Can some gl_FragData info be skipped?

OpenGL
1

I have a deferred renderer implemented.

The color texture is bound to the first gl_FragData slot (0).

The normal data is bound the the second.

Is it possible to only write to gl_FragData[0] and skip gl_FragData[1], leaving it as-is? This would be used for transparency or decals, which would only affect the color, and would not affect the depth or normal.

2

You could use separate color masks to achieve this.

http://www.opengl.org/registry/specs/EXT/draw_buffers2.txt

3

ColorMaskIndexedEXT is exactly what I was looking for. :smiley:

Thanks! This is perfect for decals, too.

4

Wonderful extension. Fits in perfectly to my renderer. GEForce 8+ only and requires a completely separate rendering approach for transparency for ATI cards and GE Force 7s. :frowning:

5

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