Shader.h

/*
 * Gamedev Framework (gf)
 * Copyright (C) 2016-2021 Julien Bernard
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgment in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 *
 * Part of this file comes from SFML, with the same license:
 * Copyright (C) 2007-2015 Laurent Gomila (laurent@sfml-dev.org)
 */
#ifndef GF_SHADER_H
#define GF_SHADER_H

#include <string>
#include <map>

#include "GraphicsApi.h"
#include "Matrix.h"
#include "Path.h"
#include "Texture.h"
#include "Vector.h"

namespace gf {
#ifndef DOXYGEN_SHOULD_SKIP_THIS
inline namespace v1 {
#endif

  class InputStream;

  class GF_GRAPHICS_API Shader {
  public:
    enum Type {
      Vertex,   
      Fragment, 
    };

    Shader();

    Shader(const Path& filename, Type type);

    Shader(const Path& vertexShaderFilename, const Path& fragmentShaderFilename);

    Shader(const char *shader, Type type);

    Shader(const char *vertexShader, const char *fragmentShader);

    Shader(InputStream& stream, Type type);

    Shader(InputStream& vertexShaderStream, InputStream& fragmentShaderStream);

    ~Shader();

    Shader(const Shader&) = delete;

    Shader& operator=(const Shader&) = delete;

    void setUniform(const std::string& name, float val);

    void setUniform(const std::string& name, int val);

    void setUniform(const std::string& name, const Vector2f& vec);

    void setUniform(const std::string& name, const Vector3f& vec);

    void setUniform(const std::string& name, const Vector4f& vec);

    void setUniform(const std::string& name, const Vector2i& vec);

    void setUniform(const std::string& name, const Vector3i& vec);

    void setUniform(const std::string& name, const Vector4i& vec);

    void setUniform(const std::string& name, const Matrix3f& mat);

    void setUniform(const std::string& name, const Matrix4f& mat);

    void setUniform(const std::string& name, const BareTexture& tex);

    static void bind(const Shader *shader);

  private:
    friend class RenderTarget;
    int getUniformLocation(const std::string& name);
    int getAttributeLocation(const std::string& name);

    struct Guard;

  private:
    unsigned m_program;

    std::map<int, const BareTexture *> m_textures;
  };

#ifndef DOXYGEN_SHOULD_SKIP_THIS
}
#endif
}

#endif // GF_SHADER_H