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    <p><strong>glReadPixels</strong> function reads from framebuffers, not textures. To read a texture object you must use <strong>glGetTexImage</strong> but <strong>it isn't available in OpenGL ES</strong> :(</p> <p>If you want to read the buffer from your texture then <strong>you can bind it to an FBO (FrameBuffer Object) and use glReadPixels</strong>:</p> <pre><code>//Generate a new FBO. It will contain your texture. glGenFramebuffersOES(1, &amp;offscreen_framebuffer); glBindFramebufferOES(GL_FRAMEBUFFER_OES, offscreen_framebuffer); //Create the texture glGenTextures(1, &amp;my_texture); glBindTexture(GL_TEXTURE_2D, my_texture); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); //Bind the texture to your FBO glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES, GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, my_texture, 0); //Test if everything failed GLenum status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES); if(status != GL_FRAMEBUFFER_COMPLETE_OES) { printf("failed to make complete framebuffer object %x", status); } </code></pre> <p>Then, you only must call to glReadPixels when you want to read from your texture:</p> <pre><code>//Bind the FBO glBindFramebufferOES(GL_FRAMEBUFFER_OES, offscreen_framebuffer); // set the viewport as the FBO won't be the same dimension as the screen glViewport(0, 0, width, height); GLubyte* pixels = (GLubyte*) malloc(width * height * sizeof(GLubyte) * 4); glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, pixels); //Bind your main FBO again glBindFramebufferOES(GL_FRAMEBUFFER_OES, screen_framebuffer); // set the viewport as the FBO won't be the same dimension as the screen glViewport(0, 0, screen_width, screen_height); </code></pre>
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