8fe72477f2
Add lostContext() to GrContext. Review URL: http://codereview.appspot.com/4328044/ git-svn-id: http://skia.googlecode.com/svn/trunk@1026 2bbb7eff-a529-9590-31e7-b0007b416f81
614 lines
23 KiB
C++
614 lines
23 KiB
C++
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef GrGpu_DEFINED
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#define GrGpu_DEFINED
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#include "GrRect.h"
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#include "GrRefCnt.h"
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#include "GrDrawTarget.h"
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#include "GrTexture.h"
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#include "GrPathRenderer.h"
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class GrVertexBufferAllocPool;
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class GrIndexBufferAllocPool;
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class GrResource;
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class GrGpu : public GrDrawTarget {
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public:
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/**
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* Possible 3D APIs that may be used by Ganesh.
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*/
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enum Engine {
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kOpenGL_Shaders_Engine,
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kOpenGL_Fixed_Engine,
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kDirect3D9_Engine
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};
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/**
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* Platform specific 3D context.
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* For
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* kOpenGL_Shaders_Engine use NULL
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* kOpenGL_Fixed_Engine use NULL
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* kDirect3D9_Engine use an IDirect3DDevice9*
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*/
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typedef void* Platform3DContext;
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/**
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* Create an instance of GrGpu that matches the specified Engine backend.
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* If the requested engine is not supported (at compile-time or run-time)
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* this returns NULL.
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*/
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static GrGpu* Create(Engine, Platform3DContext context3D);
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/**
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* Used to control the level of antialiasing available for a rendertarget.
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* Anti-alias quality levels depend on the underlying API/GPU capabilities.
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*/
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enum AALevels {
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kNone_AALevel, //<! No antialiasing available.
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kLow_AALevel, //<! Low quality antialiased rendering. Actual
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// interpretation is platform-dependent.
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kMed_AALevel, //<! Medium quality antialiased rendering. Actual
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// interpretation is platform-dependent.
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kHigh_AALevel, //<! High quality antialiased rendering. Actual
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// interpretation is platform-dependent.
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};
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/**
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* Optional bitfield flags that can be passed to createTexture.
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*/
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enum TextureFlags {
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kRenderTarget_TextureFlag = 0x1, //<! Creates a texture that can be
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// rendered to by calling
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// GrGpu::setRenderTarget() with
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// GrTexture::asRenderTarget().
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kNoStencil_TextureFlag = 0x2, //<! If the texture is used as a
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// rendertarget but a stencil
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// buffer is not required. Stencil
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// may be required for clipping and
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// path rendering.
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kDynamicUpdate_TextureFlag = 0x4 //!< Hint that the CPU may modify
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// this texture after creation
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};
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enum {
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/**
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* For Index8 pixel config, the colortable must be 256 entries
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*/
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kColorTableSize = 256 * sizeof(GrColor)
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};
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/**
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* Describes a texture to be created.
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*/
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struct TextureDesc {
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uint32_t fFlags; //!< bitfield of TextureFlags
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GrGpu::AALevels fAALevel;//!< The level of antialiasing available
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// for a rendertarget texture. Only
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// flags contains
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// kRenderTarget_TextureFlag.
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uint32_t fWidth; //!< Width of the texture
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uint32_t fHeight; //!< Height of the texture
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GrTexture::PixelConfig fFormat; //!< Format of source data of the
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// texture. Not guaraunteed to be the
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// same as internal format used by
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// 3D API.
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};
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/**
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* Gpu usage statistics.
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*/
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struct Stats {
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uint32_t fVertexCnt; //<! Number of vertices drawn
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uint32_t fIndexCnt; //<! Number of indices drawn
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uint32_t fDrawCnt; //<! Number of draws
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uint32_t fProgChngCnt;//<! Number of program changes (N/A for fixed)
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/*
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* Number of times the texture is set in 3D API
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*/
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uint32_t fTextureChngCnt;
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/*
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* Number of times the render target is set in 3D API
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*/
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uint32_t fRenderTargetChngCnt;
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/*
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* Number of textures created (includes textures that are rendertargets).
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*/
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uint32_t fTextureCreateCnt;
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/*
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* Number of rendertargets created.
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*/
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uint32_t fRenderTargetCreateCnt;
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};
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////////////////////////////////////////////////////////////////////////////
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GrGpu();
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virtual ~GrGpu();
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/**
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* The GrGpu object normally assumes that no outsider is setting state
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* within the underlying 3D API's context/device/whatever. This call informs
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* the GrGpu that the state was modified and it shouldn't make assumptions
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* about the state.
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*/
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void markContextDirty() { fContextIsDirty = true; }
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void unimpl(const char[]);
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/**
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* Creates a texture object. If desc width or height is not a power of
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* two but underlying API requires a power of two texture then srcData
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* will be embedded in a power of two texture. The extra width and height
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* is filled as though srcData were rendered clamped into the texture.
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*
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* If kRenderTarget_TextureFlag is specified the GrRenderTarget is
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* accessible via GrTexture::asRenderTarget(). The texture will hold a ref
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* on the render target until its releaseRenderTarget() is called or it is
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* destroyed.
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*
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* @param desc describes the texture to be created.
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* @param srcData texel data to load texture. Begins with full-size
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* palette data for paletted textures. Contains width*
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* height texels. If NULL texture data is uninitialized.
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*
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* @return The texture object if successful, otherwise NULL.
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*/
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GrTexture* createTexture(const TextureDesc& desc,
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const void* srcData, size_t rowBytes);
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/**
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* Wraps an externally-created rendertarget in a GrRenderTarget.
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* @param platformRenderTarget handle to the the render target in the
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* underlying 3D API. Interpretation depends on
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* GrGpu subclass in use.
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* @param stencilBits number of stencil bits the target has
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* @param width width of the render target
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* @param height height of the render target
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*/
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virtual GrRenderTarget* createPlatformRenderTarget(
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intptr_t platformRenderTarget,
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int stencilBits,
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int width, int height);
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/**
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* Reads the current target object (e.g. FBO or IDirect3DSurface9*) and
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* viewport state from the underlying 3D API and wraps it in a
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* GrRenderTarget. The GrRenderTarget will not attempt to delete/destroy the
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* underlying object in its destructor and it is up to caller to guarantee
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* that it remains valid while the GrRenderTarget is used.
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*
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* @return the newly created GrRenderTarget
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*/
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GrRenderTarget* createRenderTargetFrom3DApiState();
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/**
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* Creates a vertex buffer.
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*
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* @param size size in bytes of the vertex buffer
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* @param dynamic hints whether the data will be frequently changed
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* by either GrVertexBuffer::lock or
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* GrVertexBuffer::updateData.
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*
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* @return The vertex buffer if successful, otherwise NULL.
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*/
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GrVertexBuffer* createVertexBuffer(uint32_t size, bool dynamic);
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/**
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* Creates an index buffer.
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*
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* @param size size in bytes of the index buffer
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* @param dynamic hints whether the data will be frequently changed
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* by either GrIndexBuffer::lock or
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* GrIndexBuffer::updateData.
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*
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* @return The index buffer if successful, otherwise NULL.
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*/
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GrIndexBuffer* createIndexBuffer(uint32_t size, bool dynamic);
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/**
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* Erase the entire render target, ignoring any clips/scissors.
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*
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* This is issued to the GPU driver immediately.
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*/
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void eraseColor(GrColor color);
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/**
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* Are 8 bit paletted textures supported.
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*
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* @return true if 8bit palette textures are supported, false otherwise
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*/
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bool supports8BitPalette() const { return f8bitPaletteSupport; }
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/**
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* returns true if two sided stenciling is supported. If false then only
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* the front face values of the GrStencilSettings
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* @return true if only a single stencil pass is needed.
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*/
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bool supportsTwoSidedStencil() const
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{ return fTwoSidedStencilSupport; }
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/**
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* returns true if stencil wrap is supported. If false then
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* kIncWrap_StencilOp and kDecWrap_StencilOp are treated as
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* kIncClamp_StencilOp and kDecClamp_StencilOp, respectively.
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* @return true if stencil wrap ops are supported.
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*/
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bool supportsStencilWrapOps() const
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{ return fStencilWrapOpsSupport; }
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/**
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* Checks whether locking vertex and index buffers is supported.
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*
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* @return true if locking is supported.
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*/
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bool supportsBufferLocking() const { return fBufferLockSupport; }
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/**
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* Gets the minimum width of a render target. If a texture/rt is created
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* with a width less than this size the GrGpu object will clamp it to this
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* value.
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*/
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int minRenderTargetWidth() const { return fMinRenderTargetWidth; }
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/**
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* Gets the minimum width of a render target. If a texture/rt is created
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* with a height less than this size the GrGpu object will clamp it to this
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* value.
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*/
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int minRenderTargetHeight() const { return fMinRenderTargetHeight; }
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/**
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* Returns true if NPOT textures can be created
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*
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* @return true if NPOT textures can be created
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*/
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bool npotTextureSupport() const { return fNPOTTextureSupport; }
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/**
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* Returns true if NPOT textures can be repeat/mirror tiled.
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*
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* @return true if NPOT textures can be tiled
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*/
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bool npotTextureTileSupport() const { return fNPOTTextureTileSupport; }
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/**
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* Returns true if a NPOT texture can be a rendertarget
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*
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* @return the true if NPOT texture/rendertarget can be created.
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*/
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bool npotRenderTargetSupport() const { return fNPOTRenderTargetSupport; }
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int maxTextureDimension() const { return fMaxTextureDimension; }
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// GrDrawTarget overrides
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virtual void drawIndexed(GrPrimitiveType type,
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int startVertex,
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int startIndex,
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int vertexCount,
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int indexCount);
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virtual void drawNonIndexed(GrPrimitiveType type,
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int startVertex,
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int vertexCount);
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/**
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* Installs a path renderer that will be used to draw paths that are
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* part of the clip.
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*/
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void setClipPathRenderer(GrPathRenderer* pathRenderer) {
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GrSafeAssign(fClientPathRenderer, pathRenderer);
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}
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/**
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* Returns an index buffer that can be used to render quads.
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* Six indices per quad: 0, 1, 2, 0, 2, 3, etc.
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* The max number of quads can be queried using GrIndexBuffer::maxQuads().
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* Draw with kTriangles_PrimitiveType
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* @ return the quad index buffer
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*/
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const GrIndexBuffer* getQuadIndexBuffer() const;
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/**
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* Returns a vertex buffer with four position-only vertices [(0,0), (1,0),
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* (1,1), (0,1)].
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* @ return unit square vertex buffer
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*/
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const GrVertexBuffer* getUnitSquareVertexBuffer() const;
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/**
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* Ensures that the current render target is actually set in the
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* underlying 3D API. Used when client wants to use 3D API to directly
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* render to the RT.
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*/
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void forceRenderTargetFlush();
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/**
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* Reads a rectangle of pixels from the current render target.
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* @param left left edge of the rectangle to read (inclusive)
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* @param top top edge of the rectangle to read (inclusive)
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* @param width width of rectangle to read in pixels.
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* @param height height of rectangle to read in pixels.
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* @param buffer memory to read the rectangle into.
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*
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* @return true if the read succeeded, false if not. The read can fail
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* because of a unsupported pixel config or because no render
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* target is currently set.
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*/
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bool readPixels(int left, int top, int width, int height,
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GrTexture::PixelConfig, void* buffer);
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const Stats& getStats() const;
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void resetStats();
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void printStats() const;
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/**
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* Called to tell Gpu object that all GrResources have been lost and should
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* be abandoned.
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*/
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void abandonResources();
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/**
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* Called to tell Gpu object to release all GrResources.
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*/
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void releaseResources();
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/**
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* Add resource to list of resources. Should only be called by GrResource.
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* @param resource the resource to add.
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*/
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void insertResource(GrResource* resource);
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/**
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* Remove resource from list of resources. Should only be called by
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* GrResource.
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* @param resource the resource to remove.
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*/
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void removeResource(GrResource* resource);
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protected:
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enum PrivateStateBits {
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kFirstBit = (kLastPublicStateBit << 1),
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kModifyStencilClip_StateBit = kFirstBit, // allows draws to modify
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// stencil bits used for
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// clipping.
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};
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/**
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* Extensions to GrDrawTarget::StateBits to implement stencil clipping
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*/
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struct ClipState {
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bool fClipInStencil;
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bool fClipIsDirty;
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} fClipState;
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// GrDrawTarget override
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virtual void clipWillBeSet(const GrClip& newClip);
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// prepares clip flushes gpu state before a draw
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bool setupClipAndFlushState(GrPrimitiveType type);
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// Functions used to map clip-respecting stencil tests into normal
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// stencil funcs supported by GPUs.
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static GrStencilFunc ConvertStencilFunc(bool stencilInClip,
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GrStencilFunc func);
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static void ConvertStencilFuncAndMask(GrStencilFunc func,
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bool clipInStencil,
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unsigned int clipBit,
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unsigned int userBits,
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unsigned int* ref,
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unsigned int* mask);
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// stencil settings to clip drawing when stencil clipping is in effect
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// and the client isn't using the stencil test.
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static const GrStencilSettings gClipStencilSettings;
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// defaults to false, subclass can set true to support palleted textures
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bool f8bitPaletteSupport;
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// set by subclass
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bool fNPOTTextureSupport;
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bool fNPOTTextureTileSupport;
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bool fNPOTRenderTargetSupport;
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bool fTwoSidedStencilSupport;
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bool fStencilWrapOpsSupport;
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// set by subclass to true if index and vertex buffers can be locked, false
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// otherwise.
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bool fBufferLockSupport;
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// set by subclass
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int fMinRenderTargetWidth;
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int fMinRenderTargetHeight;
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int fMaxTextureDimension;
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Stats fStats;
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const GrVertexBuffer* fCurrPoolVertexBuffer;
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int fCurrPoolStartVertex;
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const GrIndexBuffer* fCurrPoolIndexBuffer;
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int fCurrPoolStartIndex;
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// GrDrawTarget overrides
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virtual bool acquireGeometryHelper(GrVertexLayout vertexLayout,
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void** vertices,
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void** indices);
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virtual void releaseGeometryHelper();
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virtual void setVertexSourceToArrayHelper(const void* vertexArray,
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int vertexCount);
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virtual void setIndexSourceToArrayHelper(const void* indexArray,
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int indexCount);
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// Helpers for setting up geometry state
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void finalizeReservedVertices();
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void finalizeReservedIndices();
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// overridden by API-specific derived class to handle re-emitting 3D API
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// preample and dirtying state cache.
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virtual void resetContext() = 0;
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// overridden by API-specific derived class to create objects.
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virtual GrTexture* createTextureHelper(const TextureDesc& desc,
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const void* srcData,
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size_t rowBytes) = 0;
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virtual GrRenderTarget* createPlatformRenderTargetHelper(
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intptr_t platformRenderTarget,
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int stencilBits,
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int width, int height) = 0;
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virtual GrRenderTarget* createRenderTargetFrom3DApiStateHelper() = 0;
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virtual GrVertexBuffer* createVertexBufferHelper(uint32_t size,
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bool dynamic) = 0;
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virtual GrIndexBuffer* createIndexBufferHelper(uint32_t size,
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bool dynamic) = 0;
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// overridden by API-specific derivated class to perform the erase.
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virtual void eraseColorHelper(GrColor color) = 0;
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// overridden by API-specific derived class to perform the draw call.
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virtual void drawIndexedHelper(GrPrimitiveType type,
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uint32_t startVertex,
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uint32_t startIndex,
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uint32_t vertexCount,
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uint32_t indexCount) = 0;
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virtual void drawNonIndexedHelper(GrPrimitiveType type,
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uint32_t vertexCount,
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uint32_t numVertices) = 0;
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// overridden by API-specific derived class to perform flush
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virtual void forceRenderTargetFlushHelper() = 0;
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// overridden by API-specific derived class to perform the read pixels.
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virtual bool readPixelsHelper(int left, int top, int width, int height,
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GrTexture::PixelConfig, void* buffer) = 0;
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// called to program the vertex data, indexCount will be 0 if drawing non-
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// indexed geometry. The subclass may adjust the startVertex and/or
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// startIndex since it may have already accounted for these in the setup.
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virtual void setupGeometry(int* startVertex,
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int* startIndex,
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int vertexCount,
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int indexCount) = 0;
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// The GrGpu typically records the clients requested state and then flushes
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// deltas from previous state at draw time. This function does the
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// API-specific flush of the state
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// returns false if current state is unsupported.
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virtual bool flushGraphicsState(GrPrimitiveType type) = 0;
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// Sets the scissor rect, or disables if rect is NULL.
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virtual void flushScissor(const GrIRect* rect) = 0;
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// GrGpu subclass removes the clip from the stencil buffer
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virtual void eraseStencilClip(const GrIRect& rect) = 0;
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private:
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// readies the pools to provide vertex/index data.
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void prepareVertexPool();
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void prepareIndexPool();
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// determines the path renderer used to draw a clip path element.
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GrPathRenderer* getClipPathRenderer(GrPathIter* path,
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GrPathFill fill);
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void handleDirtyContext() {
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if (fContextIsDirty) {
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this->resetContext();
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fContextIsDirty = false;
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}
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}
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GrVertexBufferAllocPool* fVertexPool;
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|
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GrIndexBufferAllocPool* fIndexPool;
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|
|
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mutable GrIndexBuffer* fQuadIndexBuffer; // mutable so it can be
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|
// created on-demand
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|
|
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mutable GrVertexBuffer* fUnitSquareVertexBuffer; // mutable so it can be
|
|
// created on-demand
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|
|
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GrDefaultPathRenderer* fDefaultPathRenderer;
|
|
GrPathRenderer* fClientPathRenderer;
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|
|
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bool fContextIsDirty;
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|
|
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// when in an internal draw these indicate whether the pools are in use
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|
// by one of the outer draws. If false then it is safe to reset the
|
|
// pool.
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|
bool fVertexPoolInUse;
|
|
bool fIndexPoolInUse;
|
|
|
|
GrResource* fResourceHead;
|
|
|
|
// used to save and restore state when the GrGpu needs
|
|
// to make its geometry pools available internally
|
|
class AutoInternalDrawGeomRestore {
|
|
public:
|
|
AutoInternalDrawGeomRestore(GrGpu* gpu) : fAgsr(gpu) {
|
|
fGpu = gpu;
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|
|
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fVertexPoolWasInUse = gpu->fVertexPoolInUse;
|
|
fIndexPoolWasInUse = gpu->fIndexPoolInUse;
|
|
|
|
gpu->fVertexPoolInUse = fVertexPoolWasInUse ||
|
|
(kBuffer_GeometrySrcType !=
|
|
gpu->fGeometrySrc.fVertexSrc);
|
|
gpu->fIndexPoolInUse = fIndexPoolWasInUse ||
|
|
(kBuffer_GeometrySrcType !=
|
|
gpu->fGeometrySrc.fIndexSrc);;
|
|
|
|
fSavedPoolVertexBuffer = gpu->fCurrPoolVertexBuffer;
|
|
fSavedPoolStartVertex = gpu->fCurrPoolStartVertex;
|
|
fSavedPoolIndexBuffer = gpu->fCurrPoolIndexBuffer;
|
|
fSavedPoolStartIndex = gpu->fCurrPoolStartIndex;
|
|
|
|
fSavedReservedGeometry = gpu->fReservedGeometry;
|
|
gpu->fReservedGeometry.fLocked = false;
|
|
}
|
|
~AutoInternalDrawGeomRestore() {
|
|
fGpu->fCurrPoolVertexBuffer = fSavedPoolVertexBuffer;
|
|
fGpu->fCurrPoolStartVertex = fSavedPoolStartVertex;
|
|
fGpu->fCurrPoolIndexBuffer = fSavedPoolIndexBuffer;
|
|
fGpu->fCurrPoolStartIndex = fSavedPoolStartIndex;
|
|
fGpu->fVertexPoolInUse = fVertexPoolWasInUse;
|
|
fGpu->fIndexPoolInUse = fIndexPoolWasInUse;
|
|
fGpu->fReservedGeometry = fSavedReservedGeometry;
|
|
}
|
|
private:
|
|
AutoGeometrySrcRestore fAgsr;
|
|
GrGpu* fGpu;
|
|
const GrVertexBuffer* fSavedPoolVertexBuffer;
|
|
int fSavedPoolStartVertex;
|
|
const GrIndexBuffer* fSavedPoolIndexBuffer;
|
|
int fSavedPoolStartIndex;
|
|
bool fVertexPoolWasInUse;
|
|
bool fIndexPoolWasInUse;
|
|
ReservedGeometry fSavedReservedGeometry;
|
|
};
|
|
|
|
typedef GrDrawTarget INHERITED;
|
|
};
|
|
|
|
#endif
|