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/*
* Copyright 2021 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrDrawIndirectCommand_DEFINED
#define GrDrawIndirectCommand_DEFINED
#include <stdint.h>
#include <utility>
struct GrDrawIndirectCommand {
uint32_t fVertexCount;
uint32_t fInstanceCount;
int32_t fBaseVertex;
uint32_t fBaseInstance;
};
static_assert(sizeof(GrDrawIndirectCommand) == 16, "GrDrawIndirectCommand must be tightly packed");
struct GrDrawIndexedIndirectCommand {
uint32_t fIndexCount;
uint32_t fInstanceCount;
uint32_t fBaseIndex;
int32_t fBaseVertex;
uint32_t fBaseInstance;
};
static_assert(sizeof(GrDrawIndexedIndirectCommand) == 20,
"GrDrawIndexedIndirectCommand must be tightly packed");
// Helper for writing commands to an indirect draw buffer. Usage:
//
// GrDrawIndirectWriter indirectWriter = target->makeDrawIndirectSpace(...);
// indirectWriter.write(...);
// indirectWriter.write(...);
struct GrDrawIndirectWriter {
public:
GrDrawIndirectWriter() = default;
GrDrawIndirectWriter(void* data) : fData(static_cast<GrDrawIndirectCommand*>(data)) {}
GrDrawIndirectWriter(const GrDrawIndirectWriter&) = delete;
GrDrawIndirectWriter(GrDrawIndirectWriter&& that) { *this = std::move(that); }
GrDrawIndirectWriter& operator=(const GrDrawIndirectWriter&) = delete;
GrDrawIndirectWriter& operator=(GrDrawIndirectWriter&& that) {
fData = that.fData;
that.fData = nullptr;
return *this;
}
bool operator==(const GrDrawIndirectWriter& that) { return fData == that.fData; }
explicit operator bool() const { return fData != nullptr; }
GrDrawIndirectWriter makeOffset(int drawCount) const { return {fData + drawCount}; }
inline void write(uint32_t instanceCount, uint32_t baseInstance, uint32_t vertexCount,
int32_t baseVertex) {
*fData++ = {vertexCount, instanceCount, baseVertex, baseInstance};
}
private:
GrDrawIndirectCommand* fData;
};
// Helper for writing commands to an indexed indirect draw buffer. Usage:
//
// GrDrawIndexedIndirectWriter indirectWriter = target->makeDrawIndexedIndirectSpace(...);
// indirectWriter.writeIndexed(...);
// indirectWriter.writeIndexed(...);
struct GrDrawIndexedIndirectWriter {
public:
GrDrawIndexedIndirectWriter() = default;
GrDrawIndexedIndirectWriter(void* data)
: fData(static_cast<GrDrawIndexedIndirectCommand*>(data)) {}
GrDrawIndexedIndirectWriter(const GrDrawIndexedIndirectWriter&) = delete;
GrDrawIndexedIndirectWriter(GrDrawIndexedIndirectWriter&& that) { *this = std::move(that); }
GrDrawIndexedIndirectWriter& operator=(const GrDrawIndexedIndirectWriter&) = delete;
GrDrawIndexedIndirectWriter& operator=(GrDrawIndexedIndirectWriter&& that) {
fData = that.fData;
that.fData = nullptr;
return *this;
}
bool operator==(const GrDrawIndexedIndirectWriter& that) { return fData == that.fData; }
explicit operator bool() const { return fData != nullptr; }
GrDrawIndexedIndirectWriter makeOffset(int drawCount) const { return {fData + drawCount}; }
inline void writeIndexed(uint32_t indexCount, uint32_t baseIndex, uint32_t instanceCount,
uint32_t baseInstance, int32_t baseVertex) {
*fData++ = {indexCount, instanceCount, baseIndex, baseVertex, baseInstance};
}
private:
GrDrawIndexedIndirectCommand* fData;
};
#endif