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_create_context),          VER(0,0), Y, N, N, N },
  75    { GLX(ARB_create_context_profile),  VER(0,0), Y, N, N, N },
  76    { GLX(ARB_create_context_robustness), VER(0,0), Y, N, N, N },
  77    { GLX(ARB_framebuffer_sRGB),        VER(0,0), Y, Y, N, N },
  78    { GLX(ARB_get_proc_address),        VER(1,4), Y, N, Y, N },
  79    { GLX(ARB_multisample),             VER(1,4), Y, Y, N, N },
  80    { GLX(ATI_pixel_format_float),      VER(0,0), N, N, N, N },
  81    { GLX(EXT_import_context),          VER(0,0), Y, Y, N, N },
  82    { GLX(EXT_visual_info),             VER(0,0), Y, Y, N, N },
  83    { GLX(EXT_visual_rating),           VER(0,0), Y, Y, N, N },
  84    { GLX(EXT_framebuffer_sRGB),        VER(0,0), Y, Y, N, N },
  85    { GLX(EXT_create_context_es2_profile), VER(0,0), Y, N, N, Y },
  86    { GLX(MESA_copy_sub_buffer),        VER(0,0), Y, N, N, N },
  87    { GLX(MESA_multithread_makecurrent),VER(0,0), Y, N, Y, N },
  88    { GLX(MESA_swap_control),           VER(0,0), Y, N, N, Y },
  89    { GLX(NV_float_buffer),             VER(0,0), N, N, N, N },
  90    { GLX(OML_swap_method),             VER(0,0), Y, Y, N, N },
  91    { GLX(OML_sync_control),            VER(0,0), Y, N, N, Y },
  92    { GLX(SGI_make_current_read),       VER(1,3), Y, N, N, N },
  93    { GLX(SGI_swap_control),            VER(0,0), Y, N, N, N },
  94    { GLX(SGI_video_sync),              VER(0,0), Y, N, N, Y },
  95    { GLX(SGIS_multisample),            VER(0,0), Y, Y, N, N },
  96    { GLX(SGIX_fbconfig),               VER(1,3), Y, Y, N, N },
  97    { GLX(SGIX_pbuffer),                VER(1,3), Y, Y, N, N },
  98    { GLX(SGIX_swap_barrier),           VER(0,0), N, N, N, N },
  99    { GLX(SGIX_swap_group),             VER(0,0), N, N, N, N },
 100    { GLX(SGIX_visual_select_group),    VER(0,0), Y, Y, N, N },
 101    { GLX(EXT_texture_from_pixmap),     VER(0,0), Y, N, N, N },
 102    { GLX(INTEL_swap_event),            VER(0,0), Y, N, N, N },
 103    { NULL }
 104 };
 105
 106 static const struct extension_info known_gl_extensions[] = {
 107    { GL(ARB_depth_texture),              VER(1,4), Y, N, N, N },
 108    { GL(ARB_draw_buffers),               VER(0,0), Y, N, N, N },
 109    { GL(ARB_fragment_program),           VER(0,0), Y, N, N, N },
 110    { GL(ARB_fragment_program_shadow),    VER(0,0), Y, N, N, N },
 111    { GL(ARB_framebuffer_object),         VER(0,0), Y, N, N, N },
 112    { GL(ARB_imaging),                    VER(0,0), Y, N, N, N },
 113    { GL(ARB_multisample),                VER(1,3), Y, N, N, N },
 114    { GL(ARB_multitexture),               VER(1,3), Y, N, N, N },
 115    { GL(ARB_occlusion_query),            VER(1,5), Y, N, N, N },
 116    { GL(ARB_point_parameters),           VER(1,4), Y, N, N, N },
 117    { GL(ARB_point_sprite),               VER(0,0), Y, N, N, N },
 118    { GL(ARB_shadow),                     VER(1,4), Y, N, N, N },
 119    { GL(ARB_shadow_ambient),             VER(0,0), Y, N, N, N },
 120    { GL(ARB_texture_border_clamp),       VER(1,3), Y, N, N, N },
 121    { GL(ARB_texture_compression),        VER(1,3), Y, N, N, N },
 122    { GL(ARB_texture_cube_map),           VER(1,3), Y, N, N, N },
 123    { GL(ARB_texture_env_add),            VER(1,3), Y, N, N, N },
 124    { GL(ARB_texture_env_combine),        VER(1,3), Y, N, N, N },
 125    { GL(ARB_texture_env_crossbar),       VER(1,4), Y, N, N, N },
 126    { GL(ARB_texture_env_dot3),           VER(1,3), Y, N, N, N },
 127    { GL(ARB_texture_mirrored_repeat),    VER(1,4), Y, N, N, N },
 128    { GL(ARB_texture_non_power_of_two),   VER(1,5), Y, N, N, N },
 129    { GL(ARB_texture_rectangle),          VER(0,0), Y, N, N, N },
 130    { GL(ARB_texture_rg),                 VER(0,0), Y, N, N, N },
 131    { GL(ARB_transpose_matrix),           VER(1,3), Y, N, Y, N },
 132    { GL(ARB_vertex_buffer_object),       VER(1,5), N, N, N, N },
 133    { GL(ARB_vertex_program),             VER(0,0), Y, N, N, N },
 134    { GL(ARB_window_pos),                 VER(1,4), Y, N, N, N },
 135    { GL(EXT_abgr),                       VER(0,0), Y, N, N, N },
 136    { GL(EXT_bgra),                       VER(1,2), Y, N, N, N },
 137    { GL(EXT_blend_color),                VER(1,4), Y, N, N, N },
 138    { GL(EXT_blend_equation_separate),    VER(0,0), Y, N, N, N },
 139    { GL(EXT_blend_func_separate),        VER(1,4), Y, N, N, N },
 140    { GL(EXT_blend_logic_op),             VER(1,4), Y, N, N, N },
 141    { GL(EXT_blend_minmax),               VER(1,4), Y, N, N, N },
 142    { GL(EXT_blend_subtract),             VER(1,4), Y, N, N, N },
 143    { GL(EXT_clip_volume_hint),           VER(0,0), Y, N, N, N },
 144    { GL(EXT_compiled_vertex_array),      VER(0,0), N, N, N, N },
 145    { GL(EXT_convolution),                VER(0,0), N, N, N, N },
 146    { GL(EXT_copy_texture),               VER(1,1), Y, N, N, N },
 147    { GL(EXT_cull_vertex),                VER(0,0), N, N, N, N },
 148    { GL(EXT_depth_bounds_test),          VER(0,0), N, N, N, N },
 149    { GL(EXT_draw_range_elements),        VER(1,2), Y, N, Y, N },
 150    { GL(EXT_fog_coord),                  VER(1,4), Y, N, N, N },
 151    { GL(EXT_framebuffer_blit),           VER(0,0), Y, N, N, N },
 152    { GL(EXT_framebuffer_multisample),    VER(0,0), Y, N, N, N },
 153    { GL(EXT_framebuffer_object),         VER(0,0), Y, N, N, N },
 154    { GL(EXT_framebuffer_sRGB),           VER(0,0), Y, N, N, N },
 155    { GL(EXT_multi_draw_arrays),          VER(1,4), Y, N, Y, N },
 156    { GL(EXT_packed_depth_stencil),       VER(0,0), Y, N, N, N },
 157    { GL(EXT_packed_pixels),              VER(1,2), Y, N, N, N },
 158    { GL(EXT_paletted_texture),           VER(0,0), Y, N, N, N },
 159    { GL(EXT_pixel_buffer_object),        VER(0,0), N, N, N, N },
 160    { GL(EXT_point_parameters),           VER(1,4), Y, N, N, N },
 161    { GL(EXT_polygon_offset),             VER(1,1), Y, N, N, N },
 162    { GL(EXT_rescale_normal),             VER(1,2), Y, N, N, N },
 163    { GL(EXT_secondary_color),            VER(1,4), Y, N, N, N },
 164    { GL(EXT_separate_specular_color),    VER(1,2), Y, N, N, N },
 165    { GL(EXT_shadow_funcs),               VER(1,5), Y, N, N, N },
 166    { GL(EXT_shared_texture_palette),     VER(0,0), Y, N, N, N },
 167    { GL(EXT_stencil_two_side),           VER(0,0), Y, N, N, N },
 168    { GL(EXT_stencil_wrap),               VER(1,4), Y, N, N, N },
 169    { GL(EXT_subtexture),                 VER(1,1), Y, N, N, N },
 170    { GL(EXT_texture),                    VER(1,1), Y, N, N, N },
 171    { GL(EXT_texture3D),                  VER(1,2), Y, N, N, N },
 172    { GL(EXT_texture_compression_dxt1),   VER(0,0), Y, N, N, N },
 173    { GL(EXT_texture_compression_s3tc),   VER(0,0), Y, N, N, N },
 174    { GL(EXT_texture_edge_clamp),         VER(1,2), Y, N, N, N },
 175    { GL(EXT_texture_env_add),            VER(1,3), Y, N, N, N },
 176    { GL(EXT_texture_env_combine),        VER(1,3), Y, N, N, N },
 177    { GL(EXT_texture_env_dot3),           VER(0,0), Y, N, N, N },
 178    { GL(EXT_texture_filter_anisotropic), VER(0,0), Y, N, N, N },
 179    { GL(EXT_texture_lod),                VER(1,2), Y, N, N, N },
 180    { GL(EXT_texture_lod_bias),           VER(1,4), Y, N, N, N },
 181    { GL(EXT_texture_mirror_clamp),       VER(0,0), Y, N, N, N },
 182    { GL(EXT_texture_object),             VER(1,1), Y, N, N, N },
 183    { GL(EXT_texture_rectangle),          VER(0,0), Y, N, N, N },
 184    { GL(EXT_vertex_array),               VER(0,0), Y, N, N, N },
 185    { GL(3DFX_texture_compression_FXT1),  VER(0,0), Y, N, N, N },
 186    { GL(APPLE_packed_pixels),            VER(1,2), Y, N, N, N },
 187    { GL(APPLE_ycbcr_422),                VER(0,0), Y, N, N, N },
 188    { GL(ATI_draw_buffers),               VER(0,0), Y, N, N, N },
 189    { GL(ATI_text_fragment_shader),       VER(0,0), Y, N, N, N },
 190    { GL(ATI_texture_env_combine3),       VER(0,0), Y, N, N, N },
 191    { GL(ATI_texture_float),              VER(0,0), Y, N, N, N },
 192    { GL(ATI_texture_mirror_once),        VER(0,0), Y, N, N, N },
 193    { GL(ATIX_texture_env_combine3),      VER(0,0), Y, N, N, N },
 194    { GL(HP_convolution_border_modes),    VER(0,0), Y, N, N, N },
 195    { GL(HP_occlusion_test),              VER(0,0), Y, N, N, N },
 196    { GL(IBM_cull_vertex),                VER(0,0), Y, N, N, N },
 197    { GL(IBM_pixel_filter_hint),          VER(0,0), Y, N, N, N },
 198    { GL(IBM_rasterpos_clip),             VER(0,0), Y, N, N, N },
 199    { GL(IBM_texture_clamp_nodraw),       VER(0,0), Y, N, N, N },
 200    { GL(IBM_texture_mirrored_repeat),    VER(0,0), Y, N, N, N },
 201    { GL(INGR_blend_func_separate),       VER(0,0), Y, N, N, N },
 202    { GL(INGR_interlace_read),            VER(0,0), Y, N, N, N },
 203    { GL(MESA_pack_invert),               VER(0,0), Y, N, N, N },
 204    { GL(MESA_ycbcr_texture),             VER(0,0), Y, N, N, N },
 205    { GL(NV_blend_square),                VER(1,4), Y, N, N, N },
 206    { GL(NV_copy_depth_to_color),         VER(0,0), Y, N, N, N },
 207    { GL(NV_depth_clamp),                 VER(0,0), Y, N, N, N },
 208    { GL(NV_fog_distance),                VER(0,0), Y, N, N, N },
 209    { GL(NV_fragment_program),            VER(0,0), Y, N, N, N },
 210    { GL(NV_fragment_program_option),     VER(0,0), Y, N, N, N },
 211    { GL(NV_fragment_program2),           VER(0,0), Y, N, N, N },
 212    { GL(NV_light_max_exponent),          VER(0,0), Y, N, N, N },
 213    { GL(NV_multisample_filter_hint),     VER(0,0), Y, N, N, N },
 214    { GL(NV_packed_depth_stencil),        VER(0,0), Y, N, N, N },
 215    { GL(NV_point_sprite),                VER(0,0), Y, N, N, N },
 216    { GL(NV_texgen_reflection),           VER(0,0), Y, N, N, N },
 217    { GL(NV_texture_compression_vtc),     VER(0,0), Y, N, N, N },
 218    { GL(NV_texture_env_combine4),        VER(0,0), Y, N, N, N },
 219    { GL(NV_texture_rectangle),           VER(0,0), Y, N, N, N },
 220    { GL(NV_vertex_program),              VER(0,0), Y, N, N, N },
 221    { GL(NV_vertex_program1_1),           VER(0,0), Y, N, N, N },
 222    { GL(NV_vertex_program2),             VER(0,0), Y, N, N, N },
 223    { GL(NV_vertex_program2_option),      VER(0,0), Y, N, N, N },
 224    { GL(NV_vertex_program3),             VER(0,0), Y, N, N, N },
 225    { GL(OES_read_format),                VER(0,0), Y, N, N, N },
 226    { GL(OES_compressed_paletted_texture),VER(0,0), Y, N, N, N },
 227    { GL(SGI_color_matrix),               VER(0,0), Y, N, N, N },
 228    { GL(SGI_color_table),                VER(0,0), Y, N, N, N },
 229    { GL(SGI_texture_color_table),        VER(0,0), Y, N, N, N },
 230    { GL(SGIS_generate_mipmap),           VER(1,4), Y, N, N, N },
 231    { GL(SGIS_multisample),               VER(0,0), Y, N, N, N },
 232    { GL(SGIS_texture_border_clamp),      VER(1,3), Y, N, N, N },
 233    { GL(SGIS_texture_edge_clamp),        VER(1,2), Y, N, N, N },
 234    { GL(SGIS_texture_lod),               VER(1,2), Y, N, N, N },
 235    { GL(SGIX_blend_alpha_minmax),        VER(0,0), Y, N, N, N },
 236    { GL(SGIX_clipmap),                   VER(0,0), Y, N, N, N },
 237    { GL(SGIX_depth_texture),             VER(0,0), Y, N, N, N },
 238    { GL(SGIX_fog_offset),                VER(0,0), Y, N, N, N },
 239    { GL(SGIX_shadow),                    VER(0,0), Y, N, N, N },
 240    { GL(SGIX_shadow_ambient),            VER(0,0), Y, N, N, N },
 241    { GL(SGIX_texture_coordinate_clamp),  VER(0,0), Y, N, N, N },
 242    { GL(SGIX_texture_lod_bias),          VER(0,0), Y, N, N, N },
 243    { GL(SGIX_texture_range),             VER(0,0), Y, N, N, N },
 244    { GL(SGIX_texture_scale_bias),        VER(0,0), Y, N, N, N },
 245    { GL(SGIX_vertex_preclip),            VER(0,0), Y, N, N, N },
 246    { GL(SGIX_vertex_preclip_hint),       VER(0,0), Y, N, N, N },
 247    { GL(SGIX_ycrcb),                     VER(0,0), Y, N, N, N },
 248    { GL(SUN_convolution_border_modes),   VER(0,0), Y, N, N, N },
 249    { GL(SUN_multi_draw_arrays),          VER(0,0), Y, N, Y, N },
 250    { GL(SUN_slice_accum),                VER(0,0), Y, N, N, N },
 251    { NULL }
 252 };
 253 /* *INDENT-ON* */
 254
 255
 256 /* global bit-fields of available extensions and their characteristics */
 257 static unsigned char client_glx_support[8];
 258 static unsigned char client_glx_only[8];
 259 static unsigned char direct_glx_only[8];
 260 static unsigned char client_gl_support[__GL_EXT_BYTES];
 261 static unsigned char client_gl_only[__GL_EXT_BYTES];
 262
 263 /**
 264  * Bits representing the set of extensions that are enabled by default in all
 265  * direct rendering drivers.
 266  */
 267 static unsigned char direct_glx_support[8];
 268
 269 /**
 270  * Highest core GL version that can be supported for indirect rendering.
 271  */
 272 static const unsigned gl_major = 1;
 273 static const unsigned gl_minor = 4;
 274
 275 /* client extensions string */
 276 static const char *__glXGLXClientExtensions = NULL;
 277
 278 static void __glXExtensionsCtr(void);
 279 static void __glXExtensionsCtrScreen(struct glx_screen * psc);
 280 static void __glXProcessServerString(const struct extension_info *ext,
 281                                      const char *server_string,
 282                                      unsigned char *server_support);
 283
 284 /**
 285  * Set the state of a GLX extension.
 286  *
 287  * \param name      Name of the extension.
 288  * \param name_len  Length, in characters, of the extension name.
 289  * \param state     New state (either enabled or disabled) of the extension.
 290  * \param supported Table in which the state of the extension is to be set.
 291  */
 292 static void
 293 set_glx_extension(const struct extension_info *ext,
 294                   const char *name, unsigned name_len, GLboolean state,
 295                   unsigned char *supported)
 296 {
 297    unsigned i;
 298
 299
 300    for (i = 0; ext[i].name != NULL; i++) {
 301       if ((name_len == ext[i].name_len)
 302           && (strncmp(ext[i].name, name, name_len) == 0)) {
 303          if (state) {
 304             SET_BIT(supported, ext[i].bit);
 305          }
 306          else {
 307             CLR_BIT(supported, ext[i].bit);
 308          }
 309
 310          return;
 311       }
 312    }
 313 }
 314
 315
 316 #define NUL '\0'
 317 #define SEPARATOR ' '
 318
 319 /**
 320  * Convert the server's extension string to a bit-field.
 321  *
 322  * \param server_string   GLX extension string from the server.
 323  * \param server_support  Bit-field of supported extensions.
 324  *
 325  * \note
 326  * This function is used to process both GLX and GL extension strings.  The
 327  * bit-fields used to track each of these have different sizes.  Therefore,
 328  * the data pointed by \c server_support must be preinitialized to zero.
 329  */
 330 static void
 331 __glXProcessServerString(const struct extension_info *ext,
 332                          const char *server_string,
 333                          unsigned char *server_support)
 334 {
 335    unsigned base;
 336    unsigned len;
 337
 338    for (base = 0; server_string[base] != NUL; /* empty */ ) {
 339       /* Determine the length of the next extension name.
 340        */
 341       for (len = 0; (server_string[base + len] != SEPARATOR)
 342            && (server_string[base + len] != NUL); len++) {
 343          /* empty */
 344       }
 345
 346       /* Set the bit for the extension in the server_support table.
 347        */
 348       set_glx_extension(ext, &server_string[base], len, GL_TRUE,
 349                         server_support);
 350
 351
 352       /* Advance to the next extension string.  This means that we skip
 353        * over the previous string and any trialing white-space.
 354        */
 355       for (base += len; (server_string[base] == SEPARATOR)
 356            && (server_string[base] != NUL); base++) {
 357          /* empty */
 358       }
 359    }
 360 }
 361
 362 void
 363 __glXEnableDirectExtension(struct glx_screen * psc, const char *name)
 364 {
 365    __glXExtensionsCtr();
 366    __glXExtensionsCtrScreen(psc);
 367
 368    set_glx_extension(known_glx_extensions,
 369                      name, strlen(name), GL_TRUE, psc->direct_support);
 370 }
 371
 372 /**
 373  * Initialize global extension support tables.
 374  */
 375
 376 static void
 377 __glXExtensionsCtr(void)
 378 {
 379    unsigned i;
 380    static GLboolean ext_list_first_time = GL_TRUE;
 381
 382
 383    if (ext_list_first_time) {
 384       ext_list_first_time = GL_FALSE;
 385
 386       (void) memset(client_glx_support, 0, sizeof(client_glx_support));
 387       (void) memset(direct_glx_support, 0, sizeof(direct_glx_support));
 388       (void) memset(client_glx_only, 0, sizeof(client_glx_only));
 389       (void) memset(direct_glx_only, 0, sizeof(direct_glx_only));
 390
 391       (void) memset(client_gl_support, 0, sizeof(client_gl_support));
 392       (void) memset(client_gl_only, 0, sizeof(client_gl_only));
 393
 394       for (i = 0; known_glx_extensions[i].name != NULL; i++) {
 395          const unsigned bit = known_glx_extensions[i].bit;
 396
 397          if (known_glx_extensions[i].client_support) {
 398             SET_BIT(client_glx_support, bit);
 399          }
 400
 401          if (known_glx_extensions[i].direct_support) {
 402             SET_BIT(direct_glx_support, bit);
 403          }
 404
 405          if (known_glx_extensions[i].client_only) {
 406             SET_BIT(client_glx_only, bit);
 407          }
 408
 409          if (known_glx_extensions[i].direct_only) {
 410             SET_BIT(direct_glx_only, bit);
 411          }
 412       }
 413
 414       for (i = 0; known_gl_extensions[i].name != NULL; i++) {
 415          const unsigned bit = known_gl_extensions[i].bit;
 416
 417          if (known_gl_extensions[i].client_support) {
 418             SET_BIT(client_gl_support, bit);
 419          }
 420
 421          if (known_gl_extensions[i].client_only) {
 422             SET_BIT(client_gl_only, bit);
 423          }
 424       }
 425
 426 #if 0
 427       fprintf(stderr, "[%s:%u] Maximum client library version: %u.%u\n",
 428               __func__, __LINE__, gl_major, gl_minor);
 429 #endif
 430    }
 431 }
 432
 433
 434 /**
 435  * Make sure that per-screen direct-support table is initialized.
 436  *
 437  * \param psc  Pointer to GLX per-screen record.
 438  */
 439
 440 static void
 441 __glXExtensionsCtrScreen(struct glx_screen * psc)
 442 {
 443    if (psc->ext_list_first_time) {
 444       psc->ext_list_first_time = GL_FALSE;
 445       (void) memcpy(psc->direct_support, direct_glx_support,
 446                     sizeof(direct_glx_support));
 447    }
 448 }
 449
 450
 451 /**
 452  * Check if a certain extension is enabled on a given screen.
 453  *
 454  * \param psc  Pointer to GLX per-screen record.
 455  * \param bit  Bit index in the direct-support table.
 456  * \returns If the extension bit is enabled for the screen, \c GL_TRUE is
 457  *          returned.  If the extension bit is not enabled or if \c psc is
 458  *          \c NULL, then \c GL_FALSE is returned.
 459  */
 460 GLboolean
 461 __glXExtensionBitIsEnabled(struct glx_screen * psc, unsigned bit)
 462 {
 463    GLboolean enabled = GL_FALSE;
 464
 465    if (psc != NULL) {
 466       __glXExtensionsCtr();
 467       __glXExtensionsCtrScreen(psc);
 468       enabled = EXT_ENABLED(bit, psc->direct_support);
 469    }
 470
 471    return enabled;
 472 }
 473
 474
 475 /**
 476  * Check if a certain extension is enabled in a given context.
 477  *
 478  */
 479 GLboolean
 480 __glExtensionBitIsEnabled(struct glx_context *gc, unsigned bit)
 481 {
 482    GLboolean enabled = GL_FALSE;
 483
 484    if (gc != NULL) {
 485       enabled = EXT_ENABLED(bit, gc->gl_extension_bits);
 486    }
 487
 488    return enabled;
 489 }
 490
 491
 492
 493 /**
 494  * Convert a bit-field to a string of supported extensions.
 495  */
 496 static char *
 497 __glXGetStringFromTable(const struct extension_info *ext,
 498                         const unsigned char *supported)
 499 {
 500    unsigned i;
 501    unsigned ext_str_len;
 502    char *ext_str;
 503    char *point;
 504
 505
 506    ext_str_len = 0;
 507    for (i = 0; ext[i].name != NULL; i++) {
 508       if (EXT_ENABLED(ext[i].bit, supported)) {
 509          ext_str_len += ext[i].name_len + 1;
 510       }
 511    }
 512
 513    ext_str = malloc(ext_str_len + 1);
 514    if (ext_str != NULL) {
 515       point = ext_str;
 516
 517       for (i = 0; ext[i].name != NULL; i++) {
 518          if (EXT_ENABLED(ext[i].bit, supported)) {
 519             (void) memcpy(point, ext[i].name, ext[i].name_len);
 520             point += ext[i].name_len;
 521
 522             *point = ' ';
 523             point++;
 524          }
 525       }
 526
 527       *point = '\0';
 528    }
 529
 530    return ext_str;
 531 }
 532
 533
 534 /**
 535  * Get the string of client library supported extensions.
 536  */
 537 const char *
 538 __glXGetClientExtensions(void)
 539 {
 540    if (__glXGLXClientExtensions == NULL) {
 541       __glXExtensionsCtr();
 542       __glXGLXClientExtensions = __glXGetStringFromTable(known_glx_extensions,
 543                                                          client_glx_support);
 544    }
 545
 546    return __glXGLXClientExtensions;
 547 }
 548
 549
 550 /**
 551  * Calculate the list of application usable extensions.  The resulting
 552  * string is stored in \c psc->effectiveGLXexts.
 553  *
 554  * \param psc                        Pointer to GLX per-screen record.
 555  * \param display_is_direct_capable  True if the display is capable of
 556  *                                   direct rendering.
 557  * \param minor_version              GLX minor version from the server.
 558  */
 559
 560 void
 561 __glXCalculateUsableExtensions(struct glx_screen * psc,
 562                                GLboolean display_is_direct_capable,
 563                                int minor_version)
 564 {
 565    unsigned char server_support[8];
 566    unsigned char usable[8];
 567    unsigned i;
 568
 569    __glXExtensionsCtr();
 570    __glXExtensionsCtrScreen(psc);
 571
 572    (void) memset(server_support, 0, sizeof(server_support));
 573    __glXProcessServerString(known_glx_extensions,
 574                             psc->serverGLXexts, server_support);
 575
 576
 577    /* This is a hack.  Some servers support GLX 1.3 but don't export
 578     * all of the extensions implied by GLX 1.3.  If the server claims
 579     * support for GLX 1.3, enable support for the extensions that can be
 580     * "emulated" as well.
 581     */
 582 #ifndef GLX_USE_APPLEGL
 583    if (minor_version >= 3) {
 584       SET_BIT(server_support, EXT_visual_info_bit);
 585       SET_BIT(server_support, EXT_visual_rating_bit);
 586       SET_BIT(server_support, SGI_make_current_read_bit);
 587       SET_BIT(server_support, SGIX_fbconfig_bit);
 588       SET_BIT(server_support, SGIX_pbuffer_bit);
 589
 590       /* This one is a little iffy.  GLX 1.3 doesn't incorporate all of this
 591        * extension.  However, the only part that is not strictly client-side
 592        * is shared.  That's the glXQueryContext / glXQueryContextInfoEXT
 593        * function.
 594        */
 595
 596       SET_BIT(server_support, EXT_import_context_bit);
 597    }
 598 #endif
 599
 600    /* An extension is supported if the client-side (i.e., libGL) supports
 601     * it and the "server" supports it.  In this case that means that either
 602     * the true server supports it or it is only for direct-rendering and
 603     * the direct rendering driver supports it.
 604     *
 605     * If the display is not capable of direct rendering, then the extension
 606     * is enabled if and only if the client-side library and the server
 607     * support it.
 608     */
 609
 610    if (display_is_direct_capable) {
 611       for (i = 0; i < 8; i++) {
 612          usable[i] = (client_glx_support[i] & client_glx_only[i])
 613             | (client_glx_support[i] & psc->direct_support[i] &
 614                server_support[i])
 615             | (client_glx_support[i] & psc->direct_support[i] &
 616                direct_glx_only[i]);
 617       }
 618    }
 619    else {
 620       for (i = 0; i < 8; i++) {
 621          usable[i] = (client_glx_support[i] & client_glx_only[i])
 622             | (client_glx_support[i] & server_support[i]);
 623       }
 624    }
 625
 626    /* This hack is necessary because GLX_ARB_create_context_profile depends on
 627     * server support, but GLX_EXT_create_context_es2_profile is direct-only.
 628     * Without this hack, it would be possible to advertise
 629     * GLX_EXT_create_context_es2_profile without
 630     * GLX_ARB_create_context_profile.  That would be a problem.
 631     */
 632    if (!IS_SET(server_support, ARB_create_context_profile_bit)) {
 633       CLR_BIT(usable, EXT_create_context_es2_profile_bit);
 634    }
 635
 636    psc->effectiveGLXexts = __glXGetStringFromTable(known_glx_extensions,
 637                                                    usable);
 638 }
 639
 640
 641 /**
 642  * Calculate the list of application usable extensions.  The resulting
 643  * string is stored in \c gc->extensions.
 644  *
 645  * \param gc             Pointer to GLX context.
 646  * \param server_string  Extension string from the server.
 647  * \param major_version  GL major version from the server.
 648  * \param minor_version  GL minor version from the server.
 649  */
 650
 651 void
 652 __glXCalculateUsableGLExtensions(struct glx_context * gc,
 653                                  const char *server_string,
 654                                  int major_version, int minor_version)
 655 {
 656    unsigned char server_support[__GL_EXT_BYTES];
 657    unsigned char usable[__GL_EXT_BYTES];
 658    unsigned i;
 659
 660
 661    __glXExtensionsCtr();
 662
 663    (void) memset(server_support, 0, sizeof(server_support));
 664    __glXProcessServerString(known_gl_extensions, server_string,
 665                             server_support);
 666
 667
 668    /* Handle lazy servers that don't export all the extensions strings that
 669     * are part of the GL core version that they support.
 670     */
 671
 672    for (i = 0; i < __GL_EXT_BYTES; i++) {
 673       if ((known_gl_extensions[i].version_major != 0)
 674           && ((major_version > known_gl_extensions[i].version_major)
 675               || ((major_version == known_gl_extensions[i].version_major)
 676                   && (minor_version >=
 677                       known_gl_extensions[i].version_minor)))) {
 678          SET_BIT(server_support, known_gl_extensions[i].bit);
 679       }
 680    }
 681
 682
 683    /* An extension is supported if the client-side (i.e., libGL) supports
 684     * it and the server supports it or the client-side library supports it
 685     * and it only needs client-side support.
 686     */
 687
 688    for (i = 0; i < __GL_EXT_BYTES; i++) {
 689       usable[i] = (client_gl_support[i] & client_gl_only[i])
 690          | (client_gl_support[i] & server_support[i]);
 691    }
 692
 693    gc->extensions = (unsigned char *)
 694       __glXGetStringFromTable(known_gl_extensions, usable);
 695    (void) memcpy(gc->gl_extension_bits, usable, sizeof(usable));
 696 }
 697
 698
 699 /**
 700  * Calculates the maximum core GL version that can be supported for indirect
 701  * rendering.
 702  */
 703 void
 704 __glXGetGLVersion(int *major_version, int *minor_version)
 705 {
 706    __glXExtensionsCtr();
 707    *major_version = gl_major;
 708    *minor_version = gl_minor;
 709 }
 710
 711
 712 /**
 713  * Get a string representing the set of extensions supported by the client
 714  * library.  This is currently only used to send the list of extensions
 715  * supported by the client to the server.
 716  */
 717 char *
 718 __glXGetClientGLExtensionString(void)
 719 {
 720    __glXExtensionsCtr();
 721    return __glXGetStringFromTable(known_gl_extensions, client_gl_support);
 722 }