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Addative Blend

Started by AmidaBucu Dec 29, 2008 at 8:38 AM 1 replies 600+ views

Original Post

Dec 29, 2008 at 8:38 AM

Hi there! I want to draw into a texture multiple times. So i have to use alpha blend in the shader technique definition:


AlphaBlendEnable=true;
SrcBlend=srcalpha;
DestBlend=invsrcColor;

It works, but I don't want blending works in that way. If I write that instead of the code above:


SrcBlend=1;
DestBlend=1;

Everything has become black :( I want the pixel colors to be added to each others, not to be blended.

KodeNerd

Dec 29, 2008 at 1:14 PM

Needing more information. Language? Library/engine?

swiftcoder

Mod

2,296

swiftcoder

Dec 29, 2008 at 1:28 PM

If we are talking about OpenGL-style blending, the equation used is: src*src_factor + dst*dst_factor

Therefore to obtain solely additive blending, one must set src_factor and dst_factor both to GL_ONE.

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