sksl: Add a "sk_Clockwise" built-in

This allows us to identify clockwise-winding triangles, in terms of
Skia device space, in all backends and with all render target origins.

Bug: skia:
Change-Id: I220e1c459e0129d1cc4dee6458ef94277fbedd21
Reviewed-on: https://skia-review.googlesource.com/142662
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>

1 files changed, 14 insertions, 10 deletions

diff --git a/src/gpu/vk/GrVkPipelineStateBuilder.cpp b/src/gpu/vk/GrVkPipelineStateBuilder.cpp
index 91685c6016..bcccbc0c17 100644
--- a/src/gpu/vk/GrVkPipelineStateBuilder.cpp
+++ b/src/gpu/vk/GrVkPipelineStateBuilder.cpp
@@ -204,19 +204,23 @@ GrVkPipelineState* GrVkPipelineStateBuilder::finalize(const GrStencilSettings& s
 
 //////////////////////////////////////////////////////////////////////////////
 
-uint32_t get_blend_info_key(const GrPipeline& pipeline) {
-    GrXferProcessor::BlendInfo blendInfo;
-    pipeline.getXferProcessor().getBlendInfo(&blendInfo);
-
-    static const uint32_t kBlendWriteShift = 1;
+uint32_t get_pipeline_info_key(const GrPipeline& pipeline) {
     static const uint32_t kBlendCoeffShift = 5;
     GR_STATIC_ASSERT(kLast_GrBlendCoeff < (1 << kBlendCoeffShift));
     GR_STATIC_ASSERT(kFirstAdvancedGrBlendEquation - 1 < 4);
 
-    uint32_t key = blendInfo.fWriteColor;
-    key |= (blendInfo.fSrcBlend << kBlendWriteShift);
-    key |= (blendInfo.fDstBlend << (kBlendWriteShift + kBlendCoeffShift));
-    key |= (blendInfo.fEquation << (kBlendWriteShift + 2 * kBlendCoeffShift));
+    GrXferProcessor::BlendInfo blendInfo;
+    pipeline.getXferProcessor().getBlendInfo(&blendInfo);
+
+    GrSurfaceOrigin origin = pipeline.proxy()->origin();
+    SkASSERT(0 == origin || 1 == origin);
+
+    uint32_t key;
+    key = blendInfo.fEquation;
+    key = blendInfo.fDstBlend | (key << kBlendCoeffShift);
+    key = blendInfo.fSrcBlend | (key << kBlendCoeffShift);
+    key = (int)blendInfo.fWriteColor | (key << 1);
+    key = origin | (key << 1);
 
     return key;
 }
@@ -238,7 +242,7 @@ bool GrVkPipelineStateBuilder::Desc::Build(Desc* desc,
 
     stencil.genKey(&b);
 
-    b.add32(get_blend_info_key(pipeline));
+    b.add32(get_pipeline_info_key(pipeline));
 
     b.add32((uint32_t)primitiveType);