Introduce dynamic pipeline state

Adds a DynamicState struct to GrPipeline that has a field for the
scissor rect. Eventually this should become the only way to specify a
scissor rectangle and may grow to contain more fields. Adds an array of
DynamicStates to GrGpuCommandBuffer::draw and implements support in GL
and Vulkan.

Bug: skia:
Change-Id: If5aebbf9da5d192acf7e68e7def4674ffc7ec310
Reviewed-on: https://skia-review.googlesource.com/18510
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>

3 files changed, 14 insertions, 3 deletions

diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index b6c807656f..50c0edba45 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -2449,6 +2449,7 @@ GrGLenum gPrimitiveType2GLMode[] = {
 void GrGLGpu::draw(const GrPipeline& pipeline,
                    const GrPrimitiveProcessor& primProc,
                    const GrMesh meshes[],
+                   const GrPipeline::DynamicState dynamicStates[],
                    int meshCount) {
     this->handleDirtyContext();
 
@@ -2468,6 +2469,14 @@ void GrGLGpu::draw(const GrPipeline& pipeline,
             this->xferBarrier(pipeline.getRenderTarget(), barrierType);
         }
 
+        if (dynamicStates) {
+            if (pipeline.getScissorState().enabled()) {
+                GrGLRenderTarget* glRT = static_cast<GrGLRenderTarget*>(pipeline.getRenderTarget());
+                this->flushScissor(dynamicStates[i].fScissorRect,
+                                   glRT->getViewport(), glRT->origin());
+            }
+        }
+
         meshes[i].sendToGpu(primProc, this);
     }
 
diff --git a/src/gpu/gl/GrGLGpu.h b/src/gpu/gl/GrGLGpu.h
index 1785eae143..639b589f50 100644
--- a/src/gpu/gl/GrGLGpu.h
+++ b/src/gpu/gl/GrGLGpu.h
@@ -101,7 +101,8 @@ public:
     // on GrGLGpuCommandBuffer.
     void draw(const GrPipeline&,
               const GrPrimitiveProcessor&,
-              const GrMesh*,
+              const GrMesh[],
+              const GrPipeline::DynamicState[],
               int meshCount);
 
 
diff --git a/src/gpu/gl/GrGLGpuCommandBuffer.h b/src/gpu/gl/GrGLGpuCommandBuffer.h
index c7c76a4a9c..c6e7208f4c 100644
--- a/src/gpu/gl/GrGLGpuCommandBuffer.h
+++ b/src/gpu/gl/GrGLGpuCommandBuffer.h
@@ -49,7 +49,8 @@ private:
 
     void onDraw(const GrPipeline& pipeline,
                 const GrPrimitiveProcessor& primProc,
-                const GrMesh* mesh,
+                const GrMesh mesh[],
+                const GrPipeline::DynamicState dynamicStates[],
                 int meshCount,
                 const SkRect& bounds) override {
         GrGLRenderTarget* target = static_cast<GrGLRenderTarget*>(pipeline.getRenderTarget());
@@ -57,7 +58,7 @@ private:
             fRenderTarget = target;
         }
         SkASSERT(target == fRenderTarget);
-        fGpu->draw(pipeline, primProc, mesh, meshCount);
+        fGpu->draw(pipeline, primProc, mesh, dynamicStates, meshCount);
     }
 
     void onClear(GrRenderTarget* rt, const GrFixedClip& clip, GrColor color) override {