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GL_ARB_shadow
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http://www.opengl.org/registry/specs/ARB/shadow.txt
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GL_ARB_shadow
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	GL_TEXTURE_COMPARE_MODE_ARB 0x884C
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	GL_TEXTURE_COMPARE_FUNC_ARB 0x884D
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	GL_COMPARE_R_TO_TEXTURE_ARB 0x884E