src/mesa/main/state.c

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