/*  SSNES - A frontend for libretro.
 *  Copyright (C) 2010-2012 - Hans-Kristian Arntzen
 * 
 *  SSNES 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 Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  SSNES 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.
 *
 *  You should have received a copy of the GNU General Public License along with SSNES.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __GL_COMMON_H
#define __GL_COMMON_H

#include "../general.h"

#ifdef HAVE_CONFIG_H
#include "../config.h"
#endif

#if defined(__APPLE__)
#include <OpenGL/gl.h>
#include <OpenGL/glext.h>
#elif defined(__CELLOS_LV2__)
#include <PSGL/psgl.h>
#include <PSGL/psglu.h>
#include <GLES/glext.h>
#else
#define GL_GLEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glext.h>
#endif

static inline bool gl_check_error(void)
{
   int error = glGetError();
   switch (error)
   {
      case GL_INVALID_ENUM:
         SSNES_ERR("GL: Invalid enum.\n");
         break;
      case GL_INVALID_VALUE:
         SSNES_ERR("GL: Invalid value. (You're not alone.)\n");
         break;
      case GL_INVALID_OPERATION:
         SSNES_ERR("GL: Invalid operation.\n");
         break;
      case GL_STACK_OVERFLOW:
         SSNES_ERR("GL: Stack overflow. (wtf)\n");
         break;
      case GL_STACK_UNDERFLOW:
         SSNES_ERR("GL: Stack underflow. (:v)\n");
         break;
      case GL_OUT_OF_MEMORY:
         SSNES_ERR("GL: Out of memory. Harhar.\n");
         break;
      case GL_NO_ERROR:
         return true;
      default:
         SSNES_ERR("Non specified error :v\n");
   }

   return false;
}

struct gl_fbo_rect
{
   unsigned img_width;
   unsigned img_height;
   unsigned max_img_width;
   unsigned max_img_height;
   unsigned width;
   unsigned height;
};

enum gl_scale_type
{
   SSNES_SCALE_ABSOLUTE,
   SSNES_SCALE_INPUT,
   SSNES_SCALE_VIEWPORT
};

struct gl_fbo_scale
{
   enum gl_scale_type type_x;
   enum gl_scale_type type_y;
   float scale_x;
   float scale_y;
   unsigned abs_x;
   unsigned abs_y;
   bool valid;
};

struct gl_tex_info
{
   GLuint tex;
   GLfloat input_size[2];
   GLfloat tex_size[2];
   GLfloat coord[8];
};

// Windows ... <_<
#if (defined(HAVE_XML) || defined(HAVE_CG)) && defined(_WIN32)
extern PFNGLCLIENTACTIVETEXTUREPROC pglClientActiveTexture;
extern PFNGLACTIVETEXTUREPROC pglActiveTexture;
#else
#define pglClientActiveTexture glClientActiveTexture
#define pglActiveTexture glActiveTexture
#endif

#endif
