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 #include "blend.h"
  55
  56
  57 static void
  58 update_separate_specular(struct gl_context *ctx)
  59 {
  60    if (_mesa_need_secondary_color(ctx))
  61       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  62    else
  63       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  64 }
  65
  66
  67 /**
  68  * Update the following fields:
  69  *   ctx->VertexProgram._Enabled
  70  *   ctx->FragmentProgram._Enabled
  71  *   ctx->ATIFragmentShader._Enabled
  72  * This needs to be done before texture state validation.
  73  */
  74 static void
  75 update_program_enables(struct gl_context *ctx)
  76 {
  77    /* These _Enabled flags indicate if the user-defined ARB/NV vertex/fragment
  78     * program is enabled AND valid.  Similarly for ATI fragment shaders.
  79     * GLSL shaders not relevant here.
  80     */
  81    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
  82       && ctx->VertexProgram.Current->Base.Instructions;
  83    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
  84       && ctx->FragmentProgram.Current->Base.Instructions;
  85    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
  86       && ctx->ATIFragmentShader.Current->Instructions[0];
  87 }
  88
  89
  90 /**
  91  * Update the ctx->Vertex/Geometry/FragmentProgram._Current pointers to point
  92  * to the current/active programs.  Then call ctx->Driver.BindProgram() to
  93  * tell the driver which programs to use.
  94  *
  95  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
  96  * programs or programs derived from fixed-function state.
  97  *
  98  * This function needs to be called after texture state validation in case
  99  * we're generating a fragment program from fixed-function texture state.
 100  *
 101  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 102  * or fragment program is being used.
 103  */
 104 static GLbitfield
 105 update_program(struct gl_context *ctx)
 106 {
 107    const struct gl_shader_program *vsProg = ctx->Shader.CurrentVertexProgram;
 108    const struct gl_shader_program *gsProg = ctx->Shader.CurrentGeometryProgram;
 109    struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;
 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    GLbitfield new_state = 0x0;
 114
 115    /*
 116     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 117     * pointers to the programs that should be used for rendering.  If either
 118     * is NULL, use fixed-function code paths.
 119     *
 120     * These programs may come from several sources.  The priority is as
 121     * follows:
 122     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 123     *   2. ARB/NV vertex/fragment programs
 124     *   3. Programs derived from fixed-function state.
 125     *
 126     * Note: it's possible for a vertex shader to get used with a fragment
 127     * program (and vice versa) here, but in practice that shouldn't ever
 128     * come up, or matter.
 129     */
 130
 131    if (fsProg && fsProg->LinkStatus
 132        && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {
 133       /* Use GLSL fragment shader */
 134       _mesa_reference_shader_program(ctx,
 135                                      &ctx->Shader._CurrentFragmentProgram,
 136                                      fsProg);
 137       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 138                                gl_fragment_program(fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));
 139       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 140                                NULL);
 141    }
 142    else if (ctx->FragmentProgram._Enabled) {
 143       /* Use user-defined fragment program */
 144       _mesa_reference_shader_program(ctx,
 145                                      &ctx->Shader._CurrentFragmentProgram,
 146                                      NULL);
 147       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 148                                ctx->FragmentProgram.Current);
 149       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 150                                NULL);
 151    }
 152    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 153       /* Use fragment program generated from fixed-function state */
 154       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 155
 156       _mesa_reference_shader_program(ctx,
 157                                      &ctx->Shader._CurrentFragmentProgram,
 158                                      f);
 159       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 160                                gl_fragment_program(f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));
 161       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 162                                gl_fragment_program(f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program));
 163    }
 164    else {
 165       /* No fragment program */
 166       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 167       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 168                                NULL);
 169    }
 170
 171    if (gsProg && gsProg->LinkStatus
 172        && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {
 173       /* Use GLSL geometry shader */
 174       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 175                                gl_geometry_program(gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program));
 176    } else {
 177       /* No geometry program */
 178       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 179    }
 180
 181    /* Examine vertex program after fragment program as
 182     * _mesa_get_fixed_func_vertex_program() needs to know active
 183     * fragprog inputs.
 184     */
 185    if (vsProg && vsProg->LinkStatus
 186        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 187       /* Use GLSL vertex shader */
 188       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 189                                gl_vertex_program(vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program));
 190    }
 191    else if (ctx->VertexProgram._Enabled) {
 192       /* Use user-defined vertex program */
 193       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 194                                ctx->VertexProgram.Current);
 195    }
 196    else if (ctx->VertexProgram._MaintainTnlProgram) {
 197       /* Use vertex program generated from fixed-function state */
 198       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 199                                _mesa_get_fixed_func_vertex_program(ctx));
 200       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 201                                ctx->VertexProgram._Current);
 202    }
 203    else {
 204       /* no vertex program */
 205       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 206    }
 207
 208    /* Let the driver know what's happening:
 209     */
 210    if (ctx->FragmentProgram._Current != prevFP) {
 211       new_state |= _NEW_PROGRAM;
 212       if (ctx->Driver.BindProgram) {
 213          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 214                           (struct gl_program *) ctx->FragmentProgram._Current);
 215       }
 216    }
 217
 218    if (ctx->GeometryProgram._Current != prevGP) {
 219       new_state |= _NEW_PROGRAM;
 220       if (ctx->Driver.BindProgram) {
 221          ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,
 222                             (struct gl_program *) ctx->GeometryProgram._Current);
 223       }
 224    }
 225
 226    if (ctx->VertexProgram._Current != prevVP) {
 227       new_state |= _NEW_PROGRAM;
 228       if (ctx->Driver.BindProgram) {
 229          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 230                             (struct gl_program *) ctx->VertexProgram._Current);
 231       }
 232    }
 233
 234    return new_state;
 235 }
 236
 237
 238 /**
 239  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 240  */
 241 static GLbitfield
 242 update_program_constants(struct gl_context *ctx)
 243 {
 244    GLbitfield new_state = 0x0;
 245
 246    if (ctx->FragmentProgram._Current) {
 247       const struct gl_program_parameter_list *params =
 248          ctx->FragmentProgram._Current->Base.Parameters;
 249       if (params && params->StateFlags & ctx->NewState) {
 250          new_state |= _NEW_PROGRAM_CONSTANTS;
 251       }
 252    }
 253
 254    if (ctx->GeometryProgram._Current) {
 255       const struct gl_program_parameter_list *params =
 256          ctx->GeometryProgram._Current->Base.Parameters;
 257       /*FIXME: StateFlags is always 0 because we have unnamed constant
 258        *       not state changes */
 259       if (params /*&& params->StateFlags & ctx->NewState*/) {
 260          new_state |= _NEW_PROGRAM_CONSTANTS;
 261       }
 262    }
 263
 264    if (ctx->VertexProgram._Current) {
 265       const struct gl_program_parameter_list *params =
 266          ctx->VertexProgram._Current->Base.Parameters;
 267       if (params && params->StateFlags & ctx->NewState) {
 268          new_state |= _NEW_PROGRAM_CONSTANTS;
 269       }
 270    }
 271
 272    return new_state;
 273 }
 274
 275
 276
 277
 278 static void
 279 update_viewport_matrix(struct gl_context *ctx)
 280 {
 281    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 282
 283    ASSERT(depthMax > 0);
 284
 285    /* Compute scale and bias values. This is really driver-specific
 286     * and should be maintained elsewhere if at all.
 287     * NOTE: RasterPos uses this.
 288     */
 289    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 290                          ctx->Viewport.X, ctx->Viewport.Y,
 291                          ctx->Viewport.Width, ctx->Viewport.Height,
 292                          ctx->Viewport.Near, ctx->Viewport.Far,
 293                          depthMax);
 294 }
 295
 296
 297 /**
 298  * Update derived multisample state.
 299  */
 300 static void
 301 update_multisample(struct gl_context *ctx)
 302 {
 303    ctx->Multisample._Enabled = GL_FALSE;
 304    if (ctx->Multisample.Enabled &&
 305        ctx->DrawBuffer &&
 306        ctx->DrawBuffer->Visual.sampleBuffers)
 307       ctx->Multisample._Enabled = GL_TRUE;
 308 }
 309
 310
 311 /**
 312  * Update the ctx->Color._ClampFragmentColor field
 313  */
 314 static void
 315 update_clamp_fragment_color(struct gl_context *ctx)
 316 {
 317    struct gl_framebuffer *fb = ctx->DrawBuffer;
 318
 319    /* Don't clamp if:
 320     * - there is no colorbuffer
 321     * - all colorbuffers are unsigned normalized, so clamping has no effect
 322     * - there is an integer colorbuffer
 323     */
 324    if (!fb || !fb->_HasSNormOrFloatColorBuffer || fb->_IntegerColor)
 325       ctx->Color._ClampFragmentColor = GL_FALSE;
 326    else
 327       ctx->Color._ClampFragmentColor = _mesa_get_clamp_fragment_color(ctx);
 328 }
 329
 330
 331 /**
 332  * Update the ctx->Color._ClampVertexColor field
 333  */
 334 static void
 335 update_clamp_vertex_color(struct gl_context *ctx)
 336 {
 337    ctx->Light._ClampVertexColor = _mesa_get_clamp_vertex_color(ctx);
 338 }
 339
 340
 341 /**
 342  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 343  */
 344 static void
 345 update_twoside(struct gl_context *ctx)
 346 {
 347    if (ctx->Shader.CurrentVertexProgram ||
 348        ctx->VertexProgram._Enabled) {
 349       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 350    } else {
 351       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 352                                             ctx->Light.Model.TwoSide);
 353    }
 354 }
 355
 356
 357 /*
 358  * Check polygon state and set DD_TRI_OFFSET
 359  * in ctx->_TriangleCaps if needed.
 360  */
 361 static void
 362 update_polygon(struct gl_context *ctx)
 363 {
 364    ctx->_TriangleCaps &= ~DD_TRI_OFFSET;
 365
 366    if (   ctx->Polygon.OffsetPoint
 367        || ctx->Polygon.OffsetLine
 368        || ctx->Polygon.OffsetFill)
 369       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 370 }
 371
 372
 373 /**
 374  * Update the ctx->_TriangleCaps bitfield.
 375  * XXX that bitfield should really go away someday!
 376  * This function must be called after other update_*() functions since
 377  * there are dependencies on some other derived values.
 378  */
 379 #if 0
 380 static void
 381 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 382 {
 383    ctx->_TriangleCaps = 0;
 384
 385    /*
 386     * Points
 387     */
 388    if (1/*new_state & _NEW_POINT*/) {
 389       if (ctx->Point.SmoothFlag)
 390          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 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    }
 404
 405    /*
 406     * Polygons
 407     */
 408    if (1/*new_state & _NEW_POLYGON*/) {
 409       if (ctx->Polygon.SmoothFlag)
 410          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 411       if (ctx->Polygon.StippleFlag)
 412          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 413       if (ctx->Polygon.FrontMode != GL_FILL
 414           || ctx->Polygon.BackMode != GL_FILL)
 415          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 416       if (ctx->Polygon.OffsetPoint ||
 417           ctx->Polygon.OffsetLine ||
 418           ctx->Polygon.OffsetFill)
 419          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 420    }
 421
 422    /*
 423     * Lighting and shading
 424     */
 425    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 426       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 427    if (_mesa_need_secondary_color(ctx))
 428       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 429 }
 430 #endif
 431
 432
 433 /**
 434  * Compute derived GL state.
 435  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 436  * be called before rendering anything.
 437  *
 438  * Calls dd_function_table::UpdateState to perform any internal state
 439  * management necessary.
 440  *
 441  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 442  * _mesa_update_buffer_bounds(),
 443  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 444  */
 445 void
 446 _mesa_update_state_locked( struct gl_context *ctx )
 447 {
 448    GLbitfield new_state = ctx->NewState;
 449    GLbitfield prog_flags = _NEW_PROGRAM;
 450    GLbitfield new_prog_state = 0x0;
 451
 452    if (new_state == _NEW_CURRENT_ATTRIB)
 453       goto out;
 454
 455    if (MESA_VERBOSE & VERBOSE_STATE)
 456       _mesa_print_state("_mesa_update_state", new_state);
 457
 458    /* Determine which state flags effect vertex/fragment program state */
 459    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 460       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 461                      _NEW_VARYING_VP_INPUTS | _NEW_LIGHT | _NEW_POINT |
 462                      _NEW_RENDERMODE | _NEW_PROGRAM | _NEW_FRAG_CLAMP |
 463                      _NEW_COLOR);
 464    }
 465    if (ctx->VertexProgram._MaintainTnlProgram) {
 466       prog_flags |= (_NEW_VARYING_VP_INPUTS | _NEW_TEXTURE |
 467                      _NEW_TEXTURE_MATRIX | _NEW_TRANSFORM | _NEW_POINT |
 468                      _NEW_FOG | _NEW_LIGHT |
 469                      _MESA_NEW_NEED_EYE_COORDS);
 470    }
 471
 472    /*
 473     * Now update derived state info
 474     */
 475
 476    if (new_state & prog_flags)
 477       update_program_enables( ctx );
 478
 479    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 480       _mesa_update_modelview_project( ctx, new_state );
 481
 482    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 483       _mesa_update_texture( ctx, new_state );
 484
 485    if (new_state & _NEW_BUFFERS)
 486       _mesa_update_framebuffer(ctx);
 487
 488    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 489       _mesa_update_draw_buffer_bounds( ctx );
 490
 491    if (new_state & _NEW_POLYGON)
 492       update_polygon( ctx );
 493
 494    if (new_state & _NEW_LIGHT)
 495       _mesa_update_lighting( ctx );
 496
 497    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 498       update_twoside( ctx );
 499
 500    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 501       update_clamp_vertex_color(ctx);
 502
 503    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 504       _mesa_update_stencil( ctx );
 505
 506    if (new_state & _NEW_PIXEL)
 507       _mesa_update_pixel( ctx, new_state );
 508
 509    if (new_state & _MESA_NEW_SEPARATE_SPECULAR)
 510       update_separate_specular( ctx );
 511
 512    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 513       update_viewport_matrix(ctx);
 514
 515    if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))
 516       update_multisample( ctx );
 517
 518    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 519       update_clamp_fragment_color(ctx);
 520
 521 #if 0
 522    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 523                     | _NEW_STENCIL | _MESA_NEW_SEPARATE_SPECULAR))
 524       update_tricaps( ctx, new_state );
 525 #endif
 526
 527    /* ctx->_NeedEyeCoords is now up to date.
 528     *
 529     * If the truth value of this variable has changed, update for the
 530     * new lighting space and recompute the positions of lights and the
 531     * normal transform.
 532     *
 533     * If the lighting space hasn't changed, may still need to recompute
 534     * light positions & normal transforms for other reasons.
 535     */
 536    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 537       _mesa_update_tnl_spaces( ctx, new_state );
 538
 539    if (new_state & prog_flags) {
 540       /* When we generate programs from fixed-function vertex/fragment state
 541        * this call may generate/bind a new program.  If so, we need to
 542        * propogate the _NEW_PROGRAM flag to the driver.
 543        */
 544       new_prog_state |= update_program( ctx );
 545    }
 546
 547    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 548       _mesa_update_array_object_max_element(ctx, ctx->Array.ArrayObj);
 549
 550  out:
 551    new_prog_state |= update_program_constants(ctx);
 552
 553    /*
 554     * Give the driver a chance to act upon the new_state flags.
 555     * The driver might plug in different span functions, for example.
 556     * Also, this is where the driver can invalidate the state of any
 557     * active modules (such as swrast_setup, swrast, tnl, etc).
 558     *
 559     * Set ctx->NewState to zero to avoid recursion if
 560     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 561     */
 562    new_state = ctx->NewState | new_prog_state;
 563    ctx->NewState = 0;
 564    ctx->Driver.UpdateState(ctx, new_state);
 565    ctx->Array.ArrayObj->NewArrays = 0x0;
 566 }
 567
 568
 569 /* This is the usual entrypoint for state updates:
 570  */
 571 void
 572 _mesa_update_state( struct gl_context *ctx )
 573 {
 574    _mesa_lock_context_textures(ctx);
 575    _mesa_update_state_locked(ctx);
 576    _mesa_unlock_context_textures(ctx);
 577 }
 578
 579
 580
 581
 582 /**
 583  * Want to figure out which fragment program inputs are actually
 584  * constant/current values from ctx->Current.  These should be
 585  * referenced as a tracked state variable rather than a fragment
 586  * program input, to save the overhead of putting a constant value in
 587  * every submitted vertex, transferring it to hardware, interpolating
 588  * it across the triangle, etc...
 589  *
 590  * When there is a VP bound, just use vp->outputs.  But when we're
 591  * generating vp from fixed function state, basically want to
 592  * calculate:
 593  *
 594  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 595  *                 potential_vp_outputs )
 596  *
 597  * Where potential_vp_outputs is calculated by looking at enabled
 598  * texgen, etc.
 599  *
 600  * The generated fragment program should then only declare inputs that
 601  * may vary or otherwise differ from the ctx->Current values.
 602  * Otherwise, the fp should track them as state values instead.
 603  */
 604 void
 605 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 606                              GLbitfield64 varying_inputs )
 607 {
 608    if (ctx->varying_vp_inputs != varying_inputs) {
 609       ctx->varying_vp_inputs = varying_inputs;
 610
 611       /* Only the fixed-func generated programs need to use the flag
 612        * and the fixed-func fragment program uses it only if there is also
 613        * a fixed-func vertex program, so this only depends on the latter.
 614        *
 615        * It's okay to check the VP pointer here, because this is called after
 616        * _mesa_update_state in the vbo module. */
 617       if (ctx->VertexProgram._TnlProgram ||
 618           ctx->FragmentProgram._TexEnvProgram) {
 619          ctx->NewState |= _NEW_VARYING_VP_INPUTS;
 620       }
 621       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 622    }
 623 }
 624
 625
 626 /**
 627  * Used by drivers to tell core Mesa that the driver is going to
 628  * install/ use its own vertex program.  In particular, this will
 629  * prevent generated fragment programs from using state vars instead
 630  * of ordinary varyings/inputs.
 631  */
 632 void
 633 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 634 {
 635    if (ctx->VertexProgram._Overriden != flag) {
 636       ctx->VertexProgram._Overriden = flag;
 637
 638       /* Set one of the bits which will trigger fragment program
 639        * regeneration:
 640        */
 641       ctx->NewState |= _NEW_PROGRAM;
 642    }
 643 }