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    const struct gl_shader_program *gsProg = ctx->Shader.CurrentGeometryProgram;
 229    struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;
 230    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 231    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 232    const struct gl_geometry_program *prevGP = ctx->GeometryProgram._Current;
 233    GLbitfield new_state = 0x0;
 234
 235    /*
 236     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 237     * pointers to the programs that should be used for rendering.  If either
 238     * is NULL, use fixed-function code paths.
 239     *
 240     * These programs may come from several sources.  The priority is as
 241     * follows:
 242     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 243     *   2. ARB/NV vertex/fragment programs
 244     *   3. Programs derived from fixed-function state.
 245     *
 246     * Note: it's possible for a vertex shader to get used with a fragment
 247     * program (and vice versa) here, but in practice that shouldn't ever
 248     * come up, or matter.
 249     */
 250
 251    if (fsProg && fsProg->LinkStatus
 252        && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {
 253       /* Use GLSL fragment shader */
 254       _mesa_reference_shader_program(ctx,
 255                                      &ctx->Shader._CurrentFragmentProgram,
 256                                      fsProg);
 257       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 258                                (struct gl_fragment_program *)
 259                                fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 260       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 261                                NULL);
 262    }
 263    else if (ctx->FragmentProgram._Enabled) {
 264       /* Use user-defined fragment program */
 265       _mesa_reference_shader_program(ctx,
 266                                      &ctx->Shader._CurrentFragmentProgram,
 267                                      NULL);
 268       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 269                                ctx->FragmentProgram.Current);
 270       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 271                                NULL);
 272    }
 273    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 274       /* Use fragment program generated from fixed-function state */
 275       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 276
 277       _mesa_reference_shader_program(ctx,
 278                                      &ctx->Shader._CurrentFragmentProgram,
 279                                      f);
 280       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 281                                (struct gl_fragment_program *)
 282                                f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 283       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 284                                (struct gl_fragment_program *)
 285                                f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 286    }
 287    else {
 288       /* No fragment program */
 289       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 290       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram,
 291                                NULL);
 292    }
 293
 294    if (gsProg && gsProg->LinkStatus
 295        && gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]) {
 296       /* Use GLSL geometry shader */
 297       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current,
 298                                (struct gl_geometry_program *)
 299                                gsProg->_LinkedShaders[MESA_SHADER_GEOMETRY]->Program);
 300    } else {
 301       /* No geometry program */
 302       _mesa_reference_geomprog(ctx, &ctx->GeometryProgram._Current, NULL);
 303    }
 304
 305    /* Examine vertex program after fragment program as
 306     * _mesa_get_fixed_func_vertex_program() needs to know active
 307     * fragprog inputs.
 308     */
 309    if (vsProg && vsProg->LinkStatus
 310        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 311       /* Use GLSL vertex shader */
 312       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 313                                (struct gl_vertex_program *)
 314                                vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program);
 315    }
 316    else if (ctx->VertexProgram._Enabled) {
 317       /* Use user-defined vertex program */
 318       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 319                                ctx->VertexProgram.Current);
 320    }
 321    else if (ctx->VertexProgram._MaintainTnlProgram) {
 322       /* Use vertex program generated from fixed-function state */
 323       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 324                                _mesa_get_fixed_func_vertex_program(ctx));
 325       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram,
 326                                ctx->VertexProgram._Current);
 327    }
 328    else {
 329       /* no vertex program */
 330       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 331    }
 332
 333    /* Let the driver know what's happening:
 334     */
 335    if (ctx->FragmentProgram._Current != prevFP) {
 336       new_state |= _NEW_PROGRAM;
 337       if (ctx->Driver.BindProgram) {
 338          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 339                           (struct gl_program *) ctx->FragmentProgram._Current);
 340       }
 341    }
 342
 343    if (ctx->GeometryProgram._Current != prevGP) {
 344       new_state |= _NEW_PROGRAM;
 345       if (ctx->Driver.BindProgram) {
 346          ctx->Driver.BindProgram(ctx, MESA_GEOMETRY_PROGRAM,
 347                             (struct gl_program *) ctx->GeometryProgram._Current);
 348       }
 349    }
 350
 351    if (ctx->VertexProgram._Current != prevVP) {
 352       new_state |= _NEW_PROGRAM;
 353       if (ctx->Driver.BindProgram) {
 354          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 355                             (struct gl_program *) ctx->VertexProgram._Current);
 356       }
 357    }
 358
 359    return new_state;
 360 }
 361
 362
 363 /**
 364  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 365  */
 366 static GLbitfield
 367 update_program_constants(struct gl_context *ctx)
 368 {
 369    GLbitfield new_state = 0x0;
 370
 371    if (ctx->FragmentProgram._Current) {
 372       const struct gl_program_parameter_list *params =
 373          ctx->FragmentProgram._Current->Base.Parameters;
 374       if (params && params->StateFlags & ctx->NewState) {
 375          new_state |= _NEW_PROGRAM_CONSTANTS;
 376       }
 377    }
 378
 379    if (ctx->GeometryProgram._Current) {
 380       const struct gl_program_parameter_list *params =
 381          ctx->GeometryProgram._Current->Base.Parameters;
 382       /*FIXME: StateFlags is always 0 because we have unnamed constant
 383        *       not state changes */
 384       if (params /*&& params->StateFlags & ctx->NewState*/) {
 385          new_state |= _NEW_PROGRAM_CONSTANTS;
 386       }
 387    }
 388
 389    if (ctx->VertexProgram._Current) {
 390       const struct gl_program_parameter_list *params =
 391          ctx->VertexProgram._Current->Base.Parameters;
 392       if (params && params->StateFlags & ctx->NewState) {
 393          new_state |= _NEW_PROGRAM_CONSTANTS;
 394       }
 395    }
 396
 397    return new_state;
 398 }
 399
 400
 401
 402
 403 static void
 404 update_viewport_matrix(struct gl_context *ctx)
 405 {
 406    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 407
 408    ASSERT(depthMax > 0);
 409
 410    /* Compute scale and bias values. This is really driver-specific
 411     * and should be maintained elsewhere if at all.
 412     * NOTE: RasterPos uses this.
 413     */
 414    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 415                          ctx->Viewport.X, ctx->Viewport.Y,
 416                          ctx->Viewport.Width, ctx->Viewport.Height,
 417                          ctx->Viewport.Near, ctx->Viewport.Far,
 418                          depthMax);
 419 }
 420
 421
 422 /**
 423  * Update derived multisample state.
 424  */
 425 static void
 426 update_multisample(struct gl_context *ctx)
 427 {
 428    ctx->Multisample._Enabled = GL_FALSE;
 429    if (ctx->Multisample.Enabled &&
 430        ctx->DrawBuffer &&
 431        ctx->DrawBuffer->Visual.sampleBuffers)
 432       ctx->Multisample._Enabled = GL_TRUE;
 433 }
 434
 435
 436 /**
 437  * Update the ctx->Color._ClampFragmentColor field
 438  */
 439 static void
 440 update_clamp_fragment_color(struct gl_context *ctx)
 441 {
 442    if (ctx->Color.ClampFragmentColor == GL_FIXED_ONLY_ARB)
 443       ctx->Color._ClampFragmentColor =
 444          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 445    else
 446       ctx->Color._ClampFragmentColor = ctx->Color.ClampFragmentColor;
 447 }
 448
 449
 450 /**
 451  * Update the ctx->Color._ClampVertexColor field
 452  */
 453 static void
 454 update_clamp_vertex_color(struct gl_context *ctx)
 455 {
 456    if (ctx->Light.ClampVertexColor == GL_FIXED_ONLY_ARB)
 457       ctx->Light._ClampVertexColor =
 458          !ctx->DrawBuffer || !ctx->DrawBuffer->Visual.floatMode;
 459    else
 460       ctx->Light._ClampVertexColor = ctx->Light.ClampVertexColor;
 461 }
 462
 463
 464 /**
 465  * Update the ctx->Color._ClampReadColor field
 466  */
 467 static void
 468 update_clamp_read_color(struct gl_context *ctx)
 469 {
 470    if (ctx->Color.ClampReadColor == GL_FIXED_ONLY_ARB)
 471       ctx->Color._ClampReadColor =
 472          !ctx->ReadBuffer || !ctx->ReadBuffer->Visual.floatMode;
 473    else
 474       ctx->Color._ClampReadColor = ctx->Color.ClampReadColor;
 475 }
 476
 477 /**
 478  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 479  */
 480 static void
 481 update_twoside(struct gl_context *ctx)
 482 {
 483    if (ctx->Shader.CurrentVertexProgram ||
 484        ctx->VertexProgram._Enabled) {
 485       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 486    } else {
 487       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 488                                             ctx->Light.Model.TwoSide);
 489    }
 490 }
 491
 492
 493 /*
 494  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 495  * in ctx->_TriangleCaps if needed.
 496  */
 497 static void
 498 update_polygon(struct gl_context *ctx)
 499 {
 500    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 501
 502    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 503       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 504
 505    if (   ctx->Polygon.OffsetPoint
 506        || ctx->Polygon.OffsetLine
 507        || ctx->Polygon.OffsetFill)
 508       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 509 }
 510
 511
 512 /**
 513  * Update the ctx->_TriangleCaps bitfield.
 514  * XXX that bitfield should really go away someday!
 515  * This function must be called after other update_*() functions since
 516  * there are dependencies on some other derived values.
 517  */
 518 #if 0
 519 static void
 520 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 521 {
 522    ctx->_TriangleCaps = 0;
 523
 524    /*
 525     * Points
 526     */
 527    if (1/*new_state & _NEW_POINT*/) {
 528       if (ctx->Point.SmoothFlag)
 529          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 530       if (ctx->Point._Attenuated)
 531          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 532    }
 533
 534    /*
 535     * Lines
 536     */
 537    if (1/*new_state & _NEW_LINE*/) {
 538       if (ctx->Line.SmoothFlag)
 539          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 540       if (ctx->Line.StippleFlag)
 541          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 542    }
 543
 544    /*
 545     * Polygons
 546     */
 547    if (1/*new_state & _NEW_POLYGON*/) {
 548       if (ctx->Polygon.SmoothFlag)
 549          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 550       if (ctx->Polygon.StippleFlag)
 551          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 552       if (ctx->Polygon.FrontMode != GL_FILL
 553           || ctx->Polygon.BackMode != GL_FILL)
 554          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 555       if (ctx->Polygon.CullFlag
 556           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 557          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 558       if (ctx->Polygon.OffsetPoint ||
 559           ctx->Polygon.OffsetLine ||
 560           ctx->Polygon.OffsetFill)
 561          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 562    }
 563
 564    /*
 565     * Lighting and shading
 566     */
 567    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 568       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 569    if (ctx->Light.ShadeModel == GL_FLAT)
 570       ctx->_TriangleCaps |= DD_FLATSHADE;
 571    if (_mesa_need_secondary_color(ctx))
 572       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 573
 574    /*
 575     * Stencil
 576     */
 577    if (ctx->Stencil._TestTwoSide)
 578       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 579 }
 580 #endif
 581
 582
 583 /**
 584  * Compute derived GL state.
 585  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 586  * be called before rendering anything.
 587  *
 588  * Calls dd_function_table::UpdateState to perform any internal state
 589  * management necessary.
 590  *
 591  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 592  * _mesa_update_buffer_bounds(),
 593  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 594  */
 595 void
 596 _mesa_update_state_locked( struct gl_context *ctx )
 597 {
 598    GLbitfield new_state = ctx->NewState;
 599    GLbitfield prog_flags = _NEW_PROGRAM;
 600    GLbitfield new_prog_state = 0x0;
 601
 602    if (new_state == _NEW_CURRENT_ATTRIB)
 603       goto out;
 604
 605    if (MESA_VERBOSE & VERBOSE_STATE)
 606       _mesa_print_state("_mesa_update_state", new_state);
 607
 608    /* Determine which state flags effect vertex/fragment program state */
 609    if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 610       prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE | _NEW_FOG |
 611                      _NEW_ARRAY | _NEW_LIGHT | _NEW_POINT | _NEW_RENDERMODE |
 612                      _NEW_PROGRAM | _NEW_FRAG_CLAMP | _NEW_COLOR);
 613    }
 614    if (ctx->VertexProgram._MaintainTnlProgram) {
 615       prog_flags |= (_NEW_ARRAY | _NEW_TEXTURE | _NEW_TEXTURE_MATRIX |
 616                      _NEW_TRANSFORM | _NEW_POINT |
 617                      _NEW_FOG | _NEW_LIGHT |
 618                      _MESA_NEW_NEED_EYE_COORDS);
 619    }
 620
 621    /*
 622     * Now update derived state info
 623     */
 624
 625    if (new_state & prog_flags)
 626       update_program_enables( ctx );
 627
 628    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 629       _mesa_update_modelview_project( ctx, new_state );
 630
 631    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 632       _mesa_update_texture( ctx, new_state );
 633
 634    if (new_state & _NEW_BUFFERS)
 635       _mesa_update_framebuffer(ctx);
 636
 637    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 638       _mesa_update_draw_buffer_bounds( ctx );
 639
 640    if (new_state & _NEW_POLYGON)
 641       update_polygon( ctx );
 642
 643    if (new_state & _NEW_LIGHT)
 644       _mesa_update_lighting( ctx );
 645
 646    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 647       update_twoside( ctx );
 648
 649    if (new_state & (_NEW_LIGHT | _NEW_BUFFERS))
 650       update_clamp_vertex_color(ctx);
 651
 652    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 653       _mesa_update_stencil( ctx );
 654
 655    if (new_state & _NEW_PIXEL)
 656       _mesa_update_pixel( ctx, new_state );
 657
 658    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 659       update_separate_specular( ctx );
 660
 661    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 662       update_viewport_matrix(ctx);
 663
 664    if (new_state & (_NEW_MULTISAMPLE | _NEW_BUFFERS))
 665       update_multisample( ctx );
 666
 667    if (new_state & (_NEW_COLOR | _NEW_BUFFERS))
 668       update_clamp_read_color(ctx);
 669
 670    if(new_state & (_NEW_FRAG_CLAMP | _NEW_BUFFERS))
 671       update_clamp_fragment_color(ctx);
 672
 673 #if 0
 674    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 675                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 676       update_tricaps( ctx, new_state );
 677 #endif
 678
 679    /* ctx->_NeedEyeCoords is now up to date.
 680     *
 681     * If the truth value of this variable has changed, update for the
 682     * new lighting space and recompute the positions of lights and the
 683     * normal transform.
 684     *
 685     * If the lighting space hasn't changed, may still need to recompute
 686     * light positions & normal transforms for other reasons.
 687     */
 688    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 689       _mesa_update_tnl_spaces( ctx, new_state );
 690
 691    if (new_state & prog_flags) {
 692       /* When we generate programs from fixed-function vertex/fragment state
 693        * this call may generate/bind a new program.  If so, we need to
 694        * propogate the _NEW_PROGRAM flag to the driver.
 695        */
 696       new_prog_state |= update_program( ctx );
 697    }
 698
 699    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 700       update_arrays( ctx );
 701
 702  out:
 703    new_prog_state |= update_program_constants(ctx);
 704
 705    /*
 706     * Give the driver a chance to act upon the new_state flags.
 707     * The driver might plug in different span functions, for example.
 708     * Also, this is where the driver can invalidate the state of any
 709     * active modules (such as swrast_setup, swrast, tnl, etc).
 710     *
 711     * Set ctx->NewState to zero to avoid recursion if
 712     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 713     */
 714    new_state = ctx->NewState | new_prog_state;
 715    ctx->NewState = 0;
 716    ctx->Driver.UpdateState(ctx, new_state);
 717    ctx->Array.NewState = 0;
 718    if (!ctx->Array.RebindArrays)
 719       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 720 }
 721
 722
 723 /* This is the usual entrypoint for state updates:
 724  */
 725 void
 726 _mesa_update_state( struct gl_context *ctx )
 727 {
 728    _mesa_lock_context_textures(ctx);
 729    _mesa_update_state_locked(ctx);
 730    _mesa_unlock_context_textures(ctx);
 731 }
 732
 733
 734
 735
 736 /**
 737  * Want to figure out which fragment program inputs are actually
 738  * constant/current values from ctx->Current.  These should be
 739  * referenced as a tracked state variable rather than a fragment
 740  * program input, to save the overhead of putting a constant value in
 741  * every submitted vertex, transferring it to hardware, interpolating
 742  * it across the triangle, etc...
 743  *
 744  * When there is a VP bound, just use vp->outputs.  But when we're
 745  * generating vp from fixed function state, basically want to
 746  * calculate:
 747  *
 748  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 749  *                 potential_vp_outputs )
 750  *
 751  * Where potential_vp_outputs is calculated by looking at enabled
 752  * texgen, etc.
 753  *
 754  * The generated fragment program should then only declare inputs that
 755  * may vary or otherwise differ from the ctx->Current values.
 756  * Otherwise, the fp should track them as state values instead.
 757  */
 758 void
 759 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 760                              GLbitfield64 varying_inputs )
 761 {
 762    if (ctx->varying_vp_inputs != varying_inputs) {
 763       ctx->varying_vp_inputs = varying_inputs;
 764       ctx->NewState |= _NEW_ARRAY;
 765       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 766    }
 767 }
 768
 769
 770 /**
 771  * Used by drivers to tell core Mesa that the driver is going to
 772  * install/ use its own vertex program.  In particular, this will
 773  * prevent generated fragment programs from using state vars instead
 774  * of ordinary varyings/inputs.
 775  */
 776 void
 777 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 778 {
 779    if (ctx->VertexProgram._Overriden != flag) {
 780       ctx->VertexProgram._Overriden = flag;
 781
 782       /* Set one of the bits which will trigger fragment program
 783        * regeneration:
 784        */
 785       ctx->NewState |= _NEW_PROGRAM;
 786    }
 787 }