src/mesa/main/extensions.c

   1 /* $Id: extensions.c,v 1.22 2000/04/07 16:27:26 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    { DEFAULT_ON,     "GL_SGIS_pixel_texture" },
  83    { DEFAULT_ON,     "GL_SGIX_pixel_texture" }
  84 };
  85
  86
  87 /*
  88  * Update the boolean convenience flags in the Extensions struct.
  89  */
  90 static void
  91 update_extension_flags( GLcontext *ctx )
  92 {
  93    /* Update flags */
  94    ctx->Extensions.HaveTextureEnvAdd = gl_extension_is_enabled(ctx, "GL_EXT_texture_env_add");
  95    ctx->Extensions.HaveTextureLodBias = gl_extension_is_enabled(ctx, "GL_EXT_texture_lod_bias");
  96    ctx->Extensions.HaveHpOcclusionTest = gl_extension_is_enabled(ctx, "GL_HP_occlusion_test");
  97 }
  98
  99
 100
 101 int gl_extensions_add( GLcontext *ctx,
 102                        int state,
 103                        const char *name,
 104                        void (*notify)(void) )
 105 {
 106    (void) notify;
 107
 108    if (ctx->Extensions.ext_string == 0)
 109    {
 110       struct extension *t = MALLOC_STRUCT(extension);
 111       t->enabled = state;
 112       strncpy(t->name, name, MAX_EXT_NAMELEN);
 113       t->name[MAX_EXT_NAMELEN] = 0;
 114       t->notify = (void (*)(GLcontext *, GLboolean)) notify;
 115       insert_at_tail( ctx->Extensions.ext_list, t );
 116       return 0;
 117    }
 118    return 1;
 119 }
 120
 121
 122 /*
 123  * Either enable or disable the named extension.
 124  */
 125 static int set_extension( GLcontext *ctx, const char *name, GLint state )
 126 {
 127    struct extension *i;
 128    foreach( i, ctx->Extensions.ext_list )
 129       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
 130          break;
 131
 132    if (i == ctx->Extensions.ext_list)
 133       return 1;
 134
 135    if (!(i->enabled & ALWAYS_ENABLED)) {
 136       if (i->notify) i->notify( ctx, state );
 137       i->enabled = state;
 138    }
 139
 140    update_extension_flags(ctx);
 141
 142    return 0;
 143 }
 144
 145
 146 int gl_extensions_enable( GLcontext *ctx, const char *name )
 147 {
 148    if (ctx->Extensions.ext_string == 0)
 149       return set_extension( ctx, name, 1 );
 150    return 1;
 151 }
 152
 153
 154 int gl_extensions_disable( GLcontext *ctx, const char *name )
 155 {
 156    if (ctx->Extensions.ext_string == 0)
 157       return set_extension( ctx, name, 0 );
 158    return 1;
 159 }
 160
 161
 162 /*
 163  * Test if the named extension is enabled in this context.
 164  */
 165 GLboolean gl_extension_is_enabled( GLcontext *ctx, const char *name)
 166 {
 167    struct extension *i;
 168    foreach( i, ctx->Extensions.ext_list )
 169       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) {
 170          if (i->enabled)
 171             return GL_TRUE;
 172          else
 173             return GL_FALSE;
 174       }
 175
 176    return GL_FALSE;
 177 }
 178
 179
 180 void gl_extensions_dtr( GLcontext *ctx )
 181 {
 182    struct extension *i, *nexti;
 183
 184    if (ctx->Extensions.ext_string) {
 185       FREE( ctx->Extensions.ext_string );
 186       ctx->Extensions.ext_string = 0;
 187    }
 188
 189    if (ctx->Extensions.ext_list) {
 190       foreach_s( i, nexti, ctx->Extensions.ext_list ) {
 191          remove_from_list( i );
 192          FREE( i );
 193       }
 194
 195       FREE(ctx->Extensions.ext_list);
 196       ctx->Extensions.ext_list = 0;
 197    }
 198 }
 199
 200
 201 void gl_extensions_ctr( GLcontext *ctx )
 202 {
 203    GLuint i;
 204
 205    ctx->Extensions.ext_string = 0;
 206    ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
 207    make_empty_list( ctx->Extensions.ext_list );
 208
 209    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 210       gl_extensions_add( ctx,
 211                          default_extensions[i].enabled,
 212                          default_extensions[i].name,
 213                          0 );
 214    }
 215    update_extension_flags(ctx);
 216 }
 217
 218
 219 const char *gl_extensions_get_string( GLcontext *ctx )
 220 {
 221    if (ctx->Extensions.ext_string == 0)
 222    {
 223       struct extension *i;
 224       char *str;
 225       GLuint len = 0;
 226       foreach (i, ctx->Extensions.ext_list)
 227          if (i->enabled)
 228             len += strlen(i->name) + 1;
 229
 230       if (len == 0)
 231          return "";
 232
 233       str = (char *)MALLOC(len * sizeof(char));
 234       ctx->Extensions.ext_string = str;
 235
 236       foreach (i, ctx->Extensions.ext_list)
 237          if (i->enabled) {
 238             strcpy(str, i->name);
 239             str += strlen(str);
 240             *str++ = ' ';
 241          }
 242
 243       *(str-1) = 0;
 244    }
 245
 246    return ctx->Extensions.ext_string;
 247 }