src/mesa/main/extensions.c

   1 /* $Id: extensions.c,v 1.28 2000/05/23 20:10:49 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  *
   7  * Copyright (C) 1999-2000  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    GLint 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    { DEFAULT_OFF,    "GL_ARB_imaging" },  /* in progress */
  53    { DEFAULT_ON,     "GL_ARB_multitexture" },
  54    { DEFAULT_OFF,    "GL_ARB_texture_compression" },  /* in progress */
  55    { DEFAULT_OFF,    "GL_ARB_texture_cube_map" },  /* in progress */
  56    { ALWAYS_ENABLED, "GL_ARB_tranpose_matrix" },
  57    { ALWAYS_ENABLED, "GL_EXT_abgr" },
  58    { DEFAULT_ON,     "GL_EXT_blend_color" },
  59    { DEFAULT_ON,     "GL_EXT_blend_func_separate" },
  60    { DEFAULT_ON,     "GL_EXT_blend_logic_op" },
  61    { DEFAULT_ON,     "GL_EXT_blend_minmax" },
  62    { DEFAULT_ON,     "GL_EXT_blend_subtract" },
  63    { DEFAULT_ON,     "GL_EXT_clip_volume_hint" },
  64    { DEFAULT_OFF,    "GL_EXT_convolution" },  /* in progress */
  65    { DEFAULT_ON,     "GL_EXT_compiled_vertex_array" },
  66    { DEFAULT_ON,     "GL_EXT_histogram" },
  67    { DEFAULT_ON,     "GL_EXT_paletted_texture" },
  68    { DEFAULT_ON,     "GL_EXT_point_parameters" },
  69    { ALWAYS_ENABLED, "GL_EXT_polygon_offset" },
  70    { ALWAYS_ENABLED, "GL_EXT_rescale_normal" },
  71    { DEFAULT_ON,     "GL_EXT_shared_texture_palette" },
  72    { ALWAYS_ENABLED, "GL_EXT_stencil_wrap" },
  73    { DEFAULT_ON,     "GL_EXT_texture3D" },
  74    { DEFAULT_OFF,    "GL_EXT_texture_env" },
  75    { DEFAULT_ON,     "GL_EXT_texture_env_add" },
  76    { ALWAYS_ENABLED, "GL_EXT_texture_object" },
  77    { DEFAULT_ON,     "GL_EXT_texture_lod_bias" },
  78    { ALWAYS_ENABLED, "GL_EXT_vertex_array" },
  79    { DEFAULT_OFF,    "GL_EXT_vertex_array_set" },
  80    { DEFAULT_OFF,    "GL_HP_occlusion_test" },
  81    { DEFAULT_ON,     "GL_INGR_blend_func_separate" },
  82    { ALWAYS_ENABLED, "GL_MESA_window_pos" },
  83    { ALWAYS_ENABLED, "GL_MESA_resize_buffers" },
  84    { ALWAYS_ENABLED, "GL_NV_texgen_reflection" },
  85    { DEFAULT_ON,     "GL_PGI_misc_hints" },
  86    { DEFAULT_ON,     "GL_SGI_color_matrix" },
  87    { DEFAULT_ON,     "GL_SGI_color_table" },
  88    { DEFAULT_ON,     "GL_SGIS_pixel_texture" },
  89    { DEFAULT_ON,     "GL_SGIS_texture_edge_clamp" },
  90    { DEFAULT_ON,     "GL_SGIX_pixel_texture" }
  91 };
  92
  93
  94 /*
  95  * Update the boolean convenience flags in the Extensions struct.
  96  */
  97 static void
  98 update_extension_flags( GLcontext *ctx )
  99 {
 100    /* Update flags */
 101    ctx->Extensions.HaveTextureEnvAdd = gl_extension_is_enabled(ctx, "GL_EXT_texture_env_add");
 102    ctx->Extensions.HaveTextureLodBias = gl_extension_is_enabled(ctx, "GL_EXT_texture_lod_bias");
 103    ctx->Extensions.HaveHpOcclusionTest = gl_extension_is_enabled(ctx, "GL_HP_occlusion_test");
 104    ctx->Extensions.HaveTextureCubeMap = gl_extension_is_enabled(ctx, "GL_ARB_texture_cube_map");
 105    ctx->Extensions.HaveTextureCompression = gl_extension_is_enabled(ctx, "GL_ARB_texture_compression");
 106 }
 107
 108
 109
 110 int gl_extensions_add( GLcontext *ctx,
 111                        int state,
 112                        const char *name,
 113                        void (*notify)(void) )
 114 {
 115    (void) notify;
 116
 117    if (ctx->Extensions.ext_string == 0)
 118    {
 119       struct extension *t = MALLOC_STRUCT(extension);
 120       t->enabled = state;
 121       strncpy(t->name, name, MAX_EXT_NAMELEN);
 122       t->name[MAX_EXT_NAMELEN] = 0;
 123       t->notify = (void (*)(GLcontext *, GLboolean)) notify;
 124       insert_at_tail( ctx->Extensions.ext_list, t );
 125       return 0;
 126    }
 127    return 1;
 128 }
 129
 130
 131 /*
 132  * Either enable or disable the named extension.
 133  */
 134 static int set_extension( GLcontext *ctx, const char *name, GLint state )
 135 {
 136    struct extension *i;
 137    foreach( i, ctx->Extensions.ext_list )
 138       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
 139          break;
 140
 141    if (i == ctx->Extensions.ext_list)
 142       return 1;
 143
 144    if (!(i->enabled & ALWAYS_ENABLED)) {
 145       if (i->notify) i->notify( ctx, state );
 146       i->enabled = state;
 147    }
 148
 149    update_extension_flags(ctx);
 150
 151    return 0;
 152 }
 153
 154
 155 int gl_extensions_enable( GLcontext *ctx, const char *name )
 156 {
 157    if (ctx->Extensions.ext_string == 0)
 158       return set_extension( ctx, name, 1 );
 159    return 1;
 160 }
 161
 162
 163 int gl_extensions_disable( GLcontext *ctx, const char *name )
 164 {
 165    if (ctx->Extensions.ext_string == 0)
 166       return set_extension( ctx, name, 0 );
 167    return 1;
 168 }
 169
 170
 171 /*
 172  * Test if the named extension is enabled in this context.
 173  */
 174 GLboolean gl_extension_is_enabled( GLcontext *ctx, const char *name)
 175 {
 176    struct extension *i;
 177    foreach( i, ctx->Extensions.ext_list )
 178       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) {
 179          if (i->enabled)
 180             return GL_TRUE;
 181          else
 182             return GL_FALSE;
 183       }
 184
 185    return GL_FALSE;
 186 }
 187
 188
 189 void gl_extensions_dtr( GLcontext *ctx )
 190 {
 191    struct extension *i, *nexti;
 192
 193    if (ctx->Extensions.ext_string) {
 194       FREE( ctx->Extensions.ext_string );
 195       ctx->Extensions.ext_string = 0;
 196    }
 197
 198    if (ctx->Extensions.ext_list) {
 199       foreach_s( i, nexti, ctx->Extensions.ext_list ) {
 200          remove_from_list( i );
 201          FREE( i );
 202       }
 203
 204       FREE(ctx->Extensions.ext_list);
 205       ctx->Extensions.ext_list = 0;
 206    }
 207 }
 208
 209
 210 void gl_extensions_ctr( GLcontext *ctx )
 211 {
 212    GLuint i;
 213
 214    ctx->Extensions.ext_string = 0;
 215    ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
 216    make_empty_list( ctx->Extensions.ext_list );
 217
 218    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 219       gl_extensions_add( ctx,
 220                          default_extensions[i].enabled,
 221                          default_extensions[i].name,
 222                          0 );
 223    }
 224    update_extension_flags(ctx);
 225 }
 226
 227
 228 const char *gl_extensions_get_string( GLcontext *ctx )
 229 {
 230    if (ctx->Extensions.ext_string == 0)
 231    {
 232       struct extension *i;
 233       char *str;
 234       GLuint len = 0;
 235       foreach (i, ctx->Extensions.ext_list)
 236          if (i->enabled)
 237             len += strlen(i->name) + 1;
 238
 239       if (len == 0)
 240          return "";
 241
 242       str = (char *)MALLOC(len * sizeof(char));
 243       ctx->Extensions.ext_string = str;
 244
 245       foreach (i, ctx->Extensions.ext_list)
 246          if (i->enabled) {
 247             strcpy(str, i->name);
 248             str += strlen(str);
 249             *str++ = ' ';
 250          }
 251
 252       *(str-1) = 0;
 253    }
 254
 255    return ctx->Extensions.ext_string;
 256 }