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