| |
| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| |
| #ifndef GrGpu_DEFINED |
| #define GrGpu_DEFINED |
| |
| #include "GrDrawTarget.h" |
| #include "GrRect.h" |
| #include "GrRefCnt.h" |
| #include "GrClipMaskManager.h" |
| |
| #include "SkPath.h" |
| |
| class GrContext; |
| class GrIndexBufferAllocPool; |
| class GrPath; |
| class GrPathRenderer; |
| class GrPathRendererChain; |
| class GrResource; |
| class GrStencilBuffer; |
| class GrVertexBufferAllocPool; |
| |
| class GrGpu : public GrDrawTarget { |
| |
| public: |
| |
| /** |
| * Additional blend coefficients for dual source blending, not exposed |
| * through GrPaint/GrContext. |
| */ |
| enum ExtendedBlendCoeffs { |
| // source 2 refers to second output color when |
| // using dual source blending. |
| kS2C_GrBlendCoeff = kPublicGrBlendCoeffCount, |
| kIS2C_GrBlendCoeff, |
| kS2A_GrBlendCoeff, |
| kIS2A_GrBlendCoeff, |
| |
| kTotalGrBlendCoeffCount |
| }; |
| |
| /** |
| * Create an instance of GrGpu that matches the specified backend. If the requested backend is |
| * not supported (at compile-time or run-time) this returns NULL. |
| */ |
| static GrGpu* Create(GrBackend, GrBackendContext); |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| GrGpu(); |
| virtual ~GrGpu(); |
| |
| // The GrContext sets itself as the owner of this Gpu object |
| void setContext(GrContext* context) { |
| GrAssert(NULL == fContext); |
| fContext = context; |
| fClipMaskManager.setContext(context); |
| } |
| GrContext* getContext() { return fContext; } |
| const GrContext* getContext() const { return fContext; } |
| |
| /** |
| * The GrGpu object normally assumes that no outsider is setting state |
| * within the underlying 3D API's context/device/whatever. This call informs |
| * the GrGpu that the state was modified and it shouldn't make assumptions |
| * about the state. |
| */ |
| void markContextDirty() { fContextIsDirty = true; } |
| |
| void unimpl(const char[]); |
| |
| /** |
| * Creates a texture object. If desc width or height is not a power of |
| * two but underlying API requires a power of two texture then srcData |
| * will be embedded in a power of two texture. The extra width and height |
| * is filled as though srcData were rendered clamped into the texture. |
| * |
| * If kRenderTarget_TextureFlag is specified the GrRenderTarget is |
| * accessible via GrTexture::asRenderTarget(). The texture will hold a ref |
| * on the render target until its releaseRenderTarget() is called or it is |
| * destroyed. |
| * |
| * @param desc describes the texture to be created. |
| * @param srcData texel data to load texture. Begins with full-size |
| * palette data for paletted textures. Contains width* |
| * height texels. If NULL texture data is uninitialized. |
| * |
| * @return The texture object if successful, otherwise NULL. |
| */ |
| GrTexture* createTexture(const GrTextureDesc& desc, |
| const void* srcData, size_t rowBytes); |
| |
| /** |
| * Implements GrContext::wrapBackendTexture |
| */ |
| GrTexture* wrapBackendTexture(const GrBackendTextureDesc&); |
| |
| /** |
| * Implements GrContext::wrapBackendTexture |
| */ |
| GrRenderTarget* wrapBackendRenderTarget(const GrBackendRenderTargetDesc&); |
| |
| /** |
| * Creates a vertex buffer. |
| * |
| * @param size size in bytes of the vertex buffer |
| * @param dynamic hints whether the data will be frequently changed |
| * by either GrVertexBuffer::lock or |
| * GrVertexBuffer::updateData. |
| * |
| * @return The vertex buffer if successful, otherwise NULL. |
| */ |
| GrVertexBuffer* createVertexBuffer(uint32_t size, bool dynamic); |
| |
| /** |
| * Creates an index buffer. |
| * |
| * @param size size in bytes of the index buffer |
| * @param dynamic hints whether the data will be frequently changed |
| * by either GrIndexBuffer::lock or |
| * GrIndexBuffer::updateData. |
| * |
| * @return The index buffer if successful, otherwise NULL. |
| */ |
| GrIndexBuffer* createIndexBuffer(uint32_t size, bool dynamic); |
| |
| /** |
| * Creates a path object that can be stenciled using stencilPath(). It is |
| * only legal to call this if the caps report support for path stenciling. |
| */ |
| GrPath* createPath(const SkPath& path); |
| |
| /** |
| * Returns an index buffer that can be used to render quads. |
| * Six indices per quad: 0, 1, 2, 0, 2, 3, etc. |
| * The max number of quads can be queried using GrIndexBuffer::maxQuads(). |
| * Draw with kTriangles_GrPrimitiveType |
| * @ return the quad index buffer |
| */ |
| const GrIndexBuffer* getQuadIndexBuffer() const; |
| |
| /** |
| * Returns a vertex buffer with four position-only vertices [(0,0), (1,0), |
| * (1,1), (0,1)]. |
| * @ return unit square vertex buffer |
| */ |
| const GrVertexBuffer* getUnitSquareVertexBuffer() const; |
| |
| /** |
| * Resolves MSAA. |
| */ |
| void resolveRenderTarget(GrRenderTarget* target); |
| |
| /** |
| * Ensures that the current render target is actually set in the |
| * underlying 3D API. Used when client wants to use 3D API to directly |
| * render to the RT. |
| */ |
| void forceRenderTargetFlush(); |
| |
| /** |
| * readPixels with some configs may be slow. Given a desired config this |
| * function returns a fast-path config. The returned config must have the |
| * same components and component sizes. The caller is free to ignore the |
| * result and call readPixels with the original config. |
| */ |
| virtual GrPixelConfig preferredReadPixelsConfig(GrPixelConfig config) |
| const { |
| return config; |
| } |
| |
| /** |
| * Same as above but applies to writeTexturePixels |
| */ |
| virtual GrPixelConfig preferredWritePixelsConfig(GrPixelConfig config) |
| const { |
| return config; |
| } |
| |
| /** |
| * OpenGL's readPixels returns the result bottom-to-top while the skia |
| * API is top-to-bottom. Thus we have to do a y-axis flip. The obvious |
| * solution is to have the subclass do the flip using either the CPU or GPU. |
| * However, the caller (GrContext) may have transformations to apply and can |
| * simply fold in the y-flip for free. On the other hand, the subclass may |
| * be able to do it for free itself. For example, the subclass may have to |
| * do memcpys to handle rowBytes that aren't tight. It could do the y-flip |
| * concurrently. |
| * |
| * This function returns true if a y-flip is required to put the pixels in |
| * top-to-bottom order and the subclass cannot do it for free. |
| * |
| * See read pixels for the params |
| * @return true if calling readPixels with the same set of params will |
| * produce bottom-to-top data |
| */ |
| virtual bool readPixelsWillPayForYFlip(GrRenderTarget* renderTarget, |
| int left, int top, |
| int width, int height, |
| GrPixelConfig config, |
| size_t rowBytes) const = 0; |
| /** |
| * This should return true if reading a NxM rectangle of pixels from a |
| * render target is faster if the target has dimensons N and M and the read |
| * rectangle has its top-left at 0,0. |
| */ |
| virtual bool fullReadPixelsIsFasterThanPartial() const { return false; }; |
| |
| /** |
| * Reads a rectangle of pixels from a render target. |
| * |
| * @param renderTarget the render target to read from. NULL means the |
| * current render target. |
| * @param left left edge of the rectangle to read (inclusive) |
| * @param top top edge of the rectangle to read (inclusive) |
| * @param width width of rectangle to read in pixels. |
| * @param height height of rectangle to read in pixels. |
| * @param config the pixel config of the destination buffer |
| * @param buffer memory to read the rectangle into. |
| * @param rowBytes the number of bytes between consecutive rows. Zero |
| * means rows are tightly packed. |
| * @param invertY buffer should be populated bottom-to-top as opposed |
| * to top-to-bottom (skia's usual order) |
| * |
| * @return true if the read succeeded, false if not. The read can fail |
| * because of a unsupported pixel config or because no render |
| * target is currently set. |
| */ |
| bool readPixels(GrRenderTarget* renderTarget, |
| int left, int top, int width, int height, |
| GrPixelConfig config, void* buffer, size_t rowBytes, |
| bool invertY); |
| |
| /** |
| * Updates the pixels in a rectangle of a texture. |
| * |
| * @param left left edge of the rectangle to write (inclusive) |
| * @param top top edge of the rectangle to write (inclusive) |
| * @param width width of rectangle to write in pixels. |
| * @param height height of rectangle to write in pixels. |
| * @param config the pixel config of the source buffer |
| * @param buffer memory to read pixels from |
| * @param rowBytes number of bytes between consecutive rows. Zero |
| * means rows are tightly packed. |
| */ |
| void writeTexturePixels(GrTexture* texture, |
| int left, int top, int width, int height, |
| GrPixelConfig config, const void* buffer, |
| size_t rowBytes); |
| |
| /** |
| * Called to tell Gpu object that all GrResources have been lost and should |
| * be abandoned. Overrides must call INHERITED::abandonResources(). |
| */ |
| virtual void abandonResources(); |
| |
| /** |
| * Called to tell Gpu object to release all GrResources. Overrides must call |
| * INHERITED::releaseResources(). |
| */ |
| void releaseResources(); |
| |
| /** |
| * Add resource to list of resources. Should only be called by GrResource. |
| * @param resource the resource to add. |
| */ |
| void insertResource(GrResource* resource); |
| |
| /** |
| * Remove resource from list of resources. Should only be called by |
| * GrResource. |
| * @param resource the resource to remove. |
| */ |
| void removeResource(GrResource* resource); |
| |
| // GrDrawTarget overrides |
| virtual void clear(const GrIRect* rect, |
| GrColor color, |
| GrRenderTarget* renderTarget = NULL) SK_OVERRIDE; |
| |
| virtual void purgeResources() SK_OVERRIDE { |
| // The clip mask manager can rebuild all its clip masks so just |
| // get rid of them all. |
| fClipMaskManager.releaseResources(); |
| } |
| |
| // After the client interacts directly with the 3D context state the GrGpu |
| // must resync its internal state and assumptions about 3D context state. |
| // Each time this occurs the GrGpu bumps a timestamp. |
| // state of the 3D context |
| // At 10 resets / frame and 60fps a 64bit timestamp will overflow in about |
| // a billion years. |
| typedef uint64_t ResetTimestamp; |
| |
| // This timestamp is always older than the current timestamp |
| static const ResetTimestamp kExpiredTimestamp = 0; |
| // Returns a timestamp based on the number of times the context was reset. |
| // This timestamp can be used to lazily detect when cached 3D context state |
| // is dirty. |
| ResetTimestamp getResetTimestamp() const { |
| return fResetTimestamp; |
| } |
| |
| /** |
| * Can the provided configuration act as a color render target? |
| */ |
| bool isConfigRenderable(GrPixelConfig config) const { |
| GrAssert(kGrPixelConfigCount > config); |
| return fConfigRenderSupport[config]; |
| } |
| |
| /** |
| * These methods are called by the clip manager's setupClipping function |
| * which (called as part of GrGpu's implementation of onDraw and |
| * onStencilPath member functions.) The GrGpu subclass should flush the |
| * stencil state to the 3D API in its implementation of flushGraphicsState. |
| */ |
| void enableScissor(const GrIRect& rect) { |
| fScissorState.fEnabled = true; |
| fScissorState.fRect = rect; |
| } |
| void disableScissor() { fScissorState.fEnabled = false; } |
| |
| /** |
| * Like the scissor methods above this is called by setupClipping and |
| * should be flushed by the GrGpu subclass in flushGraphicsState. These |
| * stencil settings should be used in place of those on the GrDrawState. |
| * They have been adjusted to account for any interactions between the |
| * GrDrawState's stencil settings and stencil clipping. |
| */ |
| void setStencilSettings(const GrStencilSettings& settings) { |
| fStencilSettings = settings; |
| } |
| void disableStencil() { fStencilSettings.setDisabled(); } |
| |
| // GrGpu subclass sets clip bit in the stencil buffer. The subclass is |
| // free to clear the remaining bits to zero if masked clears are more |
| // expensive than clearing all bits. |
| virtual void clearStencilClip(const GrIRect& rect, bool insideClip) = 0; |
| |
| enum PrivateDrawStateStateBits { |
| kFirstBit = (GrDrawState::kLastPublicStateBit << 1), |
| |
| kModifyStencilClip_StateBit = kFirstBit, // allows draws to modify |
| // stencil bits used for |
| // clipping. |
| }; |
| |
| protected: |
| enum DrawType { |
| kDrawPoints_DrawType, |
| kDrawLines_DrawType, |
| kDrawTriangles_DrawType, |
| kStencilPath_DrawType, |
| }; |
| |
| DrawType PrimTypeToDrawType(GrPrimitiveType type) { |
| switch (type) { |
| case kTriangles_GrPrimitiveType: |
| case kTriangleStrip_GrPrimitiveType: |
| case kTriangleFan_GrPrimitiveType: |
| return kDrawTriangles_DrawType; |
| case kPoints_GrPrimitiveType: |
| return kDrawPoints_DrawType; |
| case kLines_GrPrimitiveType: |
| case kLineStrip_GrPrimitiveType: |
| return kDrawLines_DrawType; |
| default: |
| GrCrash("Unexpected primitive type"); |
| return kDrawTriangles_DrawType; |
| } |
| } |
| |
| // prepares clip flushes gpu state before a draw |
| bool setupClipAndFlushState(DrawType); |
| |
| // Functions used to map clip-respecting stencil tests into normal |
| // stencil funcs supported by GPUs. |
| static GrStencilFunc ConvertStencilFunc(bool stencilInClip, |
| GrStencilFunc func); |
| static void ConvertStencilFuncAndMask(GrStencilFunc func, |
| bool clipInStencil, |
| unsigned int clipBit, |
| unsigned int userBits, |
| unsigned int* ref, |
| unsigned int* mask); |
| |
| GrClipMaskManager fClipMaskManager; |
| |
| struct GeometryPoolState { |
| const GrVertexBuffer* fPoolVertexBuffer; |
| int fPoolStartVertex; |
| |
| const GrIndexBuffer* fPoolIndexBuffer; |
| int fPoolStartIndex; |
| }; |
| const GeometryPoolState& getGeomPoolState() { |
| return fGeomPoolStateStack.back(); |
| } |
| |
| // The state of the scissor is controlled by the clip manager |
| struct ScissorState { |
| bool fEnabled; |
| GrIRect fRect; |
| } fScissorState; |
| |
| // The final stencil settings to use as determined by the clip manager. |
| GrStencilSettings fStencilSettings; |
| |
| // Derived classes need access to this so they can fill it out in their |
| // constructors |
| bool fConfigRenderSupport[kGrPixelConfigCount]; |
| |
| // Helpers for setting up geometry state |
| void finalizeReservedVertices(); |
| void finalizeReservedIndices(); |
| |
| private: |
| // GrDrawTarget overrides |
| virtual bool onReserveVertexSpace(size_t vSize, int vertexCount, void** vertices) SK_OVERRIDE; |
| virtual bool onReserveIndexSpace(int indexCount, void** indices) SK_OVERRIDE; |
| virtual void releaseReservedVertexSpace() SK_OVERRIDE; |
| virtual void releaseReservedIndexSpace() SK_OVERRIDE; |
| virtual void onSetVertexSourceToArray(const void* vertexArray, int vertexCount) SK_OVERRIDE; |
| virtual void onSetIndexSourceToArray(const void* indexArray, int indexCount) SK_OVERRIDE; |
| virtual void releaseVertexArray() SK_OVERRIDE; |
| virtual void releaseIndexArray() SK_OVERRIDE; |
| virtual void geometrySourceWillPush() SK_OVERRIDE; |
| virtual void geometrySourceWillPop(const GeometrySrcState& restoredState) SK_OVERRIDE; |
| |
| |
| // called when the 3D context state is unknown. Subclass should emit any |
| // assumed 3D context state and dirty any state cache. |
| virtual void onResetContext() = 0; |
| |
| // overridden by backend-specific derived class to create objects. |
| virtual GrTexture* onCreateTexture(const GrTextureDesc& desc, |
| const void* srcData, |
| size_t rowBytes) = 0; |
| virtual GrTexture* onWrapBackendTexture(const GrBackendTextureDesc&) = 0; |
| virtual GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&) = 0; |
| virtual GrVertexBuffer* onCreateVertexBuffer(uint32_t size, bool dynamic) = 0; |
| virtual GrIndexBuffer* onCreateIndexBuffer(uint32_t size, bool dynamic) = 0; |
| virtual GrPath* onCreatePath(const SkPath& path) = 0; |
| |
| // overridden by backend-specific derived class to perform the clear and |
| // clearRect. NULL rect means clear whole target. |
| virtual void onClear(const GrIRect* rect, GrColor color) = 0; |
| |
| // overridden by backend-specific derived class to perform the draw call. |
| virtual void onGpuDraw(const DrawInfo&) = 0; |
| // when GrDrawTarget::stencilPath is called the draw state's current stencil |
| // settings are ignored. Instead the GrGpu decides the stencil rules |
| // necessary to stencil the path. These are still subject to filtering by |
| // the clip mask manager. |
| virtual void setStencilPathSettings(const GrPath&, |
| SkPath::FillType, |
| GrStencilSettings* settings) = 0; |
| // overridden by backend-specific derived class to perform the path stenciling. |
| virtual void onGpuStencilPath(const GrPath*, SkPath::FillType) = 0; |
| |
| // overridden by backend-specific derived class to perform flush |
| virtual void onForceRenderTargetFlush() = 0; |
| |
| // overridden by backend-specific derived class to perform the read pixels. |
| virtual bool onReadPixels(GrRenderTarget* target, |
| int left, int top, int width, int height, |
| GrPixelConfig, |
| void* buffer, |
| size_t rowBytes, |
| bool invertY) = 0; |
| |
| // overridden by backend-specific derived class to perform the texture update |
| virtual void onWriteTexturePixels(GrTexture* texture, |
| int left, int top, int width, int height, |
| GrPixelConfig config, const void* buffer, |
| size_t rowBytes) = 0; |
| |
| // overridden by backend-specific derived class to perform the resolve |
| virtual void onResolveRenderTarget(GrRenderTarget* target) = 0; |
| |
| // width and height may be larger than rt (if underlying API allows it). |
| // Should attach the SB to the RT. Returns false if compatible sb could |
| // not be created. |
| virtual bool createStencilBufferForRenderTarget(GrRenderTarget*, int width, int height) = 0; |
| |
| // attaches an existing SB to an existing RT. |
| virtual bool attachStencilBufferToRenderTarget(GrStencilBuffer*, GrRenderTarget*) = 0; |
| |
| // The GrGpu typically records the clients requested state and then flushes |
| // deltas from previous state at draw time. This function does the |
| // backend-specific flush of the state |
| // returns false if current state is unsupported. |
| virtual bool flushGraphicsState(DrawType) = 0; |
| |
| // clears the entire stencil buffer to 0 |
| virtual void clearStencil() = 0; |
| |
| // Given a rt, find or create a stencil buffer and attach it |
| bool attachStencilBufferToRenderTarget(GrRenderTarget* target); |
| |
| // GrDrawTarget overrides |
| virtual void onDraw(const DrawInfo&) SK_OVERRIDE; |
| virtual void onStencilPath(const GrPath* path, const SkStrokeRec& stroke, |
| SkPath::FillType) SK_OVERRIDE; |
| |
| // readies the pools to provide vertex/index data. |
| void prepareVertexPool(); |
| void prepareIndexPool(); |
| |
| void resetContext() { |
| // We call this because the client may have messed with the |
| // stencil buffer. Perhaps we should detect whether it is a |
| // internally created stencil buffer and if so skip the invalidate. |
| fClipMaskManager.invalidateStencilMask(); |
| this->onResetContext(); |
| ++fResetTimestamp; |
| } |
| |
| void handleDirtyContext() { |
| if (fContextIsDirty) { |
| this->resetContext(); |
| fContextIsDirty = false; |
| } |
| } |
| |
| enum { |
| kPreallocGeomPoolStateStackCnt = 4, |
| }; |
| typedef SkTInternalLList<GrResource> ResourceList; |
| SkSTArray<kPreallocGeomPoolStateStackCnt, GeometryPoolState, true> fGeomPoolStateStack; |
| GrContext* fContext; // not reffed |
| ResetTimestamp fResetTimestamp; |
| GrVertexBufferAllocPool* fVertexPool; |
| GrIndexBufferAllocPool* fIndexPool; |
| // counts number of uses of vertex/index pool in the geometry stack |
| int fVertexPoolUseCnt; |
| int fIndexPoolUseCnt; |
| // these are mutable so they can be created on-demand |
| mutable GrVertexBuffer* fUnitSquareVertexBuffer; |
| mutable GrIndexBuffer* fQuadIndexBuffer; |
| bool fContextIsDirty; |
| ResourceList fResourceList; |
| |
| typedef GrDrawTarget INHERITED; |
| }; |
| |
| #endif |
