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
  53
  54 static void
  55 update_separate_specular(GLcontext *ctx)
  56 {
  57    if (NEED_SECONDARY_COLOR(ctx))
  58       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  59    else
  60       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  61 }
  62
  63
  64 /**
  65  * Update state dependent on vertex arrays.
  66  */
  67 static void
  68 update_arrays( GLcontext *ctx )
  69 {
  70    GLuint i, min;
  71
  72    /* find min of _MaxElement values for all enabled arrays */
  73
  74    /* 0 */
  75    if (ctx->VertexProgram._Current
  76        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
  77       min = ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POS]._MaxElement;
  78    }
  79    else if (ctx->Array.ArrayObj->Vertex.Enabled) {
  80       min = ctx->Array.ArrayObj->Vertex._MaxElement;
  81    }
  82    else {
  83       /* can't draw anything without vertex positions! */
  84       min = 0;
  85    }
  86
  87    /* 1 */
  88    if (ctx->VertexProgram._Enabled
  89        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT].Enabled) {
  90       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT]._MaxElement);
  91    }
  92    /* no conventional vertex weight array */
  93
  94    /* 2 */
  95    if (ctx->VertexProgram._Enabled
  96        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
  97       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]._MaxElement);
  98    }
  99    else if (ctx->Array.ArrayObj->Normal.Enabled) {
 100       min = MIN2(min, ctx->Array.ArrayObj->Normal._MaxElement);
 101    }
 102
 103    /* 3 */
 104    if (ctx->VertexProgram._Enabled
 105        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 106       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]._MaxElement);
 107    }
 108    else if (ctx->Array.ArrayObj->Color.Enabled) {
 109       min = MIN2(min, ctx->Array.ArrayObj->Color._MaxElement);
 110    }
 111
 112    /* 4 */
 113    if (ctx->VertexProgram._Enabled
 114        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 115       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]._MaxElement);
 116    }
 117    else if (ctx->Array.ArrayObj->SecondaryColor.Enabled) {
 118       min = MIN2(min, ctx->Array.ArrayObj->SecondaryColor._MaxElement);
 119    }
 120
 121    /* 5 */
 122    if (ctx->VertexProgram._Enabled
 123        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 124       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_FOG]._MaxElement);
 125    }
 126    else if (ctx->Array.ArrayObj->FogCoord.Enabled) {
 127       min = MIN2(min, ctx->Array.ArrayObj->FogCoord._MaxElement);
 128    }
 129
 130    /* 6 */
 131    if (ctx->VertexProgram._Enabled
 132        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 133       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]._MaxElement);
 134    }
 135    else if (ctx->Array.ArrayObj->Index.Enabled) {
 136       min = MIN2(min, ctx->Array.ArrayObj->Index._MaxElement);
 137    }
 138
 139
 140    /* 7 */
 141    if (ctx->VertexProgram._Enabled
 142        && ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 143       min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]._MaxElement);
 144    }
 145
 146    /* 8..15 */
 147    for (i = VERT_ATTRIB_TEX0; i <= VERT_ATTRIB_TEX7; i++) {
 148       if (ctx->VertexProgram._Enabled
 149           && ctx->Array.ArrayObj->VertexAttrib[i].Enabled) {
 150          min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[i]._MaxElement);
 151       }
 152       else if (i - VERT_ATTRIB_TEX0 < ctx->Const.MaxTextureCoordUnits
 153                && ctx->Array.ArrayObj->TexCoord[i - VERT_ATTRIB_TEX0].Enabled) {
 154          min = MIN2(min, ctx->Array.ArrayObj->TexCoord[i - VERT_ATTRIB_TEX0]._MaxElement);
 155       }
 156    }
 157
 158    /* 16..31 */
 159    if (ctx->VertexProgram._Current) {
 160       for (i = VERT_ATTRIB_GENERIC0; i < VERT_ATTRIB_MAX; i++) {
 161          if (ctx->Array.ArrayObj->VertexAttrib[i].Enabled) {
 162             min = MIN2(min, ctx->Array.ArrayObj->VertexAttrib[i]._MaxElement);
 163          }
 164       }
 165    }
 166
 167    if (ctx->Array.ArrayObj->EdgeFlag.Enabled) {
 168       min = MIN2(min, ctx->Array.ArrayObj->EdgeFlag._MaxElement);
 169    }
 170
 171    /* _MaxElement is one past the last legal array element */
 172    ctx->Array._MaxElement = min;
 173 }
 174
 175
 176 static void
 177 update_program(GLcontext *ctx)
 178 {
 179    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 180    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 181    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 182
 183    /* These _Enabled flags indicate if the program is enabled AND valid. */
 184    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 185       && ctx->VertexProgram.Current->Base.Instructions;
 186    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 187       && ctx->FragmentProgram.Current->Base.Instructions;
 188    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
 189       && ctx->ATIFragmentShader.Current->Instructions[0];
 190
 191    /*
 192     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 193     * pointers to the programs that should be used for rendering.  If either
 194     * is NULL, use fixed-function code paths.
 195     *
 196     * These programs may come from several sources.  The priority is as
 197     * follows:
 198     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 199     *   2. ARB/NV vertex/fragment programs
 200     *   3. Programs derived from fixed-function state.
 201     *
 202     * Note: it's possible for a vertex shader to get used with a fragment
 203     * program (and vice versa) here, but in practice that shouldn't ever
 204     * come up, or matter.
 205     */
 206
 207    if (shProg && shProg->LinkStatus && shProg->FragmentProgram) {
 208       /* Use shader programs */
 209       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 210                                shProg->FragmentProgram);
 211    }
 212    else if (ctx->FragmentProgram._Enabled) {
 213       /* use user-defined vertex program */
 214       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 215                                ctx->FragmentProgram.Current);
 216    }
 217    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 218       /* Use fragment program generated from fixed-function state.
 219        */
 220       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 221                                _mesa_get_fixed_func_fragment_program(ctx));
 222       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 223                                ctx->FragmentProgram._Current);
 224    }
 225    else {
 226       /* no fragment program */
 227       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 228    }
 229
 230    /* Examine vertex program after fragment program as
 231     * _mesa_get_fixed_func_vertex_program() needs to know active
 232     * fragprog inputs.
 233     */
 234    if (shProg && shProg->LinkStatus && shProg->VertexProgram) {
 235       /* Use shader programs */
 236       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 237                             shProg->VertexProgram);
 238    }
 239    else if (ctx->VertexProgram._Enabled) {
 240       /* use user-defined vertex program */
 241       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 242                                ctx->VertexProgram.Current);
 243    }
 244    else if (ctx->VertexProgram._MaintainTnlProgram) {
 245       /* Use vertex program generated from fixed-function state.
 246        */
 247       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 248                                _mesa_get_fixed_func_vertex_program(ctx));
 249       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 250                                ctx->VertexProgram._Current);
 251    }
 252    else {
 253       /* no vertex program */
 254       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 255    }
 256
 257    /* XXX: get rid of _Active flag.
 258     */
 259 #if 1
 260    ctx->FragmentProgram._Active = ctx->FragmentProgram._Enabled;
 261    if (ctx->FragmentProgram._MaintainTexEnvProgram &&
 262        !ctx->FragmentProgram._Enabled) {
 263       if (ctx->FragmentProgram._UseTexEnvProgram)
 264          ctx->FragmentProgram._Active = GL_TRUE;
 265    }
 266 #endif
 267
 268    /* Let the driver know what's happening:
 269     */
 270    if (ctx->FragmentProgram._Current != prevFP && ctx->Driver.BindProgram) {
 271       ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 272                               (struct gl_program *) ctx->FragmentProgram._Current);
 273    }
 274
 275    if (ctx->VertexProgram._Current != prevVP && ctx->Driver.BindProgram) {
 276       ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 277                               (struct gl_program *) ctx->VertexProgram._Current);
 278    }
 279 }
 280
 281
 282 static void
 283 update_viewport_matrix(GLcontext *ctx)
 284 {
 285    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 286
 287    ASSERT(depthMax > 0);
 288
 289    /* Compute scale and bias values. This is really driver-specific
 290     * and should be maintained elsewhere if at all.
 291     * NOTE: RasterPos uses this.
 292     */
 293    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 294                          ctx->Viewport.X, ctx->Viewport.Y,
 295                          ctx->Viewport.Width, ctx->Viewport.Height,
 296                          ctx->Viewport.Near, ctx->Viewport.Far,
 297                          depthMax);
 298 }
 299
 300
 301 /**
 302  * Update derived multisample state.
 303  */
 304 static void
 305 update_multisample(GLcontext *ctx)
 306 {
 307    ctx->Multisample._Enabled = GL_FALSE;
 308    if (ctx->Multisample.Enabled &&
 309        ctx->DrawBuffer &&
 310        ctx->DrawBuffer->Visual.sampleBuffers)
 311       ctx->Multisample._Enabled = GL_TRUE;
 312 }
 313
 314
 315 /**
 316  * Update derived color/blend/logicop state.
 317  */
 318 static void
 319 update_color(GLcontext *ctx)
 320 {
 321    /* This is needed to support 1.1's RGB logic ops AND
 322     * 1.0's blending logicops.
 323     */
 324    ctx->Color._LogicOpEnabled = RGBA_LOGICOP_ENABLED(ctx);
 325 }
 326
 327
 328 /*
 329  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 330  * in ctx->_TriangleCaps if needed.
 331  */
 332 static void
 333 update_polygon(GLcontext *ctx)
 334 {
 335    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 336
 337    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 338       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 339
 340    if (   ctx->Polygon.OffsetPoint
 341        || ctx->Polygon.OffsetLine
 342        || ctx->Polygon.OffsetFill)
 343       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 344 }
 345
 346
 347 /**
 348  * Update the ctx->_TriangleCaps bitfield.
 349  * XXX that bitfield should really go away someday!
 350  * This function must be called after other update_*() functions since
 351  * there are dependencies on some other derived values.
 352  */
 353 #if 0
 354 static void
 355 update_tricaps(GLcontext *ctx, GLbitfield new_state)
 356 {
 357    ctx->_TriangleCaps = 0;
 358
 359    /*
 360     * Points
 361     */
 362    if (1/*new_state & _NEW_POINT*/) {
 363       if (ctx->Point.SmoothFlag)
 364          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 365       if (ctx->Point.Size != 1.0F)
 366          ctx->_TriangleCaps |= DD_POINT_SIZE;
 367       if (ctx->Point._Attenuated)
 368          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 369    }
 370
 371    /*
 372     * Lines
 373     */
 374    if (1/*new_state & _NEW_LINE*/) {
 375       if (ctx->Line.SmoothFlag)
 376          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 377       if (ctx->Line.StippleFlag)
 378          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 379       if (ctx->Line.Width != 1.0)
 380          ctx->_TriangleCaps |= DD_LINE_WIDTH;
 381    }
 382
 383    /*
 384     * Polygons
 385     */
 386    if (1/*new_state & _NEW_POLYGON*/) {
 387       if (ctx->Polygon.SmoothFlag)
 388          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 389       if (ctx->Polygon.StippleFlag)
 390          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 391       if (ctx->Polygon.FrontMode != GL_FILL
 392           || ctx->Polygon.BackMode != GL_FILL)
 393          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 394       if (ctx->Polygon.CullFlag
 395           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 396          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 397       if (ctx->Polygon.OffsetPoint ||
 398           ctx->Polygon.OffsetLine ||
 399           ctx->Polygon.OffsetFill)
 400          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 401    }
 402
 403    /*
 404     * Lighting and shading
 405     */
 406    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 407       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 408    if (ctx->Light.ShadeModel == GL_FLAT)
 409       ctx->_TriangleCaps |= DD_FLATSHADE;
 410    if (NEED_SECONDARY_COLOR(ctx))
 411       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 412
 413    /*
 414     * Stencil
 415     */
 416    if (ctx->Stencil._TestTwoSide)
 417       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 418 }
 419 #endif
 420
 421
 422 /**
 423  * Compute derived GL state.
 424  * If __GLcontextRec::NewState is non-zero then this function \b must
 425  * be called before rendering anything.
 426  *
 427  * Calls dd_function_table::UpdateState to perform any internal state
 428  * management necessary.
 429  *
 430  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 431  * _mesa_update_buffer_bounds(),
 432  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 433  */
 434 void
 435 _mesa_update_state_locked( GLcontext *ctx )
 436 {
 437    GLbitfield new_state = ctx->NewState;
 438    GLbitfield prog_flags = _NEW_PROGRAM;
 439
 440    if (new_state == _NEW_CURRENT_ATTRIB)
 441       goto out;
 442
 443    if (MESA_VERBOSE & VERBOSE_STATE)
 444       _mesa_print_state("_mesa_update_state", new_state);
 445
 446    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 447       _mesa_update_modelview_project( ctx, new_state );
 448
 449    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 450       _mesa_update_texture( ctx, new_state );
 451
 452    if (new_state & _NEW_BUFFERS)
 453       _mesa_update_framebuffer(ctx);
 454
 455    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 456       _mesa_update_draw_buffer_bounds( ctx );
 457
 458    if (new_state & _NEW_POLYGON)
 459       update_polygon( ctx );
 460
 461    if (new_state & _NEW_LIGHT)
 462       _mesa_update_lighting( ctx );
 463
 464    if (new_state & _NEW_STENCIL)
 465       _mesa_update_stencil( ctx );
 466
 467 #if FEATURE_pixel_transfer
 468    if (new_state & _IMAGE_NEW_TRANSFER_STATE)
 469       _mesa_update_pixel( ctx, new_state );
 470 #endif
 471
 472    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 473       update_separate_specular( ctx );
 474
 475    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM))
 476       update_arrays( ctx );
 477
 478    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 479       update_viewport_matrix(ctx);
 480
 481    if (new_state & _NEW_MULTISAMPLE)
 482       update_multisample( ctx );
 483
 484    if (new_state & _NEW_COLOR)
 485       update_color( ctx );
 486
 487 #if 0
 488    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 489                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 490       update_tricaps( ctx, new_state );
 491 #endif
 492
 493    /* ctx->_NeedEyeCoords is now up to date.
 494     *
 495     * If the truth value of this variable has changed, update for the
 496     * new lighting space and recompute the positions of lights and the
 497     * normal transform.
 498     *
 499     * If the lighting space hasn't changed, may still need to recompute
 500     * light positions & normal transforms for other reasons.
 501     */
 502    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 503       _mesa_update_tnl_spaces( ctx, new_state );
 504
 505    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 506       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE_MATRIX | _NEW_LIGHT |
 507                      _NEW_RENDERMODE |
 508                      _NEW_TEXTURE | _NEW_FOG | _DD_NEW_SEPARATE_SPECULAR);
 509    }
 510    if (ctx->VertexProgram._MaintainTnlProgram) {
 511       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 512                      _NEW_RENDERMODE |
 513                      _NEW_TRANSFORM | _NEW_POINT |
 514                      _NEW_FOG | _NEW_LIGHT |
 515                      _MESA_NEW_NEED_EYE_COORDS);
 516    }
 517    if (new_state & prog_flags)
 518       update_program( ctx );
 519
 520
 521
 522    /*
 523     * Give the driver a chance to act upon the new_state flags.
 524     * The driver might plug in different span functions, for example.
 525     * Also, this is where the driver can invalidate the state of any
 526     * active modules (such as swrast_setup, swrast, tnl, etc).
 527     *
 528     * Set ctx->NewState to zero to avoid recursion if
 529     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 530     */
 531  out:
 532    new_state = ctx->NewState;
 533    ctx->NewState = 0;
 534    ctx->Driver.UpdateState(ctx, new_state);
 535    ctx->Array.NewState = 0;
 536 }
 537
 538
 539 /* This is the usual entrypoint for state updates:
 540  */
 541 void
 542 _mesa_update_state( GLcontext *ctx )
 543 {
 544    _mesa_lock_context_textures(ctx);
 545    _mesa_update_state_locked(ctx);
 546    _mesa_unlock_context_textures(ctx);
 547 }
 548
 549
 550
 551
 552 /**
 553  * Want to figure out which fragment program inputs are actually
 554  * constant/current values from ctx->Current.  These should be
 555  * referenced as a tracked state variable rather than a fragment
 556  * program input, to save the overhead of putting a constant value in
 557  * every submitted vertex, transferring it to hardware, interpolating
 558  * it across the triangle, etc...
 559  *
 560  * When there is a VP bound, just use vp->outputs.  But when we're
 561  * generating vp from fixed function state, basically want to
 562  * calculate:
 563  *
 564  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 565  *                 potential_vp_outputs )
 566  *
 567  * Where potential_vp_outputs is calculated by looking at enabled
 568  * texgen, etc.
 569  *
 570  * The generated fragment program should then only declare inputs that
 571  * may vary or otherwise differ from the ctx->Current values.
 572  * Otherwise, the fp should track them as state values instead.
 573  */
 574 void
 575 _mesa_set_varying_vp_inputs( GLcontext *ctx,
 576                              GLbitfield varying_inputs )
 577 {
 578    if (ctx->varying_vp_inputs != varying_inputs) {
 579       ctx->varying_vp_inputs = varying_inputs;
 580       ctx->NewState |= _NEW_ARRAY;
 581       /*_mesa_printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 582    }
 583 }
 584
 585
 586 /**
 587  * Used by drivers to tell core Mesa that the driver is going to
 588  * install/ use its own vertex program.  In particular, this will
 589  * prevent generated fragment programs from using state vars instead
 590  * of ordinary varyings/inputs.
 591  */
 592 void
 593 _mesa_set_vp_override(GLcontext *ctx, GLboolean flag)
 594 {
 595    if (ctx->VertexProgram._Overriden != flag) {
 596       ctx->VertexProgram._Overriden = flag;
 597
 598       /* Set one of the bits which will trigger fragment program
 599        * regeneration:
 600        */
 601       ctx->NewState |= _NEW_ARRAY;
 602    }
 603 }