2014/10/15 下午 10:09:39

iphone Programming Glossary: glmatrixmode

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

the second I did not set model and projection matricies if I use 1.1 glViewport 0 0 width height glMatrixMode GL_PROJECTION glLoadIdentity glOrthof 1.0f 1.0f 1.5f 1.5f 1.0f 1.0f glMatrixMode GL_MODELVIEW after this all works share..

OpenGL ES; rendering texture created from CGBitmapContext

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

different tutorials Just a single render 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.. 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 GL_SRC_COLOR GLuint texture 1 glGenTextures..

Can example “GLImageProcessing” work with multi filters

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

both brightness and contrast but it can't 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.. 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 bind result fbo glBindFramebufferOES..

How can I crop an Image with mask and combine it with another image (background) on iPhone? (OpenGL ES 1.1 is preferred)

http://stackoverflow.com/questions/5299452/how-can-i-crop-an-image-with-mask-and-combine-it-with-another-image-background

glColor3f 1.0 1.0 1.0 renderMask renderTextures void reshape int width int height glViewport 0 0 width height glMatrixMode GL_PROJECTION glLoadIdentity gluOrtho2D 0.0 width 0.0 height glMatrixMode GL_MODELVIEW window_size 0 width window_size 1.. width int height glViewport 0 0 width height glMatrixMode GL_PROJECTION glLoadIdentity gluOrtho2D 0.0 width 0.0 height glMatrixMode GL_MODELVIEW window_size 0 width window_size 1 height This shows the my three textures drawn normally crop bleed through..

OpenGL Texture Coordinates in Pixel Space

http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space

coordinates in this manner but haven't been able to suss out what previous calls were made that allowed for this. glMatrixMode GL_TEXTURE seems like it might be involved but I'm not quite sure how to implement it. My end goal would be to accomplish..

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

so that you don't need to convert at all 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.. 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 0.0f 1.0f 0.0f This makes it so that world coordinates 240 160 maps to the top..

GLImageProcessing Multiple Filters?

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

exaggerated by downsampling to half size #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.. 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 Remember the FBO being used for..

Save OpenGL Drawn item as a Image

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

data it's no longer needed free brushData Set the view's scale factor self.contentScaleFactor 1.0 Setup OpenGL states glMatrixMode GL_PROJECTION CGRect frame self.bounds CGFloat scale self.contentScaleFactor Setup the view port in Pixels glOrthof 0 frame.size.width.. 0 frame.size.width scale 0 frame.size.height scale 1 1 glViewport 0 0 frame.size.width scale frame.size.height scale glMatrixMode GL_MODELVIEW glDisable GL_DITHER glEnable GL_TEXTURE_2D glEnableClientState GL_VERTEX_ARRAY glEnable GL_BLEND Set a blending..

Record the drawing as a m4v video file - OpenGL

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