src/mesa/main/extensions.c

   1 /* $Id: extensions.c,v 1.15 1999/12/10 15:13:57 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   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 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "context.h"
  33 #include "extensions.h"
  34 #include "mem.h"
  35 #include "simple_list.h"
  36 #include "types.h"
  37 #endif
  38
  39
  40 #define MAX_EXT_NAMELEN 80
  41
  42 struct extension {
  43    struct extension *next, *prev;
  44    int enabled;
  45    char name[MAX_EXT_NAMELEN+1];
  46    void (*notify)( GLcontext *, GLboolean );
  47 };
  48
  49
  50
  51 static struct { int enabled; const char *name; } default_extensions[] = {
  52    { ALWAYS_ENABLED, "GL_EXT_blend_color" },
  53    { DEFAULT_OFF,    "ARB_imaging" },
  54    { DEFAULT_ON,     "GL_EXT_blend_minmax" },
  55    { DEFAULT_ON,     "GL_EXT_blend_logic_op" },
  56    { DEFAULT_ON,     "GL_EXT_blend_subtract" },
  57    { DEFAULT_ON,     "GL_EXT_paletted_texture" },
  58    { DEFAULT_ON,     "GL_EXT_point_parameters" },
  59    { ALWAYS_ENABLED, "GL_EXT_polygon_offset" },
  60    { ALWAYS_ENABLED, "GL_EXT_vertex_array" },
  61    { ALWAYS_ENABLED, "GL_EXT_texture_object" },
  62    { DEFAULT_ON,     "GL_EXT_texture3D" },
  63    { ALWAYS_ENABLED, "GL_MESA_window_pos" },
  64    { ALWAYS_ENABLED, "GL_MESA_resize_buffers" },
  65    { ALWAYS_ENABLED, "GL_EXT_shared_texture_palette" },
  66    { ALWAYS_ENABLED, "GL_EXT_rescale_normal" },
  67    { ALWAYS_ENABLED, "GL_EXT_abgr" },
  68    { ALWAYS_ENABLED, "GL_SGIS_texture_edge_clamp" },
  69    { ALWAYS_ENABLED, "GL_EXT_stencil_wrap" },
  70    { DEFAULT_ON,     "GL_INGR_blend_func_separate" },
  71    { DEFAULT_ON,     "GL_ARB_multitexture" },
  72    { ALWAYS_ENABLED, "GL_NV_texgen_reflection" },
  73    { DEFAULT_ON,     "GL_PGI_misc_hints" },
  74    { DEFAULT_ON,     "GL_EXT_compiled_vertex_array" },
  75    { DEFAULT_OFF,    "GL_EXT_vertex_array_set" },
  76    { DEFAULT_ON,     "GL_EXT_clip_volume_hint" },
  77    { DEFAULT_ON,     "GL_EXT_texture_env_add" },
  78 };
  79
  80
  81 int gl_extensions_add( GLcontext *ctx,
  82                        int state,
  83                        const char *name,
  84                        void (*notify)(void) )
  85 {
  86    (void) notify;
  87
  88    if (ctx->Extensions.ext_string == 0)
  89    {
  90       struct extension *t = MALLOC_STRUCT(extension);
  91       t->enabled = state;
  92       strncpy(t->name, name, MAX_EXT_NAMELEN);
  93       t->name[MAX_EXT_NAMELEN] = 0;
  94       t->notify = (void (*)(GLcontext *, GLboolean)) notify;
  95       insert_at_tail( ctx->Extensions.ext_list, t );
  96       return 0;
  97    }
  98    return 1;
  99 }
 100
 101
 102 static int set_extension( GLcontext *ctx, const char *name, GLuint state )
 103 {
 104    struct extension *i;
 105    foreach( i, ctx->Extensions.ext_list )
 106       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
 107          break;
 108
 109    if (i == ctx->Extensions.ext_list) return 1;
 110
 111    if (i->enabled && !(i->enabled & ALWAYS_ENABLED))
 112    {
 113       if (i->notify) i->notify( ctx, state );
 114       i->enabled = state;
 115    }
 116
 117    return 0;
 118 }
 119
 120
 121 int gl_extensions_enable( GLcontext *ctx, const char *name )
 122 {
 123    if (ctx->Extensions.ext_string == 0)
 124       return set_extension( ctx, name, 1 );
 125    return 1;
 126 }
 127
 128
 129 int gl_extensions_disable( GLcontext *ctx, const char *name )
 130 {
 131    if (ctx->Extensions.ext_string == 0)
 132       return set_extension( ctx, name, 0 );
 133    return 1;
 134 }
 135
 136
 137 /*
 138  * Test if the named extension is enabled in this context.
 139  */
 140 GLboolean gl_extension_is_enabled( GLcontext *ctx, const char *name)
 141 {
 142    struct extension *i;
 143    foreach( i, ctx->Extensions.ext_list )
 144       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) {
 145          if (i->enabled)
 146             return GL_TRUE;
 147          else
 148             return GL_FALSE;
 149       }
 150
 151    return GL_FALSE;
 152 }
 153
 154
 155 void gl_extensions_dtr( GLcontext *ctx )
 156 {
 157    struct extension *i, *nexti;
 158
 159    if (ctx->Extensions.ext_string) {
 160       FREE( ctx->Extensions.ext_string );
 161       ctx->Extensions.ext_string = 0;
 162    }
 163
 164    if (ctx->Extensions.ext_list) {
 165       foreach_s( i, nexti, ctx->Extensions.ext_list ) {
 166          remove_from_list( i );
 167          FREE( i );
 168       }
 169
 170       FREE(ctx->Extensions.ext_list);
 171       ctx->Extensions.ext_list = 0;
 172    }
 173 }
 174
 175
 176 void gl_extensions_ctr( GLcontext *ctx )
 177 {
 178    GLuint i;
 179
 180    ctx->Extensions.ext_string = 0;
 181    ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
 182    make_empty_list( ctx->Extensions.ext_list );
 183
 184    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 185       gl_extensions_add( ctx,
 186                          default_extensions[i].enabled,
 187                          default_extensions[i].name,
 188                          0 );
 189    }
 190 }
 191
 192
 193 const char *gl_extensions_get_string( GLcontext *ctx )
 194 {
 195    if (ctx->Extensions.ext_string == 0)
 196    {
 197       struct extension *i;
 198       char *str;
 199       GLuint len = 0;
 200       foreach (i, ctx->Extensions.ext_list)
 201          if (i->enabled)
 202             len += strlen(i->name) + 1;
 203
 204       if (len == 0)
 205          return "";
 206
 207       str = (char *)MALLOC(len * sizeof(char));
 208       ctx->Extensions.ext_string = str;
 209
 210       foreach (i, ctx->Extensions.ext_list)
 211          if (i->enabled) {
 212             strcpy(str, i->name);
 213             str += strlen(str);
 214             *str++ = ' ';
 215          }
 216
 217       *(str-1) = 0;
 218    }
 219
 220    return ctx->Extensions.ext_string;
 221 }