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 */
18class GrDrawTargetCaps : public SkRefCnt {
19public:
20    SK_DECLARE_INST_COUNT(Caps)
21
22    GrDrawTargetCaps() { this->reset(); }
23    GrDrawTargetCaps(const GrDrawTargetCaps& other) : INHERITED() { *this = other; }
24    GrDrawTargetCaps& operator= (const GrDrawTargetCaps&);
25
26    virtual void reset();
27    virtual SkString dump() const;
28
29    bool npotTextureTileSupport() const { return fNPOTTextureTileSupport; }
30    /** To avoid as-yet-unnecessary complexity we don't allow any partial support of MIP Maps (e.g.
31        only for POT textures) */
32    bool mipMapSupport() const { return fMipMapSupport; }
33    bool twoSidedStencilSupport() const { return fTwoSidedStencilSupport; }
34    bool stencilWrapOpsSupport() const { return  fStencilWrapOpsSupport; }
35    bool hwAALineSupport() const { return fHWAALineSupport; }
36    bool shaderDerivativeSupport() const { return fShaderDerivativeSupport; }
37    bool geometryShaderSupport() const { return fGeometryShaderSupport; }
38    bool dualSourceBlendingSupport() const { return fDualSourceBlendingSupport; }
39    bool pathRenderingSupport() const { return fPathRenderingSupport; }
40    bool dstReadInShaderSupport() const { return fDstReadInShaderSupport; }
41    bool discardRenderTargetSupport() const { return fDiscardRenderTargetSupport; }
42    bool gpuTracingSupport() const { return fGpuTracingSupport; }
43
44    /**
45     * Indicates whether GPU->CPU memory mapping for GPU resources such as vertex buffers and
46     * textures allows partial mappings or full mappings.
47     */
48    enum MapFlags {
49        kNone_MapFlags   = 0x0,       //<! Cannot map the resource.
50
51        kCanMap_MapFlag  = 0x1,       //<! The resource can be mapped. Must be set for any of
52                                      //   the other flags to have meaning.k
53        kSubset_MapFlag  = 0x2,       //<! The resource can be partially mapped.
54    };
55
56    uint32_t mapBufferFlags() const { return fMapBufferFlags; }
57
58    // Scratch textures not being reused means that those scratch textures
59    // that we upload to (i.e., don't have a render target) will not be
60    // recycled in the texture cache. This is to prevent ghosting by drivers
61    // (in particular for deferred architectures).
62    bool reuseScratchTextures() const { return fReuseScratchTextures; }
63
64    int maxRenderTargetSize() const { return fMaxRenderTargetSize; }
65    int maxTextureSize() const { return fMaxTextureSize; }
66    // Will be 0 if MSAA is not supported
67    int maxSampleCount() const { return fMaxSampleCount; }
68
69    bool isConfigRenderable(GrPixelConfig config, bool withMSAA) const {
70        SkASSERT(kGrPixelConfigCnt > config);
71        return fConfigRenderSupport[config][withMSAA];
72    }
73
74    bool isConfigTexturable(GrPixelConfig config) const {
75        SkASSERT(kGrPixelConfigCnt > config);
76        return fConfigTextureSupport[config];
77    }
78
79protected:
80    bool fNPOTTextureTileSupport    : 1;
81    bool fMipMapSupport             : 1;
82    bool fTwoSidedStencilSupport    : 1;
83    bool fStencilWrapOpsSupport     : 1;
84    bool fHWAALineSupport           : 1;
85    bool fShaderDerivativeSupport   : 1;
86    bool fGeometryShaderSupport     : 1;
87    bool fDualSourceBlendingSupport : 1;
88    bool fPathRenderingSupport      : 1;
89    bool fDstReadInShaderSupport    : 1;
90    bool fDiscardRenderTargetSupport: 1;
91    bool fReuseScratchTextures      : 1;
92    bool fGpuTracingSupport         : 1;
93
94    uint32_t fMapBufferFlags;
95
96    int fMaxRenderTargetSize;
97    int fMaxTextureSize;
98    int fMaxSampleCount;
99
100    // The first entry for each config is without msaa and the second is with.
101    bool fConfigRenderSupport[kGrPixelConfigCnt][2];
102    bool fConfigTextureSupport[kGrPixelConfigCnt];
103
104    typedef SkRefCnt INHERITED;
105};
106
107#endif
108