CODEWITHSUNDEEP
androidopengl-esfbo
Habba
Habba

Reputation: 1199

OpenGL ES 1.1: How to substitute glBlendFuncSeparate?

My problem is pretty much the same as here.

This would also be the answer, if glBlendFuncSeparate was available for me:

glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ZERO, GL_ONE);

However, since I need to provide support for MALI-400MP (Samsung Galaxy Nexus S II), I can't use glBlendFuncSeparate (GL_OES_blend_func_separate extension not present).

use of glColorMask is adviced, but how do I use it properly? Is there any other way to do this?

Upvotes: 1

Views: 1803

Answers (1)

Tim
Tim

Reputation: 35943

It seems pretty well answered in the other question, but if all you want to do is disable writing to the alpha channel, you just call glColorMask(true,true,true,false); before drawing your blended objects. This locks the alpha layer from being modified while it is being written.

Upvotes: 3

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