/**

  * $Id: gl_common.h,v 1.5 2007-10-31 09:10:23 nkeynes Exp $

  *

  * Parent for all X11 display drivers.

  *

  * Copyright (c) 2005 Nathan Keynes.

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program 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 General Public License for more details.

  */

 #ifndef video_gl_common_H

 #define video_gl_common_H

 #include "display.h"

 /**

  * Test if a specific extension is supported. From opengl.org

  * @param extension extension name to check for

  * @return TRUE if supported, otherwise FALSE.

  */

 gboolean isGLExtensionSupported( const char *extension );

 gboolean hasRequiredGLExtensions();

 /**

  * Generic GL routine to draw the given frame buffer into a render buffer

  */

 gboolean gl_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer );

 /**

  * Generic GL routine to blank the display view with the specified colour.

  */

 gboolean gl_display_blank( uint32_t colour );

 /**

  * Write a rectangular texture (GL_TEXTURE_RECTANGLE_ARB) to the display frame

  */

 void gl_display_render_buffer( render_buffer_t buffer );

 /**

  * Redisplay the last frame.

  */

 void gl_redisplay_last();

 /**

  * Generic GL read_render_buffer. This function assumes that the caller

  * has already set the appropriate glReadBuffer(); in other words, unless

  * there's only one buffer this needs to be wrapped.

  */

 gboolean gl_read_render_buffer( unsigned char *target, render_buffer_t buffer, 

 				int rowstride, int colour_format );

 /****** FBO handling (gl_fbo.c) ******/

 gboolean gl_fbo_is_supported();

 void gl_fbo_shutdown();

 void gl_fbo_init( display_driver_t driver );

 void gl_fbo_detach();

 /****** Shader handling (gl_sl.c) *****/

 gboolean glsl_is_supported(void);

 gboolean glsl_load_shaders( const char *vert_shader, const char *frag_shader );

 void glsl_unload_shaders(void);

 extern const char *glsl_vertex_shader_src;

 extern const char *glsl_fragment_shader_src;

 #endif /* !video_gl_common_H */