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/*
* 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 GrGpuCommandBuffer_DEFINED
#define GrGpuCommandBuffer_DEFINED
#include "GrColor.h"
#include "GrPipeline.h"
#include "ops/GrDrawOp.h"
class GrOpFlushState;
class GrFixedClip;
class GrGpu;
class GrMesh;
class GrPipeline;
class GrPrimitiveProcessor;
class GrRenderTarget;
struct SkIRect;
struct SkRect;
class GrGpuRTCommandBuffer;
class GrGpuCommandBuffer {
public:
virtual ~GrGpuCommandBuffer() {}
// Copy src into current surface owned by either a GrGpuTextureCommandBuffer or
// GrGpuRenderTargetCommandBuffer.
virtual void copy(GrSurface* src, GrSurfaceOrigin srcOrigin,
const SkIRect& srcRect, const SkIPoint& dstPoint) = 0;
virtual void insertEventMarker(const char*) = 0;
virtual GrGpuRTCommandBuffer* asRTCommandBuffer() { return nullptr; }
// Sends the command buffer off to the GPU object to execute the commands built up in the
// buffer. The gpu object is allowed to defer execution of the commands until it is flushed.
virtual void submit() = 0;
protected:
GrGpuCommandBuffer(GrSurfaceOrigin origin) : fOrigin(origin) {}
GrSurfaceOrigin fOrigin;
};
class GrGpuTextureCommandBuffer : public GrGpuCommandBuffer{
public:
virtual ~GrGpuTextureCommandBuffer() {}
virtual void submit() = 0;
protected:
GrGpuTextureCommandBuffer(GrTexture* texture, GrSurfaceOrigin origin)
: INHERITED(origin)
, fTexture(texture) {}
GrTexture* fTexture;
private:
typedef GrGpuCommandBuffer INHERITED;
};
/**
* The GrGpuRenderTargetCommandBuffer is a series of commands (draws, clears, and discards), which
* all target the same render target. It is possible that these commands execute immediately (GL),
* or get buffered up for later execution (Vulkan). GrOps will execute their draw commands into a
* GrGpuCommandBuffer.
*/
class GrGpuRTCommandBuffer : public GrGpuCommandBuffer {
public:
struct LoadAndStoreInfo {
GrLoadOp fLoadOp;
GrStoreOp fStoreOp;
GrColor fClearColor;
};
// Load-time clears of the stencil buffer are always to 0 so we don't store
// an 'fStencilClearValue'
struct StencilLoadAndStoreInfo {
GrLoadOp fLoadOp;
GrStoreOp fStoreOp;
};
virtual ~GrGpuRTCommandBuffer() {}
GrGpuRTCommandBuffer* asRTCommandBuffer() { return this; }
virtual void begin() = 0;
// Signals the end of recording to the command buffer and that it can now be submitted.
virtual void end() = 0;
// We pass in an array of meshCount GrMesh to the draw. The backend should loop over each
// GrMesh object and emit a draw for it. Each draw will use the same GrPipeline and
// GrPrimitiveProcessor. This may fail if the draw would exceed any resource limits (e.g.
// number of vertex attributes is too large).
bool draw(const GrPipeline&,
const GrPrimitiveProcessor&,
const GrMesh[],
const GrPipeline::DynamicState[],
int meshCount,
const SkRect& bounds);
// Performs an upload of vertex data in the middle of a set of a set of draws
virtual void inlineUpload(GrOpFlushState*, GrDrawOp::DeferredUploadFn&) = 0;
/**
* Clear the owned render target. Ignores the draw state and clip.
*/
void clear(const GrFixedClip&, GrColor);
void clearStencilClip(const GrFixedClip&, bool insideStencilMask);
/**
* Discards the contents render target.
*/
// TODO: This should be removed in the future to favor using the load and store ops for discard
virtual void discard() = 0;
protected:
GrGpuRTCommandBuffer(GrRenderTarget* rt, GrSurfaceOrigin origin)
: INHERITED(origin)
, fRenderTarget(rt) {
}
GrRenderTarget* fRenderTarget;
private:
virtual GrGpu* gpu() = 0;
// overridden by backend-specific derived class to perform the draw call.
virtual void onDraw(const GrPipeline&,
const GrPrimitiveProcessor&,
const GrMesh[],
const GrPipeline::DynamicState[],
int meshCount,
const SkRect& bounds) = 0;
// overridden by backend-specific derived class to perform the clear.
virtual void onClear(const GrFixedClip&, GrColor) = 0;
virtual void onClearStencilClip(const GrFixedClip&, bool insideStencilMask) = 0;
typedef GrGpuCommandBuffer INHERITED;
};
#endif
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