Default geometry processor

src/gpu/gl/builders/GrGLVertexShaderBuilder.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLVertexShaderBuilder.h"
 #include "GrGLProgramBuilder.h"
 #include "GrGLShaderStringBuilder.h"
 #include "../GrGpuGL.h"
 
 #define GL_CALL(X) GR_GL_CALL(fProgramBuilder->gpu()->glInterface(), X)
 #define GL_CALL_RET(R, X) GR_GL_CALL_RET(fProgramBuilder->gpu()->glInterface(), R, X)
 
 static const char* color_attribute_name() { return "inColor"; }
 static const char* coverage_attribute_name() { return "inCoverage"; }
 
 GrGLVertexBuilder::GrGLVertexBuilder(GrGLProgramBuilder* program)
     : INHERITED(program)
     , fPositionVar(NULL)
     , fLocalCoordsVar(NULL)
+    , fRtAdjustName(NULL)
     , fEffectAttribOffset(0) {
 }
 
 void GrGLVertexBuilder::addVarying(const char* name, GrGLVarying* v) {
     fOutputs.push_back();
     fOutputs.back().setType(v->fType);
     fOutputs.back().setTypeModifier(GrGLShaderVar::kVaryingOut_TypeModifier);
     fProgramBuilder->nameVariable(fOutputs.back().accessName(), 'v', name);
     v->fVsOut = fOutputs.back().getName().c_str();
 }
 
-void GrGLVertexBuilder::setupLocalCoords() {
+void GrGLVertexBuilder::setupUniformViewMatrix() {
+    fProgramBuilder->fUniformHandles.fViewMatrixUni =
+            fProgramBuilder->addUniform(GrGLProgramBuilder::kVertex_Visibility,
+                                        kMat33f_GrSLType,
+                                        this->uViewM());
+}
+
+void GrGLVertexBuilder::setupPositionAndLocalCoords() {
+    // Setup position
+    this->codeAppendf("vec3 %s;", this->glPosition());
+
+    // setup position and local coords attribute
     fPositionVar = &fInputs.push_back();
-    fPositionVar->set(kVec2f_GrSLType, GrGLShaderVar::kAttribute_TypeModifier, "inPosition");
+    fPositionVar->set(kVec2f_GrSLType,
+                      GrGLShaderVar::kAttribute_TypeModifier,
+                      this->inPosition());
     if (-1 != fProgramBuilder->header().fLocalCoordAttributeIndex) {
         fLocalCoordsVar = &fInputs.push_back();
         fLocalCoordsVar->set(kVec2f_GrSLType,
                              GrGLShaderVar::kAttribute_TypeModifier,
                              "inLocalCoords");
     } else {
         fLocalCoordsVar = fPositionVar;
     }
     fEffectAttribOffset = fInputs.count();
 }
 
-void GrGLVertexBuilder::transformGLToSkiaCoords() {
-    const char* viewMName;
-    fProgramBuilder->fUniformHandles.fViewMatrixUni =
-            fProgramBuilder->addUniform(GrGLProgramBuilder::kVertex_Visibility,
-                                        kMat33f_GrSLType,
-                                        "ViewM",
-                                        &viewMName);
-
-    // Transform the position into Skia's device coords.
-    this->codeAppendf("vec3 pos3 = %s * vec3(%s, 1);", viewMName, fPositionVar->c_str());
-}
-
 void GrGLVertexBuilder::setupBuiltinVertexAttribute(const char* inName, GrGLSLExpr1* out) {
     GrGLVertToFrag v(kFloat_GrSLType);
     fProgramBuilder->addVarying(inName, &v);
     SkString name(inName);
     name.prepend("in");
     this->addAttribute(GrShaderVar(name.c_str(),
                                    kFloat_GrSLType,
                                    GrShaderVar::kAttribute_TypeModifier));
     this->codeAppendf("%s = %s;", v.vsOut(), name.c_str());
     *out = v.fsIn();
@@ skipping 14 matching lines @@
 }
 
 void GrGLVertexBuilder::emitAttributes(const GrGeometryProcessor& gp) {
     const GrGeometryProcessor::VertexAttribArray& vars = gp.getVertexAttribs();
     int numAttributes = vars.count();
     for (int a = 0; a < numAttributes; ++a) {
         this->addAttribute(vars[a]);
     }
 }
 
-void GrGLVertexBuilder::transformSkiaToGLCoords() {
-    const char* rtAdjustName;
+void GrGLVertexBuilder::transformToNormalizedDeviceSpace() {
+    // setup RT Uniform
     fProgramBuilder->fUniformHandles.fRTAdjustmentUni =
             fProgramBuilder->addUniform(GrGLProgramBuilder::kVertex_Visibility,
                                         kVec4f_GrSLType,
-                                        "rtAdjustment",
-                                        &rtAdjustName);
+                                        fProgramBuilder->rtAdjustment(),
+                                        &fRtAdjustName);
+    // Wire transforms
+    SkTArray<GrGLProgramBuilder::TransformVarying, true>& transVs = fProgramBuilder->fCoordVaryings;
+    int transformCount = transVs.count();
+    for (int i = 0; i < transformCount; i++) {
+        const char* coords = transVs[i].fSourceCoords.c_str();
+
+        // varying = matrix * coords (logically)
+        const GrGLVarying& v = transVs[i].fV;
+        if (kVec2f_GrSLType == v.fType) {
+            this->codeAppendf("%s = (%s * vec3(%s, 1)).xy;", v.fVsOut, transVs[i].fUniName.c_str(),
+                              coords);
+        } else {
+            this->codeAppendf("%s = %s * vec3(%s, 1);", v.fVsOut, transVs[i].fUniName.c_str(),
+                              coords);
+        }
+    }
 
     // Transform from Skia's device coords to GL's normalized device coords.
-    this->codeAppendf("gl_Position = vec4(dot(pos3.xz, %s.xy), dot(pos3.yz, %s.zw), 0, pos3.z);",
-                    rtAdjustName, rtAdjustName);
+    this->codeAppendf("gl_Position = vec4(dot(%s.xz, %s.xy), dot(%s.yz, %s.zw), 0, %s.z);",
+                      this->glPosition(), fRtAdjustName, this->glPosition(), fRtAdjustName,
+                      this->glPosition());
 }
 
 void GrGLVertexBuilder::bindVertexAttributes(GrGLuint programID) {
     // Bind the attrib locations to same values for all shaders
     const GrProgramDesc::KeyHeader& header = fProgramBuilder->header();
     SkASSERT(-1 != header.fPositionAttributeIndex);
     GL_CALL(BindAttribLocation(programID,
                                header.fPositionAttributeIndex,
                                fPositionVar->c_str()));
     if (-1 != header.fLocalCoordAttributeIndex) {
@@ skipping 62 matching lines @@
     for (int i = 0; i < fInputs.count(); ++i) {
         const GrGLShaderVar& attr = fInputs[i];
         // if attribute already added, don't add it again
         if (attr.getName().equals(var.getName())) {
             return false;
         }
     }
     fInputs.push_back(var);
     return true;
 }