feat: Move the alpha portion of MSAA blend modes to the blend unit (#9576) 4f9625183f

csmartdalton · csmartdalton · commit 203dafd1b7f5 · 2025-05-02T09:04:37.000Z
Move the alpha portion of MSAA blend modes to the blend unit

The advanced blend modes can be split algebraically into two distinct
operations: color and alpha.

The color portion has all the custom logic that needs to run in the
shader.

The alpha portion is run-of-the-mill source-over blending.

For the MSAA backend, move the alpha portion of the operation into the
hardware blend coefficients instead of doing it in the shader. This
gives smoother antialiasing because the blend unit does the blend at
each sample separately, whereas the shader runs once per fragment
against a single (resolved) destination color.
diff --git a/.rive_head b/.rive_head
@@ -1 +1 @@
-7051d2685fbfaaafe6cf558698b6c425ca709cc4
+4f9625183f27235352619de688c0cf6a66e932d7
diff --git a/submodules/rive-runtime b/submodules/rive-runtime
@@ -1 +1 @@
-Subproject commit bc95119bfd37b327c3a5922ed7bf7b9041748c52
+Subproject commit 4da8b119fc9d50af6e380689b62de5c2fc64bdc8

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-7051d2685fbfaaafe6cf558698b6c425ca709cc4`
	`1`	`+4f9625183f27235352619de688c0cf6a66e932d7`