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 (ctx->FragmentProgram._Current) {
 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                               ctx->FragmentProgram._Current ||
 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       const struct gl_fragment_program *fprog
 224          = ctx->FragmentProgram._Current;
 225       if (fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
 226          /* Z comes from fragment program/shader */
 227          swrast->_DeferredTexture = GL_FALSE;
 228       }
 229       else if (fprog && fprog->UsesKill) {
 230          swrast->_DeferredTexture = GL_FALSE;
 231       }
 232       else if (ctx->Query.CurrentOcclusionObject) {
 233          /* occlusion query depends on shader discard/kill results */
 234          swrast->_DeferredTexture = GL_FALSE;
 235       }
 236       else {
 237          swrast->_DeferredTexture = GL_TRUE;
 238       }
 239    }
 240 }
 241
 242
 243 /**
 244  * Update swrast->_FogColor and swrast->_FogEnable values.
 245  */
 246 static void
 247 _swrast_update_fog_state( struct gl_context *ctx )
 248 {
 249    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 250    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 251
 252    assert((fp == NULL) ||
 253           (fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) ||
 254           (fp->Base.Target == GL_FRAGMENT_PROGRAM_NV));
 255
 256    /* determine if fog is needed, and if so, which fog mode */
 257    swrast->_FogEnabled = (fp == NULL && ctx->Fog.Enabled);
 258 }
 259
 260
 261 /**
 262  * Update state for running fragment programs.  Basically, load the
 263  * program parameters with current state values.
 264  */
 265 static void
 266 _swrast_update_fragment_program(struct gl_context *ctx, GLbitfield newState)
 267 {
 268    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 269    if (fp) {
 270       _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 271    }
 272 }
 273
 274
 275 /**
 276  * See if we can do early diffuse+specular (primary+secondary) color
 277  * add per vertex instead of per-fragment.
 278  */
 279 static void
 280 _swrast_update_specular_vertex_add(struct gl_context *ctx)
 281 {
 282    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 283    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 284       (ctx->Light.Enabled &&
 285        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 286
 287    swrast->SpecularVertexAdd = (separateSpecular
 288                                 && ctx->Texture._EnabledUnits == 0x0
 289                                 && !ctx->FragmentProgram._Current
 290                                 && !ctx->ATIFragmentShader._Enabled);
 291 }
 292
 293
 294 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 295                              _NEW_PROGRAM_CONSTANTS |   \
 296                              _NEW_TEXTURE |             \
 297                              _NEW_HINT |                \
 298                              _NEW_POLYGON )
 299
 300 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 301  */
 302 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 303                               _NEW_RENDERMODE|                  \
 304                               _NEW_POLYGON|                     \
 305                               _NEW_DEPTH|                       \
 306                               _NEW_STENCIL|                     \
 307                               _NEW_COLOR|                       \
 308                               _NEW_TEXTURE|                     \
 309                               _SWRAST_NEW_RASTERMASK|           \
 310                               _NEW_LIGHT|                       \
 311                               _NEW_FOG |                        \
 312                               _DD_NEW_SEPARATE_SPECULAR)
 313
 314 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 315                           _NEW_RENDERMODE|              \
 316                           _NEW_LINE|                    \
 317                           _NEW_TEXTURE|                 \
 318                           _NEW_LIGHT|                   \
 319                           _NEW_FOG|                     \
 320                           _NEW_DEPTH |                  \
 321                           _DD_NEW_SEPARATE_SPECULAR)
 322
 323 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 324                            _NEW_RENDERMODE |            \
 325                            _NEW_POINT |                 \
 326                            _NEW_TEXTURE |               \
 327                            _NEW_LIGHT |                 \
 328                            _NEW_FOG |                   \
 329                            _DD_NEW_SEPARATE_SPECULAR)
 330
 331 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 332
 333 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 334
 335 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 336
 337
 338
 339 /**
 340  * Stub for swrast->Triangle to select a true triangle function
 341  * after a state change.
 342  */
 343 static void
 344 _swrast_validate_triangle( struct gl_context *ctx,
 345                            const SWvertex *v0,
 346                            const SWvertex *v1,
 347                            const SWvertex *v2 )
 348 {
 349    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 350
 351    _swrast_validate_derived( ctx );
 352    swrast->choose_triangle( ctx );
 353    ASSERT(swrast->Triangle);
 354
 355    if (swrast->SpecularVertexAdd) {
 356       /* separate specular color, but no texture */
 357       swrast->SpecTriangle = swrast->Triangle;
 358       swrast->Triangle = _swrast_add_spec_terms_triangle;
 359    }
 360
 361    swrast->Triangle( ctx, v0, v1, v2 );
 362 }
 363
 364 /**
 365  * Called via swrast->Line.  Examine current GL state and choose a software
 366  * line routine.  Then call it.
 367  */
 368 static void
 369 _swrast_validate_line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 370 {
 371    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 372
 373    _swrast_validate_derived( ctx );
 374    swrast->choose_line( ctx );
 375    ASSERT(swrast->Line);
 376
 377    if (swrast->SpecularVertexAdd) {
 378       swrast->SpecLine = swrast->Line;
 379       swrast->Line = _swrast_add_spec_terms_line;
 380    }
 381
 382    swrast->Line( ctx, v0, v1 );
 383 }
 384
 385 /**
 386  * Called via swrast->Point.  Examine current GL state and choose a software
 387  * point routine.  Then call it.
 388  */
 389 static void
 390 _swrast_validate_point( struct gl_context *ctx, const SWvertex *v0 )
 391 {
 392    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 393
 394    _swrast_validate_derived( ctx );
 395    swrast->choose_point( ctx );
 396
 397    if (swrast->SpecularVertexAdd) {
 398       swrast->SpecPoint = swrast->Point;
 399       swrast->Point = _swrast_add_spec_terms_point;
 400    }
 401
 402    swrast->Point( ctx, v0 );
 403 }
 404
 405
 406 /**
 407  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 408  * function, then call it.
 409  */
 410 static void _ASMAPI
 411 _swrast_validate_blend_func(struct gl_context *ctx, GLuint n, const GLubyte mask[],
 412                             GLvoid *src, const GLvoid *dst,
 413                             GLenum chanType )
 414 {
 415    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 416
 417    _swrast_validate_derived( ctx ); /* why is this needed? */
 418    _swrast_choose_blend_func( ctx, chanType );
 419
 420    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 421 }
 422
 423 static void
 424 _swrast_sleep( struct gl_context *ctx, GLbitfield new_state )
 425 {
 426    (void) ctx; (void) new_state;
 427 }
 428
 429
 430 static void
 431 _swrast_invalidate_state( struct gl_context *ctx, GLbitfield new_state )
 432 {
 433    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 434    GLuint i;
 435
 436    swrast->NewState |= new_state;
 437
 438    /* After 10 statechanges without any swrast functions being called,
 439     * put the module to sleep.
 440     */
 441    if (++swrast->StateChanges > 10) {
 442       swrast->InvalidateState = _swrast_sleep;
 443       swrast->NewState = ~0;
 444       new_state = ~0;
 445    }
 446
 447    if (new_state & swrast->InvalidateTriangleMask)
 448       swrast->Triangle = _swrast_validate_triangle;
 449
 450    if (new_state & swrast->InvalidateLineMask)
 451       swrast->Line = _swrast_validate_line;
 452
 453    if (new_state & swrast->InvalidatePointMask)
 454       swrast->Point = _swrast_validate_point;
 455
 456    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 457       swrast->BlendFunc = _swrast_validate_blend_func;
 458
 459    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 460       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 461          swrast->TextureSample[i] = NULL;
 462 }
 463
 464
 465 void
 466 _swrast_update_texture_samplers(struct gl_context *ctx)
 467 {
 468    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 469    GLuint u;
 470
 471    if (!swrast)
 472       return; /* pipe hack */
 473
 474    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 475       struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 476       /* Note: If tObj is NULL, the sample function will be a simple
 477        * function that just returns opaque black (0,0,0,1).
 478        */
 479       if (tObj) {
 480          _mesa_update_fetch_functions(tObj);
 481       }
 482       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 483    }
 484 }
 485
 486
 487 /**
 488  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 489  * swrast->_ActiveAtttribMask.
 490  */
 491 static void
 492 _swrast_update_active_attribs(struct gl_context *ctx)
 493 {
 494    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 495    GLbitfield64 attribsMask;
 496
 497    /*
 498     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 499     */
 500    if (ctx->FragmentProgram._Current) {
 501       /* fragment program/shader */
 502       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 503       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 504    }
 505    else if (ctx->ATIFragmentShader._Enabled) {
 506       attribsMask = ~0;  /* XXX fix me */
 507    }
 508    else {
 509       /* fixed function */
 510       attribsMask = 0x0;
 511
 512 #if CHAN_TYPE == GL_FLOAT
 513       attribsMask |= FRAG_BIT_COL0;
 514 #endif
 515
 516       if (ctx->Fog.ColorSumEnabled ||
 517           (ctx->Light.Enabled &&
 518            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 519          attribsMask |= FRAG_BIT_COL1;
 520       }
 521
 522       if (swrast->_FogEnabled)
 523          attribsMask |= FRAG_BIT_FOGC;
 524
 525       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 526    }
 527
 528    swrast->_ActiveAttribMask = attribsMask;
 529
 530    /* Update _ActiveAttribs[] list */
 531    {
 532       GLuint i, num = 0;
 533       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 534          if (attribsMask & BITFIELD64_BIT(i)) {
 535             swrast->_ActiveAttribs[num++] = i;
 536             /* how should this attribute be interpolated? */
 537             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 538                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 539             else
 540                swrast->_InterpMode[i] = GL_SMOOTH;
 541          }
 542       }
 543       swrast->_NumActiveAttribs = num;
 544    }
 545 }
 546
 547
 548 void
 549 _swrast_validate_derived( struct gl_context *ctx )
 550 {
 551    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 552
 553    if (swrast->NewState) {
 554       if (swrast->NewState & _NEW_POLYGON)
 555          _swrast_update_polygon( ctx );
 556
 557       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 558          _swrast_update_fog_hint( ctx );
 559
 560       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 561          _swrast_update_texture_env( ctx );
 562
 563       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 564          _swrast_update_fog_state( ctx );
 565
 566       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 567          _swrast_update_fragment_program( ctx, swrast->NewState );
 568
 569       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 570          _swrast_update_texture_samplers( ctx );
 571       }
 572
 573       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 574          _swrast_update_deferred_texture(ctx);
 575
 576       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 577          _swrast_update_rasterflags( ctx );
 578
 579       if (swrast->NewState & (_NEW_DEPTH |
 580                               _NEW_FOG |
 581                               _NEW_LIGHT |
 582                               _NEW_PROGRAM |
 583                               _NEW_TEXTURE))
 584          _swrast_update_active_attribs(ctx);
 585
 586       if (swrast->NewState & (_NEW_FOG |
 587                               _NEW_PROGRAM |
 588                               _NEW_LIGHT |
 589                               _NEW_TEXTURE))
 590          _swrast_update_specular_vertex_add(ctx);
 591
 592       swrast->NewState = 0;
 593       swrast->StateChanges = 0;
 594       swrast->InvalidateState = _swrast_invalidate_state;
 595    }
 596 }
 597
 598 #define SWRAST_DEBUG 0
 599
 600 /* Public entrypoints:  See also s_bitmap.c, etc.
 601  */
 602 void
 603 _swrast_Quad( struct gl_context *ctx,
 604               const SWvertex *v0, const SWvertex *v1,
 605               const SWvertex *v2, const SWvertex *v3 )
 606 {
 607    if (SWRAST_DEBUG) {
 608       _mesa_debug(ctx, "_swrast_Quad\n");
 609       _swrast_print_vertex( ctx, v0 );
 610       _swrast_print_vertex( ctx, v1 );
 611       _swrast_print_vertex( ctx, v2 );
 612       _swrast_print_vertex( ctx, v3 );
 613    }
 614    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 615    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 616 }
 617
 618 void
 619 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 620                   const SWvertex *v1, const SWvertex *v2 )
 621 {
 622    if (SWRAST_DEBUG) {
 623       _mesa_debug(ctx, "_swrast_Triangle\n");
 624       _swrast_print_vertex( ctx, v0 );
 625       _swrast_print_vertex( ctx, v1 );
 626       _swrast_print_vertex( ctx, v2 );
 627    }
 628    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 629 }
 630
 631 void
 632 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 633 {
 634    if (SWRAST_DEBUG) {
 635       _mesa_debug(ctx, "_swrast_Line\n");
 636       _swrast_print_vertex( ctx, v0 );
 637       _swrast_print_vertex( ctx, v1 );
 638    }
 639    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 640 }
 641
 642 void
 643 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 644 {
 645    if (SWRAST_DEBUG) {
 646       _mesa_debug(ctx, "_swrast_Point\n");
 647       _swrast_print_vertex( ctx, v0 );
 648    }
 649    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 650 }
 651
 652 void
 653 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 654 {
 655    if (SWRAST_DEBUG) {
 656       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 657    }
 658    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 659 }
 660
 661 void
 662 _swrast_ResetLineStipple( struct gl_context *ctx )
 663 {
 664    if (SWRAST_DEBUG) {
 665       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 666    }
 667    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 668 }
 669
 670 void
 671 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 672 {
 673    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 674 }
 675
 676 void
 677 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 678 {
 679    if (SWRAST_DEBUG) {
 680       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 681    }
 682    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 683    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 684 }
 685
 686 void
 687 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 688 {
 689    if (SWRAST_DEBUG) {
 690       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 691    }
 692    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 693    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 694 }
 695
 696
 697 /**
 698  * Initialize native program limits by copying the logical limits.
 699  * See comments in init_program_limits() in context.c
 700  */
 701 static void
 702 init_program_native_limits(struct gl_program_constants *prog)
 703 {
 704    prog->MaxNativeInstructions = prog->MaxInstructions;
 705    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 706    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 707    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 708    prog->MaxNativeAttribs = prog->MaxAttribs;
 709    prog->MaxNativeTemps = prog->MaxTemps;
 710    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 711    prog->MaxNativeParameters = prog->MaxParameters;
 712 }
 713
 714
 715 GLboolean
 716 _swrast_CreateContext( struct gl_context *ctx )
 717 {
 718    GLuint i;
 719    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 720 #ifdef _OPENMP
 721    const GLuint maxThreads = omp_get_max_threads();
 722 #else
 723    const GLuint maxThreads = 1;
 724 #endif
 725
 726    if (SWRAST_DEBUG) {
 727       _mesa_debug(ctx, "_swrast_CreateContext\n");
 728    }
 729
 730    if (!swrast)
 731       return GL_FALSE;
 732
 733    swrast->NewState = ~0;
 734
 735    swrast->choose_point = _swrast_choose_point;
 736    swrast->choose_line = _swrast_choose_line;
 737    swrast->choose_triangle = _swrast_choose_triangle;
 738
 739    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 740    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 741    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 742
 743    swrast->Point = _swrast_validate_point;
 744    swrast->Line = _swrast_validate_line;
 745    swrast->Triangle = _swrast_validate_triangle;
 746    swrast->InvalidateState = _swrast_sleep;
 747    swrast->BlendFunc = _swrast_validate_blend_func;
 748
 749    swrast->AllowVertexFog = GL_TRUE;
 750    swrast->AllowPixelFog = GL_TRUE;
 751
 752    swrast->Driver.SpanRenderStart = _swrast_span_render_start;
 753    swrast->Driver.SpanRenderFinish = _swrast_span_render_finish;
 754
 755    ctx->Driver.MapTexture = _swrast_map_texture;
 756    ctx->Driver.UnmapTexture = _swrast_unmap_texture;
 757
 758    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 759       swrast->TextureSample[i] = NULL;
 760
 761    /* SpanArrays is global and shared by all SWspan instances. However, when
 762     * using multiple threads, it is necessary to have one SpanArrays instance
 763     * per thread.
 764     */
 765    swrast->SpanArrays = (SWspanarrays *) MALLOC(maxThreads * sizeof(SWspanarrays));
 766    if (!swrast->SpanArrays) {
 767       FREE(swrast);
 768       return GL_FALSE;
 769    }
 770    for(i = 0; i < maxThreads; i++) {
 771       swrast->SpanArrays[i].ChanType = CHAN_TYPE;
 772 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 773       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba8;
 774 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 775       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba16;
 776 #else
 777       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].attribs[FRAG_ATTRIB_COL0];
 778 #endif
 779    }
 780
 781    /* init point span buffer */
 782    swrast->PointSpan.primitive = GL_POINT;
 783    swrast->PointSpan.end = 0;
 784    swrast->PointSpan.facing = 0;
 785    swrast->PointSpan.array = swrast->SpanArrays;
 786
 787    init_program_native_limits(&ctx->Const.VertexProgram);
 788    init_program_native_limits(&ctx->Const.GeometryProgram);
 789    init_program_native_limits(&ctx->Const.FragmentProgram);
 790
 791    ctx->swrast_context = swrast;
 792
 793    return GL_TRUE;
 794 }
 795
 796 void
 797 _swrast_DestroyContext( struct gl_context *ctx )
 798 {
 799    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 800
 801    if (SWRAST_DEBUG) {
 802       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 803    }
 804
 805    FREE( swrast->SpanArrays );
 806    if (swrast->ZoomedArrays)
 807       FREE( swrast->ZoomedArrays );
 808    FREE( swrast->TexelBuffer );
 809    FREE( swrast );
 810
 811    ctx->swrast_context = 0;
 812 }
 813
 814
 815 struct swrast_device_driver *
 816 _swrast_GetDeviceDriverReference( struct gl_context *ctx )
 817 {
 818    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 819    return &swrast->Driver;
 820 }
 821
 822 void
 823 _swrast_flush( struct gl_context *ctx )
 824 {
 825    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 826    /* flush any pending fragments from rendering points */
 827    if (swrast->PointSpan.end > 0) {
 828       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 829       swrast->PointSpan.end = 0;
 830    }
 831 }
 832
 833 void
 834 _swrast_render_primitive( struct gl_context *ctx, GLenum prim )
 835 {
 836    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 837    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 838       _swrast_flush(ctx);
 839    }
 840    swrast->Primitive = prim;
 841 }
 842
 843
 844 /** called via swrast->Driver.SpanRenderStart() */
 845 void
 846 _swrast_span_render_start(struct gl_context *ctx)
 847 {
 848    _swrast_map_textures(ctx);
 849    _swrast_map_renderbuffers(ctx);
 850 }
 851
 852
 853 /** called via swrast->Driver.SpanRenderFinish() */
 854 void
 855 _swrast_span_render_finish(struct gl_context *ctx)
 856 {
 857    _swrast_unmap_textures(ctx);
 858    _swrast_unmap_renderbuffers(ctx);
 859 }
 860
 861
 862 void
 863 _swrast_render_start( struct gl_context *ctx )
 864 {
 865    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 866    if (swrast->Driver.SpanRenderStart)
 867       swrast->Driver.SpanRenderStart( ctx );
 868    swrast->PointSpan.end = 0;
 869 }
 870
 871 void
 872 _swrast_render_finish( struct gl_context *ctx )
 873 {
 874    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 875
 876    _swrast_flush(ctx);
 877
 878    if (swrast->Driver.SpanRenderFinish)
 879       swrast->Driver.SpanRenderFinish( ctx );
 880 }
 881
 882
 883 #define SWRAST_DEBUG_VERTICES 0
 884
 885 void
 886 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 887 {
 888    GLuint i;
 889
 890    if (SWRAST_DEBUG_VERTICES) {
 891       _mesa_debug(ctx, "win %f %f %f %f\n",
 892                   v->attrib[FRAG_ATTRIB_WPOS][0],
 893                   v->attrib[FRAG_ATTRIB_WPOS][1],
 894                   v->attrib[FRAG_ATTRIB_WPOS][2],
 895                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 896
 897       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 898          if (ctx->Texture.Unit[i]._ReallyEnabled)
 899             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 900                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 901                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 902                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 903                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 904
 905 #if CHAN_TYPE == GL_FLOAT
 906       _mesa_debug(ctx, "color %f %f %f %f\n",
 907                   v->color[0], v->color[1], v->color[2], v->color[3]);
 908 #else
 909       _mesa_debug(ctx, "color %d %d %d %d\n",
 910                   v->color[0], v->color[1], v->color[2], v->color[3]);
 911 #endif
 912       _mesa_debug(ctx, "spec %g %g %g %g\n",
 913                   v->attrib[FRAG_ATTRIB_COL1][0],
 914                   v->attrib[FRAG_ATTRIB_COL1][1],
 915                   v->attrib[FRAG_ATTRIB_COL1][2],
 916                   v->attrib[FRAG_ATTRIB_COL1][3]);
 917       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 918       _mesa_debug(ctx, "index %f\n", v->attrib[FRAG_ATTRIB_CI][0]);
 919       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 920       _mesa_debug(ctx, "\n");
 921    }
 922 }