what’s the difference between GL_ONE_MINUS_SRC1_ALPHA and GL_ONE_MINUS_SRC_ALPHA ? Thanks! eg. glBlendFunc(GR_GL_ONE, GL_ONE_MINUS_SRC_ALPHA) glBlendFunc(GR_GL_ONE, GL_ONE_MINUS_SRC1_ALPHA)

When dual-source blending is used (with multiple outputs from the fragment shader), you have two source, thus two alpha values. SRC_ALPHA is the default and is assumed to be SRC0, which is gl_FragData[0].a, and SRC1_ALPHA is gl_FragData[1].a.

is there any demo for this? thanks! what’s the application scenarios of 2 outputs? what’s the max count of the output?

[image] Dual source blending?! OpenGL: Advanced Coding What exactly is dual source blending good for? Is it just for specific hardware that can get some more performance then doing it in a fragment shader? Or does it actually give some functionality that can not be done v…

What's the meaning of GL_ONE_MINUS_SRC1_ALPHA?

OpenGL OpenGL: Advanced Coding

Dark_Photon July 22, 2025, 12:32pm 4

For examples, just web search for: “dual-source blending”.