src/mesa/main/extensions.c

   1 /* $Id: extensions.c,v 1.1 1999/08/19 00:55:41 jtg Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.1
   6  *
   7  * Copyright (C) 1999  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  */
  26
  27
  28 #include <stdlib.h>
  29 #include "extensions.h"
  30 #include "simple_list.h"
  31 #include "types.h"
  32
  33 #define MAX_EXT_NAMELEN 80
  34 #define MALLOC_STRUCT(T)  (struct T *) malloc( sizeof(struct T) )
  35
  36 struct extension {
  37    struct extension *next, *prev;
  38    int enabled;
  39    char name[MAX_EXT_NAMELEN+1];
  40    void (*notify)( GLcontext *, GLboolean );
  41 };
  42
  43
  44
  45 static struct { int enabled; const char *name; } default_extensions[] = {
  46    { ALWAYS_ENABLED, "GL_EXT_blend_color" },
  47    { ALWAYS_ENABLED, "GL_EXT_blend_minmax" },
  48    { ALWAYS_ENABLED, "GL_EXT_blend_logic_op" },
  49    { ALWAYS_ENABLED, "GL_EXT_blend_subtract" },
  50    { ALWAYS_ENABLED, "GL_EXT_paletted_texture" },
  51    { DEFAULT_ON,     "GL_EXT_point_parameters" },
  52    { ALWAYS_ENABLED, "GL_EXT_polygon_offset" },
  53    { ALWAYS_ENABLED, "GL_EXT_vertex_array" },
  54    { ALWAYS_ENABLED, "GL_EXT_texture_object" },
  55    { DEFAULT_ON,     "GL_EXT_texture3D" },
  56    { ALWAYS_ENABLED, "GL_MESA_window_pos" },
  57    { ALWAYS_ENABLED, "GL_MESA_resize_buffers" },
  58    { ALWAYS_ENABLED, "GL_EXT_shared_texture_palette" },
  59    { ALWAYS_ENABLED, "GL_EXT_rescale_normal" },
  60    { ALWAYS_ENABLED, "GL_EXT_abgr" },
  61    { ALWAYS_ENABLED, "GL_SGIS_texture_edge_clamp" },
  62    { ALWAYS_ENABLED, "GL_EXT_stencil_wrap" },
  63    { ALWAYS_ENABLED, "GL_INGR_blend_func_separate" },
  64    { DEFAULT_ON,     "GL_ARB_multitexture" },
  65    { ALWAYS_ENABLED, "GL_NV_texgen_reflection" },
  66    { DEFAULT_ON,     "GL_PGI_misc_hints" },
  67    { DEFAULT_ON,     "GL_EXT_compiled_vertex_array" },
  68    { DEFAULT_OFF,    "GL_EXT_vertex_array_set" },
  69    { DEFAULT_ON,     "GL_EXT_clip_volume_hint" },
  70 };
  71
  72
  73 int gl_extensions_add( GLcontext *ctx,
  74                        int state,
  75                        const char *name,
  76                        void (*notify)() )
  77 {
  78    (void) notify;
  79
  80    if (ctx->Extensions.ext_string == 0)
  81    {
  82       struct extension *t = MALLOC_STRUCT(extension);
  83       t->enabled = state;
  84       strncpy(t->name, name, MAX_EXT_NAMELEN);
  85       t->name[MAX_EXT_NAMELEN] = 0;
  86       t->notify = (void (*)(GLcontext *, GLboolean)) notify;
  87       insert_at_tail( ctx->Extensions.ext_list, t );
  88       return 0;
  89    }
  90    return 1;
  91 }
  92
  93
  94 static int set_extension( GLcontext *ctx, const char *name, GLuint state )
  95 {
  96    struct extension *i;
  97    foreach( i, ctx->Extensions.ext_list )
  98       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
  99          break;
 100
 101    if (i == ctx->Extensions.ext_list) return 1;
 102
 103    if (i->enabled && !(i->enabled & ALWAYS_ENABLED))
 104    {
 105       if (i->notify) i->notify( ctx, state );
 106       i->enabled = state;
 107    }
 108
 109    return 0;
 110 }
 111
 112
 113 int gl_extensions_enable( GLcontext *ctx, const char *name )
 114 {
 115    if (ctx->Extensions.ext_string == 0)
 116       return set_extension( ctx, name, 1 );
 117    return 1;
 118 }
 119
 120
 121 int gl_extensions_disable( GLcontext *ctx, const char *name )
 122 {
 123    if (ctx->Extensions.ext_string == 0)
 124       return set_extension( ctx, name, 0 );
 125    return 1;
 126 }
 127
 128
 129 void gl_extensions_dtr( GLcontext *ctx )
 130 {
 131    struct extension *i, *nexti;
 132
 133    if (ctx->Extensions.ext_string) {
 134       free( ctx->Extensions.ext_string );
 135       ctx->Extensions.ext_string = 0;
 136    }
 137
 138    if (ctx->Extensions.ext_list) {
 139       foreach_s( i, nexti, ctx->Extensions.ext_list ) {
 140          free( i );
 141       }
 142
 143       free(ctx->Extensions.ext_list);
 144       ctx->Extensions.ext_list = 0;
 145    }
 146 }
 147
 148
 149 void gl_extensions_ctr( GLcontext *ctx )
 150 {
 151    GLuint i;
 152
 153    ctx->Extensions.ext_string = 0;
 154    ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
 155    make_empty_list( ctx->Extensions.ext_list );
 156
 157    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 158       gl_extensions_add( ctx,
 159                          default_extensions[i].enabled,
 160                          default_extensions[i].name,
 161                          0 );
 162    }
 163 }
 164
 165
 166 const char *gl_extensions_get_string( GLcontext *ctx )
 167 {
 168    if (ctx->Extensions.ext_string == 0)
 169    {
 170       struct extension *i;
 171       char *str;
 172       GLuint len = 0;
 173       foreach (i, ctx->Extensions.ext_list)
 174          if (i->enabled)
 175             len += strlen(i->name) + 1;
 176
 177       if (len == 0)
 178          return "";
 179
 180       str = (char *)malloc(len * sizeof(char));
 181       ctx->Extensions.ext_string = str;
 182
 183       foreach (i, ctx->Extensions.ext_list)
 184          if (i->enabled) {
 185             strcpy(str, i->name);
 186             str += strlen(str);
 187             *str++ = ' ';
 188          }
 189
 190       *(str-1) = 0;
 191    }
 192
 193    return ctx->Extensions.ext_string;
 194 }
 195
 196