2014/10/15 下午 10:09:40

iphone Programming Glossary: glorthof

Drawing into OpenGL ES framebuffer and getting UIImage from it on iPhone

http://stackoverflow.com/questions/10936157/drawing-into-opengl-es-framebuffer-and-getting-uiimage-from-it-on-iphone

OpenGL ES; rendering texture created from CGBitmapContext

http://stackoverflow.com/questions/2713890/opengl-es-rendering-texture-created-from-cgbitmapcontext

pass initialisation code not shown but works fine for untextured primitives glMatrixMode GL_PROJECTION glLoadIdentity glOrthof 0 xSize 0 ySize 1.0f 1.0f glMatrixMode GL_MODELVIEW glColor4f 1.0f 1.0f 1.0f 1.0f glEnable GL_TEXTURE_2D glBlendFunc GL_ONE..

Can example “GLImageProcessing” work with multi filters

http://stackoverflow.com/questions/4375479/can-example-glimageprocessing-work-with-multi-filters

work at all can anybody can help me about this thank you for review init glMatrixMode GL_PROJECTION glLoadIdentity glOrthof 0 wide 0 high 1 1 glMatrixMode GL_MODELVIEW glLoadIdentity glScalef wide high 1 glBindTexture GL_TEXTURE_2D Input.texID..

Why is this OpenGL ES code slow on iPhone?

http://stackoverflow.com/questions/450042/why-is-this-opengl-es-code-slow-on-iphone

0 0 1 0 0 1 1 1 void setupView glViewport 0 0 backingWidth backingHeight glMatrixMode GL_PROJECTION glLoadIdentity glOrthof 0.0f backingWidth backingHeight 0.0f 10.0f 10.0f glMatrixMode GL_MODELVIEW glClearColor 0.3f 0.0f 0.0f 1.0f glVertexPointer..

Explain how OpenGL ES background images work

http://stackoverflow.com/questions/4820372/explain-how-opengl-es-background-images-work

it appears to be background I do this because my camera angle is fixed. or you can push some matrices to make use of glOrthof before drawing the images and pop the matrices off after. Here is some code to help you with the image draw to opengl glPushMatrix..

In OpenGL ES, how do I convert screen coordinates to world coordinates?

http://stackoverflow.com/questions/611468/in-opengl-es-how-do-i-convert-screen-coordinates-to-world-coordinates

This goes in your init code somewhere Set up 480x320 orthographic projection glMatrixMode GL_PROJECTION glLoadIdentity glOrthof 240.0f 240.0f 160.0f 160.0f 1.0f 1.0f Rotate into landscape mode glMatrixMode GL_MODELVIEW glLoadIdentity glRotatef 90.0f..

GLImageProcessing Multiple Filters?

http://stackoverflow.com/questions/6425861/glimageprocessing-multiple-filters

#define NUM_FILTERS sizeof filter sizeof filter 0 rt_assert mode NUM_FILTERS glMatrixMode GL_PROJECTION glLoadIdentity glOrthof 0 wide 0 high 1 1 glMatrixMode GL_MODELVIEW glLoadIdentity glScalef wide high 1 glBindTexture GL_TEXTURE_2D Input.texID..

Save OpenGL Drawn item as a Image

http://stackoverflow.com/questions/9660723/save-opengl-drawn-item-as-a-image

GL_PROJECTION CGRect frame self.bounds CGFloat scale self.contentScaleFactor Setup the view port in Pixels glOrthof 0 frame.size.width scale 0 frame.size.height scale 1 1 glViewport 0 0 frame.size.width scale frame.size.height scale glMatrixMode..

Record the drawing as a m4v video file - OpenGL

http://stackoverflow.com/questions/9661259/record-the-drawing-as-a-m4v-video-file-opengl