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 "state.h"
  48 #include "stencil.h"
  49 #include "texenvprogram.h"
  50 #include "texobj.h"
  51 #include "texstate.h"
  52 #include "viewport.h"
  53
  54
  55 static void
  56 update_separate_specular(GLcontext *ctx)
  57 {
  58    if (NEED_SECONDARY_COLOR(ctx))
  59       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  60    else
  61       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  62 }
  63
  64
  65 /**
  66  * Update state dependent on vertex arrays.
  67  */
  68 static void
  69 update_arrays( GLcontext *ctx )
  70 {
  71    GLuint i, min;
  72
  73    /* find min of _MaxElement values for all enabled arrays */
  74
  75    /* 0 */
  76    if (ctx->VertexProgram._Current
  77        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
  78       min = ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POS]._MaxElement;
  79    }
  80    else if (ctx->Array.ArrayObj->Vertex.Enabled) {
  81       min = ctx->Array.ArrayObj->Vertex._MaxElement;
  82    }
  83    else {
  84       /* can't draw anything without vertex positions! */
  85       min = 0;
  86    }
  87
  88    /* 1 */
  89    if (ctx->VertexProgram._Enabled
  90        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT].Enabled) {
  91       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT]._MaxElement);
  92    }
  93    /* no conventional vertex weight array */
  94
  95    /* 2 */
  96    if (ctx->VertexProgram._Enabled
  97        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
  98       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]._MaxElement);
  99    }
 100    else if (ctx->Array.ArrayObj->Normal.Enabled) {
 101       min = MIN2(min, ctx->Array.ArrayObj->Normal._MaxElement);
 102    }
 103
 104    /* 3 */
 105    if (ctx->VertexProgram._Enabled
 106        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 107       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]._MaxElement);
 108    }
 109    else if (ctx->Array.ArrayObj->Color.Enabled) {
 110       min = MIN2(min, ctx->Array.ArrayObj->Color._MaxElement);
 111    }
 112
 113    /* 4 */
 114    if (ctx->VertexProgram._Enabled
 115        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 116       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]._MaxElement);
 117    }
 118    else if (ctx->Array.ArrayObj->SecondaryColor.Enabled) {
 119       min = MIN2(min, ctx->Array.ArrayObj->SecondaryColor._MaxElement);
 120    }
 121
 122    /* 5 */
 123    if (ctx->VertexProgram._Enabled
 124        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 125       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_FOG]._MaxElement);
 126    }
 127    else if (ctx->Array.ArrayObj->FogCoord.Enabled) {
 128       min = MIN2(min, ctx->Array.ArrayObj->FogCoord._MaxElement);
 129    }
 130
 131    /* 6 */
 132    if (ctx->VertexProgram._Enabled
 133        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 134       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]._MaxElement);
 135    }
 136    else if (ctx->Array.ArrayObj->Index.Enabled) {
 137       min = MIN2(min, ctx->Array.ArrayObj->Index._MaxElement);
 138    }
 139
 140
 141    /* 7 */
 142    if (ctx->VertexProgram._Enabled
 143        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 144       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]._MaxElement);
 145    }
 146
 147    /* 8..15 */
 148    for (i = VERT_ATTRIB_TEX0; i <= VERT_ATTRIB_TEX7; i++) {
 149       if (ctx->VertexProgram._Enabled
 150           && ctx->Array.ArrayObj->VertexAttrib[i].Enabled) {
 151          min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[i]._MaxElement);
 152       }
 153       else if (i - VERT_ATTRIB_TEX0 < ctx->Const.MaxTextureCoordUnits
 154                && ctx->Array.ArrayObj->TexCoord[i - VERT_ATTRIB_TEX0].Enabled) {
 155          min = MIN2(min, ctx->Array.ArrayObj->TexCoord[i - VERT_ATTRIB_TEX0]._MaxElement);
 156       }
 157    }
 158
 159    /* 16..31 */
 160    if (ctx->VertexProgram._Current) {
 161       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {
 162          if (ctx->Array.ArrayObj->VertexAttrib[i].Enabled) {
 163             min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[i]._MaxElement);
 164          }
 165       }
 166    }
 167
 168    if (ctx->Array.ArrayObj->EdgeFlag.Enabled) {
 169       min = MIN2(min, ctx->Array.ArrayObj->EdgeFlag._MaxElement);
 170    }
 171
 172    /* _MaxElement is one past the last legal array element */
 173    ctx->Array._MaxElement = min;
 174 }
 175
 176
 177 /**
 178  * Update the following fields:
 179  *   ctx->VertexProgram._Enabled
 180  *   ctx->FragmentProgram._Enabled
 181  *   ctx->ATIFragmentShader._Enabled
 182  * This needs to be done before texture state validation.
 183  */
 184 static void
 185 update_program_enables(GLcontext *ctx)
 186 {
 187    /* These _Enabled flags indicate if the program is enabled AND valid. */
 188    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 189       && ctx->VertexProgram.Current->Base.Instructions;
 190    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 191       && ctx->FragmentProgram.Current->Base.Instructions;
 192    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
 193       && ctx->ATIFragmentShader.Current->Instructions[0];
 194 }
 195
 196
 197 /**
 198  * Update vertex/fragment program state.  In particular, update these fields:
 199  *   ctx->VertexProgram._Current
 200  *   ctx->VertexProgram._TnlProgram,
 201  * These point to the highest priority enabled vertex/fragment program or are
 202  * NULL if fixed-function processing is to be done.
 203  *
 204  * This function needs to be called after texture state validation in case
 205  * we're generating a fragment program from fixed-function texture state.
 206  *
 207  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 208  * or fragment program is being used.
 209  */
 210 static GLbitfield
 211 update_program(GLcontext *ctx)
 212 {
 213    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 214    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 215    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 216    GLbitfield new_state = 0x0;
 217
 218    /*
 219     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 220     * pointers to the programs that should be used for rendering.  If either
 221     * is NULL, use fixed-function code paths.
 222     *
 223     * These programs may come from several sources.  The priority is as
 224     * follows:
 225     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 226     *   2. ARB/NV vertex/fragment programs
 227     *   3. Programs derived from fixed-function state.
 228     *
 229     * Note: it's possible for a vertex shader to get used with a fragment
 230     * program (and vice versa) here, but in practice that shouldn't ever
 231     * come up, or matter.
 232     */
 233
 234    if (shProg && shProg->LinkStatus && shProg->FragmentProgram) {
 235       /* Use shader programs */
 236       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 237                                shProg->FragmentProgram);
 238    }
 239    else if (ctx->FragmentProgram._Enabled) {
 240       /* use user-defined vertex program */
 241       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 242                                ctx->FragmentProgram.Current);
 243    }
 244    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 245       /* Use fragment program generated from fixed-function state.
 246        */
 247       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 248                                _mesa_get_fixed_func_fragment_program(ctx));
 249       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 250                                ctx->FragmentProgram._Current);
 251    }
 252    else {
 253       /* no fragment program */
 254       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 255    }
 256
 257    /* Examine vertex program after fragment program as
 258     * _mesa_get_fixed_func_vertex_program() needs to know active
 259     * fragprog inputs.
 260     */
 261    if (shProg && shProg->LinkStatus && shProg->VertexProgram) {
 262       /* Use shader programs */
 263       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 264                             shProg->VertexProgram);
 265    }
 266    else if (ctx->VertexProgram._Enabled) {
 267       /* use user-defined vertex program */
 268       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 269                                ctx->VertexProgram.Current);
 270    }
 271    else if (ctx->VertexProgram._MaintainTnlProgram) {
 272       /* Use vertex program generated from fixed-function state.
 273        */
 274       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 275                                _mesa_get_fixed_func_vertex_program(ctx));
 276       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 277                                ctx->VertexProgram._Current);
 278    }
 279    else {
 280       /* no vertex program */
 281       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 282    }
 283
 284    /* Let the driver know what's happening:
 285     */
 286    if (ctx->FragmentProgram._Current != prevFP) {
 287       new_state |= _NEW_PROGRAM;
 288       if (ctx->Driver.BindProgram) {
 289          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 290                           (struct gl_program *) ctx->FragmentProgram._Current);
 291       }
 292    }
 293
 294    if (ctx->VertexProgram._Current != prevVP) {
 295       new_state |= _NEW_PROGRAM;
 296       if (ctx->Driver.BindProgram) {
 297          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 298                             (struct gl_program *) ctx->VertexProgram._Current);
 299       }
 300    }
 301
 302    return new_state;
 303 }
 304
 305
 306 static void
 307 update_viewport_matrix(GLcontext *ctx)
 308 {
 309    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 310
 311    ASSERT(depthMax > 0);
 312
 313    /* Compute scale and bias values. This is really driver-specific
 314     * and should be maintained elsewhere if at all.
 315     * NOTE: RasterPos uses this.
 316     */
 317    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 318                          ctx->Viewport.X, ctx->Viewport.Y,
 319                          ctx->Viewport.Width, ctx->Viewport.Height,
 320                          ctx->Viewport.Near, ctx->Viewport.Far,
 321                          depthMax);
 322 }
 323
 324
 325 /**
 326  * Update derived multisample state.
 327  */
 328 static void
 329 update_multisample(GLcontext *ctx)
 330 {
 331    ctx->Multisample._Enabled = GL_FALSE;
 332    if (ctx->Multisample.Enabled &&
 333        ctx->DrawBuffer &&
 334        ctx->DrawBuffer->Visual.sampleBuffers)
 335       ctx->Multisample._Enabled = GL_TRUE;
 336 }
 337
 338
 339 /**
 340  * Update derived color/blend/logicop state.
 341  */
 342 static void
 343 update_color(GLcontext *ctx)
 344 {
 345    /* This is needed to support 1.1's RGB logic ops AND
 346     * 1.0's blending logicops.
 347     */
 348    ctx->Color._LogicOpEnabled = RGBA_LOGICOP_ENABLED(ctx);
 349 }
 350
 351
 352 /*
 353  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 354  * in ctx->_TriangleCaps if needed.
 355  */
 356 static void
 357 update_polygon(GLcontext *ctx)
 358 {
 359    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 360
 361    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 362       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 363
 364    if (   ctx->Polygon.OffsetPoint
 365        || ctx->Polygon.OffsetLine
 366        || ctx->Polygon.OffsetFill)
 367       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 368 }
 369
 370
 371 /**
 372  * Update the ctx->_TriangleCaps bitfield.
 373  * XXX that bitfield should really go away someday!
 374  * This function must be called after other update_*() functions since
 375  * there are dependencies on some other derived values.
 376  */
 377 #if 0
 378 static void
 379 update_tricaps(GLcontext *ctx, GLbitfield new_state)
 380 {
 381    ctx->_TriangleCaps = 0;
 382
 383    /*
 384     * Points
 385     */
 386    if (1/*new_state & _NEW_POINT*/) {
 387       if (ctx->Point.SmoothFlag)
 388          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 389       if (ctx->Point.Size != 1.0F)
 390          ctx->_TriangleCaps |= DD_POINT_SIZE;
 391       if (ctx->Point._Attenuated)
 392          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 393    }
 394
 395    /*
 396     * Lines
 397     */
 398    if (1/*new_state & _NEW_LINE*/) {
 399       if (ctx->Line.SmoothFlag)
 400          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 401       if (ctx->Line.StippleFlag)
 402          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 403       if (ctx->Line.Width != 1.0)
 404          ctx->_TriangleCaps |= DD_LINE_WIDTH;
 405    }
 406
 407    /*
 408     * Polygons
 409     */
 410    if (1/*new_state & _NEW_POLYGON*/) {
 411       if (ctx->Polygon.SmoothFlag)
 412          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 413       if (ctx->Polygon.StippleFlag)
 414          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 415       if (ctx->Polygon.FrontMode != GL_FILL
 416           || ctx->Polygon.BackMode != GL_FILL)
 417          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 418       if (ctx->Polygon.CullFlag
 419           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 420          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 421       if (ctx->Polygon.OffsetPoint ||
 422           ctx->Polygon.OffsetLine ||
 423           ctx->Polygon.OffsetFill)
 424          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 425    }
 426
 427    /*
 428     * Lighting and shading
 429     */
 430    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 431       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 432    if (ctx->Light.ShadeModel == GL_FLAT)
 433       ctx->_TriangleCaps |= DD_FLATSHADE;
 434    if (NEED_SECONDARY_COLOR(ctx))
 435       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 436
 437    /*
 438     * Stencil
 439     */
 440    if (ctx->Stencil._TestTwoSide)
 441       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 442 }
 443 #endif
 444
 445
 446 /**
 447  * Compute derived GL state.
 448  * If __GLcontextRec::NewState is non-zero then this function \b must
 449  * be called before rendering anything.
 450  *
 451  * Calls dd_function_table::UpdateState to perform any internal state
 452  * management necessary.
 453  *
 454  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 455  * _mesa_update_buffer_bounds(),
 456  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 457  */
 458 void
 459 _mesa_update_state_locked( GLcontext *ctx )
 460 {
 461    GLbitfield new_state = ctx->NewState;
 462    GLbitfield prog_flags = _NEW_PROGRAM;
 463    GLbitfield new_prog_state = 0x0;
 464
 465    if (new_state == _NEW_CURRENT_ATTRIB)
 466       goto out;
 467
 468    if (MESA_VERBOSE & VERBOSE_STATE)
 469       _mesa_print_state("_mesa_update_state", new_state);
 470
 471    /* Determine which state flags effect vertex/fragment program state */
 472    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 473       prog_flags |= (_NEW_TEXTURE | _NEW_FOG | _DD_NEW_SEPARATE_SPECULAR);
 474    }
 475    if (ctx->VertexProgram._MaintainTnlProgram) {
 476       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 477                      _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_STENCIL | _NEW_BUFFERS))
 508       _mesa_update_stencil( ctx );
 509
 510 #if FEATURE_pixel_transfer
 511    if (new_state & _MESA_NEW_TRANSFER_STATE)
 512       _mesa_update_pixel( ctx, new_state );
 513 #endif
 514
 515    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 516       update_separate_specular( ctx );
 517
 518    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM))
 519       update_arrays( ctx );
 520
 521    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 522       update_viewport_matrix(ctx);
 523
 524    if (new_state & _NEW_MULTISAMPLE)
 525       update_multisample( ctx );
 526
 527    if (new_state & _NEW_COLOR)
 528       update_color( ctx );
 529
 530 #if 0
 531    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 532                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 533       update_tricaps( ctx, new_state );
 534 #endif
 535
 536    /* ctx->_NeedEyeCoords is now up to date.
 537     *
 538     * If the truth value of this variable has changed, update for the
 539     * new lighting space and recompute the positions of lights and the
 540     * normal transform.
 541     *
 542     * If the lighting space hasn't changed, may still need to recompute
 543     * light positions & normal transforms for other reasons.
 544     */
 545    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 546       _mesa_update_tnl_spaces( ctx, new_state );
 547
 548    if (new_state & prog_flags) {
 549       /* When we generate programs from fixed-function vertex/fragment state
 550        * this call may generate/bind a new program.  If so, we need to
 551        * propogate the _NEW_PROGRAM flag to the driver.
 552        */
 553       new_prog_state |= update_program( ctx );
 554    }
 555
 556    /*
 557     * Give the driver a chance to act upon the new_state flags.
 558     * The driver might plug in different span functions, for example.
 559     * Also, this is where the driver can invalidate the state of any
 560     * active modules (such as swrast_setup, swrast, tnl, etc).
 561     *
 562     * Set ctx->NewState to zero to avoid recursion if
 563     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 564     */
 565  out:
 566    new_state = ctx->NewState | new_prog_state;
 567    ctx->NewState = 0;
 568    ctx->Driver.UpdateState(ctx, new_state);
 569    ctx->Array.NewState = 0;
 570 }
 571
 572
 573 /* This is the usual entrypoint for state updates:
 574  */
 575 void
 576 _mesa_update_state( GLcontext *ctx )
 577 {
 578    _mesa_lock_context_textures(ctx);
 579    _mesa_update_state_locked(ctx);
 580    _mesa_unlock_context_textures(ctx);
 581 }
 582
 583
 584
 585
 586 /**
 587  * Want to figure out which fragment program inputs are actually
 588  * constant/current values from ctx->Current.  These should be
 589  * referenced as a tracked state variable rather than a fragment
 590  * program input, to save the overhead of putting a constant value in
 591  * every submitted vertex, transferring it to hardware, interpolating
 592  * it across the triangle, etc...
 593  *
 594  * When there is a VP bound, just use vp->outputs.  But when we're
 595  * generating vp from fixed function state, basically want to
 596  * calculate:
 597  *
 598  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 599  *                 potential_vp_outputs )
 600  *
 601  * Where potential_vp_outputs is calculated by looking at enabled
 602  * texgen, etc.
 603  *
 604  * The generated fragment program should then only declare inputs that
 605  * may vary or otherwise differ from the ctx->Current values.
 606  * Otherwise, the fp should track them as state values instead.
 607  */
 608 void
 609 _mesa_set_varying_vp_inputs( GLcontext *ctx,
 610                              GLbitfield varying_inputs )
 611 {
 612    if (ctx->varying_vp_inputs != varying_inputs) {
 613       ctx->varying_vp_inputs = varying_inputs;
 614       ctx->NewState |= _NEW_ARRAY;
 615       /*_mesa_printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 616    }
 617 }
 618
 619
 620 /**
 621  * Used by drivers to tell core Mesa that the driver is going to
 622  * install/ use its own vertex program.  In particular, this will
 623  * prevent generated fragment programs from using state vars instead
 624  * of ordinary varyings/inputs.
 625  */
 626 void
 627 _mesa_set_vp_override(GLcontext *ctx, GLboolean flag)
 628 {
 629    if (ctx->VertexProgram._Overriden != flag) {
 630       ctx->VertexProgram._Overriden = flag;
 631
 632       /* Set one of the bits which will trigger fragment program
 633        * regeneration:
 634        */
 635       ctx->NewState |= _NEW_ARRAY;
 636    }
 637 }