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 "main/texfetch.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_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._LogicOpEnabled)     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) || (fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB));
 253
 254    /* determine if fog is needed, and if so, which fog mode */
 255    swrast->_FogEnabled = (fp == NULL && ctx->Fog.Enabled);
 256 }
 257
 258
 259 /**
 260  * Update state for running fragment programs.  Basically, load the
 261  * program parameters with current state values.
 262  */
 263 static void
 264 _swrast_update_fragment_program(struct gl_context *ctx, GLbitfield newState)
 265 {
 266    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 267    if (fp) {
 268       _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 269    }
 270 }
 271
 272
 273 /**
 274  * See if we can do early diffuse+specular (primary+secondary) color
 275  * add per vertex instead of per-fragment.
 276  */
 277 static void
 278 _swrast_update_specular_vertex_add(struct gl_context *ctx)
 279 {
 280    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 281    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 282       (ctx->Light.Enabled &&
 283        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 284
 285    swrast->SpecularVertexAdd = (separateSpecular
 286                                 && ctx->Texture._EnabledUnits == 0x0
 287                                 && !ctx->FragmentProgram._Current
 288                                 && !ctx->ATIFragmentShader._Enabled);
 289 }
 290
 291
 292 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 293                              _NEW_PROGRAM_CONSTANTS |   \
 294                              _NEW_TEXTURE |             \
 295                              _NEW_HINT |                \
 296                              _NEW_POLYGON )
 297
 298 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 299  */
 300 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 301                               _NEW_RENDERMODE|                  \
 302                               _NEW_POLYGON|                     \
 303                               _NEW_DEPTH|                       \
 304                               _NEW_STENCIL|                     \
 305                               _NEW_COLOR|                       \
 306                               _NEW_TEXTURE|                     \
 307                               _SWRAST_NEW_RASTERMASK|           \
 308                               _NEW_LIGHT|                       \
 309                               _NEW_FOG |                        \
 310                               _DD_NEW_SEPARATE_SPECULAR)
 311
 312 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 313                           _NEW_RENDERMODE|              \
 314                           _NEW_LINE|                    \
 315                           _NEW_TEXTURE|                 \
 316                           _NEW_LIGHT|                   \
 317                           _NEW_FOG|                     \
 318                           _NEW_DEPTH |                  \
 319                           _DD_NEW_SEPARATE_SPECULAR)
 320
 321 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 322                            _NEW_RENDERMODE |            \
 323                            _NEW_POINT |                 \
 324                            _NEW_TEXTURE |               \
 325                            _NEW_LIGHT |                 \
 326                            _NEW_FOG |                   \
 327                            _DD_NEW_SEPARATE_SPECULAR)
 328
 329 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 330
 331 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 332
 333 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 334
 335
 336
 337 /**
 338  * Stub for swrast->Triangle to select a true triangle function
 339  * after a state change.
 340  */
 341 static void
 342 _swrast_validate_triangle( struct gl_context *ctx,
 343                            const SWvertex *v0,
 344                            const SWvertex *v1,
 345                            const SWvertex *v2 )
 346 {
 347    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 348
 349    _swrast_validate_derived( ctx );
 350    swrast->choose_triangle( ctx );
 351    ASSERT(swrast->Triangle);
 352
 353    if (swrast->SpecularVertexAdd) {
 354       /* separate specular color, but no texture */
 355       swrast->SpecTriangle = swrast->Triangle;
 356       swrast->Triangle = _swrast_add_spec_terms_triangle;
 357    }
 358
 359    swrast->Triangle( ctx, v0, v1, v2 );
 360 }
 361
 362 /**
 363  * Called via swrast->Line.  Examine current GL state and choose a software
 364  * line routine.  Then call it.
 365  */
 366 static void
 367 _swrast_validate_line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 368 {
 369    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 370
 371    _swrast_validate_derived( ctx );
 372    swrast->choose_line( ctx );
 373    ASSERT(swrast->Line);
 374
 375    if (swrast->SpecularVertexAdd) {
 376       swrast->SpecLine = swrast->Line;
 377       swrast->Line = _swrast_add_spec_terms_line;
 378    }
 379
 380    swrast->Line( ctx, v0, v1 );
 381 }
 382
 383 /**
 384  * Called via swrast->Point.  Examine current GL state and choose a software
 385  * point routine.  Then call it.
 386  */
 387 static void
 388 _swrast_validate_point( struct gl_context *ctx, const SWvertex *v0 )
 389 {
 390    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 391
 392    _swrast_validate_derived( ctx );
 393    swrast->choose_point( ctx );
 394
 395    if (swrast->SpecularVertexAdd) {
 396       swrast->SpecPoint = swrast->Point;
 397       swrast->Point = _swrast_add_spec_terms_point;
 398    }
 399
 400    swrast->Point( ctx, v0 );
 401 }
 402
 403
 404 /**
 405  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 406  * function, then call it.
 407  */
 408 static void _ASMAPI
 409 _swrast_validate_blend_func(struct gl_context *ctx, GLuint n, const GLubyte mask[],
 410                             GLvoid *src, const GLvoid *dst,
 411                             GLenum chanType )
 412 {
 413    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 414
 415    _swrast_validate_derived( ctx ); /* why is this needed? */
 416    _swrast_choose_blend_func( ctx, chanType );
 417
 418    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 419 }
 420
 421 static void
 422 _swrast_sleep( struct gl_context *ctx, GLbitfield new_state )
 423 {
 424    (void) ctx; (void) new_state;
 425 }
 426
 427
 428 static void
 429 _swrast_invalidate_state( struct gl_context *ctx, GLbitfield new_state )
 430 {
 431    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 432    GLuint i;
 433
 434    swrast->NewState |= new_state;
 435
 436    /* After 10 statechanges without any swrast functions being called,
 437     * put the module to sleep.
 438     */
 439    if (++swrast->StateChanges > 10) {
 440       swrast->InvalidateState = _swrast_sleep;
 441       swrast->NewState = ~0;
 442       new_state = ~0;
 443    }
 444
 445    if (new_state & swrast->InvalidateTriangleMask)
 446       swrast->Triangle = _swrast_validate_triangle;
 447
 448    if (new_state & swrast->InvalidateLineMask)
 449       swrast->Line = _swrast_validate_line;
 450
 451    if (new_state & swrast->InvalidatePointMask)
 452       swrast->Point = _swrast_validate_point;
 453
 454    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 455       swrast->BlendFunc = _swrast_validate_blend_func;
 456
 457    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 458       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 459          swrast->TextureSample[i] = NULL;
 460 }
 461
 462
 463 void
 464 _swrast_update_texture_samplers(struct gl_context *ctx)
 465 {
 466    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 467    GLuint u;
 468
 469    if (!swrast)
 470       return; /* pipe hack */
 471
 472    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 473       struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 474       /* Note: If tObj is NULL, the sample function will be a simple
 475        * function that just returns opaque black (0,0,0,1).
 476        */
 477       if (tObj) {
 478          _mesa_update_fetch_functions(tObj);
 479          swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 480       }
 481    }
 482 }
 483
 484
 485 /**
 486  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 487  * swrast->_ActiveAtttribMask.
 488  */
 489 static void
 490 _swrast_update_active_attribs(struct gl_context *ctx)
 491 {
 492    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 493    GLuint attribsMask;
 494
 495    /*
 496     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 497     */
 498    if (ctx->FragmentProgram._Current) {
 499       /* fragment program/shader */
 500       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 501       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 502    }
 503    else if (ctx->ATIFragmentShader._Enabled) {
 504       attribsMask = ~0;  /* XXX fix me */
 505    }
 506    else {
 507       /* fixed function */
 508       attribsMask = 0x0;
 509
 510 #if CHAN_TYPE == GL_FLOAT
 511       attribsMask |= FRAG_BIT_COL0;
 512 #endif
 513
 514       if (ctx->Fog.ColorSumEnabled ||
 515           (ctx->Light.Enabled &&
 516            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 517          attribsMask |= FRAG_BIT_COL1;
 518       }
 519
 520       if (swrast->_FogEnabled)
 521          attribsMask |= FRAG_BIT_FOGC;
 522
 523       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 524    }
 525
 526    swrast->_ActiveAttribMask = attribsMask;
 527
 528    /* Update _ActiveAttribs[] list */
 529    {
 530       GLuint i, num = 0;
 531       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 532          if (attribsMask & (1 << i)) {
 533             swrast->_ActiveAttribs[num++] = i;
 534             /* how should this attribute be interpolated? */
 535             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 536                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 537             else
 538                swrast->_InterpMode[i] = GL_SMOOTH;
 539          }
 540       }
 541       swrast->_NumActiveAttribs = num;
 542    }
 543 }
 544
 545
 546 void
 547 _swrast_validate_derived( struct gl_context *ctx )
 548 {
 549    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 550
 551    if (swrast->NewState) {
 552       if (swrast->NewState & _NEW_POLYGON)
 553          _swrast_update_polygon( ctx );
 554
 555       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 556          _swrast_update_fog_hint( ctx );
 557
 558       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 559          _swrast_update_texture_env( ctx );
 560
 561       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 562          _swrast_update_fog_state( ctx );
 563
 564       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 565          _swrast_update_fragment_program( ctx, swrast->NewState );
 566
 567       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 568          _swrast_update_texture_samplers( ctx );
 569       }
 570
 571       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 572          _swrast_update_deferred_texture(ctx);
 573
 574       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 575          _swrast_update_rasterflags( ctx );
 576
 577       if (swrast->NewState & (_NEW_DEPTH |
 578                               _NEW_FOG |
 579                               _NEW_LIGHT |
 580                               _NEW_PROGRAM |
 581                               _NEW_TEXTURE))
 582          _swrast_update_active_attribs(ctx);
 583
 584       if (swrast->NewState & (_NEW_FOG |
 585                               _NEW_PROGRAM |
 586                               _NEW_LIGHT |
 587                               _NEW_TEXTURE))
 588          _swrast_update_specular_vertex_add(ctx);
 589
 590       swrast->NewState = 0;
 591       swrast->StateChanges = 0;
 592       swrast->InvalidateState = _swrast_invalidate_state;
 593    }
 594 }
 595
 596 #define SWRAST_DEBUG 0
 597
 598 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 599  */
 600 void
 601 _swrast_Quad( struct gl_context *ctx,
 602               const SWvertex *v0, const SWvertex *v1,
 603               const SWvertex *v2, const SWvertex *v3 )
 604 {
 605    if (SWRAST_DEBUG) {
 606       _mesa_debug(ctx, "_swrast_Quad\n");
 607       _swrast_print_vertex( ctx, v0 );
 608       _swrast_print_vertex( ctx, v1 );
 609       _swrast_print_vertex( ctx, v2 );
 610       _swrast_print_vertex( ctx, v3 );
 611    }
 612    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 613    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 614 }
 615
 616 void
 617 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 618                   const SWvertex *v1, const SWvertex *v2 )
 619 {
 620    if (SWRAST_DEBUG) {
 621       _mesa_debug(ctx, "_swrast_Triangle\n");
 622       _swrast_print_vertex( ctx, v0 );
 623       _swrast_print_vertex( ctx, v1 );
 624       _swrast_print_vertex( ctx, v2 );
 625    }
 626    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 627 }
 628
 629 void
 630 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 631 {
 632    if (SWRAST_DEBUG) {
 633       _mesa_debug(ctx, "_swrast_Line\n");
 634       _swrast_print_vertex( ctx, v0 );
 635       _swrast_print_vertex( ctx, v1 );
 636    }
 637    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 638 }
 639
 640 void
 641 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 642 {
 643    if (SWRAST_DEBUG) {
 644       _mesa_debug(ctx, "_swrast_Point\n");
 645       _swrast_print_vertex( ctx, v0 );
 646    }
 647    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 648 }
 649
 650 void
 651 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 652 {
 653    if (SWRAST_DEBUG) {
 654       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 655    }
 656    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 657 }
 658
 659 void
 660 _swrast_ResetLineStipple( struct gl_context *ctx )
 661 {
 662    if (SWRAST_DEBUG) {
 663       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 664    }
 665    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 666 }
 667
 668 void
 669 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 670 {
 671    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 672 }
 673
 674 void
 675 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 676 {
 677    if (SWRAST_DEBUG) {
 678       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 679    }
 680    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 681    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 682 }
 683
 684 void
 685 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 686 {
 687    if (SWRAST_DEBUG) {
 688       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 689    }
 690    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 691    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 692 }
 693
 694
 695 /**
 696  * Initialize native program limits by copying the logical limits.
 697  * See comments in init_program_limits() in context.c
 698  */
 699 static void
 700 init_program_native_limits(struct gl_program_constants *prog)
 701 {
 702    prog->MaxNativeInstructions = prog->MaxInstructions;
 703    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 704    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 705    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 706    prog->MaxNativeAttribs = prog->MaxAttribs;
 707    prog->MaxNativeTemps = prog->MaxTemps;
 708    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 709    prog->MaxNativeParameters = prog->MaxParameters;
 710 }
 711
 712
 713 GLboolean
 714 _swrast_CreateContext( struct gl_context *ctx )
 715 {
 716    GLuint i;
 717    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 718 #ifdef _OPENMP
 719    const GLint maxThreads = omp_get_max_threads();
 720 #else
 721    const GLint maxThreads = 1;
 722 #endif
 723
 724    if (SWRAST_DEBUG) {
 725       _mesa_debug(ctx, "_swrast_CreateContext\n");
 726    }
 727
 728    if (!swrast)
 729       return GL_FALSE;
 730
 731    swrast->NewState = ~0;
 732
 733    swrast->choose_point = _swrast_choose_point;
 734    swrast->choose_line = _swrast_choose_line;
 735    swrast->choose_triangle = _swrast_choose_triangle;
 736
 737    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 738    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 739    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 740
 741    swrast->Point = _swrast_validate_point;
 742    swrast->Line = _swrast_validate_line;
 743    swrast->Triangle = _swrast_validate_triangle;
 744    swrast->InvalidateState = _swrast_sleep;
 745    swrast->BlendFunc = _swrast_validate_blend_func;
 746
 747    swrast->AllowVertexFog = GL_TRUE;
 748    swrast->AllowPixelFog = GL_TRUE;
 749
 750    /* Optimized Accum buffer */
 751    swrast->_IntegerAccumMode = GL_FALSE;
 752    swrast->_IntegerAccumScaler = 0.0;
 753
 754    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 755       swrast->TextureSample[i] = NULL;
 756
 757    /* SpanArrays is global and shared by all SWspan instances. However, when
 758     * using multiple threads, it is necessary to have one SpanArrays instance
 759     * per thread.
 760     */
 761    swrast->SpanArrays = (SWspanarrays *) MALLOC(maxThreads * sizeof(SWspanarrays));
 762    if (!swrast->SpanArrays) {
 763       FREE(swrast);
 764       return GL_FALSE;
 765    }
 766    for(i = 0; i < maxThreads; i++) {
 767       swrast->SpanArrays[i].ChanType = CHAN_TYPE;
 768 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 769       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba8;
 770 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 771       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba16;
 772 #else
 773       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].attribs[FRAG_ATTRIB_COL0];
 774 #endif
 775    }
 776
 777    /* init point span buffer */
 778    swrast->PointSpan.primitive = GL_POINT;
 779    swrast->PointSpan.end = 0;
 780    swrast->PointSpan.facing = 0;
 781    swrast->PointSpan.array = swrast->SpanArrays;
 782
 783    /* TexelBuffer is also global and normally shared by all SWspan instances;
 784     * when running with multiple threads, create one per thread.
 785     */
 786    swrast->TexelBuffer = (GLfloat *) MALLOC(ctx->Const.MaxTextureImageUnits * maxThreads *
 787                                            MAX_WIDTH * 4 * sizeof(GLfloat));
 788    if (!swrast->TexelBuffer) {
 789       FREE(swrast->SpanArrays);
 790       FREE(swrast);
 791       return GL_FALSE;
 792    }
 793
 794    init_program_native_limits(&ctx->Const.VertexProgram);
 795    init_program_native_limits(&ctx->Const.GeometryProgram);
 796    init_program_native_limits(&ctx->Const.FragmentProgram);
 797
 798    ctx->swrast_context = swrast;
 799
 800    return GL_TRUE;
 801 }
 802
 803 void
 804 _swrast_DestroyContext( struct gl_context *ctx )
 805 {
 806    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 807
 808    if (SWRAST_DEBUG) {
 809       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 810    }
 811
 812    FREE( swrast->SpanArrays );
 813    if (swrast->ZoomedArrays)
 814       FREE( swrast->ZoomedArrays );
 815    FREE( swrast->TexelBuffer );
 816    FREE( swrast );
 817
 818    ctx->swrast_context = 0;
 819 }
 820
 821
 822 struct swrast_device_driver *
 823 _swrast_GetDeviceDriverReference( struct gl_context *ctx )
 824 {
 825    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 826    return &swrast->Driver;
 827 }
 828
 829 void
 830 _swrast_flush( struct gl_context *ctx )
 831 {
 832    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 833    /* flush any pending fragments from rendering points */
 834    if (swrast->PointSpan.end > 0) {
 835       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 836       swrast->PointSpan.end = 0;
 837    }
 838 }
 839
 840 void
 841 _swrast_render_primitive( struct gl_context *ctx, GLenum prim )
 842 {
 843    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 844    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 845       _swrast_flush(ctx);
 846    }
 847    swrast->Primitive = prim;
 848 }
 849
 850
 851 void
 852 _swrast_render_start( struct gl_context *ctx )
 853 {
 854    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 855    if (swrast->Driver.SpanRenderStart)
 856       swrast->Driver.SpanRenderStart( ctx );
 857    swrast->PointSpan.end = 0;
 858 }
 859
 860 void
 861 _swrast_render_finish( struct gl_context *ctx )
 862 {
 863    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 864    if (swrast->Driver.SpanRenderFinish)
 865       swrast->Driver.SpanRenderFinish( ctx );
 866
 867    _swrast_flush(ctx);
 868 }
 869
 870
 871 #define SWRAST_DEBUG_VERTICES 0
 872
 873 void
 874 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 875 {
 876    GLuint i;
 877
 878    if (SWRAST_DEBUG_VERTICES) {
 879       _mesa_debug(ctx, "win %f %f %f %f\n",
 880                   v->attrib[FRAG_ATTRIB_WPOS][0],
 881                   v->attrib[FRAG_ATTRIB_WPOS][1],
 882                   v->attrib[FRAG_ATTRIB_WPOS][2],
 883                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 884
 885       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 886          if (ctx->Texture.Unit[i]._ReallyEnabled)
 887             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 888                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 889                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 890                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 891                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 892
 893 #if CHAN_TYPE == GL_FLOAT
 894       _mesa_debug(ctx, "color %f %f %f %f\n",
 895                   v->color[0], v->color[1], v->color[2], v->color[3]);
 896 #else
 897       _mesa_debug(ctx, "color %d %d %d %d\n",
 898                   v->color[0], v->color[1], v->color[2], v->color[3]);
 899 #endif
 900       _mesa_debug(ctx, "spec %g %g %g %g\n",
 901                   v->attrib[FRAG_ATTRIB_COL1][0],
 902                   v->attrib[FRAG_ATTRIB_COL1][1],
 903                   v->attrib[FRAG_ATTRIB_COL1][2],
 904                   v->attrib[FRAG_ATTRIB_COL1][3]);
 905       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 906       _mesa_debug(ctx, "index %f\n", v->attrib[FRAG_ATTRIB_CI][0]);
 907       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 908       _mesa_debug(ctx, "\n");
 909    }
 910 }