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       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 264
 265       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 266                                (struct gl_fragment_program *)
 267                                f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 268    }
 269    else {
 270       /* No fragment program */
 271       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 272    }
 273
 274    if (gsProg && gsProg->LinkStatus
 275        && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {
 276       /* Use GLSL geometry shader */
 277       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 278                                (struct gl_geometry_program *)
 279                                gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program);
 280    } else {
 281       /* No geometry program */
 282       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 283    }
 284
 285    /* Examine vertex program after fragment program as
 286     * _mesa_get_fixed_func_vertex_program() needs to know active
 287     * fragprog inputs.
 288     */
 289    if (vsProg && vsProg->LinkStatus
 290        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 291       /* Use GLSL vertex shader */
 292       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 293                                (struct gl_vertex_program *)
 294                                vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program);
 295    }
 296    else if (ctx->VertexProgram._Enabled) {
 297       /* Use user-defined vertex program */
 298       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 299                                ctx->VertexProgram.Current);
 300    }
 301    else if (ctx->VertexProgram._MaintainTnlProgram) {
 302       /* Use vertex program generated from fixed-function state */
 303       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 304                                _mesa_get_fixed_func_vertex_program(ctx));
 305       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 306                                ctx->VertexProgram._Current);
 307    }
 308    else {
 309       /* no vertex program */
 310       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 311    }
 312
 313    /* Let the driver know what's happening:
 314     */
 315    if (ctx->FragmentProgram._Current != prevFP) {
 316       new_state |= _NEW_PROGRAM;
 317       if (ctx->Driver.BindProgram) {
 318          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 319                           (struct gl_program *) ctx->FragmentProgram._Current);
 320       }
 321    }
 322
 323    if (ctx->GeometryProgram._Current != prevGP) {
 324       new_state |= _NEW_PROGRAM;
 325       if (ctx->Driver.BindProgram) {
 326          ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,
 327                             (struct gl_program *) ctx->GeometryProgram._Current);
 328       }
 329    }
 330
 331    if (ctx->VertexProgram._Current != prevVP) {
 332       new_state |= _NEW_PROGRAM;
 333       if (ctx->Driver.BindProgram) {
 334          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 335                             (struct gl_program *) ctx->VertexProgram._Current);
 336       }
 337    }
 338
 339    return new_state;
 340 }
 341
 342
 343 /**
 344  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 345  */
 346 static GLbitfield
 347 update_program_constants(struct gl_context *ctx)
 348 {
 349    GLbitfield new_state = 0x0;
 350
 351    if (ctx->FragmentProgram._Current) {
 352       const struct gl_program_parameter_list *params =
 353          ctx->FragmentProgram._Current->Base.Parameters;
 354       if (params && params->StateFlags & ctx->NewState) {
 355          new_state |= _NEW_PROGRAM_CONSTANTS;
 356       }
 357    }
 358
 359    if (ctx->GeometryProgram._Current) {
 360       const struct gl_program_parameter_list *params =
 361          ctx->GeometryProgram._Current->Base.Parameters;
 362       /*FIXME: StateFlags is always 0 because we have unnamed constant
 363        *       not state changes */
 364       if (params /*&& params->StateFlags & ctx->NewState*/) {
 365          new_state |= _NEW_PROGRAM_CONSTANTS;
 366       }
 367    }
 368
 369    if (ctx->VertexProgram._Current) {
 370       const struct gl_program_parameter_list *params =
 371          ctx->VertexProgram._Current->Base.Parameters;
 372       if (params && params->StateFlags & ctx->NewState) {
 373          new_state |= _NEW_PROGRAM_CONSTANTS;
 374       }
 375    }
 376
 377    return new_state;
 378 }
 379
 380
 381
 382
 383 static void
 384 update_viewport_matrix(struct gl_context *ctx)
 385 {
 386    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 387
 388    ASSERT(depthMax > 0);
 389
 390    /* Compute scale and bias values. This is really driver-specific
 391     * and should be maintained elsewhere if at all.
 392     * NOTE: RasterPos uses this.
 393     */
 394    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 395                          ctx->Viewport.X, ctx->Viewport.Y,
 396                          ctx->Viewport.Width, ctx->Viewport.Height,
 397                          ctx->Viewport.Near, ctx->Viewport.Far,
 398                          depthMax);
 399 }
 400
 401
 402 /**
 403  * Update derived multisample state.
 404  */
 405 static void
 406 update_multisample(struct gl_context *ctx)
 407 {
 408    ctx->Multisample._Enabled = GL_FALSE;
 409    if (ctx->Multisample.Enabled &&
 410        ctx->DrawBuffer &&
 411        ctx->DrawBuffer->Visual.sampleBuffers)
 412       ctx->Multisample._Enabled = GL_TRUE;
 413 }
 414
 415
 416 /**
 417  * Update the ctx->Color._ClampFragmentColor field
 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 =
 424          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 425    else
 426       ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
 427 }
 428
 429
 430 /**
 431  * Update the ctx->Color._ClampVertexColor field
 432  */
 433 static void
 434 update_clamp_vertex_color(struct gl_context *ctx)
 435 {
 436    if (ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
 437       ctx->Light._ClampVertexColor =
 438          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 439    else
 440       ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
 441 }
 442
 443
 444 /**
 445  * Update the ctx->Color._ClampReadColor field
 446  */
 447 static void
 448 update_clamp_read_color(struct gl_context *ctx)
 449 {
 450    if (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
 451       ctx->Color._ClampReadColor =
 452          !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
 453    else
 454       ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
 455 }
 456
 457 /**
 458  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 459  */
 460 static void
 461 update_twoside(struct gl_context *ctx)
 462 {
 463    if (ctx->Shader.CurrentVertexProgram ||
 464        ctx->VertexProgram._Enabled) {
 465       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 466    } else {
 467       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 468                                             ctx->Light.Model.TwoSide);
 469    }
 470 }
 471
 472
 473 /*
 474  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 475  * in ctx->_TriangleCaps if needed.
 476  */
 477 static void
 478 update_polygon(struct gl_context *ctx)
 479 {
 480    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 481
 482    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 483       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 484
 485    if (   ctx->Polygon.OffsetPoint
 486        || ctx->Polygon.OffsetLine
 487        || ctx->Polygon.OffsetFill)
 488       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 489 }
 490
 491
 492 /**
 493  * Update the ctx->_TriangleCaps bitfield.
 494  * XXX that bitfield should really go away someday!
 495  * This function must be called after other update_*() functions since
 496  * there are dependencies on some other derived values.
 497  */
 498 #if 0
 499 static void
 500 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 501 {
 502    ctx->_TriangleCaps = 0;
 503
 504    /*
 505     * Points
 506     */
 507    if (1/*new_state & _NEW_POINT*/) {
 508       if (ctx->Point.SmoothFlag)
 509          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 510       if (ctx->Point._Attenuated)
 511          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 512    }
 513
 514    /*
 515     * Lines
 516     */
 517    if (1/*new_state & _NEW_LINE*/) {
 518       if (ctx->Line.SmoothFlag)
 519          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 520       if (ctx->Line.StippleFlag)
 521          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 522    }
 523
 524    /*
 525     * Polygons
 526     */
 527    if (1/*new_state & _NEW_POLYGON*/) {
 528       if (ctx->Polygon.SmoothFlag)
 529          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 530       if (ctx->Polygon.StippleFlag)
 531          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 532       if (ctx->Polygon.FrontMode != GL_FILL
 533           || ctx->Polygon.BackMode != GL_FILL)
 534          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 535       if (ctx->Polygon.CullFlag
 536           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 537          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 538       if (ctx->Polygon.OffsetPoint ||
 539           ctx->Polygon.OffsetLine ||
 540           ctx->Polygon.OffsetFill)
 541          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 542    }
 543
 544    /*
 545     * Lighting and shading
 546     */
 547    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 548       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 549    if (ctx->Light.ShadeModel == GL_FLAT)
 550       ctx->_TriangleCaps |= DD_FLATSHADE;
 551    if (_mesa_need_secondary_color(ctx))
 552       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 553
 554    /*
 555     * Stencil
 556     */
 557    if (ctx->Stencil._TestTwoSide)
 558       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 559 }
 560 #endif
 561
 562
 563 /**
 564  * Compute derived GL state.
 565  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 566  * be called before rendering anything.
 567  *
 568  * Calls dd_function_table::UpdateState to perform any internal state
 569  * management necessary.
 570  *
 571  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 572  * _mesa_update_buffer_bounds(),
 573  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 574  */
 575 void
 576 _mesa_update_state_locked( struct gl_context *ctx )
 577 {
 578    GLbitfield new_state = ctx->NewState;
 579    GLbitfield prog_flags = _NEW_PROGRAM;
 580    GLbitfield new_prog_state = 0x0;
 581
 582    if (new_state == _NEW_CURRENT_ATTRIB)
 583       goto out;
 584
 585    if (MESA_VERBOSE & VERBOSE_STATE)
 586       _mesa_print_state("_mesa_update_state", new_state);
 587
 588    /* Determine which state flags effect vertex/fragment program state */
 589    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 590       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 591                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 592                      _NEW_PROGRAM | _NEW_FRAG_CLAMP);
 593    }
 594    if (ctx->VertexProgram._MaintainTnlProgram) {
 595       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 596                      _NEW_TRANSFORM | _NEW_POINT |
 597                      _NEW_FOG | _NEW_LIGHT |
 598                      _MESA_NEW_NEED_EYE_COORDS);
 599    }
 600
 601    /*
 602     * Now update derived state info
 603     */
 604
 605    if (new_state & prog_flags)
 606       update_program_enables( ctx );
 607
 608    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 609       _mesa_update_modelview_project( ctx, new_state );
 610
 611    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 612       _mesa_update_texture( ctx, new_state );
 613
 614    if (new_state & _NEW_BUFFERS)
 615       _mesa_update_framebuffer(ctx);
 616
 617    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 618       _mesa_update_draw_buffer_bounds( ctx );
 619
 620    if (new_state & _NEW_POLYGON)
 621       update_polygon( ctx );
 622
 623    if (new_state & _NEW_LIGHT)
 624       _mesa_update_lighting( ctx );
 625
 626    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 627       update_twoside( ctx );
 628
 629    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 630       update_clamp_vertex_color(ctx);
 631
 632    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 633       _mesa_update_stencil( ctx );
 634
 635    if (new_state & _NEW_PIXEL)
 636       _mesa_update_pixel( ctx, new_state );
 637
 638    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 639       update_separate_specular( ctx );
 640
 641    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 642       update_viewport_matrix(ctx);
 643
 644    if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))
 645       update_multisample( ctx );
 646
 647    if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
 648       update_clamp_read_color(ctx);
 649
 650    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 651       update_clamp_fragment_color(ctx);
 652
 653 #if 0
 654    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 655                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 656       update_tricaps( ctx, new_state );
 657 #endif
 658
 659    /* ctx->_NeedEyeCoords is now up to date.
 660     *
 661     * If the truth value of this variable has changed, update for the
 662     * new lighting space and recompute the positions of lights and the
 663     * normal transform.
 664     *
 665     * If the lighting space hasn't changed, may still need to recompute
 666     * light positions & normal transforms for other reasons.
 667     */
 668    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 669       _mesa_update_tnl_spaces( ctx, new_state );
 670
 671    if (new_state & prog_flags) {
 672       /* When we generate programs from fixed-function vertex/fragment state
 673        * this call may generate/bind a new program.  If so, we need to
 674        * propogate the _NEW_PROGRAM flag to the driver.
 675        */
 676       new_prog_state |= update_program( ctx );
 677    }
 678
 679    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 680       update_arrays( ctx );
 681
 682  out:
 683    new_prog_state |= update_program_constants(ctx);
 684
 685    /*
 686     * Give the driver a chance to act upon the new_state flags.
 687     * The driver might plug in different span functions, for example.
 688     * Also, this is where the driver can invalidate the state of any
 689     * active modules (such as swrast_setup, swrast, tnl, etc).
 690     *
 691     * Set ctx->NewState to zero to avoid recursion if
 692     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 693     */
 694    new_state = ctx->NewState | new_prog_state;
 695    ctx->NewState = 0;
 696    ctx->Driver.UpdateState(ctx, new_state);
 697    ctx->Array.NewState = 0;
 698    if (!ctx->Array.RebindArrays)
 699       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 700 }
 701
 702
 703 /* This is the usual entrypoint for state updates:
 704  */
 705 void
 706 _mesa_update_state( struct gl_context *ctx )
 707 {
 708    _mesa_lock_context_textures(ctx);
 709    _mesa_update_state_locked(ctx);
 710    _mesa_unlock_context_textures(ctx);
 711 }
 712
 713
 714
 715
 716 /**
 717  * Want to figure out which fragment program inputs are actually
 718  * constant/current values from ctx->Current.  These should be
 719  * referenced as a tracked state variable rather than a fragment
 720  * program input, to save the overhead of putting a constant value in
 721  * every submitted vertex, transferring it to hardware, interpolating
 722  * it across the triangle, etc...
 723  *
 724  * When there is a VP bound, just use vp->outputs.  But when we're
 725  * generating vp from fixed function state, basically want to
 726  * calculate:
 727  *
 728  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 729  *                 potential_vp_outputs )
 730  *
 731  * Where potential_vp_outputs is calculated by looking at enabled
 732  * texgen, etc.
 733  *
 734  * The generated fragment program should then only declare inputs that
 735  * may vary or otherwise differ from the ctx->Current values.
 736  * Otherwise, the fp should track them as state values instead.
 737  */
 738 void
 739 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 740                              GLbitfield varying_inputs )
 741 {
 742    if (ctx->varying_vp_inputs != varying_inputs) {
 743       ctx->varying_vp_inputs = varying_inputs;
 744       ctx->NewState |= _NEW_ARRAY;
 745       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 746    }
 747 }
 748
 749
 750 /**
 751  * Used by drivers to tell core Mesa that the driver is going to
 752  * install/ use its own vertex program.  In particular, this will
 753  * prevent generated fragment programs from using state vars instead
 754  * of ordinary varyings/inputs.
 755  */
 756 void
 757 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 758 {
 759    if (ctx->VertexProgram._Overriden != flag) {
 760       ctx->VertexProgram._Overriden = flag;
 761
 762       /* Set one of the bits which will trigger fragment program
 763        * regeneration:
 764        */
 765       ctx->NewState |= _NEW_PROGRAM;
 766    }
 767 }