
 Reference to a WebGLFramebuffer class. More...
 
class  GlObject
 Abstract base class for all GL objects. More...
 
class  JavaScriptMatrix4x4
 A client-side JavaScript matrix. More...
 
class  JavaScriptVector
 A client-side JavaScript vector. More...
 
class  Program
 Reference to a WebGLProgram class. More...
 
class  Renderbuffer
 Reference to a WebGLRenderbuffer class. More...
 
class  Shader
 Reference to a WebGLShader class. More...
 
class  Texture
 Reference to a WebGLTexture class. More...
 
class  UniformLocation
 Reference to a WebGLUniformLocation class. More...
 

Public Types

enum  RenderOption { ClientSideRendering = 0x1, ServerSideRendering = 0x2, AntiAliasing = 0x4 }
 Enumeration for render options. More...
 
enum  ClientSideRenderer { PAINT_GL = 0x1, RESIZE_GL = 0x2, UPDATE_GL = 0x4 }
 Specifies what GL function needs to be updated. More...
 
enum  GLenum
 The enormous GLenum. More...
 

Public Member Functions

 WGLWidget (WContainerWidget *parent=0)
 Construct a GL widget. More...
 
 ~WGLWidget ()
 Destructor.
 
void setRenderOptions (WFlags< RenderOption > options)
 Sets the rendering option. More...
 
void repaintGL (WFlags< ClientSideRenderer > which)
 Request invocation of resizeGL, paintGL and/or updateGL. More...
 
bool restoringContext () const
 Returns whether a lost context is in the process of being restored. More...
 
void resize (const WLength &width, const WLength &height)
 Resizes the widget. More...
 
void setClientSideMouseHandler (const std::string &handlerCode)
 Set a custom mouse handler based on the given JavaScript code. More...
 
void setClientSideLookAtHandler (const JavaScriptMatrix4x4 &m, double lX, double lY, double lZ, double uX, double uY, double uZ, double pitchRate, double yawRate)
 Add a mouse handler to the widget that looks at a given point. More...
 
void setClientSideWalkHandler (const JavaScriptMatrix4x4 &m, double frontStep, double rotStep)
 Add a mouse handler to the widget that allows 'walking' in the scene. More...
 
void setAlternativeContent (WWidget *alternative)
 Sets the content to be displayed when WebGL is not available. More...
 
JSlotrepaintSlot ()
 A JavaScript slot that repaints the widget when triggered. More...
 
void enableClientErrorChecks (bool enable=true)
 enable client-side error messages (read detailed doc!) More...
 
void injectJS (const std::string &jsString)
 Inject JavaScript into the current js-stream. More...
 
GL methods

The GL methods are mostly 1-on-1 translated to the identical JavaScript call in WebGL. You can use the GL methods in your resizeGL(), paintGL() and updateGL() specializations. Wt takes care that data, arguments, ... are transfered to the client side and that the equivalent JavaScript WebGL funtion is executed when using client-side rendering. When using server-side rendering, the appropriate OpenGL functions are called.

void activeTexture (GLenum texture)
 GL function to activate an existing texture. More...
 
void attachShader (Program program, Shader shader)
 GL function to attach a shader to a program. More...
 
void bindAttribLocation (Program program, unsigned index, const std::string &name)
 GL function to bind an attribute to a given location. More...
 
void bindBuffer (GLenum target, Buffer buffer)
 GL function to bind a buffer to a target. More...
 
void bindFramebuffer (GLenum target, Framebuffer framebuffer)
 GL function to bind a frame buffer to a target. More...
 
void bindRenderbuffer (GLenum target, Renderbuffer renderbuffer)
 GL function to bind a render buffer to a target. More...
 
void bindTexture (GLenum target, Texture texture)
 GL function to bind a texture to a target. More...
 
void blendColor (double red, double green, double blue, double alpha)
 GL function to set the blending color. More...
 
void blendEquation (GLenum mode)
 GL function to set the blending equation. More...
 
void blendEquationSeparate (GLenum modeRGB, GLenum modeAlpha)
 GL function that sets separate blending functions for RGB and alpha. More...
 
void blendFunc (GLenum sfactor, GLenum dfactor)
 GL function to configure the blending function. More...
 
void blendFuncSeparate (GLenum srcRGB, GLenum dstRGB, GLenum srcAlpha, GLenum dstAlpha)
 GL function that configures the blending function. More...
 
void bufferData (GLenum target, int size, GLenum usage)
 glBufferData - create and initialize a buffer object's data store More...
 
void bufferData (GLenum target, ArrayBuffer res, GLenum usage)
 glBufferData - create and initialize a buffer object's data store from an ArrayBuffer More...
 
void bufferData (GLenum target, ArrayBuffer res, unsigned arrayBufferOffset, unsigned arrayBufferSize, GLenum usage)
 glBufferData - create and initialize a buffer object's data store from an ArrayBuffer More...
 
void bufferSubData (GLenum target, unsigned offset, ArrayBuffer res)
 Initialize a buffer object's data store from an ArrayBuffer. More...
 
void bufferSubData (GLenum target, unsigned offset, ArrayBuffer res, unsigned arrayBufferOffset, unsigned size)
 Initialize a buffer object's data store from an ArrayBuffer. More...
 
template<typename Iterator >
void bufferDatafv (GLenum target, const Iterator begin, const Iterator end, GLenum usage, bool binary=false)
 GL function that loads float or double data in a VBO. More...
 
template<typename Iterator >
void bufferDataiv (GLenum target, const Iterator begin, const Iterator end, GLenum usage, GLenum type)
 GL function that loads integer data in a VBO. More...
 
template<typename Iterator >
void bufferSubDatafv (GLenum target, unsigned offset, const Iterator begin, const Iterator end, bool binary=false)
 GL function that updates an existing VBO with new float or double data. More...
 
template<typename Iterator >
void bufferSubDataiv (GLenum target, unsigned offset, const Iterator begin, Iterator end, GLenum type)
 GL function that updates an existing VBO with new integer data. More...
 
void bufferDatafv (GLenum target, const std::vector< float > &buffer, GLenum usage, bool binary=false)
 GL function that loads float or double data in a VBO. More...
 
void clearBinaryResources ()
 remove all binary buffer resources More...
 
void bufferDataiv (GLenum target, std::vector< int > &buffer, GLenum usage, GLenum type)
 GL function that updates an existing VBO with new integer data. More...
 
void bufferSubDatafv (GLenum target, unsigned offset, const std::vector< float > &buffer, bool binary=false)
 GL function that updates an existing VBO with new float data. More...
 
void bufferSubDataiv (GLenum target, unsigned offset, std::vector< int > &buffer, GLenum type)
 GL function that loads integer data in a VBO. More...
 
void clear (WFlags< GLenum > mask)
 GL function that clears the given buffers. More...
 
void clearColor (double r, double g, double b, double a)
 GL function that sets the clear color of the color buffer. More...
 
void clearDepth (double depth)
 GL function that configures the depth to be set when the depth buffer is cleared. More...
 
void clearStencil (int s)
 GL function. More...
 
void colorMask (bool red, bool green, bool blue, bool alpha)
 GL function. More...
 
void compileShader (Shader shader)
 GL function to compile a shader. More...
 
void copyTexImage2D (GLenum target, int level, GLenum internalformat, int x, int y, unsigned width, unsigned height, int border)
 GL function to copy a texture image. More...
 
void copyTexSubImage2D (GLenum target, int level, int xoffset, int yoffset, int x, int y, unsigned width, unsigned height)
 GL function that copies a part of a texture image. More...
 
Buffer createBuffer ()
 GL function that creates an empty VBO. More...
 
ArrayBuffer createAndLoadArrayBuffer (const std::string &url)
 Function that creates an ArrayBuffer by loading data from a given URL. (deprecated) More...
 
Framebuffer createFramebuffer ()
 GL function that creates a frame buffer object. More...
 
Program createProgram ()
 GL function that creates an empty program. More...
 
Renderbuffer createRenderbuffer ()
 GL function that creates a render buffer object. More...
 
Shader createShader (GLenum shader)
 GL function that creates an empty shader. More...
 
Texture createTexture ()
 GL function that creates an empty texture. More...
 
Texture createTextureAndLoad (const std::string &url)
 GL function that creates an image texture. More...
 
WPaintDevicecreatePaintDevice (const WLength &width, const WLength &height)
 returns an paintdevice that can be used to paint a GL texture More...
 
void cullFace (GLenum mode)
 GL function that configures the backface culling mode. More...
 
void deleteBuffer (Buffer buffer)
 GL function that deletes a VBO. More...
 
void deleteFramebuffer (Framebuffer framebuffer)
 GL function that deletes a frame buffer. More...
 
void deleteProgram (Program program)
 GL function that deletes a program. More...
 
void deleteRenderbuffer (Renderbuffer renderbuffer)
 GL function that deletes a render buffer. More...
 
void deleteShader (Shader shader)
 GL function that depetes a shader. More...
 
void deleteTexture (Texture texture)
 GL function that deletes a texture. More...
 
void depthFunc (GLenum func)
 GL function to set the depth test function. More...
 
void depthMask (bool flag)
 GL function that enables or disables writing to the depth buffer. More...
 
void depthRange (double zNear, double zFar)
 GL function that specifies to what range the normalized [-1,1] z values should match. More...
 
void detachShader (Program program, Shader shader)
 GL function that detaches a shader from a program. More...
 
void disable (GLenum cap)
 GL function to disable features. More...
 
void disableVertexAttribArray (AttribLocation index)
 GL function to disable the vertex attribute array. More...
 
void drawArrays (GLenum mode, int first, unsigned count)
 GL function to draw a VBO. More...
 
void drawElements (GLenum mode, unsigned count, GLenum type, unsigned offset)
 GL function to draw indexed VBOs. More...
 
void enable (GLenum cap)
 GL function to enable features. More...
 
void enableVertexAttribArray (AttribLocation index)
 GL function to enable the vertex attribute array. More...
 
void finish ()
 GL function to wait until given commands are executed. More...
 
void flush ()
 GL function to force execution of GL commands in finite time. More...
 
void framebufferRenderbuffer (GLenum target, GLenum attachment, GLenum renderbuffertarget, Renderbuffer renderbuffer)
 GL function to attach the given renderbuffer to the currently bound frame buffer. More...
 
void framebufferTexture2D (GLenum target, GLenum attachment, GLenum textarget, Texture texture, int level)
 GL function to render directly into a texture image. More...
 
void frontFace (GLenum mode)
 GL function that specifies which side of a triangle is the front side. More...
 
void generateMipmap (GLenum target)
 GL function that generates a set of mipmaps for a texture object. More...
 
AttribLocation getAttribLocation (Program program, const std::string &attrib)
 GL function to retrieve an attribute's location in a Program. More...
 
UniformLocation getUniformLocation (Program program, const std::string location)
 GL function to retrieve a Uniform's location in a Program. More...
 
void hint (GLenum target, GLenum mode)
 GL function to give hints to the render pipeline. More...
 
void lineWidth (double width)
 GL function to set the line width. More...
 
void linkProgram (Program program)
 GL function to link a program. More...
 
void pixelStorei (GLenum pname, int param)
 GL function to set the pixel storage mode. More...
 
void polygonOffset (double factor, double units)
 GL function to apply modifications to Z values. More...
 
void renderbufferStorage (GLenum target, GLenum internalformat, unsigned width, unsigned height)
 GL function to allocate the appropriate amount of memory for a render buffer. More...
 
void sampleCoverage (double value, bool invert)
 GL function to set multisample parameters. More...
 
void scissor (int x, int y, unsigned width, unsigned height)
 GL function to define the scissor box. More...
 
void shaderSource (Shader shader, const std::string &src)
 GL function to set a shader's source code. More...
 
void stencilFunc (GLenum func, int ref, unsigned mask)
 GL function to set stencil test parameters. More...
 
void stencilFuncSeparate (GLenum face, GLenum func, int ref, unsigned mask)
 GL function to set stencil test parameters for front and/or back stencils. More...
 
void stencilMask (unsigned mask)
 GL function to control which bits are to be written in the stencil buffer. More...
 
void stencilMaskSeparate (GLenum face, unsigned mask)
 GL function to control which bits are written to the front and/or back stencil buffers. More...
 
void stencilOp (GLenum fail, GLenum zfail, GLenum zpass)
 GL function to set stencil test actions. More...
 
void stencilOpSeparate (GLenum face, GLenum fail, GLenum zfail, GLenum zpass)
 GL function to set front and/or back stencil test actions separately. More...
 
void texImage2D (GLenum target, int level, GLenum internalformat, unsigned width, unsigned height, int border, GLenum format)
 GL function to reserve space for a 2D texture, without specifying its contents. More...
 
void texImage2D (GLenum target, int level, GLenum internalformat, GLenum format, GLenum type, WImage *image)
 GL function to load a 2D texture from a WImage. More...
 
void texImage2D (GLenum target, int level, GLenum internalformat, GLenum format, GLenum type, WVideo *video)
 GL function to load a 2D texture from a WVideo. More...
 
void texImage2D (GLenum target, int level, GLenum internalformat, GLenum format, GLenum type, std::string filename)
 GL function to load a 2D texture from a file. More...
 
void texImage2D (GLenum target, int level, GLenum internalformat, GLenum format, GLenum type, WPaintDevice *paintdevice)
 GL function to load a 2D texture from a WPaintDevice. More...
 
void texImage2D (GLenum target, int level, GLenum internalformat, GLenum format, GLenum type, Texture texture)
 GL function to load a 2D texture loaded with createTextureAndLoad() More...
 
void texParameteri (GLenum target, GLenum pname, GLenum param)
 GL function to set texture parameters. More...
 
void uniform1f (const UniformLocation &location, double x)
 GL function to set the value of a uniform variable of the current program. More...
 
template<typename FloatArray >
void uniform1fv (const UniformLocation &location, const FloatArray *value)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform1fv (const UniformLocation &location, const JavaScriptVector &v)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform1i (const UniformLocation &location, int x)
 GL function to set the value of a uniform variable of the current program. More...
 
template<typename IntArray >
void uniform1iv (const UniformLocation &location, const IntArray *value)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform2f (const UniformLocation &location, double x, double y)
 GL function to set the value of a uniform variable of the current program. More...
 
template<typename FloatArray >
void uniform2fv (const UniformLocation &location, const FloatArray *value)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform2fv (const UniformLocation &location, const JavaScriptVector &v)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform2i (const UniformLocation &location, int x, int y)
 GL function to set the value of a uniform variable of the current program. More...
 
template<typename IntArray >
void uniform2iv (const UniformLocation &location, const IntArray *value)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform3f (const UniformLocation &location, double x, double y, double z)
 GL function to set the value of a uniform variable of the current program. More...
 
template<typename FloatArray >
void uniform3fv (const UniformLocation &location, const FloatArray *value)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform3fv (const UniformLocation &location, const JavaScriptVector &v)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform3i (const UniformLocation &location, int x, int y, int z)
 GL function to set the value of a uniform variable of the current program. More...
 
template<typename IntArray >
void uniform3iv (const UniformLocation &location, const IntArray *value)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform4f (const UniformLocation &location, double x, double y, double z, double w)
 GL function to set the value of a uniform variable of the current program. More...
 
template<typename FloatArray >
void uniform4fv (const UniformLocation &location, const FloatArray *value)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform4fv (const UniformLocation &location, const JavaScriptVector &v)
 GL function to set the value of a uniform variable of the current program. More...
 
void uniform4i (const UniformLocation &location, int x, int y, int z, int w)
 GL function to set the value of a uniform variable of the current program. More...
 
template<typename IntArray >
void uniform4iv (const UniformLocation &location, const IntArray *value)
 GL function to set the value of a uniform variable of the current program. More...
 
template<typename MatrixType >
void uniformMatrix2fv (const UniformLocation &location, bool transpose, const MatrixType *value)
 GL function to set the value of a uniform matrix of the current program. More...
 
template<typename MatrixType >
void uniformMatrix2 (const UniformLocation &location, const WGenericMatrix< MatrixType, 2, 2 > &m)
 GL function to set the value of a uniform matrix of the current program. More...
 
template<typename MatrixType >
void uniformMatrix3fv (const UniformLocation &location, bool transpose, const MatrixType *value)
 GL function to set the value of a uniform matrix of the current program. More...
 
template<typename MatrixType >
void uniformMatrix3 (const UniformLocation &location, const WGenericMatrix< MatrixType, 3, 3 > &m)
 GL function to set the value of a uniform matrix of the current program. More...
 
template<typename MatrixType >
void uniformMatrix4fv (const UniformLocation &location, bool transpose, const MatrixType *value)
 GL function to set the value of a uniform matrix of the current program. More...
 
template<typename MatrixType >
void uniformMatrix4 (const UniformLocation &location, const WGenericMatrix< MatrixType, 4, 4 > &m)
 GL function to set the value of a uniform matrix of the current program. More...
 
void uniformMatrix4 (const UniformLocation &location, const JavaScriptMatrix4x4 &m)
 GL function to set the value of a uniform matrix of the current program. More...
 
void useProgram (Program program)
 GL function to set the current active shader program. More...
 
void validateProgram (Program program)
 GL function to validate a program. More...
 
void vertexAttrib1f (AttribLocation location, double x)
 GL function to set the value of an attribute of the current program. More...
 
template<typename FloatArray >
void vertexAttrib1fv (AttribLocation location, const FloatArray *values)
 GL function to set the value of an attribute of the current program. More...
 
void vertexAttrib2f (AttribLocation location, double x, double y)
 GL function to set the value of an attribute of the current program. More...
 
template<typename FloatArray >
void vertexAttrib2fv (AttribLocation location, const FloatArray *values)
 GL function to set the value of an attribute of the current program. More...
 
void vertexAttrib3f (AttribLocation location, double x, double y, double z)
 GL function to set the value of an attribute of the current program. More...
 
template<typename FloatArray >
void vertexAttrib3fv (AttribLocation location, const FloatArray *values)
 GL function to set the value of an attribute of the current program. More...
 
void vertexAttrib4f (AttribLocation location, double x, double y, double z, double w)
 GL function to set the value of an attribute of the current program. More...
 
template<typename FloatArray >
void vertexAttrib4fv (AttribLocation location, const FloatArray *values)
 GL function to set the value of an attribute of the current program. More...
 
void vertexAttribPointer (AttribLocation location, int size, GLenum type, bool normalized, unsigned stride, unsigned offset)
 GL function to bind a VBO to an attribute. More...
 
void viewport (int x, int y, unsigned width, unsigned height)
 GL function to set the viewport. More...
 
Client-side vectors and matrices

These methods can be used to modify vectors and matrices client-side, to change the GL uniforms without a roundtrip to the server.

JavaScriptMatrix4x4 createJavaScriptMatrix4 ()
 Create a matrix that can be manipulated in client-side JavaScript. More...
 
void addJavaScriptMatrix4 (JavaScriptMatrix4x4 &m)
 Register a matrix with this WGLWidget. More...
 
void initJavaScriptMatrix4 (JavaScriptMatrix4x4 &m)
 Initialize the client-side JavaScript for the given JavaScriptMatrix4x4. More...
 
template<typename MatrixType >
void setJavaScriptMatrix4 (JavaScriptMatrix4x4 &jsm, const WGenericMatrix< MatrixType, 4, 4 > &m)
 Set the value of a client-side JavaScript matrix created by createJavaScriptMatrix4x4() More...
 
JavaScriptVector createJavaScriptVector (unsigned length)
 Create a vector of a certain length that can be manipulated in client-side JavaScript. More...
 
void addJavaScriptVector (JavaScriptVector &v)
 Register a vector with this WGLWidget. More...
 
void initJavaScriptVector (JavaScriptVector &v)
 Initialize the client-side JavaScript for the given JavaScriptVector. More...
 
void setJavaScriptVector (JavaScriptVector &jsv, const std::vector< float > &v)
 Set the value of a client-side JavaScript vector created by createJavaScriptVector() More...
 
- Public Member Functions inherited from Wt::WInteractWidget
 WInteractWidget (WContainerWidget *parent=0)
 Create an InteractWidget with optional parent.
 
EventSignal< WKeyEvent > & keyWentDown ()
 Event signal emitted when a keyboard key is pushed down. More...
 
EventSignal< WKeyEvent > & keyPressed ()
 Event signal emitted when a "character" was entered. More...
 
EventSignal< WKeyEvent > & keyWentUp ()
 Event signal emitted when a keyboard key is released. More...
 
EventSignalenterPressed ()
 Event signal emitted when enter was pressed. More...
 
EventSignalescapePressed ()
 Event signal emitted when escape was pressed. More...
 
EventSignal< WMouseEvent > & clicked ()
 Event signal emitted when a mouse key was clicked on this widget. More...
 
EventSignal< WMouseEvent > & doubleClicked ()
 Event signal emitted when a mouse key was double clicked on this widget. More...
 
EventSignal< WMouseEvent > & mouseWentDown ()
 Event signal emitted when a mouse key was pushed down on this widget. More...
 
EventSignal< WMouseEvent > & mouseWentUp ()
 Event signal emitted when a mouse key was released on this widget. More...
 
EventSignal< WMouseEvent > & mouseWentOut ()
 Event signal emitted when the mouse went out of this widget. More...
 
EventSignal< WMouseEvent > & mouseWentOver ()
 Event signal emitted when the mouse entered this widget. More...
 
EventSignal< WMouseEvent > & mouseMoved ()
 Event signal emitted when the mouse moved over this widget. More...
 
EventSignal< WMouseEvent > & mouseDragged ()
 Event signal emitted when the mouse is dragged over this widget. More...
 
EventSignal< WMouseEvent > & mouseWheel ()
 Event signal emitted when the mouse scroll wheel was used. More...
 
EventSignal< WTouchEvent > & touchStarted ()
 Event signal emitted when a finger is placed on the screen. More...
 
EventSignal< WTouchEvent > & touchEnded ()
 Event signal emitted when a finger is removed from the screen. More...
 
EventSignal< WTouchEvent > & touchMoved ()
 Event signal emitted when a finger, which is already placed on the screen, is moved across the screen. More...
 
EventSignal< WGestureEvent > & gestureStarted ()
 Event signal emitted when a gesture is started. More...
 
EventSignal< WGestureEvent > & gestureChanged ()
 Event signal emitted when a gesture is changed. More...
 
EventSignal< WGestureEvent > & gestureEnded ()
 Event signal emitted when a gesture is ended. More...
 
void setDraggable (const std::string &mimeType, WWidget *dragWidget=0, bool isDragWidgetOnly=false, WObject *sourceWidget=0)
 Configure dragging for drag and drop. More...
 
void setMouseOverDelay (int delay)
 Sets a delay for the mouse over event. More...
 
int mouseOverDelay () const
 Returns the mouse over signal delay. More...
 
virtual void setPopup (bool popup)
 Lets the widget overlay over other sibling widgets. More...
 
virtual void load ()
 Loads content just before the widget is used. More...
 
virtual bool isEnabled () const
 Returns whether the widget is enabled. More...
 
- Public Member Functions inherited from Wt::WWebWidget
 WWebWidget (WContainerWidget *parent=0)
 Construct a WebWidget with a given parent. More...
 
virtual void setPositionScheme (PositionScheme scheme)
 Sets the CSS position scheme. More...
 
virtual PositionScheme positionScheme () const
 Returns the CSS position scheme. More...
 
virtual void setOffsets (const WLength &offset, WFlags< Side > sides=All)
 Sets CSS offsets for a non-statically positioned widget. More...
 
virtual WLength offset (Side s) const
 Returns a CSS offset. More...
 
virtual WLength width () const
 Returns the width. More...
 
virtual WLength height () const
 Returns the height. More...
 
virtual void setMinimumSize (const WLength &width, const WLength &height)
 Sets a minimum size. More...
 
virtual WLength minimumWidth () const
 Returns the minimum width. More...
 
virtual WLength minimumHeight () const
 Returns the minimum height. More...
 
virtual void setMaximumSize (const WLength &width, const WLength &height)
 Sets a maximum size. More...
 
virtual WLength maximumWidth () const
 Returns the maximum width. More...
 
virtual WLength maximumHeight () const
 Returns the maximum height. More...
 
virtual void setLineHeight (const WLength &height)
 Sets the CSS line height for contained text.
 
virtual WLength lineHeight () const
 Returns the CSS line height for contained text. More...
 
virtual void setFloatSide (Side s)
 Specifies a CSS float side. More...
 
virtual Side floatSide () const
 Returns the CSS float side. More...
 
virtual void setClearSides (WFlags< Side > sides)
 Sets the sides that should be cleared of floats. More...
 
virtual WFlags< SideclearSides () const
 Returns the sides that should remain empty. More...
 
virtual void setMargin (const WLength &margin, WFlags< Side > sides=All)
 Sets CSS margins around the widget. More...
 
virtual WLength margin (Side side) const
 Returns a CSS margin set. More...
 
virtual void setHiddenKeepsGeometry (bool enabled)
 Sets whether the widget keeps its geometry when hidden. More...
 
virtual bool hiddenKeepsGeometry () const
 Returns whether the widget keeps its geometry when hidden. More...
 
virtual void setHidden (bool hidden, const WAnimation &animation=WAnimation())
 Hides or shows the widget. More...
 
virtual bool isHidden () const
 Returns whether the widget is set hidden. More...
 
virtual bool isVisible () const
 Returns whether the widget is visible. More...
 
virtual void setDisabled (bool disabled)
 Sets whether the widget is disabled. More...
 
virtual bool isDisabled () const
 Returns whether the widget is set disabled. More...
 
virtual bool isPopup () const
 Returns whether the widget is overlayed. More...
 
virtual void setInline (bool isInline)
 Sets whether the widget is displayed inline or as a block. More...
 
virtual bool isInline () const
 Returns whether the widget is displayed inline or as block. More...
 
virtual void setDecorationStyle (const WCssDecorationStyle &style)
 Sets a CSS decoration style. More...
 
virtual WCssDecorationStyledecorationStyle ()
 Returns the decoration style of this widget. More...
 
virtual void setStyleClass (const WString &styleClass)
 Sets (one or more) CSS style classes. More...
 
virtual WString styleClass () const
 Returns the CSS style class. More...
 
virtual void addStyleClass (const WString &styleClass, bool force=false)
 Adds a CSS style class. More...
 
virtual void removeStyleClass (const WString &styleClass, bool force=false)
 Removes a CSS style class. More...
 
virtual bool hasStyleClass (const WString &styleClass) const
 Returns whether the widget has a style class.
 
virtual void setVerticalAlignment (AlignmentFlag alignment, const WLength &length=WLength())
 Sets the vertical alignment. More...
 
virtual AlignmentFlag verticalAlignment () const
 Returns the vertical alignment. More...
 
virtual WLength verticalAlignmentLength () const
 Returns the fixed vertical alignment that was set. More...
 
virtual void setToolTip (const WString &text, TextFormat textFormat=PlainText)
 Sets a tooltip. More...
 
virtual void setDeferredToolTip (bool enable, TextFormat textFormat=PlainText)
 Enable deferred tooltip. More...
 
virtual WString toolTip () const
 Returns the tooltip.
 
virtual void refresh ()
 Refresh the widget. More...
 
virtual void setAttributeValue (const std::string &name, const WString &value)
 Sets an attribute value. More...
 
virtual WString attributeValue (const std::string &name) const
 Returns an attribute value. More...
 
virtual void setJavaScriptMember (const std::string &name, const std::string &value)
 Sets a JavaScript member. More...
 
virtual std::string javaScriptMember (const std::string &name) const
 Returns the value of a JavaScript member. More...
 
virtual void callJavaScriptMember (const std::string &name, const std::string &args)
 Calls a JavaScript member. More...
 
virtual bool loaded () const
 Returns whether this widget has been loaded. More...
 
virtual void setId (const std::string &id)
 Sets the CSS Id. More...
 
virtual WWidgetfind (const std::string &name)
 Finds a descendent widget by name. More...
 
virtual WWidgetfindById (const std::string &id)
 Finds a descendent widget by id.
 
virtual void setSelectable (bool selectable)
 Sets as selectable. More...
 
virtual void doJavaScript (const std::string &javascript)
 Executes the given JavaScript statements when the widget is rendered or updated. More...
 
virtual const std::string id () const
 Returns the (unique) identifier for this object. More...
 
void setLoadLaterWhenInvisible (bool)
 Change the way the widget is loaded when invisible. More...
 
const std::vector< WWidget * > & children () const
 Returns contained widgets. More...
 
SignalchildrenChanged ()
 Signal emitted when children have been added or removed. More...
 
virtual void setCanReceiveFocus (bool enabled)
 Sets whether the widget can receive focus. More...
 
virtual bool canReceiveFocus () const
 Returns whether the widget can receive focus. More...
 
virtual bool setFirstFocus ()
 Set focus on the widget's first descendant. More...
 
virtual void setFocus (bool focus)
 Sets focus. More...
 
virtual bool hasFocus () const
 Returns whether the widget currently has the focus.
 
virtual void setTabIndex (int index)
 Sets the tab index. More...
 
virtual int tabIndex () const
 Returns the tab index. More...
 
EventSignalblurred ()
 Signal emitted when the widget lost focus. More...
 
EventSignalfocussed ()
 Signal emitted when the widget recieved focus. More...
 
- Public Member Functions inherited from Wt::WWidget
virtual ~WWidget ()
 Destructor. More...
 
WWidgetparent () const
 Returns the parent widget. More...
 
virtual void removeChild (WObject *child)
 Removes a child object. More...
 
void setWidth (const WLength &width)
 Sets the width. More...
 
void setHeight (const WLength &height)
 Sets the height. More...
 
virtual void positionAt (const WWidget *widget, Orientation orientation=Vertical)
 Positions a widget next to another widget. More...
 
virtual void toggleStyleClass (const WString &styleClass, bool add, bool force=false)
 Toggles a CSS style class.
 
std::string jsRef () const
 Returns a JavaScript expression to the corresponding DOM node. More...
 
void setFocus ()
 Sets focus. More...
 
virtual void acceptDrops (const std::string &mimeType, const WString &hoverStyleClass=WString())
 Sets a mime type to be accepted for dropping. More...
 
virtual void stopAcceptDrops (const std::string &mimeType)
 Indicates that a mime type is no longer accepted for dropping. More...
 
virtual void htmlText (std::ostream &out)
 Streams the (X)HTML representation. More...
 
bool isRendered () const
 Returns whether the widget is rendered. More...
 
void hide ()
 Hides the widget. More...
 
void animateHide (const WAnimation &animation)
 Hides the widget using an animation. More...
 
void show ()
 Shows the widget. More...
 
void animateShow (const WAnimation &animation)
 Shows the widget using an animation. More...
 
void enable ()
 Enables the widget. More...
 
void disable ()
 Disable thes widget. More...
 
bool layoutSizeAware () const
 Returns whether the widget is layout size aware. More...
 
- Public Member Functions inherited from Wt::WObject
 WObject (WObject *parent=0)
 Create a WObject with a given parent object. More...
 
virtual ~WObject ()
 Destructor. More...
 
virtual void setObjectName (const std::string &name)
 Sets an object name. More...
 
virtual std::string objectName () const
 Returns the object name. More...
 
void resetLearnedSlots ()
 Resets learned stateless slot implementations. More...
 
template<class T >
void resetLearnedSlot (void(T::*method)())
 Resets a learned stateless slot implementation. More...
 
template<class T >
WStatelessSlot * implementStateless (void(T::*method)())
 Declares a slot to be stateless and learn client-side behaviour on first invocation. More...
 
template<class T >
WStatelessSlot * implementStateless (void(T::*method)(), void(T::*undoMethod)())
 Declares a slot to be stateless and learn client-side behaviour in advance. More...
 
template<class T >
WStatelessSlot * implementJavaScript (void(T::*method)(), const std::string &jsCode)
 Provides a JavaScript implementation for a method. More...
 
void addChild (WObject *child)
 Adds a child object. More...
 
const std::vector< WObject * > & children () const
 Returns the children.
 
WObjectparent () const
 Returns the parent object.
 

Protected Member Functions

virtual void initializeGL ()
 Initialize the GL state when the widget is first shown. More...
 
virtual void resizeGL (int width, int height)
 Act on resize events. More...
 
virtual void paintGL ()
 Update the client-side painting function. More...
 
virtual void updateGL ()
 Update state set in initializeGL() More...
 
virtual void render (WFlags< RenderFlag > flags)
 Renders the widget. More...
 
virtual void layoutSizeChanged (int width, int height)
 Virtual method that indicates a size change. More...
 
- Protected Member Functions inherited from Wt::WInteractWidget
virtual void propagateSetEnabled (bool enabled)
 Propagates that a widget was enabled or disabled through children. More...
 
- Protected Member Functions inherited from Wt::WWebWidget
virtual void enableAjax ()
 Progresses to an Ajax-enabled widget. More...
 
virtual WStatelessSlot * getStateless (Method method)
 On-demand stateless slot implementation. More...
 
- Protected Member Functions inherited from Wt::WWidget
void setLayoutSizeAware (bool sizeAware)
 Sets the widget to be aware of its size set by a layout manager. More...
 
 WWidget (WContainerWidget *parent=0)
 Creates a widget. More...
 
virtual void dropEvent (WDropEvent dropEvent)
 Handles a drop event. More...
 
virtual int boxPadding (Orientation orientation) const
 Returns the widget's built-in padding. More...
 
virtual int boxBorder (Orientation orientation) const
 Returns the widget's built-in border width. More...
 
void scheduleRender (WFlags< RepaintFlag > flags=0)
 Schedules rerendering of the widget. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from Wt::WWebWidget
static WString escapeText (const WString &text, bool newlinesToo=false)
 Escape HTML control characters in the text, to display literally (deprecated). More...
 
static std::string & escapeText (std::string &text, bool newlinestoo=false)
 Escape HTML control characters in the text, to display literally (deprecated). More...
 
static bool removeScript (WString &text)
 Remove tags/attributes from text that are not passive (deprecated). More...
 
static std::string jsStringLiteral (const std::string &v, char delimiter= '\'')
 Turn a UTF8 encoded string into a JavaScript string literal. More...
 
- Static Protected Member Functions inherited from Wt::WObject
static WObjectsender ()
 Returns the sender of the current slot call. More...
 

Detailed Description

GL support class.

The WGLWidget class is an interface to the HTML5 WebGL infrastructure for client-side rendering, and OpenGL for server-side rendering. Its API is based on the WebGL API. To fully understand WebGL, it is recommended to read the WebGL standard in addition to this documentation.

The most recent version of the WebGL specification can be found here: http://www.khronos.org/registry/webgl/specs/latest/1.0/

The goal of the WGLWidget class is to provide a method to render 3D structures in the browser, where rendering and rerendering is normally done at the client side in JavaScript without interaction from the server, in order to obtain a smooth user interaction. Unless the scene requires server-side updates, there is no communication with the server.

The rendering interface resembles to OpenGL ES, the same standard as WebGL is based on. This is a stripped down version of the normal OpenGL as we usually find them on desktops. Many stateful OpenGL features are not present in OpenGL ES: no modelview and camera transformation stacks, no default lighting models, no support for other rendering methods than through VBOs, ... Therefore much existing example code for OpenGL applications and shaders will not work on WebGL without modifications. The 'learning webgl' web site at http://learningwebgl.com/ is a good starting point to get familiar with WebGL.

To use a WGLWidget, you must derive from it and reimplement the painter methods. Usually, you will always need to implement initializeGL() and paintGL(). Optionally, you may choose to implement resizeGL() (if your widget does not have a fixed size), and updateGL(). If you need to modify the painting methods, a repaint is triggered by calling the repaintGL() method. The default behaviour for any of these four painting functions is to do nothing.

The four painter methods (initializeGL(), resizeGL(), paintGL() and updateGL()) all record JavaScript which is sent to the browser. The JavaScript code of paintGL() is cached client-side, and may be executed many times, e.g. to repaint a scene from different viewpoints. The JavaScript code of initializeGL(), resizeGL() and updateGL() are intended for OpenGL state updates, and is therefore only executed once on the client and is then discarded.

There are four painting methods that you may implement in a specialization of this class. The purpose of these functions is to register what JavaScript code has to be executed to render a scene. Through invocations of the WebGL functions documented below, Wt records the JavaScript calls that have to be invoked in the browser.

The GL functions are intended to be used exclusively from within the invocation of the four callback functions mentioned above. In order to manually trigger the execution of these function, use the repaintGL().

A WGLWidget must be given a size explicitly, or must be put inside a layout manager that manages its width and height. The behaviour of a WGLWidget that was not given a size is undefined.

Binary buffer transfers

In bufferDatafv(), there is an additional boolean argument where you can indicate that you want the data to be transferred to the client in binary form. A WMemoryResource is created for each of these buffers. If you know all previous resources are not required in the client anymore, you can free memory with the method clearBinaryResources() (the memory is also managed, so this is not neccesary). If you want to manage these resources entirely by yourself, the following method can be used.

Using createAndLoadArrayBuffer(), you can load an array buffer in binary format from an URL. This will cause the client to fetch the given URL, and make the contents of the file available in an ArrayBuffer, which can then be used by BufferData() to bind them to an OpenGL buffer. This is ideal to load VBO buffers in a faster way, as it avoids converting floats to text strings on the server and then back to floats on the client. You can combine this with the use of WResource (e.g. WMemoryResource) to send an std::vector of vertices to the client. Note that using ArrayBuffer is not possible when you want a fall-back in the form of server-side rendering.

Client side matrices and vectors.

The WGLWidget provides the WGLWidget::JavaScriptMatrix4x4 class as a mechanism to use client-side modifiable matrices in the render functions. These matrices can be used identically to the 'constant', with the advantage that there is no need to have a roundtrip to the server to redraw the scene when they are changed. As such, they are ideal for mouse-based camera manipulations, timer triggered animations, or object manipulations.

There's also support for client-side modifiable vectors, with WGLWidget::JavaScriptVector.

Member Enumeration Documentation

Specifies what GL function needs to be updated.

Enumerator
PAINT_GL 

refresh paintGL()

RESIZE_GL 

refresh resizeGL()

UPDATE_GL 

refresh updateGL()

The enormous GLenum.

This enum contains all numeric constants defined by the WebGL standard, see: http://www.khronos.org/registry/webgl/specs/latest/1.0/#WEBGLRENDERINGCONTEXT

Enumeration for render options.

See Also
setRenderOptions()
Enumerator
ClientSideRendering 

Enables client-side rendering.

ServerSideRendering 

Enables server-side rendering.

AntiAliasing 

Enables anti-aliasing.

Constructor & Destructor Documentation

Wt::WGLWidget::WGLWidget ( WContainerWidget parent = 0)

Construct a GL widget.

Before the first rendering, you must apply a size to the WGLWidget.

Member Function Documentation

void Wt::WGLWidget::activeTexture ( GLenum  texture)

GL function to activate an existing texture.

glActiveTexture() OpenGL ES manpage

void Wt::WGLWidget::addJavaScriptMatrix4 ( JavaScriptMatrix4x4 m)

Register a matrix with this WGLWidget.

You can call this outside of resizeGL(), paintGL(), updateGL() or initializeGL() methods. After a JavaScriptMatrix4x4 is added to a WGLWidget, its jsRef() becomes valid, and can be used in a JSlot, for example.

void Wt::WGLWidget::addJavaScriptVector ( JavaScriptVector v)

Register a vector with this WGLWidget.

You can call this outside of resizeGL(), paintGL(), updateGL() or initializeGL() methods. After a JavaScriptVector is added to a WGLWidget, its jsRef() becomes valid, and can be used in a JSlot, for example.

void Wt::WGLWidget::attachShader ( Program  program,
Shader  shader 
)

GL function to attach a shader to a program.

glAttachShader() OpenGL ES manpage

void Wt::WGLWidget::bindAttribLocation ( Program  program,
unsigned  index,
const std::string &  name 
)

GL function to bind an attribute to a given location.

glBindAttribLocation() OpenGL ES manpage

void Wt::WGLWidget::bindBuffer ( GLenum  target,
Buffer  buffer 
)

GL function to bind a buffer to a target.

glBindBuffer() OpenGL ES manpage

void Wt::WGLWidget::bindFramebuffer ( GLenum  target,
Framebuffer  framebuffer 
)

GL function to bind a frame buffer to a target.

glBindFramebuffer() OpenGL ES manpage

void Wt::WGLWidget::bindRenderbuffer ( GLenum  target,
Renderbuffer  renderbuffer 
)

GL function to bind a render buffer to a target.

glBindRenderbuffer() OpenGL ES manpage

void Wt::WGLWidget::bindTexture ( GLenum  target,
Texture  texture 
)

GL function to bind a texture to a target.

glBindTexture() OpenGL ES manpage

void Wt::WGLWidget::blendColor ( double  red,
double  green,
double  blue,
double  alpha 
)

GL function to set the blending color.

glBlendColor() OpenGL ES manpage

void Wt::WGLWidget::blendEquation ( GLenum  mode)

GL function to set the blending equation.

glBlendEquation() OpenGL ES manpage

void Wt::WGLWidget::blendEquationSeparate ( GLenum  modeRGB,
GLenum  modeAlpha 
)

GL function that sets separate blending functions for RGB and alpha.

glBlendEquationSeparate() OpenGL ES manpage

void Wt::WGLWidget::blendFunc ( GLenum  sfactor,
GLenum  dfactor 
)

GL function to configure the blending function.

glBlendFunc() OpenGL ES manpage

void Wt::WGLWidget::blendFuncSeparate ( GLenum  srcRGB,
GLenum  dstRGB,
GLenum  srcAlpha,
GLenum  dstAlpha 
)

GL function that configures the blending function.

glBlendFuncSeparate() OpenGL ES manpage

void Wt::WGLWidget::bufferData ( GLenum  target,
int  size,
GLenum  usage 
)

glBufferData - create and initialize a buffer object's data store

Set the size of the currently bound WebGLBuffer object for the passed target. The buffer is initialized to 0.

glBufferData() OpenGL ES manpage

void Wt::WGLWidget::bufferData ( GLenum  target,
ArrayBuffer  res,
GLenum  usage 
)

glBufferData - create and initialize a buffer object's data store from an ArrayBuffer

Set the size and contents of the currently bound WebGLBuffer object to be a copy of the given ArrayBuffer.

glBufferData() OpenGL ES manpage

Note: an ArrayBuffer refers to a javascript object, which cannot be used for server-side rendering. If a server-side fallback will be used, then bufferDatafv() should be used with the additional boolean argument to indicate binary transfer of the data in case of client-side rendering.

See Also
createAndLoadArrayBuffer
void Wt::WGLWidget::bufferData ( GLenum  target,
ArrayBuffer  res,
unsigned  arrayBufferOffset,
unsigned  arrayBufferSize,
GLenum  usage 
)

glBufferData - create and initialize a buffer object's data store from an ArrayBuffer

Set the size of the currently bound WebGLBuffer object to arrayBufferSize, and copy the contents of the ArrayBuffer to the buffer, starting at the given offset.

glBufferData() OpenGL ES manpage

Note: not functional for a server-side fall-back (see bufferData(GLenum target, ArrayBuffer res, GLenum usage) for more info)

See Also
createAndLoadArrayBuffer
template<typename Iterator >
void Wt::WGLWidget::bufferDatafv ( GLenum  target,
const Iterator  begin,
const Iterator  end,
GLenum  usage,
bool  binary = false 
)

GL function that loads float or double data in a VBO.

Unlike the C version, we can't accept a void * here. We must be able to interpret the buffer's data in order to transmit it to the JS side.

Later we may also want versions with strides and offsets to cope with more complex buffer layouts that we typically see on desktop WebGL apps; suggestions to improve this are welcome

Note: prefer bufferDatafv(GLenum target, const std::vector<float> &buffer, GLenum usage, bool binary)

glBufferData() OpenGL ES manpage

void Wt::WGLWidget::bufferDatafv ( GLenum  target,
const std::vector< float > &  buffer,
GLenum  usage,
bool  binary = false 
)

GL function that loads float or double data in a VBO.

glBufferData() OpenGL ES manpage

template<typename Iterator >
void Wt::WGLWidget::bufferDataiv ( GLenum  target,
const Iterator  begin,
const Iterator  end,
GLenum  usage,
GLenum  type 
)
void Wt::WGLWidget::bufferDataiv ( GLenum  target,
std::vector< int > &  buffer,
GLenum  usage,
GLenum  type 
)

GL function that updates an existing VBO with new integer data.

glBufferData() OpenGL ES manpage

void Wt::WGLWidget::bufferSubData ( GLenum  target,
unsigned  offset,
ArrayBuffer  res 
)

Initialize a buffer object's data store from an ArrayBuffer.

Load the data of the currently bound WebGLBuffer object from the given ArrayBuffer. The first byte of the resource data will be written at the given offset of the currently bound buffer.

glBufferSubData() OpenGL ES manpage

Note: not functional for a server-side fall-back (see bufferData(GLenum target, ArrayBuffer res, GLenum usage) for more info)

See Also
createAndLoadArrayBuffer
void Wt::WGLWidget::bufferSubData ( GLenum  target,
unsigned  offset,
ArrayBuffer  res,
unsigned  arrayBufferOffset,
unsigned  size 
)

Initialize a buffer object's data store from an ArrayBuffer.

Load the data of the currently bound WebGLBuffer object from the given ArrayBuffer. The byte at position arrayBufferOffset will be written to the currently bound buffer at position offset.

glBufferSubData() OpenGL ES manpage

Note: not functional for a server-side fall-back (see bufferData(GLenum target, ArrayBuffer res, GLenum usage) for more info)

See Also
createAndLoadArrayBuffer
template<typename Iterator >
void Wt::WGLWidget::bufferSubDatafv ( GLenum  target,
unsigned  offset,
const Iterator  begin,
const Iterator  end,
bool  binary = false 
)

GL function that updates an existing VBO with new float or double data.

Note: prefer bufferSubDatafv(GLenum target, unsigned offset, const std::vector<float> &buffer, bool binary)

glBufferSubData() OpenGL ES manpage

void Wt::WGLWidget::bufferSubDatafv ( GLenum  target,
unsigned  offset,
const std::vector< float > &  buffer,
bool  binary = false 
)

GL function that updates an existing VBO with new float data.

glBufferSubData() OpenGL ES manpage

template<typename Iterator >
void Wt::WGLWidget::bufferSubDataiv ( GLenum  target,
unsigned  offset,
const Iterator  begin,
Iterator  end,
GLenum  type 
)

GL function that updates an existing VBO with new integer data.

Note: prefer void bufferSubDataiv(GLenum target, unsigned offset, std::vector<int> &buffer, GLenum type)

glBufferSubData() OpenGL ES manpage

void Wt::WGLWidget::bufferSubDataiv ( GLenum  target,
unsigned  offset,
std::vector< int > &  buffer,
GLenum  type 
)

GL function that loads integer data in a VBO.

glBufferSubData() OpenGL ES manpage

void Wt::WGLWidget::clear ( WFlags< GLenum mask)

GL function that clears the given buffers.

glClear() OpenGL ES manpage

void Wt::WGLWidget::clearBinaryResources ( )

remove all binary buffer resources

Removes all WMemoryResources that were allocated when calling bufferDatafv with binary=true. This is not required, since the resources are also managed, but if you are sure they will not be used anymore in the client, this can help free some memory.

void Wt::WGLWidget::clearColor ( double  r,
double  g,
double  b,
double  a 
)

GL function that sets the clear color of the color buffer.

glClearColor() OpenGL ES manpage

void Wt::WGLWidget::clearDepth ( double  depth)

GL function that configures the depth to be set when the depth buffer is cleared.

glClearDepthf() OpenGL ES manpage

void Wt::WGLWidget::clearStencil ( int  s)
void Wt::WGLWidget::colorMask ( bool  red,
bool  green,
bool  blue,
bool  alpha 
)
void Wt::WGLWidget::compileShader ( Shader  shader)

GL function to compile a shader.

glCompileShader() OpenGL ES manpage

void Wt::WGLWidget::copyTexImage2D ( GLenum  target,
int  level,
GLenum  internalformat,
int  x,
int  y,
unsigned  width,
unsigned  height,
int  border 
)

GL function to copy a texture image.

glCopyTexImage2D() OpenGL ES manpage

void Wt::WGLWidget::copyTexSubImage2D ( GLenum  target,
int  level,
int  xoffset,
int  yoffset,
int  x,
int  y,
unsigned  width,
unsigned  height 
)

GL function that copies a part of a texture image.

glCopyTexSubImage2D() OpenGL ES manpage

WGLWidget::ArrayBuffer Wt::WGLWidget::createAndLoadArrayBuffer ( const std::string &  url)

Function that creates an ArrayBuffer by loading data from a given URL. (deprecated)

The ArrayBuffer is loaded before executing initGL. Use it to load binary data for use in bufferData() or bufferSubData().

Deprecated:
An ArrayBuffer refers to a javascript object, which cannot be used for server-side rendering. The new way to accomplish a binary transfer of buffers is with the added boolean argument in bufferSubDatafv()
WGLWidget::Buffer Wt::WGLWidget::createBuffer ( )

GL function that creates an empty VBO.

glGenBuffers() OpenGL ES manpage

WGLWidget::Framebuffer Wt::WGLWidget::createFramebuffer ( )

GL function that creates a frame buffer object.

glGenFramebuffers() OpenGL ES manpage

WGLWidget::JavaScriptMatrix4x4 Wt::WGLWidget::createJavaScriptMatrix4 ( )

Create a matrix that can be manipulated in client-side JavaScript.

This is a shorthand for creating a JavaScriptMatrix4x4, then adding it to a WGLWidget with addJavaScriptMatrix4, and initializing it with initJavaScriptMatrix4.

This method should only be called in initializeGL(), updateGL() or resizeGL().

WGLWidget::JavaScriptVector Wt::WGLWidget::createJavaScriptVector ( unsigned  length)

Create a vector of a certain length that can be manipulated in client-side JavaScript.

This is a shorthand for creating a JavaScriptVector, then adding it to a WGLWidget with addJavaScriptVector, and initializing it with initJavaScriptVector.

This method should only be called in initializeGL(), updateGL() or resizeGL().

WPaintDevice * Wt::WGLWidget::createPaintDevice ( const WLength width,
const WLength height 
)

returns an paintdevice that can be used to paint a GL texture

If the client has a webGL enabled browser this function returns a WCanvasPaintDevice. If server-side rendering is used as fallback then this function returns a WRasterImage

WGLWidget::Program Wt::WGLWidget::createProgram ( )

GL function that creates an empty program.

glCreateProgram() OpenGL ES manpage

WGLWidget::Renderbuffer Wt::WGLWidget::createRenderbuffer ( )

GL function that creates a render buffer object.

glGenRenderbuffers() OpenGL ES manpage

WGLWidget::Shader Wt::WGLWidget::createShader ( GLenum  shader)

GL function that creates an empty shader.

glCreateShader() OpenGL ES manpage

WGLWidget::Texture Wt::WGLWidget::createTexture ( )

GL function that creates an empty texture.

glGenTextures() OpenGL ES manpage

WGLWidget::Texture Wt::WGLWidget::createTextureAndLoad ( const std::string &  url)

GL function that creates an image texture.

glGenTextures() OpenGL ES manpage

void Wt::WGLWidget::cullFace ( GLenum  mode)

GL function that configures the backface culling mode.

glCullFace() OpenGL ES manpage

void Wt::WGLWidget::deleteBuffer ( Buffer  buffer)

GL function that deletes a VBO.

glDeleteBuffers() OpenGL ES manpage

void Wt::WGLWidget::deleteFramebuffer ( Framebuffer  framebuffer)

GL function that deletes a frame buffer.

glDeleteFramebuffers() OpenGL ES manpage

void Wt::WGLWidget::deleteProgram ( Program  program)

GL function that deletes a program.

glDeleteProgram() OpenGL ES manpage

void Wt::WGLWidget::deleteRenderbuffer ( Renderbuffer  renderbuffer)

GL function that deletes a render buffer.

glDeleteRenderbuffers() OpenGL ES manpage

void Wt::WGLWidget::deleteShader ( Shader  shader)

GL function that depetes a shader.

glDeleteShader() OpenGL ES manpage

void Wt::WGLWidget::deleteTexture ( Texture  texture)

GL function that deletes a texture.

glDeleteTextures() OpenGL ES manpage

void Wt::WGLWidget::depthFunc ( GLenum  func)

GL function to set the depth test function.

glDepthFunc() OpenGL ES manpage

void Wt::WGLWidget::depthMask ( bool  flag)

GL function that enables or disables writing to the depth buffer.

glDepthMask() OpenGL ES manpage

void Wt::WGLWidget::depthRange ( double  zNear,
double  zFar 
)

GL function that specifies to what range the normalized [-1,1] z values should match.

glDepthRangef() OpenGL ES manpage

void Wt::WGLWidget::detachShader ( Program  program,
Shader  shader 
)

GL function that detaches a shader from a program.

glDetachShader() OpenGL ES manpage

void Wt::WGLWidget::disable ( GLenum  cap)

GL function to disable features.

glDisable() OpenGL ES manpage

void Wt::WGLWidget::disableVertexAttribArray ( AttribLocation  index)

GL function to disable the vertex attribute array.

glDisableVertexAttribArray() OpenGL ES manpage

void Wt::WGLWidget::drawArrays ( GLenum  mode,
int  first,
unsigned  count 
)

GL function to draw a VBO.

glDrawArrays() OpenGL ES manpage

void Wt::WGLWidget::drawElements ( GLenum  mode,
unsigned  count,
GLenum  type,
unsigned  offset 
)

GL function to draw indexed VBOs.

glDrawElements() OpenGL ES manpage

void Wt::WGLWidget::enable ( GLenum  cap)

GL function to enable features.

glEnable() OpenGL ES manpage

void Wt::WGLWidget::enableClientErrorChecks ( bool  enable = true)

enable client-side error messages (read detailed doc!)

This option will add client-side code to check the result of every WebGL call, and will popup an error dialog if a WebGL call returned an error. The JavaScript then invokes the client-side debugger. This code is intended to test your application, and should not be used in production.

void Wt::WGLWidget::enableVertexAttribArray ( AttribLocation  index)

GL function to enable the vertex attribute array.

glEnableVertexAttribArray() OpenGL ES manpage

void Wt::WGLWidget::finish ( )

GL function to wait until given commands are executed.

This call is transfered to JS, but the server will never wait on this call.

glFinish() OpenGL ES manpage

void Wt::WGLWidget::flush ( )

GL function to force execution of GL commands in finite time.

glFlush() OpenGL ES manpage

void Wt::WGLWidget::framebufferRenderbuffer ( GLenum  target,
GLenum  attachment,
GLenum  renderbuffertarget,
Renderbuffer  renderbuffer 
)

GL function to attach the given renderbuffer to the currently bound frame buffer.

glFramebufferRenderbuffer() OpenGL ES manpage

void Wt::WGLWidget::framebufferTexture2D ( GLenum  target,
GLenum  attachment,
GLenum  textarget,
Texture  texture,
int  level 
)

GL function to render directly into a texture image.

glFramebufferTexture2D() OpenGL ES manpage

void Wt::WGLWidget::frontFace ( GLenum  mode)

GL function that specifies which side of a triangle is the front side.

glFrontFace() OpenGL ES manpage

void Wt::WGLWidget::generateMipmap ( GLenum  target)

GL function that generates a set of mipmaps for a texture object.

glGenerateMipmap() OpenGL ES manpage

WGLWidget::AttribLocation Wt::WGLWidget::getAttribLocation ( Program  program,
const std::string &  attrib 
)

GL function to retrieve an attribute's location in a Program.

glGetAttribLocation() OpenGL ES manpage

WGLWidget::UniformLocation Wt::WGLWidget::getUniformLocation ( Program  program,
const std::string  location 
)

GL function to retrieve a Uniform's location in a Program.

glGetUniformLocation() OpenGL ES manpage

void Wt::WGLWidget::hint ( GLenum  target,
GLenum  mode 
)

GL function to give hints to the render pipeline.

glHint() OpenGL ES manpage

void Wt::WGLWidget::initializeGL ( )
protectedvirtual

Initialize the GL state when the widget is first shown.

initializeGL() is called when the widget is first rendered, and when the webglcontextrestored signal is fired. You can distinguish between the first initialization and context restoration using restoringContext(). It usually creates most of the GL related state: shaders, VBOs, uniform locations, ...

If this state is to be updated during the lifetime of the widget, you should specialize the updateGL() to accomodate for this.

Reimplemented in Wt::Chart::WCartesian3DChart.

void Wt::WGLWidget::initJavaScriptMatrix4 ( JavaScriptMatrix4x4 m)

Initialize the client-side JavaScript for the given JavaScriptMatrix4x4.

If the given matrix is not associated with a widget yet, it will be added to this widget.

If the given matrix has already been added to a WGLWidget, then this WGLWidget should be the same as the one you call initJavaScriptMatrix4 on.

This method should only be called in initializeGL(), updateGL() or resizeGL().

void Wt::WGLWidget::initJavaScriptVector ( JavaScriptVector v)

Initialize the client-side JavaScript for the given JavaScriptVector.

If the given vector is not associated with a widget yet, it will be added to this widget.

If the given vector has already been added to a WGLWidget, then this WGLWidget should be the same as the one you call initJavaScriptVector on.

This method should only be called in initializeGL(), updateGL() or resizeGL().

void Wt::WGLWidget::injectJS ( const std::string &  jsString)

Inject JavaScript into the current js-stream.

Careful: this method directly puts the given jsString into the JavaScript stream, whatever state it current has. For example, if called in initGL(), it will put the jsString into the client-side initGL() code.

void Wt::WGLWidget::layoutSizeChanged ( int  width,
int  height 
)
protectedvirtual

Virtual method that indicates a size change.

This method propagates the client-side width and height of the widget when the widget is contained by a layout manager and setLayoutSizeAware(true) was called.

See Also
setLayoutSizeAware()

Reimplemented from Wt::WWidget.

void Wt::WGLWidget::lineWidth ( double  width)

GL function to set the line width.

glLineWidth() OpenGL ES manpage

void Wt::WGLWidget::linkProgram ( Program  program)

GL function to link a program.

glLinkProgram() OpenGL ES manpage

void Wt::WGLWidget::paintGL ( )
protectedvirtual

Update the client-side painting function.

This method is invoked client-side when a repaint is required, i.e. when the repaintSlot() (a JavaScript-side JSlot) is triggered. Typical examples are: after mouse-based camera movements, after a timed update of a camera or an object's position, after a resize event (resizeGL() will also be called then), after an animation event, ... In many cases, this function will be executed client-side many many times.

Using the GL functions from this class, you construct a scene. The implementation tracks all JavaScript calls that need to be performed to draw the scenes, and will replay them verbatim on every trigger of the repaintSlot(). There are a few mechanisms that may be employed to change what is rendered without updating the paintGL() cache:

  • Client-side matrices may be used to change camera viewpoints, manipilate separate object's model transformation matrices, ...
  • Shader sources can be updated without requiring the paint function to be renewed

Updating the paintGL() cache is usually not too expensive; the VBOs, which are large in many cases, are already at the client side, while the paintGL() code only draws the VBOs. Of course, if you have to draw many separate objects, the paintGL() JS code may become large and updating is more expensive.

In order to update the paintGL() cache, call repaintGL() with the PAINT_GL parameter, which will cause the invocation of this method.

Reimplemented in Wt::Chart::WCartesian3DChart.

void Wt::WGLWidget::pixelStorei ( GLenum  pname,
int  param 
)

GL function to set the pixel storage mode.

glPixelStorei() OpenGL ES manpage

void Wt::WGLWidget::polygonOffset ( double  factor,
double  units 
)

GL function to apply modifications to Z values.

glPolygonOffset() OpenGL ES manpage

void Wt::WGLWidget::render ( WFlags< RenderFlag flags)
protectedvirtual

Renders the widget.

This function renders the widget (or an update for the widget), after this has been scheduled using scheduleRender().

The default implementation will render the widget by serializing changes to JavaScript and HTML. You may want to reimplement this widget if you have been postponing some of the layout / rendering implementation until the latest moment possible. In that case you should make sure you call the base implementation however.

Reimplemented from Wt::WWebWidget.

void Wt::WGLWidget::renderbufferStorage ( GLenum  target,
GLenum  internalformat,
unsigned  width,
unsigned  height 
)

GL function to allocate the appropriate amount of memory for a render buffer.

glSampleCoverage() OpenGL ES manpage

void Wt::WGLWidget::repaintGL ( WFlags< ClientSideRenderer which)

Request invocation of resizeGL, paintGL and/or updateGL.

If invoked with PAINT_GL, the client-side cached paint function is updated. If invoked with RESIZE_GL or UPDATE_GL, the code will be executed once.

If invoked with multiple flags set, the order of execution will be updateGL(), resizeGL(), paintGL().

JSlot& Wt::WGLWidget::repaintSlot ( )

A JavaScript slot that repaints the widget when triggered.

This is useful for client-side initiated repaints. You may e.g. use this if you write your own client-side mouse handler, or if you updated a texture, or if you're playing a video texture.

void Wt::WGLWidget::resize ( const WLength width,
const WLength height 
)
virtual

Resizes the widget.

Specifies a fixed size for this widget, setting CSS width and height properties. By default a widget has automatic width and height, which sets a size for the widget following CSS rules.

When the widget is not managed by a layout manager, the automatic (natural) size of a widget depends on whether they widget is a block or inline widget:

  • a block widget takes by default the width of the parent, and the height that it needs based on its contents
  • an inline widget takes the width and height that it needs based on its contents (possibly wrapping over multiple lines). The width and height of an inline widget cannot be changed (by the letter of CSS, although most browsers will react to it in varying ways).

When inserted in a layout manager, the size set will be used as a widget's preferred size, but the widget may be given a different size by the layout manager based on available space and stretch factors. The actual size given by a layout manager may be retrieved by making the widget "layout size aware", using setLayoutSizeAware(). If you have defined a "wtResize()" JavaScript method for the widget, then this method will also be called.

The default width and height of a widget is WLength::Auto.

See Also
width(), height()

Reimplemented from Wt::WWebWidget.

void Wt::WGLWidget::resizeGL ( int  width,
int  height 
)
protectedvirtual

Act on resize events.

Usually, this method only contains functions to set the viewport and the projection matrix (as this is aspect ration dependent).

resizeGL() is rendered after initializeGL, and whenever widget is resized. After this method finishes, the widget is repainted with the cached client-side paint function.

Reimplemented in Wt::Chart::WCartesian3DChart.

bool Wt::WGLWidget::restoringContext ( ) const

Returns whether a lost context is in the process of being restored.

You can check for this in initializeGL(), to handle the first initialization and restoration of context differently.

void Wt::WGLWidget::sampleCoverage ( double  value,
bool  invert 
)

GL function to set multisample parameters.

glSampleCoverage() OpenGL ES manpage

void Wt::WGLWidget::scissor ( int  x,
int  y,
unsigned  width,
unsigned  height 
)

GL function to define the scissor box.

glScissor() OpenGL ES manpage

void Wt::WGLWidget::setAlternativeContent ( WWidget alternative)

Sets the content to be displayed when WebGL is not available.

If Wt cannot create a working WebGL context, this content will be shown to the user. This may be a text explanation, or a pre-rendered image, or a video, a flash movie, ...

The default is a widget that explains to the user that he has no WebGL support.

void Wt::WGLWidget::setClientSideLookAtHandler ( const JavaScriptMatrix4x4 m,
double  lX,
double  lY,
double  lZ,
double  uX,
double  uY,
double  uZ,
double  pitchRate,
double  yawRate 
)

Add a mouse handler to the widget that looks at a given point.

This will allow a user to change client-side matrix m with the mouse. M is a model transformation matrix, representing the viewpoint of the camera.

Through mouse operations, the camera can be changed by the user, but (lX, lY, lZ) will always be at the center of the display, (uX, uY, uZ) is considered to be the up direction, and the distance of the camera to (lX, lY, lZ) will never change.

Pressing the left mouse button and moving the mouse left/right will rotate the camera around the up (uX, uY, uZ) direction. Moving up/down will tilt the camera (causing it to move up/down to keep the lookpoint centered). The scroll wheel simulates zooming by scaling the scene.

pitchRate and yawRate control how much the camera will move per mouse pixel.

Usually this method is called after setting a camera transformation with a client-side matrix in initializeGL(). However, this function may also be called from outside the intializeGL()/paintGL()/updateGL() methods (but not before m was initialized).

void Wt::WGLWidget::setClientSideMouseHandler ( const std::string &  handlerCode)

Set a custom mouse handler based on the given JavaScript code.

The handler code should be JavaScript code that produces an object when evaluated.

A mouse handler is an object that can implement one or more of the following functions:

  • setTarget(target): This is called immediately when the mouse handler is added with an object that uniquely identifies the WGLWidget, and a paintGL() method.
  • mouseDown(o, event): To handle the mousedown event. o is the <canvas> (client-side rendering) or <img> (server-side rendering) element corresponding to this WGLWidget. event is the MouseEvent.
  • mouseUp(o, event): To handle the mouseup event. o is the <canvas> (client-side rendering) or <img> (server-side rendering) element corresponding to this WGLWidget. event is the MouseEvent.
  • mouseDrag(o, event): Called when the mouse is dragged. o is the <canvas> (client-side rendering) or <img> (server-side rendering) element corresponding to this WGLWidget. event is the MouseEvent.
  • mouseWheel(o, event): Called when the mouse wheel is used. o is the <canvas> (client-side rendering) or <img> (server-side rendering) element corresponding to this WGLWidget. event is the MouseEvent.
  • touchStart(o, event): To handle the touchstart event. o is the <canvas> (client-side rendering) or <img> (server-side rendering) element corresponding to this WGLWidget. event is the TouchEvent.
  • touchEnd(o, event): To handle the touchend event. o is this <canvas> (client-side rendering) or <img> (server-side rendering) element corresponding to this WGLWidget. event is the TouchEvent.
  • touchMoved(o, event): To handle the touchmove event. o is this <canvas> (client-side rendering) or <img> (server-side rendering) element corresponding to this WGLWidget. event is the TouchEvent.

    Example: If the variable mouseHandler contains the following JavaScript, and uses the glMatrix library:

    function(cameraMatrix) {
    var target = null;
    this.setTarget = function(newTarget) {
    target = newTarget;
    };
    this.mouseWheel = function(o, event) {
    var fix = jQuery.event.fix(event);
    fix.preventDefault();
    fix.stopPropagation();
    var d = wheelDelta(event);
    var s = Math.pow(1.2, delta);
    mat4.scale(cameraMatrix, cameraMatrix, [s, s, s]);
    target.paintGL();
    };
    function wheelDelta(e) {
    var delta = 0;
    if (e.wheelDelta) {
    delta = e.wheelDelta > 0 ? 1 : -1;
    } else if (e.detail) {
    delta = e.detail < 0 ? 1 : -1;
    }
    return delta;
    }
    }

    This mouse handler can be set as such:

    setClientSideMouseHandler("new " + mouseHandler + "(" + cameraMatrix.jsRef() + ")");

    where mouseHandler is the code of the mouse handler, and cameraMatrix is a WGLWidget::JavaScriptMatrix4x4.

void Wt::WGLWidget::setClientSideWalkHandler ( const JavaScriptMatrix4x4 m,
double  frontStep,
double  rotStep 
)

Add a mouse handler to the widget that allows 'walking' in the scene.

This will allow a user to change client-side matrix m with the mouse. M is a model transformation matrix, representing the viewpoint of the camera.

Through mouse operations, the camera can be changed by the user, as if he is walking around on a plane.

Pressing the left mouse button and moving the mouse left/right will rotate the camera around Y axis. Moving the mouse up/down will move the camera in the Z direction (walking forward/backward). centered).

frontStep and rotStep control how much the camera will move per mouse pixel.

template<typename MatrixType >
void Wt::WGLWidget::setJavaScriptMatrix4 ( JavaScriptMatrix4x4 jsm,
const WGenericMatrix< MatrixType, 4, 4 > &  m 
)

Set the value of a client-side JavaScript matrix created by createJavaScriptMatrix4x4()

This method should only be called in initializeGL(), updateGL() or resizeGL().

void Wt::WGLWidget::setJavaScriptVector ( JavaScriptVector jsv,
const std::vector< float > &  v 
)

Set the value of a client-side JavaScript vector created by createJavaScriptVector()

This method should only be called in initializeGL(), updateGL() or resizeGL().

void Wt::WGLWidget::setRenderOptions ( WFlags< RenderOption options)

Sets the rendering option.

Use this method to configure whether client-side and/or server-side rendering can be used, and whether anti-aliasing should be enabled. The actual choice is also based on availability (respectively client-side or server-side).

The default value is to try both ClientSide or ServerSide rendering, and to enable anti-aliasing if available.

Note
Options must be set before the widget is being rendered.
void Wt::WGLWidget::shaderSource ( Shader  shader,
const std::string &  src 
)

GL function to set a shader's source code.

glShaderSource() OpenGL ES manpage

void Wt::WGLWidget::stencilFunc ( GLenum  func,
int  ref,
unsigned  mask 
)

GL function to set stencil test parameters.

glStencilFunc() OpenGL ES manpage

void Wt::WGLWidget::stencilFuncSeparate ( GLenum  face,
GLenum  func,
int  ref,
unsigned  mask 
)

GL function to set stencil test parameters for front and/or back stencils.

glStencilFuncSeparate() OpenGL ES manpage

void Wt::WGLWidget::stencilMask ( unsigned  mask)

GL function to control which bits are to be written in the stencil buffer.

glStencilMask() OpenGL ES manpage

void Wt::WGLWidget::stencilMaskSeparate ( GLenum  face,
unsigned  mask 
)

GL function to control which bits are written to the front and/or back stencil buffers.

glStencilMaskSeparate() OpenGL ES manpage

void Wt::WGLWidget::stencilOp ( GLenum  fail,
GLenum  zfail,
GLenum  zpass 
)

GL function to set stencil test actions.

glStencilOp() OpenGL ES manpage

void Wt::WGLWidget::stencilOpSeparate ( GLenum  face,
GLenum  fail,
GLenum  zfail,
GLenum  zpass 
)

GL function to set front and/or back stencil test actions separately.

glStencilOpSeparate() OpenGL ES manpage

void Wt::WGLWidget::texImage2D ( GLenum  target,
int  level,
GLenum  internalformat,
unsigned  width,
unsigned  height,
int  border,
GLenum  format 
)

GL function to reserve space for a 2D texture, without specifying its contents.

This corresponds to calling the WebGL function void texImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, ArrayBufferView pixels) with null as last parameters. The value of 'type' is then of no importance and is therefore omitted from this function.

glTexImage2D() OpenGL ES manpage

void Wt::WGLWidget::texImage2D ( GLenum  target,
int  level,
GLenum  internalformat,
GLenum  format,
GLenum  type,
WImage image 
)

GL function to load a 2D texture from a WImage.

Note: WImage must be loaded before this function is executed.

glTexImage2D() OpenGL ES manpage

void Wt::WGLWidget::texImage2D ( GLenum  target,
int  level,
GLenum  internalformat,
GLenum  format,
GLenum  type,
WVideo video 
)

GL function to load a 2D texture from a WVideo.

Note: the video must be loaded prior to calling this function. The current frame is used as texture image.

glTexImage2D() OpenGL ES manpage

void Wt::WGLWidget::texImage2D ( GLenum  target,
int  level,
GLenum  internalformat,
GLenum  format,
GLenum  type,
std::string  filename 
)

GL function to load a 2D texture from a file.

glTexImage2D() OpenGL ES manpage

void Wt::WGLWidget::texImage2D ( GLenum  target,
int  level,
GLenum  internalformat,
GLenum  format,
GLenum  type,
WPaintDevice paintdevice 
)

GL function to load a 2D texture from a WPaintDevice.

glTexImage2D() OpenGL ES manpage

See Also
createPaintDevice()
void Wt::WGLWidget::texImage2D ( GLenum  target,
int  level,
GLenum  internalformat,
GLenum  format,
GLenum  type,
Texture  texture 
)

GL function to load a 2D texture loaded with createTextureAndLoad()

This function must only be used for textures created with createTextureAndLoad()

Note: the WGLWidget implementation will delay rendering until all textures created with createTextureAndLoad() are loaded in the browser.

glTexImage2D() OpenGL ES manpage

void Wt::WGLWidget::texParameteri ( GLenum  target,
GLenum  pname,
GLenum  param 
)

GL function to set texture parameters.

glTexParameter() OpenGL ES manpage

void Wt::WGLWidget::uniform1f ( const UniformLocation location,
double  x 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

template<typename FloatArray >
void Wt::WGLWidget::uniform1fv ( const UniformLocation location,
const FloatArray *  value 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform1fv ( const UniformLocation location,
const JavaScriptVector v 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform1i ( const UniformLocation location,
int  x 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

template<typename IntArray >
void Wt::WGLWidget::uniform1iv ( const UniformLocation location,
const IntArray *  value 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform2f ( const UniformLocation location,
double  x,
double  y 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

template<typename FloatArray >
void Wt::WGLWidget::uniform2fv ( const UniformLocation location,
const FloatArray *  value 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform2fv ( const UniformLocation location,
const JavaScriptVector v 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform2i ( const UniformLocation location,
int  x,
int  y 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

template<typename IntArray >
void Wt::WGLWidget::uniform2iv ( const UniformLocation location,
const IntArray *  value 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform3f ( const UniformLocation location,
double  x,
double  y,
double  z 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

template<typename FloatArray >
void Wt::WGLWidget::uniform3fv ( const UniformLocation location,
const FloatArray *  value 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform3fv ( const UniformLocation location,
const JavaScriptVector v 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform3i ( const UniformLocation location,
int  x,
int  y,
int  z 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

template<typename IntArray >
void Wt::WGLWidget::uniform3iv ( const UniformLocation location,
const IntArray *  value 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform4f ( const UniformLocation location,
double  x,
double  y,
double  z,
double  w 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

template<typename FloatArray >
void Wt::WGLWidget::uniform4fv ( const UniformLocation location,
const FloatArray *  value 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform4fv ( const UniformLocation location,
const JavaScriptVector v 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniform4i ( const UniformLocation location,
int  x,
int  y,
int  z,
int  w 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

template<typename IntArray >
void Wt::WGLWidget::uniform4iv ( const UniformLocation location,
const IntArray *  value 
)

GL function to set the value of a uniform variable of the current program.

glUniform() OpenGL ES manpage

template<typename MatrixType >
void Wt::WGLWidget::uniformMatrix2 ( const UniformLocation location,
const WGenericMatrix< MatrixType, 2, 2 > &  m 
)

GL function to set the value of a uniform matrix of the current program.

This function renders the matrix in the proper row/column order.

glUniform() OpenGL ES manpage

template<typename MatrixType >
void Wt::WGLWidget::uniformMatrix2fv ( const UniformLocation location,
bool  transpose,
const MatrixType *  value 
)

GL function to set the value of a uniform matrix of the current program.

Attention: The OpenGL ES specification states that transpose MUST be false.

glUniform() OpenGL ES manpage

template<typename MatrixType >
void Wt::WGLWidget::uniformMatrix3 ( const UniformLocation location,
const WGenericMatrix< MatrixType, 3, 3 > &  m 
)

GL function to set the value of a uniform matrix of the current program.

This function renders the matrix in the proper row/column order.

glUniform() OpenGL ES manpage

template<typename MatrixType >
void Wt::WGLWidget::uniformMatrix3fv ( const UniformLocation location,
bool  transpose,
const MatrixType *  value 
)

GL function to set the value of a uniform matrix of the current program.

Attention: The OpenGL ES specification states that transpose MUST be false.

glUniform() OpenGL ES manpage

template<typename MatrixType >
void Wt::WGLWidget::uniformMatrix4 ( const UniformLocation location,
const WGenericMatrix< MatrixType, 4, 4 > &  m 
)

GL function to set the value of a uniform matrix of the current program.

This function renders the matrix in the proper row/column order.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::uniformMatrix4 ( const UniformLocation location,
const JavaScriptMatrix4x4 m 
)

GL function to set the value of a uniform matrix of the current program.

glUniform() OpenGL ES manpage

template<typename MatrixType >
void Wt::WGLWidget::uniformMatrix4fv ( const UniformLocation location,
bool  transpose,
const MatrixType *  value 
)

GL function to set the value of a uniform matrix of the current program.

Attention: The OpenGL ES specification states that transpose MUST be false.

glUniform() OpenGL ES manpage

void Wt::WGLWidget::updateGL ( )
protectedvirtual

Update state set in initializeGL()

Invoked when repaint is called with the UPDATE_GL call.

This is intended to be executed when you want to change programs, 'constant' uniforms, or even VBO's, ... without resending already initialized data. It is a mechanism to make changes to what you've set in intializeGL(). For every server-side invocation of this method, the result will be rendered client-side exactly once.

Reimplemented in Wt::Chart::WCartesian3DChart.

void Wt::WGLWidget::useProgram ( Program  program)

GL function to set the current active shader program.

glUseProgram() OpenGL ES manpage

void Wt::WGLWidget::validateProgram ( Program  program)

GL function to validate a program.

implementation note: there is currently not yet a method to read out the validation result.

glValidateProgram() OpenGL ES manpage

void Wt::WGLWidget::vertexAttrib1f ( AttribLocation  location,
double  x 
)

GL function to set the value of an attribute of the current program.

glVertexAttrib() OpenGL ES manpage

template<typename FloatArray >
void Wt::WGLWidget::vertexAttrib1fv ( AttribLocation  location,
const FloatArray *  values 
)

GL function to set the value of an attribute of the current program.

glVertexAttrib() OpenGL ES manpage

void Wt::WGLWidget::vertexAttrib2f ( AttribLocation  location,
double  x,
double  y 
)

GL function to set the value of an attribute of the current program.

glVertexAttrib() OpenGL ES manpage

template<typename FloatArray >
void Wt::WGLWidget::vertexAttrib2fv ( AttribLocation  location,
const FloatArray *  values 
)

GL function to set the value of an attribute of the current program.

glVertexAttrib() OpenGL ES manpage

void Wt::WGLWidget::vertexAttrib3f ( AttribLocation  location,
double  x,
double  y,
double  z 
)

GL function to set the value of an attribute of the current program.

glVertexAttrib() OpenGL ES manpage

template<typename FloatArray >
void Wt::WGLWidget::vertexAttrib3fv ( AttribLocation  location,
const FloatArray *  values 
)

GL function to set the value of an attribute of the current program.

glVertexAttrib() OpenGL ES manpage

void Wt::WGLWidget::vertexAttrib4f ( AttribLocation  location,
double  x,
double  y,
double  z,
double  w 
)

GL function to set the value of an attribute of the current program.

glVertexAttrib() OpenGL ES manpage

template<typename FloatArray >
void Wt::WGLWidget::vertexAttrib4fv ( AttribLocation  location,
const FloatArray *  values 
)

GL function to set the value of an attribute of the current program.

glVertexAttrib() OpenGL ES manpage

void Wt::WGLWidget::vertexAttribPointer ( AttribLocation  location,
int  size,
GLenum  type,
bool  normalized,
unsigned  stride,
unsigned  offset 
)

GL function to bind a VBO to an attribute.

This function links the given attribute to the VBO currently bound to the ARRAY_BUFFER target.

The size parameter specifies the number of components per attribute (1 to 4). The type parameter is also used to determine the size of each component.

The size of a float is 8 bytes.

In WGLWidget, the size of an int is 4 bytes.

The stride is in bytes.

The maximum stride is 255.

glVertexAttribPointer() OpenGL ES manpage

void Wt::WGLWidget::viewport ( int  x,
int  y,
unsigned  width,
unsigned  height 
)

GL function to set the viewport.

glViewport() OpenGL ES manpage


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