2014/10/15 下午 10:09:39

iphone Programming Glossary: glloadidentity

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

Advice on speeding up OpenGL ES 1.1 on the iPhone

http://stackoverflow.com/questions/1844765/advice-on-speeding-up-opengl-es-1-1-on-the-iphone

will give me the most bang for the buck. My scene rendering goes something like this Repeat 35 times glPushMatrix glLoadIdentity glTranslate Repeat 7 times glBindTexture glVertexPointer glNormalPointer glTexCoordPointer glDrawArrays GL_TRIANGLES .....

Draw to offscreen renderbuffer in OpenGL ES (iPhone)

http://stackoverflow.com/questions/1853551/draw-to-offscreen-renderbuffer-in-opengl-es-iphone

GL_FRAMEBUFFER_OES offscreenFramebuffer GLfloat vc 0.0f 0.0f 0.0f 10.0f 10.0f 10.0f 0.0f 0.0f 0.0f 10.0f 10.0f 10.0f glLoadIdentity glEnableClientState GL_VERTEX_ARRAY glVertexPointer 3 GL_FLOAT 0 vc glDrawArrays GL_LINES 0 4 glDisableClientState GL_VERTEX_ARRAY..

OpenGL ES; rendering texture created from CGBitmapContext

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

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 glEnable GL_TEXTURE_2D glBlendFunc..

Can example “GLImageProcessing” work with multi filters

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

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 GL_TEXTURE_2D Input.texID.. 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 GL_FRAMEBUFFER_OES resultFBO..

Why is this OpenGL ES code slow on iPhone?

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

spriteTexcoords 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.. GL_TEXTURE_2D glBlendFunc GL_ONE GL_ONE_MINUS_SRC_ALPHA glEnable GL_BLEND void drawView .. glClear GL_COLOR_BUFFER_BIT glLoadIdentity glTranslatef tx 100 ty 100 10 for int i 0 i 200 i glTranslatef 1 1 0 glDrawArrays GL_TRIANGLE_STRIP 0 4 .. drawView is called..

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

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 height This shows the my three..

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

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 glLoadIdentity glRotatef.. 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 left of the screen bottom..

GLImageProcessing Multiple Filters?

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

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 GL_TEXTURE_2D Input.texID.. 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 the display framebuffer glGetIntegerv..