/*
 * 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 GrGLSLProgramDataManager_DEFINED
#define GrGLSLProgramDataManager_DEFINED

#include "GrResourceHandle.h"
#include "SkNoncopyable.h"
#include "SkTypes.h"

class SkMatrix;
class SkMatrix44;

/** Manages the resources used by a shader program.
 * The resources are objects the program uses to communicate with the
 * application code.
 */
class GrGLSLProgramDataManager : SkNoncopyable {
public:
    GR_DEFINE_RESOURCE_HANDLE_CLASS(UniformHandle);

    virtual ~GrGLSLProgramDataManager() {}

    /** Functions for uploading uniform values. The varities ending in v can be used to upload to an
     *  array of uniforms. arrayCount must be <= the array count of the uniform.
     */
    virtual void set1i(UniformHandle, int32_t) const = 0;
    virtual void set1iv(UniformHandle, int arrayCount, const int v[]) const = 0;
    virtual void set1f(UniformHandle, float v0) const = 0;
    virtual void set1fv(UniformHandle, int arrayCount, const float v[]) const = 0;
    virtual void set2f(UniformHandle, float, float) const = 0;
    virtual void set2fv(UniformHandle, int arrayCount, const float v[]) const = 0;
    virtual void set3f(UniformHandle, float, float, float) const = 0;
    virtual void set3fv(UniformHandle, int arrayCount, const float v[]) const = 0;
    virtual void set4f(UniformHandle, float, float, float, float) const = 0;
    virtual void set4fv(UniformHandle, int arrayCount, const float v[]) const = 0;
    // matrices are column-major, the first three upload a single matrix, the latter three upload
    // arrayCount matrices into a uniform array.
    virtual void setMatrix2f(UniformHandle, const float matrix[]) const = 0;
    virtual void setMatrix3f(UniformHandle, const float matrix[]) const = 0;
    virtual void setMatrix4f(UniformHandle, const float matrix[]) const = 0;
    virtual void setMatrix2fv(UniformHandle, int arrayCount, const float matrices[]) const = 0;
    virtual void setMatrix3fv(UniformHandle, int arrayCount, const float matrices[]) const = 0;
    virtual void setMatrix4fv(UniformHandle, int arrayCount, const float matrices[]) const = 0;

    // convenience method for uploading a SkMatrix to a 3x3 matrix uniform
    void setSkMatrix(UniformHandle, const SkMatrix&) const;

    // convenience method for uploading a SkMatrix44 to a 4x4 matrix uniform
    void setSkMatrix44(UniformHandle, const SkMatrix44&) const;

    // for nvpr only
    GR_DEFINE_RESOURCE_HANDLE_CLASS(VaryingHandle);
    virtual void setPathFragmentInputTransform(VaryingHandle u, int components,
                                               const SkMatrix& matrix) const = 0;

protected:
    GrGLSLProgramDataManager() {}

private:
    typedef SkNoncopyable INHERITED;
};

#endif