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Fix wrong alpha channel for OpenGL render results with transparent textures or

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materials, the typical glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); blend
function does not give correct destination alpha.
This commit is contained in:
Brecht Van Lommel
2013-02-18 17:39:44 +00:00
parent 9ab3d4ff1e
commit 525da1f872
1 changed files with 6 additions and 1 deletions
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7
source/blender/gpu/intern/gpu_draw.c
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@@ -395,7 +395,12 @@ static void gpu_set_alpha_blend(GPUBlendMode alphablend)
}
else if (ELEM(alphablend, GPU_BLEND_ALPHA, GPU_BLEND_ALPHA_SORT)) {
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
/* for OpenGL render we use the alpha channel, this makes alpha blend correct */
if (GLEW_VERSION_1_4)
glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
else
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
/* if U.glalphaclip == 1.0, some cards go bonkers...
* turn off alpha test in this case */