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Fixed computation of the alpha channel in sf::BlendAdd

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This commit is contained in:
Laurent Gomila 2013-01-03 20:34:51 +01:00
parent 2285e3d344
commit 38da3f4338
1 changed files with 6 additions and 2 deletions
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8
src/SFML/Graphics/RenderTarget.cpp
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@ -344,9 +344,10 @@ void RenderTarget::applyBlendMode(BlendMode mode)
{
switch (mode)
{
// Alpha blending
// glBlendFuncSeparateEXT is used when available to avoid an incorrect alpha value when the target
// is a RenderTexture -- in this case the alpha value must be written directly to the target buffer
// Alpha blending
default :
case BlendAlpha :
if (GLEW_EXT_blend_func_separate)
@ -357,7 +358,10 @@ void RenderTarget::applyBlendMode(BlendMode mode)
// Additive blending
case BlendAdd :
glCheck(glBlendFunc(GL_SRC_ALPHA, GL_ONE));
if (GLEW_EXT_blend_func_separate)
glCheck(glBlendFuncSeparateEXT(GL_SRC_ALPHA, GL_ONE, GL_ONE, GL_ONE));
else
glCheck(glBlendFunc(GL_SRC_ALPHA, GL_ONE));
break;
// Multiplicative blending