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* Copyright 2019 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef GrGpuBuffer_DEFINED
#define GrGpuBuffer_DEFINED
#include "GrBuffer.h"
#include "GrGpuResource.h"
class GrGpu;
class GrGpuBuffer : public GrGpuResource, public GrBuffer {
* Computes a scratch key for a GPU-side buffer with a "dynamic" access pattern. (Buffers with
* "static" and "stream" patterns are disqualified by nature from being cached and reused.)
static void ComputeScratchKeyForDynamicVBO(size_t size, GrGpuBufferType, GrScratchKey*);
GrAccessPattern accessPattern() const { return fAccessPattern; }
size_t size() const final { return fSizeInBytes; }
void ref() const final { GrGpuResource::ref(); }
void unref() const final { GrGpuResource::unref(); }
* Maps the buffer to be written by the CPU.
* The previous content of the buffer is invalidated. It is an error
* to draw from the buffer while it is mapped. It may fail if the backend
* doesn't support mapping the buffer. If the buffer is CPU backed then
* it will always succeed and is a free operation. Once a buffer is mapped,
* subsequent calls to map() are ignored.
* Note that buffer mapping does not go through GrContext and therefore is
* not serialized with other operations.
* @return a pointer to the data or nullptr if the map fails.
void* map() {
if (!fMapPtr) {
return fMapPtr;
* Unmaps the buffer.
* The pointer returned by the previous map call will no longer be valid.
void unmap() {
fMapPtr = nullptr;
Queries whether the buffer has been mapped.
@return true if the buffer is mapped, false otherwise.
bool isMapped() const { return SkToBool(fMapPtr); }
bool isCpuBuffer() const final { return false; }
* Updates the buffer data.
* The size of the buffer will be preserved. The src data will be
* placed at the beginning of the buffer and any remaining contents will
* be undefined. srcSizeInBytes must be <= to the buffer size.
* The buffer must not be mapped.
* Note that buffer updates do not go through GrContext and therefore are
* not serialized with other operations.
* @return returns true if the update succeeds, false otherwise.
bool updateData(const void* src, size_t srcSizeInBytes) {
SkASSERT(srcSizeInBytes <= fSizeInBytes);
return this->onUpdateData(src, srcSizeInBytes);
GrGpuBuffer(GrGpu*, size_t sizeInBytes, GrGpuBufferType, GrAccessPattern);
GrGpuBufferType intendedType() const { return fIntendedType; }
void* fMapPtr;
virtual void onMap() = 0;
virtual void onUnmap() = 0;
virtual bool onUpdateData(const void* src, size_t srcSizeInBytes) = 0;
size_t onGpuMemorySize() const override { return fSizeInBytes; }
const char* getResourceType() const override { return "Buffer Object"; }
void computeScratchKey(GrScratchKey* key) const override;
size_t fSizeInBytes;
GrAccessPattern fAccessPattern;
GrGpuBufferType fIntendedType;