Revise attribute binding interface.

Replace the old attribute binding and index interface with one where we include the binding as part of the attribute array. Also removed the fixed attribute indices for constant color and coverage attributes, and replaced with dynamic ones based on current attribute set. Removed binding of color and coverage attributes unless they're actually set.

Original author: bsalomon@google.com

Author: jvanverth@google.com

Reviewed By: bsalomon@google.com,robertphillips@google.com

Review URL: https://chromiumcodereview.appspot.com/13296005

git-svn-id: http://skia.googlecode.com/svn/trunk@8466 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 120 insertions, 12 deletions

diff --git a/include/gpu/GrTypesPriv.h b/include/gpu/GrTypesPriv.h
index ebe28dee09..5a3c386763 100644
--- a/include/gpu/GrTypesPriv.h
+++ b/include/gpu/GrTypesPriv.h
@@ -8,12 +8,12 @@
 #ifndef GrTypesPriv_DEFINED
 #define GrTypesPriv_DEFINED
 
+#include "GrTypes.h"
 #include "SkTArray.h"
 
 /**
- * Types of shader-language-specific boxed variables we can create.
- * (Currently only GrGLShaderVars, but should be applicable to other shader
- * languages.)
+ * Types of shader-language-specific boxed variables we can create. (Currently only GrGLShaderVars,
+ * but should be applicable to other shader languages.)
  */
 enum GrSLType {
     kVoid_GrSLType,
@@ -23,11 +23,43 @@ enum GrSLType {
     kVec4f_GrSLType,
     kMat33f_GrSLType,
     kMat44f_GrSLType,
-    kSampler2D_GrSLType
+    kSampler2D_GrSLType,
+
+    kLast_GrSLType = kSampler2D_GrSLType
 };
+static const int kGrSLTypeCount = kLast_GrSLType + 1;
+
+/**
+ * Gets the vector size of the SLType. Returns -1 for void, matrices, and samplers.
+ */
+static inline int GrSLTypeVectorCount(GrSLType type) {
+    GrAssert(type >= 0 && type < kGrSLTypeCount);
+    static const int kCounts[] = { -1, 1, 2, 3, 4, -1, -1, -1 };
+    return kCounts[type];
+
+    GR_STATIC_ASSERT(0 == kVoid_GrSLType);
+    GR_STATIC_ASSERT(1 == kFloat_GrSLType);
+    GR_STATIC_ASSERT(2 == kVec2f_GrSLType);
+    GR_STATIC_ASSERT(3 == kVec3f_GrSLType);
+    GR_STATIC_ASSERT(4 == kVec4f_GrSLType);
+    GR_STATIC_ASSERT(5 == kMat33f_GrSLType);
+    GR_STATIC_ASSERT(6 == kMat44f_GrSLType);
+    GR_STATIC_ASSERT(7 == kSampler2D_GrSLType);
+    GR_STATIC_ASSERT(GR_ARRAY_COUNT(kCounts) == kGrSLTypeCount);
+}
+
+static inline GrSLType GrSLFloatVectorType(int count) {
+    GrAssert(count > 0 && count <= 4);
+    return (GrSLType)(count);
+
+    GR_STATIC_ASSERT(kFloat_GrSLType == 1);
+    GR_STATIC_ASSERT(kVec2f_GrSLType == 2);
+    GR_STATIC_ASSERT(kVec3f_GrSLType == 3);
+    GR_STATIC_ASSERT(kVec4f_GrSLType == 4);
+}
 
 /**
- * Types used to describe format of vertices in arrays
+ * Types used to describe format of vertices in arrays.
   */
 enum GrVertexAttribType {
     kFloat_GrVertexAttribType = 0,
@@ -40,20 +72,96 @@ enum GrVertexAttribType {
 };
 static const int kGrVertexAttribTypeCount = kLast_GrVertexAttribType + 1;
 
+/**
+ * Returns the vector size of the type.
+ */
+static inline int GrVertexAttribTypeVectorCount(GrVertexAttribType type) {
+    GrAssert(type >= 0 && type < kGrVertexAttribTypeCount);
+    static const int kCounts[] = { 1, 2, 3, 4, 4 };
+    return kCounts[type];
+
+    GR_STATIC_ASSERT(0 == kFloat_GrVertexAttribType);
+    GR_STATIC_ASSERT(1 == kVec2f_GrVertexAttribType);
+    GR_STATIC_ASSERT(2 == kVec3f_GrVertexAttribType);
+    GR_STATIC_ASSERT(3 == kVec4f_GrVertexAttribType);
+    GR_STATIC_ASSERT(4 == kVec4ub_GrVertexAttribType);
+    GR_STATIC_ASSERT(GR_ARRAY_COUNT(kCounts) == kGrVertexAttribTypeCount);
+}
+
+/**
+ * Returns the size of the attrib type in bytes.
+ */
+static inline size_t GrVertexAttribTypeSize(GrVertexAttribType type) {
+    GrAssert(type >= 0 && type < kGrVertexAttribTypeCount);
+    static const size_t kSizes[] = {
+        sizeof(float),          // kFloat_GrVertexAttribType
+        2*sizeof(float),        // kVec2f_GrVertexAttribType
+        3*sizeof(float),        // kVec3f_GrVertexAttribType
+        4*sizeof(float),        // kVec4f_GrVertexAttribType
+        4*sizeof(char)          // kVec4ub_GrVertexAttribType
+    };
+    return kSizes[type];
+
+    GR_STATIC_ASSERT(0 == kFloat_GrVertexAttribType);
+    GR_STATIC_ASSERT(1 == kVec2f_GrVertexAttribType);
+    GR_STATIC_ASSERT(2 == kVec3f_GrVertexAttribType);
+    GR_STATIC_ASSERT(3 == kVec4f_GrVertexAttribType);
+    GR_STATIC_ASSERT(4 == kVec4ub_GrVertexAttribType);
+    GR_STATIC_ASSERT(GR_ARRAY_COUNT(kSizes) == kGrVertexAttribTypeCount);
+}
+
+/**
+ * Semantic bindings for vertex attributes. kEffect means that the attribute is input to a GrEffect.
+ * Each binding other than kEffect may not appear more than once in the current set of attributes.
+ * kPosition must be appear for exactly one attribute.
+ */
+enum GrVertexAttribBinding {
+    kPosition_GrVertexAttribBinding,    // required, must have vector count of 2
+    kLocalCoord_GrVertexAttribBinding,  // must have vector count of 2
+    kColor_GrVertexAttribBinding,       // must have vector count of 4
+    kCoverage_GrVertexAttribBinding,    // must have vector count of 4
+
+    kLastFixedFunction_GrVertexAttribBinding = kCoverage_GrVertexAttribBinding,
+
+    kEffect_GrVertexAttribBinding,      // vector length must agree with
+                                        // GrEffect::vertexAttribType() for each effect input to
+                                        // which the attribute is mapped by GrDrawState::setEffect()
+    kLast_GrVertexAttribBinding = kEffect_GrVertexAttribBinding
+};
+
+static const int kGrVertexAttribBindingCnt = kLast_GrVertexAttribBinding + 1;
+static const int kGrFixedFunctionVertexAttribBindingCnt =
+    kLastFixedFunction_GrVertexAttribBinding + 1;
+
+static const int GrFixedFunctionVertexAttribVectorCount(GrVertexAttribBinding binding) {
+    GrAssert(binding >= 0 && binding < kGrFixedFunctionVertexAttribBindingCnt);
+    static const int kVecCounts[] = { 2, 2, 4, 4 };
+
+    return kVecCounts[binding];
+
+    GR_STATIC_ASSERT(0 == kPosition_GrVertexAttribBinding);
+    GR_STATIC_ASSERT(1 == kLocalCoord_GrVertexAttribBinding);
+    GR_STATIC_ASSERT(2 == kColor_GrVertexAttribBinding);
+    GR_STATIC_ASSERT(3 == kCoverage_GrVertexAttribBinding);
+    GR_STATIC_ASSERT(kGrFixedFunctionVertexAttribBindingCnt == SK_ARRAY_COUNT(kVecCounts));
+}
+
 struct GrVertexAttrib {
-    inline void set(GrVertexAttribType type, size_t offset) {
-        fType = type; fOffset = offset;
+    inline void set(GrVertexAttribType type, size_t offset, GrVertexAttribBinding binding) {
+        fType = type;
+        fOffset = offset;
+        fBinding = binding;
     }
     bool operator==(const GrVertexAttrib& other) const {
-        return fType == other.fType && fOffset == other.fOffset;
+        return fType == other.fType && fOffset == other.fOffset && fBinding == other.fBinding;
     };
     bool operator!=(const GrVertexAttrib& other) const { return !(*this == other); }
 
-    GrVertexAttribType fType;
-    size_t             fOffset;
+    GrVertexAttribType      fType;
+    size_t                  fOffset;
+    GrVertexAttribBinding   fBinding;
 };
 
-template <int N>
-class GrVertexAttribArray : public SkSTArray<N, GrVertexAttrib, true> {};
+template <int N> class GrVertexAttribArray : public SkSTArray<N, GrVertexAttrib, true> {};
 
 #endif