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 GLcontext.
  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 #if FEATURE_pixel_transfer
  44 #include "pixel.h"
  45 #endif
  46 #include "shader/program.h"
  47 #include "shader/prog_parameter.h"
  48 #include "state.h"
  49 #include "stencil.h"
  50 #include "texenvprogram.h"
  51 #include "texobj.h"
  52 #include "texstate.h"
  53 #include "viewport.h"
  54
  55
  56 static void
  57 update_separate_specular(GLcontext *ctx)
  58 {
  59    if (NEED_SECONDARY_COLOR(ctx))
  60       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  61    else
  62       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  63 }
  64
  65
  66 /**
  67  * Compute the index of the last array element that can be safely accessed
  68  * in a vertex array.  We can really only do this when the array lives in
  69  * a VBO.
  70  * The array->_MaxElement field will be updated.
  71  * Later in glDrawArrays/Elements/etc we can do some bounds checking.
  72  */
  73 static void
  74 compute_max_element(struct gl_client_array *array)
  75 {
  76    assert(array->Enabled);
  77    if (array->BufferObj->Name) {
  78       GLsizeiptrARB offset = (GLsizeiptrARB) array->Ptr;
  79       GLsizeiptrARB obj_size = (GLsizeiptrARB) array->BufferObj->Size;
  80
  81       if (offset < obj_size) {
  82          array->_MaxElement = (obj_size - offset +
  83                                array->StrideB -
  84                                array->_ElementSize) / array->StrideB;
  85       } else {
  86          array->_MaxElement = 0;
  87       }
  88       /* Compute the max element we can access in the VBO without going
  89        * out of bounds.
  90        */
  91       array->_MaxElement = ((GLsizeiptrARB) array->BufferObj->Size
  92                             - (GLsizeiptrARB) array->Ptr + array->StrideB
  93                             - array->_ElementSize) / array->StrideB;
  94    }
  95    else {
  96       /* user-space array, no idea how big it is */
  97       array->_MaxElement = 2 * 1000 * 1000 * 1000; /* just a big number */
  98    }
  99 }
 100
 101
 102 /**
 103  * Helper for update_arrays().
 104  * \return  min(current min, array->_MaxElement).
 105  */
 106 static GLuint
 107 update_min(GLuint min, struct gl_client_array *array)
 108 {
 109    compute_max_element(array);
 110    return MIN2(min, array->_MaxElement);
 111 }
 112
 113
 114 /**
 115  * Update ctx->Array._MaxElement (the max legal index into all enabled arrays).
 116  * Need to do this upon new array state or new buffer object state.
 117  */
 118 static void
 119 update_arrays( GLcontext *ctx )
 120 {
 121    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
 122    GLuint i, min = ~0;
 123
 124    /* find min of _MaxElement values for all enabled arrays */
 125
 126    /* 0 */
 127    if (ctx->VertexProgram._Current
 128        && arrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
 129       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_POS]);
 130    }
 131    else if (arrayObj->Vertex.Enabled) {
 132       min = update_min(min, &arrayObj->Vertex);
 133    }
 134
 135    /* 1 */
 136    if (ctx->VertexProgram._Enabled
 137        && arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT].Enabled) {
 138       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_WEIGHT]);
 139    }
 140    /* no conventional vertex weight array */
 141
 142    /* 2 */
 143    if (ctx->VertexProgram._Enabled
 144        && arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
 145       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]);
 146    }
 147    else if (arrayObj->Normal.Enabled) {
 148       min = update_min(min, &arrayObj->Normal);
 149    }
 150
 151    /* 3 */
 152    if (ctx->VertexProgram._Enabled
 153        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 154       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]);
 155    }
 156    else if (arrayObj->Color.Enabled) {
 157       min = update_min(min, &arrayObj->Color);
 158    }
 159
 160    /* 4 */
 161    if (ctx->VertexProgram._Enabled
 162        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 163       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]);
 164    }
 165    else if (arrayObj->SecondaryColor.Enabled) {
 166       min = update_min(min, &arrayObj->SecondaryColor);
 167    }
 168
 169    /* 5 */
 170    if (ctx->VertexProgram._Enabled
 171        && arrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 172       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_FOG]);
 173    }
 174    else if (arrayObj->FogCoord.Enabled) {
 175       min = update_min(min, &arrayObj->FogCoord);
 176    }
 177
 178    /* 6 */
 179    if (ctx->VertexProgram._Enabled
 180        && arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 181       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]);
 182    }
 183    else if (arrayObj->Index.Enabled) {
 184       min = update_min(min, &arrayObj->Index);
 185    }
 186
 187    /* 7 */
 188    if (ctx->VertexProgram._Enabled
 189        && arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 190       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]);
 191    }
 192
 193    /* 8..15 */
 194    for (i = VERT_ATTRIB_TEX0; i <= VERT_ATTRIB_TEX7; i++) {
 195       if (ctx->VertexProgram._Enabled
 196           && arrayObj->VertexAttrib[i].Enabled) {
 197          min = update_min(min, &arrayObj->VertexAttrib[i]);
 198       }
 199       else if (i - VERT_ATTRIB_TEX0 < ctx->Const.MaxTextureCoordUnits
 200                && arrayObj->TexCoord[i - VERT_ATTRIB_TEX0].Enabled) {
 201          min = update_min(min, &arrayObj->TexCoord[i - VERT_ATTRIB_TEX0]);
 202       }
 203    }
 204
 205    /* 16..31 */
 206    if (ctx->VertexProgram._Current) {
 207       for (i = 0; i < Elements(arrayObj->VertexAttrib); i++) {
 208          if (arrayObj->VertexAttrib[i].Enabled) {
 209             min = update_min(min, &arrayObj->VertexAttrib[i]);
 210          }
 211       }
 212    }
 213
 214    if (arrayObj->EdgeFlag.Enabled) {
 215       min = update_min(min, &arrayObj->EdgeFlag);
 216    }
 217
 218    /* _MaxElement is one past the last legal array element */
 219    arrayObj->_MaxElement = min;
 220 }
 221
 222
 223 /**
 224  * Update the following fields:
 225  *   ctx->VertexProgram._Enabled
 226  *   ctx->FragmentProgram._Enabled
 227  *   ctx->ATIFragmentShader._Enabled
 228  * This needs to be done before texture state validation.
 229  */
 230 static void
 231 update_program_enables(GLcontext *ctx)
 232 {
 233    /* These _Enabled flags indicate if the program is enabled AND valid. */
 234    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 235       && ctx->VertexProgram.Current->Base.Instructions;
 236    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 237       && ctx->FragmentProgram.Current->Base.Instructions;
 238    ctx->ATIFragmentShader._Enabled = ctx->ATIFragmentShader.Enabled
 239       && ctx->ATIFragmentShader.Current->Instructions[0];
 240 }
 241
 242
 243 /**
 244  * Update vertex/fragment program state.  In particular, update these fields:
 245  *   ctx->VertexProgram._Current
 246  *   ctx->VertexProgram._TnlProgram,
 247  * These point to the highest priority enabled vertex/fragment program or are
 248  * NULL if fixed-function processing is to be done.
 249  *
 250  * This function needs to be called after texture state validation in case
 251  * we're generating a fragment program from fixed-function texture state.
 252  *
 253  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 254  * or fragment program is being used.
 255  */
 256 static GLbitfield
 257 update_program(GLcontext *ctx)
 258 {
 259    const struct gl_shader_program *shProg = ctx->Shader.CurrentProgram;
 260    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 261    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 262    GLbitfield new_state = 0x0;
 263
 264    /*
 265     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 266     * pointers to the programs that should be used for rendering.  If either
 267     * is NULL, use fixed-function code paths.
 268     *
 269     * These programs may come from several sources.  The priority is as
 270     * follows:
 271     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 272     *   2. ARB/NV vertex/fragment programs
 273     *   3. Programs derived from fixed-function state.
 274     *
 275     * Note: it's possible for a vertex shader to get used with a fragment
 276     * program (and vice versa) here, but in practice that shouldn't ever
 277     * come up, or matter.
 278     */
 279
 280    if (shProg && shProg->LinkStatus && shProg->FragmentProgram) {
 281       /* Use shader programs */
 282       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 283                                shProg->FragmentProgram);
 284    }
 285    else if (ctx->FragmentProgram._Enabled) {
 286       /* use user-defined vertex program */
 287       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 288                                ctx->FragmentProgram.Current);
 289    }
 290    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 291       /* Use fragment program generated from fixed-function state.
 292        */
 293       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 294                                _mesa_get_fixed_func_fragment_program(ctx));
 295       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 296                                ctx->FragmentProgram._Current);
 297    }
 298    else {
 299       /* no fragment program */
 300       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 301    }
 302
 303    /* Examine vertex program after fragment program as
 304     * _mesa_get_fixed_func_vertex_program() needs to know active
 305     * fragprog inputs.
 306     */
 307    if (shProg && shProg->LinkStatus && shProg->VertexProgram) {
 308       /* Use shader programs */
 309       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 310                             shProg->VertexProgram);
 311    }
 312    else if (ctx->VertexProgram._Enabled) {
 313       /* use user-defined vertex program */
 314       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 315                                ctx->VertexProgram.Current);
 316    }
 317    else if (ctx->VertexProgram._MaintainTnlProgram) {
 318       /* Use vertex program generated from fixed-function state.
 319        */
 320       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 321                                _mesa_get_fixed_func_vertex_program(ctx));
 322       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 323                                ctx->VertexProgram._Current);
 324    }
 325    else {
 326       /* no vertex program */
 327       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 328    }
 329
 330    /* Let the driver know what's happening:
 331     */
 332    if (ctx->FragmentProgram._Current != prevFP) {
 333       new_state |= _NEW_PROGRAM;
 334       if (ctx->Driver.BindProgram) {
 335          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 336                           (struct gl_program *) ctx->FragmentProgram._Current);
 337       }
 338    }
 339
 340    if (ctx->VertexProgram._Current != prevVP) {
 341       new_state |= _NEW_PROGRAM;
 342       if (ctx->Driver.BindProgram) {
 343          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 344                             (struct gl_program *) ctx->VertexProgram._Current);
 345       }
 346    }
 347
 348    return new_state;
 349 }
 350
 351
 352 /**
 353  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 354  */
 355 static GLbitfield
 356 update_program_constants(GLcontext *ctx)
 357 {
 358    GLbitfield new_state = 0x0;
 359
 360    if (ctx->FragmentProgram._Current) {
 361       const struct gl_program_parameter_list *params =
 362          ctx->FragmentProgram._Current->Base.Parameters;
 363       if (params && params->StateFlags & ctx->NewState) {
 364          new_state |= _NEW_PROGRAM_CONSTANTS;
 365       }
 366    }
 367
 368    if (ctx->VertexProgram._Current) {
 369       const struct gl_program_parameter_list *params =
 370          ctx->VertexProgram._Current->Base.Parameters;
 371       if (params && params->StateFlags & ctx->NewState) {
 372          new_state |= _NEW_PROGRAM_CONSTANTS;
 373       }
 374    }
 375
 376    return new_state;
 377 }
 378
 379
 380
 381
 382 static void
 383 update_viewport_matrix(GLcontext *ctx)
 384 {
 385    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 386
 387    ASSERT(depthMax > 0);
 388
 389    /* Compute scale and bias values. This is really driver-specific
 390     * and should be maintained elsewhere if at all.
 391     * NOTE: RasterPos uses this.
 392     */
 393    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 394                          ctx->Viewport.X, ctx->Viewport.Y,
 395                          ctx->Viewport.Width, ctx->Viewport.Height,
 396                          ctx->Viewport.Near, ctx->Viewport.Far,
 397                          depthMax);
 398 }
 399
 400
 401 /**
 402  * Update derived multisample state.
 403  */
 404 static void
 405 update_multisample(GLcontext *ctx)
 406 {
 407    ctx->Multisample._Enabled = GL_FALSE;
 408    if (ctx->Multisample.Enabled &&
 409        ctx->DrawBuffer &&
 410        ctx->DrawBuffer->Visual.sampleBuffers)
 411       ctx->Multisample._Enabled = GL_TRUE;
 412 }
 413
 414
 415 /**
 416  * Update derived color/blend/logicop state.
 417  */
 418 static void
 419 update_color(GLcontext *ctx)
 420 {
 421    /* This is needed to support 1.1's RGB logic ops AND
 422     * 1.0's blending logicops.
 423     */
 424    ctx->Color._LogicOpEnabled = RGBA_LOGICOP_ENABLED(ctx);
 425 }
 426
 427
 428 /*
 429  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 430  * in ctx->_TriangleCaps if needed.
 431  */
 432 static void
 433 update_polygon(GLcontext *ctx)
 434 {
 435    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 436
 437    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 438       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 439
 440    if (   ctx->Polygon.OffsetPoint
 441        || ctx->Polygon.OffsetLine
 442        || ctx->Polygon.OffsetFill)
 443       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 444 }
 445
 446
 447 /**
 448  * Update the ctx->_TriangleCaps bitfield.
 449  * XXX that bitfield should really go away someday!
 450  * This function must be called after other update_*() functions since
 451  * there are dependencies on some other derived values.
 452  */
 453 #if 0
 454 static void
 455 update_tricaps(GLcontext *ctx, GLbitfield new_state)
 456 {
 457    ctx->_TriangleCaps = 0;
 458
 459    /*
 460     * Points
 461     */
 462    if (1/*new_state & _NEW_POINT*/) {
 463       if (ctx->Point.SmoothFlag)
 464          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 465       if (ctx->Point.Size != 1.0F)
 466          ctx->_TriangleCaps |= DD_POINT_SIZE;
 467       if (ctx->Point._Attenuated)
 468          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 469    }
 470
 471    /*
 472     * Lines
 473     */
 474    if (1/*new_state & _NEW_LINE*/) {
 475       if (ctx->Line.SmoothFlag)
 476          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 477       if (ctx->Line.StippleFlag)
 478          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 479       if (ctx->Line.Width != 1.0)
 480          ctx->_TriangleCaps |= DD_LINE_WIDTH;
 481    }
 482
 483    /*
 484     * Polygons
 485     */
 486    if (1/*new_state & _NEW_POLYGON*/) {
 487       if (ctx->Polygon.SmoothFlag)
 488          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 489       if (ctx->Polygon.StippleFlag)
 490          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 491       if (ctx->Polygon.FrontMode != GL_FILL
 492           || ctx->Polygon.BackMode != GL_FILL)
 493          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 494       if (ctx->Polygon.CullFlag
 495           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 496          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 497       if (ctx->Polygon.OffsetPoint ||
 498           ctx->Polygon.OffsetLine ||
 499           ctx->Polygon.OffsetFill)
 500          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 501    }
 502
 503    /*
 504     * Lighting and shading
 505     */
 506    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 507       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 508    if (ctx->Light.ShadeModel == GL_FLAT)
 509       ctx->_TriangleCaps |= DD_FLATSHADE;
 510    if (NEED_SECONDARY_COLOR(ctx))
 511       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 512
 513    /*
 514     * Stencil
 515     */
 516    if (ctx->Stencil._TestTwoSide)
 517       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 518 }
 519 #endif
 520
 521
 522 /**
 523  * Compute derived GL state.
 524  * If __GLcontextRec::NewState is non-zero then this function \b must
 525  * be called before rendering anything.
 526  *
 527  * Calls dd_function_table::UpdateState to perform any internal state
 528  * management necessary.
 529  *
 530  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 531  * _mesa_update_buffer_bounds(),
 532  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 533  */
 534 void
 535 _mesa_update_state_locked( GLcontext *ctx )
 536 {
 537    GLbitfield new_state = ctx->NewState;
 538    GLbitfield prog_flags = _NEW_PROGRAM;
 539    GLbitfield new_prog_state = 0x0;
 540
 541    if (new_state == _NEW_CURRENT_ATTRIB)
 542       goto out;
 543
 544    if (MESA_VERBOSE & VERBOSE_STATE)
 545       _mesa_print_state("_mesa_update_state", new_state);
 546
 547    /* Determine which state flags effect vertex/fragment program state */
 548    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 549       prog_flags |= (_NEW_TEXTURE | _NEW_FOG |
 550                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 551                      _NEW_PROGRAM);
 552    }
 553    if (ctx->VertexProgram._MaintainTnlProgram) {
 554       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 555                      _NEW_TRANSFORM | _NEW_POINT |
 556                      _NEW_FOG | _NEW_LIGHT |
 557                      _MESA_NEW_NEED_EYE_COORDS);
 558    }
 559
 560    /*
 561     * Now update derived state info
 562     */
 563
 564    if (new_state & prog_flags)
 565       update_program_enables( ctx );
 566
 567    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 568       _mesa_update_modelview_project( ctx, new_state );
 569
 570    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 571       _mesa_update_texture( ctx, new_state );
 572
 573    if (new_state & _NEW_BUFFERS)
 574       _mesa_update_framebuffer(ctx);
 575
 576    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 577       _mesa_update_draw_buffer_bounds( ctx );
 578
 579    if (new_state & _NEW_POLYGON)
 580       update_polygon( ctx );
 581
 582    if (new_state & _NEW_LIGHT)
 583       _mesa_update_lighting( ctx );
 584
 585    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 586       _mesa_update_stencil( ctx );
 587
 588 #if FEATURE_pixel_transfer
 589    if (new_state & _MESA_NEW_TRANSFER_STATE)
 590       _mesa_update_pixel( ctx, new_state );
 591 #endif
 592
 593    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 594       update_separate_specular( ctx );
 595
 596    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 597       update_arrays( ctx );
 598
 599    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 600       update_viewport_matrix(ctx);
 601
 602    if (new_state & _NEW_MULTISAMPLE)
 603       update_multisample( ctx );
 604
 605    if (new_state & _NEW_COLOR)
 606       update_color( ctx );
 607
 608 #if 0
 609    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 610                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 611       update_tricaps( ctx, new_state );
 612 #endif
 613
 614    /* ctx->_NeedEyeCoords is now up to date.
 615     *
 616     * If the truth value of this variable has changed, update for the
 617     * new lighting space and recompute the positions of lights and the
 618     * normal transform.
 619     *
 620     * If the lighting space hasn't changed, may still need to recompute
 621     * light positions & normal transforms for other reasons.
 622     */
 623    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 624       _mesa_update_tnl_spaces( ctx, new_state );
 625
 626    if (new_state & prog_flags) {
 627       /* When we generate programs from fixed-function vertex/fragment state
 628        * this call may generate/bind a new program.  If so, we need to
 629        * propogate the _NEW_PROGRAM flag to the driver.
 630        */
 631       new_prog_state |= update_program( ctx );
 632    }
 633
 634
 635  out:
 636    new_prog_state |= update_program_constants(ctx);
 637
 638    /*
 639     * Give the driver a chance to act upon the new_state flags.
 640     * The driver might plug in different span functions, for example.
 641     * Also, this is where the driver can invalidate the state of any
 642     * active modules (such as swrast_setup, swrast, tnl, etc).
 643     *
 644     * Set ctx->NewState to zero to avoid recursion if
 645     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 646     */
 647    new_state = ctx->NewState | new_prog_state;
 648    ctx->NewState = 0;
 649    ctx->Driver.UpdateState(ctx, new_state);
 650    ctx->Array.NewState = 0;
 651 }
 652
 653
 654 /* This is the usual entrypoint for state updates:
 655  */
 656 void
 657 _mesa_update_state( GLcontext *ctx )
 658 {
 659    _mesa_lock_context_textures(ctx);
 660    _mesa_update_state_locked(ctx);
 661    _mesa_unlock_context_textures(ctx);
 662 }
 663
 664
 665
 666
 667 /**
 668  * Want to figure out which fragment program inputs are actually
 669  * constant/current values from ctx->Current.  These should be
 670  * referenced as a tracked state variable rather than a fragment
 671  * program input, to save the overhead of putting a constant value in
 672  * every submitted vertex, transferring it to hardware, interpolating
 673  * it across the triangle, etc...
 674  *
 675  * When there is a VP bound, just use vp->outputs.  But when we're
 676  * generating vp from fixed function state, basically want to
 677  * calculate:
 678  *
 679  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 680  *                 potential_vp_outputs )
 681  *
 682  * Where potential_vp_outputs is calculated by looking at enabled
 683  * texgen, etc.
 684  *
 685  * The generated fragment program should then only declare inputs that
 686  * may vary or otherwise differ from the ctx->Current values.
 687  * Otherwise, the fp should track them as state values instead.
 688  */
 689 void
 690 _mesa_set_varying_vp_inputs( GLcontext *ctx,
 691                              GLbitfield varying_inputs )
 692 {
 693    if (ctx->varying_vp_inputs != varying_inputs) {
 694       ctx->varying_vp_inputs = varying_inputs;
 695       ctx->NewState |= _NEW_ARRAY;
 696       /*_mesa_printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 697    }
 698 }
 699
 700
 701 /**
 702  * Used by drivers to tell core Mesa that the driver is going to
 703  * install/ use its own vertex program.  In particular, this will
 704  * prevent generated fragment programs from using state vars instead
 705  * of ordinary varyings/inputs.
 706  */
 707 void
 708 _mesa_set_vp_override(GLcontext *ctx, GLboolean flag)
 709 {
 710    if (ctx->VertexProgram._Overriden != flag) {
 711       ctx->VertexProgram._Overriden = flag;
 712
 713       /* Set one of the bits which will trigger fragment program
 714        * regeneration:
 715        */
 716       ctx->NewState |= _NEW_PROGRAM;
 717    }
 718 }