/* ============================================================================
 * Freetype GL - A C OpenGL Freetype engine
 * Platform:    Any
 * WWW:         http://code.google.com/p/freetype-gl/
 * ----------------------------------------------------------------------------
 * Copyright 2011,2012,2013 Nicolas P. Rougier. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 * 
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY NICOLAS P. ROUGIER ''AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL NICOLAS P. ROUGIER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * The views and conclusions contained in the software and documentation are
 * those of the authors and should not be interpreted as representing official
 * policies, either expressed or implied, of Nicolas P. Rougier.
 * ----------------------------------------------------------------------------
 */
#ifndef __SHADER_H__
#define __SHADER_H__

#include "opengl.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @file   shader.h
 * @author Nicolas Rougier (Nicolas.Rougier@inria.fr)
 *
 * @defgroup shader Shader
 *
 * Simple functions for loading/building a shader from sources.
 *
 * <b>Example Usage</b>:
 * @code
 * #include "shader.h"
 *
 * int main( int arrgc, char *argv[] )
 * {
 *     GLuint shader = shader_load("shader.vert", "shader.frag");
 *
 *     return 0;
 * }
 * @endcode
 *
 * @{
 */

/**
 * Read a fragment or vertex shader from a file
 *
 * @param filename file to read shader from
 * @return         a newly-allocated text buffer containing code. This buffer
 *                 must be freed after usage.
 *
 */
  char *
  shader_read( const char *filename );


/**
 * Compile a shader from a text buffer.
 *
 * @param source code of the shader
 * @param type   type of the shader
 *
 * @return a handle on the compiled program
 *
 */
  GLuint
  shader_compile( const char* source,
                  const GLenum type );


/**
 * Load a vertex and fragment shader sources and build program
 *
 * @param  vert_filename vertex shader filename
 * @param  frag_filename fragment shader filename
 *
 * @return a handle on the built program
 *
 */
  GLuint
  shader_load( const char * vert_filename,
               const char * frag_filename );


/**
 *
 */
  GLuint
  shader_get( GLuint self,
              const char * name );

/** @} */

#ifdef __cplusplus
}
#endif

#endif /* __SHADER_H__ */