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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 GrGLProgramDesc_DEFINED
#define GrGLProgramDesc_DEFINED
#include "GrColor.h"
#include "GrProgramDesc.h"
#include "GrGpu.h"
#include "GrTypesPriv.h"
class GrGpuGL;
/**
* This class can be used to build a GrProgramDesc. It also provides helpers for accessing
* GL specific info in the header.
*/
class GrGLProgramDescBuilder {
public:
struct GLKeyHeader : public GrProgramDesc::KeyHeader {
SkBool8 fUseNvpr;
};
// The key, stored in fKey, is composed of five parts(first 2 are defined in the key itself):
// 1. uint32_t for total key length.
// 2. uint32_t for a checksum.
// 3. Header struct defined above.
// 4. An array of offsets to effect keys and their sizes (see 5). uint16_t for each
// offset and size.
// 5. per-effect keys. Each effect's key is a variable length array of uint32_t.
enum {
// Part 3.
kHeaderOffset = GrProgramDesc::kHeaderOffset,
kHeaderSize = SkAlign4(sizeof(GLKeyHeader)),
// Part 4.
// This is the offset in the overall key to the array of per-effect offset,length pairs.
kProcessorKeyOffsetsAndLengthOffset = kHeaderOffset + kHeaderSize,
};
/**
* Builds a GL specific program descriptor
*
* @param GrOptDrawState The optimized drawstate. The descriptor will represent a program
* which this optstate can use to draw with. The optstate contains
* general draw information, as well as the specific color, geometry,
* and coverage stages which will be used to generate the GL Program for
* this optstate.
* @param DescInfo A descriptor info struct, generated by the optstate, which contains a number
* of important facts about the program the built descriptor will represent
* @param DrawType
* @param GrGpuGL A GL Gpu, the caps and Gpu object are used to output processor specific
* parts of the descriptor.
* @param GrDeviceCoordTexture A dstCopy texture, which may be null if frame buffer fetch is
* supported
* @param GrProgramDesc The built and finalized descriptor
**/
static bool Build(const GrOptDrawState&,
const GrProgramDesc::DescInfo&,
GrGpu::DrawType,
GrGpuGL*,
const GrDeviceCoordTexture*,
GrProgramDesc*);
static const GLKeyHeader& GetHeader(const GrProgramDesc& desc) {
return *desc.atOffset<GLKeyHeader, kHeaderOffset>();
}
private:
template <class ProcessorKeyBuilder>
static bool BuildStagedProcessorKey(const typename ProcessorKeyBuilder::StagedProcessor& stage,
const GrGLCaps& caps,
bool requiresLocalCoordAttrib,
GrProgramDesc* desc,
int* offsetAndSizeIndex);
};
#endif
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