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 "macros.h"
  38 #include "framebuffer.h"
  39 #include "light.h"
  40 #include "matrix.h"
  41 #include "pixel.h"
  42 #include "program/program.h"
  43 #include "program/prog_parameter.h"
  44 #include "shaderobj.h"
  45 #include "state.h"
  46 #include "stencil.h"
  47 #include "texobj.h"
  48 #include "texstate.h"
  49 #include "varray.h"
  50
  51
  52 static void
  53 update_separate_specular(struct gl_context *ctx)
  54 {
  55    if (_mesa_need_secondary_color(ctx))
  56       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
  57    else
  58       ctx->_TriangleCaps &= ~DD_SEPARATE_SPECULAR;
  59 }
  60
  61
  62 /**
  63  * Helper for update_arrays().
  64  * \return  min(current min, array->_MaxElement).
  65  */
  66 static GLuint
  67 update_min(GLuint min, struct gl_client_array *array)
  68 {
  69    _mesa_update_array_max_element(array);
  70    return MIN2(min, array->_MaxElement);
  71 }
  72
  73
  74 /**
  75  * Update ctx->Array._MaxElement (the max legal index into all enabled arrays).
  76  * Need to do this upon new array state or new buffer object state.
  77  */
  78 static void
  79 update_arrays( struct gl_context *ctx )
  80 {
  81    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
  82    GLuint i, min = ~0;
  83
  84    /* find min of _MaxElement values for all enabled arrays.
  85     * Note that the generic arrays always take precedence over
  86     * the legacy arrays.
  87     */
  88
  89    /* 0 */
  90    if (ctx->VertexProgram._Current
  91        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC0].Enabled) {
  92       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC0]);
  93    }
  94    else if (arrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled) {
  95       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_POS]);
  96    }
  97
  98    /* 1 */
  99    if (ctx->VertexProgram._Enabled
 100        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC1].Enabled) {
 101       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC1]);
 102    }
 103    /* no conventional vertex weight array */
 104
 105    /* 2 */
 106    if (ctx->VertexProgram._Enabled
 107        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC2].Enabled) {
 108       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC2]);
 109    }
 110    else if (arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled) {
 111       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL]);
 112    }
 113
 114    /* 3 */
 115    if (ctx->VertexProgram._Enabled
 116        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC3].Enabled) {
 117       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC3]);
 118    }
 119    else if (arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled) {
 120       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0]);
 121    }
 122
 123    /* 4 */
 124    if (ctx->VertexProgram._Enabled
 125        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC4].Enabled) {
 126       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC4]);
 127    }
 128    else if (arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled) {
 129       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1]);
 130    }
 131
 132    /* 5 */
 133    if (ctx->VertexProgram._Enabled
 134        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC5].Enabled) {
 135       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC5]);
 136    }
 137    else if (arrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled) {
 138       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_FOG]);
 139    }
 140
 141    /* 6 */
 142    if (ctx->VertexProgram._Enabled
 143        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC6].Enabled) {
 144       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC6]);
 145    }
 146    else if (arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled) {
 147       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX]);
 148    }
 149
 150    /* 7 */
 151    if (ctx->VertexProgram._Enabled
 152        && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC7].Enabled) {
 153       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC7]);
 154    }
 155
 156    /* 8..15 */
 157    for (i = 0; i < VERT_ATTRIB_TEX_MAX; i++) {
 158       if (ctx->VertexProgram._Enabled
 159           && arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC8 + i].Enabled) {
 160          min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC8 + i]);
 161       }
 162       else if (i < ctx->Const.MaxTextureCoordUnits
 163                && arrayObj->VertexAttrib[VERT_ATTRIB_TEX(i)].Enabled) {
 164          min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_TEX(i)]);
 165       }
 166    }
 167
 168    /* 16..31 */
 169    if (ctx->VertexProgram._Current) {
 170       for (i = 0; i < VERT_ATTRIB_GENERIC_MAX; i++) {
 171          if (arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC(i)].Enabled) {
 172             min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC(i)]);
 173          }
 174       }
 175    }
 176
 177    if (arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled) {
 178       min = update_min(min, &arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG]);
 179    }
 180
 181    /* _MaxElement is one past the last legal array element */
 182    arrayObj->_MaxElement = min;
 183 }
 184
 185
 186 /**
 187  * Update the following fields:
 188  *   ctx->VertexProgram._Enabled
 189  *   ctx->FragmentProgram._Enabled
 190  *   ctx->ATIFragmentShader._Enabled
 191  * This needs to be done before texture state validation.
 192  */
 193 static void
 194 update_program_enables(struct gl_context *ctx)
 195 {
 196    /* These _Enabled flags indicate if the user-defined ARB/NV vertex/fragment
 197     * program is enabled AND valid.  Similarly for ATI fragment shaders.
 198     * GLSL shaders not relevant here.
 199     */
 200    ctx->VertexProgram._Enabled = ctx->VertexProgram.Enabled
 201       && ctx->VertexProgram.Current->Base.Instructions;
 202    ctx->FragmentProgram._Enabled = ctx->FragmentProgram.Enabled
 203       && ctx->FragmentProgram.Current->Base.Instructions;
 204 }
 205
 206
 207 /**
 208  * Update the ctx->Vertex/Geometry/FragmentProgram._Current pointers to point
 209  * to the current/active programs.  Then call ctx->Driver.BindProgram() to
 210  * tell the driver which programs to use.
 211  *
 212  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
 213  * programs or programs derived from fixed-function state.
 214  *
 215  * This function needs to be called after texture state validation in case
 216  * we're generating a fragment program from fixed-function texture state.
 217  *
 218  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 219  * or fragment program is being used.
 220  */
 221 static GLbitfield
 222 update_program(struct gl_context *ctx)
 223 {
 224    const struct gl_shader_program *vsProg = ctx->Shader.CurrentVertexProgram;
 225    struct gl_shader_program *fsProg = ctx->Shader.CurrentFragmentProgram;
 226    const struct gl_vertex_program *prevVP = ctx->VertexProgram._Current;
 227    const struct gl_fragment_program *prevFP = ctx->FragmentProgram._Current;
 228    GLbitfield new_state = 0x0;
 229
 230    /*
 231     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 232     * pointers to the programs that should be used for rendering.  If either
 233     * is NULL, use fixed-function code paths.
 234     *
 235     * These programs may come from several sources.  The priority is as
 236     * follows:
 237     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 238     *   2. ARB/NV vertex/fragment programs
 239     *   3. Programs derived from fixed-function state.
 240     *
 241     * Note: it's possible for a vertex shader to get used with a fragment
 242     * program (and vice versa) here, but in practice that shouldn't ever
 243     * come up, or matter.
 244     */
 245
 246    if (fsProg && fsProg->LinkStatus
 247        && fsProg->_LinkedShaders[MESA_SHADER_FRAGMENT]) {
 248       /* Use GLSL fragment shader */
 249       _mesa_reference_shader_program(ctx,
 250                                      &ctx->Shader._CurrentFragmentProgram,
 251                                      fsProg);
 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_shader_program(ctx,
 259                                      &ctx->Shader._CurrentFragmentProgram,
 260                                      NULL);
 261       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current,
 262                                ctx->FragmentProgram.Current);
 263    }
 264    else {
 265       /* No fragment program */
 266       _mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
 267    }
 268
 269    /* Examine vertex program after fragment program as
 270     * _mesa_get_fixed_func_vertex_program() needs to know active
 271     * fragprog inputs.
 272     */
 273    if (vsProg && vsProg->LinkStatus
 274        && vsProg->_LinkedShaders[MESA_SHADER_VERTEX]) {
 275       /* Use GLSL vertex shader */
 276       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 277                                (struct gl_vertex_program *)
 278                                vsProg->_LinkedShaders[MESA_SHADER_VERTEX]->Program);
 279    }
 280    else if (ctx->VertexProgram._Enabled) {
 281       /* Use user-defined vertex program */
 282       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current,
 283                                ctx->VertexProgram.Current);
 284    }
 285    else {
 286       /* no vertex program */
 287       _mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
 288    }
 289
 290    /* Let the driver know what's happening:
 291     */
 292    if (ctx->FragmentProgram._Current != prevFP) {
 293       new_state |= _NEW_PROGRAM;
 294       if (ctx->Driver.BindProgram) {
 295          ctx->Driver.BindProgram(ctx, GL_FRAGMENT_PROGRAM_ARB,
 296                           (struct gl_program *) ctx->FragmentProgram._Current);
 297       }
 298    }
 299
 300    if (ctx->VertexProgram._Current != prevVP) {
 301       new_state |= _NEW_PROGRAM;
 302       if (ctx->Driver.BindProgram) {
 303          ctx->Driver.BindProgram(ctx, GL_VERTEX_PROGRAM_ARB,
 304                             (struct gl_program *) ctx->VertexProgram._Current);
 305       }
 306    }
 307
 308    return new_state;
 309 }
 310
 311
 312 /**
 313  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 314  */
 315 static GLbitfield
 316 update_program_constants(struct gl_context *ctx)
 317 {
 318    GLbitfield new_state = 0x0;
 319
 320    if (ctx->FragmentProgram._Current) {
 321       const struct gl_program_parameter_list *params =
 322          ctx->FragmentProgram._Current->Base.Parameters;
 323       if (params && params->StateFlags & ctx->NewState) {
 324          new_state |= _NEW_PROGRAM_CONSTANTS;
 325       }
 326    }
 327
 328    if (ctx->VertexProgram._Current) {
 329       const struct gl_program_parameter_list *params =
 330          ctx->VertexProgram._Current->Base.Parameters;
 331       if (params && params->StateFlags & ctx->NewState) {
 332          new_state |= _NEW_PROGRAM_CONSTANTS;
 333       }
 334    }
 335
 336    return new_state;
 337 }
 338
 339
 340
 341
 342 static void
 343 update_viewport_matrix(struct gl_context *ctx)
 344 {
 345    const GLfloat depthMax = ctx->DrawBuffer->_DepthMaxF;
 346
 347    ASSERT(depthMax > 0);
 348
 349    /* Compute scale and bias values. This is really driver-specific
 350     * and should be maintained elsewhere if at all.
 351     * NOTE: RasterPos uses this.
 352     */
 353    _math_matrix_viewport(&ctx->Viewport._WindowMap,
 354                          ctx->Viewport.X, ctx->Viewport.Y,
 355                          ctx->Viewport.Width, ctx->Viewport.Height,
 356                          ctx->Viewport.Near, ctx->Viewport.Far,
 357                          depthMax);
 358 }
 359
 360
 361 /**
 362  * Update the ctx->VertexProgram._TwoSideEnabled flag.
 363  */
 364 static void
 365 update_twoside(struct gl_context *ctx)
 366 {
 367    if (ctx->Shader.CurrentVertexProgram ||
 368        ctx->VertexProgram._Enabled) {
 369       ctx->VertexProgram._TwoSideEnabled = ctx->VertexProgram.TwoSideEnabled;
 370    } else {
 371       ctx->VertexProgram._TwoSideEnabled = (ctx->Light.Enabled &&
 372                                             ctx->Light.Model.TwoSide);
 373    }
 374 }
 375
 376
 377 /*
 378  * Check polygon state and set DD_TRI_CULL_FRONT_BACK and/or DD_TRI_OFFSET
 379  * in ctx->_TriangleCaps if needed.
 380  */
 381 static void
 382 update_polygon(struct gl_context *ctx)
 383 {
 384    ctx->_TriangleCaps &= ~(DD_TRI_CULL_FRONT_BACK | DD_TRI_OFFSET);
 385
 386    if (ctx->Polygon.CullFlag && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 387       ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 388
 389    if (   ctx->Polygon.OffsetPoint
 390        || ctx->Polygon.OffsetLine
 391        || ctx->Polygon.OffsetFill)
 392       ctx->_TriangleCaps |= DD_TRI_OFFSET;
 393 }
 394
 395
 396 /**
 397  * Update the ctx->_TriangleCaps bitfield.
 398  * XXX that bitfield should really go away someday!
 399  * This function must be called after other update_*() functions since
 400  * there are dependencies on some other derived values.
 401  */
 402 #if 0
 403 static void
 404 update_tricaps(struct gl_context *ctx, GLbitfield new_state)
 405 {
 406    ctx->_TriangleCaps = 0;
 407
 408    /*
 409     * Points
 410     */
 411    if (1/*new_state & _NEW_POINT*/) {
 412       if (ctx->Point.SmoothFlag)
 413          ctx->_TriangleCaps |= DD_POINT_SMOOTH;
 414       if (ctx->Point._Attenuated)
 415          ctx->_TriangleCaps |= DD_POINT_ATTEN;
 416    }
 417
 418    /*
 419     * Lines
 420     */
 421    if (1/*new_state & _NEW_LINE*/) {
 422       if (ctx->Line.SmoothFlag)
 423          ctx->_TriangleCaps |= DD_LINE_SMOOTH;
 424       if (ctx->Line.StippleFlag)
 425          ctx->_TriangleCaps |= DD_LINE_STIPPLE;
 426    }
 427
 428    /*
 429     * Polygons
 430     */
 431    if (1/*new_state & _NEW_POLYGON*/) {
 432       if (ctx->Polygon.SmoothFlag)
 433          ctx->_TriangleCaps |= DD_TRI_SMOOTH;
 434       if (ctx->Polygon.StippleFlag)
 435          ctx->_TriangleCaps |= DD_TRI_STIPPLE;
 436       if (ctx->Polygon.FrontMode != GL_FILL
 437           || ctx->Polygon.BackMode != GL_FILL)
 438          ctx->_TriangleCaps |= DD_TRI_UNFILLED;
 439       if (ctx->Polygon.CullFlag
 440           && ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK)
 441          ctx->_TriangleCaps |= DD_TRI_CULL_FRONT_BACK;
 442       if (ctx->Polygon.OffsetPoint ||
 443           ctx->Polygon.OffsetLine ||
 444           ctx->Polygon.OffsetFill)
 445          ctx->_TriangleCaps |= DD_TRI_OFFSET;
 446    }
 447
 448    /*
 449     * Lighting and shading
 450     */
 451    if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 452       ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 453    if (ctx->Light.ShadeModel == GL_FLAT)
 454       ctx->_TriangleCaps |= DD_FLATSHADE;
 455    if (_mesa_need_secondary_color(ctx))
 456       ctx->_TriangleCaps |= DD_SEPARATE_SPECULAR;
 457
 458    /*
 459     * Stencil
 460     */
 461    if (ctx->Stencil._TestTwoSide)
 462       ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 463 }
 464 #endif
 465
 466
 467 /**
 468  * Compute derived GL state.
 469  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 470  * be called before rendering anything.
 471  *
 472  * Calls dd_function_table::UpdateState to perform any internal state
 473  * management necessary.
 474  *
 475  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 476  * _mesa_update_buffer_bounds(),
 477  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 478  */
 479 void
 480 _mesa_update_state_locked( struct gl_context *ctx )
 481 {
 482    GLbitfield new_state = ctx->NewState;
 483    GLbitfield prog_flags = _NEW_PROGRAM;
 484    GLbitfield new_prog_state = 0x0;
 485
 486    if (new_state == _NEW_CURRENT_ATTRIB)
 487       goto out;
 488
 489    /*
 490     * Now update derived state info
 491     */
 492
 493    if (new_state & prog_flags)
 494       update_program_enables( ctx );
 495
 496    if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 497       _mesa_update_modelview_project( ctx, new_state );
 498
 499    if (new_state & (_NEW_PROGRAM|_NEW_TEXTURE|_NEW_TEXTURE_MATRIX))
 500       _mesa_update_texture( ctx, new_state );
 501
 502    if (new_state & _NEW_BUFFERS)
 503       _mesa_update_framebuffer(ctx);
 504
 505    if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 506       _mesa_update_draw_buffer_bounds( ctx );
 507
 508    if (new_state & _NEW_POLYGON)
 509       update_polygon( ctx );
 510
 511    if (new_state & _NEW_LIGHT)
 512       _mesa_update_lighting( ctx );
 513
 514    if (new_state & (_NEW_LIGHT | _NEW_PROGRAM))
 515       update_twoside( ctx );
 516
 517    if (new_state & (_NEW_STENCIL | _NEW_BUFFERS))
 518       _mesa_update_stencil( ctx );
 519
 520    if (new_state & _NEW_PIXEL)
 521       _mesa_update_pixel( ctx, new_state );
 522
 523    if (new_state & _DD_NEW_SEPARATE_SPECULAR)
 524       update_separate_specular( ctx );
 525
 526    if (new_state & (_NEW_BUFFERS | _NEW_VIEWPORT))
 527       update_viewport_matrix(ctx);
 528
 529 #if 0
 530    if (new_state & (_NEW_POINT | _NEW_LINE | _NEW_POLYGON | _NEW_LIGHT
 531                     | _NEW_STENCIL | _DD_NEW_SEPARATE_SPECULAR))
 532       update_tricaps( ctx, new_state );
 533 #endif
 534
 535    /* ctx->_NeedEyeCoords is now up to date.
 536     *
 537     * If the truth value of this variable has changed, update for the
 538     * new lighting space and recompute the positions of lights and the
 539     * normal transform.
 540     *
 541     * If the lighting space hasn't changed, may still need to recompute
 542     * light positions & normal transforms for other reasons.
 543     */
 544    if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 545       _mesa_update_tnl_spaces( ctx, new_state );
 546
 547    if (new_state & prog_flags) {
 548       /* When we generate programs from fixed-function vertex/fragment state
 549        * this call may generate/bind a new program.  If so, we need to
 550        * propogate the _NEW_PROGRAM flag to the driver.
 551        */
 552       new_prog_state |= update_program( ctx );
 553    }
 554
 555    if (new_state & (_NEW_ARRAY | _NEW_PROGRAM | _NEW_BUFFER_OBJECT))
 556       update_arrays( ctx );
 557
 558  out:
 559    new_prog_state |= update_program_constants(ctx);
 560
 561    /*
 562     * Give the driver a chance to act upon the new_state flags.
 563     * The driver might plug in different span functions, for example.
 564     * Also, this is where the driver can invalidate the state of any
 565     * active modules (such as swrast_setup, swrast, tnl, etc).
 566     *
 567     * Set ctx->NewState to zero to avoid recursion if
 568     * Driver.UpdateState() has to call FLUSH_VERTICES().  (fixed?)
 569     */
 570    new_state = ctx->NewState | new_prog_state;
 571    ctx->NewState = 0;
 572    ctx->Driver.UpdateState(ctx, new_state);
 573    ctx->Array.NewState = 0;
 574    if (!ctx->Array.RebindArrays)
 575       ctx->Array.RebindArrays = (new_state & (_NEW_ARRAY | _NEW_PROGRAM)) != 0;
 576 }
 577
 578
 579 /* This is the usual entrypoint for state updates:
 580  */
 581 void
 582 _mesa_update_state( struct gl_context *ctx )
 583 {
 584    _mesa_lock_context_textures(ctx);
 585    _mesa_update_state_locked(ctx);
 586    _mesa_unlock_context_textures(ctx);
 587 }
 588
 589
 590
 591
 592 /**
 593  * Want to figure out which fragment program inputs are actually
 594  * constant/current values from ctx->Current.  These should be
 595  * referenced as a tracked state variable rather than a fragment
 596  * program input, to save the overhead of putting a constant value in
 597  * every submitted vertex, transferring it to hardware, interpolating
 598  * it across the triangle, etc...
 599  *
 600  * When there is a VP bound, just use vp->outputs.  But when we're
 601  * generating vp from fixed function state, basically want to
 602  * calculate:
 603  *
 604  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 605  *                 potential_vp_outputs )
 606  *
 607  * Where potential_vp_outputs is calculated by looking at enabled
 608  * texgen, etc.
 609  *
 610  * The generated fragment program should then only declare inputs that
 611  * may vary or otherwise differ from the ctx->Current values.
 612  * Otherwise, the fp should track them as state values instead.
 613  */
 614 void
 615 _mesa_set_varying_vp_inputs( struct gl_context *ctx,
 616                              GLbitfield64 varying_inputs )
 617 {
 618    if (ctx->varying_vp_inputs != varying_inputs) {
 619       ctx->varying_vp_inputs = varying_inputs;
 620       ctx->NewState |= _NEW_ARRAY;
 621       /*printf("%s %x\n", __FUNCTION__, varying_inputs);*/
 622    }
 623 }
 624
 625
 626 /**
 627  * Used by drivers to tell core Mesa that the driver is going to
 628  * install/ use its own vertex program.  In particular, this will
 629  * prevent generated fragment programs from using state vars instead
 630  * of ordinary varyings/inputs.
 631  */
 632 void
 633 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 634 {
 635    if (ctx->VertexProgram._Overriden != flag) {
 636       ctx->VertexProgram._Overriden = flag;
 637
 638       /* Set one of the bits which will trigger fragment program
 639        * regeneration:
 640        */
 641       ctx->NewState |= _NEW_PROGRAM;
 642    }
 643 }