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