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 "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 #include "pixel.h"
  44 #include "program/program.h"
  45 #include "program/prog_parameter.h"
  46 #include "state.h"
  47 #include "stencil.h"
  48 #include "texenvprogram.h"
  49 #include "texobj.h"
  50 #include "texstate.h"
  51 #include "varray.h"
  52
  53
  54 static void
  55 update_separate_specular(struct gl_context *ctx)
  56 {
  57    if (_mesa_need_secondary_color(ctx))
  58       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  59    else
  60       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  61 }
  62
  63
  64 /**
  65  * Helper for update_arrays().
  66  * \return  min(current min, array->_MaxElement).
  67  */
  68 static GLuint
  69 update_min(GLuint min, struct gl_client_array *array)
  70 {
  71    _mesa_update_array_max_element(array);
  72    return MIN2(min, array->_MaxElement);
  73 }
  74
  75
  76 /**
  77  * Update ctx->Array._MaxElement (the max legal index into all enabled arrays).
  78  * Need to do this upon new array state or new buffer object state.
  79  */
  80 static void
  81 update_arrays( struct gl_context *ctx )
  82 {
  83    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
  84    GLuint i, min = ~0;
  85
  86    /* find min of _MaxElement values for all enabled arrays */
  87
  88    /* 0 */
  89    if (ctx->VertexProgram._Current
  90        && arrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
  91       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_POS]);
  92    }
  93    else if (arrayObj->Vertex.Enabled) {
  94       min = update_min(min, &arrayObj->Vertex);
  95    }
  96
  97    /* 1 */
  98    if (ctx->VertexProgram._Enabled
  99        && arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT].Enabled) {
 100       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT]);
 101    }
 102    /* no conventional vertex weight array */
 103
 104    /* 2 */
 105    if (ctx->VertexProgram._Enabled
 106        && arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
 107       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]);
 108    }
 109    else if (arrayObj->Normal.Enabled) {
 110       min = update_min(min, &arrayObj->Normal);
 111    }
 112
 113    /* 3 */
 114    if (ctx->VertexProgram._Enabled
 115        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 116       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]);
 117    }
 118    else if (arrayObj->Color.Enabled) {
 119       min = update_min(min, &arrayObj->Color);
 120    }
 121
 122    /* 4 */
 123    if (ctx->VertexProgram._Enabled
 124        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 125       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]);
 126    }
 127    else if (arrayObj->SecondaryColor.Enabled) {
 128       min = update_min(min, &arrayObj->SecondaryColor);
 129    }
 130
 131    /* 5 */
 132    if (ctx->VertexProgram._Enabled
 133        && arrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 134       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_FOG]);
 135    }
 136    else if (arrayObj->FogCoord.Enabled) {
 137       min = update_min(min, &arrayObj->FogCoord);
 138    }
 139
 140    /* 6 */
 141    if (ctx->VertexProgram._Enabled
 142        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 143       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]);
 144    }
 145    else if (arrayObj->Index.Enabled) {
 146       min = update_min(min, &arrayObj->Index);
 147    }
 148
 149    /* 7 */
 150    if (ctx->VertexProgram._Enabled
 151        && arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 152       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]);
 153    }
 154
 155    /* 8..15 */
 156    for (i = VERT_ATTRIB_TEX0; i <= VERT_ATTRIB_TEX7; i++) {
 157       if (ctx->VertexProgram._Enabled
 158           && arrayObj->VertexAttrib[i].Enabled) {
 159          min = update_min(min, &arrayObj->VertexAttrib[i]);
 160       }
 161       else if (i - VERT_ATTRIB_TEX0 < ctx->Const.MaxTextureCoordUnits
 162                && arrayObj->TexCoord[i - VERT_ATTRIB_TEX0].Enabled) {
 163          min = update_min(min, &arrayObj->TexCoord[i - VERT_ATTRIB_TEX0]);
 164       }
 165    }
 166
 167    /* 16..31 */
 168    if (ctx->VertexProgram._Current) {
 169       for (i = 0; i < Elements(arrayObj->VertexAttrib); i++) {
 170          if (arrayObj->VertexAttrib[i].Enabled) {
 171             min = update_min(min, &arrayObj->VertexAttrib[i]);
 172          }
 173       }
 174    }
 175
 176    if (arrayObj->EdgeFlag.Enabled) {
 177       min = update_min(min, &arrayObj->EdgeFlag);
 178    }
 179
 180    /* _MaxElement is one past the last legal array element */
 181    arrayObj->_MaxElement = min;
 182 }
 183
 184
 185 /**
 186  * Update the following fields:
 187  *   ctx->VertexProgram._Enabled
 188  *   ctx->FragmentProgram._Enabled
 189  *   ctx->ATIFragmentShader._Enabled
 190  * This needs to be done before texture state validation.
 191  */
 192 static void
 193 update_program_enables(struct gl_context *ctx)
 194 {
 195    /* These _Enabled flags indicate if the user-defined ARB/NV vertex/fragment
 196     * program is enabled AND valid.  Similarly for ATI fragment shaders.
 197     * GLSL shaders not relevant here.
 198     */
 199    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 200       && ctx->VertexProgram.Current->Base.Instructions;
 201    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 202       && ctx->FragmentProgram.Current->Base.Instructions;
 203    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
 204       && ctx->ATIFragmentShader.Current->Instructions[0];
 205 }
 206
 207
 208 /**
 209  * Update the ctx->Vertex/Geometry/FragmentProgram._Current pointers to point
 210  * to the current/active programs.  Then call ctx->Driver.BindProgram() to
 211  * tell the driver which programs to use.
 212  *
 213  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
 214  * programs or programs derived from fixed-function state.
 215  *
 216  * This function needs to be called after texture state validation in case
 217  * we're generating a fragment program from fixed-function texture state.
 218  *
 219  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 220  * or fragment program is being used.
 221  */
 222 static GLbitfield
 223 update_program(struct gl_context *ctx)
 224 {
 225    const struct gl_shader_program *vsProg = ctx->Shader.CurrentVertexProgram;
 226    const struct gl_shader_program *gsProg = ctx->Shader.CurrentGeometryProgram;
 227    const struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;
 228    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 229    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 230    const struct gl_geometry_program *prevGP = ctx->GeometryProgram._Current;
 231    GLbitfield new_state = 0x0;
 232
 233    /*
 234     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 235     * pointers to the programs that should be used for rendering.  If either
 236     * is NULL, use fixed-function code paths.
 237     *
 238     * These programs may come from several sources.  The priority is as
 239     * follows:
 240     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 241     *   2. ARB/NV vertex/fragment programs
 242     *   3. Programs derived from fixed-function state.
 243     *
 244     * Note: it's possible for a vertex shader to get used with a fragment
 245     * program (and vice versa) here, but in practice that shouldn't ever
 246     * come up, or matter.
 247     */
 248
 249    if (fsProg && fsProg->LinkStatus && fsProg->FragmentProgram) {
 250       /* Use GLSL fragment shader */
 251       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 252                                fsProg->FragmentProgram);
 253    }
 254    else if (ctx->FragmentProgram._Enabled) {
 255       /* Use user-defined fragment program */
 256       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 257                                ctx->FragmentProgram.Current);
 258    }
 259    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 260       /* Use fragment program generated from fixed-function state */
 261       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 262                                _mesa_get_fixed_func_fragment_program(ctx));
 263       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 264                                ctx->FragmentProgram._Current);
 265    }
 266    else {
 267       /* No fragment program */
 268       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 269    }
 270
 271    if (gsProg && gsProg->LinkStatus && gsProg->GeometryProgram) {
 272       /* Use GLSL geometry shader */
 273       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 274                                gsProg->GeometryProgram);
 275    } else {
 276       /* No geometry program */
 277       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 278    }
 279
 280    /* Examine vertex program after fragment program as
 281     * _mesa_get_fixed_func_vertex_program() needs to know active
 282     * fragprog inputs.
 283     */
 284    if (vsProg && vsProg->LinkStatus && vsProg->VertexProgram) {
 285       /* Use GLSL vertex shader */
 286       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 287                                vsProg->VertexProgram);
 288    }
 289    else if (ctx->VertexProgram._Enabled) {
 290       /* Use user-defined vertex program */
 291       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 292                                ctx->VertexProgram.Current);
 293    }
 294    else if (ctx->VertexProgram._MaintainTnlProgram) {
 295       /* Use vertex program generated from fixed-function state */
 296       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 297                                _mesa_get_fixed_func_vertex_program(ctx));
 298       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 299                                ctx->VertexProgram._Current);
 300    }
 301    else {
 302       /* no vertex program */
 303       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 304    }
 305
 306    /* Let the driver know what's happening:
 307     */
 308    if (ctx->FragmentProgram._Current != prevFP) {
 309       new_state |= _NEW_PROGRAM;
 310       if (ctx->Driver.BindProgram) {
 311          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 312                           (struct gl_program *) ctx->FragmentProgram._Current);
 313       }
 314    }
 315
 316    if (ctx->GeometryProgram._Current != prevGP) {
 317       new_state |= _NEW_PROGRAM;
 318       if (ctx->Driver.BindProgram) {
 319          ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,
 320                             (struct gl_program *) ctx->GeometryProgram._Current);
 321       }
 322    }
 323
 324    if (ctx->VertexProgram._Current != prevVP) {
 325       new_state |= _NEW_PROGRAM;
 326       if (ctx->Driver.BindProgram) {
 327          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 328                             (struct gl_program *) ctx->VertexProgram._Current);
 329       }
 330    }
 331
 332    return new_state;
 333 }
 334
 335
 336 /**
 337  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 338  */
 339 static GLbitfield
 340 update_program_constants(struct gl_context *ctx)
 341 {
 342    GLbitfield new_state = 0x0;
 343
 344    if (ctx->FragmentProgram._Current) {
 345       const struct gl_program_parameter_list *params =
 346          ctx->FragmentProgram._Current->Base.Parameters;
 347       if (params && params->StateFlags & ctx->NewState) {
 348          new_state |= _NEW_PROGRAM_CONSTANTS;
 349       }
 350    }
 351
 352    if (ctx->GeometryProgram._Current) {
 353       const struct gl_program_parameter_list *params =
 354          ctx->GeometryProgram._Current->Base.Parameters;
 355       /*FIXME: StateFlags is always 0 because we have unnamed constant
 356        *       not state changes */
 357       if (params /*&& params->StateFlags & ctx->NewState*/) {
 358          new_state |= _NEW_PROGRAM_CONSTANTS;
 359       }
 360    }
 361
 362    if (ctx->VertexProgram._Current) {
 363       const struct gl_program_parameter_list *params =
 364          ctx->VertexProgram._Current->Base.Parameters;
 365       if (params && params->StateFlags & ctx->NewState) {
 366          new_state |= _NEW_PROGRAM_CONSTANTS;
 367       }
 368    }
 369
 370    return new_state;
 371 }
 372
 373
 374
 375
 376 static void
 377 update_viewport_matrix(struct gl_context *ctx)
 378 {
 379    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 380
 381    ASSERT(depthMax > 0);
 382
 383    /* Compute scale and bias values. This is really driver-specific
 384     * and should be maintained elsewhere if at all.
 385     * NOTE: RasterPos uses this.
 386     */
 387    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 388                          ctx->Viewport.X, ctx->Viewport.Y,
 389                          ctx->Viewport.Width, ctx->Viewport.Height,
 390                          ctx->Viewport.Near, ctx->Viewport.Far,
 391                          depthMax);
 392 }
 393
 394
 395 /**
 396  * Update derived multisample state.
 397  */
 398 static void
 399 update_multisample(struct gl_context *ctx)
 400 {
 401    ctx->Multisample._Enabled = GL_FALSE;
 402    if (ctx->Multisample.Enabled &&
 403        ctx->DrawBuffer &&
 404        ctx->DrawBuffer->Visual.sampleBuffers)
 405       ctx->Multisample._Enabled = GL_TRUE;
 406 }
 407
 408
 409 /**
 410  * Update derived color/blend/logicop state.
 411  */
 412 static void
 413 update_color(struct gl_context *ctx)
 414 {
 415    /* This is needed to support 1.1's RGB logic ops AND
 416     * 1.0's blending logicops.
 417     */
 418    ctx->Color._LogicOpEnabled = _mesa_rgba_logicop_enabled(ctx);
 419 }
 420
 421
 422 /**
 423  * Update the ctx->Color._ClampFragmentColor field
 424  */
 425 static void
 426 update_clamp_fragment_color(struct gl_context *ctx)
 427 {
 428    if (ctx->Color.ClampFragmentColor == GL_FIXED_ONLY_ARB)
 429       ctx->Color._ClampFragmentColor =
 430          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 431    else
 432       ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
 433 }
 434
 435
 436 /**
 437  * Update the ctx->Color._ClampVertexColor field
 438  */
 439 static void
 440 update_clamp_vertex_color(struct gl_context *ctx)
 441 {
 442    if (ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
 443       ctx->Light._ClampVertexColor =
 444          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 445    else
 446       ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
 447 }
 448
 449
 450 /**
 451  * Update the ctx->Color._ClampReadColor field
 452  */
 453 static void
 454 update_clamp_read_color(struct gl_context *ctx)
 455 {
 456    if (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
 457       ctx->Color._ClampReadColor =
 458          !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
 459    else
 460       ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
 461 }
 462
 463
 464
 465
 466 /*
 467  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 468  * in ctx->_TriangleCaps if needed.
 469  */
 470 static void
 471 update_polygon(struct gl_context *ctx)
 472 {
 473    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 474
 475    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 476       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 477
 478    if (   ctx->Polygon.OffsetPoint
 479        || ctx->Polygon.OffsetLine
 480        || ctx->Polygon.OffsetFill)
 481       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 482 }
 483
 484
 485 /**
 486  * Update the ctx->_TriangleCaps bitfield.
 487  * XXX that bitfield should really go away someday!
 488  * This function must be called after other update_*() functions since
 489  * there are dependencies on some other derived values.
 490  */
 491 #if 0
 492 static void
 493 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 494 {
 495    ctx->_TriangleCaps = 0;
 496
 497    /*
 498     * Points
 499     */
 500    if (1/*new_state & _NEW_POINT*/) {
 501       if (ctx->Point.SmoothFlag)
 502          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 503       if (ctx->Point._Attenuated)
 504          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 505    }
 506
 507    /*
 508     * Lines
 509     */
 510    if (1/*new_state & _NEW_LINE*/) {
 511       if (ctx->Line.SmoothFlag)
 512          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 513       if (ctx->Line.StippleFlag)
 514          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 515    }
 516
 517    /*
 518     * Polygons
 519     */
 520    if (1/*new_state & _NEW_POLYGON*/) {
 521       if (ctx->Polygon.SmoothFlag)
 522          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 523       if (ctx->Polygon.StippleFlag)
 524          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 525       if (ctx->Polygon.FrontMode != GL_FILL
 526           || ctx->Polygon.BackMode != GL_FILL)
 527          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 528       if (ctx->Polygon.CullFlag
 529           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 530          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 531       if (ctx->Polygon.OffsetPoint ||
 532           ctx->Polygon.OffsetLine ||
 533           ctx->Polygon.OffsetFill)
 534          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 535    }
 536
 537    /*
 538     * Lighting and shading
 539     */
 540    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 541       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 542    if (ctx->Light.ShadeModel == GL_FLAT)
 543       ctx->_TriangleCaps |= DD_FLATSHADE;
 544    if (_mesa_need_secondary_color(ctx))
 545       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 546
 547    /*
 548     * Stencil
 549     */
 550    if (ctx->Stencil._TestTwoSide)
 551       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 552 }
 553 #endif
 554
 555
 556 /**
 557  * Compute derived GL state.
 558  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 559  * be called before rendering anything.
 560  *
 561  * Calls dd_function_table::UpdateState to perform any internal state
 562  * management necessary.
 563  *
 564  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 565  * _mesa_update_buffer_bounds(),
 566  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 567  */
 568 void
 569 _mesa_update_state_locked( struct gl_context *ctx )
 570 {
 571    GLbitfield new_state = ctx->NewState;
 572    GLbitfield prog_flags = _NEW_PROGRAM;
 573    GLbitfield new_prog_state = 0x0;
 574
 575    if (new_state == _NEW_CURRENT_ATTRIB)
 576       goto out;
 577
 578    if (MESA_VERBOSE & VERBOSE_STATE)
 579       _mesa_print_state("_mesa_update_state", new_state);
 580
 581    /* Determine which state flags effect vertex/fragment program state */
 582    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 583       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 584                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 585                      _NEW_PROGRAM | _NEW_FRAG_CLAMP);
 586    }
 587    if (ctx->VertexProgram._MaintainTnlProgram) {
 588       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 589                      _NEW_TRANSFORM | _NEW_POINT |
 590                      _NEW_FOG | _NEW_LIGHT |
 591                      _MESA_NEW_NEED_EYE_COORDS);
 592    }
 593
 594    /*
 595     * Now update derived state info
 596     */
 597
 598    if (new_state & prog_flags)
 599       update_program_enables( ctx );
 600
 601    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 602       _mesa_update_modelview_project( ctx, new_state );
 603
 604    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 605       _mesa_update_texture( ctx, new_state );
 606
 607    if (new_state & _NEW_BUFFERS)
 608       _mesa_update_framebuffer(ctx);
 609
 610    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 611       _mesa_update_draw_buffer_bounds( ctx );
 612
 613    if (new_state & _NEW_POLYGON)
 614       update_polygon( ctx );
 615
 616    if (new_state & _NEW_LIGHT)
 617       _mesa_update_lighting( ctx );
 618
 619    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 620       update_clamp_vertex_color(ctx);
 621
 622    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 623       _mesa_update_stencil( ctx );
 624
 625    if (new_state & _NEW_PIXEL)
 626       _mesa_update_pixel( ctx, new_state );
 627
 628    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 629       update_separate_specular( ctx );
 630
 631    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 632       update_viewport_matrix(ctx);
 633
 634    if (new_state & _NEW_MULTISAMPLE)
 635       update_multisample( ctx );
 636
 637    if (new_state & _NEW_COLOR)
 638       update_color( ctx );
 639
 640    if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
 641       update_clamp_read_color(ctx);
 642
 643    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 644       update_clamp_fragment_color(ctx);
 645
 646 #if 0
 647    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 648                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 649       update_tricaps( ctx, new_state );
 650 #endif
 651
 652    /* ctx->_NeedEyeCoords is now up to date.
 653     *
 654     * If the truth value of this variable has changed, update for the
 655     * new lighting space and recompute the positions of lights and the
 656     * normal transform.
 657     *
 658     * If the lighting space hasn't changed, may still need to recompute
 659     * light positions & normal transforms for other reasons.
 660     */
 661    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 662       _mesa_update_tnl_spaces( ctx, new_state );
 663
 664    if (new_state & prog_flags) {
 665       /* When we generate programs from fixed-function vertex/fragment state
 666        * this call may generate/bind a new program.  If so, we need to
 667        * propogate the _NEW_PROGRAM flag to the driver.
 668        */
 669       new_prog_state |= update_program( ctx );
 670    }
 671
 672    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 673       update_arrays( ctx );
 674
 675  out:
 676    new_prog_state |= update_program_constants(ctx);
 677
 678    /*
 679     * Give the driver a chance to act upon the new_state flags.
 680     * The driver might plug in different span functions, for example.
 681     * Also, this is where the driver can invalidate the state of any
 682     * active modules (such as swrast_setup, swrast, tnl, etc).
 683     *
 684     * Set ctx->NewState to zero to avoid recursion if
 685     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 686     */
 687    new_state = ctx->NewState | new_prog_state;
 688    ctx->NewState = 0;
 689    ctx->Driver.UpdateState(ctx, new_state);
 690    ctx->Array.NewState = 0;
 691    if (!ctx->Array.RebindArrays)
 692       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 693 }
 694
 695
 696 /* This is the usual entrypoint for state updates:
 697  */
 698 void
 699 _mesa_update_state( struct gl_context *ctx )
 700 {
 701    _mesa_lock_context_textures(ctx);
 702    _mesa_update_state_locked(ctx);
 703    _mesa_unlock_context_textures(ctx);
 704 }
 705
 706
 707
 708
 709 /**
 710  * Want to figure out which fragment program inputs are actually
 711  * constant/current values from ctx->Current.  These should be
 712  * referenced as a tracked state variable rather than a fragment
 713  * program input, to save the overhead of putting a constant value in
 714  * every submitted vertex, transferring it to hardware, interpolating
 715  * it across the triangle, etc...
 716  *
 717  * When there is a VP bound, just use vp->outputs.  But when we're
 718  * generating vp from fixed function state, basically want to
 719  * calculate:
 720  *
 721  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 722  *                 potential_vp_outputs )
 723  *
 724  * Where potential_vp_outputs is calculated by looking at enabled
 725  * texgen, etc.
 726  *
 727  * The generated fragment program should then only declare inputs that
 728  * may vary or otherwise differ from the ctx->Current values.
 729  * Otherwise, the fp should track them as state values instead.
 730  */
 731 void
 732 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 733                              GLbitfield varying_inputs )
 734 {
 735    if (ctx->varying_vp_inputs != varying_inputs) {
 736       ctx->varying_vp_inputs = varying_inputs;
 737       ctx->NewState |= _NEW_ARRAY;
 738       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 739    }
 740 }
 741
 742
 743 /**
 744  * Used by drivers to tell core Mesa that the driver is going to
 745  * install/ use its own vertex program.  In particular, this will
 746  * prevent generated fragment programs from using state vars instead
 747  * of ordinary varyings/inputs.
 748  */
 749 void
 750 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 751 {
 752    if (ctx->VertexProgram._Overriden != flag) {
 753       ctx->VertexProgram._Overriden = flag;
 754
 755       /* Set one of the bits which will trigger fragment program
 756        * regeneration:
 757        */
 758       ctx->NewState |= _NEW_PROGRAM;
 759    }
 760 }