![]() The extension for programmable blending is called APPLE_shader_framebuffer_fetch and is available for OpenGL ES on iOS 6. The fruit-branded computer company is not exactly well known for hi-end OpenGL support but this time they provide a long awaited feature for the first time. ![]() There have been requests to provide a programmable blending stage for quite some time now and finally this functionality is available – somewhere we probably didn’t expect it: On iOS from Apple. The set of possible operations however is fixed. One of the remaining fixed-functions is fragment blending: The new fragments (shaded by the fragment shader) don’t neccessarily have to overwrite the corresponding framebuffer entry, we can set different blending operations. Large parts of the rendering pipeline are user programmable through shaders nowadays. OpenGL Programmable Blending – APPLE_shader_framebuffer_fetch
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