src/mesa/main/extensions.c

   1 /* $Id: extensions.c,v 1.29 2000/05/24 14:04:06 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_compression_s3tc" },
  75    { DEFAULT_OFF,    "GL_EXT_texture_env" },
  76    { DEFAULT_ON,     "GL_EXT_texture_env_add" },
  77    { ALWAYS_ENABLED, "GL_EXT_texture_object" },
  78    { DEFAULT_ON,     "GL_EXT_texture_lod_bias" },
  79    { ALWAYS_ENABLED, "GL_EXT_vertex_array" },
  80    { DEFAULT_OFF,    "GL_EXT_vertex_array_set" },
  81    { DEFAULT_OFF,    "GL_HP_occlusion_test" },
  82    { DEFAULT_ON,     "GL_INGR_blend_func_separate" },
  83    { ALWAYS_ENABLED, "GL_MESA_window_pos" },
  84    { ALWAYS_ENABLED, "GL_MESA_resize_buffers" },
  85    { ALWAYS_ENABLED, "GL_NV_texgen_reflection" },
  86    { DEFAULT_ON,     "GL_PGI_misc_hints" },
  87    { DEFAULT_ON,     "GL_SGI_color_matrix" },
  88    { DEFAULT_ON,     "GL_SGI_color_table" },
  89    { DEFAULT_ON,     "GL_SGIS_pixel_texture" },
  90    { DEFAULT_ON,     "GL_SGIS_texture_edge_clamp" },
  91    { DEFAULT_ON,     "GL_SGIX_pixel_texture" },
  92    { DEFAULT_OFF,    "GL_3DFX_texture_compression_FXT1" }
  93 };
  94
  95
  96 /*
  97  * Update the boolean convenience flags in the Extensions struct.
  98  */
  99 static void
 100 update_extension_flags( GLcontext *ctx )
 101 {
 102    /* Update flags */
 103    ctx->Extensions.HaveTextureEnvAdd = gl_extension_is_enabled(ctx, "GL_EXT_texture_env_add");
 104    ctx->Extensions.HaveTextureLodBias = gl_extension_is_enabled(ctx, "GL_EXT_texture_lod_bias");
 105    ctx->Extensions.HaveHpOcclusionTest = gl_extension_is_enabled(ctx, "GL_HP_occlusion_test");
 106    ctx->Extensions.HaveTextureCubeMap = gl_extension_is_enabled(ctx, "GL_ARB_texture_cube_map");
 107    ctx->Extensions.HaveTextureCompression = gl_extension_is_enabled(ctx, "GL_ARB_texture_compression");
 108    ctx->Extensions.HaveTextureCompressionS3TC = gl_extension_is_enabled(ctx, "GL_EXT_texture_compression_s3tc");
 109    ctx->Extensions.HaveTextureCompressionFXT1 = gl_extension_is_enabled(ctx, "GL_3DFX_texture_compression_FXT1");
 110 }
 111
 112
 113
 114 int gl_extensions_add( GLcontext *ctx,
 115                        int state,
 116                        const char *name,
 117                        void (*notify)(void) )
 118 {
 119    (void) notify;
 120
 121    if (ctx->Extensions.ext_string == 0)
 122    {
 123       struct extension *t = MALLOC_STRUCT(extension);
 124       t->enabled = state;
 125       strncpy(t->name, name, MAX_EXT_NAMELEN);
 126       t->name[MAX_EXT_NAMELEN] = 0;
 127       t->notify = (void (*)(GLcontext *, GLboolean)) notify;
 128       insert_at_tail( ctx->Extensions.ext_list, t );
 129       return 0;
 130    }
 131    return 1;
 132 }
 133
 134
 135 /*
 136  * Either enable or disable the named extension.
 137  */
 138 static int set_extension( GLcontext *ctx, const char *name, GLint state )
 139 {
 140    struct extension *i;
 141    foreach( i, ctx->Extensions.ext_list )
 142       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
 143          break;
 144
 145    if (i == ctx->Extensions.ext_list)
 146       return 1;
 147
 148    if (!(i->enabled & ALWAYS_ENABLED)) {
 149       if (i->notify) i->notify( ctx, state );
 150       i->enabled = state;
 151    }
 152
 153    update_extension_flags(ctx);
 154
 155    return 0;
 156 }
 157
 158
 159 int gl_extensions_enable( GLcontext *ctx, const char *name )
 160 {
 161    if (ctx->Extensions.ext_string == 0)
 162       return set_extension( ctx, name, 1 );
 163    return 1;
 164 }
 165
 166
 167 int gl_extensions_disable( GLcontext *ctx, const char *name )
 168 {
 169    if (ctx->Extensions.ext_string == 0)
 170       return set_extension( ctx, name, 0 );
 171    return 1;
 172 }
 173
 174
 175 /*
 176  * Test if the named extension is enabled in this context.
 177  */
 178 GLboolean gl_extension_is_enabled( GLcontext *ctx, const char *name)
 179 {
 180    struct extension *i;
 181    foreach( i, ctx->Extensions.ext_list )
 182       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) {
 183          if (i->enabled)
 184             return GL_TRUE;
 185          else
 186             return GL_FALSE;
 187       }
 188
 189    return GL_FALSE;
 190 }
 191
 192
 193 void gl_extensions_dtr( GLcontext *ctx )
 194 {
 195    struct extension *i, *nexti;
 196
 197    if (ctx->Extensions.ext_string) {
 198       FREE( ctx->Extensions.ext_string );
 199       ctx->Extensions.ext_string = 0;
 200    }
 201
 202    if (ctx->Extensions.ext_list) {
 203       foreach_s( i, nexti, ctx->Extensions.ext_list ) {
 204          remove_from_list( i );
 205          FREE( i );
 206       }
 207
 208       FREE(ctx->Extensions.ext_list);
 209       ctx->Extensions.ext_list = 0;
 210    }
 211 }
 212
 213
 214 void gl_extensions_ctr( GLcontext *ctx )
 215 {
 216    GLuint i;
 217
 218    ctx->Extensions.ext_string = 0;
 219    ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
 220    make_empty_list( ctx->Extensions.ext_list );
 221
 222    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 223       gl_extensions_add( ctx,
 224                          default_extensions[i].enabled,
 225                          default_extensions[i].name,
 226                          0 );
 227    }
 228    update_extension_flags(ctx);
 229 }
 230
 231
 232 const char *gl_extensions_get_string( GLcontext *ctx )
 233 {
 234    if (ctx->Extensions.ext_string == 0)
 235    {
 236       struct extension *i;
 237       char *str;
 238       GLuint len = 0;
 239       foreach (i, ctx->Extensions.ext_list)
 240          if (i->enabled)
 241             len += strlen(i->name) + 1;
 242
 243       if (len == 0)
 244          return "";
 245
 246       str = (char *)MALLOC(len * sizeof(char));
 247       ctx->Extensions.ext_string = str;
 248
 249       foreach (i, ctx->Extensions.ext_list)
 250          if (i->enabled) {
 251             strcpy(str, i->name);
 252             str += strlen(str);
 253             *str++ = ' ';
 254          }
 255
 256       *(str-1) = 0;
 257    }
 258
 259    return ctx->Extensions.ext_string;
 260 }