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GL_ARB_texture_swizzle
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https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_texture_swizzle.txt
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GL_ARB_texture_swizzle
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GL_TEXTURE_SWIZZLE_R 0x8E42
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GL_TEXTURE_SWIZZLE_G 0x8E43
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GL_TEXTURE_SWIZZLE_B 0x8E44
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GL_TEXTURE_SWIZZLE_A 0x8E45
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GL_TEXTURE_SWIZZLE_RGBA 0x8E46
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