Rasterizer discard implementation Implemented rasterizer discard by not using the SetupRoutine and always returning 0 when rasterizer discard is enabled. Also guarded all clear calls with a check for rasterizer discard. Passes all rasterizer discard related dEQP tests. Change-Id: I1e5c107e3dba550f7a5b01eb302ff51bdac303dc Reviewed-on: https://swiftshader-review.googlesource.com/4876 Tested-by: Alexis Hétu <sugoi@google.com> Reviewed-by: Nicolas Capens <capn@google.com>

diff --git a/src/Renderer/Context.cpp b/src/Renderer/Context.cpp
index 640f26a..bde6c94 100644
--- a/src/Renderer/Context.cpp
+++ b/src/Renderer/Context.cpp

@@ -253,6 +253,8 @@
 		fillMode = FILL_SOLID;
 		shadingMode = SHADING_GOURAUD;
 
+		rasterizerDiscard = false;
+
 		depthCompareMode = DEPTH_LESS;
 		depthBufferEnable = true;
 		depthWriteEnable = true;

diff --git a/src/Renderer/Context.hpp b/src/Renderer/Context.hpp
index ee2bef8..169df8a 100644
--- a/src/Renderer/Context.hpp
+++ b/src/Renderer/Context.hpp

@@ -494,6 +494,7 @@
 		bool occlusionEnabled;

 

 		// Pixel processor states

+		bool rasterizerDiscard;

 		bool depthBufferEnable;

 		DepthCompareMode depthCompareMode;

 		bool depthWriteEnable;


diff --git a/src/Renderer/Renderer.cpp b/src/Renderer/Renderer.cpp
index ca5e67a..cc95546 100644
--- a/src/Renderer/Renderer.cpp
+++ b/src/Renderer/Renderer.cpp

@@ -821,7 +821,7 @@
 					startTick = time;
 				#endif
 
-				int visible = setupPrimitives(this, unit, count);
+				int visible = draw->setupState.rasterizerDiscard ? 0 : setupPrimitives(this, unit, count);
 
 				primitiveProgress[unit].visible = visible;
 				primitiveProgress[unit].references = clusterCount;
@@ -2315,6 +2315,11 @@
 		slopeDepthBias = slopeBias;
 	}
 
+	void Renderer::setRasterizerDiscard(bool rasterizerDiscard)
+	{
+		context->rasterizerDiscard = rasterizerDiscard;
+	}
+
 	void Renderer::setPixelShader(const PixelShader *shader)
 	{
 		context->pixelShader = shader;

diff --git a/src/Renderer/Renderer.hpp b/src/Renderer/Renderer.hpp
index a818eaa..30fccc5 100644
--- a/src/Renderer/Renderer.hpp
+++ b/src/Renderer/Renderer.hpp

@@ -340,6 +340,8 @@
 		virtual void setDepthBias(float bias);
 		virtual void setSlopeDepthBias(float slopeBias);
 
+		virtual void setRasterizerDiscard(bool rasterizerDiscard);
+
 		// Programmable pipelines
 		virtual void setPixelShader(const PixelShader *shader);
 		virtual void setVertexShader(const VertexShader *shader);

diff --git a/src/Renderer/SetupProcessor.cpp b/src/Renderer/SetupProcessor.cpp
index 34b11be..6d4d7cb 100644
--- a/src/Renderer/SetupProcessor.cpp
+++ b/src/Renderer/SetupProcessor.cpp

@@ -89,6 +89,7 @@
 		state.pointSizeRegister = 0xF;   // No vertex point size
 
 		state.multiSample = context->getMultiSampleCount();
+		state.rasterizerDiscard = context->rasterizerDiscard;
 
 		if(context->vertexShader)
 		{

diff --git a/src/Renderer/SetupProcessor.hpp b/src/Renderer/SetupProcessor.hpp
index 0d2c81a..02133f0 100644
--- a/src/Renderer/SetupProcessor.hpp
+++ b/src/Renderer/SetupProcessor.hpp

@@ -49,6 +49,7 @@
 			bool slopeDepthBias            : 1;

 			bool vFace                     : 1;

 			unsigned int multiSample       : 3;   // 1, 2 or 4

+			bool rasterizerDiscard         : 1;

 

 			struct Gradient

 			{