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/** OpenGLShaders.hh file for the fluxbox compositor. */
// Copyright (c) 2011 Gediminas Liktaras (gliktaras at gmail dot com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#ifndef FBCOMPOSITOR_OPENGLSHADERS_HH
#define FBCOMPOSITOR_OPENGLSHADERS_HH
#include "FbTk/Command.hh"
#include "FbTk/RefCount.hh"
#include <GL/glew.h>
#include <GL/gl.h>
#include <vector>
namespace FbCompositor {
class BasePlugin;
//--- SHADER INITIALIZERS --------------------------------------------------
/** Rendering job initialization functor. */
typedef FbTk::Command<void> OpenGLShaderInitializer;
/**
* Null initialization action.
*/
class NullInitializer : public OpenGLShaderInitializer {
public :
virtual ~NullInitializer() { }
void execute() { }
};
//--- SHADER DEINITIALIZERS ------------------------------------------------
/** Rendering job cleanup functor. */
typedef FbTk::Command<void> OpenGLShaderDeinitializer;
/**
* Null cleanup action.
*/
class NullDeinitializer : public OpenGLShaderDeinitializer {
public :
virtual ~NullDeinitializer() { }
void execute() { }
};
//--- SHADER PROGRAM WRAPPER -----------------------------------------------
/**
* OpenGL shader program wrapper.
*/
class OpenGLShaderProgram {
public :
//--- CONSTRUCTORS AND DESTRUCTORS -------------------------------------
/** Constructor. */
OpenGLShaderProgram(const std::vector<BasePlugin*> &plugins);
/** Destructor. */
~OpenGLShaderProgram();
//--- ACCESSORS --------------------------------------------------------
/** \returns handle to the shader program. */
GLuint programHandle() const;
/** \returns location of the given attribute. */
GLuint getAttributeLocation(const char *attrib_name);
/** \returns location of the fb_InitMainTexCoord attribute. */
GLuint mainTexCoordAttrib() const;
/** \returns location of the fb_InitPrimPos attribute. */
GLuint primPosAttrib() const;
/** \returns location of the fb_InitShapeTexCoord attribute. */
GLuint shapeTexCoordAttrib() const;
/** \returns location of the given uniform. */
GLuint getUniformLocation(const char *uniform_name);
/** \returns location of the fb_Alpha uniform. */
GLuint alphaUniform() const;
/** \returns location of the fb_MainTexture uniform. */
GLuint mainTexUniform() const;
/** \returns location of the fb_ShapeTexture uniform. */
GLuint shapeTexUniform() const;
//--- SHADER MANIPULATION ----------------------------------------------
/** Uses the current shader program. */
void use();
private :
//--- INITIALIZATION FUNCTIONS -----------------------------------------
/** Creates a shader. */
GLuint createShader(GLenum shader_type, GLint source_length, const GLchar *source);
/** Creates a shader program. */
GLuint createShaderProgram(GLuint vertex_shader, GLuint fragment_shader);
//--- MAIN VARIABLES ---------------------------------------------------
/** The vertex shader. */
GLuint m_vertex_shader;
/** The fragment shader. */
GLuint m_fragment_shader;
/** The shader program. */
GLuint m_shader_program;
/** Location of the fb_InitMainTexCoord attribute. */
GLuint m_main_tex_coord_attrib;
/** Location of the fb_InitPrimPos attribute. */
GLuint m_prim_pos_attrib;
/** Location of the fb_InitShapeTexCoord attribute. */
GLuint m_shape_tex_coord_attrib;
/** Location of the fb_Alpha uniform. */
GLuint m_alpha_uniform;
/** Location of the fb_MainTexture uniform. */
GLuint m_main_tex_uniform;
/** Location of the fb_ShapeTexture uniform. */
GLuint m_shape_tex_uniform;
};
//--- INLINE FUNCTIONS -------------------------------------------------
// Returns location of the fb_Alpha uniform.
inline GLuint OpenGLShaderProgram::alphaUniform() const {
return m_alpha_uniform;
}
// Returns location of the given attribute.
inline GLuint OpenGLShaderProgram::getAttributeLocation(const char *attrib_name) {
return glGetAttribLocation(m_shader_program, attrib_name);
}
// Returns location of the given uniform.
inline GLuint OpenGLShaderProgram::getUniformLocation(const char *uniform_name) {
return glGetUniformLocation(m_shader_program, uniform_name);
}
// Returns location of the fb_InitMainTexCoord attribute.
inline GLuint OpenGLShaderProgram::mainTexCoordAttrib() const {
return m_main_tex_coord_attrib;
}
// Returns location of the fb_MainTexture uniform.
inline GLuint OpenGLShaderProgram::mainTexUniform() const {
return m_main_tex_uniform;
}
// Returns location of the fb_InitPrimPos attribute.
inline GLuint OpenGLShaderProgram::primPosAttrib() const {
return m_prim_pos_attrib;
}
// Returns the handle to the shader program.
inline GLuint OpenGLShaderProgram::programHandle() const {
return m_shader_program;
}
// Returns location of the fb_InitShapeTexCoord attribute.
inline GLuint OpenGLShaderProgram::shapeTexCoordAttrib() const {
return m_shape_tex_coord_attrib;
}
// Returns location of the fb_ShapeTexture uniform.
inline GLuint OpenGLShaderProgram::shapeTexUniform() const {
return m_shape_tex_uniform;
}
// Uses the current shader program.
inline void OpenGLShaderProgram::use() {
glUseProgram(m_shader_program);
}
//--- TYPEDEFS ---------------------------------------------------------
typedef FbTk::RefCount<OpenGLShaderProgram> OpenGLShaderProgramPtr;
}
#endif // FBCOMPOSITOR_OPENGLSHADERS_HH
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