src/mesa/main/state.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * 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 #include "viewport.h"
  55 #include "blend.h"
  56
  57
  58 /**
  59  * Update the following fields:
  60  *   ctx->VertexProgram._Enabled
  61  *   ctx->FragmentProgram._Enabled
  62  *   ctx->ATIFragmentShader._Enabled
  63  * This needs to be done before texture state validation.
  64  */
  65 static void
  66 update_program_enables(struct gl_context *ctx)
  67 {
  68    /* These _Enabled flags indicate if the user-defined ARB/NV vertex/fragment
  69     * program is enabled AND valid.  Similarly for ATI fragment shaders.
  70     * GLSL shaders not relevant here.
  71     */
  72    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
  73       && ctx->VertexProgram.Current->Base.Instructions;
  74    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
  75       && ctx->FragmentProgram.Current->Base.Instructions;
  76    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
  77       && ctx->ATIFragmentShader.Current->Instructions[0];
  78 }
  79
  80
  81 /**
  82  * Update the ctx->*Program._Current pointers to point to the
  83  * current/active programs.  Then call ctx->Driver.BindProgram() to
  84  * tell the driver which programs to use.
  85  *
  86  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
  87  * programs or programs derived from fixed-function state.
  88  *
  89  * This function needs to be called after texture state validation in case
  90  * we're generating a fragment program from fixed-function texture state.
  91  *
  92  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
  93  * or fragment program is being used.
  94  */
  95 static GLbitfield
  96 update_program(struct gl_context *ctx)
  97 {
  98    const struct gl_shader_program *vsProg =
  99       ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
 100    const struct gl_shader_program *tcsProg =
 101       ctx->_Shader->CurrentProgram[MESA_SHADER_TESS_CTRL];
 102    const struct gl_shader_program *tesProg =
 103       ctx->_Shader->CurrentProgram[MESA_SHADER_TESS_EVAL];
 104    const struct gl_shader_program *gsProg =
 105       ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY];
 106    struct gl_shader_program *fsProg =
 107       ctx->_Shader->CurrentProgram[MESA_SHADER_FRAGMENT];
 108    const struct gl_shader_program *csProg =
 109       ctx->_Shader->CurrentProgram[MESA_SHADER_COMPUTE];
 110    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 111    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 112    const struct gl_geometry_program *prevGP = ctx->GeometryProgram._Current;
 113    const struct gl_tess_ctrl_program *prevTCP = ctx->TessCtrlProgram._Current;
 114    const struct gl_tess_eval_program *prevTEP = ctx->TessEvalProgram._Current;
 115    const struct gl_compute_program *prevCP = ctx->ComputeProgram._Current;
 116    GLbitfield new_state = 0x0;
 117
 118    /*
 119     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 120     * pointers to the programs that should be used for rendering.  If either
 121     * is NULL, use fixed-function code paths.
 122     *
 123     * These programs may come from several sources.  The priority is as
 124     * follows:
 125     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 126     *   2. ARB/NV vertex/fragment programs
 127     *   3. ATI fragment shader
 128     *   4. Programs derived from fixed-function state.
 129     *
 130     * Note: it's possible for a vertex shader to get used with a fragment
 131     * program (and vice versa) here, but in practice that shouldn't ever
 132     * come up, or matter.
 133     */
 134
 135    if (fsProg && fsProg->LinkStatus
 136        && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {
 137       /* Use GLSL fragment shader */
 138       _mesa_reference_shader_program(ctx,
 139                                      &ctx->_Shader->_CurrentFragmentProgram,
 140                                      fsProg);
 141       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 142                                gl_fragment_program(fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));
 143       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 144                                NULL);
 145    }
 146    else if (ctx->FragmentProgram._Enabled) {
 147       /* Use user-defined fragment program */
 148       _mesa_reference_shader_program(ctx,
 149                                      &ctx->_Shader->_CurrentFragmentProgram,
 150                                      NULL);
 151       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 152                                ctx->FragmentProgram.Current);
 153       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 154                                NULL);
 155    }
 156    else if (ctx->ATIFragmentShader._Enabled &&
 157             ctx->ATIFragmentShader.Current->Program) {
 158        /* Use the enabled ATI fragment shader's associated program */
 159       _mesa_reference_shader_program(ctx,
 160                                      &ctx->_Shader->_CurrentFragmentProgram,
 161                                      NULL);
 162       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 163                                gl_fragment_program(ctx->ATIFragmentShader.Current->Program));
 164       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 165                                NULL);
 166    }
 167    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 168       /* Use fragment program generated from fixed-function state */
 169       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 170
 171       _mesa_reference_shader_program(ctx,
 172                                      &ctx->_Shader->_CurrentFragmentProgram,
 173                                      f);
 174       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 175                                gl_fragment_program(f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));
 176       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 177                                gl_fragment_program(f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));
 178    }
 179    else {
 180       /* No fragment program */
 181       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 182       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 183                                NULL);
 184    }
 185
 186    if (gsProg && gsProg->LinkStatus
 187        && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {
 188       /* Use GLSL geometry shader */
 189       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 190                                gl_geometry_program(gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program));
 191    } else {
 192       /* No geometry program */
 193       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 194    }
 195
 196    if (tesProg && tesProg->LinkStatus
 197        && tesProg->_LinkedShaders[MESA_SHADER_TESS_EVAL]) {
 198       /* Use GLSL tessellation evaluation shader */
 199       _mesa_reference_tesseprog(ctx, &ctx->TessEvalProgram._Current,
 200          gl_tess_eval_program(
 201             tesProg->_LinkedShaders[MESA_SHADER_TESS_EVAL]->Program));
 202    }
 203    else {
 204       /* No tessellation evaluation program */
 205       _mesa_reference_tesseprog(ctx, &ctx->TessEvalProgram._Current, NULL);
 206    }
 207
 208    if (tcsProg && tcsProg->LinkStatus
 209        && tcsProg->_LinkedShaders[MESA_SHADER_TESS_CTRL]) {
 210       /* Use GLSL tessellation control shader */
 211       _mesa_reference_tesscprog(ctx, &ctx->TessCtrlProgram._Current,
 212          gl_tess_ctrl_program(
 213             tcsProg->_LinkedShaders[MESA_SHADER_TESS_CTRL]->Program));
 214    }
 215    else {
 216       /* No tessellation control program */
 217       _mesa_reference_tesscprog(ctx, &ctx->TessCtrlProgram._Current, NULL);
 218    }
 219
 220    /* Examine vertex program after fragment program as
 221     * _mesa_get_fixed_func_vertex_program() needs to know active
 222     * fragprog inputs.
 223     */
 224    if (vsProg && vsProg->LinkStatus
 225        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 226       /* Use GLSL vertex shader */
 227       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 228                                gl_vertex_program(vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program));
 229    }
 230    else if (ctx->VertexProgram._Enabled) {
 231       /* Use user-defined vertex program */
 232       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 233                                ctx->VertexProgram.Current);
 234    }
 235    else if (ctx->VertexProgram._MaintainTnlProgram) {
 236       /* Use vertex program generated from fixed-function state */
 237       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 238                                _mesa_get_fixed_func_vertex_program(ctx));
 239       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 240                                ctx->VertexProgram._Current);
 241    }
 242    else {
 243       /* no vertex program */
 244       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 245    }
 246
 247    if (csProg && csProg->LinkStatus
 248        && csProg->_LinkedShaders[MESA_SHADER_COMPUTE]) {
 249       /* Use GLSL compute shader */
 250       _mesa_reference_compprog(ctx, &ctx->ComputeProgram._Current,
 251                                gl_compute_program(csProg->_LinkedShaders[MESA_SHADER_COMPUTE]->Program));
 252    } else {
 253       /* no compute program */
 254       _mesa_reference_compprog(ctx, &ctx->ComputeProgram._Current, NULL);
 255    }
 256
 257    /* Let the driver know what's happening:
 258     */
 259    if (ctx->FragmentProgram._Current != prevFP) {
 260       new_state |= _NEW_PROGRAM;
 261       if (ctx->Driver.BindProgram) {
 262          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 263                           (struct gl_program *) ctx->FragmentProgram._Current);
 264       }
 265    }
 266
 267    if (ctx->GeometryProgram._Current != prevGP) {
 268       new_state |= _NEW_PROGRAM;
 269       if (ctx->Driver.BindProgram) {
 270          ctx->Driver.BindProgram(ctx, GL_GEOMETRY_PROGRAM_NV,
 271                             (struct gl_program *) ctx->GeometryProgram._Current);
 272       }
 273    }
 274
 275    if (ctx->TessEvalProgram._Current != prevTEP) {
 276       new_state |= _NEW_PROGRAM;
 277       if (ctx->Driver.BindProgram) {
 278          ctx->Driver.BindProgram(ctx, GL_TESS_EVALUATION_PROGRAM_NV,
 279                             (struct gl_program *) ctx->TessEvalProgram._Current);
 280       }
 281    }
 282
 283    if (ctx->TessCtrlProgram._Current != prevTCP) {
 284       new_state |= _NEW_PROGRAM;
 285       if (ctx->Driver.BindProgram) {
 286          ctx->Driver.BindProgram(ctx, GL_TESS_CONTROL_PROGRAM_NV,
 287                             (struct gl_program *) ctx->TessCtrlProgram._Current);
 288       }
 289    }
 290
 291    if (ctx->VertexProgram._Current != prevVP) {
 292       new_state |= _NEW_PROGRAM;
 293       if (ctx->Driver.BindProgram) {
 294          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 295                             (struct gl_program *) ctx->VertexProgram._Current);
 296       }
 297    }
 298
 299    if (ctx->ComputeProgram._Current != prevCP) {
 300       new_state |= _NEW_PROGRAM;
 301       if (ctx->Driver.BindProgram) {
 302          ctx->Driver.BindProgram(ctx, GL_COMPUTE_PROGRAM_NV,
 303                                  (struct gl_program *) ctx->ComputeProgram._Current);
 304       }
 305    }
 306
 307    return new_state;
 308 }
 309
 310
 311 /**
 312  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 313  */
 314 static GLbitfield
 315 update_program_constants(struct gl_context *ctx)
 316 {
 317    GLbitfield new_state = 0x0;
 318
 319    if (ctx->FragmentProgram._Current) {
 320       const struct gl_program_parameter_list *params =
 321          ctx->FragmentProgram._Current->Base.Parameters;
 322       if (params && params->StateFlags & ctx->NewState) {
 323          new_state |= _NEW_PROGRAM_CONSTANTS;
 324       }
 325    }
 326
 327    /* Don't handle tessellation and geometry shaders here. They don't use
 328     * any state constants.
 329     */
 330
 331    if (ctx->VertexProgram._Current) {
 332       const struct gl_program_parameter_list *params =
 333          ctx->VertexProgram._Current->Base.Parameters;
 334       if (params && params->StateFlags & ctx->NewState) {
 335          new_state |= _NEW_PROGRAM_CONSTANTS;
 336       }
 337    }
 338
 339    return new_state;
 340 }
 341
 342
 343
 344
 345 /**
 346  * Update the ctx->Polygon._FrontBit flag.
 347  */
 348 static void
 349 update_frontbit(struct gl_context *ctx)
 350 {
 351    if (ctx->Transform.ClipOrigin == GL_LOWER_LEFT)
 352       ctx->Polygon._FrontBit = (ctx->Polygon.FrontFace == GL_CW);
 353    else
 354       ctx->Polygon._FrontBit = (ctx->Polygon.FrontFace == GL_CCW);
 355 }
 356
 357
 358 /**
 359  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 360  */
 361 static void
 362 update_twoside(struct gl_context *ctx)
 363 {
 364    if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX] ||
 365        ctx->VertexProgram._Enabled) {
 366       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 367    } else {
 368       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 369                                             ctx->Light.Model.TwoSide);
 370    }
 371 }
 372
 373
 374 /**
 375  * Compute derived GL state.
 376  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 377  * be called before rendering anything.
 378  *
 379  * Calls dd_function_table::UpdateState to perform any internal state
 380  * management necessary.
 381  *
 382  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 383  * _mesa_update_buffer_bounds(),
 384  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 385  */
 386 void
 387 _mesa_update_state_locked( struct gl_context *ctx )
 388 {
 389    GLbitfield new_state = ctx->NewState;
 390    GLbitfield prog_flags = _NEW_PROGRAM;
 391    GLbitfield new_prog_state = 0x0;
 392    const GLbitfield computed_states = ~(_NEW_CURRENT_ATTRIB | _NEW_LINE);
 393
 394    /* we can skip a bunch of state validation checks if the dirty
 395     * state matches one or more bits in 'computed_states'.
 396     */
 397    if ((new_state & computed_states) == 0)
 398       goto out;
 399
 400    if (MESA_VERBOSE & VERBOSE_STATE)
 401       _mesa_print_state("_mesa_update_state", new_state);
 402
 403    /* Determine which state flags effect vertex/fragment program state */
 404    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 405       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 406                      _NEW_VARYING_VP_INPUTS | _NEW_LIGHT | _NEW_POINT |
 407                      _NEW_RENDERMODE | _NEW_PROGRAM | _NEW_FRAG_CLAMP |
 408                      _NEW_COLOR);
 409    }
 410    if (ctx->VertexProgram._MaintainTnlProgram) {
 411       prog_flags |= (_NEW_VARYING_VP_INPUTS | _NEW_TEXTURE |
 412                      _NEW_TEXTURE_MATRIX | _NEW_TRANSFORM | _NEW_POINT |
 413                      _NEW_FOG | _NEW_LIGHT |
 414                      _MESA_NEW_NEED_EYE_COORDS);
 415    }
 416
 417    /*
 418     * Now update derived state info
 419     */
 420
 421    if (new_state & prog_flags)
 422       update_program_enables( ctx );
 423
 424    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 425       _mesa_update_modelview_project( ctx, new_state );
 426
 427    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 428       _mesa_update_texture( ctx, new_state );
 429
 430    if (new_state & _NEW_POLYGON)
 431       update_frontbit( ctx );
 432
 433    if (new_state & _NEW_BUFFERS)
 434       _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
 435
 436    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 437       _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);
 438
 439    if (new_state & _NEW_LIGHT)
 440       _mesa_update_lighting( ctx );
 441
 442    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 443       update_twoside( ctx );
 444
 445    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 446       _mesa_update_stencil( ctx );
 447
 448    if (new_state & _NEW_PIXEL)
 449       _mesa_update_pixel( ctx, new_state );
 450
 451    /* ctx->_NeedEyeCoords is now up to date.
 452     *
 453     * If the truth value of this variable has changed, update for the
 454     * new lighting space and recompute the positions of lights and the
 455     * normal transform.
 456     *
 457     * If the lighting space hasn't changed, may still need to recompute
 458     * light positions & normal transforms for other reasons.
 459     */
 460    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 461       _mesa_update_tnl_spaces( ctx, new_state );
 462
 463    if (new_state & prog_flags) {
 464       /* When we generate programs from fixed-function vertex/fragment state
 465        * this call may generate/bind a new program.  If so, we need to
 466        * propogate the _NEW_PROGRAM flag to the driver.
 467        */
 468       new_prog_state |= update_program( ctx );
 469    }
 470
 471    if (new_state & _NEW_ARRAY)
 472       _mesa_update_vao_client_arrays(ctx, ctx->Array.VAO);
 473
 474  out:
 475    new_prog_state |= update_program_constants(ctx);
 476
 477    /*
 478     * Give the driver a chance to act upon the new_state flags.
 479     * The driver might plug in different span functions, for example.
 480     * Also, this is where the driver can invalidate the state of any
 481     * active modules (such as swrast_setup, swrast, tnl, etc).
 482     *
 483     * Set ctx->NewState to zero to avoid recursion if
 484     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 485     */
 486    new_state = ctx->NewState | new_prog_state;
 487    ctx->NewState = 0;
 488    ctx->Driver.UpdateState(ctx, new_state);
 489    ctx->Array.VAO->NewArrays = 0x0;
 490 }
 491
 492
 493 /* This is the usual entrypoint for state updates:
 494  */
 495 void
 496 _mesa_update_state( struct gl_context *ctx )
 497 {
 498    _mesa_lock_context_textures(ctx);
 499    _mesa_update_state_locked(ctx);
 500    _mesa_unlock_context_textures(ctx);
 501 }
 502
 503
 504
 505
 506 /**
 507  * Want to figure out which fragment program inputs are actually
 508  * constant/current values from ctx->Current.  These should be
 509  * referenced as a tracked state variable rather than a fragment
 510  * program input, to save the overhead of putting a constant value in
 511  * every submitted vertex, transferring it to hardware, interpolating
 512  * it across the triangle, etc...
 513  *
 514  * When there is a VP bound, just use vp->outputs.  But when we're
 515  * generating vp from fixed function state, basically want to
 516  * calculate:
 517  *
 518  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 519  *                 potential_vp_outputs )
 520  *
 521  * Where potential_vp_outputs is calculated by looking at enabled
 522  * texgen, etc.
 523  *
 524  * The generated fragment program should then only declare inputs that
 525  * may vary or otherwise differ from the ctx->Current values.
 526  * Otherwise, the fp should track them as state values instead.
 527  */
 528 void
 529 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 530                              GLbitfield64 varying_inputs )
 531 {
 532    if (ctx->varying_vp_inputs != varying_inputs) {
 533       ctx->varying_vp_inputs = varying_inputs;
 534
 535       /* Only the fixed-func generated programs need to use the flag
 536        * and the fixed-func fragment program uses it only if there is also
 537        * a fixed-func vertex program, so this only depends on the latter.
 538        *
 539        * It's okay to check the VP pointer here, because this is called after
 540        * _mesa_update_state in the vbo module. */
 541       if (ctx->VertexProgram._TnlProgram ||
 542           ctx->FragmentProgram._TexEnvProgram) {
 543          ctx->NewState |= _NEW_VARYING_VP_INPUTS;
 544       }
 545       /*printf("%s %x\n", __func__, varying_inputs);*/
 546    }
 547 }
 548
 549
 550 /**
 551  * Used by drivers to tell core Mesa that the driver is going to
 552  * install/ use its own vertex program.  In particular, this will
 553  * prevent generated fragment programs from using state vars instead
 554  * of ordinary varyings/inputs.
 555  */
 556 void
 557 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 558 {
 559    if (ctx->VertexProgram._Overriden != flag) {
 560       ctx->VertexProgram._Overriden = flag;
 561
 562       /* Set one of the bits which will trigger fragment program
 563        * regeneration:
 564        */
 565       ctx->NewState |= _NEW_PROGRAM;
 566    }
 567 }