Create GLSLUniformHandler class for gpu backend

src/gpu/glsl/GrGLSLProgramBuilder.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLSLProgramBuilder_DEFINED
 #define GrGLSLProgramBuilder_DEFINED
 
 #include "GrGeometryProcessor.h"
 #include "GrGpu.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
 #include "glsl/GrGLSLGeometryShaderBuilder.h"
 #include "glsl/GrGLSLProgramDataManager.h"
+#include "glsl/GrGLSLUniformHandler.h"
 #include "glsl/GrGLSLVertexShaderBuilder.h"
 
 class GrGLSLCaps;
 class GrGLSLShaderVar;
 class GrGLSLVaryingHandler;
 
-// Enough precision to represent 1 / 2048 accurately in printf
-#define GR_SIGNIFICANT_POW2_DECIMAL_DIG 11
-
-class GrGLSLUniformBuilder {
-public:
-    enum ShaderVisibility {
-        kVertex_Visibility   = 1 << kVertex_GrShaderType,
-        kGeometry_Visibility = 1 << kGeometry_GrShaderType,
-        kFragment_Visibility = 1 << kFragment_GrShaderType,
-    };
-
-    virtual ~GrGLSLUniformBuilder() {}
-
-    typedef GrGLSLProgramDataManager::UniformHandle UniformHandle;
-
-    /** Add a uniform variable to the current program, that has visibility in one or more shaders.
-        visibility is a bitfield of ShaderVisibility values indicating from which shaders the
-        uniform should be accessible. At least one bit must be set. Geometry shader uniforms are not
-        supported at this time. The actual uniform name will be mangled. If outName is not nullptr
-        then it will refer to the final uniform name after return. Use the addUniformArray variant
-        to add an array of uniforms. */
-    UniformHandle addUniform(uint32_t visibility,
-                             GrSLType type,
-                             GrSLPrecision precision,
-                             const char* name,
-                             const char** outName = nullptr) {
-        return this->addUniformArray(visibility, type, precision, name, 0, outName);
-    }
-
-    UniformHandle addUniformArray(uint32_t visibility,
-                                  GrSLType type,
-                                  GrSLPrecision precision,
-                                  const char* name,
-                                  int arrayCount,
-                                  const char** outName = nullptr) {
-        return this->internalAddUniformArray(visibility, type, precision, name, true, arrayCount,
-                                             outName);
-    }
-
-    virtual const GrGLSLShaderVar& getUniformVariable(UniformHandle u) const = 0;
-
-    /**
-     * Shortcut for getUniformVariable(u).c_str()
-     */
-    virtual const char* getUniformCStr(UniformHandle u) const = 0;
-
-    /*
-     * *NOTE* NO MEMBERS ALLOWED, MULTIPLE INHERITANCE
-     */
-protected:
-    virtual UniformHandle internalAddUniformArray(
-        uint32_t visibility,
-        GrSLType type,
-        GrSLPrecision precision,
-        const char* name,
-        bool mangleName,
-        int arrayCount,
-        const char** outName) = 0;
-};
-
-/* a specialization of the above for GPs.  Lets the user add uniforms, varyings, and VS / FS code */
-class GrGLSLGPBuilder : public virtual GrGLSLUniformBuilder {
-public:
-    /*
-     * *NOTE* NO MEMBERS ALLOWED, MULTIPLE INHERITANCE
-     */
-};
-
-
-/* a specializations for FPs. Lets the user add uniforms and FS code */
-class GrGLSLFPBuilder : public virtual GrGLSLUniformBuilder {
-public:
-    /*
-     * *NOTE* NO MEMBERS ALLOWED, MULTIPLE INHERITANCE
-     */
-};
-
-/* a specializations for XPs. Lets the user add uniforms and FS code */
-class GrGLSLXPBuilder : public virtual GrGLSLUniformBuilder {
-public:
-    /*
-     * *NOTE* NO MEMBERS ALLOWED, MULTIPLE INHERITANCE
-     */
-};
-
-class GrGLSLProgramBuilder : public GrGLSLGPBuilder,
-                             public GrGLSLFPBuilder,
-                             public GrGLSLXPBuilder {
+class GrGLSLProgramBuilder {
 public:
     typedef GrGpu::DrawArgs DrawArgs;
+    typedef GrGLSLUniformHandler::ShaderVisibility ShaderVisibility;
+    typedef GrGLSLUniformHandler::UniformHandle UniformHandle;
+
+    virtual ~GrGLSLProgramBuilder() {}
 
     virtual const GrGLSLCaps* glslCaps() const = 0;
 
+    const GrPrimitiveProcessor& primitiveProcessor() const { return *fArgs.fPrimitiveProcessor; }
+    const GrPipeline& pipeline() const { return *fArgs.fPipeline; }
+    const GrProgramDesc& desc() const { return *fArgs.fDesc; }
+    const GrProgramDesc::KeyHeader& header() const { return fArgs.fDesc->header(); }
+
+    void appendUniformDecls(ShaderVisibility, SkString*) const;
+
     // Handles for program uniforms (other than per-effect uniforms)
     struct BuiltinUniformHandles {
         UniformHandle       fRTAdjustmentUni;
 
         // We use the render target height to provide a y-down frag coord when specifying
         // origin_upper_left is not supported.
         UniformHandle       fRTHeightUni;
     };
 
-protected:
-    explicit GrGLSLProgramBuilder(const DrawArgs& args);
-
-    const GrPrimitiveProcessor& primitiveProcessor() const { return *fArgs.fPrimitiveProcessor; }
-    const GrPipeline& pipeline() const { return *fArgs.fPipeline; }
-    const GrProgramDesc& desc() const { return *fArgs.fDesc; }
-    const GrProgramDesc::KeyHeader& header() const { return fArgs.fDesc->header(); }
-
-    void appendUniformDecls(ShaderVisibility, SkString*) const;
-
-    // Used to add a uniform for frag position without mangling the name of the uniform inside of a
-    // stage.
-    UniformHandle addFragPosUniform(uint32_t visibility,
-                                    GrSLType type,
-                                    GrSLPrecision precision,
-                                    const char* name,
-                                    const char** outName) {
-        return this->internalAddUniformArray(visibility, type, precision, name, false, 0, outName);
-    }
-
+    // Used to add a uniform in the vertex shader for transforming into normalized device space.
+    void addRTAdjustmentUniform(GrSLPrecision precision, const char* name, const char** outName);
     const char* rtAdjustment() const { return "rtAdjustment"; }
+ 
+    // Used to add a uniform for the RenderTarget height (used for frag position) without mangling
+    // the name of the uniform inside of a stage.
+    void addRTHeightUniform(const char* name, const char** outName);
 
     // Generates a name for a variable. The generated string will be name prefixed by the prefix
     // char (unless the prefix is '\0'). It also will mangle the name to be stage-specific unless
     // explicitly asked not to.
     void nameVariable(SkString* out, char prefix, const char* name, bool mangle = true);
 
+    virtual GrGLSLUniformHandler* uniformHandler() = 0;
+    virtual const GrGLSLUniformHandler* uniformHandler() const = 0;
     virtual GrGLSLVaryingHandler* varyingHandler() = 0;
 
     // number of each input/output type in a single allocation block, used by many builders
     static const int kVarsPerBlock;
 
     GrGLSLVertexBuilder         fVS;
     GrGLSLGeometryBuilder       fGS;
     GrGLSLFragmentShaderBuilder fFS;
 
     int fStageIndex;
 
+    const DrawArgs& fArgs;
+
     BuiltinUniformHandles fUniformHandles;
 
-    const DrawArgs& fArgs;
-
-private:
-    virtual void onAppendUniformDecls(ShaderVisibility visibility, SkString* out) const = 0;
-
-    friend class GrGLSLShaderBuilder;
-    friend class GrGLSLVertexBuilder;
-    friend class GrGLSLFragmentShaderBuilder;
-    friend class GrGLSLGeometryBuilder;
-    friend class GrGLSLVaryingHandler;
+protected:
+    explicit GrGLSLProgramBuilder(const DrawArgs& args);
 };
 
 #endif