// ----------------------------------------------------------------------------
// OpenGL Anti-Grain Geometry (GL-AGG) - Version 0.1
// A high quality OpenGL rendering engine for C
// Copyright (C) 2012 Nicolas P. Rougier. All rights reserved.
// Contact: Nicolas.Rougier@gmail.com
//          http://code.google.com/p/gl-agg/
//
// 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 );

  /* 0 to indicate success: */
  int freetypegl_init(void);

/** @} */

#ifdef __cplusplus
}
#endif

#endif // __SHADER_H__