mirror of https://github.com/axmolengine/axmol.git
655 lines
25 KiB
C++
655 lines
25 KiB
C++
/*
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Copyright 2010 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 GrContext_DEFINED
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#define GrContext_DEFINED
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#include "GrClip.h"
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#include "GrTextureCache.h"
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#include "GrPaint.h"
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#include "GrPathRenderer.h"
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class GrFontCache;
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class GrGpu;
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struct GrGpuStats;
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class GrVertexBufferAllocPool;
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class GrIndexBufferAllocPool;
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class GrInOrderDrawBuffer;
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class GR_API GrContext : public GrRefCnt {
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public:
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/**
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* Creates a GrContext from within a 3D context.
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*/
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static GrContext* Create(GrEngine engine,
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GrPlatform3DContext context3D);
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/**
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* Helper to create a opengl-shader based context
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*/
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static GrContext* CreateGLShaderContext();
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virtual ~GrContext();
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/**
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* The GrContext 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 context that the state was modified and it should resend. Shouldn't
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* be called frequently for good performance.
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*/
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void resetContext();
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/**
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* Abandons all gpu resources, assumes 3D API state is unknown. Call this
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* if you have lost the associated GPU context, and thus internal texture,
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* buffer, etc. references/IDs are now invalid. Should be called even when
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* GrContext is no longer going to be used for two reasons:
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* 1) ~GrContext will not try to free the objects in the 3D API.
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* 2) If you've created GrResources that outlive the GrContext they will
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* be marked as invalid (GrResource::isValid()) and won't attempt to
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* free their underlying resource in the 3D API.
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* Content drawn since the last GrContext::flush() may be lost.
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*/
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void contextLost();
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/**
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* Similar to contextLost, but makes no attempt to reset state.
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* Use this method when GrContext destruction is pending, but
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* the graphics context is destroyed first.
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*/
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void contextDestroyed();
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/**
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* Frees gpu created by the context. Can be called to reduce GPU memory
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* pressure.
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*/
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void freeGpuResources();
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///////////////////////////////////////////////////////////////////////////
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// Textures
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/**
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* Search for an entry with the same Key. If found, "lock" it and return it.
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* If not found, return null.
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*/
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GrTextureEntry* findAndLockTexture(GrTextureKey*,
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const GrSamplerState&);
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/**
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* Create a new entry, based on the specified key and texture, and return
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* its "locked" entry.
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*
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* Ownership of the texture is transferred to the Entry, which will unref()
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* it when we are purged or deleted.
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*/
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GrTextureEntry* createAndLockTexture(GrTextureKey* key,
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const GrSamplerState&,
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const GrTextureDesc&,
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void* srcData, size_t rowBytes);
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/**
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* Returns a texture matching the desc. It's contents are unknown. Subsequent
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* requests with the same descriptor are not guaranteed to return the same
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* texture. The same texture is guaranteed not be returned again until it is
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* unlocked.
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*
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* Textures created by createAndLockTexture() hide the complications of
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* tiling non-power-of-two textures on APIs that don't support this (e.g.
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* unextended GLES2). Tiling a npot texture created by lockKeylessTexture on
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* such an API will create gaps in the tiling pattern. This includes clamp
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* mode. (This may be addressed in a future update.)
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*/
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GrTextureEntry* lockKeylessTexture(const GrTextureDesc& desc);
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/**
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* Finds a texture that approximately matches the descriptor. Will be
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* at least as large in width and height as desc specifies. If desc
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* specifies that texture is a render target then result will be a
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* render target. If desc specifies a render target and doesn't set the
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* no stencil flag then result will have a stencil. Format and aa level
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* will always match.
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*/
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GrTextureEntry* findApproximateKeylessTexture(const GrTextureDesc& desc);
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/**
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* When done with an entry, call unlockTexture(entry) on it, which returns
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* it to the cache, where it may be purged.
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*/
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void unlockTexture(GrTextureEntry* entry);
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/**
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* Creates a texture that is outside the cache. Does not count against
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* cache's budget.
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*/
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GrTexture* createUncachedTexture(const GrTextureDesc&,
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void* srcData,
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size_t rowBytes);
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/**
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* Returns true if the specified use of an indexed texture is supported.
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*/
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bool supportsIndex8PixelConfig(const GrSamplerState&, int width, int height);
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/**
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* Return the current texture cache limits.
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*
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* @param maxTextures If non-null, returns maximum number of textures that
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* can be held in the cache.
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* @param maxTextureBytes If non-null, returns maximum number of bytes of
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* texture memory that can be held in the cache.
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*/
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void getTextureCacheLimits(int* maxTextures, size_t* maxTextureBytes) const;
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/**
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* Specify the texture cache limits. If the current cache exceeds either
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* of these, it will be purged (LRU) to keep the cache within these limits.
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*
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* @param maxTextures The maximum number of textures that can be held in
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* the cache.
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* @param maxTextureBytes The maximum number of bytes of texture memory
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* that can be held in the cache.
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*/
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void setTextureCacheLimits(int maxTextures, size_t maxTextureBytes);
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/**
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* Return the max width or height of a texture supported by the current gpu
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*/
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int getMaxTextureSize() const;
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/**
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* Return the max width or height of a render target supported by the
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* current gpu
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*/
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int getMaxRenderTargetSize() const;
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///////////////////////////////////////////////////////////////////////////
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// Render targets
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/**
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* Sets the render target.
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* @param target the render target to set. (should not be NULL.)
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*/
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void setRenderTarget(GrRenderTarget* target);
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/**
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* Gets the current render target.
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* @return the currently bound render target. Should never be NULL.
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*/
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const GrRenderTarget* getRenderTarget() const;
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GrRenderTarget* getRenderTarget();
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///////////////////////////////////////////////////////////////////////////
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// Platform Surfaces
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// GrContext provides an interface for wrapping externally created textures
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// and rendertargets in their Gr-equivalents.
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/**
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* Wraps an existing 3D API surface in a GrObject. desc.fFlags determines
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* the type of object returned. If kIsTexture is set the returned object
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* will be a GrTexture*. Otherwise, it will be a GrRenderTarget*. If both
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* are set the render target object is accessible by
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* GrTexture::asRenderTarget().
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*
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* GL: if the object is a texture Gr may change its GL texture parameters
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* when it is drawn.
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*
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* @param desc description of the object to create.
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* @return either a GrTexture* or GrRenderTarget* depending on desc. NULL
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* on failure.
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*/
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GrResource* createPlatformSurface(const GrPlatformSurfaceDesc& desc);
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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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* Will not detect that the render target is also a texture. If you need
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* to also use the render target as a GrTexture use createPlatformSurface.
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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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// Matrix state
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/**
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* Gets the current transformation matrix.
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* @return the current matrix.
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*/
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const GrMatrix& getMatrix() const;
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/**
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* Sets the transformation matrix.
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* @param m the matrix to set.
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*/
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void setMatrix(const GrMatrix& m);
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/**
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* Concats the current matrix. The passed matrix is applied before the
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* current matrix.
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* @param m the matrix to concat.
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*/
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void concatMatrix(const GrMatrix& m) const;
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///////////////////////////////////////////////////////////////////////////
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// Clip state
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/**
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* Gets the current clip.
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* @return the current clip.
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*/
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const GrClip& getClip() const;
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/**
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* Sets the clip.
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* @param clip the clip to set.
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*/
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void setClip(const GrClip& clip);
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/**
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* Convenience method for setting the clip to a rect.
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* @param rect the rect to set as the new clip.
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*/
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void setClip(const GrIRect& rect);
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///////////////////////////////////////////////////////////////////////////
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// Draws
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/**
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* Clear the entire or rect of the render target, ignoring any clips.
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* @param rect the rect to clear or the whole thing if rect is NULL.
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* @param color the color to clear to.
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*/
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void clear(const GrIRect* rect, GrColor color);
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/**
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* Draw everywhere (respecting the clip) with the paint.
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*/
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void drawPaint(const GrPaint& paint);
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/**
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* Draw the rect using a paint.
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* @param paint describes how to color pixels.
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* @param strokeWidth If strokeWidth < 0, then the rect is filled, else
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* the rect is mitered stroked based on strokeWidth. If
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* strokeWidth == 0, then the stroke is always a single
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* pixel thick.
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* @param matrix Optional matrix applied to the rect. Applied before
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* context's matrix or the paint's matrix.
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* The rects coords are used to access the paint (through texture matrix)
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*/
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void drawRect(const GrPaint& paint,
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const GrRect&,
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GrScalar strokeWidth = -1,
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const GrMatrix* matrix = NULL);
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/**
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* Maps a rect of paint coordinates onto the a rect of destination
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* coordinates. Each rect can optionally be transformed. The srcRect
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* is stretched over the dstRect. The dstRect is transformed by the
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* context's matrix and the srcRect is transformed by the paint's matrix.
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* Additional optional matrices can be provided by parameters.
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*
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* @param paint describes how to color pixels.
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* @param dstRect the destination rect to draw.
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* @param srcRect rect of paint coordinates to be mapped onto dstRect
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* @param dstMatrix Optional matrix to transform dstRect. Applied before
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* context's matrix.
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* @param srcMatrix Optional matrix to transform srcRect Applied before
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* paint's matrix.
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*/
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void drawRectToRect(const GrPaint& paint,
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const GrRect& dstRect,
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const GrRect& srcRect,
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const GrMatrix* dstMatrix = NULL,
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const GrMatrix* srcMatrix = NULL);
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/**
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* Draws a path.
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*
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* @param paint describes how to color pixels.
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* @param path the path to draw
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* @param fill the path filling rule to use.
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* @param translate optional additional translation applied to the
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* path.
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*/
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void drawPath(const GrPaint& paint, const GrPath& path, GrPathFill fill,
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const GrPoint* translate = NULL);
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/**
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* Draws vertices with a paint.
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*
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* @param paint describes how to color pixels.
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* @param primitiveType primitives type to draw.
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* @param vertexCount number of vertices.
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* @param positions array of vertex positions, required.
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* @param texCoords optional array of texture coordinates used
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* to access the paint.
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* @param colors optional array of per-vertex colors, supercedes
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* the paint's color field.
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* @param indices optional array of indices. If NULL vertices
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* are drawn non-indexed.
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* @param indexCount if indices is non-null then this is the
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* number of indices.
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*/
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void drawVertices(const GrPaint& paint,
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GrPrimitiveType primitiveType,
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int vertexCount,
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const GrPoint positions[],
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const GrPoint texs[],
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const GrColor colors[],
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const uint16_t indices[],
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int indexCount);
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/**
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* Similar to drawVertices but caller provides objects that convert to Gr
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* types. The count of vertices is given by posSrc.
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*
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* @param paint describes how to color pixels.
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* @param primitiveType primitives type to draw.
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* @param posSrc Source of vertex positions. Must implement
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* int count() const;
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* void writeValue(int i, GrPoint* point) const;
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* count returns the total number of vertices and
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* writeValue writes a vertex position to point.
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* @param texSrc optional, pass NULL to not use explicit tex
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* coords. If present provides tex coords with
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* method:
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* void writeValue(int i, GrPoint* point) const;
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* @param texSrc optional, pass NULL to not use per-vertex colors
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* If present provides colors with method:
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* void writeValue(int i, GrColor* point) const;
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* @param indices optional, pass NULL for non-indexed drawing. If
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* present supplies indices for indexed drawing
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* with following methods:
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* int count() const;
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* void writeValue(int i, uint16_t* point) const;
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* count returns the number of indices and
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* writeValue supplies each index.
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*/
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template <typename POS_SRC,
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typename TEX_SRC,
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typename COL_SRC,
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typename IDX_SRC>
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void drawCustomVertices(const GrPaint& paint,
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GrPrimitiveType primitiveType,
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const POS_SRC& posSrc,
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const TEX_SRC* texCoordSrc,
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const COL_SRC* colorSrc,
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const IDX_SRC* idxSrc);
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/**
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* To avoid the problem of having to create a typename for NULL parameters,
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* these reduced versions of drawCustomVertices are provided.
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*/
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template <typename POS_SRC>
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void drawCustomVertices(const GrPaint& paint,
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GrPrimitiveType primitiveType,
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const POS_SRC& posSrc);
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template <typename POS_SRC, typename TEX_SRC>
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void drawCustomVertices(const GrPaint& paint,
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GrPrimitiveType primitiveType,
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const POS_SRC& posSrc,
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const TEX_SRC* texCoordSrc);
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template <typename POS_SRC, typename TEX_SRC, typename COL_SRC>
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void drawCustomVertices(const GrPaint& paint,
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GrPrimitiveType primitiveType,
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const POS_SRC& posSrc,
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const TEX_SRC* texCoordSrc,
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const COL_SRC* colorSrc);
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///////////////////////////////////////////////////////////////////////////
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// Misc.
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/**
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* Flags that affect flush() behavior.
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*/
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enum FlushBits {
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/**
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* A client may want Gr to bind a GrRenderTarget in the 3D API so that
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* it can be rendered to directly. However, Gr lazily sets state. Simply
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* calling setRenderTarget() followed by flush() without flags may not
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* bind the render target. This flag forces the context to bind the last
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* set render target in the 3D API.
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*/
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kForceCurrentRenderTarget_FlushBit = 0x1,
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/**
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* A client may reach a point where it has partially rendered a frame
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* through a GrContext that it knows the user will never see. This flag
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* causes the flush to skip submission of deferred content to the 3D API
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* during the flush.
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*/
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kDiscard_FlushBit = 0x2,
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};
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/**
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* Call to ensure all drawing to the context has been issued to the
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* underlying 3D API.
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* @param flagsBitfield flags that control the flushing behavior. See
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* FlushBits.
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*/
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void flush(int flagsBitfield = 0);
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/**
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* Reads a rectangle of pixels from a render target.
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* @param renderTarget the render target to read from. NULL means the
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* 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 config the pixel config of the destination buffer
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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 readRenderTargetPixels(GrRenderTarget* target,
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int left, int top, int width, int height,
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GrPixelConfig config, void* buffer);
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/**
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* Reads a rectangle of pixels from a texture.
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* @param texture the render target to read from.
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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 config the pixel config of the destination buffer
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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.
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*/
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bool readTexturePixels(GrTexture* target,
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int left, int top, int width, int height,
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GrPixelConfig config, void* buffer);
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/**
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* Copy the src pixels [buffer, stride, pixelconfig] into the current
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* render-target at the specified rectangle.
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*/
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void writePixels(int left, int top, int width, int height,
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GrPixelConfig, const void* buffer, size_t stride);
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///////////////////////////////////////////////////////////////////////////
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// Helpers
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class AutoRenderTarget : ::GrNoncopyable {
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public:
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AutoRenderTarget(GrContext* context, GrRenderTarget* target) {
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fContext = NULL;
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fPrevTarget = context->getRenderTarget();
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if (fPrevTarget != target) {
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context->setRenderTarget(target);
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fContext = context;
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}
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}
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~AutoRenderTarget() {
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if (fContext) {
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fContext->setRenderTarget(fPrevTarget);
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}
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}
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private:
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GrContext* fContext;
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GrRenderTarget* fPrevTarget;
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};
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///////////////////////////////////////////////////////////////////////////
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// Functions intended for internal use only.
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GrGpu* getGpu() { return fGpu; }
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GrFontCache* getFontCache() { return fFontCache; }
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GrDrawTarget* getTextTarget(const GrPaint& paint);
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void flushText();
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const GrIndexBuffer* getQuadIndexBuffer() const;
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void resetStats();
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const GrGpuStats& getStats() const;
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void printStats() const;
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private:
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// used to keep track of when we need to flush the draw buffer
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enum DrawCategory {
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kBuffered_DrawCategory, // last draw was inserted in draw buffer
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kUnbuffered_DrawCategory, // last draw was not inserted in the draw buffer
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kText_DrawCategory // text context was last to draw
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|
};
|
|
DrawCategory fLastDrawCategory;
|
|
|
|
GrGpu* fGpu;
|
|
GrTextureCache* fTextureCache;
|
|
GrFontCache* fFontCache;
|
|
|
|
GrPathRenderer* fCustomPathRenderer;
|
|
GrDefaultPathRenderer fDefaultPathRenderer;
|
|
|
|
GrVertexBufferAllocPool* fDrawBufferVBAllocPool;
|
|
GrIndexBufferAllocPool* fDrawBufferIBAllocPool;
|
|
GrInOrderDrawBuffer* fDrawBuffer;
|
|
|
|
GrIndexBuffer* fAAFillRectIndexBuffer;
|
|
GrIndexBuffer* fAAStrokeRectIndexBuffer;
|
|
int fMaxOffscreenAASize;
|
|
|
|
GrContext(GrGpu* gpu);
|
|
|
|
void fillAARect(GrDrawTarget* target,
|
|
const GrPaint& paint,
|
|
const GrRect& devRect);
|
|
|
|
void strokeAARect(GrDrawTarget* target,
|
|
const GrPaint& paint,
|
|
const GrRect& devRect,
|
|
const GrVec& devStrokeSize);
|
|
|
|
inline int aaFillRectIndexCount() const;
|
|
GrIndexBuffer* aaFillRectIndexBuffer();
|
|
|
|
inline int aaStrokeRectIndexCount() const;
|
|
GrIndexBuffer* aaStrokeRectIndexBuffer();
|
|
|
|
void setupDrawBuffer();
|
|
|
|
void flushDrawBuffer();
|
|
|
|
static void SetPaint(const GrPaint& paint, GrDrawTarget* target);
|
|
|
|
bool finalizeTextureKey(GrTextureKey*,
|
|
const GrSamplerState&,
|
|
bool keyless) const;
|
|
|
|
GrDrawTarget* prepareToDraw(const GrPaint& paint, DrawCategory drawType);
|
|
|
|
void drawClipIntoStencil();
|
|
|
|
GrPathRenderer* getPathRenderer(const GrDrawTarget*, const GrPath&, GrPathFill);
|
|
|
|
struct OffscreenRecord;
|
|
|
|
// determines whether offscreen AA should be applied
|
|
bool doOffscreenAA(GrDrawTarget* target,
|
|
const GrPaint& paint,
|
|
bool isLines) const;
|
|
|
|
// attempts to setup offscreen AA. All paint state must be transferred to
|
|
// target by the time this is called.
|
|
bool prepareForOffscreenAA(GrDrawTarget* target,
|
|
bool requireStencil,
|
|
const GrIRect& boundRect,
|
|
GrPathRenderer* pr,
|
|
OffscreenRecord* record);
|
|
|
|
// sets up target to draw coverage to the supersampled render target
|
|
void setupOffscreenAAPass1(GrDrawTarget* target,
|
|
const GrIRect& boundRect,
|
|
int tileX, int tileY,
|
|
OffscreenRecord* record);
|
|
|
|
// sets up target to sample coverage of supersampled render target back
|
|
// to the main render target using stage kOffscreenStage.
|
|
void doOffscreenAAPass2(GrDrawTarget* target,
|
|
const GrPaint& paint,
|
|
const GrIRect& boundRect,
|
|
int tileX, int tileY,
|
|
OffscreenRecord* record);
|
|
|
|
// restored the draw target state and releases offscreen target to cache
|
|
void cleanupOffscreenAA(GrDrawTarget* target,
|
|
GrPathRenderer* pr,
|
|
OffscreenRecord* record);
|
|
|
|
// computes vertex layout bits based on the paint. If paint expresses
|
|
// a texture for a stage, the stage coords will be bound to postitions
|
|
// unless hasTexCoords[s]==true in which case stage s's input coords
|
|
// are bound to tex coord index s. hasTexCoords == NULL is a shortcut
|
|
// for an array where all the values are false.
|
|
static int PaintStageVertexLayoutBits(
|
|
const GrPaint& paint,
|
|
const bool hasTexCoords[GrPaint::kTotalStages]);
|
|
|
|
};
|
|
|
|
/**
|
|
* Save/restore the view-matrix in the context.
|
|
*/
|
|
class GrAutoMatrix : GrNoncopyable {
|
|
public:
|
|
GrAutoMatrix(GrContext* ctx) : fContext(ctx) {
|
|
fMatrix = ctx->getMatrix();
|
|
}
|
|
GrAutoMatrix(GrContext* ctx, const GrMatrix& matrix) : fContext(ctx) {
|
|
fMatrix = ctx->getMatrix();
|
|
ctx->setMatrix(matrix);
|
|
}
|
|
~GrAutoMatrix() {
|
|
fContext->setMatrix(fMatrix);
|
|
}
|
|
|
|
private:
|
|
GrContext* fContext;
|
|
GrMatrix fMatrix;
|
|
};
|
|
|
|
#endif
|
|
|
|
#include "GrContext_impl.h"
|
|
|