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      1 
      2 /*
      3  * Copyright 2013 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #ifndef GrDrawTargetCaps_DEFINED
      9 #define GrDrawTargetCaps_DEFINED
     10 
     11 #include "GrTypes.h"
     12 #include "SkRefCnt.h"
     13 #include "SkString.h"
     14 
     15 /**
     16  * Represents the draw target capabilities.
     17  */
     18 class GrDrawTargetCaps : public SkRefCnt {
     19 public:
     20     SK_DECLARE_INST_COUNT(GrDrawTargetCaps)
     21 
     22     GrDrawTargetCaps() : fUniqueID(CreateUniqueID()) {
     23         this->reset();
     24     }
     25     GrDrawTargetCaps(const GrDrawTargetCaps& other) : INHERITED(), fUniqueID(CreateUniqueID()) {
     26         *this = other;
     27     }
     28     GrDrawTargetCaps& operator= (const GrDrawTargetCaps&);
     29 
     30     virtual void reset();
     31     virtual SkString dump() const;
     32 
     33     bool npotTextureTileSupport() const { return fNPOTTextureTileSupport; }
     34     /** To avoid as-yet-unnecessary complexity we don't allow any partial support of MIP Maps (e.g.
     35         only for POT textures) */
     36     bool mipMapSupport() const { return fMipMapSupport; }
     37     bool twoSidedStencilSupport() const { return fTwoSidedStencilSupport; }
     38     bool stencilWrapOpsSupport() const { return  fStencilWrapOpsSupport; }
     39     bool hwAALineSupport() const { return fHWAALineSupport; }
     40     bool shaderDerivativeSupport() const { return fShaderDerivativeSupport; }
     41     bool geometryShaderSupport() const { return fGeometryShaderSupport; }
     42     bool dualSourceBlendingSupport() const { return fDualSourceBlendingSupport; }
     43     bool pathRenderingSupport() const { return fPathRenderingSupport; }
     44     bool dstReadInShaderSupport() const { return fDstReadInShaderSupport; }
     45     bool discardRenderTargetSupport() const { return fDiscardRenderTargetSupport; }
     46     bool gpuTracingSupport() const { return fGpuTracingSupport; }
     47     bool compressedTexSubImageSupport() const { return fCompressedTexSubImageSupport; }
     48 
     49     /**
     50      * Indicates whether GPU->CPU memory mapping for GPU resources such as vertex buffers and
     51      * textures allows partial mappings or full mappings.
     52      */
     53     enum MapFlags {
     54         kNone_MapFlags   = 0x0,       //<! Cannot map the resource.
     55 
     56         kCanMap_MapFlag  = 0x1,       //<! The resource can be mapped. Must be set for any of
     57                                       //   the other flags to have meaning.k
     58         kSubset_MapFlag  = 0x2,       //<! The resource can be partially mapped.
     59     };
     60 
     61     uint32_t mapBufferFlags() const { return fMapBufferFlags; }
     62 
     63     // Scratch textures not being reused means that those scratch textures
     64     // that we upload to (i.e., don't have a render target) will not be
     65     // recycled in the texture cache. This is to prevent ghosting by drivers
     66     // (in particular for deferred architectures).
     67     bool reuseScratchTextures() const { return fReuseScratchTextures; }
     68 
     69     int maxRenderTargetSize() const { return fMaxRenderTargetSize; }
     70     int maxTextureSize() const { return fMaxTextureSize; }
     71     // Will be 0 if MSAA is not supported
     72     int maxSampleCount() const { return fMaxSampleCount; }
     73 
     74     bool isConfigRenderable(GrPixelConfig config, bool withMSAA) const {
     75         SkASSERT(kGrPixelConfigCnt > config);
     76         return fConfigRenderSupport[config][withMSAA];
     77     }
     78 
     79     bool isConfigTexturable(GrPixelConfig config) const {
     80         SkASSERT(kGrPixelConfigCnt > config);
     81         return fConfigTextureSupport[config];
     82     }
     83 
     84     /**
     85      * Gets an id that is unique for this GrDrawTargetCaps object. It is static in that it does
     86      * not change when the content of the GrDrawTargetCaps object changes. This will never return
     87      * 0.
     88      */
     89     uint32_t getUniqueID() const { return fUniqueID; }
     90 
     91 protected:
     92     bool fNPOTTextureTileSupport    : 1;
     93     bool fMipMapSupport             : 1;
     94     bool fTwoSidedStencilSupport    : 1;
     95     bool fStencilWrapOpsSupport     : 1;
     96     bool fHWAALineSupport           : 1;
     97     bool fShaderDerivativeSupport   : 1;
     98     bool fGeometryShaderSupport     : 1;
     99     bool fDualSourceBlendingSupport : 1;
    100     bool fPathRenderingSupport      : 1;
    101     bool fDstReadInShaderSupport    : 1;
    102     bool fDiscardRenderTargetSupport: 1;
    103     bool fReuseScratchTextures      : 1;
    104     bool fGpuTracingSupport         : 1;
    105     bool fCompressedTexSubImageSupport : 1;
    106 
    107     uint32_t fMapBufferFlags;
    108 
    109     int fMaxRenderTargetSize;
    110     int fMaxTextureSize;
    111     int fMaxSampleCount;
    112 
    113     // The first entry for each config is without msaa and the second is with.
    114     bool fConfigRenderSupport[kGrPixelConfigCnt][2];
    115     bool fConfigTextureSupport[kGrPixelConfigCnt];
    116 
    117 private:
    118     static uint32_t CreateUniqueID();
    119 
    120     const uint32_t          fUniqueID;
    121 
    122     typedef SkRefCnt INHERITED;
    123 };
    124 
    125 #endif
    126