C language function:glGetTexImage sample codes

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TITLE : Best Practices for Working with Texture Data
glGetTexImage(GL_TEXTURE_RECTANGLE_ARB, 0, GL_BGRA,.......
http://developer.apple.com/library/content/documentation/GraphicsImaging/Conceptual/OpenGL-MacProgGuide/opengl_texturedata/opengl_texturedata.html


TITLE : QOpenGLFunctions_3_1 Class | Qt GUI 5.9
void glGetTexImage(GLenum target, GLint level, GLenum format, GLenum type, GLvoid *pixels).......
http://doc.qt.io/qt-5/qopenglfunctions-3-1.html
TITLE : QOpenGLFunctions_3_1 Class | Qt GUI 5.9
void QOpenGLFunctions_3_1::glGetTexImage(GLenum target, GLint level, GLenum format, GLenum type, GLvoid *pixels).......
http://doc.qt.io/qt-5/qopenglfunctions-3-1.html
TITLE : glGetTexImage - OpenGL 4 - docs.gl
void glGetTexImage( GLenum target,.......
http://docs.gl/gl4/glGetTexImage
TITLE : glGetTexImage - OpenGL 4 - docs.gl
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGB, GL_FLOAT, texture_data);.......
http://docs.gl/gl4/glGetTexImage
TITLE : GL2GL3 (JOGL, NativeWindow and NEWT APIs)
void glGetTexImage(int target, int level, int format, int type, Buffer pixels).......
http://download.java.net/media/jogl/jogl-2.x-docs/javax/media/opengl/GL2GL3.html
TITLE : GL2GL3 (JOGL, NativeWindow and NEWT APIs)
Entry point to C language function: void glGetTexImage(GLenum target, GLint level, GLenum format, GLenum type, GLvoid * pixels);.......
http://download.java.net/media/jogl/jogl-2.x-docs/javax/media/opengl/GL2GL3.html
TITLE : GL2GL3 (JOGL, NativeWindow and NEWT APIs)
void glGetTexImage(int target, int level, int format, int type, long pixels_buffer_offset).......
http://download.java.net/media/jogl/jogl-2.x-docs/javax/media/opengl/GL2GL3.html
TITLE : GL2GL3 (JOGL, NativeWindow and NEWT APIs)
Entry point to C language function: void glGetTexImage(GLenum target, GLint level, GLenum format, GLenum type, GLvoid * pixels);.......
http://download.java.net/media/jogl/jogl-2.x-docs/javax/media/opengl/GL2GL3.html
TITLE : GL2GL3 (JOGL, NativeWindow and NEWT APIs)
void glGetTexImage(int target,.......
http://download.java.net/media/jogl/jogl-2.x-docs/javax/media/opengl/GL2GL3.html
TITLE : GL2GL3 (JOGL, NativeWindow and NEWT APIs)
Entry point to C language function: void glGetTexImage(GLenum target, GLint level, GLenum format, GLenum type, GLvoid * pixels);.......
http://download.java.net/media/jogl/jogl-2.x-docs/javax/media/opengl/GL2GL3.html
TITLE : GL2GL3 (JOGL, NativeWindow and NEWT APIs)
void glGetTexImage(int target,.......
http://download.java.net/media/jogl/jogl-2.x-docs/javax/media/opengl/GL2GL3.html
TITLE : GL2GL3 (JOGL, NativeWindow and NEWT APIs)
Entry point to C language function: void glGetTexImage(GLenum target, GLint level, GLenum format, GLenum type, GLvoid * pixels);.......
http://download.java.net/media/jogl/jogl-2.x-docs/javax/media/opengl/GL2GL3.html
TITLE : OpenSceneGraph Forum :: View topic - Confused with pixel buffer objects in OSG
glGetTexImage(trect_->getTextureTarget(),.......
http://forum.openscenegraph.org/viewtopic.php@t=7251
TITLE : OpenGL : sluggish performance in extracting texture from GPU - Game Development Stack Exchange
For this operation, i'm using glGetTexImage(). It works, but the performance is sluggish. No, i mean even slower than that. For example, an 8MB texture (uncompressed) requires 3 seconds (yes, seconds) to be extracted. That's mind puzzling. I'm almost wondering if my graphic card is connected by a serial link..........
http://gamedev.stackexchange.com/questions/44783/opengl-sluggish-performance-in-extracting-texture-from-gpu
TITLE : OpenGL : sluggish performance in extracting texture from GPU - Game Development Stack Exchange
Edit : by moving the call to glGetTexImage() in a different place, the speed has been a bit improved for the most dramatic samples : looking again at the 8MB texture, it knows requires 500ms, instead of 3sec. It's better, but still much too slow. Smaller texture sizes were not affected by the change (typical timing remained into the 60-80ms range)........
http://gamedev.stackexchange.com/questions/44783/opengl-sluggish-performance-in-extracting-texture-from-gpu
TITLE : OpenGL : sluggish performance in extracting texture from GPU - Game Development Stack Exchange
The timing is measured for the full rendering + saving sequence. The call to glGetTexImage() alone does not really matter. That being said, it is this call which changes the performance........
http://gamedev.stackexchange.com/questions/44783/opengl-sluggish-performance-in-extracting-texture-from-gpu
TITLE : OpenGL : sluggish performance in extracting texture from GPU - Game Development Stack Exchange
Edit 2 : I've also tried to use glReadPixels(), instead of glGetTexImage(). But it's worse unfortunately. Approximately twice slower........
http://gamedev.stackexchange.com/questions/44783/opengl-sluggish-performance-in-extracting-texture-from-gpu
TITLE : OpenGL : sluggish performance in extracting texture from GPU - Game Development Stack Exchange
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_BYTE, t.data); // <-- This is the line.......
http://gamedev.stackexchange.com/questions/44783/opengl-sluggish-performance-in-extracting-texture-from-gpu
TITLE : OpenGL : sluggish performance in extracting texture from GPU - Game Development Stack Exchange
How are you measuring that time? Remember that OpenGL calls are normally asynchrounous, but glGetTexImage() must wait until processing is done so that the result it reads back is correct. ? Anton Dec 1 '12 at 11:39.......
http://gamedev.stackexchange.com/questions/44783/opengl-sluggish-performance-in-extracting-texture-from-gpu
TITLE : OpenGL : sluggish performance in extracting texture from GPU - Game Development Stack Exchange
Bind it for "pack" and then do your glGetTexImage() call, which will copy the contents of the render target into the PBO........
http://gamedev.stackexchange.com/questions/44783/opengl-sluggish-performance-in-extracting-texture-from-gpu
TITLE : OpenGL : sluggish performance in extracting texture from GPU - Game Development Stack Exchange
Note also that with PBOs the glGetTexImage() call is asynchronous. That is, you can do additional work on the CPU or GPU between steps 2 and 3, while the memory transfer runs in the background. When you call glMapBuffer() it will wait for the transfer to finish, if it's not already done........
http://gamedev.stackexchange.com/questions/44783/opengl-sluggish-performance-in-extracting-texture-from-gpu
TITLE : OpenGL : sluggish performance in extracting texture from GPU - Game Development Stack Exchange
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_BYTE, t.data);.......
http://gamedev.stackexchange.com/questions/44783/opengl-sluggish-performance-in-extracting-texture-from-gpu
TITLE : Screen-Capture/FrameReader.m at master moksamedia/Screen-Capture GitHub
glGetTexImage(GL_TEXTURE_RECTANGLE_ARB, 0, GL_BGRA,.......
http://github.com/moksamedia/Screen-Capture/blob/master/FrameReader.m
TITLE : Reading the OpenGL backbuffer to system memory
glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, downsampleData);.......
http://lektiondestages.blogspot.com/2013/01/reading-opengl-backbuffer-to-system.html
TITLE : glGetTexImage function (Windows)
void WINAPI glGetTexImage(.......
http://msdn.microsoft.com/ja-jp/library/windows/desktop/dd373557(v=vs.85).aspx
TITLE : glGetTexImage : PyOpenGL 3.1.0 GL Man Pages
glGetTexImage( GLenum ( target ) , GLint ( level ) , GLenum ( format ) , GLenum ( type ) , GLvoid * ( img ) )-> void.......
http://pyopengl.sourceforge.net/documentation/manual-3.0/glGetTexImage.html
TITLE : glGetTexImage : PyOpenGL 3.1.0 GL Man Pages
glGetTexImage( target , level , format , type , array = None , outputType = ).......
http://pyopengl.sourceforge.net/documentation/manual-3.0/glGetTexImage.html
TITLE : glGetTexImage : PyOpenGL 3.1.0 GL Man Pages
glGetTexImages( target , level , format , type = GL_SHORT , array = None , outputType = ).......
http://pyopengl.sourceforge.net/documentation/manual-3.0/glGetTexImage.html
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