cs237-shader.hxx

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/*
 * COPYRIGHT (c) 2013 John Reppy (http://cs.uchicago.edu/~jhr)
 * All rights reserved.
 */

#ifndef _CS237_SHADER_HXX_
#define _CS237_SHADER_HXX_

#ifndef _CS237_HXX_
#error "cs237-shader.hxx should not be included directly"
#endif

namespace cs237 {

    namespace __detail {

    class Shader {
      public:
        GLuint Id() const { return this->_obj->_id; }

      protected:
        Shader (GLenum kind);

        bool LoadFromFile (const char *file);
        bool LoadFromString (const char **prog);

      private:
        // wrapper class around GL Shader ID
        struct Obj {
        GLuint  _id;
        Obj (GLuint id) : _id(id) { }
        ~Obj();
        };

        std::shared_ptr<Obj> _obj;
        GLenum _kind;
    };

    } // namespace __detail

    class VertexShader : public __detail::Shader {
      public:

    VertexShader (const char *file);

    VertexShader (const char **prog);

    }; /* VertexShader */

    class GeometryShader : public __detail::Shader {
      public:

    GeometryShader (const char *file);

    GeometryShader (const char **prog);

    }; /* GeometryShader */

    class FragmentShader : public __detail::Shader {
      public:

    FragmentShader (const char *file);

    FragmentShader (const char **prog);

    }; /* FragmentShader */

    class ShaderProgram {
      public:

    ShaderProgram (VertexShader const &vsh, FragmentShader const &fsh);
    ShaderProgram (VertexShader const &vsh, GeometryShader const &gsh, FragmentShader const &fsh);

    void Use ();

    bool hasAttribute (const char *name);

    int AttributeLocation (const char *name);

    bool hasUniform (const char *name);

    int UniformLocation (const char *name);

    GLuint Id () { return this->_obj->_id; }

      private:

      // wrapper class around GL Shader Program ID
    struct Obj {
        GLuint  _id;
        Obj (GLuint id) : _id(id) { }
        ~Obj();
    };

    std::shared_ptr<Obj> _obj;

    void _Link ();

    }; // ShaderProgram

} /* namespace cs237 */

#endif /* !_CS237_SHADER_HXX_ */