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 GLcontext.
  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
  52
  53 static void
  54 update_separate_specular(GLcontext *ctx)
  55 {
  56    if (NEED_SECONDARY_COLOR(ctx))
  57       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  58    else
  59       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  60 }
  61
  62
  63 /**
  64  * Compute the index of the last array element that can be safely accessed
  65  * in a vertex array.  We can really only do this when the array lives in
  66  * a VBO.
  67  * The array->_MaxElement field will be updated.
  68  * Later in glDrawArrays/Elements/etc we can do some bounds checking.
  69  */
  70 static void
  71 compute_max_element(struct gl_client_array *array)
  72 {
  73    assert(array->Enabled);
  74    if (array->BufferObj->Name) {
  75       GLsizeiptrARB offset = (GLsizeiptrARB) array->Ptr;
  76       GLsizeiptrARB obj_size = (GLsizeiptrARB) array->BufferObj->Size;
  77
  78       if (offset < obj_size) {
  79          array->_MaxElement = (obj_size - offset +
  80                                array->StrideB -
  81                                array->_ElementSize) / array->StrideB;
  82       } else {
  83          array->_MaxElement = 0;
  84       }
  85    }
  86    else {
  87       /* user-space array, no idea how big it is */
  88       array->_MaxElement = 2 * 1000 * 1000 * 1000; /* just a big number */
  89    }
  90 }
  91
  92
  93 /**
  94  * Helper for update_arrays().
  95  * \return  min(current min, array->_MaxElement).
  96  */
  97 static GLuint
  98 update_min(GLuint min, struct gl_client_array *array)
  99 {
 100    compute_max_element(array);
 101    return MIN2(min, array->_MaxElement);
 102 }
 103
 104
 105 /**
 106  * Update ctx->Array._MaxElement (the max legal index into all enabled arrays).
 107  * Need to do this upon new array state or new buffer object state.
 108  */
 109 static void
 110 update_arrays( GLcontext *ctx )
 111 {
 112    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
 113    GLuint i, min = ~0;
 114
 115    /* find min of _MaxElement values for all enabled arrays */
 116
 117    /* 0 */
 118    if (ctx->VertexProgram._Current
 119        && arrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
 120       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_POS]);
 121    }
 122    else if (arrayObj->Vertex.Enabled) {
 123       min = update_min(min, &arrayObj->Vertex);
 124    }
 125
 126    /* 1 */
 127    if (ctx->VertexProgram._Enabled
 128        && arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT].Enabled) {
 129       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT]);
 130    }
 131    /* no conventional vertex weight array */
 132
 133    /* 2 */
 134    if (ctx->VertexProgram._Enabled
 135        && arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
 136       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]);
 137    }
 138    else if (arrayObj->Normal.Enabled) {
 139       min = update_min(min, &arrayObj->Normal);
 140    }
 141
 142    /* 3 */
 143    if (ctx->VertexProgram._Enabled
 144        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 145       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]);
 146    }
 147    else if (arrayObj->Color.Enabled) {
 148       min = update_min(min, &arrayObj->Color);
 149    }
 150
 151    /* 4 */
 152    if (ctx->VertexProgram._Enabled
 153        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 154       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]);
 155    }
 156    else if (arrayObj->SecondaryColor.Enabled) {
 157       min = update_min(min, &arrayObj->SecondaryColor);
 158    }
 159
 160    /* 5 */
 161    if (ctx->VertexProgram._Enabled
 162        && arrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 163       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_FOG]);
 164    }
 165    else if (arrayObj->FogCoord.Enabled) {
 166       min = update_min(min, &arrayObj->FogCoord);
 167    }
 168
 169    /* 6 */
 170    if (ctx->VertexProgram._Enabled
 171        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 172       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]);
 173    }
 174    else if (arrayObj->Index.Enabled) {
 175       min = update_min(min, &arrayObj->Index);
 176    }
 177
 178    /* 7 */
 179    if (ctx->VertexProgram._Enabled
 180        && arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 181       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]);
 182    }
 183
 184    /* 8..15 */
 185    for (i = VERT_ATTRIB_TEX0; i <= VERT_ATTRIB_TEX7; i++) {
 186       if (ctx->VertexProgram._Enabled
 187           && arrayObj->VertexAttrib[i].Enabled) {
 188          min = update_min(min, &arrayObj->VertexAttrib[i]);
 189       }
 190       else if (i - VERT_ATTRIB_TEX0 < ctx->Const.MaxTextureCoordUnits
 191                && arrayObj->TexCoord[i - VERT_ATTRIB_TEX0].Enabled) {
 192          min = update_min(min, &arrayObj->TexCoord[i - VERT_ATTRIB_TEX0]);
 193       }
 194    }
 195
 196    /* 16..31 */
 197    if (ctx->VertexProgram._Current) {
 198       for (i = 0; i < Elements(arrayObj->VertexAttrib); i++) {
 199          if (arrayObj->VertexAttrib[i].Enabled) {
 200             min = update_min(min, &arrayObj->VertexAttrib[i]);
 201          }
 202       }
 203    }
 204
 205    if (arrayObj->EdgeFlag.Enabled) {
 206       min = update_min(min, &arrayObj->EdgeFlag);
 207    }
 208
 209    /* _MaxElement is one past the last legal array element */
 210    arrayObj->_MaxElement = min;
 211 }
 212
 213
 214 /**
 215  * Update the following fields:
 216  *   ctx->VertexProgram._Enabled
 217  *   ctx->FragmentProgram._Enabled
 218  *   ctx->ATIFragmentShader._Enabled
 219  * This needs to be done before texture state validation.
 220  */
 221 static void
 222 update_program_enables(GLcontext *ctx)
 223 {
 224    /* These _Enabled flags indicate if the program is enabled AND valid. */
 225    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 226       && ctx->VertexProgram.Current->Base.Instructions;
 227    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 228       && ctx->FragmentProgram.Current->Base.Instructions;
 229    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
 230       && ctx->ATIFragmentShader.Current->Instructions[0];
 231 }
 232
 233
 234 /**
 235  * Update vertex/fragment program state.  In particular, update these fields:
 236  *   ctx->VertexProgram._Current
 237  *   ctx->VertexProgram._TnlProgram,
 238  * These point to the highest priority enabled vertex/fragment program or are
 239  * NULL if fixed-function processing is to be done.
 240  *
 241  * This function needs to be called after texture state validation in case
 242  * we're generating a fragment program from fixed-function texture state.
 243  *
 244  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 245  * or fragment program is being used.
 246  */
 247 static GLbitfield
 248 update_program(GLcontext *ctx)
 249 {
 250    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 251    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 252    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 253    GLbitfield new_state = 0x0;
 254
 255    /*
 256     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 257     * pointers to the programs that should be used for rendering.  If either
 258     * is NULL, use fixed-function code paths.
 259     *
 260     * These programs may come from several sources.  The priority is as
 261     * follows:
 262     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 263     *   2. ARB/NV vertex/fragment programs
 264     *   3. Programs derived from fixed-function state.
 265     *
 266     * Note: it's possible for a vertex shader to get used with a fragment
 267     * program (and vice versa) here, but in practice that shouldn't ever
 268     * come up, or matter.
 269     */
 270
 271    if (shProg && shProg->LinkStatus && shProg->FragmentProgram) {
 272       /* Use shader programs */
 273       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 274                                shProg->FragmentProgram);
 275    }
 276    else if (ctx->FragmentProgram._Enabled) {
 277       /* use user-defined vertex program */
 278       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 279                                ctx->FragmentProgram.Current);
 280    }
 281    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 282       /* Use fragment program generated from fixed-function state.
 283        */
 284       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 285                                _mesa_get_fixed_func_fragment_program(ctx));
 286       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 287                                ctx->FragmentProgram._Current);
 288    }
 289    else {
 290       /* no fragment program */
 291       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 292    }
 293
 294    /* Examine vertex program after fragment program as
 295     * _mesa_get_fixed_func_vertex_program() needs to know active
 296     * fragprog inputs.
 297     */
 298    if (shProg && shProg->LinkStatus && shProg->VertexProgram) {
 299       /* Use shader programs */
 300       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 301                             shProg->VertexProgram);
 302    }
 303    else if (ctx->VertexProgram._Enabled) {
 304       /* use user-defined vertex program */
 305       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 306                                ctx->VertexProgram.Current);
 307    }
 308    else if (ctx->VertexProgram._MaintainTnlProgram) {
 309       /* Use vertex program generated from fixed-function state.
 310        */
 311       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 312                                _mesa_get_fixed_func_vertex_program(ctx));
 313       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 314                                ctx->VertexProgram._Current);
 315    }
 316    else {
 317       /* no vertex program */
 318       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 319    }
 320
 321    /* Let the driver know what's happening:
 322     */
 323    if (ctx->FragmentProgram._Current != prevFP) {
 324       new_state |= _NEW_PROGRAM;
 325       if (ctx->Driver.BindProgram) {
 326          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 327                           (struct gl_program *) ctx->FragmentProgram._Current);
 328       }
 329    }
 330
 331    if (ctx->VertexProgram._Current != prevVP) {
 332       new_state |= _NEW_PROGRAM;
 333       if (ctx->Driver.BindProgram) {
 334          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 335                             (struct gl_program *) ctx->VertexProgram._Current);
 336       }
 337    }
 338
 339    return new_state;
 340 }
 341
 342
 343 /**
 344  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 345  */
 346 static GLbitfield
 347 update_program_constants(GLcontext *ctx)
 348 {
 349    GLbitfield new_state = 0x0;
 350
 351    if (ctx->FragmentProgram._Current) {
 352       const struct gl_program_parameter_list *params =
 353          ctx->FragmentProgram._Current->Base.Parameters;
 354       if (params && params->StateFlags & ctx->NewState) {
 355          new_state |= _NEW_PROGRAM_CONSTANTS;
 356       }
 357    }
 358
 359    if (ctx->VertexProgram._Current) {
 360       const struct gl_program_parameter_list *params =
 361          ctx->VertexProgram._Current->Base.Parameters;
 362       if (params && params->StateFlags & ctx->NewState) {
 363          new_state |= _NEW_PROGRAM_CONSTANTS;
 364       }
 365    }
 366
 367    return new_state;
 368 }
 369
 370
 371
 372
 373 static void
 374 update_viewport_matrix(GLcontext *ctx)
 375 {
 376    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 377
 378    ASSERT(depthMax > 0);
 379
 380    /* Compute scale and bias values. This is really driver-specific
 381     * and should be maintained elsewhere if at all.
 382     * NOTE: RasterPos uses this.
 383     */
 384    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 385                          ctx->Viewport.X, ctx->Viewport.Y,
 386                          ctx->Viewport.Width, ctx->Viewport.Height,
 387                          ctx->Viewport.Near, ctx->Viewport.Far,
 388                          depthMax);
 389 }
 390
 391
 392 /**
 393  * Update derived multisample state.
 394  */
 395 static void
 396 update_multisample(GLcontext *ctx)
 397 {
 398    ctx->Multisample._Enabled = GL_FALSE;
 399    if (ctx->Multisample.Enabled &&
 400        ctx->DrawBuffer &&
 401        ctx->DrawBuffer->Visual.sampleBuffers)
 402       ctx->Multisample._Enabled = GL_TRUE;
 403 }
 404
 405
 406 /**
 407  * Update derived color/blend/logicop state.
 408  */
 409 static void
 410 update_color(GLcontext *ctx)
 411 {
 412    /* This is needed to support 1.1's RGB logic ops AND
 413     * 1.0's blending logicops.
 414     */
 415    ctx->Color._LogicOpEnabled = RGBA_LOGICOP_ENABLED(ctx);
 416 }
 417
 418
 419 /*
 420  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 421  * in ctx->_TriangleCaps if needed.
 422  */
 423 static void
 424 update_polygon(GLcontext *ctx)
 425 {
 426    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 427
 428    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 429       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 430
 431    if (   ctx->Polygon.OffsetPoint
 432        || ctx->Polygon.OffsetLine
 433        || ctx->Polygon.OffsetFill)
 434       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 435 }
 436
 437
 438 /**
 439  * Update the ctx->_TriangleCaps bitfield.
 440  * XXX that bitfield should really go away someday!
 441  * This function must be called after other update_*() functions since
 442  * there are dependencies on some other derived values.
 443  */
 444 #if 0
 445 static void
 446 update_tricaps(GLcontext *ctx, GLbitfield new_state)
 447 {
 448    ctx->_TriangleCaps = 0;
 449
 450    /*
 451     * Points
 452     */
 453    if (1/*new_state & _NEW_POINT*/) {
 454       if (ctx->Point.SmoothFlag)
 455          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 456       if (ctx->Point.Size != 1.0F)
 457          ctx->_TriangleCaps |= DD_POINT_SIZE;
 458       if (ctx->Point._Attenuated)
 459          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 460    }
 461
 462    /*
 463     * Lines
 464     */
 465    if (1/*new_state & _NEW_LINE*/) {
 466       if (ctx->Line.SmoothFlag)
 467          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 468       if (ctx->Line.StippleFlag)
 469          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 470       if (ctx->Line.Width != 1.0)
 471          ctx->_TriangleCaps |= DD_LINE_WIDTH;
 472    }
 473
 474    /*
 475     * Polygons
 476     */
 477    if (1/*new_state & _NEW_POLYGON*/) {
 478       if (ctx->Polygon.SmoothFlag)
 479          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 480       if (ctx->Polygon.StippleFlag)
 481          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 482       if (ctx->Polygon.FrontMode != GL_FILL
 483           || ctx->Polygon.BackMode != GL_FILL)
 484          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 485       if (ctx->Polygon.CullFlag
 486           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 487          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 488       if (ctx->Polygon.OffsetPoint ||
 489           ctx->Polygon.OffsetLine ||
 490           ctx->Polygon.OffsetFill)
 491          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 492    }
 493
 494    /*
 495     * Lighting and shading
 496     */
 497    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 498       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 499    if (ctx->Light.ShadeModel == GL_FLAT)
 500       ctx->_TriangleCaps |= DD_FLATSHADE;
 501    if (NEED_SECONDARY_COLOR(ctx))
 502       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 503
 504    /*
 505     * Stencil
 506     */
 507    if (ctx->Stencil._TestTwoSide)
 508       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 509 }
 510 #endif
 511
 512
 513 /**
 514  * Compute derived GL state.
 515  * If __GLcontextRec::NewState is non-zero then this function \b must
 516  * be called before rendering anything.
 517  *
 518  * Calls dd_function_table::UpdateState to perform any internal state
 519  * management necessary.
 520  *
 521  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 522  * _mesa_update_buffer_bounds(),
 523  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 524  */
 525 void
 526 _mesa_update_state_locked( GLcontext *ctx )
 527 {
 528    GLbitfield new_state = ctx->NewState;
 529    GLbitfield prog_flags = _NEW_PROGRAM;
 530    GLbitfield new_prog_state = 0x0;
 531
 532    if (new_state == _NEW_CURRENT_ATTRIB)
 533       goto out;
 534
 535    if (MESA_VERBOSE & VERBOSE_STATE)
 536       _mesa_print_state("_mesa_update_state", new_state);
 537
 538    /* Determine which state flags effect vertex/fragment program state */
 539    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 540       prog_flags |= (_NEW_TEXTURE | _NEW_FOG |
 541                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 542                      _NEW_PROGRAM);
 543    }
 544    if (ctx->VertexProgram._MaintainTnlProgram) {
 545       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 546                      _NEW_TRANSFORM | _NEW_POINT |
 547                      _NEW_FOG | _NEW_LIGHT |
 548                      _MESA_NEW_NEED_EYE_COORDS);
 549    }
 550
 551    /*
 552     * Now update derived state info
 553     */
 554
 555    if (new_state & prog_flags)
 556       update_program_enables( ctx );
 557
 558    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 559       _mesa_update_modelview_project( ctx, new_state );
 560
 561    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 562       _mesa_update_texture( ctx, new_state );
 563
 564    if (new_state & _NEW_BUFFERS)
 565       _mesa_update_framebuffer(ctx);
 566
 567    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 568       _mesa_update_draw_buffer_bounds( ctx );
 569
 570    if (new_state & _NEW_POLYGON)
 571       update_polygon( ctx );
 572
 573    if (new_state & _NEW_LIGHT)
 574       _mesa_update_lighting( ctx );
 575
 576    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 577       _mesa_update_stencil( ctx );
 578
 579    if (new_state & _MESA_NEW_TRANSFER_STATE)
 580       _mesa_update_pixel( ctx, new_state );
 581
 582    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 583       update_separate_specular( ctx );
 584
 585    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 586       update_viewport_matrix(ctx);
 587
 588    if (new_state & _NEW_MULTISAMPLE)
 589       update_multisample( ctx );
 590
 591    if (new_state & _NEW_COLOR)
 592       update_color( ctx );
 593
 594 #if 0
 595    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 596                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 597       update_tricaps( ctx, new_state );
 598 #endif
 599
 600    /* ctx->_NeedEyeCoords is now up to date.
 601     *
 602     * If the truth value of this variable has changed, update for the
 603     * new lighting space and recompute the positions of lights and the
 604     * normal transform.
 605     *
 606     * If the lighting space hasn't changed, may still need to recompute
 607     * light positions & normal transforms for other reasons.
 608     */
 609    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 610       _mesa_update_tnl_spaces( ctx, new_state );
 611
 612    if (new_state & prog_flags) {
 613       /* When we generate programs from fixed-function vertex/fragment state
 614        * this call may generate/bind a new program.  If so, we need to
 615        * propogate the _NEW_PROGRAM flag to the driver.
 616        */
 617       new_prog_state |= update_program( ctx );
 618    }
 619
 620    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 621       update_arrays( ctx );
 622
 623  out:
 624    new_prog_state |= update_program_constants(ctx);
 625
 626    /*
 627     * Give the driver a chance to act upon the new_state flags.
 628     * The driver might plug in different span functions, for example.
 629     * Also, this is where the driver can invalidate the state of any
 630     * active modules (such as swrast_setup, swrast, tnl, etc).
 631     *
 632     * Set ctx->NewState to zero to avoid recursion if
 633     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 634     */
 635    new_state = ctx->NewState | new_prog_state;
 636    ctx->NewState = 0;
 637    ctx->Driver.UpdateState(ctx, new_state);
 638    ctx->Array.NewState = 0;
 639 }
 640
 641
 642 /* This is the usual entrypoint for state updates:
 643  */
 644 void
 645 _mesa_update_state( GLcontext *ctx )
 646 {
 647    _mesa_lock_context_textures(ctx);
 648    _mesa_update_state_locked(ctx);
 649    _mesa_unlock_context_textures(ctx);
 650 }
 651
 652
 653
 654
 655 /**
 656  * Want to figure out which fragment program inputs are actually
 657  * constant/current values from ctx->Current.  These should be
 658  * referenced as a tracked state variable rather than a fragment
 659  * program input, to save the overhead of putting a constant value in
 660  * every submitted vertex, transferring it to hardware, interpolating
 661  * it across the triangle, etc...
 662  *
 663  * When there is a VP bound, just use vp->outputs.  But when we're
 664  * generating vp from fixed function state, basically want to
 665  * calculate:
 666  *
 667  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 668  *                 potential_vp_outputs )
 669  *
 670  * Where potential_vp_outputs is calculated by looking at enabled
 671  * texgen, etc.
 672  *
 673  * The generated fragment program should then only declare inputs that
 674  * may vary or otherwise differ from the ctx->Current values.
 675  * Otherwise, the fp should track them as state values instead.
 676  */
 677 void
 678 _mesa_set_varying_vp_inputs( GLcontext *ctx,
 679                              GLbitfield varying_inputs )
 680 {
 681    if (ctx->varying_vp_inputs != varying_inputs) {
 682       ctx->varying_vp_inputs = varying_inputs;
 683       ctx->NewState |= _NEW_ARRAY;
 684       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 685    }
 686 }
 687
 688
 689 /**
 690  * Used by drivers to tell core Mesa that the driver is going to
 691  * install/ use its own vertex program.  In particular, this will
 692  * prevent generated fragment programs from using state vars instead
 693  * of ordinary varyings/inputs.
 694  */
 695 void
 696 _mesa_set_vp_override(GLcontext *ctx, GLboolean flag)
 697 {
 698    if (ctx->VertexProgram._Overriden != flag) {
 699       ctx->VertexProgram._Overriden = flag;
 700
 701       /* Set one of the bits which will trigger fragment program
 702        * regeneration:
 703        */
 704       ctx->NewState |= _NEW_PROGRAM;
 705    }
 706 }