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