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
 250        && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {
 251       /* Use GLSL fragment shader */
 252       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 253                                (struct gl_fragment_program *)
 254                                fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 255    }
 256    else if (ctx->FragmentProgram._Enabled) {
 257       /* Use user-defined fragment program */
 258       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 259                                ctx->FragmentProgram.Current);
 260    }
 261    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 262       /* Use fragment program generated from fixed-function state */
 263       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 264                                _mesa_get_fixed_func_fragment_program(ctx));
 265       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 266                                ctx->FragmentProgram._Current);
 267    }
 268    else {
 269       /* No fragment program */
 270       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 271    }
 272
 273    if (gsProg && gsProg->LinkStatus
 274        && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {
 275       /* Use GLSL geometry shader */
 276       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 277                                (struct gl_geometry_program *)
 278                                gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program);
 279    } else {
 280       /* No geometry program */
 281       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 282    }
 283
 284    /* Examine vertex program after fragment program as
 285     * _mesa_get_fixed_func_vertex_program() needs to know active
 286     * fragprog inputs.
 287     */
 288    if (vsProg && vsProg->LinkStatus
 289        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 290       /* Use GLSL vertex shader */
 291       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 292                                (struct gl_vertex_program *)
 293                                vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program);
 294    }
 295    else if (ctx->VertexProgram._Enabled) {
 296       /* Use user-defined vertex program */
 297       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 298                                ctx->VertexProgram.Current);
 299    }
 300    else if (ctx->VertexProgram._MaintainTnlProgram) {
 301       /* Use vertex program generated from fixed-function state */
 302       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 303                                _mesa_get_fixed_func_vertex_program(ctx));
 304       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 305                                ctx->VertexProgram._Current);
 306    }
 307    else {
 308       /* no vertex program */
 309       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 310    }
 311
 312    /* Let the driver know what's happening:
 313     */
 314    if (ctx->FragmentProgram._Current != prevFP) {
 315       new_state |= _NEW_PROGRAM;
 316       if (ctx->Driver.BindProgram) {
 317          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 318                           (struct gl_program *) ctx->FragmentProgram._Current);
 319       }
 320    }
 321
 322    if (ctx->GeometryProgram._Current != prevGP) {
 323       new_state |= _NEW_PROGRAM;
 324       if (ctx->Driver.BindProgram) {
 325          ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,
 326                             (struct gl_program *) ctx->GeometryProgram._Current);
 327       }
 328    }
 329
 330    if (ctx->VertexProgram._Current != prevVP) {
 331       new_state |= _NEW_PROGRAM;
 332       if (ctx->Driver.BindProgram) {
 333          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 334                             (struct gl_program *) ctx->VertexProgram._Current);
 335       }
 336    }
 337
 338    return new_state;
 339 }
 340
 341
 342 /**
 343  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 344  */
 345 static GLbitfield
 346 update_program_constants(struct gl_context *ctx)
 347 {
 348    GLbitfield new_state = 0x0;
 349
 350    if (ctx->FragmentProgram._Current) {
 351       const struct gl_program_parameter_list *params =
 352          ctx->FragmentProgram._Current->Base.Parameters;
 353       if (params && params->StateFlags & ctx->NewState) {
 354          new_state |= _NEW_PROGRAM_CONSTANTS;
 355       }
 356    }
 357
 358    if (ctx->GeometryProgram._Current) {
 359       const struct gl_program_parameter_list *params =
 360          ctx->GeometryProgram._Current->Base.Parameters;
 361       /*FIXME: StateFlags is always 0 because we have unnamed constant
 362        *       not state changes */
 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(struct gl_context *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(struct gl_context *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 the ctx->Color._ClampFragmentColor field
 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 =
 423          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 424    else
 425       ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
 426 }
 427
 428
 429 /**
 430  * Update the ctx->Color._ClampVertexColor field
 431  */
 432 static void
 433 update_clamp_vertex_color(struct gl_context *ctx)
 434 {
 435    if (ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
 436       ctx->Light._ClampVertexColor =
 437          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 438    else
 439       ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
 440 }
 441
 442
 443 /**
 444  * Update the ctx->Color._ClampReadColor field
 445  */
 446 static void
 447 update_clamp_read_color(struct gl_context *ctx)
 448 {
 449    if (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
 450       ctx->Color._ClampReadColor =
 451          !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
 452    else
 453       ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
 454 }
 455
 456 /**
 457  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 458  */
 459 static void
 460 update_twoside(struct gl_context *ctx)
 461 {
 462    if (ctx->Shader.CurrentVertexProgram ||
 463        ctx->VertexProgram.Current) {
 464       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 465    } else {
 466       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 467                                             ctx->Light.Model.TwoSide);
 468    }
 469 }
 470
 471
 472 /*
 473  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 474  * in ctx->_TriangleCaps if needed.
 475  */
 476 static void
 477 update_polygon(struct gl_context *ctx)
 478 {
 479    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 480
 481    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 482       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 483
 484    if (   ctx->Polygon.OffsetPoint
 485        || ctx->Polygon.OffsetLine
 486        || ctx->Polygon.OffsetFill)
 487       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 488 }
 489
 490
 491 /**
 492  * Update the ctx->_TriangleCaps bitfield.
 493  * XXX that bitfield should really go away someday!
 494  * This function must be called after other update_*() functions since
 495  * there are dependencies on some other derived values.
 496  */
 497 #if 0
 498 static void
 499 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 500 {
 501    ctx->_TriangleCaps = 0;
 502
 503    /*
 504     * Points
 505     */
 506    if (1/*new_state & _NEW_POINT*/) {
 507       if (ctx->Point.SmoothFlag)
 508          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 509       if (ctx->Point._Attenuated)
 510          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 511    }
 512
 513    /*
 514     * Lines
 515     */
 516    if (1/*new_state & _NEW_LINE*/) {
 517       if (ctx->Line.SmoothFlag)
 518          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 519       if (ctx->Line.StippleFlag)
 520          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 521    }
 522
 523    /*
 524     * Polygons
 525     */
 526    if (1/*new_state & _NEW_POLYGON*/) {
 527       if (ctx->Polygon.SmoothFlag)
 528          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 529       if (ctx->Polygon.StippleFlag)
 530          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 531       if (ctx->Polygon.FrontMode != GL_FILL
 532           || ctx->Polygon.BackMode != GL_FILL)
 533          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 534       if (ctx->Polygon.CullFlag
 535           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 536          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 537       if (ctx->Polygon.OffsetPoint ||
 538           ctx->Polygon.OffsetLine ||
 539           ctx->Polygon.OffsetFill)
 540          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 541    }
 542
 543    /*
 544     * Lighting and shading
 545     */
 546    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 547       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 548    if (ctx->Light.ShadeModel == GL_FLAT)
 549       ctx->_TriangleCaps |= DD_FLATSHADE;
 550    if (_mesa_need_secondary_color(ctx))
 551       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 552
 553    /*
 554     * Stencil
 555     */
 556    if (ctx->Stencil._TestTwoSide)
 557       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 558 }
 559 #endif
 560
 561
 562 /**
 563  * Compute derived GL state.
 564  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 565  * be called before rendering anything.
 566  *
 567  * Calls dd_function_table::UpdateState to perform any internal state
 568  * management necessary.
 569  *
 570  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 571  * _mesa_update_buffer_bounds(),
 572  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 573  */
 574 void
 575 _mesa_update_state_locked( struct gl_context *ctx )
 576 {
 577    GLbitfield new_state = ctx->NewState;
 578    GLbitfield prog_flags = _NEW_PROGRAM;
 579    GLbitfield new_prog_state = 0x0;
 580
 581    if (new_state == _NEW_CURRENT_ATTRIB)
 582       goto out;
 583
 584    if (MESA_VERBOSE & VERBOSE_STATE)
 585       _mesa_print_state("_mesa_update_state", new_state);
 586
 587    /* Determine which state flags effect vertex/fragment program state */
 588    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 589       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 590                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 591                      _NEW_PROGRAM | _NEW_FRAG_CLAMP);
 592    }
 593    if (ctx->VertexProgram._MaintainTnlProgram) {
 594       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 595                      _NEW_TRANSFORM | _NEW_POINT |
 596                      _NEW_FOG | _NEW_LIGHT |
 597                      _MESA_NEW_NEED_EYE_COORDS);
 598    }
 599
 600    /*
 601     * Now update derived state info
 602     */
 603
 604    if (new_state & prog_flags)
 605       update_program_enables( ctx );
 606
 607    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 608       _mesa_update_modelview_project( ctx, new_state );
 609
 610    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 611       _mesa_update_texture( ctx, new_state );
 612
 613    if (new_state & _NEW_BUFFERS)
 614       _mesa_update_framebuffer(ctx);
 615
 616    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 617       _mesa_update_draw_buffer_bounds( ctx );
 618
 619    if (new_state & _NEW_POLYGON)
 620       update_polygon( ctx );
 621
 622    if (new_state & _NEW_LIGHT)
 623       _mesa_update_lighting( ctx );
 624
 625    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 626       update_twoside( ctx );
 627
 628    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 629       update_clamp_vertex_color(ctx);
 630
 631    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 632       _mesa_update_stencil( ctx );
 633
 634    if (new_state & _NEW_PIXEL)
 635       _mesa_update_pixel( ctx, new_state );
 636
 637    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 638       update_separate_specular( ctx );
 639
 640    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 641       update_viewport_matrix(ctx);
 642
 643    if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))
 644       update_multisample( ctx );
 645
 646    if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
 647       update_clamp_read_color(ctx);
 648
 649    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 650       update_clamp_fragment_color(ctx);
 651
 652 #if 0
 653    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 654                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 655       update_tricaps( ctx, new_state );
 656 #endif
 657
 658    /* ctx->_NeedEyeCoords is now up to date.
 659     *
 660     * If the truth value of this variable has changed, update for the
 661     * new lighting space and recompute the positions of lights and the
 662     * normal transform.
 663     *
 664     * If the lighting space hasn't changed, may still need to recompute
 665     * light positions & normal transforms for other reasons.
 666     */
 667    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 668       _mesa_update_tnl_spaces( ctx, new_state );
 669
 670    if (new_state & prog_flags) {
 671       /* When we generate programs from fixed-function vertex/fragment state
 672        * this call may generate/bind a new program.  If so, we need to
 673        * propogate the _NEW_PROGRAM flag to the driver.
 674        */
 675       new_prog_state |= update_program( ctx );
 676    }
 677
 678    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 679       update_arrays( ctx );
 680
 681  out:
 682    new_prog_state |= update_program_constants(ctx);
 683
 684    /*
 685     * Give the driver a chance to act upon the new_state flags.
 686     * The driver might plug in different span functions, for example.
 687     * Also, this is where the driver can invalidate the state of any
 688     * active modules (such as swrast_setup, swrast, tnl, etc).
 689     *
 690     * Set ctx->NewState to zero to avoid recursion if
 691     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 692     */
 693    new_state = ctx->NewState | new_prog_state;
 694    ctx->NewState = 0;
 695    ctx->Driver.UpdateState(ctx, new_state);
 696    ctx->Array.NewState = 0;
 697    if (!ctx->Array.RebindArrays)
 698       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 699 }
 700
 701
 702 /* This is the usual entrypoint for state updates:
 703  */
 704 void
 705 _mesa_update_state( struct gl_context *ctx )
 706 {
 707    _mesa_lock_context_textures(ctx);
 708    _mesa_update_state_locked(ctx);
 709    _mesa_unlock_context_textures(ctx);
 710 }
 711
 712
 713
 714
 715 /**
 716  * Want to figure out which fragment program inputs are actually
 717  * constant/current values from ctx->Current.  These should be
 718  * referenced as a tracked state variable rather than a fragment
 719  * program input, to save the overhead of putting a constant value in
 720  * every submitted vertex, transferring it to hardware, interpolating
 721  * it across the triangle, etc...
 722  *
 723  * When there is a VP bound, just use vp->outputs.  But when we're
 724  * generating vp from fixed function state, basically want to
 725  * calculate:
 726  *
 727  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 728  *                 potential_vp_outputs )
 729  *
 730  * Where potential_vp_outputs is calculated by looking at enabled
 731  * texgen, etc.
 732  *
 733  * The generated fragment program should then only declare inputs that
 734  * may vary or otherwise differ from the ctx->Current values.
 735  * Otherwise, the fp should track them as state values instead.
 736  */
 737 void
 738 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 739                              GLbitfield varying_inputs )
 740 {
 741    if (ctx->varying_vp_inputs != varying_inputs) {
 742       ctx->varying_vp_inputs = varying_inputs;
 743       ctx->NewState |= _NEW_ARRAY;
 744       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 745    }
 746 }
 747
 748
 749 /**
 750  * Used by drivers to tell core Mesa that the driver is going to
 751  * install/ use its own vertex program.  In particular, this will
 752  * prevent generated fragment programs from using state vars instead
 753  * of ordinary varyings/inputs.
 754  */
 755 void
 756 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 757 {
 758    if (ctx->VertexProgram._Overriden != flag) {
 759       ctx->VertexProgram._Overriden = flag;
 760
 761       /* Set one of the bits which will trigger fragment program
 762        * regeneration:
 763        */
 764       ctx->NewState |= _NEW_PROGRAM;
 765    }
 766 }