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      1 /**
      2  * \file extensions.h
      3  * Extension handling.
      4  *
      5  * \if subset
      6  * (No-op)
      7  *
      8  * \endif
      9  */
     10 
     11 /*
     12  * Mesa 3-D graphics library
     13  *
     14  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
     15  *
     16  * Permission is hereby granted, free of charge, to any person obtaining a
     17  * copy of this software and associated documentation files (the "Software"),
     18  * to deal in the Software without restriction, including without limitation
     19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     20  * and/or sell copies of the Software, and to permit persons to whom the
     21  * Software is furnished to do so, subject to the following conditions:
     22  *
     23  * The above copyright notice and this permission notice shall be included
     24  * in all copies or substantial portions of the Software.
     25  *
     26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     27  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     28  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     29  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     30  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     31  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     32  * OTHER DEALINGS IN THE SOFTWARE.
     33  */
     34 
     35 
     36 #ifndef _EXTENSIONS_H_
     37 #define _EXTENSIONS_H_
     38 
     39 #include "glheader.h"
     40 
     41 #ifdef __cplusplus
     42 extern "C" {
     43 #endif
     44 
     45 struct gl_context;
     46 struct gl_extensions;
     47 
     48 extern void _mesa_enable_sw_extensions(struct gl_context *ctx);
     49 
     50 extern void _mesa_one_time_init_extension_overrides(void);
     51 
     52 extern void _mesa_init_extensions(struct gl_extensions *extentions);
     53 
     54 extern GLubyte *_mesa_make_extension_string(struct gl_context *ctx);
     55 
     56 extern GLuint
     57 _mesa_get_extension_count(struct gl_context *ctx);
     58 
     59 extern const GLubyte *
     60 _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index);
     61 
     62 
     63 /**
     64  * \brief An element of the \c extension_table.
     65  */
     66 struct mesa_extension {
     67    /** Name of extension, such as "GL_ARB_depth_clamp". */
     68    const char *name;
     69 
     70    /** Offset (in bytes) of the corresponding member in struct gl_extensions. */
     71    size_t offset;
     72 
     73    /** Minimum version the extension requires for the given API
     74     * (see gl_api defined in mtypes.h). The value is equal to:
     75     * 10 * major_version + minor_version
     76     */
     77    uint8_t version[API_OPENGL_LAST + 1];
     78 
     79    /** Year the extension was proposed or approved.  Used to sort the
     80     * extension string chronologically. */
     81    uint16_t year;
     82 };
     83 
     84 extern const struct mesa_extension _mesa_extension_table[];
     85 
     86 
     87 /* Generate enums for the functions below */
     88 enum {
     89 #define EXT(name_str, ...) MESA_EXTENSION_##name_str,
     90 #include "extensions_table.h"
     91 #undef EXT
     92 MESA_EXTENSION_COUNT
     93 };
     94 
     95 
     96 /** Checks if the context supports a user-facing extension */
     97 #define EXT(name_str, driver_cap, ...) \
     98 static inline bool \
     99 _mesa_has_##name_str(const struct gl_context *ctx) \
    100 { \
    101    return ctx->Extensions.driver_cap && (ctx->Extensions.Version >= \
    102           _mesa_extension_table[MESA_EXTENSION_##name_str].version[ctx->API]); \
    103 }
    104 #include "extensions_table.h"
    105 #undef EXT
    106 
    107 extern struct gl_extensions _mesa_extension_override_enables;
    108 extern struct gl_extensions _mesa_extension_override_disables;
    109 
    110 #ifdef __cplusplus
    111 }
    112 #endif
    113 
    114 #endif
    115