opengl es(iphone) render from file - ios

Question

sorry for my english
I want to display video from a file, where the frames of 4 bytes per pixel, BRGA, 1280x720?
on mac I just took out the frame and drew this glDrawPixels, running on a Mac but in opengl es all differently.
here's the code from the mac
int pos = 0;
NSData *data = [[NSData alloc] initWithContentsOfFile:#"video.raw"];
glViewport(0,0,width,height);
glLoadIdentity();
glOrtho(0, width, 0, height, -1.0, 1.0);
glPixelZoom(1, -1);
glClear(GL_COLOR_BUFFER_BIT);
//glRasterPos2i(0, height);
glRasterPos2i(0, 0);
glDrawPixels(1280, 720, GL_BGRA, GL_UNSIGNED_BYTE, [data bytes]+pos);
glFinish();

Answer 1

Push those data to texture with "glTexSubImage2D" and render the texture. Note though that texture has to be of power of 2 so for your case you can make it (2048, 1024) but you may update only the (1280, 720) part:
CGSize videoSize;
CGSize textureSize;
GLuint dimension = 1;
while (videoSize.width > dimension) {
dimension <<= 1;
}
textureSize = CGSizeMake(dimension, .0f);
dimension = 1;
while (videoSize.height > dimension) {
dimension <<= 1;
}
textureSize = CGSizeMake(textureSize.width, dimension);
GLuint texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, textureSize.width, textureSize.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
GLfloat textureCoordinates[] = {
.0f, .0f,
.0f, videoSize.height/textureSize.height,
videoSize.width/textureSize.width, .0f,
videoSize.width/textureSize.width, videoSize.height/textureSize.height
};
To update the texture:
void *data;
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, videoSize.width, videoSize.height, GL_RGBA, GL_UNSIGNED_BYTE, data);
Then just draw your textured quad.