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