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      1 /*
      2  * Copyright 2011 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 
      9 #ifndef GrGLRenderTarget_DEFINED
     10 #define GrGLRenderTarget_DEFINED
     11 
     12 #include "GrBackendSurface.h"
     13 #include "GrGLIRect.h"
     14 #include "GrRenderTarget.h"
     15 #include "SkScalar.h"
     16 
     17 class GrGLCaps;
     18 class GrGLGpu;
     19 class GrGLStencilAttachment;
     20 
     21 class GrGLRenderTarget : public GrRenderTarget {
     22 public:
     23     bool alwaysClearStencil() const override { return 0 == fRTFBOID; }
     24 
     25     // set fTexFBOID to this value to indicate that it is multisampled but
     26     // Gr doesn't know how to resolve it.
     27     enum { kUnresolvableFBOID = 0 };
     28 
     29     struct IDDesc {
     30         GrGLuint                   fRTFBOID;
     31         GrBackendObjectOwnership   fRTFBOOwnership;
     32         GrGLuint                   fTexFBOID;
     33         GrGLuint                   fMSColorRenderbufferID;
     34         bool                       fIsMixedSampled;
     35     };
     36 
     37     static sk_sp<GrGLRenderTarget> MakeWrapped(GrGLGpu*,
     38                                                const GrSurfaceDesc&,
     39                                                GrGLenum format,
     40                                                const IDDesc&,
     41                                                int stencilBits);
     42 
     43     void setViewport(const GrGLIRect& rect) { fViewport = rect; }
     44     const GrGLIRect& getViewport() const { return fViewport; }
     45 
     46     // The following two functions return the same ID when a texture/render target is not
     47     // multisampled, and different IDs when it is multisampled.
     48     // FBO ID used to render into
     49     GrGLuint renderFBOID() const { return fRTFBOID; }
     50     // FBO ID that has texture ID attached.
     51     GrGLuint textureFBOID() const { return fTexFBOID; }
     52 
     53     // override of GrRenderTarget
     54     ResolveType getResolveType() const override {
     55         if (GrFSAAType::kUnifiedMSAA != this->fsaaType() || fRTFBOID == fTexFBOID) {
     56             // catches FBO 0 and non unified-MSAA case
     57             return kAutoResolves_ResolveType;
     58         } else if (kUnresolvableFBOID == fTexFBOID) {
     59             return kCantResolve_ResolveType;
     60         } else {
     61             return kCanResolve_ResolveType;
     62         }
     63     }
     64 
     65     GrBackendRenderTarget getBackendRenderTarget() const override;
     66 
     67     GrBackendFormat backendFormat() const override;
     68 
     69     bool canAttemptStencilAttachment() const override;
     70 
     71     // GrGLRenderTarget overrides dumpMemoryStatistics so it can log its texture and renderbuffer
     72     // components seperately.
     73     void dumpMemoryStatistics(SkTraceMemoryDump* traceMemoryDump) const override;
     74 
     75 protected:
     76     // Constructor for subclasses.
     77     GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, GrGLenum format, const IDDesc&);
     78 
     79     void init(const GrSurfaceDesc&, GrGLenum format, const IDDesc&);
     80 
     81     void onAbandon() override;
     82     void onRelease() override;
     83 
     84     int numSamplesOwnedPerPixel() const { return fNumSamplesOwnedPerPixel; }
     85 
     86 private:
     87     // Constructor for instances wrapping backend objects.
     88     GrGLRenderTarget(GrGLGpu*, const GrSurfaceDesc&, GrGLenum format, const IDDesc&,
     89                      GrGLStencilAttachment*);
     90 
     91     void setFlags(const GrGLCaps&, const IDDesc&);
     92 
     93     GrGLGpu* getGLGpu() const;
     94     bool completeStencilAttachment() override;
     95 
     96     size_t onGpuMemorySize() const override;
     97 
     98     int msaaSamples() const;
     99     // The number total number of samples, including both MSAA and resolve texture samples.
    100     int totalSamples() const;
    101 
    102     GrGLuint    fRTFBOID;
    103     GrGLuint    fTexFBOID;
    104     GrGLuint    fMSColorRenderbufferID;
    105     GrGLenum    fRTFormat;
    106 
    107     GrBackendObjectOwnership fRTFBOOwnership;
    108 
    109     // when we switch to this render target we want to set the viewport to
    110     // only render to content area (as opposed to the whole allocation) and
    111     // we want the rendering to be at top left (GL has origin in bottom left)
    112     GrGLIRect   fViewport;
    113 
    114     // The RenderTarget needs to be able to report its VRAM footprint even after abandon and
    115     // release have potentially zeroed out the IDs (e.g., so the cache can reset itself). Since
    116     // the IDs are just required for the computation in totalSamples we cache that result here.
    117     int         fNumSamplesOwnedPerPixel;
    118 
    119     typedef GrRenderTarget INHERITED;
    120 };
    121 
    122 #endif
    123