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Unified Diff: src/gpu/GrBuffer.h

Issue 1870893002: Implement texel buffers (Closed) Base URL: https://skia.googlesource.com/skia.git@upload_texelfetch
Patch Set: GrBuffer(Access) into include/gpu Created 4 years, 8 months ago
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Index: src/gpu/GrBuffer.h
diff --git a/src/gpu/GrBuffer.h b/src/gpu/GrBuffer.h
deleted file mode 100644
index 7e04577543f2922a816c7199081d740c676297a4..0000000000000000000000000000000000000000
--- a/src/gpu/GrBuffer.h
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrBuffer_DEFINED
-#define GrBuffer_DEFINED
-
-#include "GrGpuResource.h"
-
-class GrGpu;
-
-class GrBuffer : public GrGpuResource {
-public:
- /**
- * Computes a scratch key for a buffer with a "dynamic" access pattern. (Buffers with "static"
- * and "stream" access patterns are disqualified by nature from being cached and reused.)
- */
- static void ComputeScratchKeyForDynamicBuffer(size_t size, GrBufferType intendedType,
- GrScratchKey* key) {
- static const GrScratchKey::ResourceType kType = GrScratchKey::GenerateResourceType();
- GrScratchKey::Builder builder(key, kType, 1 + (sizeof(size_t) + 3) / 4);
- // TODO: There's not always reason to cache a buffer by type. In some (all?) APIs it's just
- // a chunk of memory we can use/reuse for any type of data. We really only need to
- // differentiate between the "read" types (e.g. kGpuToCpu_BufferType) and "draw" types.
- builder[0] = intendedType;
- builder[1] = (uint32_t)size;
- if (sizeof(size_t) > 4) {
- builder[2] = (uint32_t)((uint64_t)size >> 32);
- }
- }
-
- GrAccessPattern accessPattern() const { return fAccessPattern; }
-
- /**
- * Returns true if the buffer is a wrapper around a CPU array. If true it
- * indicates that map will always succeed and will be free.
- */
- bool isCPUBacked() const { return fCPUBacked; }
-
- /**
- * 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) {
- this->onMap();
- }
- return fMapPtr;
- }
-
- /**
- * Unmaps the buffer.
- *
- * The pointer returned by the previous map call will no longer be valid.
- */
- void unmap() {
- SkASSERT(fMapPtr);
- this->onUnmap();
- fMapPtr = nullptr;
- }
-
- /**
- * Returns the same ptr that map() returned at time of map or nullptr if the
- * is not mapped.
- *
- * @return ptr to mapped buffer data or nullptr if buffer is not mapped.
- */
- void* mapPtr() const { return fMapPtr; }
-
- /**
- Queries whether the buffer has been mapped.
-
- @return true if the buffer is mapped, false otherwise.
- */
- bool isMapped() const { return SkToBool(fMapPtr); }
-
- /**
- * 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(!this->isMapped());
- SkASSERT(srcSizeInBytes <= fGpuMemorySize);
- return this->onUpdateData(src, srcSizeInBytes);
- }
-
-protected:
- GrBuffer(GrGpu* gpu, size_t gpuMemorySize, GrBufferType intendedType,
- GrAccessPattern accessPattern, bool cpuBacked)
- : INHERITED(gpu, kCached_LifeCycle),
- fMapPtr(nullptr),
- fGpuMemorySize(gpuMemorySize), // TODO: Zero for cpu backed buffers?
- fAccessPattern(accessPattern),
- fCPUBacked(cpuBacked) {
- if (!fCPUBacked && SkIsPow2(fGpuMemorySize) && kDynamic_GrAccessPattern == fAccessPattern) {
- GrScratchKey key;
- ComputeScratchKeyForDynamicBuffer(fGpuMemorySize, intendedType, &key);
- this->setScratchKey(key);
- }
- }
-
- void* fMapPtr;
-
-private:
- virtual size_t onGpuMemorySize() const { return fGpuMemorySize; }
-
- virtual void onMap() = 0;
- virtual void onUnmap() = 0;
- virtual bool onUpdateData(const void* src, size_t srcSizeInBytes) = 0;
-
- size_t fGpuMemorySize;
- GrAccessPattern fAccessPattern;
- bool fCPUBacked;
-
- typedef GrGpuResource INHERITED;
-};
-
-#endif
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