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QGLFramebufferObjectFormat

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QGLPixelBuffer

QGLPixelBuffer class encapsulates an OpenGL pbuffer. 更多 …

Inheritance diagram of PySide2.QtOpenGL.QGLPixelBuffer

概要

函数

静态函数

详细描述

Rendering into a pbuffer is normally done using full hardware acceleration. This can be significantly faster than rendering into a QPixmap .

There are three approaches to using this class:

  1. We can draw into the pbuffer and convert it to a QImage 使用 toImage() . This is normally much faster than calling renderPixmap() .

  2. We can draw into the pbuffer and copy the contents into an OpenGL texture using updateDynamicTexture() . This allows us to create dynamic textures and works on all systems with pbuffer support.

  3. On systems that support it, we can bind the pbuffer to an OpenGL texture. The texture is then updated automatically when the pbuffer contents change, eliminating the need for additional copy operations. This is supported only on Windows and macOS systems that provide the render_texture extension. Note that under Windows, a multi-sampled pbuffer can’t be used in conjunction with the render_texture extension. If a multi-sampled pbuffer is requested under Windows, the render_texture extension is turned off for that pbuffer.

注意

This class has been deprecated, use QOpenGLFramebufferObject for offscreen rendering.

线程

As of Qt 4.8, it’s possible to render into a QGLPixelBuffer 使用 QPainter in a separate thread. Note that OpenGL 2.0 or OpenGL ES 2.0 is required for this to work.

Pbuffers are provided by the OpenGL pbuffer extension; call hasOpenGLPbuffer() to find out if the system provides pbuffers.

class QGLPixelBuffer ( size [ , format=QGLFormat.defaultFormat() [ , shareWidget=None ] ] )

QGLPixelBuffer(width, height[, format=QGLFormat.defaultFormat()[, shareWidget=None]])

param format

QGLFormat

param size

QSize

param shareWidget

QGLWidget

param width

int

param height

int

Constructs an OpenGL pbuffer of the given size . If no format is specified, the default format is used. If the shareWidget parameter points to a valid QGLWidget , the pbuffer will share its context with shareWidget .

If you intend to bind this pbuffer as a dynamic texture, the width and height components of size must be powers of two (e.g., 512 x 128).

另请参阅

size() format()

这是重载函数。

Constructs an OpenGL pbuffer with the width and height . If no format is specified, the default format is used. If the shareWidget parameter points to a valid QGLWidget , the pbuffer will share its context with shareWidget .

If you intend to bind this pbuffer as a dynamic texture, the width and height components of size must be powers of two (e.g., 512 x 128).

另请参阅

size() format()

PySide2.QtOpenGL.QGLPixelBuffer. bindTexture ( pixmap [ , target=GL_TEXTURE_2D ] )
参数

  • pixmap – QPixmap

  • target – GLenum

返回类型

GLuint

PySide2.QtOpenGL.QGLPixelBuffer. bindTexture ( fileName )
参数

fileName – unicode

返回类型

GLuint

这是重载函数。

Reads the DirectDrawSurface (DDS) compressed file fileName and generates a 2D GL texture from it.

相当于调用 bindTexture() .

另请参阅

deleteTexture()

PySide2.QtOpenGL.QGLPixelBuffer. bindTexture ( image [ , target=GL_TEXTURE_2D ] )
参数

  • image – QImage

  • target – GLenum

返回类型

GLuint

PySide2.QtOpenGL.QGLPixelBuffer. bindToDynamicTexture ( texture )
参数

texture – GLuint

返回类型

bool

Binds the texture specified by texture_id to this pbuffer. Returns true 当成功时；否则返回 false .

The texture must be of the same size and format as the pbuffer.

To unbind the texture, call releaseFromDynamicTexture() . While the texture is bound, it is updated automatically when the pbuffer contents change, eliminating the need for additional copy operations.

范例： 

pbuffer QGLPixelBuffer(...)
...
pbuffer.makeCurrent()
dynamicTexture = pbuffer.generateDynamicTexture()
pbuffer.bindToDynamicTexture(dynamicTexture)
...
pbuffer.releaseFromDynamicTexture()

警告

This function uses the render_texture extension, which is currently not supported under X11. An alternative that works on all systems (including X11) is to manually copy the pbuffer contents to a texture using updateDynamicTexture() .

警告

For the call to succeed on the macOS, the pbuffer needs a shared context, i.e. the QGLPixelBuffer must be created with a share widget.

另请参阅

generateDynamicTexture() releaseFromDynamicTexture()

PySide2.QtOpenGL.QGLPixelBuffer. context ( )
返回类型

QGLContext

Returns the context of this pixelbuffer.

PySide2.QtOpenGL.QGLPixelBuffer. deleteTexture ( texture_id )
参数

texture_id – GLuint

Removes the texture identified by texture_id from the texture cache.

相当于调用 deleteTexture() .

PySide2.QtOpenGL.QGLPixelBuffer. doneCurrent ( )
返回类型

bool

Makes no context the current OpenGL context. Returns true 当成功时；否则返回 false .

PySide2.QtOpenGL.QGLPixelBuffer. drawTexture ( point , textureId [ , textureTarget=GL_TEXTURE_2D ] )
参数

  • point – QPointF

  • textureId – GLuint

  • textureTarget – GLenum

PySide2.QtOpenGL.QGLPixelBuffer. drawTexture ( target , textureId [ , textureTarget=GL_TEXTURE_2D ] )
参数

  • target – QRectF

  • textureId – GLuint

  • textureTarget – GLenum

PySide2.QtOpenGL.QGLPixelBuffer. format ( )
返回类型

QGLFormat

Returns the format of the pbuffer. The format may be different from the one that was requested.

PySide2.QtOpenGL.QGLPixelBuffer. generateDynamicTexture ( )
返回类型

GLuint

Generates and binds a 2D GL texture that is the same size as the pbuffer, and returns the texture’s ID. This can be used in conjunction with bindToDynamicTexture() and updateDynamicTexture() .

另请参阅

size()

PySide2.QtOpenGL.QGLPixelBuffer. handle ( )
返回类型

Qt::HANDLE

Returns the native pbuffer handle.

static PySide2.QtOpenGL.QGLPixelBuffer. hasOpenGLPbuffers ( )
返回类型

bool

返回 true if the OpenGL pbuffer extension is present on this system; otherwise returns false .

PySide2.QtOpenGL.QGLPixelBuffer. isValid ( )
返回类型

bool

返回 true if this pbuffer is valid; otherwise returns false .

PySide2.QtOpenGL.QGLPixelBuffer. makeCurrent ( )
返回类型

bool

Makes this pbuffer the current OpenGL rendering context. Returns true on success; otherwise returns false .

另请参阅

makeCurrent() doneCurrent()

PySide2.QtOpenGL.QGLPixelBuffer. releaseFromDynamicTexture ( )

Releases the pbuffer from any previously bound texture.

另请参阅

bindToDynamicTexture()

PySide2.QtOpenGL.QGLPixelBuffer. size ( )
返回类型

QSize

Returns the size of the pbuffer.

PySide2.QtOpenGL.QGLPixelBuffer. toImage ( )
返回类型

QImage

Returns the contents of the pbuffer as a QImage .

PySide2.QtOpenGL.QGLPixelBuffer. updateDynamicTexture ( texture_id )
参数

texture_id – GLuint

Copies the pbuffer contents into the texture specified with texture_id .

The texture must be of the same size and format as the pbuffer.

范例： 

pbuffer QGLPixelBuffer(...)
...
pbuffer.makeCurrent()
dynamicTexture = pbuffer.generateDynamicTexture()
...
pbuffer.updateDynamicTexture(dynamicTexture)

An alternative on Windows and macOS systems that support the render_texture extension is to use bindToDynamicTexture() to get dynamic updates of the texture.

另请参阅

generateDynamicTexture() bindToDynamicTexture()