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Currently, I am trying to draw an image using openGL (the image updates very often, and thus must be redrawn). Previously, I was converting my image from YUV to RGB, and then using this new image to draw with openGL. All worked fine, but the conversion process was not particularly fast. I am now attempting to change the code so that the conversion is taken care of in the openGL shaders. After looking around, I've found a couple code snippets (particularly the shaders and the bulk of my renderImage function) that have helped me get a baseline, but I can't seem to actually get the image to draw properly - all I ever see is a black image. It's quite likely that I'm missing something extremely simple and important - My experience with openGL is rather limited. If anyone can take a look and see if they recognize anything wrong, please let me know. I should point out, I'm trying to support iOS 4.x, so CVOpenGLESTextureCacheCreateTextureFromImage shouldn't be usable (and I'm not really positive how to setup to use it even if I wanted to). Any help would be appreciated. Code below - My Vertex shader: attribute vec4 position; attribute vec4 inputTextureCoordinate; varying vec2 textureCoordinate; void main() { gl_Position = position; textureCoordinate = inputTextureCoordinate.xy; } Fragment Shader: #ifdef GL_ES precision mediump float; #endif varying vec2 textureCoordinate; uniform sampler2D videoFrame; uniform sampler2D videoFrameUV; const mat3 yuv2rgb = mat3( 1, 0, 1.2802, 1, -0.214821, -0.380589, 1, 2.127982, 0 ); void main() { vec3 yuv = vec3( 1.1643 * (texture2D(videoFrame, textureCoordinate).r - 0.0625), texture2D(videoFrameUV, textureCoordinate).r - 0.5, texture2D(videoFrameUV, textureCoordin

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