reactos/dll/opengl/mesa/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 "shaderobj.h"
  47 #include "state.h"
  48 #include "stencil.h"
  49 #include "texenvprogram.h"
  50 #include "texobj.h"
  51 #include "texstate.h"
  52 #include "varray.h"
  53
  54
  55 static void
  56 update_separate_specular(struct gl_context *ctx)
  57 {
  58    if (_mesa_need_secondary_color(ctx))
  59       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  60    else
  61       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  62 }
  63
  64
  65 /**
  66  * Helper for update_arrays().
  67  * \return  min(current min, array->_MaxElement).
  68  */
  69 static GLuint
  70 update_min(GLuint min, struct gl_client_array *array)
  71 {
  72    _mesa_update_array_max_element(array);
  73    return MIN2(min, array->_MaxElement);
  74 }
  75
  76
  77 /**
  78  * Update ctx->Array._MaxElement (the max legal index into all enabled arrays).
  79  * Need to do this upon new array state or new buffer object state.
  80  */
  81 static void
  82 update_arrays( struct gl_context *ctx )
  83 {
  84    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
  85    GLuint i, min = ~0;
  86
  87    /* find min of _MaxElement values for all enabled arrays.
  88     * Note that the generic arrays always take precedence over
  89     * the legacy arrays.
  90     */
  91
  92    /* 0 */
  93    if (ctx->VertexProgram._Current
  94        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC0].Enabled) {
  95       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC0]);
  96    }
  97    else if (arrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
  98       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_POS]);
  99    }
 100
 101    /* 1 */
 102    if (ctx->VertexProgram._Enabled
 103        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC1].Enabled) {
 104       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC1]);
 105    }
 106    /* no conventional vertex weight array */
 107
 108    /* 2 */
 109    if (ctx->VertexProgram._Enabled
 110        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC2].Enabled) {
 111       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC2]);
 112    }
 113    else if (arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
 114       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]);
 115    }
 116
 117    /* 3 */
 118    if (ctx->VertexProgram._Enabled
 119        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC3].Enabled) {
 120       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC3]);
 121    }
 122    else if (arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 123       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]);
 124    }
 125
 126    /* 4 */
 127    if (ctx->VertexProgram._Enabled
 128        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC4].Enabled) {
 129       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC4]);
 130    }
 131    else if (arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 132       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]);
 133    }
 134
 135    /* 5 */
 136    if (ctx->VertexProgram._Enabled
 137        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC5].Enabled) {
 138       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC5]);
 139    }
 140    else if (arrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 141       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_FOG]);
 142    }
 143
 144    /* 6 */
 145    if (ctx->VertexProgram._Enabled
 146        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC6].Enabled) {
 147       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC6]);
 148    }
 149    else if (arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 150       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]);
 151    }
 152
 153    /* 7 */
 154    if (ctx->VertexProgram._Enabled
 155        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC7].Enabled) {
 156       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC7]);
 157    }
 158
 159    /* 8..15 */
 160    for (i = 0; i < VERT_ATTRIB_TEX_MAX; i++) {
 161       if (ctx->VertexProgram._Enabled
 162           && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC8 + i].Enabled) {
 163          min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC8 + i]);
 164       }
 165       else if (i < ctx->Const.MaxTextureCoordUnits
 166                && arrayObj->VertexAttrib[VERT_ATTRIB_TEX(i)].Enabled) {
 167          min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_TEX(i)]);
 168       }
 169    }
 170
 171    /* 16..31 */
 172    if (ctx->VertexProgram._Current) {
 173       for (i = 0; i < VERT_ATTRIB_GENERIC_MAX; i++) {
 174          if (arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC(i)].Enabled) {
 175             min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC(i)]);
 176          }
 177       }
 178    }
 179
 180    if (arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 181       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]);
 182    }
 183
 184    /* _MaxElement is one past the last legal array element */
 185    arrayObj->_MaxElement = min;
 186 }
 187
 188
 189 /**
 190  * Update the following fields:
 191  *   ctx->VertexProgram._Enabled
 192  *   ctx->FragmentProgram._Enabled
 193  *   ctx->ATIFragmentShader._Enabled
 194  * This needs to be done before texture state validation.
 195  */
 196 static void
 197 update_program_enables(struct gl_context *ctx)
 198 {
 199    /* These _Enabled flags indicate if the user-defined ARB/NV vertex/fragment
 200     * program is enabled AND valid.  Similarly for ATI fragment shaders.
 201     * GLSL shaders not relevant here.
 202     */
 203    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 204       && ctx->VertexProgram.Current->Base.Instructions;
 205    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 206       && ctx->FragmentProgram.Current->Base.Instructions;
 207 }
 208
 209
 210 /**
 211  * Update the ctx->Vertex/Geometry/FragmentProgram._Current pointers to point
 212  * to the current/active programs.  Then call ctx->Driver.BindProgram() to
 213  * tell the driver which programs to use.
 214  *
 215  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
 216  * programs or programs derived from fixed-function state.
 217  *
 218  * This function needs to be called after texture state validation in case
 219  * we're generating a fragment program from fixed-function texture state.
 220  *
 221  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 222  * or fragment program is being used.
 223  */
 224 static GLbitfield
 225 update_program(struct gl_context *ctx)
 226 {
 227    const struct gl_shader_program *vsProg = ctx->Shader.CurrentVertexProgram;
 228    struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;
 229    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 230    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._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_shader_program(ctx,
 253                                      &ctx->Shader._CurrentFragmentProgram,
 254                                      fsProg);
 255       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 256                                (struct gl_fragment_program *)
 257                                fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 258       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 259                                NULL);
 260    }
 261    else if (ctx->FragmentProgram._Enabled) {
 262       /* Use user-defined fragment program */
 263       _mesa_reference_shader_program(ctx,
 264                                      &ctx->Shader._CurrentFragmentProgram,
 265                                      NULL);
 266       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 267                                ctx->FragmentProgram.Current);
 268       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 269                                NULL);
 270    }
 271    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 272       /* Use fragment program generated from fixed-function state */
 273       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 274
 275       _mesa_reference_shader_program(ctx,
 276                                      &ctx->Shader._CurrentFragmentProgram,
 277                                      f);
 278       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 279                                (struct gl_fragment_program *)
 280                                f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 281       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 282                                (struct gl_fragment_program *)
 283                                f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 284    }
 285    else {
 286       /* No fragment program */
 287       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 288       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 289                                NULL);
 290    }
 291
 292    /* Examine vertex program after fragment program as
 293     * _mesa_get_fixed_func_vertex_program() needs to know active
 294     * fragprog inputs.
 295     */
 296    if (vsProg && vsProg->LinkStatus
 297        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 298       /* Use GLSL vertex shader */
 299       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 300                                (struct gl_vertex_program *)
 301                                vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program);
 302    }
 303    else if (ctx->VertexProgram._Enabled) {
 304       /* Use user-defined vertex program */
 305       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 306                                ctx->VertexProgram.Current);
 307    }
 308    else if (ctx->VertexProgram._MaintainTnlProgram) {
 309       /* Use vertex program generated from fixed-function state */
 310       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 311                                _mesa_get_fixed_func_vertex_program(ctx));
 312       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 313                                ctx->VertexProgram._Current);
 314    }
 315    else {
 316       /* no vertex program */
 317       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 318    }
 319
 320    /* Let the driver know what's happening:
 321     */
 322    if (ctx->FragmentProgram._Current != prevFP) {
 323       new_state |= _NEW_PROGRAM;
 324       if (ctx->Driver.BindProgram) {
 325          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 326                           (struct gl_program *) ctx->FragmentProgram._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->VertexProgram._Current) {
 359       const struct gl_program_parameter_list *params =
 360          ctx->VertexProgram._Current->Base.Parameters;
 361       if (params && params->StateFlags & ctx->NewState) {
 362          new_state |= _NEW_PROGRAM_CONSTANTS;
 363       }
 364    }
 365
 366    return new_state;
 367 }
 368
 369
 370
 371
 372 static void
 373 update_viewport_matrix(struct gl_context *ctx)
 374 {
 375    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 376
 377    ASSERT(depthMax > 0);
 378
 379    /* Compute scale and bias values. This is really driver-specific
 380     * and should be maintained elsewhere if at all.
 381     * NOTE: RasterPos uses this.
 382     */
 383    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 384                          ctx->Viewport.X, ctx->Viewport.Y,
 385                          ctx->Viewport.Width, ctx->Viewport.Height,
 386                          ctx->Viewport.Near, ctx->Viewport.Far,
 387                          depthMax);
 388 }
 389
 390
 391 /**
 392  * Update derived multisample state.
 393  */
 394 static void
 395 update_multisample(struct gl_context *ctx)
 396 {
 397    ctx->Multisample._Enabled = GL_FALSE;
 398    if (ctx->Multisample.Enabled &&
 399        ctx->DrawBuffer &&
 400        ctx->DrawBuffer->Visual.sampleBuffers)
 401       ctx->Multisample._Enabled = GL_TRUE;
 402 }
 403
 404
 405 /**
 406  * Update the ctx->Color._ClampFragmentColor field
 407  */
 408 static void
 409 update_clamp_fragment_color(struct gl_context *ctx)
 410 {
 411    if (ctx->Color.ClampFragmentColor == GL_FIXED_ONLY_ARB)
 412       ctx->Color._ClampFragmentColor =
 413          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 414    else
 415       ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
 416 }
 417
 418
 419 /**
 420  * Update the ctx->Color._ClampVertexColor field
 421  */
 422 static void
 423 update_clamp_vertex_color(struct gl_context *ctx)
 424 {
 425    if (ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
 426       ctx->Light._ClampVertexColor =
 427          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 428    else
 429       ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
 430 }
 431
 432
 433 /**
 434  * Update the ctx->Color._ClampReadColor field
 435  */
 436 static void
 437 update_clamp_read_color(struct gl_context *ctx)
 438 {
 439    if (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
 440       ctx->Color._ClampReadColor =
 441          !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
 442    else
 443       ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
 444 }
 445
 446 /**
 447  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 448  */
 449 static void
 450 update_twoside(struct gl_context *ctx)
 451 {
 452    if (ctx->Shader.CurrentVertexProgram ||
 453        ctx->VertexProgram._Enabled) {
 454       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 455    } else {
 456       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 457                                             ctx->Light.Model.TwoSide);
 458    }
 459 }
 460
 461
 462 /*
 463  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 464  * in ctx->_TriangleCaps if needed.
 465  */
 466 static void
 467 update_polygon(struct gl_context *ctx)
 468 {
 469    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 470
 471    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 472       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 473
 474    if (   ctx->Polygon.OffsetPoint
 475        || ctx->Polygon.OffsetLine
 476        || ctx->Polygon.OffsetFill)
 477       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 478 }
 479
 480
 481 /**
 482  * Update the ctx->_TriangleCaps bitfield.
 483  * XXX that bitfield should really go away someday!
 484  * This function must be called after other update_*() functions since
 485  * there are dependencies on some other derived values.
 486  */
 487 #if 0
 488 static void
 489 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 490 {
 491    ctx->_TriangleCaps = 0;
 492
 493    /*
 494     * Points
 495     */
 496    if (1/*new_state & _NEW_POINT*/) {
 497       if (ctx->Point.SmoothFlag)
 498          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 499       if (ctx->Point._Attenuated)
 500          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 501    }
 502
 503    /*
 504     * Lines
 505     */
 506    if (1/*new_state & _NEW_LINE*/) {
 507       if (ctx->Line.SmoothFlag)
 508          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 509       if (ctx->Line.StippleFlag)
 510          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 511    }
 512
 513    /*
 514     * Polygons
 515     */
 516    if (1/*new_state & _NEW_POLYGON*/) {
 517       if (ctx->Polygon.SmoothFlag)
 518          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 519       if (ctx->Polygon.StippleFlag)
 520          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 521       if (ctx->Polygon.FrontMode != GL_FILL
 522           || ctx->Polygon.BackMode != GL_FILL)
 523          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 524       if (ctx->Polygon.CullFlag
 525           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 526          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 527       if (ctx->Polygon.OffsetPoint ||
 528           ctx->Polygon.OffsetLine ||
 529           ctx->Polygon.OffsetFill)
 530          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 531    }
 532
 533    /*
 534     * Lighting and shading
 535     */
 536    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 537       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 538    if (ctx->Light.ShadeModel == GL_FLAT)
 539       ctx->_TriangleCaps |= DD_FLATSHADE;
 540    if (_mesa_need_secondary_color(ctx))
 541       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 542
 543    /*
 544     * Stencil
 545     */
 546    if (ctx->Stencil._TestTwoSide)
 547       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 548 }
 549 #endif
 550
 551
 552 /**
 553  * Compute derived GL state.
 554  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 555  * be called before rendering anything.
 556  *
 557  * Calls dd_function_table::UpdateState to perform any internal state
 558  * management necessary.
 559  *
 560  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 561  * _mesa_update_buffer_bounds(),
 562  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 563  */
 564 void
 565 _mesa_update_state_locked( struct gl_context *ctx )
 566 {
 567    GLbitfield new_state = ctx->NewState;
 568    GLbitfield prog_flags = _NEW_PROGRAM;
 569    GLbitfield new_prog_state = 0x0;
 570
 571    if (new_state == _NEW_CURRENT_ATTRIB)
 572       goto out;
 573
 574    if (MESA_VERBOSE & VERBOSE_STATE)
 575       _mesa_print_state("_mesa_update_state", new_state);
 576
 577    /* Determine which state flags effect vertex/fragment program state */
 578    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 579       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 580                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 581                      _NEW_PROGRAM | _NEW_FRAG_CLAMP | _NEW_COLOR);
 582    }
 583    if (ctx->VertexProgram._MaintainTnlProgram) {
 584       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 585                      _NEW_TRANSFORM | _NEW_POINT |
 586                      _NEW_FOG | _NEW_LIGHT |
 587                      _MESA_NEW_NEED_EYE_COORDS);
 588    }
 589
 590    /*
 591     * Now update derived state info
 592     */
 593
 594    if (new_state & prog_flags)
 595       update_program_enables( ctx );
 596
 597    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 598       _mesa_update_modelview_project( ctx, new_state );
 599
 600    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 601       _mesa_update_texture( ctx, new_state );
 602
 603    if (new_state & _NEW_BUFFERS)
 604       _mesa_update_framebuffer(ctx);
 605
 606    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 607       _mesa_update_draw_buffer_bounds( ctx );
 608
 609    if (new_state & _NEW_POLYGON)
 610       update_polygon( ctx );
 611
 612    if (new_state & _NEW_LIGHT)
 613       _mesa_update_lighting( ctx );
 614
 615    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 616       update_twoside( ctx );
 617
 618    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 619       update_clamp_vertex_color(ctx);
 620
 621    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 622       _mesa_update_stencil( ctx );
 623
 624    if (new_state & _NEW_PIXEL)
 625       _mesa_update_pixel( ctx, new_state );
 626
 627    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 628       update_separate_specular( ctx );
 629
 630    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 631       update_viewport_matrix(ctx);
 632
 633    if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))
 634       update_multisample( ctx );
 635
 636    if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
 637       update_clamp_read_color(ctx);
 638
 639    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 640       update_clamp_fragment_color(ctx);
 641
 642 #if 0
 643    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 644                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 645       update_tricaps( ctx, new_state );
 646 #endif
 647
 648    /* ctx->_NeedEyeCoords is now up to date.
 649     *
 650     * If the truth value of this variable has changed, update for the
 651     * new lighting space and recompute the positions of lights and the
 652     * normal transform.
 653     *
 654     * If the lighting space hasn't changed, may still need to recompute
 655     * light positions & normal transforms for other reasons.
 656     */
 657    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 658       _mesa_update_tnl_spaces( ctx, new_state );
 659
 660    if (new_state & prog_flags) {
 661       /* When we generate programs from fixed-function vertex/fragment state
 662        * this call may generate/bind a new program.  If so, we need to
 663        * propogate the _NEW_PROGRAM flag to the driver.
 664        */
 665       new_prog_state |= update_program( ctx );
 666    }
 667
 668    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 669       update_arrays( ctx );
 670
 671  out:
 672    new_prog_state |= update_program_constants(ctx);
 673
 674    /*
 675     * Give the driver a chance to act upon the new_state flags.
 676     * The driver might plug in different span functions, for example.
 677     * Also, this is where the driver can invalidate the state of any
 678     * active modules (such as swrast_setup, swrast, tnl, etc).
 679     *
 680     * Set ctx->NewState to zero to avoid recursion if
 681     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 682     */
 683    new_state = ctx->NewState | new_prog_state;
 684    ctx->NewState = 0;
 685    ctx->Driver.UpdateState(ctx, new_state);
 686    ctx->Array.NewState = 0;
 687    if (!ctx->Array.RebindArrays)
 688       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 689 }
 690
 691
 692 /* This is the usual entrypoint for state updates:
 693  */
 694 void
 695 _mesa_update_state( struct gl_context *ctx )
 696 {
 697    _mesa_lock_context_textures(ctx);
 698    _mesa_update_state_locked(ctx);
 699    _mesa_unlock_context_textures(ctx);
 700 }
 701
 702
 703
 704
 705 /**
 706  * Want to figure out which fragment program inputs are actually
 707  * constant/current values from ctx->Current.  These should be
 708  * referenced as a tracked state variable rather than a fragment
 709  * program input, to save the overhead of putting a constant value in
 710  * every submitted vertex, transferring it to hardware, interpolating
 711  * it across the triangle, etc...
 712  *
 713  * When there is a VP bound, just use vp->outputs.  But when we're
 714  * generating vp from fixed function state, basically want to
 715  * calculate:
 716  *
 717  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 718  *                 potential_vp_outputs )
 719  *
 720  * Where potential_vp_outputs is calculated by looking at enabled
 721  * texgen, etc.
 722  *
 723  * The generated fragment program should then only declare inputs that
 724  * may vary or otherwise differ from the ctx->Current values.
 725  * Otherwise, the fp should track them as state values instead.
 726  */
 727 void
 728 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 729                              GLbitfield64 varying_inputs )
 730 {
 731    if (ctx->varying_vp_inputs != varying_inputs) {
 732       ctx->varying_vp_inputs = varying_inputs;
 733       ctx->NewState |= _NEW_ARRAY;
 734       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 735    }
 736 }
 737
 738
 739 /**
 740  * Used by drivers to tell core Mesa that the driver is going to
 741  * install/ use its own vertex program.  In particular, this will
 742  * prevent generated fragment programs from using state vars instead
 743  * of ordinary varyings/inputs.
 744  */
 745 void
 746 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 747 {
 748    if (ctx->VertexProgram._Overriden != flag) {
 749       ctx->VertexProgram._Overriden = flag;
 750
 751       /* Set one of the bits which will trigger fragment program
 752        * regeneration:
 753        */
 754       ctx->NewState |= _NEW_PROGRAM;
 755    }
 756 }