/*
 * Cogl
 *
 * A Low Level GPU Graphics and Utilities API
 *
 * Copyright (C) 2009 Intel Corporation.
 *
 * 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 __COGL_FEATURE_PRIVATE_H
#define __COGL_FEATURE_PRIVATE_H

#include <glib.h>

#include "cogl-context.h"
#include "cogl-renderer.h"

#define COGL_CHECK_GL_VERSION(driver_major, driver_minor, \
                              target_major, target_minor) \
  ((driver_major) > (target_major) || \
   ((driver_major) == (target_major) && (driver_minor) >= (target_minor)))

typedef enum
{
  COGL_EXT_IN_GL = (1 << 0),
  COGL_EXT_IN_GLES2 = (1 << 1),
  COGL_EXT_IN_GLES3 = (1 << 2)
} CoglExtGlesAvailability;

typedef struct _CoglFeatureFunction CoglFeatureFunction;

struct _CoglFeatureFunction
{
  /* The name of the function without the "EXT" or "ARB" suffix */
  const char *name;
  /* The offset in the context of where to store the function pointer */
  unsigned int pointer_offset;
};

typedef struct _CoglFeatureData CoglFeatureData;

struct _CoglFeatureData
{
  /* A minimum GL version which the functions should be defined in
     without needing an extension. Set to 255,255 if it's only
     provided in an extension */
  int min_gl_major, min_gl_minor;
  /* Flags specifying which versions of GLES the feature is available
     in core in */
  CoglExtGlesAvailability gles_availability;
  /* \0 separated list of namespaces to try. Eg "EXT\0ARB\0" */
  const char *namespaces;
  /* \0 separated list of required extension names without the GL_EXT
     or GL_ARB prefix. Any of the extensions must be available for the
     feature to be considered available. If the suffix for an
     extension is different from the namespace, you can specify it
     with a ':' after the namespace */
  const char *extension_names;
  /* A set of feature flags to enable if the extension is available */
  CoglFeatureFlags feature_flags;
  /* A set of private feature flags to enable if the extension is
   * available */
  int feature_flags_private;
  /* An optional corresponding winsys feature. */
  CoglWinsysFeature winsys_feature;
  /* A list of functions required for this feature. Terminated with a
     NULL name */
  const CoglFeatureFunction *functions;
};

gboolean
_cogl_feature_check (CoglRenderer *renderer,
                     const char *driver_prefix,
                     const CoglFeatureData *data,
                     int gl_major,
                     int gl_minor,
                     CoglDriver driver,
                     char * const *extensions,
                     void *function_table);

void
_cogl_feature_check_ext_functions (CoglContext *context,
                                   int gl_major,
                                   int gl_minor,
                                   char * const *gl_extensions);

#endif /* __COGL_FEATURE_PRIVATE_H */
