src/mesa/swrast/s_context.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  * Authors:
  25  *    Keith Whitwell <keithw@vmware.com> Brian Paul
  26  */
  27
  28 #include "main/imports.h"
  29 #include "main/bufferobj.h"
  30 #include "main/mtypes.h"
  31 #include "main/samplerobj.h"
  32 #include "main/state.h"
  33 #include "main/stencil.h"
  34 #include "main/teximage.h"
  35 #include "program/prog_parameter.h"
  36 #include "program/prog_statevars.h"
  37 #include "swrast.h"
  38 #include "s_blend.h"
  39 #include "s_context.h"
  40 #include "s_lines.h"
  41 #include "s_points.h"
  42 #include "s_span.h"
  43 #include "s_texfetch.h"
  44 #include "s_triangle.h"
  45 #include "s_texfilter.h"
  46
  47
  48 /**
  49  * Recompute the value of swrast->_RasterMask, etc. according to
  50  * the current context.  The _RasterMask field can be easily tested by
  51  * drivers to determine certain basic GL state (does the primitive need
  52  * stenciling, logic-op, fog, etc?).
  53  */
  54 static void
  55 _swrast_update_rasterflags( struct gl_context *ctx )
  56 {
  57    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  58    GLbitfield rasterMask = 0;
  59    GLuint i;
  60
  61    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  62    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  63    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  64    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  65    if (ctx->Scissor.EnableFlags)          rasterMask |= CLIP_BIT;
  66    if (_mesa_stencil_is_enabled(ctx))     rasterMask |= STENCIL_BIT;
  67    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  68       if (!ctx->Color.ColorMask[i][0] ||
  69           !ctx->Color.ColorMask[i][1] ||
  70           !ctx->Color.ColorMask[i][2] ||
  71           !ctx->Color.ColorMask[i][3]) {
  72          rasterMask |= MASKING_BIT;
  73          break;
  74       }
  75    }
  76    if (ctx->Color.ColorLogicOpEnabled) rasterMask |= LOGIC_OP_BIT;
  77    if (ctx->Texture._MaxEnabledTexImageUnit >= 0) rasterMask |= TEXTURE_BIT;
  78    if (   ctx->ViewportArray[0].X < 0
  79        || ctx->ViewportArray[0].X + ctx->ViewportArray[0].Width > (GLfloat) ctx->DrawBuffer->Width
  80        || ctx->ViewportArray[0].Y < 0
  81        || ctx->ViewportArray[0].Y + ctx->ViewportArray[0].Height > (GLfloat) ctx->DrawBuffer->Height) {
  82       rasterMask |= CLIP_BIT;
  83    }
  84
  85    if (ctx->Query.CurrentOcclusionObject)
  86       rasterMask |= OCCLUSION_BIT;
  87
  88
  89    /* If we're not drawing to exactly one color buffer set the
  90     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  91     * buffers or the RGBA or CI mask disables all writes.
  92     */
  93    if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
  94       /* more than one color buffer designated for writing (or zero buffers) */
  95       rasterMask |= MULTI_DRAW_BIT;
  96    }
  97
  98    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  99       if (ctx->Color.ColorMask[i][0] +
 100           ctx->Color.ColorMask[i][1] +
 101           ctx->Color.ColorMask[i][2] +
 102           ctx->Color.ColorMask[i][3] == 0) {
 103          rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 104          break;
 105       }
 106    }
 107
 108
 109    if (_swrast_use_fragment_program(ctx)) {
 110       rasterMask |= FRAGPROG_BIT;
 111    }
 112
 113    if (_mesa_ati_fragment_shader_enabled(ctx)) {
 114       rasterMask |= ATIFRAGSHADER_BIT;
 115    }
 116
 117 #if CHAN_TYPE == GL_FLOAT
 118    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 119       rasterMask |= CLAMPING_BIT;
 120    }
 121 #endif
 122
 123    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 124 }
 125
 126
 127 /**
 128  * Examine polygon cull state to compute the _BackfaceCullSign field.
 129  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 130  * and 1 if culling front-faces.  The Polygon FrontFace state also
 131  * factors in.
 132  */
 133 static void
 134 _swrast_update_polygon( struct gl_context *ctx )
 135 {
 136    GLfloat backface_sign;
 137
 138    if (ctx->Polygon.CullFlag) {
 139       switch (ctx->Polygon.CullFaceMode) {
 140       case GL_BACK:
 141          backface_sign = -1.0F;
 142          break;
 143       case GL_FRONT:
 144          backface_sign = 1.0F;
 145          break;
 146       case GL_FRONT_AND_BACK:
 147          /* fallthrough */
 148       default:
 149          backface_sign = 0.0F;
 150       }
 151    }
 152    else {
 153       backface_sign = 0.0F;
 154    }
 155
 156    SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
 157
 158    /* This is for front/back-face determination, but not for culling */
 159    SWRAST_CONTEXT(ctx)->_BackfaceSign
 160       = (ctx->Polygon.FrontFace == GL_CW) ? -1.0F : 1.0F;
 161 }
 162
 163
 164
 165 /**
 166  * Update the _PreferPixelFog field to indicate if we need to compute
 167  * fog blend factors (from the fog coords) per-fragment.
 168  */
 169 static void
 170 _swrast_update_fog_hint( struct gl_context *ctx )
 171 {
 172    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 173    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 174                               _swrast_use_fragment_program(ctx) ||
 175                               (ctx->Hint.Fog == GL_NICEST &&
 176                                swrast->AllowPixelFog));
 177 }
 178
 179
 180
 181 /**
 182  * Update the swrast->_TextureCombinePrimary flag.
 183  */
 184 static void
 185 _swrast_update_texture_env( struct gl_context *ctx )
 186 {
 187    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 188    GLuint i;
 189
 190    swrast->_TextureCombinePrimary = GL_FALSE;
 191
 192    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 193       const struct gl_tex_env_combine_state *combine =
 194          ctx->Texture.Unit[i]._CurrentCombine;
 195       GLuint term;
 196       for (term = 0; term < combine->_NumArgsRGB; term++) {
 197          if (combine->SourceRGB[term] == GL_PRIMARY_COLOR) {
 198             swrast->_TextureCombinePrimary = GL_TRUE;
 199             return;
 200          }
 201          if (combine->SourceA[term] == GL_PRIMARY_COLOR) {
 202             swrast->_TextureCombinePrimary = GL_TRUE;
 203             return;
 204          }
 205       }
 206    }
 207 }
 208
 209
 210 /**
 211  * Determine if we can defer texturing/shading until after Z/stencil
 212  * testing.  This potentially allows us to skip texturing/shading for
 213  * lots of fragments.
 214  */
 215 static void
 216 _swrast_update_deferred_texture(struct gl_context *ctx)
 217 {
 218    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 219    if (ctx->Color.AlphaEnabled) {
 220       /* alpha test depends on post-texture/shader colors */
 221       swrast->_DeferredTexture = GL_FALSE;
 222    }
 223    else {
 224       GLboolean use_fprog = _swrast_use_fragment_program(ctx);
 225       const struct gl_program *fprog = ctx->FragmentProgram._Current;
 226       if (use_fprog &&
 227           (fprog->info.outputs_written & (1 << FRAG_RESULT_DEPTH))) {
 228          /* Z comes from fragment program/shader */
 229          swrast->_DeferredTexture = GL_FALSE;
 230       }
 231       else if (use_fprog && fprog->info.fs.uses_discard) {
 232          swrast->_DeferredTexture = GL_FALSE;
 233       }
 234       else if (ctx->Query.CurrentOcclusionObject) {
 235          /* occlusion query depends on shader discard/kill results */
 236          swrast->_DeferredTexture = GL_FALSE;
 237       }
 238       else {
 239          swrast->_DeferredTexture = GL_TRUE;
 240       }
 241    }
 242 }
 243
 244
 245 /**
 246  * Update swrast->_FogColor and swrast->_FogEnable values.
 247  */
 248 static void
 249 _swrast_update_fog_state( struct gl_context *ctx )
 250 {
 251    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 252    const struct gl_program *fp = ctx->FragmentProgram._Current;
 253
 254    assert(fp == NULL || fp->Target == GL_FRAGMENT_PROGRAM_ARB);
 255    (void) fp; /* silence unused var warning */
 256
 257    /* determine if fog is needed, and if so, which fog mode */
 258    swrast->_FogEnabled = (!_swrast_use_fragment_program(ctx) &&
 259                           ctx->Fog.Enabled);
 260 }
 261
 262
 263 /**
 264  * Update state for running fragment programs.  Basically, load the
 265  * program parameters with current state values.
 266  */
 267 static void
 268 _swrast_update_fragment_program(struct gl_context *ctx, GLbitfield newState)
 269 {
 270    if (!_swrast_use_fragment_program(ctx))
 271       return;
 272
 273    _mesa_load_state_parameters(ctx,
 274                                ctx->FragmentProgram._Current->Parameters);
 275 }
 276
 277
 278 /**
 279  * See if we can do early diffuse+specular (primary+secondary) color
 280  * add per vertex instead of per-fragment.
 281  */
 282 static void
 283 _swrast_update_specular_vertex_add(struct gl_context *ctx)
 284 {
 285    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 286    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 287       (ctx->Light.Enabled &&
 288        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 289
 290    swrast->SpecularVertexAdd = (separateSpecular
 291                                 && ctx->Texture._MaxEnabledTexImageUnit == -1
 292                                 && !_swrast_use_fragment_program(ctx)
 293                                 && !_mesa_ati_fragment_shader_enabled(ctx));
 294 }
 295
 296
 297 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 298                              _NEW_PROGRAM_CONSTANTS |   \
 299                              _NEW_TEXTURE |             \
 300                              _NEW_HINT |                \
 301                              _NEW_POLYGON )
 302
 303 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 304  */
 305 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 306                               _NEW_RENDERMODE|                  \
 307                               _NEW_POLYGON|                     \
 308                               _NEW_DEPTH|                       \
 309                               _NEW_STENCIL|                     \
 310                               _NEW_COLOR|                       \
 311                               _NEW_TEXTURE|                     \
 312                               _SWRAST_NEW_RASTERMASK|           \
 313                               _NEW_LIGHT|                       \
 314                               _NEW_FOG |                        \
 315                               _MESA_NEW_SEPARATE_SPECULAR)
 316
 317 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 318                           _NEW_RENDERMODE|              \
 319                           _NEW_LINE|                    \
 320                           _NEW_TEXTURE|                 \
 321                           _NEW_LIGHT|                   \
 322                           _NEW_FOG|                     \
 323                           _NEW_DEPTH |                  \
 324                           _MESA_NEW_SEPARATE_SPECULAR)
 325
 326 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 327                            _NEW_RENDERMODE |            \
 328                            _NEW_POINT |                 \
 329                            _NEW_TEXTURE |               \
 330                            _NEW_LIGHT |                 \
 331                            _NEW_FOG |                   \
 332                            _MESA_NEW_SEPARATE_SPECULAR)
 333
 334 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 335
 336 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 337
 338 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 339
 340
 341
 342 /**
 343  * Stub for swrast->Triangle to select a true triangle function
 344  * after a state change.
 345  */
 346 static void
 347 _swrast_validate_triangle( struct gl_context *ctx,
 348                            const SWvertex *v0,
 349                            const SWvertex *v1,
 350                            const SWvertex *v2 )
 351 {
 352    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 353
 354    _swrast_validate_derived( ctx );
 355    swrast->choose_triangle( ctx );
 356    assert(swrast->Triangle);
 357
 358    if (swrast->SpecularVertexAdd) {
 359       /* separate specular color, but no texture */
 360       swrast->SpecTriangle = swrast->Triangle;
 361       swrast->Triangle = _swrast_add_spec_terms_triangle;
 362    }
 363
 364    swrast->Triangle( ctx, v0, v1, v2 );
 365 }
 366
 367 /**
 368  * Called via swrast->Line.  Examine current GL state and choose a software
 369  * line routine.  Then call it.
 370  */
 371 static void
 372 _swrast_validate_line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 373 {
 374    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 375
 376    _swrast_validate_derived( ctx );
 377    swrast->choose_line( ctx );
 378    assert(swrast->Line);
 379
 380    if (swrast->SpecularVertexAdd) {
 381       swrast->SpecLine = swrast->Line;
 382       swrast->Line = _swrast_add_spec_terms_line;
 383    }
 384
 385    swrast->Line( ctx, v0, v1 );
 386 }
 387
 388 /**
 389  * Called via swrast->Point.  Examine current GL state and choose a software
 390  * point routine.  Then call it.
 391  */
 392 static void
 393 _swrast_validate_point( struct gl_context *ctx, const SWvertex *v0 )
 394 {
 395    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 396
 397    _swrast_validate_derived( ctx );
 398    swrast->choose_point( ctx );
 399
 400    if (swrast->SpecularVertexAdd) {
 401       swrast->SpecPoint = swrast->Point;
 402       swrast->Point = _swrast_add_spec_terms_point;
 403    }
 404
 405    swrast->Point( ctx, v0 );
 406 }
 407
 408
 409 /**
 410  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 411  * function, then call it.
 412  */
 413 static void
 414 _swrast_validate_blend_func(struct gl_context *ctx, GLuint n, const GLubyte mask[],
 415                             GLvoid *src, const GLvoid *dst,
 416                             GLenum chanType )
 417 {
 418    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 419
 420    _swrast_validate_derived( ctx ); /* why is this needed? */
 421    _swrast_choose_blend_func( ctx, chanType );
 422
 423    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 424 }
 425
 426 static void
 427 _swrast_sleep( struct gl_context *ctx, GLbitfield new_state )
 428 {
 429    (void) ctx; (void) new_state;
 430 }
 431
 432
 433 static void
 434 _swrast_invalidate_state( struct gl_context *ctx, GLbitfield new_state )
 435 {
 436    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 437    GLuint i;
 438
 439    swrast->NewState |= new_state;
 440
 441    /* After 10 statechanges without any swrast functions being called,
 442     * put the module to sleep.
 443     */
 444    if (++swrast->StateChanges > 10) {
 445       swrast->InvalidateState = _swrast_sleep;
 446       swrast->NewState = ~0;
 447       new_state = ~0;
 448    }
 449
 450    if (new_state & swrast->InvalidateTriangleMask)
 451       swrast->Triangle = _swrast_validate_triangle;
 452
 453    if (new_state & swrast->InvalidateLineMask)
 454       swrast->Line = _swrast_validate_line;
 455
 456    if (new_state & swrast->InvalidatePointMask)
 457       swrast->Point = _swrast_validate_point;
 458
 459    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 460       swrast->BlendFunc = _swrast_validate_blend_func;
 461
 462    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 463       for (i = 0 ; i < ARRAY_SIZE(swrast->TextureSample); i++)
 464          swrast->TextureSample[i] = NULL;
 465 }
 466
 467
 468 void
 469 _swrast_update_texture_samplers(struct gl_context *ctx)
 470 {
 471    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 472    GLuint u;
 473
 474    if (!swrast)
 475       return; /* pipe hack */
 476
 477    for (u = 0; u < ARRAY_SIZE(swrast->TextureSample); u++) {
 478       struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 479       /* Note: If tObj is NULL, the sample function will be a simple
 480        * function that just returns opaque black (0,0,0,1).
 481        */
 482       _mesa_update_fetch_functions(ctx, u);
 483       swrast->TextureSample[u] =
 484          _swrast_choose_texture_sample_func(ctx, tObj,
 485                                             _mesa_get_samplerobj(ctx, u));
 486    }
 487 }
 488
 489
 490 /**
 491  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 492  * swrast->_ActiveAtttribMask.
 493  */
 494 static void
 495 _swrast_update_active_attribs(struct gl_context *ctx)
 496 {
 497    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 498    GLbitfield64 attribsMask;
 499
 500    /*
 501     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 502     */
 503    if (_swrast_use_fragment_program(ctx)) {
 504       /* fragment program/shader */
 505       attribsMask = ctx->FragmentProgram._Current->info.inputs_read;
 506       attribsMask &= ~VARYING_BIT_POS; /* WPOS is always handled specially */
 507    }
 508    else if (_mesa_ati_fragment_shader_enabled(ctx)) {
 509       attribsMask = VARYING_BIT_COL0 | VARYING_BIT_COL1 |
 510                     VARYING_BIT_FOGC | VARYING_BITS_TEX_ANY;
 511    }
 512    else {
 513       /* fixed function */
 514       attribsMask = 0x0;
 515
 516 #if CHAN_TYPE == GL_FLOAT
 517       attribsMask |= VARYING_BIT_COL0;
 518 #endif
 519
 520       if (ctx->Fog.ColorSumEnabled ||
 521           (ctx->Light.Enabled &&
 522            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 523          attribsMask |= VARYING_BIT_COL1;
 524       }
 525
 526       if (swrast->_FogEnabled)
 527          attribsMask |= VARYING_BIT_FOGC;
 528
 529       attribsMask |= (ctx->Texture._EnabledCoordUnits << VARYING_SLOT_TEX0);
 530    }
 531
 532    swrast->_ActiveAttribMask = attribsMask;
 533
 534    /* Update _ActiveAttribs[] list */
 535    {
 536       GLuint i, num = 0;
 537       for (i = 0; i < VARYING_SLOT_MAX; i++) {
 538          if (attribsMask & BITFIELD64_BIT(i)) {
 539             swrast->_ActiveAttribs[num++] = i;
 540             /* how should this attribute be interpolated? */
 541             if (i == VARYING_SLOT_COL0 || i == VARYING_SLOT_COL1)
 542                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 543             else
 544                swrast->_InterpMode[i] = GL_SMOOTH;
 545          }
 546       }
 547       swrast->_NumActiveAttribs = num;
 548    }
 549 }
 550
 551
 552 void
 553 _swrast_validate_derived( struct gl_context *ctx )
 554 {
 555    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 556
 557    if (swrast->NewState) {
 558       if (swrast->NewState & _NEW_POLYGON)
 559          _swrast_update_polygon( ctx );
 560
 561       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 562          _swrast_update_fog_hint( ctx );
 563
 564       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 565          _swrast_update_texture_env( ctx );
 566
 567       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 568          _swrast_update_fog_state( ctx );
 569
 570       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 571          _swrast_update_fragment_program( ctx, swrast->NewState );
 572
 573       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 574          _swrast_update_texture_samplers( ctx );
 575       }
 576
 577       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 578          _swrast_update_deferred_texture(ctx);
 579
 580       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 581          _swrast_update_rasterflags( ctx );
 582
 583       if (swrast->NewState & (_NEW_DEPTH |
 584                               _NEW_FOG |
 585                               _NEW_LIGHT |
 586                               _NEW_PROGRAM |
 587                               _NEW_TEXTURE))
 588          _swrast_update_active_attribs(ctx);
 589
 590       if (swrast->NewState & (_NEW_FOG |
 591                               _NEW_PROGRAM |
 592                               _NEW_LIGHT |
 593                               _NEW_TEXTURE))
 594          _swrast_update_specular_vertex_add(ctx);
 595
 596       swrast->NewState = 0;
 597       swrast->StateChanges = 0;
 598       swrast->InvalidateState = _swrast_invalidate_state;
 599    }
 600 }
 601
 602 #define SWRAST_DEBUG 0
 603
 604 /* Public entrypoints:  See also s_bitmap.c, etc.
 605  */
 606 void
 607 _swrast_Quad( struct gl_context *ctx,
 608               const SWvertex *v0, const SWvertex *v1,
 609               const SWvertex *v2, const SWvertex *v3 )
 610 {
 611    if (SWRAST_DEBUG) {
 612       _mesa_debug(ctx, "_swrast_Quad\n");
 613       _swrast_print_vertex( ctx, v0 );
 614       _swrast_print_vertex( ctx, v1 );
 615       _swrast_print_vertex( ctx, v2 );
 616       _swrast_print_vertex( ctx, v3 );
 617    }
 618    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 619    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 620 }
 621
 622 void
 623 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 624                   const SWvertex *v1, const SWvertex *v2 )
 625 {
 626    if (SWRAST_DEBUG) {
 627       _mesa_debug(ctx, "_swrast_Triangle\n");
 628       _swrast_print_vertex( ctx, v0 );
 629       _swrast_print_vertex( ctx, v1 );
 630       _swrast_print_vertex( ctx, v2 );
 631    }
 632    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 633 }
 634
 635 void
 636 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 637 {
 638    if (SWRAST_DEBUG) {
 639       _mesa_debug(ctx, "_swrast_Line\n");
 640       _swrast_print_vertex( ctx, v0 );
 641       _swrast_print_vertex( ctx, v1 );
 642    }
 643    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 644 }
 645
 646 void
 647 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 648 {
 649    if (SWRAST_DEBUG) {
 650       _mesa_debug(ctx, "_swrast_Point\n");
 651       _swrast_print_vertex( ctx, v0 );
 652    }
 653    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 654 }
 655
 656 void
 657 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 658 {
 659    if (SWRAST_DEBUG) {
 660       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 661    }
 662    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 663 }
 664
 665 void
 666 _swrast_ResetLineStipple( struct gl_context *ctx )
 667 {
 668    if (SWRAST_DEBUG) {
 669       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 670    }
 671    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 672 }
 673
 674 void
 675 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 676 {
 677    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 678 }
 679
 680 void
 681 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 682 {
 683    if (SWRAST_DEBUG) {
 684       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 685    }
 686    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 687    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 688 }
 689
 690 void
 691 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 692 {
 693    if (SWRAST_DEBUG) {
 694       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 695    }
 696    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 697    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 698 }
 699
 700
 701 /**
 702  * Initialize native program limits by copying the logical limits.
 703  * See comments in init_program_limits() in context.c
 704  */
 705 static void
 706 init_program_native_limits(struct gl_program_constants *prog)
 707 {
 708    prog->MaxNativeInstructions = prog->MaxInstructions;
 709    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 710    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 711    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 712    prog->MaxNativeAttribs = prog->MaxAttribs;
 713    prog->MaxNativeTemps = prog->MaxTemps;
 714    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 715    prog->MaxNativeParameters = prog->MaxParameters;
 716 }
 717
 718
 719 GLboolean
 720 _swrast_CreateContext( struct gl_context *ctx )
 721 {
 722    GLuint i;
 723    SWcontext *swrast = calloc(1, sizeof(SWcontext));
 724 #ifdef _OPENMP
 725    const GLuint maxThreads = omp_get_max_threads();
 726 #else
 727    const GLuint maxThreads = 1;
 728 #endif
 729
 730    assert(ctx->Const.MaxViewportWidth <= SWRAST_MAX_WIDTH);
 731    assert(ctx->Const.MaxViewportHeight <= SWRAST_MAX_WIDTH);
 732
 733    assert(ctx->Const.MaxRenderbufferSize <= SWRAST_MAX_WIDTH);
 734
 735    /* make sure largest texture image is <= SWRAST_MAX_WIDTH in size */
 736    assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 737    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 738    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 739
 740    assert(PROG_MAX_WIDTH == SWRAST_MAX_WIDTH);
 741
 742    if (SWRAST_DEBUG) {
 743       _mesa_debug(ctx, "_swrast_CreateContext\n");
 744    }
 745
 746    if (!swrast)
 747       return GL_FALSE;
 748
 749    swrast->NewState = ~0;
 750
 751    swrast->choose_point = _swrast_choose_point;
 752    swrast->choose_line = _swrast_choose_line;
 753    swrast->choose_triangle = _swrast_choose_triangle;
 754
 755    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 756    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 757    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 758
 759    swrast->Point = _swrast_validate_point;
 760    swrast->Line = _swrast_validate_line;
 761    swrast->Triangle = _swrast_validate_triangle;
 762    swrast->InvalidateState = _swrast_sleep;
 763    swrast->BlendFunc = _swrast_validate_blend_func;
 764
 765    swrast->AllowVertexFog = GL_TRUE;
 766    swrast->AllowPixelFog = GL_TRUE;
 767
 768    swrast->Driver.SpanRenderStart = _swrast_span_render_start;
 769    swrast->Driver.SpanRenderFinish = _swrast_span_render_finish;
 770
 771    for (i = 0; i < ARRAY_SIZE(swrast->TextureSample); i++)
 772       swrast->TextureSample[i] = NULL;
 773
 774    /* SpanArrays is global and shared by all SWspan instances. However, when
 775     * using multiple threads, it is necessary to have one SpanArrays instance
 776     * per thread.
 777     */
 778    swrast->SpanArrays = malloc(maxThreads * sizeof(SWspanarrays));
 779    if (!swrast->SpanArrays) {
 780       free(swrast);
 781       return GL_FALSE;
 782    }
 783    for(i = 0; i < maxThreads; i++) {
 784       swrast->SpanArrays[i].ChanType = CHAN_TYPE;
 785 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 786       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba8;
 787 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 788       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba16;
 789 #else
 790       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].attribs[VARYING_SLOT_COL0];
 791 #endif
 792    }
 793
 794    /* init point span buffer */
 795    swrast->PointSpan.primitive = GL_POINT;
 796    swrast->PointSpan.end = 0;
 797    swrast->PointSpan.facing = 0;
 798    swrast->PointSpan.array = swrast->SpanArrays;
 799
 800    init_program_native_limits(&ctx->Const.Program[MESA_SHADER_VERTEX]);
 801    init_program_native_limits(&ctx->Const.Program[MESA_SHADER_GEOMETRY]);
 802    init_program_native_limits(&ctx->Const.Program[MESA_SHADER_FRAGMENT]);
 803
 804    ctx->swrast_context = swrast;
 805
 806    swrast->stencil_temp.buf1 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 807    swrast->stencil_temp.buf2 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 808    swrast->stencil_temp.buf3 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 809    swrast->stencil_temp.buf4 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 810
 811    if (!swrast->stencil_temp.buf1 ||
 812        !swrast->stencil_temp.buf2 ||
 813        !swrast->stencil_temp.buf3 ||
 814        !swrast->stencil_temp.buf4) {
 815       _swrast_DestroyContext(ctx);
 816       return GL_FALSE;
 817    }
 818
 819    return GL_TRUE;
 820 }
 821
 822 void
 823 _swrast_DestroyContext( struct gl_context *ctx )
 824 {
 825    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 826
 827    if (SWRAST_DEBUG) {
 828       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 829    }
 830
 831    free( swrast->SpanArrays );
 832    free( swrast->ZoomedArrays );
 833    free( swrast->TexelBuffer );
 834
 835    free(swrast->stencil_temp.buf1);
 836    free(swrast->stencil_temp.buf2);
 837    free(swrast->stencil_temp.buf3);
 838    free(swrast->stencil_temp.buf4);
 839
 840    free( swrast );
 841
 842    ctx->swrast_context = 0;
 843 }
 844
 845
 846 struct swrast_device_driver *
 847 _swrast_GetDeviceDriverReference( struct gl_context *ctx )
 848 {
 849    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 850    return &swrast->Driver;
 851 }
 852
 853 void
 854 _swrast_flush( struct gl_context *ctx )
 855 {
 856    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 857    /* flush any pending fragments from rendering points */
 858    if (swrast->PointSpan.end > 0) {
 859       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 860       swrast->PointSpan.end = 0;
 861    }
 862 }
 863
 864 void
 865 _swrast_render_primitive( struct gl_context *ctx, GLenum prim )
 866 {
 867    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 868    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 869       _swrast_flush(ctx);
 870    }
 871    swrast->Primitive = prim;
 872 }
 873
 874
 875 /** called via swrast->Driver.SpanRenderStart() */
 876 void
 877 _swrast_span_render_start(struct gl_context *ctx)
 878 {
 879    _swrast_map_textures(ctx);
 880    _swrast_map_renderbuffers(ctx);
 881 }
 882
 883
 884 /** called via swrast->Driver.SpanRenderFinish() */
 885 void
 886 _swrast_span_render_finish(struct gl_context *ctx)
 887 {
 888    _swrast_unmap_textures(ctx);
 889    _swrast_unmap_renderbuffers(ctx);
 890 }
 891
 892
 893 void
 894 _swrast_render_start( struct gl_context *ctx )
 895 {
 896    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 897    if (swrast->Driver.SpanRenderStart)
 898       swrast->Driver.SpanRenderStart( ctx );
 899    swrast->PointSpan.end = 0;
 900 }
 901
 902 void
 903 _swrast_render_finish( struct gl_context *ctx )
 904 {
 905    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 906    struct gl_query_object *query = ctx->Query.CurrentOcclusionObject;
 907
 908    _swrast_flush(ctx);
 909
 910    if (swrast->Driver.SpanRenderFinish)
 911       swrast->Driver.SpanRenderFinish( ctx );
 912
 913    if (query && (query->Target == GL_ANY_SAMPLES_PASSED ||
 914                  query->Target == GL_ANY_SAMPLES_PASSED_CONSERVATIVE))
 915       query->Result = !!query->Result;
 916 }
 917
 918
 919 #define SWRAST_DEBUG_VERTICES 0
 920
 921 void
 922 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 923 {
 924    GLuint i;
 925
 926    if (SWRAST_DEBUG_VERTICES) {
 927       _mesa_debug(ctx, "win %f %f %f %f\n",
 928                   v->attrib[VARYING_SLOT_POS][0],
 929                   v->attrib[VARYING_SLOT_POS][1],
 930                   v->attrib[VARYING_SLOT_POS][2],
 931                   v->attrib[VARYING_SLOT_POS][3]);
 932
 933       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 934          if (ctx->Texture.Unit[i]._Current)
 935             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 936                         v->attrib[VARYING_SLOT_TEX0 + i][0],
 937                         v->attrib[VARYING_SLOT_TEX0 + i][1],
 938                         v->attrib[VARYING_SLOT_TEX0 + i][2],
 939                         v->attrib[VARYING_SLOT_TEX0 + i][3]);
 940
 941 #if CHAN_TYPE == GL_FLOAT
 942       _mesa_debug(ctx, "color %f %f %f %f\n",
 943                   v->color[0], v->color[1], v->color[2], v->color[3]);
 944 #else
 945       _mesa_debug(ctx, "color %d %d %d %d\n",
 946                   v->color[0], v->color[1], v->color[2], v->color[3]);
 947 #endif
 948       _mesa_debug(ctx, "spec %g %g %g %g\n",
 949                   v->attrib[VARYING_SLOT_COL1][0],
 950                   v->attrib[VARYING_SLOT_COL1][1],
 951                   v->attrib[VARYING_SLOT_COL1][2],
 952                   v->attrib[VARYING_SLOT_COL1][3]);
 953       _mesa_debug(ctx, "fog %f\n", v->attrib[VARYING_SLOT_FOGC][0]);
 954       _mesa_debug(ctx, "index %f\n", v->attrib[VARYING_SLOT_CI][0]);
 955       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 956       _mesa_debug(ctx, "\n");
 957    }
 958 }