reactos/dll/opengl/mesa/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 #include "main/version.h"
  34
  35 #include "pipe/p_context.h"
  36 #include "pipe/p_defines.h"
  37 #include "pipe/p_screen.h"
  38
  39 #include "st_context.h"
  40 #include "st_extensions.h"
  41
  42
  43 static int _min(int a, int b)
  44 {
  45    return (a < b) ? a : b;
  46 }
  47
  48 static float _maxf(float a, float b)
  49 {
  50    return (a > b) ? a : b;
  51 }
  52
  53 static int _clamp(int a, int min, int max)
  54 {
  55    if (a < min)
  56       return min;
  57    else if (a > max)
  58       return max;
  59    else
  60       return a;
  61 }
  62
  63
  64 /**
  65  * Query driver to get implementation limits.
  66  * Note that we have to limit/clamp against Mesa's internal limits too.
  67  */
  68 void st_init_limits(struct st_context *st)
  69 {
  70    struct pipe_screen *screen = st->pipe->screen;
  71    struct gl_constants *c = &st->ctx->Const;
  72    gl_shader_type sh;
  73
  74    c->MaxTextureLevels
  75       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_2D_LEVELS),
  76             MAX_TEXTURE_LEVELS);
  77
  78    c->Max3DTextureLevels
  79       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_3D_LEVELS),
  80             MAX_3D_TEXTURE_LEVELS);
  81
  82    c->MaxCubeTextureLevels
  83       = _min(screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS),
  84             MAX_CUBE_TEXTURE_LEVELS);
  85
  86    c->MaxTextureRectSize
  87       = _min(1 << (c->MaxTextureLevels - 1), MAX_TEXTURE_RECT_SIZE);
  88
  89    c->MaxArrayTextureLayers
  90       = screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS);
  91
  92    c->MaxTextureImageUnits
  93       = _min(screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
  94                                       PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
  95             MAX_TEXTURE_IMAGE_UNITS);
  96
  97    c->MaxVertexTextureImageUnits
  98       = _min(screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
  99                                       PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS),
 100              MAX_VERTEX_TEXTURE_IMAGE_UNITS);
 101
 102    c->MaxCombinedTextureImageUnits
 103       = _min(screen->get_param(screen, PIPE_CAP_MAX_COMBINED_SAMPLERS),
 104              MAX_COMBINED_TEXTURE_IMAGE_UNITS);
 105
 106    c->MaxTextureCoordUnits
 107       = _min(c->MaxTextureImageUnits, MAX_TEXTURE_COORD_UNITS);
 108
 109    c->MaxTextureUnits = _min(c->MaxTextureImageUnits, c->MaxTextureCoordUnits);
 110
 111    c->MaxDrawBuffers
 112       = _clamp(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 113               1, MAX_DRAW_BUFFERS);
 114
 115    c->MaxLineWidth
 116       = _maxf(1.0f, screen->get_paramf(screen,
 117                                        PIPE_CAPF_MAX_LINE_WIDTH));
 118    c->MaxLineWidthAA
 119       = _maxf(1.0f, screen->get_paramf(screen,
 120                                        PIPE_CAPF_MAX_LINE_WIDTH_AA));
 121
 122    c->MaxPointSize
 123       = _maxf(1.0f, screen->get_paramf(screen,
 124                                        PIPE_CAPF_MAX_POINT_WIDTH));
 125    c->MaxPointSizeAA
 126       = _maxf(1.0f, screen->get_paramf(screen,
 127                                        PIPE_CAPF_MAX_POINT_WIDTH_AA));
 128    /* called after _mesa_create_context/_mesa_init_point, fix default user
 129     * settable max point size up
 130     */
 131    st->ctx->Point.MaxSize = MAX2(c->MaxPointSize, c->MaxPointSizeAA);
 132    /* these are not queryable. Note that GL basically mandates a 1.0 minimum
 133     * for non-aa sizes, but we can go down to 0.0 for aa points.
 134     */
 135    c->MinPointSize = 1.0f;
 136    c->MinPointSizeAA = 0.0f;
 137
 138    c->MaxTextureMaxAnisotropy
 139       = _maxf(2.0f, screen->get_paramf(screen,
 140                                  PIPE_CAPF_MAX_TEXTURE_ANISOTROPY));
 141
 142    c->MaxTextureLodBias
 143       = screen->get_paramf(screen, PIPE_CAPF_MAX_TEXTURE_LOD_BIAS);
 144
 145    c->MaxDrawBuffers
 146       = CLAMP(screen->get_param(screen, PIPE_CAP_MAX_RENDER_TARGETS),
 147               1, MAX_DRAW_BUFFERS);
 148
 149    /* Quads always follow GL provoking rules. */
 150    c->QuadsFollowProvokingVertexConvention = GL_FALSE;
 151
 152    for (sh = 0; sh < MESA_SHADER_TYPES; ++sh) {
 153       struct gl_shader_compiler_options *options =
 154          &st->ctx->ShaderCompilerOptions[sh];
 155       struct gl_program_constants *pc;
 156
 157       switch (sh) {
 158       case PIPE_SHADER_FRAGMENT:
 159          pc = &c->FragmentProgram;
 160          break;
 161       case PIPE_SHADER_VERTEX:
 162          pc = &c->VertexProgram;
 163          break;
 164       case PIPE_SHADER_GEOMETRY:
 165          pc = &c->GeometryProgram;
 166          break;
 167       default:
 168          assert(0);
 169          continue;
 170       }
 171
 172       pc->MaxNativeInstructions    = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS);
 173       pc->MaxNativeAluInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS);
 174       pc->MaxNativeTexInstructions = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS);
 175       pc->MaxNativeTexIndirections = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS);
 176       pc->MaxNativeAttribs         = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INPUTS);
 177       pc->MaxNativeTemps           = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_TEMPS);
 178       pc->MaxNativeAddressRegs     = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_ADDRS);
 179       pc->MaxNativeParameters      = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONSTS);
 180       pc->MaxUniformComponents     = 4 * MIN2(pc->MaxNativeParameters, MAX_UNIFORMS);
 181       /* raise MaxParameters if native support is higher */
 182       pc->MaxParameters            = MAX2(pc->MaxParameters, pc->MaxNativeParameters);
 183
 184       /* Gallium doesn't really care about local vs. env parameters so use the
 185        * same limits.
 186        */
 187       pc->MaxLocalParams = MIN2(pc->MaxParameters, MAX_PROGRAM_LOCAL_PARAMS);
 188       pc->MaxEnvParams = MIN2(pc->MaxParameters, MAX_PROGRAM_ENV_PARAMS);
 189
 190       options->EmitNoNoise = TRUE;
 191
 192       /* TODO: make these more fine-grained if anyone needs it */
 193       options->MaxIfDepth = screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 194       options->EmitNoLoops = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH);
 195       options->EmitNoFunctions = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 196       options->EmitNoMainReturn = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_SUBROUTINES);
 197
 198       options->EmitNoCont = !screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_TGSI_CONT_SUPPORTED);
 199
 200       options->EmitNoIndirectInput = !screen->get_shader_param(screen, sh,
 201                                         PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR);
 202       options->EmitNoIndirectOutput = !screen->get_shader_param(screen, sh,
 203                                         PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR);
 204       options->EmitNoIndirectTemp = !screen->get_shader_param(screen, sh,
 205                                         PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR);
 206       options->EmitNoIndirectUniform = !screen->get_shader_param(screen, sh,
 207                                         PIPE_SHADER_CAP_INDIRECT_CONST_ADDR);
 208
 209       if (options->EmitNoLoops)
 210          options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
 211       else
 212          options->MaxUnrollIterations = 255; /* SM3 limit */
 213    }
 214
 215    /* PIPE_SHADER_CAP_MAX_INPUTS for the FS specifies the maximum number
 216     * of inputs. It's always 2 colors + N generic inputs. */
 217    c->MaxVarying = screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 218                                             PIPE_SHADER_CAP_MAX_INPUTS);
 219    c->MaxVarying = MIN2(c->MaxVarying, MAX_VARYING);
 220
 221    c->MinProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MIN_TEXEL_OFFSET);
 222    c->MaxProgramTexelOffset = screen->get_param(screen, PIPE_CAP_MAX_TEXEL_OFFSET);
 223
 224    c->UniformBooleanTrue = ~0;
 225
 226    c->MaxTransformFeedbackSeparateAttribs =
 227       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS);
 228    c->MaxTransformFeedbackSeparateComponents =
 229       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS);
 230    c->MaxTransformFeedbackInterleavedComponents =
 231       screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS);
 232
 233    c->StripTextureBorder = GL_TRUE;
 234
 235    c->GLSLSkipStrictMaxUniformLimitCheck =
 236       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS);
 237
 238    c->GLSLSkipStrictMaxVaryingLimitCheck =
 239       screen->get_param(screen, PIPE_CAP_TGSI_CAN_COMPACT_VARYINGS);
 240 }
 241
 242
 243 static GLboolean st_get_s3tc_override(void)
 244 {
 245    const char *override = _mesa_getenv("force_s3tc_enable");
 246    if (override && !strcmp(override, "true"))
 247       return GL_TRUE;
 248    return GL_FALSE;
 249 }
 250
 251
 252 /**
 253  * Use pipe_screen::get_param() to query PIPE_CAP_ values to determine
 254  * which GL extensions are supported.
 255  * Quite a few extensions are always supported because they are standard
 256  * features or can be built on top of other gallium features.
 257  * Some fine tuning may still be needed.
 258  */
 259 void st_init_extensions(struct st_context *st)
 260 {
 261    struct pipe_screen *screen = st->pipe->screen;
 262    struct gl_context *ctx = st->ctx;
 263    int i;
 264
 265    ctx->Const.GLSLVersion = 120;
 266    _mesa_override_glsl_version(st->ctx);
 267
 268    /*
 269     * Extensions that are supported by all Gallium drivers:
 270     */
 271    ctx->Extensions.ARB_copy_buffer = GL_TRUE;
 272    ctx->Extensions.ARB_draw_elements_base_vertex = GL_TRUE;
 273    ctx->Extensions.ARB_explicit_attrib_location = GL_TRUE;
 274    ctx->Extensions.ARB_fragment_coord_conventions = GL_TRUE;
 275    ctx->Extensions.ARB_fragment_program = GL_TRUE;
 276    ctx->Extensions.ARB_fragment_shader = GL_TRUE;
 277    ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
 278    ctx->Extensions.ARB_map_buffer_range = GL_TRUE;
 279    ctx->Extensions.ARB_sampler_objects = GL_TRUE;
 280    ctx->Extensions.ARB_shader_objects = GL_TRUE;
 281    ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
 282    ctx->Extensions.ARB_texture_border_clamp = GL_TRUE; /* XXX temp */
 283    ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
 284    ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
 285    ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
 286    ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
 287    ctx->Extensions.ARB_texture_storage = GL_TRUE;
 288    ctx->Extensions.ARB_vertex_array_object = GL_TRUE;
 289    ctx->Extensions.ARB_vertex_program = GL_TRUE;
 290    ctx->Extensions.ARB_vertex_shader = GL_TRUE;
 291    ctx->Extensions.ARB_window_pos = GL_TRUE;
 292
 293    ctx->Extensions.EXT_blend_color = GL_TRUE;
 294    ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
 295    ctx->Extensions.EXT_blend_minmax = GL_TRUE;
 296    ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
 297    ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
 298    ctx->Extensions.EXT_framebuffer_multisample = GL_TRUE;
 299    ctx->Extensions.EXT_fog_coord = GL_TRUE;
 300    ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
 301    ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
 302    ctx->Extensions.EXT_point_parameters = GL_TRUE;
 303    ctx->Extensions.EXT_provoking_vertex = GL_TRUE;
 304    ctx->Extensions.EXT_secondary_color = GL_TRUE;
 305    ctx->Extensions.EXT_separate_shader_objects = GL_TRUE;
 306    ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
 307    ctx->Extensions.EXT_vertex_array_bgra = GL_TRUE;
 308
 309    ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
 310
 311    ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
 312
 313    ctx->Extensions.MESA_pack_invert = GL_TRUE;
 314
 315    ctx->Extensions.NV_blend_square = GL_TRUE;
 316    ctx->Extensions.NV_fog_distance = GL_TRUE;
 317    ctx->Extensions.NV_texgen_reflection = GL_TRUE;
 318    ctx->Extensions.NV_texture_env_combine4 = GL_TRUE;
 319    ctx->Extensions.NV_texture_rectangle = GL_TRUE;
 320 #if 0
 321    /* possibly could support the following two */
 322    ctx->Extensions.NV_vertex_program = GL_TRUE;
 323    ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
 324 #endif
 325
 326 #if FEATURE_OES_EGL_image
 327    ctx->Extensions.OES_EGL_image = GL_TRUE;
 328    if (ctx->API != API_OPENGL)
 329       ctx->Extensions.OES_EGL_image_external = GL_TRUE;
 330 #endif
 331 #if FEATURE_OES_draw_texture
 332    ctx->Extensions.OES_draw_texture = GL_TRUE;
 333 #endif
 334
 335    /*
 336     * Extensions that depend on the driver/hardware:
 337     */
 338    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SWIZZLE) > 0) {
 339       ctx->Extensions.EXT_texture_swizzle = GL_TRUE;
 340    }
 341
 342    if (screen->get_param(screen, PIPE_CAP_BLEND_EQUATION_SEPARATE)) {
 343       ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
 344    }
 345
 346    if (screen->get_param(screen, PIPE_CAP_TEXTURE_MIRROR_CLAMP) > 0) {
 347       ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
 348       ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
 349    }
 350
 351    if (screen->get_param(screen, PIPE_CAP_NPOT_TEXTURES)) {
 352       ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
 353    }
 354
 355    if (screen->get_param(screen, PIPE_CAP_TWO_SIDED_STENCIL)) {
 356       ctx->Extensions.ATI_separate_stencil = GL_TRUE;
 357       ctx->Extensions.EXT_stencil_two_side = GL_TRUE;
 358    }
 359
 360    if (screen->get_param(screen, PIPE_CAP_ANISOTROPIC_FILTER)) {
 361       ctx->Extensions.EXT_texture_filter_anisotropic = GL_TRUE;
 362    }
 363
 364    if (screen->get_param(screen, PIPE_CAP_POINT_SPRITE)) {
 365       ctx->Extensions.ARB_point_sprite = GL_TRUE;
 366       /* GL_NV_point_sprite is not supported by gallium because we don't
 367        * support the GL_POINT_SPRITE_R_MODE_NV option.
 368        */
 369    }
 370
 371    if (screen->get_param(screen, PIPE_CAP_OCCLUSION_QUERY)) {
 372       ctx->Extensions.ARB_occlusion_query = GL_TRUE;
 373       ctx->Extensions.ARB_occlusion_query2 = GL_TRUE;
 374    }
 375    if (screen->get_param(screen, PIPE_CAP_TIMER_QUERY)) {
 376       ctx->Extensions.EXT_timer_query = GL_TRUE;
 377    }
 378
 379    if (screen->get_param(screen, PIPE_CAP_TEXTURE_SHADOW_MAP)) {
 380       ctx->Extensions.ARB_depth_texture = GL_TRUE;
 381       ctx->Extensions.ARB_fragment_program_shadow = GL_TRUE;
 382       ctx->Extensions.ARB_shadow = GL_TRUE;
 383       ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
 384       /*ctx->Extensions.ARB_shadow_ambient = GL_TRUE;*/
 385    }
 386
 387    /* GL_EXT_packed_depth_stencil requires both the ability to render to
 388     * a depth/stencil buffer and texture from depth/stencil source.
 389     */
 390    if (screen->is_format_supported(screen, PIPE_FORMAT_S8_UINT_Z24_UNORM,
 391                                    PIPE_TEXTURE_2D, 0,
 392                                    PIPE_BIND_DEPTH_STENCIL) &&
 393        screen->is_format_supported(screen, PIPE_FORMAT_S8_UINT_Z24_UNORM,
 394                                    PIPE_TEXTURE_2D, 0,
 395                                    PIPE_BIND_SAMPLER_VIEW)) {
 396       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 397    }
 398    else if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_UINT,
 399                                         PIPE_TEXTURE_2D, 0,
 400                                         PIPE_BIND_DEPTH_STENCIL) &&
 401             screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_UINT,
 402                                         PIPE_TEXTURE_2D, 0,
 403                                         PIPE_BIND_SAMPLER_VIEW)) {
 404       ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
 405    }
 406
 407    /* float support - assume nothing exclusively supports 64-bit floats */
 408    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 409                                    PIPE_TEXTURE_2D, 0,
 410                                    PIPE_BIND_SAMPLER_VIEW |
 411                                    PIPE_BIND_RENDER_TARGET) &&
 412       screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 413                                    PIPE_TEXTURE_2D, 0,
 414                                    PIPE_BIND_SAMPLER_VIEW |
 415                                    PIPE_BIND_RENDER_TARGET)) {
 416       ctx->Extensions.ARB_texture_float = GL_TRUE;
 417    }
 418
 419    /* sRGB support */
 420    if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 421                                    PIPE_TEXTURE_2D, 0,
 422                                    PIPE_BIND_SAMPLER_VIEW) ||
 423       screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 424                                    PIPE_TEXTURE_2D, 0,
 425                                    PIPE_BIND_SAMPLER_VIEW)) {
 426       ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
 427       ctx->Extensions.EXT_texture_sRGB_decode = GL_TRUE;
 428       if (screen->is_format_supported(screen, PIPE_FORMAT_A8B8G8R8_SRGB,
 429                                    PIPE_TEXTURE_2D, 0,
 430                                    PIPE_BIND_RENDER_TARGET) ||
 431           screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_SRGB,
 432                                    PIPE_TEXTURE_2D, 0,
 433                                    PIPE_BIND_RENDER_TARGET)) {
 434          ctx->Extensions.EXT_framebuffer_sRGB = GL_TRUE;
 435          ctx->Const.sRGBCapable = GL_TRUE;
 436       }
 437    }
 438
 439    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM,
 440                                    PIPE_TEXTURE_2D, 0,
 441                                    PIPE_BIND_SAMPLER_VIEW)) {
 442       ctx->Extensions.ARB_texture_rg = GL_TRUE;
 443    }
 444
 445    /* s3tc support */
 446    if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 447                                    PIPE_TEXTURE_2D, 0,
 448                                    PIPE_BIND_SAMPLER_VIEW) &&
 449        (ctx->Mesa_DXTn || st_get_s3tc_override())) {
 450       ctx->Extensions.EXT_texture_compression_s3tc = GL_TRUE;
 451       ctx->Extensions.S3_s3tc = GL_TRUE;
 452    }
 453
 454    if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM,
 455                                    PIPE_TEXTURE_2D, 0,
 456                                    PIPE_BIND_SAMPLER_VIEW) &&
 457        screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM,
 458                                    PIPE_TEXTURE_2D, 0,
 459                                    PIPE_BIND_SAMPLER_VIEW) &&
 460        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM,
 461                                    PIPE_TEXTURE_2D, 0,
 462                                    PIPE_BIND_SAMPLER_VIEW) &&
 463        screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM,
 464                                    PIPE_TEXTURE_2D, 0,
 465                                    PIPE_BIND_SAMPLER_VIEW)
 466        ) {
 467      ctx->Extensions.ARB_texture_compression_rgtc = GL_TRUE;
 468    }
 469
 470    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM,
 471                                    PIPE_TEXTURE_2D, 0,
 472                                    PIPE_BIND_SAMPLER_VIEW) &&
 473        screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM,
 474                                    PIPE_TEXTURE_2D, 0,
 475                                    PIPE_BIND_SAMPLER_VIEW) &&
 476        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 477                                    PIPE_TEXTURE_2D, 0,
 478                                    PIPE_BIND_SAMPLER_VIEW) &&
 479        screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM,
 480                                    PIPE_TEXTURE_2D, 0,
 481                                    PIPE_BIND_SAMPLER_VIEW)) {
 482       ctx->Extensions.EXT_texture_compression_latc = GL_TRUE;
 483    }
 484
 485    if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM,
 486                                    PIPE_TEXTURE_2D, 0,
 487                                    PIPE_BIND_SAMPLER_VIEW)) {
 488       ctx->Extensions.ATI_texture_compression_3dc = GL_TRUE;
 489    }
 490
 491    if (ctx->API != API_OPENGL) {
 492       if (screen->is_format_supported(screen, PIPE_FORMAT_ETC1_RGB8,
 493                                       PIPE_TEXTURE_2D, 0,
 494                                       PIPE_BIND_SAMPLER_VIEW)) {
 495          ctx->Extensions.OES_compressed_ETC1_RGB8_texture = GL_TRUE;
 496       }
 497    }
 498
 499    if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 500                                    PIPE_TEXTURE_2D, 0,
 501                                    PIPE_BIND_SAMPLER_VIEW)) {
 502       ctx->Extensions.EXT_texture_snorm = GL_TRUE;
 503    }
 504
 505    /* ycbcr support */
 506    if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 507                                    PIPE_TEXTURE_2D, 0,
 508                                    PIPE_BIND_SAMPLER_VIEW) ||
 509        screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 510                                    PIPE_TEXTURE_2D, 0,
 511                                    PIPE_BIND_SAMPLER_VIEW)) {
 512       ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
 513    }
 514
 515    /* GL_EXT_texture_array */
 516    if (screen->get_param(screen, PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS) > 1) {
 517       ctx->Extensions.EXT_texture_array = GL_TRUE;
 518       ctx->Extensions.MESA_texture_array = GL_TRUE;
 519    }
 520
 521    /* GL_ARB_framebuffer_object */
 522    if (ctx->Extensions.EXT_packed_depth_stencil) {
 523       /* we support always support GL_EXT_framebuffer_blit */
 524       ctx->Extensions.ARB_framebuffer_object = GL_TRUE;
 525    }
 526
 527    if (screen->get_param(screen, PIPE_CAP_CONDITIONAL_RENDER)) {
 528       ctx->Extensions.NV_conditional_render = GL_TRUE;
 529    }
 530
 531    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_ENABLE)) {
 532       ctx->Extensions.EXT_draw_buffers2 = GL_TRUE;
 533    }
 534
 535    if (screen->get_param(screen, PIPE_CAP_INDEP_BLEND_FUNC)) {
 536       ctx->Extensions.ARB_draw_buffers_blend = GL_TRUE;
 537    }
 538
 539    /* GL_ARB_half_float_vertex */
 540    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 541                                    PIPE_BUFFER, 0,
 542                                    PIPE_BIND_VERTEX_BUFFER)) {
 543       ctx->Extensions.ARB_half_float_vertex = GL_TRUE;
 544    }
 545
 546    if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FIXED,
 547                                    PIPE_BUFFER, 0,
 548                                    PIPE_BIND_VERTEX_BUFFER)) {
 549       ctx->Extensions.ARB_ES2_compatibility = GL_TRUE;
 550    }
 551
 552    if (screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_UNORM,
 553                                    PIPE_BUFFER, 0,
 554                                    PIPE_BIND_VERTEX_BUFFER) &&
 555        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UNORM,
 556                                    PIPE_BUFFER, 0,
 557                                    PIPE_BIND_VERTEX_BUFFER) &&
 558        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SNORM,
 559                                    PIPE_BUFFER, 0,
 560                                    PIPE_BIND_VERTEX_BUFFER) &&
 561        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SNORM,
 562                                    PIPE_BUFFER, 0,
 563                                    PIPE_BIND_VERTEX_BUFFER) &&
 564        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_USCALED,
 565                                    PIPE_BUFFER, 0,
 566                                    PIPE_BIND_VERTEX_BUFFER) &&
 567        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_USCALED,
 568                                    PIPE_BUFFER, 0,
 569                                    PIPE_BIND_VERTEX_BUFFER) &&
 570        screen->is_format_supported(screen, PIPE_FORMAT_R10G10B10A2_SSCALED,
 571                                    PIPE_BUFFER, 0,
 572                                    PIPE_BIND_VERTEX_BUFFER) &&
 573        screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_SSCALED,
 574                                    PIPE_BUFFER, 0,
 575                                    PIPE_BIND_VERTEX_BUFFER)) {
 576       ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = GL_TRUE;
 577    }
 578
 579    if (screen->get_shader_param(screen, PIPE_SHADER_GEOMETRY,
 580                                 PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0) {
 581 #if 0 /* XXX re-enable when GLSL compiler again supports geometry shaders */
 582       ctx->Extensions.ARB_geometry_shader4 = GL_TRUE;
 583 #endif
 584    }
 585
 586    if (screen->get_shader_param(screen, PIPE_SHADER_VERTEX,
 587                                 PIPE_SHADER_CAP_INTEGERS) &&
 588        screen->get_shader_param(screen, PIPE_SHADER_FRAGMENT,
 589                                 PIPE_SHADER_CAP_INTEGERS)) {
 590       ctx->Const.NativeIntegers = GL_TRUE;
 591    }
 592
 593    if (ctx->Const.NativeIntegers)
 594       ctx->Const.GLSLVersion = 130;
 595
 596    /* Extensions that only depend on the GLSL version:
 597     */
 598    if (ctx->Const.GLSLVersion >= 130) {
 599       ctx->Extensions.ARB_conservative_depth = GL_TRUE;
 600       ctx->Const.MaxClipPlanes = 8;
 601    }
 602
 603    ctx->Extensions.NV_primitive_restart = GL_TRUE;
 604    if (!screen->get_param(screen, PIPE_CAP_PRIMITIVE_RESTART)) {
 605       st->sw_primitive_restart = GL_TRUE;
 606    }
 607
 608    if (screen->get_param(screen, PIPE_CAP_DEPTH_CLIP_DISABLE)) {
 609       ctx->Extensions.ARB_depth_clamp = GL_TRUE;
 610    }
 611
 612    /* This extension does not actually require support of floating point
 613     * render targets, just clamping controls.
 614     * Advertise this extension if either fragment color clamping is supported
 615     * or no render targets having color values outside of the range [0, 1]
 616     * are supported, in which case the fragment color clamping has no effect
 617     * on rendering.
 618     */
 619    if (screen->get_param(screen, PIPE_CAP_FRAGMENT_COLOR_CLAMP_CONTROL) ||
 620        (!screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
 621                                      PIPE_TEXTURE_2D, 0,
 622                                      PIPE_BIND_RENDER_TARGET) &&
 623         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM,
 624                                      PIPE_TEXTURE_2D, 0,
 625                                      PIPE_BIND_RENDER_TARGET) &&
 626         !screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_FLOAT,
 627                                      PIPE_TEXTURE_2D, 0,
 628                                      PIPE_BIND_RENDER_TARGET) &&
 629         !screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_FLOAT,
 630                                      PIPE_TEXTURE_2D, 0,
 631                                      PIPE_BIND_RENDER_TARGET) &&
 632         !screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 633                                      PIPE_TEXTURE_2D, 0,
 634                                      PIPE_BIND_RENDER_TARGET) &&
 635         !screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 636                                      PIPE_TEXTURE_2D, 0,
 637                                      PIPE_BIND_RENDER_TARGET))) {
 638       ctx->Extensions.ARB_color_buffer_float = GL_TRUE;
 639    }
 640
 641    if (screen->get_param(screen, PIPE_CAP_SHADER_STENCIL_EXPORT)) {
 642       ctx->Extensions.ARB_shader_stencil_export = GL_TRUE;
 643    }
 644
 645    if (screen->get_param(screen, PIPE_CAP_TGSI_INSTANCEID)) {
 646       ctx->Extensions.ARB_draw_instanced = GL_TRUE;
 647    }
 648    if (screen->get_param(screen, PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR)) {
 649       ctx->Extensions.ARB_instanced_arrays = GL_TRUE;
 650    }
 651
 652    if (screen->fence_finish) {
 653       ctx->Extensions.ARB_sync = GL_TRUE;
 654    }
 655
 656    if (screen->get_param(screen, PIPE_CAP_TEXTURE_BARRIER)) {
 657       ctx->Extensions.NV_texture_barrier = GL_TRUE;
 658    }
 659
 660    if (screen->is_format_supported(screen, PIPE_FORMAT_R9G9B9E5_FLOAT,
 661                                    PIPE_TEXTURE_2D, 0,
 662                                    PIPE_BIND_SAMPLER_VIEW)) {
 663       ctx->Extensions.EXT_texture_shared_exponent = GL_TRUE;
 664    }
 665
 666    if (screen->is_format_supported(screen, PIPE_FORMAT_R11G11B10_FLOAT,
 667                                    PIPE_TEXTURE_2D, 0,
 668                                    PIPE_BIND_RENDER_TARGET |
 669                                    PIPE_BIND_SAMPLER_VIEW)) {
 670       ctx->Extensions.EXT_packed_float = GL_TRUE;
 671    }
 672
 673    /* Maximum sample count. */
 674    for (i = 16; i > 0; --i) {
 675       if (screen->is_format_supported(screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 676                                       PIPE_TEXTURE_2D, i,
 677                                       PIPE_BIND_RENDER_TARGET)) {
 678          ctx->Const.MaxSamples = i;
 679          break;
 680       }
 681    }
 682
 683    if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE)) {
 684       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 685       ctx->Extensions.AMD_seamless_cubemap_per_texture = GL_TRUE;
 686    }
 687    else if (screen->get_param(screen, PIPE_CAP_SEAMLESS_CUBE_MAP)) {
 688       ctx->Extensions.ARB_seamless_cube_map = GL_TRUE;
 689    }
 690
 691    if (screen->get_param(screen, PIPE_CAP_SM3)) {
 692       ctx->Extensions.ARB_shader_texture_lod = GL_TRUE;
 693    }
 694
 695    if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT,
 696                                    PIPE_TEXTURE_2D, 0,
 697                                    PIPE_BIND_DEPTH_STENCIL |
 698                                    PIPE_BIND_SAMPLER_VIEW) &&
 699        screen->is_format_supported(screen, PIPE_FORMAT_Z32_FLOAT_S8X24_UINT,
 700                                    PIPE_TEXTURE_2D, 0,
 701                                    PIPE_BIND_DEPTH_STENCIL |
 702                                    PIPE_BIND_SAMPLER_VIEW)) {
 703       ctx->Extensions.ARB_depth_buffer_float = GL_TRUE;
 704    }
 705
 706    if (screen->is_format_supported(screen, PIPE_FORMAT_B10G10R10A2_UINT,
 707                                    PIPE_TEXTURE_2D, 0,
 708                                    PIPE_BIND_SAMPLER_VIEW))
 709        ctx->Extensions.ARB_texture_rgb10_a2ui = GL_TRUE;
 710
 711    if (screen->get_param(screen, PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS) != 0) {
 712       ctx->Extensions.EXT_transform_feedback = GL_TRUE;
 713
 714       if (screen->get_param(screen,
 715                             PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME) != 0) {
 716          ctx->Extensions.ARB_transform_feedback2 = GL_TRUE;
 717       }
 718    }
 719
 720    if (ctx->Const.NativeIntegers &&
 721        screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_UINT, PIPE_TEXTURE_2D, 0,
 722                                    PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_RENDER_TARGET) &&
 723        screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_SINT, PIPE_TEXTURE_2D, 0,
 724                                    PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_RENDER_TARGET))
 725       ctx->Extensions.EXT_texture_integer = GL_TRUE;
 726
 727 }