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 vertex/fragment program state.  In particular, update these fields:
 207  *   ctx->VertexProgram._Current
 208  *   ctx->VertexProgram._TnlProgram,
 209  * These point to the highest priority enabled vertex/fragment program or are
 210  * NULL if fixed-function processing is to be done.
 211  *
 212  * This function needs to be called after texture state validation in case
 213  * we're generating a fragment program from fixed-function texture state.
 214  *
 215  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 216  * or fragment program is being used.
 217  */
 218 static GLbitfield
 219 update_program(struct gl_context *ctx)
 220 {
 221    const struct gl_shader_program *vsProg = ctx->Shader.CurrentVertexProgram;
 222    const struct gl_shader_program *gsProg = ctx->Shader.CurrentGeometryProgram;
 223    const struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;
 224    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 225    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 226    const struct gl_geometry_program *prevGP = ctx->GeometryProgram._Current;
 227    GLbitfield new_state = 0x0;
 228
 229    /*
 230     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 231     * pointers to the programs that should be used for rendering.  If either
 232     * is NULL, use fixed-function code paths.
 233     *
 234     * These programs may come from several sources.  The priority is as
 235     * follows:
 236     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 237     *   2. ARB/NV vertex/fragment programs
 238     *   3. Programs derived from fixed-function state.
 239     *
 240     * Note: it's possible for a vertex shader to get used with a fragment
 241     * program (and vice versa) here, but in practice that shouldn't ever
 242     * come up, or matter.
 243     */
 244
 245    if (fsProg && fsProg->LinkStatus && fsProg->FragmentProgram) {
 246       /* Use shader programs */
 247       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 248                                fsProg->FragmentProgram);
 249    }
 250    else if (ctx->FragmentProgram._Enabled) {
 251       /* use user-defined vertex program */
 252       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 253                                ctx->FragmentProgram.Current);
 254    }
 255    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 256       /* Use fragment program generated from fixed-function state.
 257        */
 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 shader programs */
 270       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 271                                gsProg->GeometryProgram);
 272    } else {
 273       /* no fragment 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 shader programs */
 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        */
 294       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 295                                _mesa_get_fixed_func_vertex_program(ctx));
 296       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 297                                ctx->VertexProgram._Current);
 298    }
 299    else {
 300       /* no vertex program */
 301       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 302    }
 303
 304    /* Let the driver know what's happening:
 305     */
 306    if (ctx->FragmentProgram._Current != prevFP) {
 307       new_state |= _NEW_PROGRAM;
 308       if (ctx->Driver.BindProgram) {
 309          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 310                           (struct gl_program *) ctx->FragmentProgram._Current);
 311       }
 312    }
 313
 314    if (ctx->GeometryProgram._Current != prevGP) {
 315       new_state |= _NEW_PROGRAM;
 316       if (ctx->Driver.BindProgram) {
 317          ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,
 318                             (struct gl_program *) ctx->GeometryProgram._Current);
 319       }
 320    }
 321
 322    if (ctx->VertexProgram._Current != prevVP) {
 323       new_state |= _NEW_PROGRAM;
 324       if (ctx->Driver.BindProgram) {
 325          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 326                             (struct gl_program *) ctx->VertexProgram._Current);
 327       }
 328    }
 329
 330    return new_state;
 331 }
 332
 333
 334 /**
 335  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 336  */
 337 static GLbitfield
 338 update_program_constants(struct gl_context *ctx)
 339 {
 340    GLbitfield new_state = 0x0;
 341
 342    if (ctx->FragmentProgram._Current) {
 343       const struct gl_program_parameter_list *params =
 344          ctx->FragmentProgram._Current->Base.Parameters;
 345       if (params && params->StateFlags & ctx->NewState) {
 346          new_state |= _NEW_PROGRAM_CONSTANTS;
 347       }
 348    }
 349
 350    if (ctx->GeometryProgram._Current) {
 351       const struct gl_program_parameter_list *params =
 352          ctx->GeometryProgram._Current->Base.Parameters;
 353       /*FIXME: StateFlags is always 0 because we have unnamed constant
 354        *       not state changes */
 355       if (params /*&& params->StateFlags & ctx->NewState*/) {
 356          new_state |= _NEW_PROGRAM_CONSTANTS;
 357       }
 358    }
 359
 360    if (ctx->VertexProgram._Current) {
 361       const struct gl_program_parameter_list *params =
 362          ctx->VertexProgram._Current->Base.Parameters;
 363       if (params && params->StateFlags & ctx->NewState) {
 364          new_state |= _NEW_PROGRAM_CONSTANTS;
 365       }
 366    }
 367
 368    return new_state;
 369 }
 370
 371
 372
 373
 374 static void
 375 update_viewport_matrix(struct gl_context *ctx)
 376 {
 377    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 378
 379    ASSERT(depthMax > 0);
 380
 381    /* Compute scale and bias values. This is really driver-specific
 382     * and should be maintained elsewhere if at all.
 383     * NOTE: RasterPos uses this.
 384     */
 385    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 386                          ctx->Viewport.X, ctx->Viewport.Y,
 387                          ctx->Viewport.Width, ctx->Viewport.Height,
 388                          ctx->Viewport.Near, ctx->Viewport.Far,
 389                          depthMax);
 390 }
 391
 392
 393 /**
 394  * Update derived multisample state.
 395  */
 396 static void
 397 update_multisample(struct gl_context *ctx)
 398 {
 399    ctx->Multisample._Enabled = GL_FALSE;
 400    if (ctx->Multisample.Enabled &&
 401        ctx->DrawBuffer &&
 402        ctx->DrawBuffer->Visual.sampleBuffers)
 403       ctx->Multisample._Enabled = GL_TRUE;
 404 }
 405
 406
 407 /**
 408  * Update derived color/blend/logicop state.
 409  */
 410 static void
 411 update_color(struct gl_context *ctx)
 412 {
 413    /* This is needed to support 1.1's RGB logic ops AND
 414     * 1.0's blending logicops.
 415     */
 416    ctx->Color._LogicOpEnabled = _mesa_rgba_logicop_enabled(ctx);
 417 }
 418
 419 static void
 420 update_clamp_fragment_color(struct gl_context *ctx)
 421 {
 422    if(ctx->Color.ClampFragmentColor == GL_FIXED_ONLY_ARB)
 423       ctx->Color._ClampFragmentColor = !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 424    else
 425       ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
 426 }
 427
 428 static void
 429 update_clamp_vertex_color(struct gl_context *ctx)
 430 {
 431    if(ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
 432       ctx->Light._ClampVertexColor = !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 433    else
 434       ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
 435 }
 436
 437 static void
 438 update_clamp_read_color(struct gl_context *ctx)
 439 {
 440    if(ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
 441       ctx->Color._ClampReadColor = !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
 442    else
 443       ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
 444 }
 445
 446
 447
 448
 449 /*
 450  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 451  * in ctx->_TriangleCaps if needed.
 452  */
 453 static void
 454 update_polygon(struct gl_context *ctx)
 455 {
 456    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 457
 458    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 459       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 460
 461    if (   ctx->Polygon.OffsetPoint
 462        || ctx->Polygon.OffsetLine
 463        || ctx->Polygon.OffsetFill)
 464       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 465 }
 466
 467
 468 /**
 469  * Update the ctx->_TriangleCaps bitfield.
 470  * XXX that bitfield should really go away someday!
 471  * This function must be called after other update_*() functions since
 472  * there are dependencies on some other derived values.
 473  */
 474 #if 0
 475 static void
 476 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 477 {
 478    ctx->_TriangleCaps = 0;
 479
 480    /*
 481     * Points
 482     */
 483    if (1/*new_state & _NEW_POINT*/) {
 484       if (ctx->Point.SmoothFlag)
 485          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 486       if (ctx->Point._Attenuated)
 487          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 488    }
 489
 490    /*
 491     * Lines
 492     */
 493    if (1/*new_state & _NEW_LINE*/) {
 494       if (ctx->Line.SmoothFlag)
 495          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 496       if (ctx->Line.StippleFlag)
 497          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 498    }
 499
 500    /*
 501     * Polygons
 502     */
 503    if (1/*new_state & _NEW_POLYGON*/) {
 504       if (ctx->Polygon.SmoothFlag)
 505          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 506       if (ctx->Polygon.StippleFlag)
 507          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 508       if (ctx->Polygon.FrontMode != GL_FILL
 509           || ctx->Polygon.BackMode != GL_FILL)
 510          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 511       if (ctx->Polygon.CullFlag
 512           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 513          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 514       if (ctx->Polygon.OffsetPoint ||
 515           ctx->Polygon.OffsetLine ||
 516           ctx->Polygon.OffsetFill)
 517          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 518    }
 519
 520    /*
 521     * Lighting and shading
 522     */
 523    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 524       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 525    if (ctx->Light.ShadeModel == GL_FLAT)
 526       ctx->_TriangleCaps |= DD_FLATSHADE;
 527    if (_mesa_need_secondary_color(ctx))
 528       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 529
 530    /*
 531     * Stencil
 532     */
 533    if (ctx->Stencil._TestTwoSide)
 534       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 535 }
 536 #endif
 537
 538
 539 /**
 540  * Compute derived GL state.
 541  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 542  * be called before rendering anything.
 543  *
 544  * Calls dd_function_table::UpdateState to perform any internal state
 545  * management necessary.
 546  *
 547  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 548  * _mesa_update_buffer_bounds(),
 549  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 550  */
 551 void
 552 _mesa_update_state_locked( struct gl_context *ctx )
 553 {
 554    GLbitfield new_state = ctx->NewState;
 555    GLbitfield prog_flags = _NEW_PROGRAM;
 556    GLbitfield new_prog_state = 0x0;
 557
 558    if (new_state == _NEW_CURRENT_ATTRIB)
 559       goto out;
 560
 561    if (MESA_VERBOSE & VERBOSE_STATE)
 562       _mesa_print_state("_mesa_update_state", new_state);
 563
 564    /* Determine which state flags effect vertex/fragment program state */
 565    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 566       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 567                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 568                      _NEW_PROGRAM | _NEW_FRAG_CLAMP);
 569    }
 570    if (ctx->VertexProgram._MaintainTnlProgram) {
 571       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 572                      _NEW_TRANSFORM | _NEW_POINT |
 573                      _NEW_FOG | _NEW_LIGHT |
 574                      _MESA_NEW_NEED_EYE_COORDS);
 575    }
 576
 577    /*
 578     * Now update derived state info
 579     */
 580
 581    if (new_state & prog_flags)
 582       update_program_enables( ctx );
 583
 584    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 585       _mesa_update_modelview_project( ctx, new_state );
 586
 587    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 588       _mesa_update_texture( ctx, new_state );
 589
 590    if (new_state & _NEW_BUFFERS)
 591       _mesa_update_framebuffer(ctx);
 592
 593    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 594       _mesa_update_draw_buffer_bounds( ctx );
 595
 596    if (new_state & _NEW_POLYGON)
 597       update_polygon( ctx );
 598
 599    if (new_state & _NEW_LIGHT)
 600       _mesa_update_lighting( ctx );
 601
 602    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 603       update_clamp_vertex_color(ctx);
 604
 605    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 606       _mesa_update_stencil( ctx );
 607
 608    if (new_state & _NEW_PIXEL)
 609       _mesa_update_pixel( ctx, new_state );
 610
 611    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 612       update_separate_specular( ctx );
 613
 614    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 615       update_viewport_matrix(ctx);
 616
 617    if (new_state & _NEW_MULTISAMPLE)
 618       update_multisample( ctx );
 619
 620    if (new_state & _NEW_COLOR)
 621       update_color( ctx );
 622
 623    if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
 624       update_clamp_read_color(ctx);
 625
 626    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 627       update_clamp_fragment_color(ctx);
 628
 629 #if 0
 630    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 631                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 632       update_tricaps( ctx, new_state );
 633 #endif
 634
 635    /* ctx->_NeedEyeCoords is now up to date.
 636     *
 637     * If the truth value of this variable has changed, update for the
 638     * new lighting space and recompute the positions of lights and the
 639     * normal transform.
 640     *
 641     * If the lighting space hasn't changed, may still need to recompute
 642     * light positions & normal transforms for other reasons.
 643     */
 644    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 645       _mesa_update_tnl_spaces( ctx, new_state );
 646
 647    if (new_state & prog_flags) {
 648       /* When we generate programs from fixed-function vertex/fragment state
 649        * this call may generate/bind a new program.  If so, we need to
 650        * propogate the _NEW_PROGRAM flag to the driver.
 651        */
 652       new_prog_state |= update_program( ctx );
 653    }
 654
 655    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 656       update_arrays( ctx );
 657
 658  out:
 659    new_prog_state |= update_program_constants(ctx);
 660
 661    /*
 662     * Give the driver a chance to act upon the new_state flags.
 663     * The driver might plug in different span functions, for example.
 664     * Also, this is where the driver can invalidate the state of any
 665     * active modules (such as swrast_setup, swrast, tnl, etc).
 666     *
 667     * Set ctx->NewState to zero to avoid recursion if
 668     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 669     */
 670    new_state = ctx->NewState | new_prog_state;
 671    ctx->NewState = 0;
 672    ctx->Driver.UpdateState(ctx, new_state);
 673    ctx->Array.NewState = 0;
 674    if (!ctx->Array.RebindArrays)
 675       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 676 }
 677
 678
 679 /* This is the usual entrypoint for state updates:
 680  */
 681 void
 682 _mesa_update_state( struct gl_context *ctx )
 683 {
 684    _mesa_lock_context_textures(ctx);
 685    _mesa_update_state_locked(ctx);
 686    _mesa_unlock_context_textures(ctx);
 687 }
 688
 689
 690
 691
 692 /**
 693  * Want to figure out which fragment program inputs are actually
 694  * constant/current values from ctx->Current.  These should be
 695  * referenced as a tracked state variable rather than a fragment
 696  * program input, to save the overhead of putting a constant value in
 697  * every submitted vertex, transferring it to hardware, interpolating
 698  * it across the triangle, etc...
 699  *
 700  * When there is a VP bound, just use vp->outputs.  But when we're
 701  * generating vp from fixed function state, basically want to
 702  * calculate:
 703  *
 704  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 705  *                 potential_vp_outputs )
 706  *
 707  * Where potential_vp_outputs is calculated by looking at enabled
 708  * texgen, etc.
 709  *
 710  * The generated fragment program should then only declare inputs that
 711  * may vary or otherwise differ from the ctx->Current values.
 712  * Otherwise, the fp should track them as state values instead.
 713  */
 714 void
 715 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 716                              GLbitfield varying_inputs )
 717 {
 718    if (ctx->varying_vp_inputs != varying_inputs) {
 719       ctx->varying_vp_inputs = varying_inputs;
 720       ctx->NewState |= _NEW_ARRAY;
 721       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 722    }
 723 }
 724
 725
 726 /**
 727  * Used by drivers to tell core Mesa that the driver is going to
 728  * install/ use its own vertex program.  In particular, this will
 729  * prevent generated fragment programs from using state vars instead
 730  * of ordinary varyings/inputs.
 731  */
 732 void
 733 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 734 {
 735    if (ctx->VertexProgram._Overriden != flag) {
 736       ctx->VertexProgram._Overriden = flag;
 737
 738       /* Set one of the bits which will trigger fragment program
 739        * regeneration:
 740        */
 741       ctx->NewState |= _NEW_PROGRAM;
 742    }
 743 }