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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrProgramDesc_DEFINED
#define GrProgramDesc_DEFINED
#include "GrColor.h"
#include "GrTypesPriv.h"
#include "SkOpts.h"
#include "SkTArray.h"
class GrShaderCaps;
class GrPipeline;
class GrPrimitiveProcessor;
/** This class describes a program to generate. It also serves as a program cache key */
class GrProgramDesc {
public:
// Creates an uninitialized key that must be populated by GrGpu::buildProgramDesc()
GrProgramDesc() {}
/**
* Builds a program descriptor. Before the descriptor can be used, the client must call finalize
* on the returned GrProgramDesc.
*
* @param GrPrimitiveProcessor The geometry
* @param hasPointSize Controls whether the shader will output a point size.
* @param GrPipeline 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 GrShaderCaps Capabilities of the shading language.
* @param GrProgramDesc The built and finalized descriptor
**/
static bool Build(GrProgramDesc*,
const GrPrimitiveProcessor&,
bool hasPointSize,
const GrPipeline&,
const GrShaderCaps&);
// Returns this as a uint32_t array to be used as a key in the program cache.
const uint32_t* asKey() const {
return reinterpret_cast<const uint32_t*>(fKey.begin());
}
// Gets the number of bytes in asKey(). It will be a 4-byte aligned value. When comparing two
// keys the size of either key can be used with memcmp() since the lengths themselves begin the
// keys and thus the memcmp will exit early if the keys are of different lengths.
uint32_t keyLength() const { return *this->atOffset<uint32_t, kLengthOffset>(); }
// Gets the a checksum of the key. Can be used as a hash value for a fast lookup in a cache.
uint32_t getChecksum() const { return *this->atOffset<uint32_t, kChecksumOffset>(); }
GrProgramDesc& operator= (const GrProgramDesc& other) {
uint32_t keyLength = other.keyLength();
fKey.reset(SkToInt(keyLength));
memcpy(fKey.begin(), other.fKey.begin(), keyLength);
return *this;
}
bool operator== (const GrProgramDesc& that) const {
SkASSERT(SkIsAlign4(this->keyLength()));
int l = this->keyLength() >> 2;
const uint32_t* aKey = this->asKey();
const uint32_t* bKey = that.asKey();
for (int i = 0; i < l; ++i) {
if (aKey[i] != bKey[i]) {
return false;
}
}
return true;
}
bool operator!= (const GrProgramDesc& other) const {
return !(*this == other);
}
static bool Less(const GrProgramDesc& a, const GrProgramDesc& b) {
SkASSERT(SkIsAlign4(a.keyLength()));
int l = a.keyLength() >> 2;
const uint32_t* aKey = a.asKey();
const uint32_t* bKey = b.asKey();
for (int i = 0; i < l; ++i) {
if (aKey[i] != bKey[i]) {
return aKey[i] < bKey[i] ? true : false;
}
}
return false;
}
struct KeyHeader {
// Set to uniquely identify the sample pattern, or 0 if the shader doesn't use sample
// locations.
uint8_t fSamplePatternKey;
// Set to uniquely idenitify any swizzling of the shader's output color(s).
uint8_t fOutputSwizzle;
uint8_t fColorFragmentProcessorCnt : 4;
uint8_t fCoverageFragmentProcessorCnt : 4;
// Set to uniquely identify the rt's origin, or 0 if the shader does not require this info.
uint8_t fSurfaceOriginKey : 2;
uint8_t fIgnoresCoverage : 1;
uint8_t fSnapVerticesToPixelCenters : 1;
uint8_t fHasPointSize : 1;
uint8_t fPad : 3;
};
GR_STATIC_ASSERT(sizeof(KeyHeader) == 4);
// This should really only be used internally, base classes should return their own headers
const KeyHeader& header() const { return *this->atOffset<KeyHeader, kHeaderOffset>(); }
void finalize() {
int keyLength = fKey.count();
SkASSERT(0 == (keyLength % 4));
*(this->atOffset<uint32_t, GrProgramDesc::kLengthOffset>()) = SkToU32(keyLength);
uint32_t* checksum = this->atOffset<uint32_t, GrProgramDesc::kChecksumOffset>();
*checksum = 0; // We'll hash through these bytes, so make sure they're initialized.
*checksum = SkOpts::hash(fKey.begin(), keyLength);
}
protected:
template<typename T, size_t OFFSET> T* atOffset() {
return reinterpret_cast<T*>(reinterpret_cast<intptr_t>(fKey.begin()) + OFFSET);
}
template<typename T, size_t OFFSET> const T* atOffset() const {
return reinterpret_cast<const T*>(reinterpret_cast<intptr_t>(fKey.begin()) + OFFSET);
}
// The key, stored in fKey, is composed of four parts:
// 1. uint32_t for total key length.
// 2. uint32_t for a checksum.
// 3. Header struct defined above.
// 4. A Backend specific payload which includes the per-processor keys.
enum KeyOffsets {
// Part 1.
kLengthOffset = 0,
// Part 2.
kChecksumOffset = kLengthOffset + sizeof(uint32_t),
// Part 3.
kHeaderOffset = kChecksumOffset + sizeof(uint32_t),
kHeaderSize = SkAlign4(sizeof(KeyHeader)),
// Part 4.
// This is the offset into the backenend specific part of the key, which includes
// per-processor keys.
kProcessorKeysOffset = kHeaderOffset + kHeaderSize,
};
enum {
kMaxPreallocProcessors = 8,
kIntsPerProcessor = 4, // This is an overestimate of the average effect key size.
kPreAllocSize = kHeaderOffset + kHeaderSize +
kMaxPreallocProcessors * sizeof(uint32_t) * kIntsPerProcessor,
};
SkSTArray<kPreAllocSize, uint8_t, true>& key() { return fKey; }
const SkSTArray<kPreAllocSize, uint8_t, true>& key() const { return fKey; }
private:
SkSTArray<kPreAllocSize, uint8_t, true> fKey;
};
#endif
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