src/mesa/main/extensions.c

   1 /* $Id: extensions.c,v 1.20 2000/03/11 23:23:26 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_ON,     "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    { DEFAULT_ON,     "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_ON,     "GL_EXT_clip_volume_hint" },
  76    { DEFAULT_ON,     "GL_EXT_texture_env_add" },
  77    { ALWAYS_ENABLED, "GL_ARB_tranpose_matrix" },
  78    { DEFAULT_OFF,    "GL_EXT_vertex_array_set" },
  79    { DEFAULT_OFF,    "GL_EXT_texture_env" },
  80    { DEFAULT_ON,     "GL_EXT_texture_lod_bias" },
  81    { DEFAULT_OFF,    "GL_HP_occlusion_test" }
  82 };
  83
  84
  85 /*
  86  * Update the boolean convenience flags in the Extensions struct.
  87  */
  88 static void
  89 update_extension_flags( GLcontext *ctx )
  90 {
  91    /* Update flags */
  92    ctx->Extensions.HaveTextureEnvAdd = gl_extension_is_enabled(ctx, "GL_EXT_texture_env_add");
  93    ctx->Extensions.HaveTextureLodBias = gl_extension_is_enabled(ctx, "GL_EXT_texture_lod_bias");
  94    ctx->Extensions.HaveHpOcclusionTest = gl_extension_is_enabled(ctx, "GL_HP_occlusion_test");
  95 }
  96
  97
  98
  99 int gl_extensions_add( GLcontext *ctx,
 100                        int state,
 101                        const char *name,
 102                        void (*notify)(void) )
 103 {
 104    (void) notify;
 105
 106    if (ctx->Extensions.ext_string == 0)
 107    {
 108       struct extension *t = MALLOC_STRUCT(extension);
 109       t->enabled = state;
 110       strncpy(t->name, name, MAX_EXT_NAMELEN);
 111       t->name[MAX_EXT_NAMELEN] = 0;
 112       t->notify = (void (*)(GLcontext *, GLboolean)) notify;
 113       insert_at_tail( ctx->Extensions.ext_list, t );
 114       return 0;
 115    }
 116    return 1;
 117 }
 118
 119
 120 /*
 121  * Either enable or disable the named extension.
 122  */
 123 static int set_extension( GLcontext *ctx, const char *name, GLint state )
 124 {
 125    struct extension *i;
 126    foreach( i, ctx->Extensions.ext_list )
 127       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
 128          break;
 129
 130    if (i == ctx->Extensions.ext_list)
 131       return 1;
 132
 133    if (i->enabled && !(i->enabled & ALWAYS_ENABLED)) {
 134       if (i->notify) i->notify( ctx, state );
 135       i->enabled = state;
 136    }
 137
 138    update_extension_flags(ctx);
 139
 140    return 0;
 141 }
 142
 143
 144 int gl_extensions_enable( GLcontext *ctx, const char *name )
 145 {
 146    if (ctx->Extensions.ext_string == 0)
 147       return set_extension( ctx, name, 1 );
 148    return 1;
 149 }
 150
 151
 152 int gl_extensions_disable( GLcontext *ctx, const char *name )
 153 {
 154    if (ctx->Extensions.ext_string == 0)
 155       return set_extension( ctx, name, 0 );
 156    return 1;
 157 }
 158
 159
 160 /*
 161  * Test if the named extension is enabled in this context.
 162  */
 163 GLboolean gl_extension_is_enabled( GLcontext *ctx, const char *name)
 164 {
 165    struct extension *i;
 166    foreach( i, ctx->Extensions.ext_list )
 167       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) {
 168          if (i->enabled)
 169             return GL_TRUE;
 170          else
 171             return GL_FALSE;
 172       }
 173
 174    return GL_FALSE;
 175 }
 176
 177
 178 void gl_extensions_dtr( GLcontext *ctx )
 179 {
 180    struct extension *i, *nexti;
 181
 182    if (ctx->Extensions.ext_string) {
 183       FREE( ctx->Extensions.ext_string );
 184       ctx->Extensions.ext_string = 0;
 185    }
 186
 187    if (ctx->Extensions.ext_list) {
 188       foreach_s( i, nexti, ctx->Extensions.ext_list ) {
 189          remove_from_list( i );
 190          FREE( i );
 191       }
 192
 193       FREE(ctx->Extensions.ext_list);
 194       ctx->Extensions.ext_list = 0;
 195    }
 196 }
 197
 198
 199 void gl_extensions_ctr( GLcontext *ctx )
 200 {
 201    GLuint i;
 202
 203    ctx->Extensions.ext_string = 0;
 204    ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
 205    make_empty_list( ctx->Extensions.ext_list );
 206
 207    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 208       gl_extensions_add( ctx,
 209                          default_extensions[i].enabled,
 210                          default_extensions[i].name,
 211                          0 );
 212    }
 213    update_extension_flags(ctx);
 214 }
 215
 216
 217 const char *gl_extensions_get_string( GLcontext *ctx )
 218 {
 219    if (ctx->Extensions.ext_string == 0)
 220    {
 221       struct extension *i;
 222       char *str;
 223       GLuint len = 0;
 224       foreach (i, ctx->Extensions.ext_list)
 225          if (i->enabled)
 226             len += strlen(i->name) + 1;
 227
 228       if (len == 0)
 229          return "";
 230
 231       str = (char *)MALLOC(len * sizeof(char));
 232       ctx->Extensions.ext_string = str;
 233
 234       foreach (i, ctx->Extensions.ext_list)
 235          if (i->enabled) {
 236             strcpy(str, i->name);
 237             str += strlen(str);
 238             *str++ = ' ';
 239          }
 240
 241       *(str-1) = 0;
 242    }
 243
 244    return ctx->Extensions.ext_string;
 245 }