Fixed using GL_SAMPLE_ALPHA_TO_COVERAGE

A few things were failing when trying to use GL_SAMPLE_ALPHA_TO_COVERAGE: - The alpha test should not be skipped when GL_SAMPLE_ALPHA_TO_COVERAGE is set, otherwise no computation is performed. - The alpha reference value was wrong (the alpha-to-coverage ramp is centered around it) Change-Id: Ib9849868d267ca49fb3f0112192af8f207d34307 Reviewed-on: https://swiftshader-review.googlesource.com/8308Reviewed-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <capn@google.com> Tested-by: Alexis Hétu <sugoi@google.com>

Fixed using GL_SAMPLE_ALPHA_TO_COVERAGE
a9beed30 · Alexis Hetu · Alexis Hétu · 2e363b0b · a9beed30 · a9beed30
Commit a9beed30 authored Dec 13, 2016 by Alexis Hetu Committed by Alexis Hétu Dec 14, 2016
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Showing with 3 additions and 2 deletions

Device.cpp src/OpenGL/libGLESv2/Device.cpp +1 -1

Context.cpp src/Renderer/Context.cpp +1 -0

PixelProcessor.hpp src/Renderer/PixelProcessor.hpp +1 -1

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--- a/src/OpenGL/libGLESv2/Device.cpp
+++ b/src/OpenGL/libGLESv2/Device.cpp
@@ -52,7 +52,7 @@ namespace es2
 		setDestBlendFactor(BLEND_ZERO);
 		setCullMode(CULL_COUNTERCLOCKWISE);
 		setDepthCompare(DEPTH_LESSEQUAL);
-		setAlphaReference(0.0f);
+		setAlphaReference(127.5f);
 		setAlphaCompare(ALPHA_ALWAYS);
 		setAlphaBlendEnable(false);
 		setFogEnable(false);

--- a/src/Renderer/Context.cpp
+++ b/src/Renderer/Context.cpp
@@ -515,6 +515,7 @@ namespace sw

 	bool Context::alphaTestActive()
 	{
+		if(transparencyAntialiasing != TRANSPARENCY_NONE) return true;
 		if(!alphaTestEnable) return false;
 		if(alphaCompareMode == ALPHA_ALWAYS) return false;
 		if(alphaReference == 0.0f && alphaCompareMode == ALPHA_GREATEREQUAL) return false;

--- a/src/Renderer/PixelProcessor.hpp
+++ b/src/Renderer/PixelProcessor.hpp
@@ -122,7 +122,7 @@ namespace sw

 			bool alphaTestActive() const
 			{
-				return alphaCompareMode != ALPHA_ALWAYS;
+				return (alphaCompareMode != ALPHA_ALWAYS) || (transparencyAntialiasing != TRANSPARENCY_NONE);
 			}

 			bool pixelFogActive() const