shader.hpp

/*
    Shader.
    Copyright (C) 2015 Denis BOURGE

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
    USA
*/

#ifndef HX3D_GRAPHICS_SHADER
#define HX3D_GRAPHICS_SHADER

#include "hx3d/graphics/gl.hpp"

#include "hx3d/utils/ptr.hpp"
#include "hx3d/utils/resource.hpp"

#include <glm/glm.hpp>

#include <string>
#include <map>

namespace hx3d {
namespace graphics {

class Shader: public Resource {

public:
  explicit Shader(std::string pathToShader);

  Shader(std::string vert, std::string frag);
  ~Shader();

  GLuint getProgramID() const;

  void setUniform1f(std::string uniform, float value);
  void setUniform2f(std::string uniform, glm::vec2 vector);
  void setUniform3f(std::string uniform, glm::vec3 vector);
  void setUniform4f(std::string uniform, glm::vec4 vector);
  void setUniformMatrix3f(std::string uniform, glm::mat3 matrix);
  void setUniformMatrix4f(std::string uniform, glm::mat4 matrix);

  GLint getAttribute(std::string name);
  GLint getUniform(std::string name);


  static void use(Ptr<Shader> shader);

  static void disable();

  static void setProgramAnalyzing(bool value);

protected:
  Shader(const Shader& shader) = delete;
  Shader& operator=(const Shader& shader) = delete;

  bool compile(const std::string& vert, const std::string& frag);

  bool compile(GLuint &shaderId, GLenum type, const std::string& content);

  bool createProgram();

  void analyzeAttributes();
  void analyzeUniforms();
  std::string getParameterType(GLenum type);

  GLuint _vertexID;
  GLuint _fragmentID;
  GLuint _programID;

  std::map<std::string, GLint> _activeAttributes;
  std::map<std::string, GLint> _activeUniforms;
  static bool _programsAnalyzed;
};

} /* graphics */
} /* hx3d */

#endif