reactos/dll/opengl/mesa/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
  85    /* If we're not drawing to exactly one color buffer set the
  86     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  87     * buffers or the RGBA or CI mask disables all writes.
  88     */
  89    if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
  90       /* more than one color buffer designated for writing (or zero buffers) */
  91       rasterMask |= MULTI_DRAW_BIT;
  92    }
  93
  94    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  95       if (ctx->Color.ColorMask[i][0] +
  96           ctx->Color.ColorMask[i][1] +
  97           ctx->Color.ColorMask[i][2] +
  98           ctx->Color.ColorMask[i][3] == 0) {
  99          rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 100          break;
 101       }
 102    }
 103
 104 #if CHAN_TYPE == GL_FLOAT
 105    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 106       rasterMask |= CLAMPING_BIT;
 107    }
 108 #endif
 109
 110    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 111 }
 112
 113
 114 /**
 115  * Examine polygon cull state to compute the _BackfaceCullSign field.
 116  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 117  * and 1 if culling front-faces.  The Polygon FrontFace state also
 118  * factors in.
 119  */
 120 static void
 121 _swrast_update_polygon( struct gl_context *ctx )
 122 {
 123    GLfloat backface_sign;
 124
 125    if (ctx->Polygon.CullFlag) {
 126       switch (ctx->Polygon.CullFaceMode) {
 127       case GL_BACK:
 128          backface_sign = -1.0F;
 129          break;
 130       case GL_FRONT:
 131          backface_sign = 1.0F;
 132          break;
 133       case GL_FRONT_AND_BACK:
 134          /* fallthrough */
 135       default:
 136          backface_sign = 0.0F;
 137       }
 138    }
 139    else {
 140       backface_sign = 0.0F;
 141    }
 142
 143    SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
 144
 145    /* This is for front/back-face determination, but not for culling */
 146    SWRAST_CONTEXT(ctx)->_BackfaceSign
 147       = (ctx->Polygon.FrontFace == GL_CW) ? -1.0F : 1.0F;
 148 }
 149
 150
 151
 152 /**
 153  * Update the _PreferPixelFog field to indicate if we need to compute
 154  * fog blend factors (from the fog coords) per-fragment.
 155  */
 156 static void
 157 _swrast_update_fog_hint( struct gl_context *ctx )
 158 {
 159    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 160    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 161                               (ctx->Hint.Fog == GL_NICEST &&
 162                                swrast->AllowPixelFog));
 163 }
 164
 165
 166
 167 /**
 168  * Update the swrast->_TextureCombinePrimary flag.
 169  */
 170 static void
 171 _swrast_update_texture_env( struct gl_context *ctx )
 172 {
 173    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 174    GLuint i;
 175
 176    swrast->_TextureCombinePrimary = GL_FALSE;
 177
 178    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 179       const struct gl_tex_env_combine_state *combine =
 180          ctx->Texture.Unit[i]._CurrentCombine;
 181       GLuint term;
 182       for (term = 0; term < combine->_NumArgsRGB; term++) {
 183          if (combine->SourceRGB[term] == GL_PRIMARY_COLOR) {
 184             swrast->_TextureCombinePrimary = GL_TRUE;
 185             return;
 186          }
 187          if (combine->SourceA[term] == GL_PRIMARY_COLOR) {
 188             swrast->_TextureCombinePrimary = GL_TRUE;
 189             return;
 190          }
 191       }
 192    }
 193 }
 194
 195
 196 /**
 197  * Determine if we can defer texturing/shading until after Z/stencil
 198  * testing.  This potentially allows us to skip texturing/shading for
 199  * lots of fragments.
 200  */
 201 static void
 202 _swrast_update_deferred_texture(struct gl_context *ctx)
 203 {
 204    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 205    if (ctx->Color.AlphaEnabled) {
 206       /* alpha test depends on post-texture/shader colors */
 207       swrast->_DeferredTexture = GL_FALSE;
 208    }
 209    else {
 210       swrast->_DeferredTexture = GL_TRUE;
 211    }
 212 }
 213
 214
 215 /**
 216  * Update swrast->_FogColor and swrast->_FogEnable values.
 217  */
 218 static void
 219 _swrast_update_fog_state( struct gl_context *ctx )
 220 {
 221    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 222    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 223
 224    assert((fp == NULL) ||
 225           (fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) ||
 226           (fp->Base.Target == GL_FRAGMENT_PROGRAM_NV));
 227
 228    /* determine if fog is needed, and if so, which fog mode */
 229    swrast->_FogEnabled = ctx->Fog.Enabled;
 230 }
 231
 232
 233 /**
 234  * See if we can do early diffuse+specular (primary+secondary) color
 235  * add per vertex instead of per-fragment.
 236  */
 237 static void
 238 _swrast_update_specular_vertex_add(struct gl_context *ctx)
 239 {
 240    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 241    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 242       (ctx->Light.Enabled &&
 243        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 244
 245    swrast->SpecularVertexAdd = (separateSpecular
 246                                 && ctx->Texture._EnabledUnits == 0x0);
 247 }
 248
 249
 250 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 251                              _NEW_PROGRAM_CONSTANTS |   \
 252                              _NEW_TEXTURE |             \
 253                              _NEW_HINT |                \
 254                              _NEW_POLYGON )
 255
 256 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 257  */
 258 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 259                               _NEW_RENDERMODE|                  \
 260                               _NEW_POLYGON|                     \
 261                               _NEW_DEPTH|                       \
 262                               _NEW_STENCIL|                     \
 263                               _NEW_COLOR|                       \
 264                               _NEW_TEXTURE|                     \
 265                               _SWRAST_NEW_RASTERMASK|           \
 266                               _NEW_LIGHT|                       \
 267                               _NEW_FOG |                        \
 268                               _DD_NEW_SEPARATE_SPECULAR)
 269
 270 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 271                           _NEW_RENDERMODE|              \
 272                           _NEW_LINE|                    \
 273                           _NEW_TEXTURE|                 \
 274                           _NEW_LIGHT|                   \
 275                           _NEW_FOG|                     \
 276                           _NEW_DEPTH |                  \
 277                           _DD_NEW_SEPARATE_SPECULAR)
 278
 279 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 280                            _NEW_RENDERMODE |            \
 281                            _NEW_POINT |                 \
 282                            _NEW_TEXTURE |               \
 283                            _NEW_LIGHT |                 \
 284                            _NEW_FOG |                   \
 285                            _DD_NEW_SEPARATE_SPECULAR)
 286
 287 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 288
 289 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 290
 291 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 292
 293
 294
 295 /**
 296  * Stub for swrast->Triangle to select a true triangle function
 297  * after a state change.
 298  */
 299 static void
 300 _swrast_validate_triangle( struct gl_context *ctx,
 301                            const SWvertex *v0,
 302                            const SWvertex *v1,
 303                            const SWvertex *v2 )
 304 {
 305    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 306
 307    _swrast_validate_derived( ctx );
 308    swrast->choose_triangle( ctx );
 309    ASSERT(swrast->Triangle);
 310
 311    if (swrast->SpecularVertexAdd) {
 312       /* separate specular color, but no texture */
 313       swrast->SpecTriangle = swrast->Triangle;
 314       swrast->Triangle = _swrast_add_spec_terms_triangle;
 315    }
 316
 317    swrast->Triangle( ctx, v0, v1, v2 );
 318 }
 319
 320 /**
 321  * Called via swrast->Line.  Examine current GL state and choose a software
 322  * line routine.  Then call it.
 323  */
 324 static void
 325 _swrast_validate_line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 326 {
 327    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 328
 329    _swrast_validate_derived( ctx );
 330    swrast->choose_line( ctx );
 331    ASSERT(swrast->Line);
 332
 333    if (swrast->SpecularVertexAdd) {
 334       swrast->SpecLine = swrast->Line;
 335       swrast->Line = _swrast_add_spec_terms_line;
 336    }
 337
 338    swrast->Line( ctx, v0, v1 );
 339 }
 340
 341 /**
 342  * Called via swrast->Point.  Examine current GL state and choose a software
 343  * point routine.  Then call it.
 344  */
 345 static void
 346 _swrast_validate_point( struct gl_context *ctx, const SWvertex *v0 )
 347 {
 348    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 349
 350    _swrast_validate_derived( ctx );
 351    swrast->choose_point( ctx );
 352
 353    if (swrast->SpecularVertexAdd) {
 354       swrast->SpecPoint = swrast->Point;
 355       swrast->Point = _swrast_add_spec_terms_point;
 356    }
 357
 358    swrast->Point( ctx, v0 );
 359 }
 360
 361
 362 /**
 363  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 364  * function, then call it.
 365  */
 366 static void _ASMAPI
 367 _swrast_validate_blend_func(struct gl_context *ctx, GLuint n, const GLubyte mask[],
 368                             GLvoid *src, const GLvoid *dst,
 369                             GLenum chanType )
 370 {
 371    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 372
 373    _swrast_validate_derived( ctx ); /* why is this needed? */
 374    _swrast_choose_blend_func( ctx, chanType );
 375
 376    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 377 }
 378
 379 static void
 380 _swrast_sleep( struct gl_context *ctx, GLbitfield new_state )
 381 {
 382    (void) ctx; (void) new_state;
 383 }
 384
 385
 386 static void
 387 _swrast_invalidate_state( struct gl_context *ctx, GLbitfield new_state )
 388 {
 389    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 390    GLuint i;
 391
 392    swrast->NewState |= new_state;
 393
 394    /* After 10 statechanges without any swrast functions being called,
 395     * put the module to sleep.
 396     */
 397    if (++swrast->StateChanges > 10) {
 398       swrast->InvalidateState = _swrast_sleep;
 399       swrast->NewState = ~0;
 400       new_state = ~0;
 401    }
 402
 403    if (new_state & swrast->InvalidateTriangleMask)
 404       swrast->Triangle = _swrast_validate_triangle;
 405
 406    if (new_state & swrast->InvalidateLineMask)
 407       swrast->Line = _swrast_validate_line;
 408
 409    if (new_state & swrast->InvalidatePointMask)
 410       swrast->Point = _swrast_validate_point;
 411
 412    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 413       swrast->BlendFunc = _swrast_validate_blend_func;
 414
 415    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 416       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 417          swrast->TextureSample[i] = NULL;
 418 }
 419
 420
 421 void
 422 _swrast_update_texture_samplers(struct gl_context *ctx)
 423 {
 424    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 425    GLuint u;
 426
 427    if (!swrast)
 428       return; /* pipe hack */
 429
 430    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 431       struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 432       /* Note: If tObj is NULL, the sample function will be a simple
 433        * function that just returns opaque black (0,0,0,1).
 434        */
 435       if (tObj) {
 436          _mesa_update_fetch_functions(tObj);
 437       }
 438       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 439    }
 440 }
 441
 442
 443 /**
 444  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 445  * swrast->_ActiveAtttribMask.
 446  */
 447 static void
 448 _swrast_update_active_attribs(struct gl_context *ctx)
 449 {
 450    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 451    GLbitfield64 attribsMask;
 452
 453    /*
 454     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 455     */
 456    attribsMask = 0x0;
 457
 458 #if CHAN_TYPE == GL_FLOAT
 459    attribsMask |= FRAG_BIT_COL0;
 460 #endif
 461
 462    if (ctx->Fog.ColorSumEnabled ||
 463        (ctx->Light.Enabled &&
 464         ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 465       attribsMask |= FRAG_BIT_COL1;
 466    }
 467
 468    if (swrast->_FogEnabled)
 469       attribsMask |= FRAG_BIT_FOGC;
 470
 471    attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 472
 473    swrast->_ActiveAttribMask = attribsMask;
 474
 475    /* Update _ActiveAttribs[] list */
 476    {
 477       GLuint i, num = 0;
 478       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 479          if (attribsMask & BITFIELD64_BIT(i)) {
 480             swrast->_ActiveAttribs[num++] = i;
 481             /* how should this attribute be interpolated? */
 482             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 483                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 484             else
 485                swrast->_InterpMode[i] = GL_SMOOTH;
 486          }
 487       }
 488       swrast->_NumActiveAttribs = num;
 489    }
 490 }
 491
 492
 493 void
 494 _swrast_validate_derived( struct gl_context *ctx )
 495 {
 496    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 497
 498    if (swrast->NewState) {
 499       if (swrast->NewState & _NEW_POLYGON)
 500          _swrast_update_polygon( ctx );
 501
 502       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 503          _swrast_update_fog_hint( ctx );
 504
 505       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 506          _swrast_update_texture_env( ctx );
 507
 508       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 509          _swrast_update_fog_state( ctx );
 510
 511       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 512          _swrast_update_texture_samplers( ctx );
 513       }
 514
 515       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 516          _swrast_update_deferred_texture(ctx);
 517
 518       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 519          _swrast_update_rasterflags( ctx );
 520
 521       if (swrast->NewState & (_NEW_DEPTH |
 522                               _NEW_FOG |
 523                               _NEW_LIGHT |
 524                               _NEW_PROGRAM |
 525                               _NEW_TEXTURE))
 526          _swrast_update_active_attribs(ctx);
 527
 528       if (swrast->NewState & (_NEW_FOG |
 529                               _NEW_PROGRAM |
 530                               _NEW_LIGHT |
 531                               _NEW_TEXTURE))
 532          _swrast_update_specular_vertex_add(ctx);
 533
 534       swrast->NewState = 0;
 535       swrast->StateChanges = 0;
 536       swrast->InvalidateState = _swrast_invalidate_state;
 537    }
 538 }
 539
 540 #define SWRAST_DEBUG 0
 541
 542 /* Public entrypoints:  See also s_bitmap.c, etc.
 543  */
 544 void
 545 _swrast_Quad( struct gl_context *ctx,
 546               const SWvertex *v0, const SWvertex *v1,
 547               const SWvertex *v2, const SWvertex *v3 )
 548 {
 549    if (SWRAST_DEBUG) {
 550       _mesa_debug(ctx, "_swrast_Quad\n");
 551       _swrast_print_vertex( ctx, v0 );
 552       _swrast_print_vertex( ctx, v1 );
 553       _swrast_print_vertex( ctx, v2 );
 554       _swrast_print_vertex( ctx, v3 );
 555    }
 556    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 557    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 558 }
 559
 560 void
 561 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 562                   const SWvertex *v1, const SWvertex *v2 )
 563 {
 564    if (SWRAST_DEBUG) {
 565       _mesa_debug(ctx, "_swrast_Triangle\n");
 566       _swrast_print_vertex( ctx, v0 );
 567       _swrast_print_vertex( ctx, v1 );
 568       _swrast_print_vertex( ctx, v2 );
 569    }
 570    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 571 }
 572
 573 void
 574 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 575 {
 576    if (SWRAST_DEBUG) {
 577       _mesa_debug(ctx, "_swrast_Line\n");
 578       _swrast_print_vertex( ctx, v0 );
 579       _swrast_print_vertex( ctx, v1 );
 580    }
 581    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 582 }
 583
 584 void
 585 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 586 {
 587    if (SWRAST_DEBUG) {
 588       _mesa_debug(ctx, "_swrast_Point\n");
 589       _swrast_print_vertex( ctx, v0 );
 590    }
 591    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 592 }
 593
 594 void
 595 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 596 {
 597    if (SWRAST_DEBUG) {
 598       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 599    }
 600    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 601 }
 602
 603 void
 604 _swrast_ResetLineStipple( struct gl_context *ctx )
 605 {
 606    if (SWRAST_DEBUG) {
 607       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 608    }
 609    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 610 }
 611
 612 void
 613 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 614 {
 615    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 616 }
 617
 618 void
 619 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 620 {
 621    if (SWRAST_DEBUG) {
 622       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 623    }
 624    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 625    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 626 }
 627
 628 void
 629 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 630 {
 631    if (SWRAST_DEBUG) {
 632       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 633    }
 634    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 635    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 636 }
 637
 638
 639 /**
 640  * Initialize native program limits by copying the logical limits.
 641  * See comments in init_program_limits() in context.c
 642  */
 643 static void
 644 init_program_native_limits(struct gl_program_constants *prog)
 645 {
 646    prog->MaxNativeInstructions = prog->MaxInstructions;
 647    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 648    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 649    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 650    prog->MaxNativeAttribs = prog->MaxAttribs;
 651    prog->MaxNativeTemps = prog->MaxTemps;
 652    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 653    prog->MaxNativeParameters = prog->MaxParameters;
 654 }
 655
 656
 657 GLboolean
 658 _swrast_CreateContext( struct gl_context *ctx )
 659 {
 660    GLuint i;
 661    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 662 #ifdef _OPENMP
 663    const GLuint maxThreads = omp_get_max_threads();
 664 #else
 665    const GLuint maxThreads = 1;
 666 #endif
 667
 668    if (SWRAST_DEBUG) {
 669       _mesa_debug(ctx, "_swrast_CreateContext\n");
 670    }
 671
 672    if (!swrast)
 673       return GL_FALSE;
 674
 675    swrast->NewState = ~0;
 676
 677    swrast->choose_point = _swrast_choose_point;
 678    swrast->choose_line = _swrast_choose_line;
 679    swrast->choose_triangle = _swrast_choose_triangle;
 680
 681    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 682    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 683    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 684
 685    swrast->Point = _swrast_validate_point;
 686    swrast->Line = _swrast_validate_line;
 687    swrast->Triangle = _swrast_validate_triangle;
 688    swrast->InvalidateState = _swrast_sleep;
 689    swrast->BlendFunc = _swrast_validate_blend_func;
 690
 691    swrast->AllowVertexFog = GL_TRUE;
 692    swrast->AllowPixelFog = GL_TRUE;
 693
 694    swrast->Driver.SpanRenderStart = _swrast_span_render_start;
 695    swrast->Driver.SpanRenderFinish = _swrast_span_render_finish;
 696
 697    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 698       swrast->TextureSample[i] = NULL;
 699
 700    /* SpanArrays is global and shared by all SWspan instances. However, when
 701     * using multiple threads, it is necessary to have one SpanArrays instance
 702     * per thread.
 703     */
 704    swrast->SpanArrays = (SWspanarrays *) MALLOC(maxThreads * sizeof(SWspanarrays));
 705    if (!swrast->SpanArrays) {
 706       FREE(swrast);
 707       return GL_FALSE;
 708    }
 709    for(i = 0; i < maxThreads; i++) {
 710       swrast->SpanArrays[i].ChanType = CHAN_TYPE;
 711 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 712       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba8;
 713 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 714       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba16;
 715 #else
 716       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].attribs[FRAG_ATTRIB_COL0];
 717 #endif
 718    }
 719
 720    /* init point span buffer */
 721    swrast->PointSpan.primitive = GL_POINT;
 722    swrast->PointSpan.end = 0;
 723    swrast->PointSpan.facing = 0;
 724    swrast->PointSpan.array = swrast->SpanArrays;
 725
 726    init_program_native_limits(&ctx->Const.VertexProgram);
 727    init_program_native_limits(&ctx->Const.FragmentProgram);
 728
 729    ctx->swrast_context = swrast;
 730
 731    return GL_TRUE;
 732 }
 733
 734 void
 735 _swrast_DestroyContext( struct gl_context *ctx )
 736 {
 737    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 738
 739    if (SWRAST_DEBUG) {
 740       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 741    }
 742
 743    FREE( swrast->SpanArrays );
 744    if (swrast->ZoomedArrays)
 745       FREE( swrast->ZoomedArrays );
 746    FREE( swrast->TexelBuffer );
 747    FREE( swrast );
 748
 749    ctx->swrast_context = 0;
 750 }
 751
 752
 753 struct swrast_device_driver *
 754 _swrast_GetDeviceDriverReference( struct gl_context *ctx )
 755 {
 756    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 757    return &swrast->Driver;
 758 }
 759
 760 void
 761 _swrast_flush( struct gl_context *ctx )
 762 {
 763    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 764    /* flush any pending fragments from rendering points */
 765    if (swrast->PointSpan.end > 0) {
 766       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 767       swrast->PointSpan.end = 0;
 768    }
 769 }
 770
 771 void
 772 _swrast_render_primitive( struct gl_context *ctx, GLenum prim )
 773 {
 774    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 775    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 776       _swrast_flush(ctx);
 777    }
 778    swrast->Primitive = prim;
 779 }
 780
 781
 782 /** called via swrast->Driver.SpanRenderStart() */
 783 void
 784 _swrast_span_render_start(struct gl_context *ctx)
 785 {
 786    _swrast_map_textures(ctx);
 787    _swrast_map_renderbuffers(ctx);
 788 }
 789
 790
 791 /** called via swrast->Driver.SpanRenderFinish() */
 792 void
 793 _swrast_span_render_finish(struct gl_context *ctx)
 794 {
 795    _swrast_unmap_textures(ctx);
 796    _swrast_unmap_renderbuffers(ctx);
 797 }
 798
 799
 800 void
 801 _swrast_render_start( struct gl_context *ctx )
 802 {
 803    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 804    if (swrast->Driver.SpanRenderStart)
 805       swrast->Driver.SpanRenderStart( ctx );
 806    swrast->PointSpan.end = 0;
 807 }
 808
 809 void
 810 _swrast_render_finish( struct gl_context *ctx )
 811 {
 812    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 813
 814    _swrast_flush(ctx);
 815
 816    if (swrast->Driver.SpanRenderFinish)
 817       swrast->Driver.SpanRenderFinish( ctx );
 818 }
 819
 820
 821 #define SWRAST_DEBUG_VERTICES 0
 822
 823 void
 824 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 825 {
 826    GLuint i;
 827
 828    if (SWRAST_DEBUG_VERTICES) {
 829       _mesa_debug(ctx, "win %f %f %f %f\n",
 830                   v->attrib[FRAG_ATTRIB_WPOS][0],
 831                   v->attrib[FRAG_ATTRIB_WPOS][1],
 832                   v->attrib[FRAG_ATTRIB_WPOS][2],
 833                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 834
 835       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 836          if (ctx->Texture.Unit[i]._ReallyEnabled)
 837             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 838                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 839                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 840                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 841                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 842
 843 #if CHAN_TYPE == GL_FLOAT
 844       _mesa_debug(ctx, "color %f %f %f %f\n",
 845                   v->color[0], v->color[1], v->color[2], v->color[3]);
 846 #else
 847       _mesa_debug(ctx, "color %d %d %d %d\n",
 848                   v->color[0], v->color[1], v->color[2], v->color[3]);
 849 #endif
 850       _mesa_debug(ctx, "spec %g %g %g %g\n",
 851                   v->attrib[FRAG_ATTRIB_COL1][0],
 852                   v->attrib[FRAG_ATTRIB_COL1][1],
 853                   v->attrib[FRAG_ATTRIB_COL1][2],
 854                   v->attrib[FRAG_ATTRIB_COL1][3]);
 855       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 856       _mesa_debug(ctx, "index %f\n", v->attrib[FRAG_ATTRIB_CI][0]);
 857       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 858       _mesa_debug(ctx, "\n");
 859    }
 860 }