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 "arrayobj.h"
  37 #include "context.h"
  38 #include "debug.h"
  39 #include "macros.h"
  40 #include "ffvertex_prog.h"
  41 #include "framebuffer.h"
  42 #include "light.h"
  43 #include "matrix.h"
  44 #include "pixel.h"
  45 #include "program/program.h"
  46 #include "program/prog_parameter.h"
  47 #include "shaderobj.h"
  48 #include "state.h"
  49 #include "stencil.h"
  50 #include "texenvprogram.h"
  51 #include "texobj.h"
  52 #include "texstate.h"
  53 #include "varray.h"
  54
  55
  56 static void
  57 update_separate_specular(struct gl_context *ctx)
  58 {
  59    if (_mesa_need_secondary_color(ctx))
  60       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  61    else
  62       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  63 }
  64
  65
  66 /**
  67  * Update the following fields:
  68  *   ctx->VertexProgram._Enabled
  69  *   ctx->FragmentProgram._Enabled
  70  *   ctx->ATIFragmentShader._Enabled
  71  * This needs to be done before texture state validation.
  72  */
  73 static void
  74 update_program_enables(struct gl_context *ctx)
  75 {
  76    /* These _Enabled flags indicate if the user-defined ARB/NV vertex/fragment
  77     * program is enabled AND valid.  Similarly for ATI fragment shaders.
  78     * GLSL shaders not relevant here.
  79     */
  80    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
  81       && ctx->VertexProgram.Current->Base.Instructions;
  82    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
  83       && ctx->FragmentProgram.Current->Base.Instructions;
  84    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
  85       && ctx->ATIFragmentShader.Current->Instructions[0];
  86 }
  87
  88
  89 /**
  90  * Update the ctx->Vertex/Geometry/FragmentProgram._Current pointers to point
  91  * to the current/active programs.  Then call ctx->Driver.BindProgram() to
  92  * tell the driver which programs to use.
  93  *
  94  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
  95  * programs or programs derived from fixed-function state.
  96  *
  97  * This function needs to be called after texture state validation in case
  98  * we're generating a fragment program from fixed-function texture state.
  99  *
 100  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 101  * or fragment program is being used.
 102  */
 103 static GLbitfield
 104 update_program(struct gl_context *ctx)
 105 {
 106    const struct gl_shader_program *vsProg = ctx->Shader.CurrentVertexProgram;
 107    const struct gl_shader_program *gsProg = ctx->Shader.CurrentGeometryProgram;
 108    struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;
 109    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 110    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 111    const struct gl_geometry_program *prevGP = ctx->GeometryProgram._Current;
 112    GLbitfield new_state = 0x0;
 113
 114    /*
 115     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 116     * pointers to the programs that should be used for rendering.  If either
 117     * is NULL, use fixed-function code paths.
 118     *
 119     * These programs may come from several sources.  The priority is as
 120     * follows:
 121     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 122     *   2. ARB/NV vertex/fragment programs
 123     *   3. Programs derived from fixed-function state.
 124     *
 125     * Note: it's possible for a vertex shader to get used with a fragment
 126     * program (and vice versa) here, but in practice that shouldn't ever
 127     * come up, or matter.
 128     */
 129
 130    if (fsProg && fsProg->LinkStatus
 131        && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {
 132       /* Use GLSL fragment shader */
 133       _mesa_reference_shader_program(ctx,
 134                                      &ctx->Shader._CurrentFragmentProgram,
 135                                      fsProg);
 136       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 137                                (struct gl_fragment_program *)
 138                                fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 139    }
 140    else if (ctx->FragmentProgram._Enabled) {
 141       /* Use user-defined fragment program */
 142       _mesa_reference_shader_program(ctx,
 143                                      &ctx->Shader._CurrentFragmentProgram,
 144                                      NULL);
 145       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 146                                ctx->FragmentProgram.Current);
 147    }
 148    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 149       /* Use fragment program generated from fixed-function state */
 150       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 151
 152       _mesa_reference_shader_program(ctx,
 153                                      &ctx->Shader._CurrentFragmentProgram,
 154                                      f);
 155       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 156                                (struct gl_fragment_program *)
 157                                f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 158    }
 159    else {
 160       /* No fragment program */
 161       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 162    }
 163
 164    if (gsProg && gsProg->LinkStatus
 165        && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {
 166       /* Use GLSL geometry shader */
 167       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 168                                (struct gl_geometry_program *)
 169                                gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program);
 170    } else {
 171       /* No geometry program */
 172       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 173    }
 174
 175    /* Examine vertex program after fragment program as
 176     * _mesa_get_fixed_func_vertex_program() needs to know active
 177     * fragprog inputs.
 178     */
 179    if (vsProg && vsProg->LinkStatus
 180        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 181       /* Use GLSL vertex shader */
 182       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 183                                (struct gl_vertex_program *)
 184                                vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program);
 185    }
 186    else if (ctx->VertexProgram._Enabled) {
 187       /* Use user-defined vertex program */
 188       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 189                                ctx->VertexProgram.Current);
 190    }
 191    else if (ctx->VertexProgram._MaintainTnlProgram) {
 192       /* Use vertex program generated from fixed-function state */
 193       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 194                                _mesa_get_fixed_func_vertex_program(ctx));
 195       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 196                                ctx->VertexProgram._Current);
 197    }
 198    else {
 199       /* no vertex program */
 200       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 201    }
 202
 203    /* Let the driver know what's happening:
 204     */
 205    if (ctx->FragmentProgram._Current != prevFP) {
 206       new_state |= _NEW_PROGRAM;
 207       if (ctx->Driver.BindProgram) {
 208          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 209                           (struct gl_program *) ctx->FragmentProgram._Current);
 210       }
 211    }
 212
 213    if (ctx->GeometryProgram._Current != prevGP) {
 214       new_state |= _NEW_PROGRAM;
 215       if (ctx->Driver.BindProgram) {
 216          ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,
 217                             (struct gl_program *) ctx->GeometryProgram._Current);
 218       }
 219    }
 220
 221    if (ctx->VertexProgram._Current != prevVP) {
 222       new_state |= _NEW_PROGRAM;
 223       if (ctx->Driver.BindProgram) {
 224          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 225                             (struct gl_program *) ctx->VertexProgram._Current);
 226       }
 227    }
 228
 229    return new_state;
 230 }
 231
 232
 233 /**
 234  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 235  */
 236 static GLbitfield
 237 update_program_constants(struct gl_context *ctx)
 238 {
 239    GLbitfield new_state = 0x0;
 240
 241    if (ctx->FragmentProgram._Current) {
 242       const struct gl_program_parameter_list *params =
 243          ctx->FragmentProgram._Current->Base.Parameters;
 244       if (params && params->StateFlags & ctx->NewState) {
 245          new_state |= _NEW_PROGRAM_CONSTANTS;
 246       }
 247    }
 248
 249    if (ctx->GeometryProgram._Current) {
 250       const struct gl_program_parameter_list *params =
 251          ctx->GeometryProgram._Current->Base.Parameters;
 252       /*FIXME: StateFlags is always 0 because we have unnamed constant
 253        *       not state changes */
 254       if (params /*&& params->StateFlags & ctx->NewState*/) {
 255          new_state |= _NEW_PROGRAM_CONSTANTS;
 256       }
 257    }
 258
 259    if (ctx->VertexProgram._Current) {
 260       const struct gl_program_parameter_list *params =
 261          ctx->VertexProgram._Current->Base.Parameters;
 262       if (params && params->StateFlags & ctx->NewState) {
 263          new_state |= _NEW_PROGRAM_CONSTANTS;
 264       }
 265    }
 266
 267    return new_state;
 268 }
 269
 270
 271
 272
 273 static void
 274 update_viewport_matrix(struct gl_context *ctx)
 275 {
 276    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 277
 278    ASSERT(depthMax > 0);
 279
 280    /* Compute scale and bias values. This is really driver-specific
 281     * and should be maintained elsewhere if at all.
 282     * NOTE: RasterPos uses this.
 283     */
 284    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 285                          ctx->Viewport.X, ctx->Viewport.Y,
 286                          ctx->Viewport.Width, ctx->Viewport.Height,
 287                          ctx->Viewport.Near, ctx->Viewport.Far,
 288                          depthMax);
 289 }
 290
 291
 292 /**
 293  * Update derived multisample state.
 294  */
 295 static void
 296 update_multisample(struct gl_context *ctx)
 297 {
 298    ctx->Multisample._Enabled = GL_FALSE;
 299    if (ctx->Multisample.Enabled &&
 300        ctx->DrawBuffer &&
 301        ctx->DrawBuffer->Visual.sampleBuffers)
 302       ctx->Multisample._Enabled = GL_TRUE;
 303 }
 304
 305
 306 /**
 307  * Update the ctx->Color._ClampFragmentColor field
 308  */
 309 static void
 310 update_clamp_fragment_color(struct gl_context *ctx)
 311 {
 312    if (ctx->Color.ClampFragmentColor == GL_FIXED_ONLY_ARB)
 313       ctx->Color._ClampFragmentColor =
 314          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 315    else
 316       ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
 317 }
 318
 319
 320 /**
 321  * Update the ctx->Color._ClampVertexColor field
 322  */
 323 static void
 324 update_clamp_vertex_color(struct gl_context *ctx)
 325 {
 326    if (ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
 327       ctx->Light._ClampVertexColor =
 328          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 329    else
 330       ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
 331 }
 332
 333
 334 /**
 335  * Update the ctx->Color._ClampReadColor field
 336  */
 337 static void
 338 update_clamp_read_color(struct gl_context *ctx)
 339 {
 340    if (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
 341       ctx->Color._ClampReadColor =
 342          !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
 343    else
 344       ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
 345 }
 346
 347 /**
 348  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 349  */
 350 static void
 351 update_twoside(struct gl_context *ctx)
 352 {
 353    if (ctx->Shader.CurrentVertexProgram ||
 354        ctx->VertexProgram._Enabled) {
 355       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 356    } else {
 357       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 358                                             ctx->Light.Model.TwoSide);
 359    }
 360 }
 361
 362
 363 /*
 364  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 365  * in ctx->_TriangleCaps if needed.
 366  */
 367 static void
 368 update_polygon(struct gl_context *ctx)
 369 {
 370    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 371
 372    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 373       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 374
 375    if (   ctx->Polygon.OffsetPoint
 376        || ctx->Polygon.OffsetLine
 377        || ctx->Polygon.OffsetFill)
 378       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 379 }
 380
 381
 382 /**
 383  * Update the ctx->_TriangleCaps bitfield.
 384  * XXX that bitfield should really go away someday!
 385  * This function must be called after other update_*() functions since
 386  * there are dependencies on some other derived values.
 387  */
 388 #if 0
 389 static void
 390 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 391 {
 392    ctx->_TriangleCaps = 0;
 393
 394    /*
 395     * Points
 396     */
 397    if (1/*new_state & _NEW_POINT*/) {
 398       if (ctx->Point.SmoothFlag)
 399          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 400       if (ctx->Point._Attenuated)
 401          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 402    }
 403
 404    /*
 405     * Lines
 406     */
 407    if (1/*new_state & _NEW_LINE*/) {
 408       if (ctx->Line.SmoothFlag)
 409          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 410       if (ctx->Line.StippleFlag)
 411          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 412    }
 413
 414    /*
 415     * Polygons
 416     */
 417    if (1/*new_state & _NEW_POLYGON*/) {
 418       if (ctx->Polygon.SmoothFlag)
 419          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 420       if (ctx->Polygon.StippleFlag)
 421          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 422       if (ctx->Polygon.FrontMode != GL_FILL
 423           || ctx->Polygon.BackMode != GL_FILL)
 424          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 425       if (ctx->Polygon.CullFlag
 426           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 427          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 428       if (ctx->Polygon.OffsetPoint ||
 429           ctx->Polygon.OffsetLine ||
 430           ctx->Polygon.OffsetFill)
 431          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 432    }
 433
 434    /*
 435     * Lighting and shading
 436     */
 437    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 438       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 439    if (ctx->Light.ShadeModel == GL_FLAT)
 440       ctx->_TriangleCaps |= DD_FLATSHADE;
 441    if (_mesa_need_secondary_color(ctx))
 442       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 443
 444    /*
 445     * Stencil
 446     */
 447    if (ctx->Stencil._TestTwoSide)
 448       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 449 }
 450 #endif
 451
 452
 453 /**
 454  * Compute derived GL state.
 455  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 456  * be called before rendering anything.
 457  *
 458  * Calls dd_function_table::UpdateState to perform any internal state
 459  * management necessary.
 460  *
 461  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 462  * _mesa_update_buffer_bounds(),
 463  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 464  */
 465 void
 466 _mesa_update_state_locked( struct gl_context *ctx )
 467 {
 468    GLbitfield new_state = ctx->NewState;
 469    GLbitfield prog_flags = _NEW_PROGRAM;
 470    GLbitfield new_prog_state = 0x0;
 471
 472    if (new_state == _NEW_CURRENT_ATTRIB)
 473       goto out;
 474
 475    if (MESA_VERBOSE & VERBOSE_STATE)
 476       _mesa_print_state("_mesa_update_state", new_state);
 477
 478    /* Determine which state flags effect vertex/fragment program state */
 479    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 480       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 481                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 482                      _NEW_PROGRAM | _NEW_FRAG_CLAMP | _NEW_COLOR);
 483    }
 484    if (ctx->VertexProgram._MaintainTnlProgram) {
 485       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 486                      _NEW_TRANSFORM | _NEW_POINT |
 487                      _NEW_FOG | _NEW_LIGHT |
 488                      _MESA_NEW_NEED_EYE_COORDS);
 489    }
 490
 491    /*
 492     * Now update derived state info
 493     */
 494
 495    if (new_state & prog_flags)
 496       update_program_enables( ctx );
 497
 498    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 499       _mesa_update_modelview_project( ctx, new_state );
 500
 501    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 502       _mesa_update_texture( ctx, new_state );
 503
 504    if (new_state & _NEW_BUFFERS)
 505       _mesa_update_framebuffer(ctx);
 506
 507    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 508       _mesa_update_draw_buffer_bounds( ctx );
 509
 510    if (new_state & _NEW_POLYGON)
 511       update_polygon( ctx );
 512
 513    if (new_state & _NEW_LIGHT)
 514       _mesa_update_lighting( ctx );
 515
 516    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 517       update_twoside( ctx );
 518
 519    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 520       update_clamp_vertex_color(ctx);
 521
 522    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 523       _mesa_update_stencil( ctx );
 524
 525    if (new_state & _NEW_PIXEL)
 526       _mesa_update_pixel( ctx, new_state );
 527
 528    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 529       update_separate_specular( ctx );
 530
 531    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 532       update_viewport_matrix(ctx);
 533
 534    if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))
 535       update_multisample( ctx );
 536
 537    if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
 538       update_clamp_read_color(ctx);
 539
 540    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 541       update_clamp_fragment_color(ctx);
 542
 543 #if 0
 544    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 545                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 546       update_tricaps( ctx, new_state );
 547 #endif
 548
 549    /* ctx->_NeedEyeCoords is now up to date.
 550     *
 551     * If the truth value of this variable has changed, update for the
 552     * new lighting space and recompute the positions of lights and the
 553     * normal transform.
 554     *
 555     * If the lighting space hasn't changed, may still need to recompute
 556     * light positions & normal transforms for other reasons.
 557     */
 558    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 559       _mesa_update_tnl_spaces( ctx, new_state );
 560
 561    if (new_state & prog_flags) {
 562       /* When we generate programs from fixed-function vertex/fragment state
 563        * this call may generate/bind a new program.  If so, we need to
 564        * propogate the _NEW_PROGRAM flag to the driver.
 565        */
 566       new_prog_state |= update_program( ctx );
 567    }
 568
 569    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 570       _mesa_update_array_object_max_element(ctx, ctx->Array.ArrayObj);
 571
 572  out:
 573    new_prog_state |= update_program_constants(ctx);
 574
 575    /*
 576     * Give the driver a chance to act upon the new_state flags.
 577     * The driver might plug in different span functions, for example.
 578     * Also, this is where the driver can invalidate the state of any
 579     * active modules (such as swrast_setup, swrast, tnl, etc).
 580     *
 581     * Set ctx->NewState to zero to avoid recursion if
 582     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 583     */
 584    new_state = ctx->NewState | new_prog_state;
 585    ctx->NewState = 0;
 586    ctx->Driver.UpdateState(ctx, new_state);
 587    ctx->Array.NewState = 0;
 588    if (!ctx->Array.RebindArrays)
 589       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 590 }
 591
 592
 593 /* This is the usual entrypoint for state updates:
 594  */
 595 void
 596 _mesa_update_state( struct gl_context *ctx )
 597 {
 598    _mesa_lock_context_textures(ctx);
 599    _mesa_update_state_locked(ctx);
 600    _mesa_unlock_context_textures(ctx);
 601 }
 602
 603
 604
 605
 606 /**
 607  * Want to figure out which fragment program inputs are actually
 608  * constant/current values from ctx->Current.  These should be
 609  * referenced as a tracked state variable rather than a fragment
 610  * program input, to save the overhead of putting a constant value in
 611  * every submitted vertex, transferring it to hardware, interpolating
 612  * it across the triangle, etc...
 613  *
 614  * When there is a VP bound, just use vp->outputs.  But when we're
 615  * generating vp from fixed function state, basically want to
 616  * calculate:
 617  *
 618  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 619  *                 potential_vp_outputs )
 620  *
 621  * Where potential_vp_outputs is calculated by looking at enabled
 622  * texgen, etc.
 623  *
 624  * The generated fragment program should then only declare inputs that
 625  * may vary or otherwise differ from the ctx->Current values.
 626  * Otherwise, the fp should track them as state values instead.
 627  */
 628 void
 629 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 630                              GLbitfield64 varying_inputs )
 631 {
 632    if (ctx->varying_vp_inputs != varying_inputs) {
 633       ctx->varying_vp_inputs = varying_inputs;
 634       ctx->NewState |= _NEW_ARRAY;
 635       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 636    }
 637 }
 638
 639
 640 /**
 641  * Used by drivers to tell core Mesa that the driver is going to
 642  * install/ use its own vertex program.  In particular, this will
 643  * prevent generated fragment programs from using state vars instead
 644  * of ordinary varyings/inputs.
 645  */
 646 void
 647 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 648 {
 649    if (ctx->VertexProgram._Overriden != flag) {
 650       ctx->VertexProgram._Overriden = flag;
 651
 652       /* Set one of the bits which will trigger fragment program
 653        * regeneration:
 654        */
 655       ctx->NewState |= _NEW_PROGRAM;
 656    }
 657 }