src/mesa/state_tracker/st_extensions.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright (c) 2008 VMware, Inc.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * 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
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #include "main/imports.h"
  30 #include "main/context.h"
  31 #include "main/macros.h"
  32 #include "main/mfeatures.h"
  33
  34 #include "pipe/p_context.h"
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_screen.h"
  37
  38 #include "st_context.h"
  39 #include "st_extensions.h"
  40
  41
  42 static int _min(int a, int b)
  43 {
  44    return (a < b) ? a : b;
  45 }
  46
  47 static float _maxf(float a, float b)
  48 {
  49    return (a > b) ? a : b;
  50 }
  51
  52 static int _clamp(int a, int min, int max)
  53 {
  54    if (a < min)
  55       return min;
  56    else if (a > max)
  57       return max;
  58    else
  59       return a;
  60 }
  61
  62
  63 /**
  64  * Query driver to get implementation limits.
  65  * Note that we have to limit/clamp against Mesa's internal limits too.
  66  */
  67 void st_init_limits(struct st_context *st)
  68 {
  69    struct pipe_screen *screen = st->pipe->screen;
  70    struct gl_constants *c = &st->ctx->Const;
  71    gl_shader_type sh;
  72
  73    c->MaxTextureLevels
  74       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
  75             MAX_TEXTURE_LEVELS);
  76
  77    c->Max3DTextureLevels
  78       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
  79             MAX_3D_TEXTURE_LEVELS);
  80
  81    c->MaxCubeTextureLevels
  82       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
  83             MAX_CUBE_TEXTURE_LEVELS);
  84
  85    c->MaxTextureRectSize
  86       = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
  87
  88    c->MaxTextureImageUnits
  89       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS),
  90             MAX_TEXTURE_IMAGE_UNITS);
  91
  92    c->MaxVertexTextureImageUnits
  93       = _min(screen->get_param(screen, PIPE_CAP_MAX_VERTEX_TEXTURE_UNITS),
  94              MAX_VERTEX_TEXTURE_IMAGE_UNITS);
  95
  96    c->MaxCombinedTextureImageUnits
  97       = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
  98              MAX_COMBINED_TEXTURE_IMAGE_UNITS);
  99
 100    c->MaxTextureCoordUnits
 101       = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
 102
 103    c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);
 104
 105    c->MaxDrawBuffers
 106       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 107               1, MAX_DRAW_BUFFERS);
 108
 109    c->MaxLineWidth
 110       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH));
 111    c->MaxLineWidthAA
 112       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_LINE_WIDTH_AA));
 113
 114    c->MaxPointSize
 115       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH));
 116    c->MaxPointSizeAA
 117       = _maxf(1.0f, screen->get_paramf(screen, PIPE_CAP_MAX_POINT_WIDTH_AA));
 118    /* called after _mesa_create_context/_mesa_init_point, fix default user
 119     * settable max point size up
 120     */
 121    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 122    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 123     * for non-aa sizes, but we can go down to 0.0 for aa points.
 124     */
 125    c->MinPointSize = 1.0f;
 126    c->MinPointSizeAA = 0.0f;
 127
 128    c->MaxTextureMaxAnisotropy
 129       = _maxf(2.0f, screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_ANISOTROPY));
 130
 131    c->MaxTextureLodBias
 132       = screen->get_paramf(screen, PIPE_CAP_MAX_TEXTURE_LOD_BIAS);
 133
 134    c->MaxDrawBuffers
 135       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 136               1, MAX_DRAW_BUFFERS);
 137
 138    /* Quads always follow GL provoking rules. */
 139    c->QuadsFollowProvokingVertexConvention = GL_FALSE;
 140
 141    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 142       struct gl_shader_compiler_options *options =
 143          &st->ctx->ShaderCompilerOptions[sh];
 144       struct gl_program_constants *pc;
 145
 146       switch (sh) {
 147       case PIPE_SHADER_FRAGMENT:
 148          pc = &c->FragmentProgram;
 149          break;
 150       case PIPE_SHADER_VERTEX:
 151          pc = &c->VertexProgram;
 152          break;
 153       case PIPE_SHADER_GEOMETRY:
 154          pc = &c->GeometryProgram;
 155          break;
 156       default:
 157          assert(0);
 158          continue;
 159       }
 160
 161       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 162       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 163       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 164       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 165       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 166       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 167       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 168       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 169       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 170       /* raise MaxParameters if native support is higher */
 171       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 172
 173       options->EmitNoNoise = TRUE;
 174
 175       /* TODO: make these more fine-grained if anyone needs it */
 176       options->EmitNoIfs = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 177       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 178       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 179       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 180
 181       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 182
 183       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 184                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 185       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 186                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 187       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 188                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 189       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 190                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 191
 192       if (options->EmitNoLoops)
 193          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 194    }
 195
 196    /* PIPE_CAP_MAX_FS_INPUTS specifies the number of COLORn + GENERICn inputs
 197     * and is set in MaxNativeAttribs. It's always 2 colors + N generic
 198     * attributes. The GLSL compiler never uses COLORn for varyings, so we
 199     * subtract the 2 colors to get the maximum number of varyings (generic
 200     * attributes) supported by a driver. */
 201    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT, PIPE_SHADER_CAP_MAX_INPUTS) - 2;
 202    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 203
 204    /* XXX we'll need a better query here someday */
 205    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 206       c->GLSLVersion = 120;
 207    }
 208 }
 209
 210
 211 /**
 212  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 213  * which GL extensions are supported.
 214  * Quite a few extensions are always supported because they are standard
 215  * features or can be built on top of other gallium features.
 216  * Some fine tuning may still be needed.
 217  */
 218 void st_init_extensions(struct st_context *st)
 219 {
 220    struct pipe_screen *screen = st->pipe->screen;
 221    struct gl_context *ctx = st->ctx;
 222
 223    /*
 224     * Extensions that are supported by all Gallium drivers:
 225     */
 226    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 227    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 228    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 229    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 230    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 231    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 232    ctx->Extensions.ARB_multisample = GL_TRUE;
 233    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 234    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 235    ctx->Extensions.ARB_texture_compression = GL_TRUE;
 236    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 237    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 238    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 239    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 240    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 241    ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
 242    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 243    ctx->Extensions.ARB_window_pos = GL_TRUE;
 244
 245    ctx->Extensions.EXT_blend_color = GL_TRUE;
 246    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 247    ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
 248    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 249    ctx->Extensions.EXT_blend_subtract = GL_TRUE;
 250    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 251    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 252    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 253    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 254    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 255    ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
 256    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 257    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 258    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 259    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 260    ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
 261    ctx->Extensions.EXT_texture_env_add = GL_TRUE;
 262    ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
 263    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 264    ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
 265    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 266    if (ctx->API == API_OPENGLES || ctx->API == API_OPENGLES2)
 267            ctx->Extensions.EXT_texture_format_BGRA8888 = GL_TRUE;
 268
 269    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 270
 271    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 272
 273    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 274
 275    ctx->Extensions.NV_blend_square = GL_TRUE;
 276    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 277    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 278    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 279 #if 0
 280    /* possibly could support the following two */
 281    ctx->Extensions.NV_vertex_program = GL_TRUE;
 282    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 283 #endif
 284
 285 #if FEATURE_OES_EGL_image
 286    ctx->Extensions.OES_EGL_image = GL_TRUE;
 287 #endif
 288 #if FEATURE_OES_draw_texture
 289    ctx->Extensions.OES_draw_texture = GL_TRUE;
 290 #endif
 291
 292    ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 293
 294    /*
 295     * Extensions that depend on the driver/hardware:
 296     */
 297    if (screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS) > 0) {
 298       ctx->Extensions.ARB_draw_buffers = GL_TRUE;
 299    }
 300
 301    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
 302       ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 303    }
 304
 305    if (screen->get_param(screen, PIPE_CAP_GLSL)) {
 306       ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 307       ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 308       ctx->Extensions.ARB_shader_objects = GL_TRUE;
 309       ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 310       ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 311       ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 312    }
 313
 314    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_REPEAT) > 0) {
 315       ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
 316    }
 317
 318    if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
 319       ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 320    }
 321
 322    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
 323       ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 324       ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 325    }
 326
 327    if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
 328       ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 329    }
 330
 331    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_IMAGE_UNITS) > 1) {
 332       ctx->Extensions.ARB_multitexture = GL_TRUE;
 333    }
 334
 335    if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 336       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 337       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 338    }
 339
 340    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 341       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 342    }
 343
 344    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 345       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 346       /* GL_NV_point_sprite is not supported by gallium because we don't
 347        * support the GL_POINT_SPRITE_R_MODE_NV option.
 348        */
 349    }
 350
 351    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 352       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 353       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 354    }
 355    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 356      ctx->Extensions.EXT_timer_query = GL_TRUE;
 357    }
 358
 359    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 360       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 361       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 362       ctx->Extensions.ARB_shadow = GL_TRUE;
 363       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 364       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 365    }
 366
 367    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 368     * a depth/stencil buffer and texture from depth/stencil source.
 369     */
 370    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 371                                    PIPE_TEXTURE_2D, 0,
 372                                    PIPE_BIND_DEPTH_STENCIL) &&
 373        screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 374                                    PIPE_TEXTURE_2D, 0,
 375                                    PIPE_BIND_SAMPLER_VIEW)) {
 376       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 377    }
 378    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 379                                         PIPE_TEXTURE_2D, 0,
 380                                         PIPE_BIND_DEPTH_STENCIL) &&
 381             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 382                                         PIPE_TEXTURE_2D, 0,
 383                                         PIPE_BIND_SAMPLER_VIEW)) {
 384       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 385    }
 386
 387    /* float support - assume nothing exclusively supports 64-bit floats */
 388    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 389                                    PIPE_TEXTURE_2D, 0,
 390                                    PIPE_BIND_SAMPLER_VIEW |
 391                                    PIPE_BIND_RENDER_TARGET) &&
 392       screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 393                                    PIPE_TEXTURE_2D, 0,
 394                                    PIPE_BIND_SAMPLER_VIEW |
 395                                    PIPE_BIND_RENDER_TARGET)) {
 396       ctx->Extensions.ARB_texture_float = GL_TRUE;
 397    }
 398
 399    /* sRGB support */
 400    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 401                                    PIPE_TEXTURE_2D, 0,
 402                                    PIPE_BIND_SAMPLER_VIEW) ||
 403       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 404                                    PIPE_TEXTURE_2D, 0,
 405                                    PIPE_BIND_SAMPLER_VIEW)) {
 406       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 407       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 408       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 409                                    PIPE_TEXTURE_2D, 0,
 410                                    PIPE_BIND_RENDER_TARGET) ||
 411           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 412                                    PIPE_TEXTURE_2D, 0,
 413                                    PIPE_BIND_RENDER_TARGET)) {
 414          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 415          ctx->Const.sRGBCapable = GL_TRUE;
 416       }
 417    }
 418
 419    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 420                                    PIPE_TEXTURE_2D, 0,
 421                                    PIPE_BIND_SAMPLER_VIEW)) {
 422       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 423    }
 424
 425    /* s3tc support */
 426    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 427                                    PIPE_TEXTURE_2D, 0,
 428                                    PIPE_BIND_SAMPLER_VIEW) &&
 429        ctx->Mesa_DXTn) {
 430       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 431       ctx->Extensions.S3_s3tc = GL_TRUE;
 432    }
 433
 434    if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
 435                                    PIPE_TEXTURE_2D, 0,
 436                                    PIPE_BIND_SAMPLER_VIEW) &&
 437        screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
 438                                    PIPE_TEXTURE_2D, 0,
 439                                    PIPE_BIND_SAMPLER_VIEW) &&
 440        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
 441                                    PIPE_TEXTURE_2D, 0,
 442                                    PIPE_BIND_SAMPLER_VIEW) &&
 443        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
 444                                    PIPE_TEXTURE_2D, 0,
 445                                    PIPE_BIND_SAMPLER_VIEW)
 446        ) {
 447      ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
 448    }
 449
 450    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM,
 451                                    PIPE_TEXTURE_2D, 0,
 452                                    PIPE_BIND_SAMPLER_VIEW) &&
 453        screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM,
 454                                    PIPE_TEXTURE_2D, 0,
 455                                    PIPE_BIND_SAMPLER_VIEW) &&
 456        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 457                                    PIPE_TEXTURE_2D, 0,
 458                                    PIPE_BIND_SAMPLER_VIEW) &&
 459        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM,
 460                                    PIPE_TEXTURE_2D, 0,
 461                                    PIPE_BIND_SAMPLER_VIEW)) {
 462       ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
 463    }
 464
 465    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 466                                    PIPE_TEXTURE_2D, 0,
 467                                    PIPE_BIND_SAMPLER_VIEW)) {
 468       ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
 469    }
 470
 471    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 472                                    PIPE_TEXTURE_2D, 0,
 473                                    PIPE_BIND_SAMPLER_VIEW)) {
 474       ctx->Extensions.EXT_texture_snorm = GL_TRUE;
 475    }
 476
 477    /* ycbcr support */
 478    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 479                                    PIPE_TEXTURE_2D, 0,
 480                                    PIPE_BIND_SAMPLER_VIEW) ||
 481        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 482                                    PIPE_TEXTURE_2D, 0,
 483                                    PIPE_BIND_SAMPLER_VIEW)) {
 484       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 485    }
 486
 487    /* GL_EXT_texture_array */
 488    if (screen->get_param(screen, PIPE_CAP_ARRAY_TEXTURES)) {
 489       ctx->Extensions.EXT_texture_array = GL_TRUE;
 490       ctx->Extensions.MESA_texture_array = GL_TRUE;
 491    }
 492
 493    /* GL_ARB_framebuffer_object */
 494    if (ctx->Extensions.EXT_packed_depth_stencil) {
 495       /* we support always support GL_EXT_framebuffer_blit */
 496       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 497    }
 498
 499    if (st->pipe->render_condition) {
 500       ctx->Extensions.NV_conditional_render = GL_TRUE;
 501    }
 502
 503    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 504       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 505    }
 506
 507    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 508       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 509    }
 510
 511    /* GL_ARB_half_float_vertex */
 512    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 513                                    PIPE_BUFFER, 0,
 514                                    PIPE_BIND_VERTEX_BUFFER)) {
 515       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 516    }
 517
 518    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FIXED,
 519                                    PIPE_BUFFER, 0,
 520                                    PIPE_BIND_VERTEX_BUFFER)) {
 521       ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 522    }
 523
 524    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY, PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 525 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 526       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 527 #endif
 528    }
 529
 530    if (screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 531       ctx->Extensions.NV_primitive_restart = GL_TRUE;
 532    }
 533
 534    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLAMP)) {
 535       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 536    }
 537
 538    /* This extension does not actually require support of floating point
 539     * render targets, just clamping controls.
 540     * Advertise this extension if either fragment color clamping is supported
 541     * or no render targets having color values outside of the range [0, 1]
 542     * are supported, in which case the fragment color clamping has no effect
 543     * on rendering.
 544     */
 545    if (screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL) ||
 546        (!screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 547                                      PIPE_TEXTURE_2D, 0,
 548                                      PIPE_BIND_RENDER_TARGET) &&
 549         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM,
 550                                      PIPE_TEXTURE_2D, 0,
 551                                      PIPE_BIND_RENDER_TARGET) &&
 552         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 553                                      PIPE_TEXTURE_2D, 0,
 554                                      PIPE_BIND_RENDER_TARGET) &&
 555         !screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 556                                      PIPE_TEXTURE_2D, 0,
 557                                      PIPE_BIND_RENDER_TARGET) &&
 558         !screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 559                                      PIPE_TEXTURE_2D, 0,
 560                                      PIPE_BIND_RENDER_TARGET) &&
 561         !screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 562                                      PIPE_TEXTURE_2D, 0,
 563                                      PIPE_BIND_RENDER_TARGET))) {
 564       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 565    }
 566
 567    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 568       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 569    }
 570
 571    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 572       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 573    }
 574    if (screen->get_param(screen, PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR)) {
 575       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 576    }
 577
 578    if (screen->fence_finish) {
 579       ctx->Extensions.ARB_sync = GL_TRUE;
 580    }
 581
 582    if (st->pipe->texture_barrier) {
 583       ctx->Extensions.NV_texture_barrier = GL_TRUE;
 584    }
 585
 586    if (screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 587                                    PIPE_TEXTURE_2D, 0,
 588                                    PIPE_BIND_SAMPLER_VIEW)) {
 589       ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
 590    }
 591
 592    if (screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 593                                    PIPE_TEXTURE_2D, 0,
 594                                    PIPE_BIND_RENDER_TARGET |
 595                                    PIPE_BIND_SAMPLER_VIEW)) {
 596       ctx->Extensions.EXT_packed_float = GL_TRUE;
 597    }
 598
 599    if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
 600       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 601       ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
 602    }
 603    else if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP)) {
 604       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 605    }
 606 }