src/mesa/main/extensions.c

   1 /* $Id: extensions.c,v 1.40 2000/10/30 16:27:21 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   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    GLboolean *flag;                     /* optional flag stored elsewhere */
  46    char name[MAX_EXT_NAMELEN+1];
  47    void (*notify)( GLcontext *, GLboolean );
  48 };
  49
  50 #define F(x) (int)&(((struct gl_extensions *)0)->x)
  51 #define ON GL_TRUE
  52 #define OFF GL_FALSE
  53
  54 static struct {
  55    GLboolean enabled;
  56    const char *name;
  57    int flag_offset;
  58 } default_extensions[] = {
  59    { ON,  "GL_ARB_imaging",                   F(ARB_imaging) },
  60    { ON,  "GL_ARB_multitexture",              F(ARB_multitexture) },
  61    { OFF, "GL_ARB_texture_compression",       F(ARB_texture_compression) },
  62    { OFF, "GL_ARB_texture_cube_map",          F(ARB_texture_cube_map) },
  63    { ON,  "GL_ARB_texture_env_add",           F(ARB_texture_env_add) },
  64    { ON,  "GL_ARB_tranpose_matrix",           0 },
  65    { ON,  "GL_EXT_abgr",                      0 },
  66    { OFF, "GL_EXT_bgra",                      0 },
  67    { ON,  "GL_EXT_blend_color",               F(EXT_blend_color) },
  68    { ON,  "GL_EXT_blend_func_separate",       F(EXT_blend_func_separate) },
  69    { ON,  "GL_EXT_blend_logic_op",            F(EXT_blend_logic_op) },
  70    { ON,  "GL_EXT_blend_minmax",              F(EXT_blend_minmax) },
  71    { ON,  "GL_EXT_blend_subtract",            F(EXT_blend_subtract) },
  72    { ON,  "GL_EXT_clip_volume_hint",          F(EXT_clip_volume_hint) },
  73    { OFF, "GL_EXT_cull_vertex",               0 },
  74    { ON,  "GL_EXT_convolution",               F(EXT_convolution) },
  75    { ON,  "GL_EXT_compiled_vertex_array",     F(EXT_compiled_vertex_array) },
  76    { ON,  "GL_EXT_fog_coord",                 F(EXT_fog_coord) },
  77    { ON,  "GL_EXT_histogram",                 F(EXT_histogram) },
  78    { ON,  "GL_EXT_packed_pixels",             F(EXT_packed_pixels) },
  79    { ON,  "GL_EXT_paletted_texture",          F(EXT_paletted_texture) },
  80    { ON,  "GL_EXT_point_parameters",          F(EXT_point_parameters) },
  81    { ON,  "GL_EXT_polygon_offset",            F(EXT_polygon_offset) },
  82    { ON,  "GL_EXT_rescale_normal",            F(EXT_rescale_normal) },
  83    { ON,  "GL_EXT_secondary_color",           F(EXT_secondary_color) },
  84    { ON,  "GL_EXT_shared_texture_palette",    F(EXT_shared_texture_palette) },
  85    { ON,  "GL_EXT_stencil_wrap",              F(EXT_stencil_wrap) },
  86    { ON,  "GL_EXT_texture3D",                 F(EXT_texture3D) },
  87    { OFF, "GL_EXT_texture_compression_s3tc",  F(EXT_texture_compression_s3tc) },
  88    { ON,  "GL_EXT_texture_env_add",           F(EXT_texture_env_add) },
  89    { OFF, "GL_EXT_texture_env_combine",       F(EXT_texture_env_combine) },
  90    { ON,  "GL_EXT_texture_object",            F(EXT_texture_object) },
  91    { ON,  "GL_EXT_texture_lod_bias",          F(EXT_texture_lod_bias) },
  92    { ON,  "GL_EXT_vertex_array",              0 },
  93    { OFF, "GL_EXT_vertex_array_set",          F(EXT_vertex_array_set) },
  94    { OFF, "GL_HP_occlusion_test",             F(HP_occlusion_test) },
  95    { ON,  "GL_INGR_blend_func_separate",      F(INGR_blend_func_separate) },
  96    { ON,  "GL_MESA_window_pos",               F(MESA_window_pos) },
  97    { ON,  "GL_MESA_resize_buffers",           F(MESA_resize_buffers) },
  98    { OFF, "GL_NV_blend_square",               F(NV_blend_square) },
  99    { ON,  "GL_NV_texgen_reflection",          F(NV_texgen_reflection) },
 100    { ON,  "GL_PGI_misc_hints",                F(PGI_misc_hints) },
 101    { ON,  "GL_SGI_color_matrix",              F(SGI_color_matrix) },
 102    { ON,  "GL_SGI_color_table",               F(SGI_color_table) },
 103    { ON,  "GL_SGIS_pixel_texture",            F(SGIS_pixel_texture) },
 104    { ON,  "GL_SGIS_texture_edge_clamp",       F(SGIS_texture_edge_clamp) },
 105    { ON,  "GL_SGIX_pixel_texture",            F(SGIX_pixel_texture) },
 106    { OFF, "GL_3DFX_texture_compression_FXT1", F(_3DFX_texture_compression_FXT1) }
 107 };
 108
 109
 110
 111
 112
 113 int gl_extensions_add( GLcontext *ctx,
 114                        GLboolean enabled,
 115                        const char *name,
 116                        GLboolean *flag_ptr )
 117 {
 118    if (ctx->Extensions.ext_string == 0) {
 119       struct extension *t = MALLOC_STRUCT(extension);
 120       t->enabled = enabled;
 121       strncpy(t->name, name, MAX_EXT_NAMELEN);
 122       t->name[MAX_EXT_NAMELEN] = 0;
 123       t->flag = flag_ptr;
 124       if (t->flag)
 125          *t->flag = enabled;
 126       insert_at_tail( ctx->Extensions.ext_list, t );
 127       return 0;
 128    }
 129    return 1;
 130 }
 131
 132
 133 /*
 134  * Either enable or disable the named extension.
 135  */
 136 static int set_extension( GLcontext *ctx, const char *name, GLint state )
 137 {
 138    struct extension *i;
 139    foreach( i, ctx->Extensions.ext_list )
 140       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
 141          break;
 142
 143    if (i == ctx->Extensions.ext_list)
 144       return 1;
 145
 146    if (i->flag)
 147       *(i->flag) = state;
 148    i->enabled = state;
 149    return 0;
 150 }
 151
 152
 153 int gl_extensions_enable( GLcontext *ctx, const char *name )
 154 {
 155    if (ctx->Extensions.ext_string == 0)
 156       return set_extension( ctx, name, 1 );
 157    return 1;
 158 }
 159
 160
 161 int gl_extensions_disable( GLcontext *ctx, const char *name )
 162 {
 163    if (ctx->Extensions.ext_string == 0)
 164       return set_extension( ctx, name, 0 );
 165    return 1;
 166 }
 167
 168
 169 /*
 170  * Test if the named extension is enabled in this context.
 171  */
 172 GLboolean gl_extension_is_enabled( GLcontext *ctx, const char *name)
 173 {
 174    struct extension *i;
 175    foreach( i, ctx->Extensions.ext_list )
 176       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) {
 177          if (i->enabled)
 178             return GL_TRUE;
 179          else
 180             return GL_FALSE;
 181       }
 182
 183    return GL_FALSE;
 184 }
 185
 186
 187 void gl_extensions_dtr( GLcontext *ctx )
 188 {
 189    struct extension *i, *nexti;
 190
 191    if (ctx->Extensions.ext_string) {
 192       FREE( ctx->Extensions.ext_string );
 193       ctx->Extensions.ext_string = 0;
 194    }
 195
 196    if (ctx->Extensions.ext_list) {
 197       foreach_s( i, nexti, ctx->Extensions.ext_list ) {
 198          remove_from_list( i );
 199          FREE( i );
 200       }
 201
 202       FREE(ctx->Extensions.ext_list);
 203       ctx->Extensions.ext_list = 0;
 204    }
 205 }
 206
 207
 208 void gl_extensions_ctr( GLcontext *ctx )
 209 {
 210    GLuint i;
 211    GLboolean *base = (GLboolean *)&ctx->Extensions;
 212
 213    ctx->Extensions.ext_string = 0;
 214    ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
 215    make_empty_list( ctx->Extensions.ext_list );
 216
 217    for (i = 0 ; i < Elements(default_extensions) ; i++) {
 218       GLboolean *ptr = 0;
 219
 220       if (default_extensions[i].flag_offset)
 221          ptr = base + default_extensions[i].flag_offset;
 222
 223       gl_extensions_add( ctx,
 224                          default_extensions[i].enabled,
 225                          default_extensions[i].name,
 226                          ptr);
 227    }
 228 }
 229
 230
 231 const char *gl_extensions_get_string( GLcontext *ctx )
 232 {
 233    if (ctx->Extensions.ext_string == 0)
 234    {
 235       struct extension *i;
 236       char *str;
 237       GLuint len = 0;
 238       foreach (i, ctx->Extensions.ext_list)
 239          if (i->enabled)
 240             len += strlen(i->name) + 1;
 241
 242       if (len == 0)
 243          return "";
 244
 245       str = (char *)MALLOC(len * sizeof(char));
 246       ctx->Extensions.ext_string = str;
 247
 248       foreach (i, ctx->Extensions.ext_list)
 249          if (i->enabled) {
 250             strcpy(str, i->name);
 251             str += strlen(str);
 252             *str++ = ' ';
 253          }
 254
 255       *(str-1) = 0;
 256    }
 257
 258    return ctx->Extensions.ext_string;
 259 }