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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#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.)
*/
enum GrSLType {
kVoid_GrSLType,
kFloat_GrSLType,
kVec2f_GrSLType,
kVec3f_GrSLType,
kVec4f_GrSLType,
kMat33f_GrSLType,
kMat44f_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) {
SkASSERT(type >= 0 && type < static_cast<GrSLType>(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);
}
/** Return the type enum for a vector of floats of length n (1..4),
e.g. 1 -> kFloat_GrSLType, 2 -> kVec2_GrSLType, ... */
static inline GrSLType GrSLFloatVectorType(int count) {
SkASSERT(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.
*/
enum GrVertexAttribType {
kFloat_GrVertexAttribType = 0,
kVec2f_GrVertexAttribType,
kVec3f_GrVertexAttribType,
kVec4f_GrVertexAttribType,
kVec4ub_GrVertexAttribType, // vector of 4 unsigned bytes, e.g. colors
kLast_GrVertexAttribType = kVec4ub_GrVertexAttribType
};
static const int kGrVertexAttribTypeCount = kLast_GrVertexAttribType + 1;
/**
* Returns the vector size of the type.
*/
static inline int GrVertexAttribTypeVectorCount(GrVertexAttribType type) {
SkASSERT(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) {
SkASSERT(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 inline int GrFixedFunctionVertexAttribVectorCount(GrVertexAttribBinding binding) {
SkASSERT(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, GrVertexAttribBinding binding) {
fType = type;
fOffset = offset;
fBinding = binding;
}
bool operator==(const GrVertexAttrib& other) const {
return fType == other.fType && fOffset == other.fOffset && fBinding == other.fBinding;
};
bool operator!=(const GrVertexAttrib& other) const { return !(*this == other); }
GrVertexAttribType fType;
size_t fOffset;
GrVertexAttribBinding fBinding;
};
template <int N> class GrVertexAttribArray : public SkSTArray<N, GrVertexAttrib, true> {};
#endif
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