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. Programs derived from fixed-function state.
 128     *
 129     * Note: it's possible for a vertex shader to get used with a fragment
 130     * program (and vice versa) here, but in practice that shouldn't ever
 131     * come up, or matter.
 132     */
 133
 134    if (fsProg && fsProg->LinkStatus
 135        && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {
 136       /* Use GLSL fragment shader */
 137       _mesa_reference_shader_program(ctx,
 138                                      &ctx->_Shader->_CurrentFragmentProgram,
 139                                      fsProg);
 140       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 141                                gl_fragment_program(fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));
 142       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 143                                NULL);
 144    }
 145    else if (ctx->FragmentProgram._Enabled) {
 146       /* Use user-defined fragment program */
 147       _mesa_reference_shader_program(ctx,
 148                                      &ctx->_Shader->_CurrentFragmentProgram,
 149                                      NULL);
 150       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 151                                ctx->FragmentProgram.Current);
 152       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 153                                NULL);
 154    }
 155    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 156       /* Use fragment program generated from fixed-function state */
 157       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 158
 159       _mesa_reference_shader_program(ctx,
 160                                      &ctx->_Shader->_CurrentFragmentProgram,
 161                                      f);
 162       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 163                                gl_fragment_program(f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));
 164       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 165                                gl_fragment_program(f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));
 166    }
 167    else {
 168       /* No fragment program */
 169       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 170       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 171                                NULL);
 172    }
 173
 174    if (gsProg && gsProg->LinkStatus
 175        && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {
 176       /* Use GLSL geometry shader */
 177       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 178                                gl_geometry_program(gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program));
 179    } else {
 180       /* No geometry program */
 181       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 182    }
 183
 184    if (tesProg && tesProg->LinkStatus
 185        && tesProg->_LinkedShaders[MESA_SHADER_TESS_EVAL]) {
 186       /* Use GLSL tessellation evaluation shader */
 187       _mesa_reference_tesseprog(ctx, &ctx->TessEvalProgram._Current,
 188          gl_tess_eval_program(
 189             tesProg->_LinkedShaders[MESA_SHADER_TESS_EVAL]->Program));
 190    }
 191    else {
 192       /* No tessellation evaluation program */
 193       _mesa_reference_tesseprog(ctx, &ctx->TessEvalProgram._Current, NULL);
 194    }
 195
 196    if (tcsProg && tcsProg->LinkStatus
 197        && tcsProg->_LinkedShaders[MESA_SHADER_TESS_CTRL]) {
 198       /* Use GLSL tessellation control shader */
 199       _mesa_reference_tesscprog(ctx, &ctx->TessCtrlProgram._Current,
 200          gl_tess_ctrl_program(
 201             tcsProg->_LinkedShaders[MESA_SHADER_TESS_CTRL]->Program));
 202    }
 203    else {
 204       /* No tessellation control program */
 205       _mesa_reference_tesscprog(ctx, &ctx->TessCtrlProgram._Current, NULL);
 206    }
 207
 208    /* Examine vertex program after fragment program as
 209     * _mesa_get_fixed_func_vertex_program() needs to know active
 210     * fragprog inputs.
 211     */
 212    if (vsProg && vsProg->LinkStatus
 213        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 214       /* Use GLSL vertex shader */
 215       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 216                                gl_vertex_program(vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program));
 217    }
 218    else if (ctx->VertexProgram._Enabled) {
 219       /* Use user-defined vertex program */
 220       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 221                                ctx->VertexProgram.Current);
 222    }
 223    else if (ctx->VertexProgram._MaintainTnlProgram) {
 224       /* Use vertex program generated from fixed-function state */
 225       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 226                                _mesa_get_fixed_func_vertex_program(ctx));
 227       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 228                                ctx->VertexProgram._Current);
 229    }
 230    else {
 231       /* no vertex program */
 232       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 233    }
 234
 235    if (csProg && csProg->LinkStatus
 236        && csProg->_LinkedShaders[MESA_SHADER_COMPUTE]) {
 237       /* Use GLSL compute shader */
 238       _mesa_reference_compprog(ctx, &ctx->ComputeProgram._Current,
 239                                gl_compute_program(csProg->_LinkedShaders[MESA_SHADER_COMPUTE]->Program));
 240    } else {
 241       /* no compute program */
 242       _mesa_reference_compprog(ctx, &ctx->ComputeProgram._Current, NULL);
 243    }
 244
 245    /* Let the driver know what's happening:
 246     */
 247    if (ctx->FragmentProgram._Current != prevFP) {
 248       new_state |= _NEW_PROGRAM;
 249       if (ctx->Driver.BindProgram) {
 250          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 251                           (struct gl_program *) ctx->FragmentProgram._Current);
 252       }
 253    }
 254
 255    if (ctx->GeometryProgram._Current != prevGP) {
 256       new_state |= _NEW_PROGRAM;
 257       if (ctx->Driver.BindProgram) {
 258          ctx->Driver.BindProgram(ctx, GL_GEOMETRY_PROGRAM_NV,
 259                             (struct gl_program *) ctx->GeometryProgram._Current);
 260       }
 261    }
 262
 263    if (ctx->TessEvalProgram._Current != prevTEP) {
 264       new_state |= _NEW_PROGRAM;
 265       if (ctx->Driver.BindProgram) {
 266          ctx->Driver.BindProgram(ctx, GL_TESS_EVALUATION_PROGRAM_NV,
 267                             (struct gl_program *) ctx->TessEvalProgram._Current);
 268       }
 269    }
 270
 271    if (ctx->TessCtrlProgram._Current != prevTCP) {
 272       new_state |= _NEW_PROGRAM;
 273       if (ctx->Driver.BindProgram) {
 274          ctx->Driver.BindProgram(ctx, GL_TESS_CONTROL_PROGRAM_NV,
 275                             (struct gl_program *) ctx->TessCtrlProgram._Current);
 276       }
 277    }
 278
 279    if (ctx->VertexProgram._Current != prevVP) {
 280       new_state |= _NEW_PROGRAM;
 281       if (ctx->Driver.BindProgram) {
 282          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 283                             (struct gl_program *) ctx->VertexProgram._Current);
 284       }
 285    }
 286
 287    if (ctx->ComputeProgram._Current != prevCP) {
 288       new_state |= _NEW_PROGRAM;
 289       if (ctx->Driver.BindProgram) {
 290          ctx->Driver.BindProgram(ctx, GL_COMPUTE_PROGRAM_NV,
 291                                  (struct gl_program *) ctx->ComputeProgram._Current);
 292       }
 293    }
 294
 295    return new_state;
 296 }
 297
 298
 299 /**
 300  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 301  */
 302 static GLbitfield
 303 update_program_constants(struct gl_context *ctx)
 304 {
 305    GLbitfield new_state = 0x0;
 306
 307    if (ctx->FragmentProgram._Current) {
 308       const struct gl_program_parameter_list *params =
 309          ctx->FragmentProgram._Current->Base.Parameters;
 310       if (params && params->StateFlags & ctx->NewState) {
 311          new_state |= _NEW_PROGRAM_CONSTANTS;
 312       }
 313    }
 314
 315    /* Don't handle tessellation and geometry shaders here. They don't use
 316     * any state constants.
 317     */
 318
 319    if (ctx->VertexProgram._Current) {
 320       const struct gl_program_parameter_list *params =
 321          ctx->VertexProgram._Current->Base.Parameters;
 322       if (params && params->StateFlags & ctx->NewState) {
 323          new_state |= _NEW_PROGRAM_CONSTANTS;
 324       }
 325    }
 326
 327    return new_state;
 328 }
 329
 330
 331
 332
 333 /**
 334  * Update the ctx->Polygon._FrontBit flag.
 335  */
 336 static void
 337 update_frontbit(struct gl_context *ctx)
 338 {
 339    if (ctx->Transform.ClipOrigin == GL_LOWER_LEFT)
 340       ctx->Polygon._FrontBit = (ctx->Polygon.FrontFace == GL_CW);
 341    else
 342       ctx->Polygon._FrontBit = (ctx->Polygon.FrontFace == GL_CCW);
 343 }
 344
 345
 346 /**
 347  * Update derived multisample state.
 348  */
 349 static void
 350 update_multisample(struct gl_context *ctx)
 351 {
 352    ctx->Multisample._Enabled = GL_FALSE;
 353    if (ctx->Multisample.Enabled &&
 354        ctx->DrawBuffer &&
 355        ctx->DrawBuffer->Visual.sampleBuffers)
 356       ctx->Multisample._Enabled = GL_TRUE;
 357 }
 358
 359
 360 /**
 361  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 362  */
 363 static void
 364 update_twoside(struct gl_context *ctx)
 365 {
 366    if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX] ||
 367        ctx->VertexProgram._Enabled) {
 368       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 369    } else {
 370       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 371                                             ctx->Light.Model.TwoSide);
 372    }
 373 }
 374
 375
 376 /**
 377  * Compute derived GL state.
 378  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 379  * be called before rendering anything.
 380  *
 381  * Calls dd_function_table::UpdateState to perform any internal state
 382  * management necessary.
 383  *
 384  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 385  * _mesa_update_buffer_bounds(),
 386  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 387  */
 388 void
 389 _mesa_update_state_locked( struct gl_context *ctx )
 390 {
 391    GLbitfield new_state = ctx->NewState;
 392    GLbitfield prog_flags = _NEW_PROGRAM;
 393    GLbitfield new_prog_state = 0x0;
 394    const GLbitfield computed_states = ~(_NEW_CURRENT_ATTRIB | _NEW_LINE);
 395
 396    /* we can skip a bunch of state validation checks if the dirty
 397     * state matches one or more bits in 'computed_states'.
 398     */
 399    if ((new_state & computed_states) == 0)
 400       goto out;
 401
 402    if (MESA_VERBOSE & VERBOSE_STATE)
 403       _mesa_print_state("_mesa_update_state", new_state);
 404
 405    /* Determine which state flags effect vertex/fragment program state */
 406    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 407       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 408                      _NEW_VARYING_VP_INPUTS | _NEW_LIGHT | _NEW_POINT |
 409                      _NEW_RENDERMODE | _NEW_PROGRAM | _NEW_FRAG_CLAMP |
 410                      _NEW_COLOR);
 411    }
 412    if (ctx->VertexProgram._MaintainTnlProgram) {
 413       prog_flags |= (_NEW_VARYING_VP_INPUTS | _NEW_TEXTURE |
 414                      _NEW_TEXTURE_MATRIX | _NEW_TRANSFORM | _NEW_POINT |
 415                      _NEW_FOG | _NEW_LIGHT |
 416                      _MESA_NEW_NEED_EYE_COORDS);
 417    }
 418
 419    /*
 420     * Now update derived state info
 421     */
 422
 423    if (new_state & prog_flags)
 424       update_program_enables( ctx );
 425
 426    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 427       _mesa_update_modelview_project( ctx, new_state );
 428
 429    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 430       _mesa_update_texture( ctx, new_state );
 431
 432    if (new_state & _NEW_POLYGON)
 433       update_frontbit( ctx );
 434
 435    if (new_state & _NEW_BUFFERS)
 436       _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
 437
 438    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 439       _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);
 440
 441    if (new_state & _NEW_LIGHT)
 442       _mesa_update_lighting( ctx );
 443
 444    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 445       update_twoside( ctx );
 446
 447    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 448       _mesa_update_stencil( ctx );
 449
 450    if (new_state & _NEW_PIXEL)
 451       _mesa_update_pixel( ctx, new_state );
 452
 453    if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))
 454       update_multisample( ctx );
 455
 456    /* ctx->_NeedEyeCoords is now up to date.
 457     *
 458     * If the truth value of this variable has changed, update for the
 459     * new lighting space and recompute the positions of lights and the
 460     * normal transform.
 461     *
 462     * If the lighting space hasn't changed, may still need to recompute
 463     * light positions & normal transforms for other reasons.
 464     */
 465    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 466       _mesa_update_tnl_spaces( ctx, new_state );
 467
 468    if (new_state & prog_flags) {
 469       /* When we generate programs from fixed-function vertex/fragment state
 470        * this call may generate/bind a new program.  If so, we need to
 471        * propogate the _NEW_PROGRAM flag to the driver.
 472        */
 473       new_prog_state |= update_program( ctx );
 474    }
 475
 476    if (new_state & _NEW_ARRAY)
 477       _mesa_update_vao_client_arrays(ctx, ctx->Array.VAO);
 478
 479  out:
 480    new_prog_state |= update_program_constants(ctx);
 481
 482    /*
 483     * Give the driver a chance to act upon the new_state flags.
 484     * The driver might plug in different span functions, for example.
 485     * Also, this is where the driver can invalidate the state of any
 486     * active modules (such as swrast_setup, swrast, tnl, etc).
 487     *
 488     * Set ctx->NewState to zero to avoid recursion if
 489     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 490     */
 491    new_state = ctx->NewState | new_prog_state;
 492    ctx->NewState = 0;
 493    ctx->Driver.UpdateState(ctx, new_state);
 494    ctx->Array.VAO->NewArrays = 0x0;
 495 }
 496
 497
 498 /* This is the usual entrypoint for state updates:
 499  */
 500 void
 501 _mesa_update_state( struct gl_context *ctx )
 502 {
 503    _mesa_lock_context_textures(ctx);
 504    _mesa_update_state_locked(ctx);
 505    _mesa_unlock_context_textures(ctx);
 506 }
 507
 508
 509
 510
 511 /**
 512  * Want to figure out which fragment program inputs are actually
 513  * constant/current values from ctx->Current.  These should be
 514  * referenced as a tracked state variable rather than a fragment
 515  * program input, to save the overhead of putting a constant value in
 516  * every submitted vertex, transferring it to hardware, interpolating
 517  * it across the triangle, etc...
 518  *
 519  * When there is a VP bound, just use vp->outputs.  But when we're
 520  * generating vp from fixed function state, basically want to
 521  * calculate:
 522  *
 523  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 524  *                 potential_vp_outputs )
 525  *
 526  * Where potential_vp_outputs is calculated by looking at enabled
 527  * texgen, etc.
 528  *
 529  * The generated fragment program should then only declare inputs that
 530  * may vary or otherwise differ from the ctx->Current values.
 531  * Otherwise, the fp should track them as state values instead.
 532  */
 533 void
 534 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 535                              GLbitfield64 varying_inputs )
 536 {
 537    if (ctx->varying_vp_inputs != varying_inputs) {
 538       ctx->varying_vp_inputs = varying_inputs;
 539
 540       /* Only the fixed-func generated programs need to use the flag
 541        * and the fixed-func fragment program uses it only if there is also
 542        * a fixed-func vertex program, so this only depends on the latter.
 543        *
 544        * It's okay to check the VP pointer here, because this is called after
 545        * _mesa_update_state in the vbo module. */
 546       if (ctx->VertexProgram._TnlProgram ||
 547           ctx->FragmentProgram._TexEnvProgram) {
 548          ctx->NewState |= _NEW_VARYING_VP_INPUTS;
 549       }
 550       /*printf("%s %x\n", __func__, varying_inputs);*/
 551    }
 552 }
 553
 554
 555 /**
 556  * Used by drivers to tell core Mesa that the driver is going to
 557  * install/ use its own vertex program.  In particular, this will
 558  * prevent generated fragment programs from using state vars instead
 559  * of ordinary varyings/inputs.
 560  */
 561 void
 562 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 563 {
 564    if (ctx->VertexProgram._Overriden != flag) {
 565       ctx->VertexProgram._Overriden = flag;
 566
 567       /* Set one of the bits which will trigger fragment program
 568        * regeneration:
 569        */
 570       ctx->NewState |= _NEW_PROGRAM;
 571    }
 572 }