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Can fragment shader in OpenGL ES 2.0 change the Z value (depth) of a pixel?
How is this achieved in OpenGL ES 2.0?
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No --
gl_FragDepth(which is part of the desktop version of GLSL) is not present in OpenGL ES.You can, however, check for the existence of
GL_EXT_frag_depth. If it's available, then you can write the depth togl_FragDepthEXT.The extension paper gives more details about how to enable the extension and such.