src/glx/glxextensions.c

   1 /*
   2  * (C) Copyright IBM Corporation 2002, 2004
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDERS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file glxextensions.c
  27  *
  28  * \author Ian Romanick <idr@us.ibm.com>
  29  */
  30
  31 #include "glxclient.h"
  32 #include <X11/extensions/extutil.h>
  33 #include <X11/extensions/Xext.h>
  34 #include <string.h>
  35 #include "glxextensions.h"
  36
  37
  38 #define SET_BIT(m,b)   (m[ (b) / 8 ] |=  (1U << ((b) % 8)))
  39 #define CLR_BIT(m,b)   (m[ (b) / 8 ] &= ~(1U << ((b) % 8)))
  40 #define IS_SET(m,b)    ((m[ (b) / 8 ] & (1U << ((b) % 8))) != 0)
  41 #define CONCAT(a,b) a ## b
  42 #define GLX(n) "GLX_" # n, 4 + sizeof( # n ) - 1, CONCAT(n,_bit)
  43 #define GL(n)  "GL_" # n,  3 + sizeof( # n ) - 1, GL_ ## n ## _bit
  44 #define VER(a,b)  a, b
  45 #define Y  1
  46 #define N  0
  47 #define EXT_ENABLED(bit,supported) (IS_SET( supported, bit ))
  48
  49
  50 struct extension_info
  51 {
  52    const char *const name;
  53    unsigned name_len;
  54
  55    unsigned char bit;
  56
  57    /* This is the lowest version of GLX that "requires" this extension.
  58     * For example, GLX 1.3 requires SGIX_fbconfig, SGIX_pbuffer, and
  59     * SGI_make_current_read.  If the extension is not required by any known
  60     * version of GLX, use 0, 0.
  61     */
  62    unsigned char version_major;
  63    unsigned char version_minor;
  64    unsigned char client_support;
  65    unsigned char direct_support;
  66    unsigned char client_only;        /** Is the extension client-side only? */
  67    unsigned char direct_only;        /** Is the extension for direct
  68                                       * contexts only?
  69                                       */
  70 };
  71
  72 /* *INDENT-OFF* */
  73 static const struct extension_info known_glx_extensions[] = {
  74    { GLX(ARB_get_proc_address),        VER(1,4), Y, N, Y, N },
  75    { GLX(ARB_multisample),             VER(1,4), Y, Y, N, N },
  76    { GLX(ARB_render_texture),          VER(0,0), N, N, N, N },
  77    { GLX(ATI_pixel_format_float),      VER(0,0), N, N, N, N },
  78 #ifdef GLX_USE_APPLEGL
  79    { GLX(EXT_import_context),          VER(0,0), N, N, N, N },
  80    { GLX(EXT_visual_info),             VER(0,0), N, N, N, N },
  81 #else
  82    { GLX(EXT_import_context),          VER(0,0), Y, Y, N, N },
  83    { GLX(EXT_visual_info),             VER(0,0), Y, Y, N, N },
  84 #endif
  85    { GLX(EXT_visual_rating),           VER(0,0), Y, Y, N, N },
  86 #ifdef GLX_USE_APPLEGL
  87    { GLX(MESA_agp_offset),             VER(0,0), N, N, N, N }, /* Deprecated */
  88    { GLX(MESA_copy_sub_buffer),        VER(0,0), N, N, N, N },
  89 #else
  90    { GLX(MESA_agp_offset),             VER(0,0), N, N, N, Y }, /* Deprecated */
  91    { GLX(MESA_copy_sub_buffer),        VER(0,0), Y, N, N, N },
  92 #endif
  93    { GLX(MESA_pixmap_colormap),        VER(0,0), N, N, N, N }, /* Deprecated */
  94    { GLX(MESA_release_buffers),        VER(0,0), N, N, N, N }, /* Deprecated */
  95 #ifdef GLX_USE_APPLEGL
  96    { GLX(MESA_swap_control),           VER(0,0), N, N, N, N },
  97 #else
  98    { GLX(MESA_swap_control),           VER(0,0), Y, N, N, Y },
  99 #endif
 100    { GLX(NV_float_buffer),             VER(0,0), N, N, N, N },
 101    { GLX(NV_render_depth_texture),     VER(0,0), N, N, N, N },
 102    { GLX(NV_render_texture_rectangle), VER(0,0), N, N, N, N },
 103 #ifdef GLX_USE_APPLEGL
 104    { GLX(NV_vertex_array_range),       VER(0,0), N, N, N, N }, /* Deprecated */
 105    { GLX(OML_swap_method),             VER(0,0), N, N, N, N },
 106    { GLX(OML_sync_control),            VER(0,0), N, N, N, N },
 107    { GLX(SGI_make_current_read),       VER(1,3), N, N, N, N },
 108    { GLX(SGI_swap_control),            VER(0,0), N, N, N, N },
 109    { GLX(SGI_video_sync),              VER(0,0), N, N, N, N },
 110 #else
 111    { GLX(NV_vertex_array_range),       VER(0,0), N, N, N, Y }, /* Deprecated */
 112    { GLX(OML_swap_method),             VER(0,0), Y, Y, N, N },
 113    { GLX(OML_sync_control),            VER(0,0), Y, N, N, Y },
 114    { GLX(SGI_make_current_read),       VER(1,3), Y, N, N, N },
 115    { GLX(SGI_swap_control),            VER(0,0), Y, N, N, N },
 116    { GLX(SGI_video_sync),              VER(0,0), Y, N, N, Y },
 117 #endif
 118    { GLX(SGIS_blended_overlay),        VER(0,0), N, N, N, N },
 119    { GLX(SGIS_color_range),            VER(0,0), N, N, N, N },
 120 #ifdef GLX_USE_APPLEGL
 121    { GLX(SGIS_multisample),            VER(0,0), N, N, N, N },
 122 #else
 123    { GLX(SGIS_multisample),            VER(0,0), Y, Y, N, N },
 124 #endif
 125    { GLX(SGIX_fbconfig),               VER(1,3), Y, Y, N, N },
 126 #ifdef GLX_USE_APPLEGL
 127    { GLX(SGIX_pbuffer),                VER(1,3), N, N, N, N },
 128 #else
 129    { GLX(SGIX_pbuffer),                VER(1,3), Y, Y, N, N },
 130 #endif
 131    { GLX(SGIX_swap_barrier),           VER(0,0), N, N, N, N },
 132    { GLX(SGIX_swap_group),             VER(0,0), N, N, N, N },
 133 #ifdef GLX_USE_APPLEGL
 134    { GLX(SGIX_visual_select_group),    VER(0,0), N, N, N, N },
 135    { GLX(EXT_texture_from_pixmap),     VER(0,0), N, N, N, N },
 136 #else
 137    { GLX(SGIX_visual_select_group),    VER(0,0), Y, Y, N, N },
 138    { GLX(EXT_texture_from_pixmap),     VER(0,0), Y, N, N, N },
 139 #endif
 140    { GLX(INTEL_swap_event),            VER(1,4), Y, Y, N, N },
 141    { NULL }
 142 };
 143
 144 static const struct extension_info known_gl_extensions[] = {
 145    { GL(ARB_depth_texture),              VER(1,4), Y, N, N, N },
 146    { GL(ARB_draw_buffers),               VER(0,0), Y, N, N, N },
 147    { GL(ARB_fragment_program),           VER(0,0), Y, N, N, N },
 148    { GL(ARB_fragment_program_shadow),    VER(0,0), Y, N, N, N },
 149    { GL(ARB_framebuffer_object),         VER(0,0), Y, N, N, N },
 150    { GL(ARB_imaging),                    VER(0,0), Y, N, N, N },
 151    { GL(ARB_multisample),                VER(1,3), Y, N, N, N },
 152    { GL(ARB_multitexture),               VER(1,3), Y, N, N, N },
 153    { GL(ARB_occlusion_query),            VER(1,5), Y, N, N, N },
 154    { GL(ARB_point_parameters),           VER(1,4), Y, N, N, N },
 155    { GL(ARB_point_sprite),               VER(0,0), Y, N, N, N },
 156    { GL(ARB_shadow),                     VER(1,4), Y, N, N, N },
 157    { GL(ARB_shadow_ambient),             VER(0,0), Y, N, N, N },
 158    { GL(ARB_texture_border_clamp),       VER(1,3), Y, N, N, N },
 159    { GL(ARB_texture_compression),        VER(1,3), Y, N, N, N },
 160    { GL(ARB_texture_cube_map),           VER(1,3), Y, N, N, N },
 161    { GL(ARB_texture_env_add),            VER(1,3), Y, N, N, N },
 162    { GL(ARB_texture_env_combine),        VER(1,3), Y, N, N, N },
 163    { GL(ARB_texture_env_crossbar),       VER(1,4), Y, N, N, N },
 164    { GL(ARB_texture_env_dot3),           VER(1,3), Y, N, N, N },
 165    { GL(ARB_texture_mirrored_repeat),    VER(1,4), Y, N, N, N },
 166    { GL(ARB_texture_non_power_of_two),   VER(1,5), Y, N, N, N },
 167    { GL(ARB_texture_rectangle),          VER(0,0), Y, N, N, N },
 168    { GL(ARB_texture_rg),                 VER(0,0), Y, N, N, N },
 169    { GL(ARB_transpose_matrix),           VER(1,3), Y, N, Y, N },
 170    { GL(ARB_vertex_buffer_object),       VER(1,5), N, N, N, N },
 171    { GL(ARB_vertex_program),             VER(0,0), Y, N, N, N },
 172    { GL(ARB_window_pos),                 VER(1,4), Y, N, N, N },
 173    { GL(EXT_abgr),                       VER(0,0), Y, N, N, N },
 174    { GL(EXT_bgra),                       VER(1,2), Y, N, N, N },
 175    { GL(EXT_blend_color),                VER(1,4), Y, N, N, N },
 176    { GL(EXT_blend_equation_separate),    VER(0,0), Y, N, N, N },
 177    { GL(EXT_blend_func_separate),        VER(1,4), Y, N, N, N },
 178    { GL(EXT_blend_logic_op),             VER(1,4), Y, N, N, N },
 179    { GL(EXT_blend_minmax),               VER(1,4), Y, N, N, N },
 180    { GL(EXT_blend_subtract),             VER(1,4), Y, N, N, N },
 181    { GL(EXT_clip_volume_hint),           VER(0,0), Y, N, N, N },
 182    { GL(EXT_compiled_vertex_array),      VER(0,0), N, N, N, N },
 183    { GL(EXT_convolution),                VER(0,0), N, N, N, N },
 184    { GL(EXT_copy_texture),               VER(1,1), Y, N, N, N },
 185    { GL(EXT_cull_vertex),                VER(0,0), N, N, N, N },
 186    { GL(EXT_depth_bounds_test),          VER(0,0), N, N, N, N },
 187    { GL(EXT_draw_range_elements),        VER(1,2), Y, N, Y, N },
 188    { GL(EXT_fog_coord),                  VER(1,4), Y, N, N, N },
 189    { GL(EXT_framebuffer_blit),           VER(0,0), Y, N, N, N },
 190    { GL(EXT_framebuffer_multisample),    VER(0,0), Y, N, N, N },
 191    { GL(EXT_framebuffer_object),         VER(0,0), Y, N, N, N },
 192    { GL(EXT_multi_draw_arrays),          VER(1,4), Y, N, Y, N },
 193    { GL(EXT_packed_depth_stencil),       VER(0,0), Y, N, N, N },
 194    { GL(EXT_packed_pixels),              VER(1,2), Y, N, N, N },
 195    { GL(EXT_paletted_texture),           VER(0,0), Y, N, N, N },
 196    { GL(EXT_pixel_buffer_object),        VER(0,0), N, N, N, N },
 197    { GL(EXT_point_parameters),           VER(1,4), Y, N, N, N },
 198    { GL(EXT_polygon_offset),             VER(1,1), Y, N, N, N },
 199    { GL(EXT_rescale_normal),             VER(1,2), Y, N, N, N },
 200    { GL(EXT_secondary_color),            VER(1,4), Y, N, N, N },
 201    { GL(EXT_separate_specular_color),    VER(1,2), Y, N, N, N },
 202    { GL(EXT_shadow_funcs),               VER(1,5), Y, N, N, N },
 203    { GL(EXT_shared_texture_palette),     VER(0,0), Y, N, N, N },
 204    { GL(EXT_stencil_two_side),           VER(0,0), Y, N, N, N },
 205    { GL(EXT_stencil_wrap),               VER(1,4), Y, N, N, N },
 206    { GL(EXT_subtexture),                 VER(1,1), Y, N, N, N },
 207    { GL(EXT_texture),                    VER(1,1), Y, N, N, N },
 208    { GL(EXT_texture3D),                  VER(1,2), Y, N, N, N },
 209    { GL(EXT_texture_compression_dxt1),   VER(0,0), Y, N, N, N },
 210    { GL(EXT_texture_compression_s3tc),   VER(0,0), Y, N, N, N },
 211    { GL(EXT_texture_edge_clamp),         VER(1,2), Y, N, N, N },
 212    { GL(EXT_texture_env_add),            VER(1,3), Y, N, N, N },
 213    { GL(EXT_texture_env_combine),        VER(1,3), Y, N, N, N },
 214    { GL(EXT_texture_env_dot3),           VER(0,0), Y, N, N, N },
 215    { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
 216    { GL(EXT_texture_lod),                VER(1,2), Y, N, N, N },
 217    { GL(EXT_texture_lod_bias),           VER(1,4), Y, N, N, N },
 218    { GL(EXT_texture_mirror_clamp),       VER(0,0), Y, N, N, N },
 219    { GL(EXT_texture_object),             VER(1,1), Y, N, N, N },
 220    { GL(EXT_texture_rectangle),          VER(0,0), Y, N, N, N },
 221    { GL(EXT_vertex_array),               VER(0,0), Y, N, N, N },
 222    { GL(3DFX_texture_compression_FXT1),  VER(0,0), Y, N, N, N },
 223    { GL(APPLE_packed_pixels),            VER(1,2), Y, N, N, N },
 224    { GL(APPLE_ycbcr_422),                VER(0,0), Y, N, N, N },
 225    { GL(ATI_draw_buffers),               VER(0,0), Y, N, N, N },
 226    { GL(ATI_text_fragment_shader),       VER(0,0), Y, N, N, N },
 227    { GL(ATI_texture_env_combine3),       VER(0,0), Y, N, N, N },
 228    { GL(ATI_texture_float),              VER(0,0), Y, N, N, N },
 229    { GL(ATI_texture_mirror_once),        VER(0,0), Y, N, N, N },
 230    { GL(ATIX_texture_env_combine3),      VER(0,0), Y, N, N, N },
 231    { GL(HP_convolution_border_modes),    VER(0,0), Y, N, N, N },
 232    { GL(HP_occlusion_test),              VER(0,0), Y, N, N, N },
 233    { GL(IBM_cull_vertex),                VER(0,0), Y, N, N, N },
 234    { GL(IBM_pixel_filter_hint),          VER(0,0), Y, N, N, N },
 235    { GL(IBM_rasterpos_clip),             VER(0,0), Y, N, N, N },
 236    { GL(IBM_texture_clamp_nodraw),       VER(0,0), Y, N, N, N },
 237    { GL(IBM_texture_mirrored_repeat),    VER(0,0), Y, N, N, N },
 238    { GL(INGR_blend_func_separate),       VER(0,0), Y, N, N, N },
 239    { GL(INGR_interlace_read),            VER(0,0), Y, N, N, N },
 240    { GL(MESA_pack_invert),               VER(0,0), Y, N, N, N },
 241    { GL(MESA_ycbcr_texture),             VER(0,0), Y, N, N, N },
 242    { GL(NV_blend_square),                VER(1,4), Y, N, N, N },
 243    { GL(NV_copy_depth_to_color),         VER(0,0), Y, N, N, N },
 244    { GL(NV_depth_clamp),                 VER(0,0), Y, N, N, N },
 245    { GL(NV_fog_distance),                VER(0,0), Y, N, N, N },
 246    { GL(NV_fragment_program),            VER(0,0), Y, N, N, N },
 247    { GL(NV_fragment_program_option),     VER(0,0), Y, N, N, N },
 248    { GL(NV_fragment_program2),           VER(0,0), Y, N, N, N },
 249    { GL(NV_light_max_exponent),          VER(0,0), Y, N, N, N },
 250    { GL(NV_multisample_filter_hint),     VER(0,0), Y, N, N, N },
 251    { GL(NV_packed_depth_stencil),        VER(0,0), Y, N, N, N },
 252    { GL(NV_point_sprite),                VER(0,0), Y, N, N, N },
 253    { GL(NV_texgen_reflection),           VER(0,0), Y, N, N, N },
 254    { GL(NV_texture_compression_vtc),     VER(0,0), Y, N, N, N },
 255    { GL(NV_texture_env_combine4),        VER(0,0), Y, N, N, N },
 256    { GL(NV_texture_rectangle),           VER(0,0), Y, N, N, N },
 257    { GL(NV_vertex_program),              VER(0,0), Y, N, N, N },
 258    { GL(NV_vertex_program1_1),           VER(0,0), Y, N, N, N },
 259    { GL(NV_vertex_program2),             VER(0,0), Y, N, N, N },
 260    { GL(NV_vertex_program2_option),      VER(0,0), Y, N, N, N },
 261    { GL(NV_vertex_program3),             VER(0,0), Y, N, N, N },
 262    { GL(OES_read_format),                VER(0,0), Y, N, N, N },
 263    { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
 264    { GL(SGI_color_matrix),               VER(0,0), Y, N, N, N },
 265    { GL(SGI_color_table),                VER(0,0), Y, N, N, N },
 266    { GL(SGI_texture_color_table),        VER(0,0), Y, N, N, N },
 267    { GL(SGIS_generate_mipmap),           VER(1,4), Y, N, N, N },
 268    { GL(SGIS_multisample),               VER(0,0), Y, N, N, N },
 269    { GL(SGIS_texture_border_clamp),      VER(1,3), Y, N, N, N },
 270    { GL(SGIS_texture_edge_clamp),        VER(1,2), Y, N, N, N },
 271    { GL(SGIS_texture_lod),               VER(1,2), Y, N, N, N },
 272    { GL(SGIX_blend_alpha_minmax),        VER(0,0), Y, N, N, N },
 273    { GL(SGIX_clipmap),                   VER(0,0), Y, N, N, N },
 274    { GL(SGIX_depth_texture),             VER(0,0), Y, N, N, N },
 275    { GL(SGIX_fog_offset),                VER(0,0), Y, N, N, N },
 276    { GL(SGIX_shadow),                    VER(0,0), Y, N, N, N },
 277    { GL(SGIX_shadow_ambient),            VER(0,0), Y, N, N, N },
 278    { GL(SGIX_texture_coordinate_clamp),  VER(0,0), Y, N, N, N },
 279    { GL(SGIX_texture_lod_bias),          VER(0,0), Y, N, N, N },
 280    { GL(SGIX_texture_range),             VER(0,0), Y, N, N, N },
 281    { GL(SGIX_texture_scale_bias),        VER(0,0), Y, N, N, N },
 282    { GL(SGIX_vertex_preclip),            VER(0,0), Y, N, N, N },
 283    { GL(SGIX_vertex_preclip_hint),       VER(0,0), Y, N, N, N },
 284    { GL(SGIX_ycrcb),                     VER(0,0), Y, N, N, N },
 285    { GL(SUN_convolution_border_modes),   VER(0,0), Y, N, N, N },
 286    { GL(SUN_multi_draw_arrays),          VER(0,0), Y, N, Y, N },
 287    { GL(SUN_slice_accum),                VER(0,0), Y, N, N, N },
 288    { NULL }
 289 };
 290 /* *INDENT-ON* */
 291
 292
 293 /* global bit-fields of available extensions and their characteristics */
 294 static unsigned char client_glx_support[8];
 295 static unsigned char client_glx_only[8];
 296 static unsigned char direct_glx_only[8];
 297 static unsigned char client_gl_support[__GL_EXT_BYTES];
 298 static unsigned char client_gl_only[__GL_EXT_BYTES];
 299
 300 /**
 301  * Bits representing the set of extensions that are enabled by default in all
 302  * direct rendering drivers.
 303  */
 304 static unsigned char direct_glx_support[8];
 305
 306 /**
 307  * Highest core GL version that can be supported for indirect rendering.
 308  */
 309 static const unsigned gl_major = 1;
 310 static const unsigned gl_minor = 4;
 311
 312 /* client extensions string */
 313 static const char *__glXGLXClientExtensions = NULL;
 314
 315 static void __glXExtensionsCtr(void);
 316 static void __glXExtensionsCtrScreen(struct glx_screen * psc);
 317 static void __glXProcessServerString(const struct extension_info *ext,
 318                                      const char *server_string,
 319                                      unsigned char *server_support);
 320
 321 /**
 322  * Set the state of a GLX extension.
 323  *
 324  * \param name      Name of the extension.
 325  * \param name_len  Length, in characters, of the extension name.
 326  * \param state     New state (either enabled or disabled) of the extension.
 327  * \param supported Table in which the state of the extension is to be set.
 328  */
 329 static void
 330 set_glx_extension(const struct extension_info *ext,
 331                   const char *name, unsigned name_len, GLboolean state,
 332                   unsigned char *supported)
 333 {
 334    unsigned i;
 335
 336
 337    for (i = 0; ext[i].name != NULL; i++) {
 338       if ((name_len == ext[i].name_len)
 339           && (strncmp(ext[i].name, name, name_len) == 0)) {
 340          if (state) {
 341             SET_BIT(supported, ext[i].bit);
 342          }
 343          else {
 344             CLR_BIT(supported, ext[i].bit);
 345          }
 346
 347          return;
 348       }
 349    }
 350 }
 351
 352
 353 #define NUL '\0'
 354 #define SEPARATOR ' '
 355
 356 /**
 357  * Convert the server's extension string to a bit-field.
 358  *
 359  * \param server_string   GLX extension string from the server.
 360  * \param server_support  Bit-field of supported extensions.
 361  *
 362  * \note
 363  * This function is used to process both GLX and GL extension strings.  The
 364  * bit-fields used to track each of these have different sizes.  Therefore,
 365  * the data pointed by \c server_support must be preinitialized to zero.
 366  */
 367 static void
 368 __glXProcessServerString(const struct extension_info *ext,
 369                          const char *server_string,
 370                          unsigned char *server_support)
 371 {
 372    unsigned base;
 373    unsigned len;
 374
 375    for (base = 0; server_string[base] != NUL; /* empty */ ) {
 376       /* Determine the length of the next extension name.
 377        */
 378       for (len = 0; (server_string[base + len] != SEPARATOR)
 379            && (server_string[base + len] != NUL); len++) {
 380          /* empty */
 381       }
 382
 383       /* Set the bit for the extension in the server_support table.
 384        */
 385       set_glx_extension(ext, &server_string[base], len, GL_TRUE,
 386                         server_support);
 387
 388
 389       /* Advance to the next extension string.  This means that we skip
 390        * over the previous string and any trialing white-space.
 391        */
 392       for (base += len; (server_string[base] == SEPARATOR)
 393            && (server_string[base] != NUL); base++) {
 394          /* empty */
 395       }
 396    }
 397 }
 398
 399 void
 400 __glXEnableDirectExtension(struct glx_screen * psc, const char *name)
 401 {
 402    __glXExtensionsCtr();
 403    __glXExtensionsCtrScreen(psc);
 404
 405    set_glx_extension(known_glx_extensions,
 406                      name, strlen(name), GL_TRUE, psc->direct_support);
 407 }
 408
 409 /**
 410  * Initialize global extension support tables.
 411  */
 412
 413 static void
 414 __glXExtensionsCtr(void)
 415 {
 416    unsigned i;
 417    static GLboolean ext_list_first_time = GL_TRUE;
 418
 419
 420    if (ext_list_first_time) {
 421       ext_list_first_time = GL_FALSE;
 422
 423       (void) memset(client_glx_support, 0, sizeof(client_glx_support));
 424       (void) memset(direct_glx_support, 0, sizeof(direct_glx_support));
 425       (void) memset(client_glx_only, 0, sizeof(client_glx_only));
 426       (void) memset(direct_glx_only, 0, sizeof(direct_glx_only));
 427
 428       (void) memset(client_gl_support, 0, sizeof(client_gl_support));
 429       (void) memset(client_gl_only, 0, sizeof(client_gl_only));
 430
 431       for (i = 0; known_glx_extensions[i].name != NULL; i++) {
 432          const unsigned bit = known_glx_extensions[i].bit;
 433
 434          if (known_glx_extensions[i].client_support) {
 435             SET_BIT(client_glx_support, bit);
 436          }
 437
 438          if (known_glx_extensions[i].direct_support) {
 439             SET_BIT(direct_glx_support, bit);
 440          }
 441
 442          if (known_glx_extensions[i].client_only) {
 443             SET_BIT(client_glx_only, bit);
 444          }
 445
 446          if (known_glx_extensions[i].direct_only) {
 447             SET_BIT(direct_glx_only, bit);
 448          }
 449       }
 450
 451       for (i = 0; known_gl_extensions[i].name != NULL; i++) {
 452          const unsigned bit = known_gl_extensions[i].bit;
 453
 454          if (known_gl_extensions[i].client_support) {
 455             SET_BIT(client_gl_support, bit);
 456          }
 457
 458          if (known_gl_extensions[i].client_only) {
 459             SET_BIT(client_gl_only, bit);
 460          }
 461       }
 462
 463 #if 0
 464       fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n",
 465               __func__, __LINE__, gl_major, gl_minor);
 466 #endif
 467    }
 468 }
 469
 470
 471 /**
 472  * Make sure that per-screen direct-support table is initialized.
 473  *
 474  * \param psc  Pointer to GLX per-screen record.
 475  */
 476
 477 static void
 478 __glXExtensionsCtrScreen(struct glx_screen * psc)
 479 {
 480    if (psc->ext_list_first_time) {
 481       psc->ext_list_first_time = GL_FALSE;
 482       (void) memcpy(psc->direct_support, direct_glx_support,
 483                     sizeof(direct_glx_support));
 484    }
 485 }
 486
 487
 488 /**
 489  * Check if a certain extension is enabled on a given screen.
 490  *
 491  * \param psc  Pointer to GLX per-screen record.
 492  * \param bit  Bit index in the direct-support table.
 493  * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
 494  *          returned.  If the extension bit is not enabled or if \c psc is
 495  *          \c NULL, then \c GL_FALSE is returned.
 496  */
 497 GLboolean
 498 __glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit)
 499 {
 500    GLboolean enabled = GL_FALSE;
 501
 502    if (psc != NULL) {
 503       __glXExtensionsCtr();
 504       __glXExtensionsCtrScreen(psc);
 505       enabled = EXT_ENABLED(bit, psc->direct_support);
 506    }
 507
 508    return enabled;
 509 }
 510
 511
 512 /**
 513  * Check if a certain extension is enabled in a given context.
 514  *
 515  */
 516 GLboolean
 517 __glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit)
 518 {
 519    GLboolean enabled = GL_FALSE;
 520
 521    if (gc != NULL) {
 522       enabled = EXT_ENABLED(bit, gc->gl_extension_bits);
 523    }
 524
 525    return enabled;
 526 }
 527
 528
 529
 530 /**
 531  * Convert a bit-field to a string of supported extensions.
 532  */
 533 static char *
 534 __glXGetStringFromTable(const struct extension_info *ext,
 535                         const unsigned char *supported)
 536 {
 537    unsigned i;
 538    unsigned ext_str_len;
 539    char *ext_str;
 540    char *point;
 541
 542
 543    ext_str_len = 0;
 544    for (i = 0; ext[i].name != NULL; i++) {
 545       if (EXT_ENABLED(ext[i].bit, supported)) {
 546          ext_str_len += ext[i].name_len + 1;
 547       }
 548    }
 549
 550    ext_str = Xmalloc(ext_str_len + 1);
 551    if (ext_str != NULL) {
 552       point = ext_str;
 553
 554       for (i = 0; ext[i].name != NULL; i++) {
 555          if (EXT_ENABLED(ext[i].bit, supported)) {
 556             (void) memcpy(point, ext[i].name, ext[i].name_len);
 557             point += ext[i].name_len;
 558
 559             *point = ' ';
 560             point++;
 561          }
 562       }
 563
 564       *point = '\0';
 565    }
 566
 567    return ext_str;
 568 }
 569
 570
 571 /**
 572  * Get the string of client library supported extensions.
 573  */
 574 const char *
 575 __glXGetClientExtensions(void)
 576 {
 577    if (__glXGLXClientExtensions == NULL) {
 578       __glXExtensionsCtr();
 579       __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
 580                                                          client_glx_support);
 581    }
 582
 583    return __glXGLXClientExtensions;
 584 }
 585
 586
 587 /**
 588  * Calculate the list of application usable extensions.  The resulting
 589  * string is stored in \c psc->effectiveGLXexts.
 590  *
 591  * \param psc                        Pointer to GLX per-screen record.
 592  * \param display_is_direct_capable  True if the display is capable of
 593  *                                   direct rendering.
 594  * \param minor_version              GLX minor version from the server.
 595  */
 596
 597 void
 598 __glXCalculateUsableExtensions(struct glx_screen * psc,
 599                                GLboolean display_is_direct_capable,
 600                                int minor_version)
 601 {
 602    unsigned char server_support[8];
 603    unsigned char usable[8];
 604    unsigned i;
 605
 606    __glXExtensionsCtr();
 607    __glXExtensionsCtrScreen(psc);
 608
 609    (void) memset(server_support, 0, sizeof(server_support));
 610    __glXProcessServerString(known_glx_extensions,
 611                             psc->serverGLXexts, server_support);
 612
 613
 614    /* This is a hack.  Some servers support GLX 1.3 but don't export
 615     * all of the extensions implied by GLX 1.3.  If the server claims
 616     * support for GLX 1.3, enable support for the extensions that can be
 617     * "emulated" as well.
 618     */
 619
 620    if (minor_version >= 3) {
 621       SET_BIT(server_support, EXT_visual_info_bit);
 622       SET_BIT(server_support, EXT_visual_rating_bit);
 623       SET_BIT(server_support, SGI_make_current_read_bit);
 624       SET_BIT(server_support, SGIX_fbconfig_bit);
 625       SET_BIT(server_support, SGIX_pbuffer_bit);
 626
 627       /* This one is a little iffy.  GLX 1.3 doesn't incorporate all of this
 628        * extension.  However, the only part that is not strictly client-side
 629        * is shared.  That's the glXQueryContext / glXQueryContextInfoEXT
 630        * function.
 631        */
 632
 633       SET_BIT(server_support, EXT_import_context_bit);
 634    }
 635
 636
 637    /* An extension is supported if the client-side (i.e., libGL) supports
 638     * it and the "server" supports it.  In this case that means that either
 639     * the true server supports it or it is only for direct-rendering and
 640     * the direct rendering driver supports it.
 641     *
 642     * If the display is not capable of direct rendering, then the extension
 643     * is enabled if and only if the client-side library and the server
 644     * support it.
 645     */
 646
 647    if (display_is_direct_capable) {
 648       for (i = 0; i < 8; i++) {
 649          usable[i] = (client_glx_support[i] & client_glx_only[i])
 650             | (client_glx_support[i] & psc->direct_support[i] &
 651                server_support[i])
 652             | (client_glx_support[i] & psc->direct_support[i] &
 653                direct_glx_only[i]);
 654       }
 655    }
 656    else {
 657       for (i = 0; i < 8; i++) {
 658          usable[i] = (client_glx_support[i] & client_glx_only[i])
 659             | (client_glx_support[i] & server_support[i]);
 660       }
 661    }
 662
 663    psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions,
 664                                                    usable);
 665 }
 666
 667
 668 /**
 669  * Calculate the list of application usable extensions.  The resulting
 670  * string is stored in \c gc->extensions.
 671  *
 672  * \param gc             Pointer to GLX context.
 673  * \param server_string  Extension string from the server.
 674  * \param major_version  GL major version from the server.
 675  * \param minor_version  GL minor version from the server.
 676  */
 677
 678 void
 679 __glXCalculateUsableGLExtensions(struct glx_context * gc,
 680                                  const char *server_string,
 681                                  int major_version, int minor_version)
 682 {
 683    unsigned char server_support[__GL_EXT_BYTES];
 684    unsigned char usable[__GL_EXT_BYTES];
 685    unsigned i;
 686
 687
 688    __glXExtensionsCtr();
 689
 690    (void) memset(server_support, 0, sizeof(server_support));
 691    __glXProcessServerString(known_gl_extensions, server_string,
 692                             server_support);
 693
 694
 695    /* Handle lazy servers that don't export all the extensions strings that
 696     * are part of the GL core version that they support.
 697     */
 698
 699    for (i = 0; i < __GL_EXT_BYTES; i++) {
 700       if ((known_gl_extensions[i].version_major != 0)
 701           && ((major_version > known_gl_extensions[i].version_major)
 702               || ((major_version == known_gl_extensions[i].version_major)
 703                   && (minor_version >=
 704                       known_gl_extensions[i].version_minor)))) {
 705          SET_BIT(server_support, known_gl_extensions[i].bit);
 706       }
 707    }
 708
 709
 710    /* An extension is supported if the client-side (i.e., libGL) supports
 711     * it and the server supports it or the client-side library supports it
 712     * and it only needs client-side support.
 713     */
 714
 715    for (i = 0; i < __GL_EXT_BYTES; i++) {
 716       usable[i] = (client_gl_support[i] & client_gl_only[i])
 717          | (client_gl_support[i] & server_support[i]);
 718    }
 719
 720    gc->extensions = (unsigned char *)
 721       __glXGetStringFromTable(known_gl_extensions, usable);
 722    (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
 723 }
 724
 725
 726 /**
 727  * Calculates the maximum core GL version that can be supported for indirect
 728  * rendering.
 729  */
 730 void
 731 __glXGetGLVersion(int *major_version, int *minor_version)
 732 {
 733    __glXExtensionsCtr();
 734    *major_version = gl_major;
 735    *minor_version = gl_minor;
 736 }
 737
 738
 739 /**
 740  * Get a string representing the set of extensions supported by the client
 741  * library.  This is currently only used to send the list of extensions
 742  * supported by the client to the server.
 743  */
 744 char *
 745 __glXGetClientGLExtensionString(void)
 746 {
 747    __glXExtensionsCtr();
 748    return __glXGetStringFromTable(known_gl_extensions, client_gl_support);
 749 }