src/mesa/main/state.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.3
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   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 "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file state.c
  28  * State management.
  29  *
  30  * This file manages recalculation of derived values in struct gl_context.
  31  */
  32
  33
  34 #include "glheader.h"
  35 #include "mtypes.h"
  36 #include "context.h"
  37 #include "debug.h"
  38 #include "macros.h"
  39 #include "ffvertex_prog.h"
  40 #include "framebuffer.h"
  41 #include "light.h"
  42 #include "matrix.h"
  43 #include "pixel.h"
  44 #include "program/program.h"
  45 #include "program/prog_parameter.h"
  46 #include "state.h"
  47 #include "stencil.h"
  48 #include "texenvprogram.h"
  49 #include "texobj.h"
  50 #include "texstate.h"
  51 #include "varray.h"
  52
  53
  54 static void
  55 update_separate_specular(struct gl_context *ctx)
  56 {
  57    if (_mesa_need_secondary_color(ctx))
  58       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  59    else
  60       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  61 }
  62
  63
  64 /**
  65  * Helper for update_arrays().
  66  * \return  min(current min, array->_MaxElement).
  67  */
  68 static GLuint
  69 update_min(GLuint min, struct gl_client_array *array)
  70 {
  71    _mesa_update_array_max_element(array);
  72    return MIN2(min, array->_MaxElement);
  73 }
  74
  75
  76 /**
  77  * Update ctx->Array._MaxElement (the max legal index into all enabled arrays).
  78  * Need to do this upon new array state or new buffer object state.
  79  */
  80 static void
  81 update_arrays( struct gl_context *ctx )
  82 {
  83    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
  84    GLuint i, min = ~0;
  85
  86    /* find min of _MaxElement values for all enabled arrays.
  87     * Note that the generic arrays always take precedence over
  88     * the legacy arrays.
  89     */
  90
  91    /* 0 */
  92    if (ctx->VertexProgram._Current
  93        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC0].Enabled) {
  94       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC0]);
  95    }
  96    else if (arrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
  97       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_POS]);
  98    }
  99
 100    /* 1 */
 101    if (ctx->VertexProgram._Enabled
 102        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC1].Enabled) {
 103       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC1]);
 104    }
 105    /* no conventional vertex weight array */
 106
 107    /* 2 */
 108    if (ctx->VertexProgram._Enabled
 109        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC2].Enabled) {
 110       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC2]);
 111    }
 112    else if (arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
 113       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]);
 114    }
 115
 116    /* 3 */
 117    if (ctx->VertexProgram._Enabled
 118        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC3].Enabled) {
 119       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC3]);
 120    }
 121    else if (arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 122       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]);
 123    }
 124
 125    /* 4 */
 126    if (ctx->VertexProgram._Enabled
 127        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC4].Enabled) {
 128       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC4]);
 129    }
 130    else if (arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 131       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]);
 132    }
 133
 134    /* 5 */
 135    if (ctx->VertexProgram._Enabled
 136        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC5].Enabled) {
 137       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC5]);
 138    }
 139    else if (arrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 140       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_FOG]);
 141    }
 142
 143    /* 6 */
 144    if (ctx->VertexProgram._Enabled
 145        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC6].Enabled) {
 146       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC6]);
 147    }
 148    else if (arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 149       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]);
 150    }
 151
 152    /* 7 */
 153    if (ctx->VertexProgram._Enabled
 154        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC7].Enabled) {
 155       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC7]);
 156    }
 157
 158    /* 8..15 */
 159    for (i = 0; i < VERT_ATTRIB_TEX_MAX; i++) {
 160       if (ctx->VertexProgram._Enabled
 161           && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC8 + i].Enabled) {
 162          min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC8 + i]);
 163       }
 164       else if (i < ctx->Const.MaxTextureCoordUnits
 165                && arrayObj->VertexAttrib[VERT_ATTRIB_TEX(i)].Enabled) {
 166          min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_TEX(i)]);
 167       }
 168    }
 169
 170    /* 16..31 */
 171    if (ctx->VertexProgram._Current) {
 172       for (i = 0; i < VERT_ATTRIB_GENERIC_MAX; i++) {
 173          if (arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC(i)].Enabled) {
 174             min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC(i)]);
 175          }
 176       }
 177    }
 178
 179    if (arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 180       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]);
 181    }
 182
 183    /* _MaxElement is one past the last legal array element */
 184    arrayObj->_MaxElement = min;
 185 }
 186
 187
 188 /**
 189  * Update the following fields:
 190  *   ctx->VertexProgram._Enabled
 191  *   ctx->FragmentProgram._Enabled
 192  *   ctx->ATIFragmentShader._Enabled
 193  * This needs to be done before texture state validation.
 194  */
 195 static void
 196 update_program_enables(struct gl_context *ctx)
 197 {
 198    /* These _Enabled flags indicate if the user-defined ARB/NV vertex/fragment
 199     * program is enabled AND valid.  Similarly for ATI fragment shaders.
 200     * GLSL shaders not relevant here.
 201     */
 202    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 203       && ctx->VertexProgram.Current->Base.Instructions;
 204    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 205       && ctx->FragmentProgram.Current->Base.Instructions;
 206    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
 207       && ctx->ATIFragmentShader.Current->Instructions[0];
 208 }
 209
 210
 211 /**
 212  * Update the ctx->Vertex/Geometry/FragmentProgram._Current pointers to point
 213  * to the current/active programs.  Then call ctx->Driver.BindProgram() to
 214  * tell the driver which programs to use.
 215  *
 216  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
 217  * programs or programs derived from fixed-function state.
 218  *
 219  * This function needs to be called after texture state validation in case
 220  * we're generating a fragment program from fixed-function texture state.
 221  *
 222  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 223  * or fragment program is being used.
 224  */
 225 static GLbitfield
 226 update_program(struct gl_context *ctx)
 227 {
 228    const struct gl_shader_program *vsProg = ctx->Shader.CurrentVertexProgram;
 229    const struct gl_shader_program *gsProg = ctx->Shader.CurrentGeometryProgram;
 230    const struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;
 231    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 232    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 233    const struct gl_geometry_program *prevGP = ctx->GeometryProgram._Current;
 234    GLbitfield new_state = 0x0;
 235
 236    /*
 237     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 238     * pointers to the programs that should be used for rendering.  If either
 239     * is NULL, use fixed-function code paths.
 240     *
 241     * These programs may come from several sources.  The priority is as
 242     * follows:
 243     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 244     *   2. ARB/NV vertex/fragment programs
 245     *   3. Programs derived from fixed-function state.
 246     *
 247     * Note: it's possible for a vertex shader to get used with a fragment
 248     * program (and vice versa) here, but in practice that shouldn't ever
 249     * come up, or matter.
 250     */
 251
 252    if (fsProg && fsProg->LinkStatus
 253        && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {
 254       /* Use GLSL fragment shader */
 255       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 256                                (struct gl_fragment_program *)
 257                                fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 258    }
 259    else if (ctx->FragmentProgram._Enabled) {
 260       /* Use user-defined fragment program */
 261       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 262                                ctx->FragmentProgram.Current);
 263    }
 264    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 265       /* Use fragment program generated from fixed-function state */
 266       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 267
 268       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 269                                (struct gl_fragment_program *)
 270                                f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 271    }
 272    else {
 273       /* No fragment program */
 274       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 275    }
 276
 277    if (gsProg && gsProg->LinkStatus
 278        && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {
 279       /* Use GLSL geometry shader */
 280       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 281                                (struct gl_geometry_program *)
 282                                gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program);
 283    } else {
 284       /* No geometry program */
 285       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 286    }
 287
 288    /* Examine vertex program after fragment program as
 289     * _mesa_get_fixed_func_vertex_program() needs to know active
 290     * fragprog inputs.
 291     */
 292    if (vsProg && vsProg->LinkStatus
 293        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 294       /* Use GLSL vertex shader */
 295       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 296                                (struct gl_vertex_program *)
 297                                vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program);
 298    }
 299    else if (ctx->VertexProgram._Enabled) {
 300       /* Use user-defined vertex program */
 301       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 302                                ctx->VertexProgram.Current);
 303    }
 304    else if (ctx->VertexProgram._MaintainTnlProgram) {
 305       /* Use vertex program generated from fixed-function state */
 306       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 307                                _mesa_get_fixed_func_vertex_program(ctx));
 308       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 309                                ctx->VertexProgram._Current);
 310    }
 311    else {
 312       /* no vertex program */
 313       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 314    }
 315
 316    /* Let the driver know what's happening:
 317     */
 318    if (ctx->FragmentProgram._Current != prevFP) {
 319       new_state |= _NEW_PROGRAM;
 320       if (ctx->Driver.BindProgram) {
 321          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 322                           (struct gl_program *) ctx->FragmentProgram._Current);
 323       }
 324    }
 325
 326    if (ctx->GeometryProgram._Current != prevGP) {
 327       new_state |= _NEW_PROGRAM;
 328       if (ctx->Driver.BindProgram) {
 329          ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,
 330                             (struct gl_program *) ctx->GeometryProgram._Current);
 331       }
 332    }
 333
 334    if (ctx->VertexProgram._Current != prevVP) {
 335       new_state |= _NEW_PROGRAM;
 336       if (ctx->Driver.BindProgram) {
 337          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 338                             (struct gl_program *) ctx->VertexProgram._Current);
 339       }
 340    }
 341
 342    return new_state;
 343 }
 344
 345
 346 /**
 347  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 348  */
 349 static GLbitfield
 350 update_program_constants(struct gl_context *ctx)
 351 {
 352    GLbitfield new_state = 0x0;
 353
 354    if (ctx->FragmentProgram._Current) {
 355       const struct gl_program_parameter_list *params =
 356          ctx->FragmentProgram._Current->Base.Parameters;
 357       if (params && params->StateFlags & ctx->NewState) {
 358          new_state |= _NEW_PROGRAM_CONSTANTS;
 359       }
 360    }
 361
 362    if (ctx->GeometryProgram._Current) {
 363       const struct gl_program_parameter_list *params =
 364          ctx->GeometryProgram._Current->Base.Parameters;
 365       /*FIXME: StateFlags is always 0 because we have unnamed constant
 366        *       not state changes */
 367       if (params /*&& params->StateFlags & ctx->NewState*/) {
 368          new_state |= _NEW_PROGRAM_CONSTANTS;
 369       }
 370    }
 371
 372    if (ctx->VertexProgram._Current) {
 373       const struct gl_program_parameter_list *params =
 374          ctx->VertexProgram._Current->Base.Parameters;
 375       if (params && params->StateFlags & ctx->NewState) {
 376          new_state |= _NEW_PROGRAM_CONSTANTS;
 377       }
 378    }
 379
 380    return new_state;
 381 }
 382
 383
 384
 385
 386 static void
 387 update_viewport_matrix(struct gl_context *ctx)
 388 {
 389    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 390
 391    ASSERT(depthMax > 0);
 392
 393    /* Compute scale and bias values. This is really driver-specific
 394     * and should be maintained elsewhere if at all.
 395     * NOTE: RasterPos uses this.
 396     */
 397    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 398                          ctx->Viewport.X, ctx->Viewport.Y,
 399                          ctx->Viewport.Width, ctx->Viewport.Height,
 400                          ctx->Viewport.Near, ctx->Viewport.Far,
 401                          depthMax);
 402 }
 403
 404
 405 /**
 406  * Update derived multisample state.
 407  */
 408 static void
 409 update_multisample(struct gl_context *ctx)
 410 {
 411    ctx->Multisample._Enabled = GL_FALSE;
 412    if (ctx->Multisample.Enabled &&
 413        ctx->DrawBuffer &&
 414        ctx->DrawBuffer->Visual.sampleBuffers)
 415       ctx->Multisample._Enabled = GL_TRUE;
 416 }
 417
 418
 419 /**
 420  * Update the ctx->Color._ClampFragmentColor field
 421  */
 422 static void
 423 update_clamp_fragment_color(struct gl_context *ctx)
 424 {
 425    if (ctx->Color.ClampFragmentColor == GL_FIXED_ONLY_ARB)
 426       ctx->Color._ClampFragmentColor =
 427          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 428    else
 429       ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
 430 }
 431
 432
 433 /**
 434  * Update the ctx->Color._ClampVertexColor field
 435  */
 436 static void
 437 update_clamp_vertex_color(struct gl_context *ctx)
 438 {
 439    if (ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
 440       ctx->Light._ClampVertexColor =
 441          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 442    else
 443       ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
 444 }
 445
 446
 447 /**
 448  * Update the ctx->Color._ClampReadColor field
 449  */
 450 static void
 451 update_clamp_read_color(struct gl_context *ctx)
 452 {
 453    if (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
 454       ctx->Color._ClampReadColor =
 455          !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
 456    else
 457       ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
 458 }
 459
 460 /**
 461  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 462  */
 463 static void
 464 update_twoside(struct gl_context *ctx)
 465 {
 466    if (ctx->Shader.CurrentVertexProgram ||
 467        ctx->VertexProgram._Enabled) {
 468       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 469    } else {
 470       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 471                                             ctx->Light.Model.TwoSide);
 472    }
 473 }
 474
 475
 476 /*
 477  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 478  * in ctx->_TriangleCaps if needed.
 479  */
 480 static void
 481 update_polygon(struct gl_context *ctx)
 482 {
 483    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 484
 485    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 486       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 487
 488    if (   ctx->Polygon.OffsetPoint
 489        || ctx->Polygon.OffsetLine
 490        || ctx->Polygon.OffsetFill)
 491       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 492 }
 493
 494
 495 /**
 496  * Update the ctx->_TriangleCaps bitfield.
 497  * XXX that bitfield should really go away someday!
 498  * This function must be called after other update_*() functions since
 499  * there are dependencies on some other derived values.
 500  */
 501 #if 0
 502 static void
 503 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 504 {
 505    ctx->_TriangleCaps = 0;
 506
 507    /*
 508     * Points
 509     */
 510    if (1/*new_state & _NEW_POINT*/) {
 511       if (ctx->Point.SmoothFlag)
 512          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 513       if (ctx->Point._Attenuated)
 514          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 515    }
 516
 517    /*
 518     * Lines
 519     */
 520    if (1/*new_state & _NEW_LINE*/) {
 521       if (ctx->Line.SmoothFlag)
 522          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 523       if (ctx->Line.StippleFlag)
 524          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 525    }
 526
 527    /*
 528     * Polygons
 529     */
 530    if (1/*new_state & _NEW_POLYGON*/) {
 531       if (ctx->Polygon.SmoothFlag)
 532          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 533       if (ctx->Polygon.StippleFlag)
 534          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 535       if (ctx->Polygon.FrontMode != GL_FILL
 536           || ctx->Polygon.BackMode != GL_FILL)
 537          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 538       if (ctx->Polygon.CullFlag
 539           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 540          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 541       if (ctx->Polygon.OffsetPoint ||
 542           ctx->Polygon.OffsetLine ||
 543           ctx->Polygon.OffsetFill)
 544          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 545    }
 546
 547    /*
 548     * Lighting and shading
 549     */
 550    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 551       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 552    if (ctx->Light.ShadeModel == GL_FLAT)
 553       ctx->_TriangleCaps |= DD_FLATSHADE;
 554    if (_mesa_need_secondary_color(ctx))
 555       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 556
 557    /*
 558     * Stencil
 559     */
 560    if (ctx->Stencil._TestTwoSide)
 561       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 562 }
 563 #endif
 564
 565
 566 /**
 567  * Compute derived GL state.
 568  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 569  * be called before rendering anything.
 570  *
 571  * Calls dd_function_table::UpdateState to perform any internal state
 572  * management necessary.
 573  *
 574  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 575  * _mesa_update_buffer_bounds(),
 576  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 577  */
 578 void
 579 _mesa_update_state_locked( struct gl_context *ctx )
 580 {
 581    GLbitfield new_state = ctx->NewState;
 582    GLbitfield prog_flags = _NEW_PROGRAM;
 583    GLbitfield new_prog_state = 0x0;
 584
 585    if (new_state == _NEW_CURRENT_ATTRIB)
 586       goto out;
 587
 588    if (MESA_VERBOSE & VERBOSE_STATE)
 589       _mesa_print_state("_mesa_update_state", new_state);
 590
 591    /* Determine which state flags effect vertex/fragment program state */
 592    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 593       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 594                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 595                      _NEW_PROGRAM | _NEW_FRAG_CLAMP | _NEW_COLOR);
 596    }
 597    if (ctx->VertexProgram._MaintainTnlProgram) {
 598       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 599                      _NEW_TRANSFORM | _NEW_POINT |
 600                      _NEW_FOG | _NEW_LIGHT |
 601                      _MESA_NEW_NEED_EYE_COORDS);
 602    }
 603
 604    /*
 605     * Now update derived state info
 606     */
 607
 608    if (new_state & prog_flags)
 609       update_program_enables( ctx );
 610
 611    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 612       _mesa_update_modelview_project( ctx, new_state );
 613
 614    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 615       _mesa_update_texture( ctx, new_state );
 616
 617    if (new_state & _NEW_BUFFERS)
 618       _mesa_update_framebuffer(ctx);
 619
 620    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 621       _mesa_update_draw_buffer_bounds( ctx );
 622
 623    if (new_state & _NEW_POLYGON)
 624       update_polygon( ctx );
 625
 626    if (new_state & _NEW_LIGHT)
 627       _mesa_update_lighting( ctx );
 628
 629    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 630       update_twoside( ctx );
 631
 632    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 633       update_clamp_vertex_color(ctx);
 634
 635    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 636       _mesa_update_stencil( ctx );
 637
 638    if (new_state & _NEW_PIXEL)
 639       _mesa_update_pixel( ctx, new_state );
 640
 641    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 642       update_separate_specular( ctx );
 643
 644    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 645       update_viewport_matrix(ctx);
 646
 647    if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))
 648       update_multisample( ctx );
 649
 650    if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
 651       update_clamp_read_color(ctx);
 652
 653    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 654       update_clamp_fragment_color(ctx);
 655
 656 #if 0
 657    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 658                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 659       update_tricaps( ctx, new_state );
 660 #endif
 661
 662    /* ctx->_NeedEyeCoords is now up to date.
 663     *
 664     * If the truth value of this variable has changed, update for the
 665     * new lighting space and recompute the positions of lights and the
 666     * normal transform.
 667     *
 668     * If the lighting space hasn't changed, may still need to recompute
 669     * light positions & normal transforms for other reasons.
 670     */
 671    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 672       _mesa_update_tnl_spaces( ctx, new_state );
 673
 674    if (new_state & prog_flags) {
 675       /* When we generate programs from fixed-function vertex/fragment state
 676        * this call may generate/bind a new program.  If so, we need to
 677        * propogate the _NEW_PROGRAM flag to the driver.
 678        */
 679       new_prog_state |= update_program( ctx );
 680    }
 681
 682    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 683       update_arrays( ctx );
 684
 685  out:
 686    new_prog_state |= update_program_constants(ctx);
 687
 688    /*
 689     * Give the driver a chance to act upon the new_state flags.
 690     * The driver might plug in different span functions, for example.
 691     * Also, this is where the driver can invalidate the state of any
 692     * active modules (such as swrast_setup, swrast, tnl, etc).
 693     *
 694     * Set ctx->NewState to zero to avoid recursion if
 695     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 696     */
 697    new_state = ctx->NewState | new_prog_state;
 698    ctx->NewState = 0;
 699    ctx->Driver.UpdateState(ctx, new_state);
 700    ctx->Array.NewState = 0;
 701    if (!ctx->Array.RebindArrays)
 702       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 703 }
 704
 705
 706 /* This is the usual entrypoint for state updates:
 707  */
 708 void
 709 _mesa_update_state( struct gl_context *ctx )
 710 {
 711    _mesa_lock_context_textures(ctx);
 712    _mesa_update_state_locked(ctx);
 713    _mesa_unlock_context_textures(ctx);
 714 }
 715
 716
 717
 718
 719 /**
 720  * Want to figure out which fragment program inputs are actually
 721  * constant/current values from ctx->Current.  These should be
 722  * referenced as a tracked state variable rather than a fragment
 723  * program input, to save the overhead of putting a constant value in
 724  * every submitted vertex, transferring it to hardware, interpolating
 725  * it across the triangle, etc...
 726  *
 727  * When there is a VP bound, just use vp->outputs.  But when we're
 728  * generating vp from fixed function state, basically want to
 729  * calculate:
 730  *
 731  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 732  *                 potential_vp_outputs )
 733  *
 734  * Where potential_vp_outputs is calculated by looking at enabled
 735  * texgen, etc.
 736  *
 737  * The generated fragment program should then only declare inputs that
 738  * may vary or otherwise differ from the ctx->Current values.
 739  * Otherwise, the fp should track them as state values instead.
 740  */
 741 void
 742 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 743                              GLbitfield64 varying_inputs )
 744 {
 745    if (ctx->varying_vp_inputs != varying_inputs) {
 746       ctx->varying_vp_inputs = varying_inputs;
 747       ctx->NewState |= _NEW_ARRAY;
 748       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 749    }
 750 }
 751
 752
 753 /**
 754  * Used by drivers to tell core Mesa that the driver is going to
 755  * install/ use its own vertex program.  In particular, this will
 756  * prevent generated fragment programs from using state vars instead
 757  * of ordinary varyings/inputs.
 758  */
 759 void
 760 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 761 {
 762    if (ctx->VertexProgram._Overriden != flag) {
 763       ctx->VertexProgram._Overriden = flag;
 764
 765       /* Set one of the bits which will trigger fragment program
 766        * regeneration:
 767        */
 768       ctx->NewState |= _NEW_PROGRAM;
 769    }
 770 }