Pull out shader-specific caps into GrShaderCaps and GrGLSLCaps

src/gpu/gl/GrGLCaps.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLCaps_DEFINED
 #define GrGLCaps_DEFINED
 
 #include "GrDrawTargetCaps.h"
 #include "GrGLStencilAttachment.h"
 #include "SkChecksum.h"
 #include "SkTHash.h"
 #include "SkTArray.h"
 
 class GrGLContextInfo;
+class GrGLSLCaps;
 
 /**
  * Stores some capabilities of a GL context. Most are determined by the GL
  * version and the extensions string. It also tracks formats that have passed
  * the FBO completeness test.
  */
 class GrGLCaps : public GrDrawTargetCaps {
 public:
     SK_DECLARE_INST_COUNT(GrGLCaps)
 
@@ skipping 129 matching lines @@
 
     /**
      * Is the MSAA FBO extension one where the texture is multisampled when bound to an FBO and
      * then implicitly resolved when read.
      */
     bool usesImplicitMSAAResolve() const {
         return kES_IMG_MsToTexture_MSFBOType == fMSFBOType ||
                kES_EXT_MsToTexture_MSFBOType == fMSFBOType;
     }
 
-    /**
-     * Some helper functions for encapsulating various extensions to read FB Buffer on openglES
-     *
-     * TODO(joshualitt) On desktop opengl 4.2+ we can achieve something similar to this effect
-     */
-    bool fbFetchSupport() const { return fFBFetchSupport; }
-
-    bool fbFetchNeedsCustomOutput() const { return fFBFetchNeedsCustomOutput; }
-
-    const char* fbFetchColorName() const { return fFBFetchColorName; }
-
-    const char* fbFetchExtensionString() const { return fFBFetchExtensionString; }
-
     bool fbMixedSamplesSupport() const { return fFBMixedSamplesSupport; }
 
     InvalidateFBType invalidateFBType() const { return fInvalidateFBType; }
 
     /// What type of buffer mapping is supported?
     MapBufferType mapBufferType() const { return fMapBufferType; }
 
     /**
      * Gets an array of legal stencil formats. These formats are not guaranteed
      * to be supported by the driver but are legal GLenum names given the GL
@@ skipping 67 matching lines @@
     bool readPixelsSupported(const GrGLInterface* intf,
                              GrGLenum format,
                              GrGLenum type,
                              GrGLenum currFboFormat) const;
 
     bool isCoreProfile() const { return fIsCoreProfile; }
 
 
     bool fullClearIsFree() const { return fFullClearIsFree; }
 
-    bool dropsTileOnZeroDivide() const { return fDropsTileOnZeroDivide; }
-
     /**
      * Returns a string containing the caps info.
      */
     SkString dump() const override;
 
     /**
      * LATC can appear under one of three possible names. In order to know
      * which GL internal format to use, we need to keep track of which name
      * we found LATC under. The default is LATC.
      */
     enum LATCAlias {
         kLATC_LATCAlias,
         kRGTC_LATCAlias,
         k3DC_LATCAlias
     };
 
     LATCAlias latcAlias() const { return fLATCAlias; }
 
+    GrGLSLCaps* glslCaps() const { return reinterpret_cast<GrGLSLCaps*>(fShaderCaps.get()); }
+
 private:
     /**
      * Maintains a bit per GrPixelConfig. It is used to avoid redundantly
      * performing glCheckFrameBufferStatus for the same config.
      */
     struct VerifiedColorConfigs {
         VerifiedColorConfigs() {
             this->reset();
         }
 
@@ skipping 24 matching lines @@
             return SkToBool(fVerifiedColorConfigs[u32Idx] & (1 << bitIdx));
         }
     };
 
     void initFSAASupport(const GrGLContextInfo&, const GrGLInterface*);
     void initStencilFormats(const GrGLContextInfo&);
     // This must be called after initFSAASupport().
     void initConfigRenderableTable(const GrGLContextInfo&);
     void initConfigTexturableTable(const GrGLContextInfo&, const GrGLInterface*);
 
-    // Must be called after fGeometryShaderSupport is initialized.
-    void initShaderPrecisionTable(const GrGLContextInfo&, const GrGLInterface*);
-
     bool doReadPixelsSupported(const GrGLInterface* intf, GrGLenum format, GrGLenum type) const;
 
     // tracks configs that have been verified to pass the FBO completeness when
     // used as a color attachment
     VerifiedColorConfigs fVerifiedColorConfigs;
 
     SkTArray<StencilFormat, true> fStencilFormats;
     // tracks configs that have been verified to pass the FBO completeness when
     // used as a color attachment when a particular stencil format is used
     // as a stencil attachment.
@@ skipping 19 matching lines @@
     bool fTexStorageSupport : 1;
     bool fTextureRedSupport : 1;
     bool fImagingSupport  : 1;
     bool fTwoFormatLimit : 1;
     bool fFragCoordsConventionSupport : 1;
     bool fVertexArrayObjectSupport : 1;
     bool fES2CompatibilitySupport : 1;
     bool fUseNonVBOVertexAndIndexDynamicData : 1;
     bool fIsCoreProfile : 1;
     bool fFullClearIsFree : 1;
-    bool fDropsTileOnZeroDivide : 1;
-    bool fFBFetchSupport : 1;
-    bool fFBFetchNeedsCustomOutput : 1;
     bool fFBMixedSamplesSupport : 1;
 
-    const char* fFBFetchColorName;
-    const char* fFBFetchExtensionString;
-
     struct ReadPixelsSupportedFormat {
         GrGLenum fFormat;
         GrGLenum fType;
         GrGLenum fFboFormat;
 
         bool operator==(const ReadPixelsSupportedFormat& rhs) const {
             return fFormat    == rhs.fFormat
                 && fType      == rhs.fType
                 && fFboFormat == rhs.fFboFormat;
         }
     };
     mutable SkTHashMap<ReadPixelsSupportedFormat, bool> fReadPixelsSupportedCache;
 
     typedef GrDrawTargetCaps INHERITED;
 };
 
-typedef GrGLCaps GrGLSLCaps;
+
+class GrGLSLCaps : public GrShaderCaps {
+public:
+    SK_DECLARE_INST_COUNT(GrGLSLCaps)
+
+    /**
+     * Creates a GrGLSLCaps that advertises no support for any extensions,
+     * formats, etc. Call init to initialize from a GrGLContextInfo.
+     */
+    GrGLSLCaps();
+    ~GrGLSLCaps() override {}
+
+    GrGLSLCaps(const GrGLSLCaps& caps);
+
+    GrGLSLCaps& operator = (const GrGLSLCaps& caps);
+
+    /**
+     * Resets the caps such that nothing is supported.
+     */
+    void reset() override;
+
+    /**
+     * Initializes the GrGLSLCaps to the set of features supported in the current
+     * OpenGL context accessible via ctxInfo.
+     */
+    bool init(const GrGLContextInfo& ctxInfo, const GrGLInterface* glInterface);
+
+    /**
+     * Some helper functions for encapsulating various extensions to read FB Buffer on openglES
+     *
+     * TODO(joshualitt) On desktop opengl 4.2+ we can achieve something similar to this effect
+     */
+    bool fbFetchSupport() const { return fFBFetchSupport; }
+
+    bool fbFetchNeedsCustomOutput() const { return fFBFetchNeedsCustomOutput; }
+
+    const char* fbFetchColorName() const { return fFBFetchColorName; }
+
+    const char* fbFetchExtensionString() const { return fFBFetchExtensionString; }
+
+    bool dropsTileOnZeroDivide() const { return fDropsTileOnZeroDivide; }
+
+    /**
+    * Returns a string containing the caps info.
+    */
+    SkString dump() const override;
+
+private:
+    // Must be called after fGeometryShaderSupport is initialized.
+    void initShaderPrecisionTable(const GrGLContextInfo&, const GrGLInterface*);
+
+    bool fDropsTileOnZeroDivide : 1;
+    bool fFBFetchSupport : 1;
+    bool fFBFetchNeedsCustomOutput : 1;
+
+    const char* fFBFetchColorName;
+    const char* fFBFetchExtensionString;
+
+    typedef GrShaderCaps INHERITED;
+};
+
 
 #endif