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  * Compute the index of the last array element that can be safely accessed
  68  * in a vertex array.  We can really only do this when the array lives in
  69  * a VBO.
  70  * The array->_MaxElement field will be updated.
  71  * Later in glDrawArrays/Elements/etc we can do some bounds checking.
  72  */
  73 static void
  74 compute_max_element(struct gl_client_array *array)
  75 {
  76    assert(array->Enabled);
  77    if (array->BufferObj->Name) {
  78       /* Compute the max element we can access in the VBO without going
  79        * out of bounds.
  80        */
  81       array->_MaxElement = ((GLsizeiptrARB) array->BufferObj->Size
  82                             - (GLsizeiptrARB) array->Ptr + array->StrideB
  83                             - array->_ElementSize) / array->StrideB;
  84    }
  85    else {
  86       /* user-space array, no idea how big it is */
  87       array->_MaxElement = 2 * 1000 * 1000 * 1000; /* just a big number */
  88    }
  89 }
  90
  91
  92 /**
  93  * Helper for update_arrays().
  94  * \return  min(current min, array->_MaxElement).
  95  */
  96 static GLuint
  97 update_min(GLuint min, struct gl_client_array *array)
  98 {
  99    compute_max_element(array);
 100    return MIN2(min, array->_MaxElement);
 101 }
 102
 103
 104 /**
 105  * Update ctx->Array._MaxElement (the max legal index into all enabled arrays).
 106  * Need to do this upon new array state or new buffer object state.
 107  */
 108 static void
 109 update_arrays( GLcontext *ctx )
 110 {
 111    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
 112    GLuint i, min = ~0;
 113
 114    /* find min of _MaxElement values for all enabled arrays */
 115
 116    /* 0 */
 117    if (ctx->VertexProgram._Current
 118        && arrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
 119       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_POS]);
 120    }
 121    else if (arrayObj->Vertex.Enabled) {
 122       min = update_min(min, &arrayObj->Vertex);
 123    }
 124
 125    /* 1 */
 126    if (ctx->VertexProgram._Enabled
 127        && arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT].Enabled) {
 128       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT]);
 129    }
 130    /* no conventional vertex weight array */
 131
 132    /* 2 */
 133    if (ctx->VertexProgram._Enabled
 134        && arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
 135       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]);
 136    }
 137    else if (arrayObj->Normal.Enabled) {
 138       min = update_min(min, &arrayObj->Normal);
 139    }
 140
 141    /* 3 */
 142    if (ctx->VertexProgram._Enabled
 143        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 144       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]);
 145    }
 146    else if (arrayObj->Color.Enabled) {
 147       min = update_min(min, &arrayObj->Color);
 148    }
 149
 150    /* 4 */
 151    if (ctx->VertexProgram._Enabled
 152        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 153       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]);
 154    }
 155    else if (arrayObj->SecondaryColor.Enabled) {
 156       min = update_min(min, &arrayObj->SecondaryColor);
 157    }
 158
 159    /* 5 */
 160    if (ctx->VertexProgram._Enabled
 161        && arrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 162       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_FOG]);
 163    }
 164    else if (arrayObj->FogCoord.Enabled) {
 165       min = update_min(min, &arrayObj->FogCoord);
 166    }
 167
 168    /* 6 */
 169    if (ctx->VertexProgram._Enabled
 170        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 171       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]);
 172    }
 173    else if (arrayObj->Index.Enabled) {
 174       min = update_min(min, &arrayObj->Index);
 175    }
 176
 177    /* 7 */
 178    if (ctx->VertexProgram._Enabled
 179        && arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 180       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]);
 181    }
 182
 183    /* 8..15 */
 184    for (i = VERT_ATTRIB_TEX0; i <= VERT_ATTRIB_TEX7; i++) {
 185       if (ctx->VertexProgram._Enabled
 186           && arrayObj->VertexAttrib[i].Enabled) {
 187          min = update_min(min, &arrayObj->VertexAttrib[i]);
 188       }
 189       else if (i - VERT_ATTRIB_TEX0 < ctx->Const.MaxTextureCoordUnits
 190                && arrayObj->TexCoord[i - VERT_ATTRIB_TEX0].Enabled) {
 191          min = update_min(min, &arrayObj->TexCoord[i - VERT_ATTRIB_TEX0]);
 192       }
 193    }
 194
 195    /* 16..31 */
 196    if (ctx->VertexProgram._Current) {
 197       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {
 198          if (arrayObj->VertexAttrib[i].Enabled) {
 199             min = update_min(min, &arrayObj->VertexAttrib[i]);
 200          }
 201       }
 202    }
 203
 204    if (arrayObj->EdgeFlag.Enabled) {
 205       min = update_min(min, &arrayObj->EdgeFlag);
 206    }
 207
 208    /* _MaxElement is one past the last legal array element */
 209    ctx->Array._MaxElement = min;
 210 }
 211
 212
 213 /**
 214  * Update the following fields:
 215  *   ctx->VertexProgram._Enabled
 216  *   ctx->FragmentProgram._Enabled
 217  *   ctx->ATIFragmentShader._Enabled
 218  * This needs to be done before texture state validation.
 219  */
 220 static void
 221 update_program_enables(GLcontext *ctx)
 222 {
 223    /* These _Enabled flags indicate if the program is enabled AND valid. */
 224    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 225       && ctx->VertexProgram.Current->Base.Instructions;
 226    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 227       && ctx->FragmentProgram.Current->Base.Instructions;
 228    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
 229       && ctx->ATIFragmentShader.Current->Instructions[0];
 230 }
 231
 232
 233 /**
 234  * Update vertex/fragment program state.  In particular, update these fields:
 235  *   ctx->VertexProgram._Current
 236  *   ctx->VertexProgram._TnlProgram,
 237  * These point to the highest priority enabled vertex/fragment program or are
 238  * NULL if fixed-function processing is to be done.
 239  *
 240  * This function needs to be called after texture state validation in case
 241  * we're generating a fragment program from fixed-function texture state.
 242  *
 243  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 244  * or fragment program is being used.
 245  */
 246 static GLbitfield
 247 update_program(GLcontext *ctx)
 248 {
 249    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 250    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 251    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 252    GLbitfield new_state = 0x0;
 253
 254    /*
 255     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 256     * pointers to the programs that should be used for rendering.  If either
 257     * is NULL, use fixed-function code paths.
 258     *
 259     * These programs may come from several sources.  The priority is as
 260     * follows:
 261     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 262     *   2. ARB/NV vertex/fragment programs
 263     *   3. Programs derived from fixed-function state.
 264     *
 265     * Note: it's possible for a vertex shader to get used with a fragment
 266     * program (and vice versa) here, but in practice that shouldn't ever
 267     * come up, or matter.
 268     */
 269
 270    if (shProg && shProg->LinkStatus && shProg->FragmentProgram) {
 271       /* Use shader programs */
 272       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 273                                shProg->FragmentProgram);
 274    }
 275    else if (ctx->FragmentProgram._Enabled) {
 276       /* use user-defined vertex program */
 277       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 278                                ctx->FragmentProgram.Current);
 279    }
 280    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 281       /* Use fragment program generated from fixed-function state.
 282        */
 283       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 284                                _mesa_get_fixed_func_fragment_program(ctx));
 285       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 286                                ctx->FragmentProgram._Current);
 287    }
 288    else {
 289       /* no fragment program */
 290       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 291    }
 292
 293    /* Examine vertex program after fragment program as
 294     * _mesa_get_fixed_func_vertex_program() needs to know active
 295     * fragprog inputs.
 296     */
 297    if (shProg && shProg->LinkStatus && shProg->VertexProgram) {
 298       /* Use shader programs */
 299       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 300                             shProg->VertexProgram);
 301    }
 302    else if (ctx->VertexProgram._Enabled) {
 303       /* use user-defined vertex program */
 304       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 305                                ctx->VertexProgram.Current);
 306    }
 307    else if (ctx->VertexProgram._MaintainTnlProgram) {
 308       /* Use vertex program generated from fixed-function state.
 309        */
 310       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 311                                _mesa_get_fixed_func_vertex_program(ctx));
 312       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 313                                ctx->VertexProgram._Current);
 314    }
 315    else {
 316       /* no vertex program */
 317       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 318    }
 319
 320    /* Let the driver know what's happening:
 321     */
 322    if (ctx->FragmentProgram._Current != prevFP) {
 323       new_state |= _NEW_PROGRAM;
 324       if (ctx->Driver.BindProgram) {
 325          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 326                           (struct gl_program *) ctx->FragmentProgram._Current);
 327       }
 328    }
 329
 330    if (ctx->VertexProgram._Current != prevVP) {
 331       new_state |= _NEW_PROGRAM;
 332       if (ctx->Driver.BindProgram) {
 333          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 334                             (struct gl_program *) ctx->VertexProgram._Current);
 335       }
 336    }
 337
 338    return new_state;
 339 }
 340
 341
 342 /**
 343  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 344  */
 345 static GLbitfield
 346 update_program_constants(GLcontext *ctx)
 347 {
 348    GLbitfield new_state = 0x0;
 349
 350    if (ctx->FragmentProgram._Current) {
 351       const struct gl_program_parameter_list *params =
 352          ctx->FragmentProgram._Current->Base.Parameters;
 353       if (params && params->StateFlags & ctx->NewState) {
 354          new_state |= _NEW_PROGRAM_CONSTANTS;
 355       }
 356    }
 357
 358    if (ctx->VertexProgram._Current) {
 359       const struct gl_program_parameter_list *params =
 360          ctx->VertexProgram._Current->Base.Parameters;
 361       if (params && params->StateFlags & ctx->NewState) {
 362          new_state |= _NEW_PROGRAM_CONSTANTS;
 363       }
 364    }
 365
 366    return new_state;
 367 }
 368
 369
 370
 371
 372 static void
 373 update_viewport_matrix(GLcontext *ctx)
 374 {
 375    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 376
 377    ASSERT(depthMax > 0);
 378
 379    /* Compute scale and bias values. This is really driver-specific
 380     * and should be maintained elsewhere if at all.
 381     * NOTE: RasterPos uses this.
 382     */
 383    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 384                          ctx->Viewport.X, ctx->Viewport.Y,
 385                          ctx->Viewport.Width, ctx->Viewport.Height,
 386                          ctx->Viewport.Near, ctx->Viewport.Far,
 387                          depthMax);
 388 }
 389
 390
 391 /**
 392  * Update derived multisample state.
 393  */
 394 static void
 395 update_multisample(GLcontext *ctx)
 396 {
 397    ctx->Multisample._Enabled = GL_FALSE;
 398    if (ctx->Multisample.Enabled &&
 399        ctx->DrawBuffer &&
 400        ctx->DrawBuffer->Visual.sampleBuffers)
 401       ctx->Multisample._Enabled = GL_TRUE;
 402 }
 403
 404
 405 /**
 406  * Update derived color/blend/logicop state.
 407  */
 408 static void
 409 update_color(GLcontext *ctx)
 410 {
 411    /* This is needed to support 1.1's RGB logic ops AND
 412     * 1.0's blending logicops.
 413     */
 414    ctx->Color._LogicOpEnabled = RGBA_LOGICOP_ENABLED(ctx);
 415 }
 416
 417
 418 /*
 419  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 420  * in ctx->_TriangleCaps if needed.
 421  */
 422 static void
 423 update_polygon(GLcontext *ctx)
 424 {
 425    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 426
 427    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 428       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 429
 430    if (   ctx->Polygon.OffsetPoint
 431        || ctx->Polygon.OffsetLine
 432        || ctx->Polygon.OffsetFill)
 433       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 434 }
 435
 436
 437 /**
 438  * Update the ctx->_TriangleCaps bitfield.
 439  * XXX that bitfield should really go away someday!
 440  * This function must be called after other update_*() functions since
 441  * there are dependencies on some other derived values.
 442  */
 443 #if 0
 444 static void
 445 update_tricaps(GLcontext *ctx, GLbitfield new_state)
 446 {
 447    ctx->_TriangleCaps = 0;
 448
 449    /*
 450     * Points
 451     */
 452    if (1/*new_state & _NEW_POINT*/) {
 453       if (ctx->Point.SmoothFlag)
 454          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 455       if (ctx->Point.Size != 1.0F)
 456          ctx->_TriangleCaps |= DD_POINT_SIZE;
 457       if (ctx->Point._Attenuated)
 458          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 459    }
 460
 461    /*
 462     * Lines
 463     */
 464    if (1/*new_state & _NEW_LINE*/) {
 465       if (ctx->Line.SmoothFlag)
 466          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 467       if (ctx->Line.StippleFlag)
 468          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 469       if (ctx->Line.Width != 1.0)
 470          ctx->_TriangleCaps |= DD_LINE_WIDTH;
 471    }
 472
 473    /*
 474     * Polygons
 475     */
 476    if (1/*new_state & _NEW_POLYGON*/) {
 477       if (ctx->Polygon.SmoothFlag)
 478          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 479       if (ctx->Polygon.StippleFlag)
 480          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 481       if (ctx->Polygon.FrontMode != GL_FILL
 482           || ctx->Polygon.BackMode != GL_FILL)
 483          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 484       if (ctx->Polygon.CullFlag
 485           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 486          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 487       if (ctx->Polygon.OffsetPoint ||
 488           ctx->Polygon.OffsetLine ||
 489           ctx->Polygon.OffsetFill)
 490          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 491    }
 492
 493    /*
 494     * Lighting and shading
 495     */
 496    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 497       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 498    if (ctx->Light.ShadeModel == GL_FLAT)
 499       ctx->_TriangleCaps |= DD_FLATSHADE;
 500    if (NEED_SECONDARY_COLOR(ctx))
 501       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 502
 503    /*
 504     * Stencil
 505     */
 506    if (ctx->Stencil._TestTwoSide)
 507       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 508 }
 509 #endif
 510
 511
 512 /**
 513  * Compute derived GL state.
 514  * If __GLcontextRec::NewState is non-zero then this function \b must
 515  * be called before rendering anything.
 516  *
 517  * Calls dd_function_table::UpdateState to perform any internal state
 518  * management necessary.
 519  *
 520  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 521  * _mesa_update_buffer_bounds(),
 522  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 523  */
 524 void
 525 _mesa_update_state_locked( GLcontext *ctx )
 526 {
 527    GLbitfield new_state = ctx->NewState;
 528    GLbitfield prog_flags = _NEW_PROGRAM;
 529    GLbitfield new_prog_state = 0x0;
 530
 531    if (new_state == _NEW_CURRENT_ATTRIB)
 532       goto out;
 533
 534    if (MESA_VERBOSE & VERBOSE_STATE)
 535       _mesa_print_state("_mesa_update_state", new_state);
 536
 537    /* Determine which state flags effect vertex/fragment program state */
 538    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 539       prog_flags |= (_NEW_TEXTURE | _NEW_FOG | _DD_NEW_SEPARATE_SPECULAR |
 540                      _NEW_ARRAY);
 541    }
 542    if (ctx->VertexProgram._MaintainTnlProgram) {
 543       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 544                      _NEW_TRANSFORM | _NEW_POINT |
 545                      _NEW_FOG | _NEW_LIGHT |
 546                      _MESA_NEW_NEED_EYE_COORDS);
 547    }
 548
 549    /*
 550     * Now update derived state info
 551     */
 552
 553    if (new_state & prog_flags)
 554       update_program_enables( ctx );
 555
 556    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 557       _mesa_update_modelview_project( ctx, new_state );
 558
 559    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 560       _mesa_update_texture( ctx, new_state );
 561
 562    if (new_state & _NEW_BUFFERS)
 563       _mesa_update_framebuffer(ctx);
 564
 565    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 566       _mesa_update_draw_buffer_bounds( ctx );
 567
 568    if (new_state & _NEW_POLYGON)
 569       update_polygon( ctx );
 570
 571    if (new_state & _NEW_LIGHT)
 572       _mesa_update_lighting( ctx );
 573
 574    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 575       _mesa_update_stencil( ctx );
 576
 577 #if FEATURE_pixel_transfer
 578    if (new_state & _MESA_NEW_TRANSFER_STATE)
 579       _mesa_update_pixel( ctx, new_state );
 580 #endif
 581
 582    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 583       update_separate_specular( ctx );
 584
 585    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 586       update_arrays( ctx );
 587
 588    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 589       update_viewport_matrix(ctx);
 590
 591    if (new_state & _NEW_MULTISAMPLE)
 592       update_multisample( ctx );
 593
 594    if (new_state & _NEW_COLOR)
 595       update_color( ctx );
 596
 597 #if 0
 598    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 599                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 600       update_tricaps( ctx, new_state );
 601 #endif
 602
 603    /* ctx->_NeedEyeCoords is now up to date.
 604     *
 605     * If the truth value of this variable has changed, update for the
 606     * new lighting space and recompute the positions of lights and the
 607     * normal transform.
 608     *
 609     * If the lighting space hasn't changed, may still need to recompute
 610     * light positions & normal transforms for other reasons.
 611     */
 612    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 613       _mesa_update_tnl_spaces( ctx, new_state );
 614
 615    if (new_state & prog_flags) {
 616       /* When we generate programs from fixed-function vertex/fragment state
 617        * this call may generate/bind a new program.  If so, we need to
 618        * propogate the _NEW_PROGRAM flag to the driver.
 619        */
 620       new_prog_state |= update_program( ctx );
 621    }
 622
 623
 624  out:
 625    new_prog_state |= update_program_constants(ctx);
 626
 627    /*
 628     * Give the driver a chance to act upon the new_state flags.
 629     * The driver might plug in different span functions, for example.
 630     * Also, this is where the driver can invalidate the state of any
 631     * active modules (such as swrast_setup, swrast, tnl, etc).
 632     *
 633     * Set ctx->NewState to zero to avoid recursion if
 634     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 635     */
 636    new_state = ctx->NewState | new_prog_state;
 637    ctx->NewState = 0;
 638    ctx->Driver.UpdateState(ctx, new_state);
 639    ctx->Array.NewState = 0;
 640 }
 641
 642
 643 /* This is the usual entrypoint for state updates:
 644  */
 645 void
 646 _mesa_update_state( GLcontext *ctx )
 647 {
 648    _mesa_lock_context_textures(ctx);
 649    _mesa_update_state_locked(ctx);
 650    _mesa_unlock_context_textures(ctx);
 651 }
 652
 653
 654
 655
 656 /**
 657  * Want to figure out which fragment program inputs are actually
 658  * constant/current values from ctx->Current.  These should be
 659  * referenced as a tracked state variable rather than a fragment
 660  * program input, to save the overhead of putting a constant value in
 661  * every submitted vertex, transferring it to hardware, interpolating
 662  * it across the triangle, etc...
 663  *
 664  * When there is a VP bound, just use vp->outputs.  But when we're
 665  * generating vp from fixed function state, basically want to
 666  * calculate:
 667  *
 668  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 669  *                 potential_vp_outputs )
 670  *
 671  * Where potential_vp_outputs is calculated by looking at enabled
 672  * texgen, etc.
 673  *
 674  * The generated fragment program should then only declare inputs that
 675  * may vary or otherwise differ from the ctx->Current values.
 676  * Otherwise, the fp should track them as state values instead.
 677  */
 678 void
 679 _mesa_set_varying_vp_inputs( GLcontext *ctx,
 680                              GLbitfield varying_inputs )
 681 {
 682    if (ctx->varying_vp_inputs != varying_inputs) {
 683       ctx->varying_vp_inputs = varying_inputs;
 684       ctx->NewState |= _NEW_ARRAY;
 685       /*_mesa_printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 686    }
 687 }
 688
 689
 690 /**
 691  * Used by drivers to tell core Mesa that the driver is going to
 692  * install/ use its own vertex program.  In particular, this will
 693  * prevent generated fragment programs from using state vars instead
 694  * of ordinary varyings/inputs.
 695  */
 696 void
 697 _mesa_set_vp_override(GLcontext *ctx, GLboolean flag)
 698 {
 699    if (ctx->VertexProgram._Overriden != flag) {
 700       ctx->VertexProgram._Overriden = flag;
 701
 702       /* Set one of the bits which will trigger fragment program
 703        * regeneration:
 704        */
 705       ctx->NewState |= _NEW_ARRAY;
 706    }
 707 }