src/mesa/swrast/s_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   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  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  *    Brian Paul
  27  */
  28
  29 #include "main/imports.h"
  30 #include "main/bufferobj.h"
  31 #include "main/colormac.h"
  32 #include "main/mtypes.h"
  33 #include "main/teximage.h"
  34 #include "program/prog_parameter.h"
  35 #include "program/prog_statevars.h"
  36 #include "swrast.h"
  37 #include "s_blend.h"
  38 #include "s_context.h"
  39 #include "s_lines.h"
  40 #include "s_points.h"
  41 #include "s_span.h"
  42 #include "s_texfetch.h"
  43 #include "s_triangle.h"
  44 #include "s_texfilter.h"
  45
  46
  47 /**
  48  * Recompute the value of swrast->_RasterMask, etc. according to
  49  * the current context.  The _RasterMask field can be easily tested by
  50  * drivers to determine certain basic GL state (does the primitive need
  51  * stenciling, logic-op, fog, etc?).
  52  */
  53 static void
  54 _swrast_update_rasterflags( struct gl_context *ctx )
  55 {
  56    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  57    GLbitfield rasterMask = 0;
  58    GLuint i;
  59
  60    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  61    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  62    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  63    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  64    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  65    if (ctx->Stencil._Enabled)             rasterMask |= STENCIL_BIT;
  66    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  67       if (!ctx->Color.ColorMask[i][0] ||
  68           !ctx->Color.ColorMask[i][1] ||
  69           !ctx->Color.ColorMask[i][2] ||
  70           !ctx->Color.ColorMask[i][3]) {
  71          rasterMask |= MASKING_BIT;
  72          break;
  73       }
  74    }
  75    if (ctx->Color.ColorLogicOpEnabled) rasterMask |= LOGIC_OP_BIT;
  76    if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  77    if (   ctx->Viewport.X < 0
  78        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  79        || ctx->Viewport.Y < 0
  80        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  81       rasterMask |= CLIP_BIT;
  82    }
  83
  84    if (ctx->Query.CurrentOcclusionObject)
  85       rasterMask |= OCCLUSION_BIT;
  86
  87
  88    /* If we're not drawing to exactly one color buffer set the
  89     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  90     * buffers or the RGBA or CI mask disables all writes.
  91     */
  92    if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
  93       /* more than one color buffer designated for writing (or zero buffers) */
  94       rasterMask |= MULTI_DRAW_BIT;
  95    }
  96
  97    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  98       if (ctx->Color.ColorMask[i][0] +
  99           ctx->Color.ColorMask[i][1] +
 100           ctx->Color.ColorMask[i][2] +
 101           ctx->Color.ColorMask[i][3] == 0) {
 102          rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 103          break;
 104       }
 105    }
 106
 107
 108    if (_swrast_use_fragment_program(ctx)) {
 109       rasterMask |= FRAGPROG_BIT;
 110    }
 111
 112    if (ctx->ATIFragmentShader._Enabled) {
 113       rasterMask |= ATIFRAGSHADER_BIT;
 114    }
 115
 116 #if CHAN_TYPE == GL_FLOAT
 117    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 118       rasterMask |= CLAMPING_BIT;
 119    }
 120 #endif
 121
 122    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 123 }
 124
 125
 126 /**
 127  * Examine polygon cull state to compute the _BackfaceCullSign field.
 128  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 129  * and 1 if culling front-faces.  The Polygon FrontFace state also
 130  * factors in.
 131  */
 132 static void
 133 _swrast_update_polygon( struct gl_context *ctx )
 134 {
 135    GLfloat backface_sign;
 136
 137    if (ctx->Polygon.CullFlag) {
 138       switch (ctx->Polygon.CullFaceMode) {
 139       case GL_BACK:
 140          backface_sign = -1.0F;
 141          break;
 142       case GL_FRONT:
 143          backface_sign = 1.0F;
 144          break;
 145       case GL_FRONT_AND_BACK:
 146          /* fallthrough */
 147       default:
 148          backface_sign = 0.0F;
 149       }
 150    }
 151    else {
 152       backface_sign = 0.0F;
 153    }
 154
 155    SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
 156
 157    /* This is for front/back-face determination, but not for culling */
 158    SWRAST_CONTEXT(ctx)->_BackfaceSign
 159       = (ctx->Polygon.FrontFace == GL_CW) ? -1.0F : 1.0F;
 160 }
 161
 162
 163
 164 /**
 165  * Update the _PreferPixelFog field to indicate if we need to compute
 166  * fog blend factors (from the fog coords) per-fragment.
 167  */
 168 static void
 169 _swrast_update_fog_hint( struct gl_context *ctx )
 170 {
 171    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 172    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 173                               _swrast_use_fragment_program(ctx) ||
 174                               (ctx->Hint.Fog == GL_NICEST &&
 175                                swrast->AllowPixelFog));
 176 }
 177
 178
 179
 180 /**
 181  * Update the swrast->_TextureCombinePrimary flag.
 182  */
 183 static void
 184 _swrast_update_texture_env( struct gl_context *ctx )
 185 {
 186    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 187    GLuint i;
 188
 189    swrast->_TextureCombinePrimary = GL_FALSE;
 190
 191    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 192       const struct gl_tex_env_combine_state *combine =
 193          ctx->Texture.Unit[i]._CurrentCombine;
 194       GLuint term;
 195       for (term = 0; term < combine->_NumArgsRGB; term++) {
 196          if (combine->SourceRGB[term] == GL_PRIMARY_COLOR) {
 197             swrast->_TextureCombinePrimary = GL_TRUE;
 198             return;
 199          }
 200          if (combine->SourceA[term] == GL_PRIMARY_COLOR) {
 201             swrast->_TextureCombinePrimary = GL_TRUE;
 202             return;
 203          }
 204       }
 205    }
 206 }
 207
 208
 209 /**
 210  * Determine if we can defer texturing/shading until after Z/stencil
 211  * testing.  This potentially allows us to skip texturing/shading for
 212  * lots of fragments.
 213  */
 214 static void
 215 _swrast_update_deferred_texture(struct gl_context *ctx)
 216 {
 217    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 218    if (ctx->Color.AlphaEnabled) {
 219       /* alpha test depends on post-texture/shader colors */
 220       swrast->_DeferredTexture = GL_FALSE;
 221    }
 222    else {
 223       GLboolean use_fprog = _swrast_use_fragment_program(ctx);
 224       const struct gl_fragment_program *fprog
 225          = ctx->FragmentProgram._Current;
 226       if (use_fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
 227          /* Z comes from fragment program/shader */
 228          swrast->_DeferredTexture = GL_FALSE;
 229       }
 230       else if (use_fprog && fprog->UsesKill) {
 231          swrast->_DeferredTexture = GL_FALSE;
 232       }
 233       else if (ctx->Query.CurrentOcclusionObject) {
 234          /* occlusion query depends on shader discard/kill results */
 235          swrast->_DeferredTexture = GL_FALSE;
 236       }
 237       else {
 238          swrast->_DeferredTexture = GL_TRUE;
 239       }
 240    }
 241 }
 242
 243
 244 /**
 245  * Update swrast->_FogColor and swrast->_FogEnable values.
 246  */
 247 static void
 248 _swrast_update_fog_state( struct gl_context *ctx )
 249 {
 250    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 251    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 252
 253    assert((fp == NULL) ||
 254           (fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) ||
 255           (fp->Base.Target == GL_FRAGMENT_PROGRAM_NV));
 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->Base.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._EnabledUnits == 0x0
 292                                 && !_swrast_use_fragment_program(ctx)
 293                                 && !ctx->ATIFragmentShader._Enabled);
 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 _ASMAPI
 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 < ctx->Const.MaxTextureImageUnits ; 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 < ctx->Const.MaxTextureImageUnits; 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       if (tObj) {
 483          _mesa_update_fetch_functions(tObj);
 484       }
 485       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 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->Base.InputsRead;
 506       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 507    }
 508    else if (ctx->ATIFragmentShader._Enabled) {
 509       attribsMask = ~0;  /* XXX fix me */
 510    }
 511    else {
 512       /* fixed function */
 513       attribsMask = 0x0;
 514
 515 #if CHAN_TYPE == GL_FLOAT
 516       attribsMask |= FRAG_BIT_COL0;
 517 #endif
 518
 519       if (ctx->Fog.ColorSumEnabled ||
 520           (ctx->Light.Enabled &&
 521            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 522          attribsMask |= FRAG_BIT_COL1;
 523       }
 524
 525       if (swrast->_FogEnabled)
 526          attribsMask |= FRAG_BIT_FOGC;
 527
 528       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 529    }
 530
 531    swrast->_ActiveAttribMask = attribsMask;
 532
 533    /* Update _ActiveAttribs[] list */
 534    {
 535       GLuint i, num = 0;
 536       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 537          if (attribsMask & BITFIELD64_BIT(i)) {
 538             swrast->_ActiveAttribs[num++] = i;
 539             /* how should this attribute be interpolated? */
 540             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 541                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 542             else
 543                swrast->_InterpMode[i] = GL_SMOOTH;
 544          }
 545       }
 546       swrast->_NumActiveAttribs = num;
 547    }
 548 }
 549
 550
 551 void
 552 _swrast_validate_derived( struct gl_context *ctx )
 553 {
 554    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 555
 556    if (swrast->NewState) {
 557       if (swrast->NewState & _NEW_POLYGON)
 558          _swrast_update_polygon( ctx );
 559
 560       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 561          _swrast_update_fog_hint( ctx );
 562
 563       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 564          _swrast_update_texture_env( ctx );
 565
 566       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 567          _swrast_update_fog_state( ctx );
 568
 569       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 570          _swrast_update_fragment_program( ctx, swrast->NewState );
 571
 572       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 573          _swrast_update_texture_samplers( ctx );
 574       }
 575
 576       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 577          _swrast_update_deferred_texture(ctx);
 578
 579       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 580          _swrast_update_rasterflags( ctx );
 581
 582       if (swrast->NewState & (_NEW_DEPTH |
 583                               _NEW_FOG |
 584                               _NEW_LIGHT |
 585                               _NEW_PROGRAM |
 586                               _NEW_TEXTURE))
 587          _swrast_update_active_attribs(ctx);
 588
 589       if (swrast->NewState & (_NEW_FOG |
 590                               _NEW_PROGRAM |
 591                               _NEW_LIGHT |
 592                               _NEW_TEXTURE))
 593          _swrast_update_specular_vertex_add(ctx);
 594
 595       swrast->NewState = 0;
 596       swrast->StateChanges = 0;
 597       swrast->InvalidateState = _swrast_invalidate_state;
 598    }
 599 }
 600
 601 #define SWRAST_DEBUG 0
 602
 603 /* Public entrypoints:  See also s_bitmap.c, etc.
 604  */
 605 void
 606 _swrast_Quad( struct gl_context *ctx,
 607               const SWvertex *v0, const SWvertex *v1,
 608               const SWvertex *v2, const SWvertex *v3 )
 609 {
 610    if (SWRAST_DEBUG) {
 611       _mesa_debug(ctx, "_swrast_Quad\n");
 612       _swrast_print_vertex( ctx, v0 );
 613       _swrast_print_vertex( ctx, v1 );
 614       _swrast_print_vertex( ctx, v2 );
 615       _swrast_print_vertex( ctx, v3 );
 616    }
 617    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 618    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 619 }
 620
 621 void
 622 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 623                   const SWvertex *v1, const SWvertex *v2 )
 624 {
 625    if (SWRAST_DEBUG) {
 626       _mesa_debug(ctx, "_swrast_Triangle\n");
 627       _swrast_print_vertex( ctx, v0 );
 628       _swrast_print_vertex( ctx, v1 );
 629       _swrast_print_vertex( ctx, v2 );
 630    }
 631    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 632 }
 633
 634 void
 635 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 636 {
 637    if (SWRAST_DEBUG) {
 638       _mesa_debug(ctx, "_swrast_Line\n");
 639       _swrast_print_vertex( ctx, v0 );
 640       _swrast_print_vertex( ctx, v1 );
 641    }
 642    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 643 }
 644
 645 void
 646 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 647 {
 648    if (SWRAST_DEBUG) {
 649       _mesa_debug(ctx, "_swrast_Point\n");
 650       _swrast_print_vertex( ctx, v0 );
 651    }
 652    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 653 }
 654
 655 void
 656 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 657 {
 658    if (SWRAST_DEBUG) {
 659       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 660    }
 661    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 662 }
 663
 664 void
 665 _swrast_ResetLineStipple( struct gl_context *ctx )
 666 {
 667    if (SWRAST_DEBUG) {
 668       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 669    }
 670    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 671 }
 672
 673 void
 674 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 675 {
 676    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 677 }
 678
 679 void
 680 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 681 {
 682    if (SWRAST_DEBUG) {
 683       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 684    }
 685    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 686    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 687 }
 688
 689 void
 690 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 691 {
 692    if (SWRAST_DEBUG) {
 693       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 694    }
 695    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 696    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 697 }
 698
 699
 700 /**
 701  * Initialize native program limits by copying the logical limits.
 702  * See comments in init_program_limits() in context.c
 703  */
 704 static void
 705 init_program_native_limits(struct gl_program_constants *prog)
 706 {
 707    prog->MaxNativeInstructions = prog->MaxInstructions;
 708    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 709    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 710    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 711    prog->MaxNativeAttribs = prog->MaxAttribs;
 712    prog->MaxNativeTemps = prog->MaxTemps;
 713    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 714    prog->MaxNativeParameters = prog->MaxParameters;
 715 }
 716
 717
 718 GLboolean
 719 _swrast_CreateContext( struct gl_context *ctx )
 720 {
 721    GLuint i;
 722    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 723 #ifdef _OPENMP
 724    const GLuint maxThreads = omp_get_max_threads();
 725 #else
 726    const GLuint maxThreads = 1;
 727 #endif
 728
 729    assert(ctx->Const.MaxViewportWidth <= SWRAST_MAX_WIDTH);
 730    assert(ctx->Const.MaxViewportHeight <= SWRAST_MAX_WIDTH);
 731
 732    assert(ctx->Const.MaxRenderbufferSize <= SWRAST_MAX_WIDTH);
 733
 734    /* make sure largest texture image is <= SWRAST_MAX_WIDTH in size */
 735    assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 736    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 737    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 738
 739    assert(PROG_MAX_WIDTH == SWRAST_MAX_WIDTH);
 740
 741    if (SWRAST_DEBUG) {
 742       _mesa_debug(ctx, "_swrast_CreateContext\n");
 743    }
 744
 745    if (!swrast)
 746       return GL_FALSE;
 747
 748    swrast->NewState = ~0;
 749
 750    swrast->choose_point = _swrast_choose_point;
 751    swrast->choose_line = _swrast_choose_line;
 752    swrast->choose_triangle = _swrast_choose_triangle;
 753
 754    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 755    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 756    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 757
 758    swrast->Point = _swrast_validate_point;
 759    swrast->Line = _swrast_validate_line;
 760    swrast->Triangle = _swrast_validate_triangle;
 761    swrast->InvalidateState = _swrast_sleep;
 762    swrast->BlendFunc = _swrast_validate_blend_func;
 763
 764    swrast->AllowVertexFog = GL_TRUE;
 765    swrast->AllowPixelFog = GL_TRUE;
 766
 767    swrast->Driver.SpanRenderStart = _swrast_span_render_start;
 768    swrast->Driver.SpanRenderFinish = _swrast_span_render_finish;
 769
 770    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 771       swrast->TextureSample[i] = NULL;
 772
 773    /* SpanArrays is global and shared by all SWspan instances. However, when
 774     * using multiple threads, it is necessary to have one SpanArrays instance
 775     * per thread.
 776     */
 777    swrast->SpanArrays = (SWspanarrays *) MALLOC(maxThreads * sizeof(SWspanarrays));
 778    if (!swrast->SpanArrays) {
 779       FREE(swrast);
 780       return GL_FALSE;
 781    }
 782    for(i = 0; i < maxThreads; i++) {
 783       swrast->SpanArrays[i].ChanType = CHAN_TYPE;
 784 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 785       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba8;
 786 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 787       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba16;
 788 #else
 789       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].attribs[FRAG_ATTRIB_COL0];
 790 #endif
 791    }
 792
 793    /* init point span buffer */
 794    swrast->PointSpan.primitive = GL_POINT;
 795    swrast->PointSpan.end = 0;
 796    swrast->PointSpan.facing = 0;
 797    swrast->PointSpan.array = swrast->SpanArrays;
 798
 799    init_program_native_limits(&ctx->Const.VertexProgram);
 800    init_program_native_limits(&ctx->Const.GeometryProgram);
 801    init_program_native_limits(&ctx->Const.FragmentProgram);
 802
 803    ctx->swrast_context = swrast;
 804
 805    swrast->stencil_temp.buf1 = (GLubyte *) malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 806    swrast->stencil_temp.buf2 = (GLubyte *) malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 807    swrast->stencil_temp.buf3 = (GLubyte *) malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 808    swrast->stencil_temp.buf4 = (GLubyte *) malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 809
 810    if (!swrast->stencil_temp.buf1 ||
 811        !swrast->stencil_temp.buf2 ||
 812        !swrast->stencil_temp.buf3 ||
 813        !swrast->stencil_temp.buf4) {
 814       _swrast_DestroyContext(ctx);
 815       return GL_FALSE;
 816    }
 817
 818    return GL_TRUE;
 819 }
 820
 821 void
 822 _swrast_DestroyContext( struct gl_context *ctx )
 823 {
 824    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 825
 826    if (SWRAST_DEBUG) {
 827       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 828    }
 829
 830    FREE( swrast->SpanArrays );
 831    if (swrast->ZoomedArrays)
 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
 907    _swrast_flush(ctx);
 908
 909    if (swrast->Driver.SpanRenderFinish)
 910       swrast->Driver.SpanRenderFinish( ctx );
 911 }
 912
 913
 914 #define SWRAST_DEBUG_VERTICES 0
 915
 916 void
 917 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 918 {
 919    GLuint i;
 920
 921    if (SWRAST_DEBUG_VERTICES) {
 922       _mesa_debug(ctx, "win %f %f %f %f\n",
 923                   v->attrib[FRAG_ATTRIB_WPOS][0],
 924                   v->attrib[FRAG_ATTRIB_WPOS][1],
 925                   v->attrib[FRAG_ATTRIB_WPOS][2],
 926                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 927
 928       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 929          if (ctx->Texture.Unit[i]._ReallyEnabled)
 930             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 931                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 932                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 933                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 934                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 935
 936 #if CHAN_TYPE == GL_FLOAT
 937       _mesa_debug(ctx, "color %f %f %f %f\n",
 938                   v->color[0], v->color[1], v->color[2], v->color[3]);
 939 #else
 940       _mesa_debug(ctx, "color %d %d %d %d\n",
 941                   v->color[0], v->color[1], v->color[2], v->color[3]);
 942 #endif
 943       _mesa_debug(ctx, "spec %g %g %g %g\n",
 944                   v->attrib[FRAG_ATTRIB_COL1][0],
 945                   v->attrib[FRAG_ATTRIB_COL1][1],
 946                   v->attrib[FRAG_ATTRIB_COL1][2],
 947                   v->attrib[FRAG_ATTRIB_COL1][3]);
 948       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 949       _mesa_debug(ctx, "index %f\n", v->attrib[FRAG_ATTRIB_CI][0]);
 950       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 951       _mesa_debug(ctx, "\n");
 952    }
 953 }