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      1 /*
      2  * Copyright 2015 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 #ifndef GrGLSLProgramDataManager_DEFINED
      9 #define GrGLSLProgramDataManager_DEFINED
     10 
     11 #include "SkTypes.h"
     12 
     13 class SkMatrix;
     14 
     15 /** Manages the resources used by a shader program.
     16  * The resources are objects the program uses to communicate with the
     17  * application code.
     18  */
     19 class GrGLSLProgramDataManager : SkNoncopyable {
     20 public:
     21     // Opaque handle to a resource
     22     class ShaderResourceHandle {
     23     public:
     24         ShaderResourceHandle(int value)
     25             : fValue(value) {
     26             SkASSERT(this->isValid());
     27         }
     28 
     29         ShaderResourceHandle()
     30             : fValue(kInvalid_ShaderResourceHandle) {
     31         }
     32 
     33         bool operator==(const ShaderResourceHandle& other) const { return other.fValue == fValue; }
     34         bool isValid() const { return kInvalid_ShaderResourceHandle != fValue; }
     35         int toIndex() const { SkASSERT(this->isValid()); return fValue; }
     36 
     37     private:
     38         static const int kInvalid_ShaderResourceHandle = -1;
     39         int fValue;
     40     };
     41 
     42     typedef ShaderResourceHandle UniformHandle;
     43 
     44     virtual ~GrGLSLProgramDataManager() {}
     45 
     46     /** Functions for uploading uniform values. The varities ending in v can be used to upload to an
     47      *  array of uniforms. arrayCount must be <= the array count of the uniform.
     48      */
     49     virtual void set1f(UniformHandle, float v0) const = 0;
     50     virtual void set1fv(UniformHandle, int arrayCount, const float v[]) const = 0;
     51     virtual void set2f(UniformHandle, float, float) const = 0;
     52     virtual void set2fv(UniformHandle, int arrayCount, const float v[]) const = 0;
     53     virtual void set3f(UniformHandle, float, float, float) const = 0;
     54     virtual void set3fv(UniformHandle, int arrayCount, const float v[]) const = 0;
     55     virtual void set4f(UniformHandle, float, float, float, float) const = 0;
     56     virtual void set4fv(UniformHandle, int arrayCount, const float v[]) const = 0;
     57     // matrices are column-major, the first three upload a single matrix, the latter three upload
     58     // arrayCount matrices into a uniform array.
     59     virtual void setMatrix3f(UniformHandle, const float matrix[]) const = 0;
     60     virtual void setMatrix4f(UniformHandle, const float matrix[]) const = 0;
     61     virtual void setMatrix3fv(UniformHandle, int arrayCount, const float matrices[]) const = 0;
     62     virtual void setMatrix4fv(UniformHandle, int arrayCount, const float matrices[]) const = 0;
     63 
     64     // convenience method for uploading a SkMatrix to a 3x3 matrix uniform
     65     void setSkMatrix(UniformHandle, const SkMatrix&) const;
     66 
     67     // for nvpr only
     68     typedef ShaderResourceHandle VaryingHandle;
     69     virtual void setPathFragmentInputTransform(VaryingHandle u, int components,
     70                                                const SkMatrix& matrix) const = 0;
     71 
     72 protected:
     73     GrGLSLProgramDataManager() {}
     74 
     75 private:
     76 
     77     typedef SkNoncopyable INHERITED;
     78 };
     79 
     80 #endif
     81