src/mesa/main/extensions.c

   1 /* $Id: extensions.c,v 1.25 2000/05/04 13:48:49 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" },
  53    { DEFAULT_ON,     "GL_ARB_multitexture" },
  54    { ALWAYS_ENABLED, "GL_ARB_tranpose_matrix" },
  55    { ALWAYS_ENABLED, "GL_EXT_abgr" },
  56    { DEFAULT_ON,     "GL_EXT_blend_color" },
  57    { DEFAULT_ON,     "GL_EXT_blend_logic_op" },
  58    { DEFAULT_ON,     "GL_EXT_blend_minmax" },
  59    { DEFAULT_ON,     "GL_EXT_blend_subtract" },
  60    { DEFAULT_ON,     "GL_EXT_clip_volume_hint" },
  61    { DEFAULT_ON,     "GL_EXT_compiled_vertex_array" },
  62    { DEFAULT_ON,     "GL_EXT_histogram" },
  63    { DEFAULT_ON,     "GL_EXT_paletted_texture" },
  64    { DEFAULT_ON,     "GL_EXT_point_parameters" },
  65    { ALWAYS_ENABLED, "GL_EXT_polygon_offset" },
  66    { ALWAYS_ENABLED, "GL_EXT_rescale_normal" },
  67    { DEFAULT_ON,     "GL_EXT_shared_texture_palette" },
  68    { ALWAYS_ENABLED, "GL_EXT_stencil_wrap" },
  69    { DEFAULT_ON,     "GL_EXT_texture3D" },
  70    { DEFAULT_OFF,    "GL_EXT_texture_env" },
  71    { DEFAULT_ON,     "GL_EXT_texture_env_add" },
  72    { ALWAYS_ENABLED, "GL_EXT_texture_object" },
  73    { DEFAULT_ON,     "GL_EXT_texture_lod_bias" },
  74    { ALWAYS_ENABLED, "GL_EXT_vertex_array" },
  75    { DEFAULT_OFF,    "GL_EXT_vertex_array_set" },
  76    { DEFAULT_OFF,    "GL_HP_occlusion_test" },
  77    { DEFAULT_ON,     "GL_INGR_blend_func_separate" },
  78    { ALWAYS_ENABLED, "GL_MESA_window_pos" },
  79    { ALWAYS_ENABLED, "GL_MESA_resize_buffers" },
  80    { ALWAYS_ENABLED, "GL_NV_texgen_reflection" },
  81    { DEFAULT_ON,     "GL_PGI_misc_hints" },
  82    { DEFAULT_ON,     "GL_SGI_color_matrix" },
  83    { DEFAULT_ON,     "GL_SGI_color_table" },
  84    { DEFAULT_ON,     "GL_SGIS_pixel_texture" },
  85    { DEFAULT_ON,     "GL_SGIS_texture_edge_clamp" },
  86    { DEFAULT_ON,     "GL_SGIX_pixel_texture" }
  87 };
  88
  89
  90 /*
  91  * Update the boolean convenience flags in the Extensions struct.
  92  */
  93 static void
  94 update_extension_flags( GLcontext *ctx )
  95 {
  96    /* Update flags */
  97    ctx->Extensions.HaveTextureEnvAdd = gl_extension_is_enabled(ctx, "GL_EXT_texture_env_add");
  98    ctx->Extensions.HaveTextureLodBias = gl_extension_is_enabled(ctx, "GL_EXT_texture_lod_bias");
  99    ctx->Extensions.HaveHpOcclusionTest = gl_extension_is_enabled(ctx, "GL_HP_occlusion_test");
 100 }
 101
 102
 103
 104 int gl_extensions_add( GLcontext *ctx,
 105                        int state,
 106                        const char *name,
 107                        void (*notify)(void) )
 108 {
 109    (void) notify;
 110
 111    if (ctx->Extensions.ext_string == 0)
 112    {
 113       struct extension *t = MALLOC_STRUCT(extension);
 114       t->enabled = state;
 115       strncpy(t->name, name, MAX_EXT_NAMELEN);
 116       t->name[MAX_EXT_NAMELEN] = 0;
 117       t->notify = (void (*)(GLcontext *, GLboolean)) notify;
 118       insert_at_tail( ctx->Extensions.ext_list, t );
 119       return 0;
 120    }
 121    return 1;
 122 }
 123
 124
 125 /*
 126  * Either enable or disable the named extension.
 127  */
 128 static int set_extension( GLcontext *ctx, const char *name, GLint state )
 129 {
 130    struct extension *i;
 131    foreach( i, ctx->Extensions.ext_list )
 132       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
 133          break;
 134
 135    if (i == ctx->Extensions.ext_list)
 136       return 1;
 137
 138    if (!(i->enabled & ALWAYS_ENABLED)) {
 139       if (i->notify) i->notify( ctx, state );
 140       i->enabled = state;
 141    }
 142
 143    update_extension_flags(ctx);
 144
 145    return 0;
 146 }
 147
 148
 149 int gl_extensions_enable( GLcontext *ctx, const char *name )
 150 {
 151    if (ctx->Extensions.ext_string == 0)
 152       return set_extension( ctx, name, 1 );
 153    return 1;
 154 }
 155
 156
 157 int gl_extensions_disable( GLcontext *ctx, const char *name )
 158 {
 159    if (ctx->Extensions.ext_string == 0)
 160       return set_extension( ctx, name, 0 );
 161    return 1;
 162 }
 163
 164
 165 /*
 166  * Test if the named extension is enabled in this context.
 167  */
 168 GLboolean gl_extension_is_enabled( GLcontext *ctx, const char *name)
 169 {
 170    struct extension *i;
 171    foreach( i, ctx->Extensions.ext_list )
 172       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) {
 173          if (i->enabled)
 174             return GL_TRUE;
 175          else
 176             return GL_FALSE;
 177       }
 178
 179    return GL_FALSE;
 180 }
 181
 182
 183 void gl_extensions_dtr( GLcontext *ctx )
 184 {
 185    struct extension *i, *nexti;
 186
 187    if (ctx->Extensions.ext_string) {
 188       FREE( ctx->Extensions.ext_string );
 189       ctx->Extensions.ext_string = 0;
 190    }
 191
 192    if (ctx->Extensions.ext_list) {
 193       foreach_s( i, nexti, ctx->Extensions.ext_list ) {
 194          remove_from_list( i );
 195          FREE( i );
 196       }
 197
 198       FREE(ctx->Extensions.ext_list);
 199       ctx->Extensions.ext_list = 0;
 200    }
 201 }
 202
 203
 204 void gl_extensions_ctr( GLcontext *ctx )
 205 {
 206    GLuint i;
 207
 208    ctx->Extensions.ext_string = 0;
 209    ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
 210    make_empty_list( ctx->Extensions.ext_list );
 211
 212    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 213       gl_extensions_add( ctx,
 214                          default_extensions[i].enabled,
 215                          default_extensions[i].name,
 216                          0 );
 217    }
 218    update_extension_flags(ctx);
 219 }
 220
 221
 222 const char *gl_extensions_get_string( GLcontext *ctx )
 223 {
 224    if (ctx->Extensions.ext_string == 0)
 225    {
 226       struct extension *i;
 227       char *str;
 228       GLuint len = 0;
 229       foreach (i, ctx->Extensions.ext_list)
 230          if (i->enabled)
 231             len += strlen(i->name) + 1;
 232
 233       if (len == 0)
 234          return "";
 235
 236       str = (char *)MALLOC(len * sizeof(char));
 237       ctx->Extensions.ext_string = str;
 238
 239       foreach (i, ctx->Extensions.ext_list)
 240          if (i->enabled) {
 241             strcpy(str, i->name);
 242             str += strlen(str);
 243             *str++ = ' ';
 244          }
 245
 246       *(str-1) = 0;
 247    }
 248
 249    return ctx->Extensions.ext_string;
 250 }