src/mesa/main/state.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * 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 "arrayobj.h"
  37 #include "context.h"
  38 #include "debug.h"
  39 #include "macros.h"
  40 #include "ffvertex_prog.h"
  41 #include "framebuffer.h"
  42 #include "light.h"
  43 #include "matrix.h"
  44 #include "pixel.h"
  45 #include "program/program.h"
  46 #include "program/prog_parameter.h"
  47 #include "shaderobj.h"
  48 #include "state.h"
  49 #include "stencil.h"
  50 #include "texenvprogram.h"
  51 #include "texobj.h"
  52 #include "texstate.h"
  53 #include "varray.h"
  54 #include "vbo/vbo.h"
  55 #include "viewport.h"
  56 #include "blend.h"
  57
  58
  59 void
  60 _mesa_update_allow_draw_out_of_order(struct gl_context *ctx)
  61 {
  62    /* Out-of-order drawing is useful when vertex array draws and immediate
  63     * mode are interleaved.
  64     *
  65     * Example with 3 draws:
  66     *   glBegin();
  67     *      glVertex();
  68     *   glEnd();
  69     *   glDrawElements();
  70     *   glBegin();
  71     *      glVertex();
  72     *   glEnd();
  73     *
  74     * Out-of-order drawing changes the execution order like this:
  75     *   glDrawElements();
  76     *   glBegin();
  77     *      glVertex();
  78     *      glVertex();
  79     *   glEnd();
  80     *
  81     * If out-of-order draws are enabled, immediate mode vertices are not
  82     * flushed before glDrawElements, resulting in fewer draws and lower CPU
  83     * overhead. This helps workstation applications.
  84     *
  85     * This is a simplified version of out-of-order determination to catch
  86     * common cases.
  87     *
  88     * RadeonSI has a complete and more complicated out-of-order determination
  89     * for driver-internal reasons.
  90     */
  91    /* Only the compatibility profile with immediate mode needs this. */
  92    if (ctx->API != API_OPENGL_COMPAT || !ctx->Const.AllowDrawOutOfOrder)
  93       return;
  94
  95    /* If all of these are NULL, GLSL is disabled. */
  96    struct gl_program *vs =
  97       ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
  98    struct gl_program *tcs =
  99       ctx->_Shader->CurrentProgram[MESA_SHADER_TESS_CTRL];
 100    struct gl_program *tes =
 101       ctx->_Shader->CurrentProgram[MESA_SHADER_TESS_EVAL];
 102    struct gl_program *gs =
 103       ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY];
 104    struct gl_program *fs =
 105       ctx->_Shader->CurrentProgram[MESA_SHADER_FRAGMENT];
 106    GLenum16 depth_func = ctx->Depth.Func;
 107
 108    /* Z fighting and any primitives with equal Z shouldn't be reordered
 109     * with LESS/LEQUAL/GREATER/GEQUAL functions.
 110     *
 111     * When drawing 2 primitive with equal Z:
 112     * - with LEQUAL/GEQUAL, the last primitive wins the Z test.
 113     * - with LESS/GREATER, the first primitive wins the Z test.
 114     *
 115     * Here we ignore that on the basis that such cases don't occur in real
 116     * apps, and we they do occur, they occur with blending where out-of-order
 117     * drawing is always disabled.
 118     */
 119    bool previous_state = ctx->_AllowDrawOutOfOrder;
 120    ctx->_AllowDrawOutOfOrder =
 121          ctx->DrawBuffer &&
 122          ctx->DrawBuffer->Visual.depthBits &&
 123          ctx->Depth.Test &&
 124          ctx->Depth.Mask &&
 125          (depth_func == GL_NEVER ||
 126           depth_func == GL_LESS ||
 127           depth_func == GL_LEQUAL ||
 128           depth_func == GL_GREATER ||
 129           depth_func == GL_GEQUAL) &&
 130          (!ctx->DrawBuffer->Visual.stencilBits ||
 131           !ctx->Stencil.Enabled) &&
 132          (!ctx->Color.ColorMask ||
 133           (!ctx->Color.BlendEnabled &&
 134            (!ctx->Color.ColorLogicOpEnabled ||
 135             ctx->Color._LogicOp == COLOR_LOGICOP_COPY))) &&
 136          (!vs || !vs->info.writes_memory) &&
 137          (!tes || !tes->info.writes_memory) &&
 138          (!tcs || !tcs->info.writes_memory) &&
 139          (!gs || !gs->info.writes_memory) &&
 140          (!fs || !fs->info.writes_memory || !fs->info.fs.early_fragment_tests);
 141
 142    /* If we are disabling out-of-order drawing, we need to flush queued
 143     * vertices.
 144     */
 145    if (previous_state && !ctx->_AllowDrawOutOfOrder)
 146       FLUSH_VERTICES(ctx, 0);
 147 }
 148
 149
 150 /**
 151  * Update the ctx->*Program._Current pointers to point to the
 152  * current/active programs.
 153  *
 154  * Programs may come from 3 sources: GLSL shaders, ARB/NV_vertex/fragment
 155  * programs or programs derived from fixed-function state.
 156  *
 157  * This function needs to be called after texture state validation in case
 158  * we're generating a fragment program from fixed-function texture state.
 159  *
 160  * \return bitfield which will indicate _NEW_PROGRAM state if a new vertex
 161  * or fragment program is being used.
 162  */
 163 static GLbitfield
 164 update_program(struct gl_context *ctx)
 165 {
 166    struct gl_program *vsProg =
 167       ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX];
 168    struct gl_program *tcsProg =
 169       ctx->_Shader->CurrentProgram[MESA_SHADER_TESS_CTRL];
 170    struct gl_program *tesProg =
 171       ctx->_Shader->CurrentProgram[MESA_SHADER_TESS_EVAL];
 172    struct gl_program *gsProg =
 173       ctx->_Shader->CurrentProgram[MESA_SHADER_GEOMETRY];
 174    struct gl_program *fsProg =
 175       ctx->_Shader->CurrentProgram[MESA_SHADER_FRAGMENT];
 176    struct gl_program *csProg =
 177       ctx->_Shader->CurrentProgram[MESA_SHADER_COMPUTE];
 178    const struct gl_program *prevVP = ctx->VertexProgram._Current;
 179    const struct gl_program *prevFP = ctx->FragmentProgram._Current;
 180    const struct gl_program *prevGP = ctx->GeometryProgram._Current;
 181    const struct gl_program *prevTCP = ctx->TessCtrlProgram._Current;
 182    const struct gl_program *prevTEP = ctx->TessEvalProgram._Current;
 183    const struct gl_program *prevCP = ctx->ComputeProgram._Current;
 184
 185    /*
 186     * Set the ctx->VertexProgram._Current and ctx->FragmentProgram._Current
 187     * pointers to the programs that should be used for rendering.  If either
 188     * is NULL, use fixed-function code paths.
 189     *
 190     * These programs may come from several sources.  The priority is as
 191     * follows:
 192     *   1. OpenGL 2.0/ARB vertex/fragment shaders
 193     *   2. ARB/NV vertex/fragment programs
 194     *   3. ATI fragment shader
 195     *   4. Programs derived from fixed-function state.
 196     *
 197     * Note: it's possible for a vertex shader to get used with a fragment
 198     * program (and vice versa) here, but in practice that shouldn't ever
 199     * come up, or matter.
 200     */
 201
 202    if (fsProg) {
 203       /* Use GLSL fragment shader */
 204       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current, fsProg);
 205       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 206                               NULL);
 207    }
 208    else if (_mesa_arb_fragment_program_enabled(ctx)) {
 209       /* Use user-defined fragment program */
 210       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current,
 211                               ctx->FragmentProgram.Current);
 212       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 213                               NULL);
 214    }
 215    else if (_mesa_ati_fragment_shader_enabled(ctx) &&
 216             ctx->ATIFragmentShader.Current->Program) {
 217        /* Use the enabled ATI fragment shader's associated program */
 218       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current,
 219                               ctx->ATIFragmentShader.Current->Program);
 220       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 221                               NULL);
 222    }
 223    else if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 224       /* Use fragment program generated from fixed-function state */
 225       struct gl_shader_program *f = _mesa_get_fixed_func_fragment_program(ctx);
 226
 227       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current,
 228                               f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 229       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 230                               f->_LinkedShaders[MESA_SHADER_FRAGMENT]->Program);
 231    }
 232    else {
 233       /* No fragment program */
 234       _mesa_reference_program(ctx, &ctx->FragmentProgram._Current, NULL);
 235       _mesa_reference_program(ctx, &ctx->FragmentProgram._TexEnvProgram,
 236                               NULL);
 237    }
 238
 239    if (gsProg) {
 240       /* Use GLSL geometry shader */
 241       _mesa_reference_program(ctx, &ctx->GeometryProgram._Current, gsProg);
 242    } else {
 243       /* No geometry program */
 244       _mesa_reference_program(ctx, &ctx->GeometryProgram._Current, NULL);
 245    }
 246
 247    if (tesProg) {
 248       /* Use GLSL tessellation evaluation shader */
 249       _mesa_reference_program(ctx, &ctx->TessEvalProgram._Current, tesProg);
 250    }
 251    else {
 252       /* No tessellation evaluation program */
 253       _mesa_reference_program(ctx, &ctx->TessEvalProgram._Current, NULL);
 254    }
 255
 256    if (tcsProg) {
 257       /* Use GLSL tessellation control shader */
 258       _mesa_reference_program(ctx, &ctx->TessCtrlProgram._Current, tcsProg);
 259    }
 260    else {
 261       /* No tessellation control program */
 262       _mesa_reference_program(ctx, &ctx->TessCtrlProgram._Current, NULL);
 263    }
 264
 265    /* Examine vertex program after fragment program as
 266     * _mesa_get_fixed_func_vertex_program() needs to know active
 267     * fragprog inputs.
 268     */
 269    if (vsProg) {
 270       /* Use GLSL vertex shader */
 271       assert(VP_MODE_SHADER == ctx->VertexProgram._VPMode);
 272       _mesa_reference_program(ctx, &ctx->VertexProgram._Current, vsProg);
 273    }
 274    else if (_mesa_arb_vertex_program_enabled(ctx)) {
 275       /* Use user-defined vertex program */
 276       assert(VP_MODE_SHADER == ctx->VertexProgram._VPMode);
 277       _mesa_reference_program(ctx, &ctx->VertexProgram._Current,
 278                               ctx->VertexProgram.Current);
 279    }
 280    else if (ctx->VertexProgram._MaintainTnlProgram) {
 281       /* Use vertex program generated from fixed-function state */
 282       assert(VP_MODE_FF == ctx->VertexProgram._VPMode);
 283       _mesa_reference_program(ctx, &ctx->VertexProgram._Current,
 284                               _mesa_get_fixed_func_vertex_program(ctx));
 285       _mesa_reference_program(ctx, &ctx->VertexProgram._TnlProgram,
 286                               ctx->VertexProgram._Current);
 287    }
 288    else {
 289       /* no vertex program */
 290       assert(VP_MODE_FF == ctx->VertexProgram._VPMode);
 291       _mesa_reference_program(ctx, &ctx->VertexProgram._Current, NULL);
 292    }
 293
 294    if (csProg) {
 295       /* Use GLSL compute shader */
 296       _mesa_reference_program(ctx, &ctx->ComputeProgram._Current, csProg);
 297    } else {
 298       /* no compute program */
 299       _mesa_reference_program(ctx, &ctx->ComputeProgram._Current, NULL);
 300    }
 301
 302    /* Let the driver know what's happening:
 303     */
 304    if (ctx->FragmentProgram._Current != prevFP ||
 305        ctx->VertexProgram._Current != prevVP ||
 306        ctx->GeometryProgram._Current != prevGP ||
 307        ctx->TessEvalProgram._Current != prevTEP ||
 308        ctx->TessCtrlProgram._Current != prevTCP ||
 309        ctx->ComputeProgram._Current != prevCP)
 310       return _NEW_PROGRAM;
 311
 312    return 0;
 313 }
 314
 315
 316 static GLbitfield
 317 update_single_program_constants(struct gl_context *ctx,
 318                                 struct gl_program *prog,
 319                                 gl_shader_stage stage)
 320 {
 321    if (prog) {
 322       const struct gl_program_parameter_list *params = prog->Parameters;
 323       if (params && params->StateFlags & ctx->NewState) {
 324          if (ctx->DriverFlags.NewShaderConstants[stage])
 325             ctx->NewDriverState |= ctx->DriverFlags.NewShaderConstants[stage];
 326          else
 327             return _NEW_PROGRAM_CONSTANTS;
 328       }
 329    }
 330    return 0;
 331 }
 332
 333
 334 /**
 335  * This updates fixed-func state constants such as gl_ModelViewMatrix.
 336  * Examine shader constants and return either _NEW_PROGRAM_CONSTANTS or 0.
 337  */
 338 static GLbitfield
 339 update_program_constants(struct gl_context *ctx)
 340 {
 341    GLbitfield new_state =
 342       update_single_program_constants(ctx, ctx->VertexProgram._Current,
 343                                       MESA_SHADER_VERTEX) |
 344       update_single_program_constants(ctx, ctx->FragmentProgram._Current,
 345                                       MESA_SHADER_FRAGMENT);
 346
 347    if (ctx->API == API_OPENGL_COMPAT &&
 348        ctx->Const.GLSLVersionCompat >= 150) {
 349       new_state |=
 350          update_single_program_constants(ctx, ctx->GeometryProgram._Current,
 351                                          MESA_SHADER_GEOMETRY);
 352
 353       if (_mesa_has_ARB_tessellation_shader(ctx)) {
 354          new_state |=
 355             update_single_program_constants(ctx, ctx->TessCtrlProgram._Current,
 356                                             MESA_SHADER_TESS_CTRL) |
 357             update_single_program_constants(ctx, ctx->TessEvalProgram._Current,
 358                                             MESA_SHADER_TESS_EVAL);
 359       }
 360    }
 361
 362    return new_state;
 363 }
 364
 365
 366 /**
 367  * Compute derived GL state.
 368  * If __struct gl_contextRec::NewState is non-zero then this function \b must
 369  * be called before rendering anything.
 370  *
 371  * Calls dd_function_table::UpdateState to perform any internal state
 372  * management necessary.
 373  *
 374  * \sa _mesa_update_modelview_project(), _mesa_update_texture(),
 375  * _mesa_update_buffer_bounds(),
 376  * _mesa_update_lighting() and _mesa_update_tnl_spaces().
 377  */
 378 void
 379 _mesa_update_state_locked( struct gl_context *ctx )
 380 {
 381    GLbitfield new_state = ctx->NewState;
 382    GLbitfield new_prog_state = 0x0;
 383    const GLbitfield computed_states = ~(_NEW_CURRENT_ATTRIB | _NEW_LINE);
 384
 385    /* we can skip a bunch of state validation checks if the dirty
 386     * state matches one or more bits in 'computed_states'.
 387     */
 388    if ((new_state & computed_states) == 0)
 389       goto out;
 390
 391    if (MESA_VERBOSE & VERBOSE_STATE)
 392       _mesa_print_state("_mesa_update_state", new_state);
 393
 394    if (new_state & _NEW_BUFFERS)
 395       _mesa_update_framebuffer(ctx, ctx->ReadBuffer, ctx->DrawBuffer);
 396
 397    /* Handle Core and Compatibility contexts separately. */
 398    if (ctx->API == API_OPENGL_COMPAT ||
 399        ctx->API == API_OPENGLES) {
 400       GLbitfield prog_flags = _NEW_PROGRAM;
 401
 402       /* Determine which state flags effect vertex/fragment program state */
 403       if (ctx->FragmentProgram._MaintainTexEnvProgram) {
 404          prog_flags |= (_NEW_BUFFERS | _NEW_TEXTURE_OBJECT | _NEW_FOG |
 405                         _NEW_VARYING_VP_INPUTS | _NEW_LIGHT | _NEW_POINT |
 406                         _NEW_RENDERMODE | _NEW_PROGRAM | _NEW_FRAG_CLAMP |
 407                         _NEW_COLOR | _NEW_TEXTURE_STATE);
 408       }
 409       if (ctx->VertexProgram._MaintainTnlProgram) {
 410          prog_flags |= (_NEW_VARYING_VP_INPUTS | _NEW_TEXTURE_OBJECT |
 411                         _NEW_TEXTURE_MATRIX | _NEW_TRANSFORM | _NEW_POINT |
 412                         _NEW_FOG | _NEW_LIGHT | _NEW_TEXTURE_STATE |
 413                         _MESA_NEW_NEED_EYE_COORDS);
 414       }
 415
 416       /*
 417        * Now update derived state info
 418        */
 419       if (new_state & (_NEW_MODELVIEW|_NEW_PROJECTION))
 420          _mesa_update_modelview_project( ctx, new_state );
 421
 422       if (new_state & _NEW_TEXTURE_MATRIX)
 423          _mesa_update_texture_matrices(ctx);
 424
 425       if (new_state & (_NEW_TEXTURE_OBJECT | _NEW_TEXTURE_STATE | _NEW_PROGRAM))
 426          _mesa_update_texture_state(ctx);
 427
 428       if (new_state & _NEW_LIGHT)
 429          _mesa_update_lighting(ctx);
 430
 431       if (new_state & _NEW_PIXEL)
 432          _mesa_update_pixel( ctx );
 433
 434       /* ctx->_NeedEyeCoords is now up to date.
 435        *
 436        * If the truth value of this variable has changed, update for the
 437        * new lighting space and recompute the positions of lights and the
 438        * normal transform.
 439        *
 440        * If the lighting space hasn't changed, may still need to recompute
 441        * light positions & normal transforms for other reasons.
 442        */
 443       if (new_state & _MESA_NEW_NEED_EYE_COORDS)
 444          _mesa_update_tnl_spaces( ctx, new_state );
 445
 446       if (new_state & prog_flags) {
 447          /* When we generate programs from fixed-function vertex/fragment state
 448           * this call may generate/bind a new program.  If so, we need to
 449           * propogate the _NEW_PROGRAM flag to the driver.
 450           */
 451          new_prog_state |= update_program(ctx);
 452       }
 453    } else {
 454       /* GL Core and GLES 2/3 contexts */
 455       if (new_state & (_NEW_TEXTURE_OBJECT | _NEW_PROGRAM))
 456          _mesa_update_texture_state(ctx);
 457
 458       if (new_state & _NEW_PROGRAM)
 459          update_program(ctx);
 460    }
 461
 462  out:
 463    new_prog_state |= update_program_constants(ctx);
 464
 465    ctx->NewState |= new_prog_state;
 466
 467    /*
 468     * Give the driver a chance to act upon the new_state flags.
 469     * The driver might plug in different span functions, for example.
 470     * Also, this is where the driver can invalidate the state of any
 471     * active modules (such as swrast_setup, swrast, tnl, etc).
 472     */
 473    ctx->Driver.UpdateState(ctx);
 474    ctx->NewState = 0;
 475 }
 476
 477
 478 /* This is the usual entrypoint for state updates:
 479  */
 480 void
 481 _mesa_update_state( struct gl_context *ctx )
 482 {
 483    _mesa_lock_context_textures(ctx);
 484    _mesa_update_state_locked(ctx);
 485    _mesa_unlock_context_textures(ctx);
 486 }
 487
 488
 489
 490
 491 /**
 492  * Want to figure out which fragment program inputs are actually
 493  * constant/current values from ctx->Current.  These should be
 494  * referenced as a tracked state variable rather than a fragment
 495  * program input, to save the overhead of putting a constant value in
 496  * every submitted vertex, transferring it to hardware, interpolating
 497  * it across the triangle, etc...
 498  *
 499  * When there is a VP bound, just use vp->outputs.  But when we're
 500  * generating vp from fixed function state, basically want to
 501  * calculate:
 502  *
 503  * vp_out_2_fp_in( vp_in_2_vp_out( varying_inputs ) |
 504  *                 potential_vp_outputs )
 505  *
 506  * Where potential_vp_outputs is calculated by looking at enabled
 507  * texgen, etc.
 508  *
 509  * The generated fragment program should then only declare inputs that
 510  * may vary or otherwise differ from the ctx->Current values.
 511  * Otherwise, the fp should track them as state values instead.
 512  */
 513 static void
 514 set_varying_vp_inputs(struct gl_context *ctx, GLbitfield varying_inputs)
 515 {
 516    /*
 517     * The gl_context::varying_vp_inputs value is only used when in
 518     * VP_MODE_FF mode.
 519     */
 520    if (VP_MODE_FF != ctx->VertexProgram._VPMode)
 521       return;
 522
 523    /* Only fixed-func generated programs ever uses varying_vp_inputs. */
 524    if (!ctx->VertexProgram._MaintainTnlProgram &&
 525        !ctx->FragmentProgram._MaintainTexEnvProgram)
 526       return;
 527
 528    if (ctx->varying_vp_inputs != varying_inputs) {
 529       ctx->varying_vp_inputs = varying_inputs;
 530       ctx->NewState |= _NEW_VARYING_VP_INPUTS;
 531    }
 532 }
 533
 534
 535 /**
 536  * Used by drivers to tell core Mesa that the driver is going to
 537  * install/ use its own vertex program.  In particular, this will
 538  * prevent generated fragment programs from using state vars instead
 539  * of ordinary varyings/inputs.
 540  */
 541 void
 542 _mesa_set_vp_override(struct gl_context *ctx, GLboolean flag)
 543 {
 544    if (ctx->VertexProgram._Overriden != flag) {
 545       ctx->VertexProgram._Overriden = flag;
 546
 547       /* Set one of the bits which will trigger fragment program
 548        * regeneration:
 549        */
 550       ctx->NewState |= _NEW_PROGRAM;
 551    }
 552 }
 553
 554
 555 static void
 556 set_vertex_processing_mode(struct gl_context *ctx, gl_vertex_processing_mode m)
 557 {
 558    if (ctx->VertexProgram._VPMode == m)
 559       return;
 560
 561    /* On change we may get new maps into the current values */
 562    ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 563
 564    /* Finally memorize the value */
 565    ctx->VertexProgram._VPMode = m;
 566
 567    /* Since we only track the varying inputs while being in fixed function
 568     * vertex processing mode, we may need to recheck for the
 569     * _NEW_VARYING_VP_INPUTS bit.
 570     */
 571    set_varying_vp_inputs(ctx, ctx->Array._DrawVAOEnabledAttribs);
 572 }
 573
 574
 575 /**
 576  * Update ctx->VertexProgram._VPMode.
 577  * This is to distinguish whether we're running
 578  *   a vertex program/shader,
 579  *   a fixed-function TNL program or
 580  *   a fixed function vertex transformation without any program.
 581  */
 582 void
 583 _mesa_update_vertex_processing_mode(struct gl_context *ctx)
 584 {
 585    if (ctx->_Shader->CurrentProgram[MESA_SHADER_VERTEX])
 586       set_vertex_processing_mode(ctx, VP_MODE_SHADER);
 587    else if (_mesa_arb_vertex_program_enabled(ctx))
 588       set_vertex_processing_mode(ctx, VP_MODE_SHADER);
 589    else
 590       set_vertex_processing_mode(ctx, VP_MODE_FF);
 591 }
 592
 593
 594 /**
 595  * Set the _DrawVAO and the net enabled arrays.
 596  * The vao->_Enabled bitmask is transformed due to position/generic0
 597  * as stored in vao->_AttributeMapMode. Then the filter bitmask is applied
 598  * to filter out arrays unwanted for the currently executed draw operation.
 599  * For example, the generic attributes are masked out form the _DrawVAO's
 600  * enabled arrays when a fixed function array draw is executed.
 601  */
 602 void
 603 _mesa_set_draw_vao(struct gl_context *ctx, struct gl_vertex_array_object *vao,
 604                    GLbitfield filter)
 605 {
 606    struct gl_vertex_array_object **ptr = &ctx->Array._DrawVAO;
 607    bool new_array = false;
 608    if (*ptr != vao) {
 609       _mesa_reference_vao_(ctx, ptr, vao);
 610
 611       new_array = true;
 612    }
 613
 614    if (vao->NewArrays) {
 615       _mesa_update_vao_derived_arrays(ctx, vao);
 616       vao->NewArrays = 0;
 617
 618       new_array = true;
 619    }
 620
 621    /* May shuffle the position and generic0 bits around, filter out unwanted */
 622    const GLbitfield enabled = filter & _mesa_get_vao_vp_inputs(vao);
 623    if (ctx->Array._DrawVAOEnabledAttribs != enabled)
 624       new_array = true;
 625
 626    if (new_array)
 627       ctx->NewDriverState |= ctx->DriverFlags.NewArray;
 628
 629    ctx->Array._DrawVAOEnabledAttribs = enabled;
 630    set_varying_vp_inputs(ctx, enabled);
 631 }