Make GrGLSLPrimitiveProcessor::emitTransforms take local coords as GrShaderVar.

Also remove unused position variable parameter.

Change-Id: I37f98a03ac1ca750810de13b08e3ffa11e41828c
Reviewed-on: https://skia-review.googlesource.com/81320
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

2 files changed, 20 insertions, 18 deletions

diff --git a/src/gpu/glsl/GrGLSLGeometryProcessor.cpp b/src/gpu/glsl/GrGLSLGeometryProcessor.cpp
index 8ee9bbdd21..01322eddea 100644
--- a/src/gpu/glsl/GrGLSLGeometryProcessor.cpp
+++ b/src/gpu/glsl/GrGLSLGeometryProcessor.cpp
@@ -43,10 +43,12 @@ void GrGLSLGeometryProcessor::emitCode(EmitArgs& args) {
 void GrGLSLGeometryProcessor::emitTransforms(GrGLSLVertexBuilder* vb,
                                              GrGLSLVaryingHandler* varyingHandler,
                                              GrGLSLUniformHandler* uniformHandler,
-                                             const GrShaderVar& posVar,
-                                             const char* localCoords,
+                                             const GrShaderVar& localCoordsVar,
                                              const SkMatrix& localMatrix,
                                              FPCoordTransformHandler* handler) {
+    SkASSERT(GrSLTypeIsFloatType(localCoordsVar.getType()));
+    SkASSERT(2 == GrSLTypeVecLength(localCoordsVar.getType()));
+
     int i = 0;
     while (const GrCoordTransform* coordTransform = handler->nextCoordTransform()) {
         SkString strUniName;
@@ -75,9 +77,10 @@ void GrGLSLGeometryProcessor::emitTransforms(GrGLSLVertexBuilder* vb,
         handler->specifyCoordsForCurrCoordTransform(SkString(v.fsIn()), varyingType);
 
         if (kFloat2_GrSLType == varyingType) {
-            vb->codeAppendf("%s = (%s * float3(%s, 1)).xy;", v.vsOut(), uniName, localCoords);
+            vb->codeAppendf("%s = (%s * float3(%s, 1)).xy;", v.vsOut(), uniName,
+                            localCoordsVar.c_str());
         } else {
-            vb->codeAppendf("%s = %s * float3(%s, 1);", v.vsOut(), uniName, localCoords);
+            vb->codeAppendf("%s = %s * float3(%s, 1);", v.vsOut(), uniName, localCoordsVar.c_str());
         }
         ++i;
     }
diff --git a/src/gpu/glsl/GrGLSLGeometryProcessor.h b/src/gpu/glsl/GrGLSLGeometryProcessor.h
index 17a67797d0..de1e4fd02a 100644
--- a/src/gpu/glsl/GrGLSLGeometryProcessor.h
+++ b/src/gpu/glsl/GrGLSLGeometryProcessor.h
@@ -28,26 +28,25 @@ protected:
                                 const GrGLSLProgramDataManager& pdman,
                                 FPCoordTransformIter*);
 
-    // Emit a uniform matrix for each coord transform.
-    void emitTransforms(GrGLSLVertexBuilder* vb,
-                        GrGLSLVaryingHandler* varyingHandler,
-                        GrGLSLUniformHandler* uniformHandler,
-                        const GrShaderVar& posVar,
-                        const char* localCoords,
-                        FPCoordTransformHandler* handler) {
-        this->emitTransforms(vb, varyingHandler, uniformHandler,
-                             posVar, localCoords, SkMatrix::I(), handler);
-    }
-
-    // Emit pre-transformed coords as a varying per coord-transform.
+    // Emit transformed local coords from the vertex shader as a uniform matrix and varying per
+    // coord-transform.
     void emitTransforms(GrGLSLVertexBuilder*,
                         GrGLSLVaryingHandler*,
                         GrGLSLUniformHandler*,
-                        const GrShaderVar& posVar,
-                        const char* localCoords,
+                        const GrShaderVar& localCoordsVar,
                         const SkMatrix& localMatrix,
                         FPCoordTransformHandler*);
 
+    // Version of above that assumes identity for the local matrix.
+    void emitTransforms(GrGLSLVertexBuilder* vb,
+                        GrGLSLVaryingHandler* varyingHandler,
+                        GrGLSLUniformHandler* uniformHandler,
+                        const GrShaderVar& localCoordsVar,
+                        FPCoordTransformHandler* handler) {
+        this->emitTransforms(vb, varyingHandler, uniformHandler, localCoordsVar, SkMatrix::I(),
+                             handler);
+    }
+
     struct GrGPArgs {
         // Used to specify the output variable used by the GP to store its device position. It can
         // either be a float2 or a float3 (in order to handle perspective). The subclass sets this