src/mesa/swrast/s_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keithw@vmware.com> Brian Paul
  26  */
  27
  28 #include "main/imports.h"
  29 #include "main/bufferobj.h"
  30 #include "main/colormac.h"
  31 #include "main/mtypes.h"
  32 #include "main/samplerobj.h"
  33 #include "main/teximage.h"
  34 #include "program/prog_parameter.h"
  35 #include "program/prog_statevars.h"
  36 #include "swrast.h"
  37 #include "s_blend.h"
  38 #include "s_context.h"
  39 #include "s_lines.h"
  40 #include "s_points.h"
  41 #include "s_span.h"
  42 #include "s_texfetch.h"
  43 #include "s_triangle.h"
  44 #include "s_texfilter.h"
  45
  46
  47 /**
  48  * Recompute the value of swrast->_RasterMask, etc. according to
  49  * the current context.  The _RasterMask field can be easily tested by
  50  * drivers to determine certain basic GL state (does the primitive need
  51  * stenciling, logic-op, fog, etc?).
  52  */
  53 static void
  54 _swrast_update_rasterflags( struct gl_context *ctx )
  55 {
  56    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  57    GLbitfield rasterMask = 0;
  58    GLuint i;
  59
  60    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  61    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  62    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  63    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  64    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  65    if (ctx->Stencil._Enabled)             rasterMask |= STENCIL_BIT;
  66    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  67       if (!ctx->Color.ColorMask[i][0] ||
  68           !ctx->Color.ColorMask[i][1] ||
  69           !ctx->Color.ColorMask[i][2] ||
  70           !ctx->Color.ColorMask[i][3]) {
  71          rasterMask |= MASKING_BIT;
  72          break;
  73       }
  74    }
  75    if (ctx->Color.ColorLogicOpEnabled) rasterMask |= LOGIC_OP_BIT;
  76    if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  77    if (   ctx->Viewport.X < 0
  78        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  79        || ctx->Viewport.Y < 0
  80        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  81       rasterMask |= CLIP_BIT;
  82    }
  83
  84    if (ctx->Query.CurrentOcclusionObject)
  85       rasterMask |= OCCLUSION_BIT;
  86
  87
  88    /* If we're not drawing to exactly one color buffer set the
  89     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  90     * buffers or the RGBA or CI mask disables all writes.
  91     */
  92    if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
  93       /* more than one color buffer designated for writing (or zero buffers) */
  94       rasterMask |= MULTI_DRAW_BIT;
  95    }
  96
  97    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  98       if (ctx->Color.ColorMask[i][0] +
  99           ctx->Color.ColorMask[i][1] +
 100           ctx->Color.ColorMask[i][2] +
 101           ctx->Color.ColorMask[i][3] == 0) {
 102          rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 103          break;
 104       }
 105    }
 106
 107
 108    if (_swrast_use_fragment_program(ctx)) {
 109       rasterMask |= FRAGPROG_BIT;
 110    }
 111
 112    if (ctx->ATIFragmentShader._Enabled) {
 113       rasterMask |= ATIFRAGSHADER_BIT;
 114    }
 115
 116 #if CHAN_TYPE == GL_FLOAT
 117    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 118       rasterMask |= CLAMPING_BIT;
 119    }
 120 #endif
 121
 122    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 123 }
 124
 125
 126 /**
 127  * Examine polygon cull state to compute the _BackfaceCullSign field.
 128  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 129  * and 1 if culling front-faces.  The Polygon FrontFace state also
 130  * factors in.
 131  */
 132 static void
 133 _swrast_update_polygon( struct gl_context *ctx )
 134 {
 135    GLfloat backface_sign;
 136
 137    if (ctx->Polygon.CullFlag) {
 138       switch (ctx->Polygon.CullFaceMode) {
 139       case GL_BACK:
 140          backface_sign = -1.0F;
 141          break;
 142       case GL_FRONT:
 143          backface_sign = 1.0F;
 144          break;
 145       case GL_FRONT_AND_BACK:
 146          /* fallthrough */
 147       default:
 148          backface_sign = 0.0F;
 149       }
 150    }
 151    else {
 152       backface_sign = 0.0F;
 153    }
 154
 155    SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
 156
 157    /* This is for front/back-face determination, but not for culling */
 158    SWRAST_CONTEXT(ctx)->_BackfaceSign
 159       = (ctx->Polygon.FrontFace == GL_CW) ? -1.0F : 1.0F;
 160 }
 161
 162
 163
 164 /**
 165  * Update the _PreferPixelFog field to indicate if we need to compute
 166  * fog blend factors (from the fog coords) per-fragment.
 167  */
 168 static void
 169 _swrast_update_fog_hint( struct gl_context *ctx )
 170 {
 171    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 172    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 173                               _swrast_use_fragment_program(ctx) ||
 174                               (ctx->Hint.Fog == GL_NICEST &&
 175                                swrast->AllowPixelFog));
 176 }
 177
 178
 179
 180 /**
 181  * Update the swrast->_TextureCombinePrimary flag.
 182  */
 183 static void
 184 _swrast_update_texture_env( struct gl_context *ctx )
 185 {
 186    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 187    GLuint i;
 188
 189    swrast->_TextureCombinePrimary = GL_FALSE;
 190
 191    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 192       const struct gl_tex_env_combine_state *combine =
 193          ctx->Texture.Unit[i]._CurrentCombine;
 194       GLuint term;
 195       for (term = 0; term < combine->_NumArgsRGB; term++) {
 196          if (combine->SourceRGB[term] == GL_PRIMARY_COLOR) {
 197             swrast->_TextureCombinePrimary = GL_TRUE;
 198             return;
 199          }
 200          if (combine->SourceA[term] == GL_PRIMARY_COLOR) {
 201             swrast->_TextureCombinePrimary = GL_TRUE;
 202             return;
 203          }
 204       }
 205    }
 206 }
 207
 208
 209 /**
 210  * Determine if we can defer texturing/shading until after Z/stencil
 211  * testing.  This potentially allows us to skip texturing/shading for
 212  * lots of fragments.
 213  */
 214 static void
 215 _swrast_update_deferred_texture(struct gl_context *ctx)
 216 {
 217    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 218    if (ctx->Color.AlphaEnabled) {
 219       /* alpha test depends on post-texture/shader colors */
 220       swrast->_DeferredTexture = GL_FALSE;
 221    }
 222    else {
 223       GLboolean use_fprog = _swrast_use_fragment_program(ctx);
 224       const struct gl_fragment_program *fprog
 225          = ctx->FragmentProgram._Current;
 226       if (use_fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
 227          /* Z comes from fragment program/shader */
 228          swrast->_DeferredTexture = GL_FALSE;
 229       }
 230       else if (use_fprog && fprog->UsesKill) {
 231          swrast->_DeferredTexture = GL_FALSE;
 232       }
 233       else if (ctx->Query.CurrentOcclusionObject) {
 234          /* occlusion query depends on shader discard/kill results */
 235          swrast->_DeferredTexture = GL_FALSE;
 236       }
 237       else {
 238          swrast->_DeferredTexture = GL_TRUE;
 239       }
 240    }
 241 }
 242
 243
 244 /**
 245  * Update swrast->_FogColor and swrast->_FogEnable values.
 246  */
 247 static void
 248 _swrast_update_fog_state( struct gl_context *ctx )
 249 {
 250    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 251    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 252
 253    assert(fp == NULL || fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB);
 254
 255    /* determine if fog is needed, and if so, which fog mode */
 256    swrast->_FogEnabled = (!_swrast_use_fragment_program(ctx) &&
 257                           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    if (!_swrast_use_fragment_program(ctx))
 269       return;
 270
 271    _mesa_load_state_parameters(ctx,
 272                                ctx->FragmentProgram._Current->Base.Parameters);
 273 }
 274
 275
 276 /**
 277  * See if we can do early diffuse+specular (primary+secondary) color
 278  * add per vertex instead of per-fragment.
 279  */
 280 static void
 281 _swrast_update_specular_vertex_add(struct gl_context *ctx)
 282 {
 283    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 284    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 285       (ctx->Light.Enabled &&
 286        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 287
 288    swrast->SpecularVertexAdd = (separateSpecular
 289                                 && ctx->Texture._EnabledUnits == 0x0
 290                                 && !_swrast_use_fragment_program(ctx)
 291                                 && !ctx->ATIFragmentShader._Enabled);
 292 }
 293
 294
 295 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 296                              _NEW_PROGRAM_CONSTANTS |   \
 297                              _NEW_TEXTURE |             \
 298                              _NEW_HINT |                \
 299                              _NEW_POLYGON )
 300
 301 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 302  */
 303 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 304                               _NEW_RENDERMODE|                  \
 305                               _NEW_POLYGON|                     \
 306                               _NEW_DEPTH|                       \
 307                               _NEW_STENCIL|                     \
 308                               _NEW_COLOR|                       \
 309                               _NEW_TEXTURE|                     \
 310                               _SWRAST_NEW_RASTERMASK|           \
 311                               _NEW_LIGHT|                       \
 312                               _NEW_FOG |                        \
 313                               _MESA_NEW_SEPARATE_SPECULAR)
 314
 315 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 316                           _NEW_RENDERMODE|              \
 317                           _NEW_LINE|                    \
 318                           _NEW_TEXTURE|                 \
 319                           _NEW_LIGHT|                   \
 320                           _NEW_FOG|                     \
 321                           _NEW_DEPTH |                  \
 322                           _MESA_NEW_SEPARATE_SPECULAR)
 323
 324 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 325                            _NEW_RENDERMODE |            \
 326                            _NEW_POINT |                 \
 327                            _NEW_TEXTURE |               \
 328                            _NEW_LIGHT |                 \
 329                            _NEW_FOG |                   \
 330                            _MESA_NEW_SEPARATE_SPECULAR)
 331
 332 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 333
 334 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 335
 336 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 337
 338
 339
 340 /**
 341  * Stub for swrast->Triangle to select a true triangle function
 342  * after a state change.
 343  */
 344 static void
 345 _swrast_validate_triangle( struct gl_context *ctx,
 346                            const SWvertex *v0,
 347                            const SWvertex *v1,
 348                            const SWvertex *v2 )
 349 {
 350    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 351
 352    _swrast_validate_derived( ctx );
 353    swrast->choose_triangle( ctx );
 354    ASSERT(swrast->Triangle);
 355
 356    if (swrast->SpecularVertexAdd) {
 357       /* separate specular color, but no texture */
 358       swrast->SpecTriangle = swrast->Triangle;
 359       swrast->Triangle = _swrast_add_spec_terms_triangle;
 360    }
 361
 362    swrast->Triangle( ctx, v0, v1, v2 );
 363 }
 364
 365 /**
 366  * Called via swrast->Line.  Examine current GL state and choose a software
 367  * line routine.  Then call it.
 368  */
 369 static void
 370 _swrast_validate_line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 371 {
 372    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 373
 374    _swrast_validate_derived( ctx );
 375    swrast->choose_line( ctx );
 376    ASSERT(swrast->Line);
 377
 378    if (swrast->SpecularVertexAdd) {
 379       swrast->SpecLine = swrast->Line;
 380       swrast->Line = _swrast_add_spec_terms_line;
 381    }
 382
 383    swrast->Line( ctx, v0, v1 );
 384 }
 385
 386 /**
 387  * Called via swrast->Point.  Examine current GL state and choose a software
 388  * point routine.  Then call it.
 389  */
 390 static void
 391 _swrast_validate_point( struct gl_context *ctx, const SWvertex *v0 )
 392 {
 393    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 394
 395    _swrast_validate_derived( ctx );
 396    swrast->choose_point( ctx );
 397
 398    if (swrast->SpecularVertexAdd) {
 399       swrast->SpecPoint = swrast->Point;
 400       swrast->Point = _swrast_add_spec_terms_point;
 401    }
 402
 403    swrast->Point( ctx, v0 );
 404 }
 405
 406
 407 /**
 408  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 409  * function, then call it.
 410  */
 411 static void _ASMAPI
 412 _swrast_validate_blend_func(struct gl_context *ctx, GLuint n, const GLubyte mask[],
 413                             GLvoid *src, const GLvoid *dst,
 414                             GLenum chanType )
 415 {
 416    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 417
 418    _swrast_validate_derived( ctx ); /* why is this needed? */
 419    _swrast_choose_blend_func( ctx, chanType );
 420
 421    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 422 }
 423
 424 static void
 425 _swrast_sleep( struct gl_context *ctx, GLbitfield new_state )
 426 {
 427    (void) ctx; (void) new_state;
 428 }
 429
 430
 431 static void
 432 _swrast_invalidate_state( struct gl_context *ctx, GLbitfield new_state )
 433 {
 434    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 435    GLuint i;
 436
 437    swrast->NewState |= new_state;
 438
 439    /* After 10 statechanges without any swrast functions being called,
 440     * put the module to sleep.
 441     */
 442    if (++swrast->StateChanges > 10) {
 443       swrast->InvalidateState = _swrast_sleep;
 444       swrast->NewState = ~0;
 445       new_state = ~0;
 446    }
 447
 448    if (new_state & swrast->InvalidateTriangleMask)
 449       swrast->Triangle = _swrast_validate_triangle;
 450
 451    if (new_state & swrast->InvalidateLineMask)
 452       swrast->Line = _swrast_validate_line;
 453
 454    if (new_state & swrast->InvalidatePointMask)
 455       swrast->Point = _swrast_validate_point;
 456
 457    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 458       swrast->BlendFunc = _swrast_validate_blend_func;
 459
 460    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 461       for (i = 0 ; i < ARRAY_SIZE(swrast->TextureSample); i++)
 462          swrast->TextureSample[i] = NULL;
 463 }
 464
 465
 466 void
 467 _swrast_update_texture_samplers(struct gl_context *ctx)
 468 {
 469    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 470    GLuint u;
 471
 472    if (!swrast)
 473       return; /* pipe hack */
 474
 475    for (u = 0; u < ARRAY_SIZE(swrast->TextureSample); u++) {
 476       struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 477       /* Note: If tObj is NULL, the sample function will be a simple
 478        * function that just returns opaque black (0,0,0,1).
 479        */
 480       _mesa_update_fetch_functions(ctx, u);
 481       swrast->TextureSample[u] =
 482          _swrast_choose_texture_sample_func(ctx, tObj,
 483                                             _mesa_get_samplerobj(ctx, u));
 484    }
 485 }
 486
 487
 488 /**
 489  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 490  * swrast->_ActiveAtttribMask.
 491  */
 492 static void
 493 _swrast_update_active_attribs(struct gl_context *ctx)
 494 {
 495    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 496    GLbitfield64 attribsMask;
 497
 498    /*
 499     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 500     */
 501    if (_swrast_use_fragment_program(ctx)) {
 502       /* fragment program/shader */
 503       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 504       attribsMask &= ~VARYING_BIT_POS; /* WPOS is always handled specially */
 505    }
 506    else if (ctx->ATIFragmentShader._Enabled) {
 507       attribsMask = ~0;  /* XXX fix me */
 508    }
 509    else {
 510       /* fixed function */
 511       attribsMask = 0x0;
 512
 513 #if CHAN_TYPE == GL_FLOAT
 514       attribsMask |= VARYING_BIT_COL0;
 515 #endif
 516
 517       if (ctx->Fog.ColorSumEnabled ||
 518           (ctx->Light.Enabled &&
 519            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 520          attribsMask |= VARYING_BIT_COL1;
 521       }
 522
 523       if (swrast->_FogEnabled)
 524          attribsMask |= VARYING_BIT_FOGC;
 525
 526       attribsMask |= (ctx->Texture._EnabledUnits << VARYING_SLOT_TEX0);
 527    }
 528
 529    swrast->_ActiveAttribMask = attribsMask;
 530
 531    /* Update _ActiveAttribs[] list */
 532    {
 533       GLuint i, num = 0;
 534       for (i = 0; i < VARYING_SLOT_MAX; i++) {
 535          if (attribsMask & BITFIELD64_BIT(i)) {
 536             swrast->_ActiveAttribs[num++] = i;
 537             /* how should this attribute be interpolated? */
 538             if (i == VARYING_SLOT_COL0 || i == VARYING_SLOT_COL1)
 539                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 540             else
 541                swrast->_InterpMode[i] = GL_SMOOTH;
 542          }
 543       }
 544       swrast->_NumActiveAttribs = num;
 545    }
 546 }
 547
 548
 549 void
 550 _swrast_validate_derived( struct gl_context *ctx )
 551 {
 552    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 553
 554    if (swrast->NewState) {
 555       if (swrast->NewState & _NEW_POLYGON)
 556          _swrast_update_polygon( ctx );
 557
 558       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 559          _swrast_update_fog_hint( ctx );
 560
 561       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 562          _swrast_update_texture_env( ctx );
 563
 564       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 565          _swrast_update_fog_state( ctx );
 566
 567       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 568          _swrast_update_fragment_program( ctx, swrast->NewState );
 569
 570       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 571          _swrast_update_texture_samplers( ctx );
 572       }
 573
 574       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 575          _swrast_update_deferred_texture(ctx);
 576
 577       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 578          _swrast_update_rasterflags( ctx );
 579
 580       if (swrast->NewState & (_NEW_DEPTH |
 581                               _NEW_FOG |
 582                               _NEW_LIGHT |
 583                               _NEW_PROGRAM |
 584                               _NEW_TEXTURE))
 585          _swrast_update_active_attribs(ctx);
 586
 587       if (swrast->NewState & (_NEW_FOG |
 588                               _NEW_PROGRAM |
 589                               _NEW_LIGHT |
 590                               _NEW_TEXTURE))
 591          _swrast_update_specular_vertex_add(ctx);
 592
 593       swrast->NewState = 0;
 594       swrast->StateChanges = 0;
 595       swrast->InvalidateState = _swrast_invalidate_state;
 596    }
 597 }
 598
 599 #define SWRAST_DEBUG 0
 600
 601 /* Public entrypoints:  See also s_bitmap.c, etc.
 602  */
 603 void
 604 _swrast_Quad( struct gl_context *ctx,
 605               const SWvertex *v0, const SWvertex *v1,
 606               const SWvertex *v2, const SWvertex *v3 )
 607 {
 608    if (SWRAST_DEBUG) {
 609       _mesa_debug(ctx, "_swrast_Quad\n");
 610       _swrast_print_vertex( ctx, v0 );
 611       _swrast_print_vertex( ctx, v1 );
 612       _swrast_print_vertex( ctx, v2 );
 613       _swrast_print_vertex( ctx, v3 );
 614    }
 615    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 616    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 617 }
 618
 619 void
 620 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 621                   const SWvertex *v1, const SWvertex *v2 )
 622 {
 623    if (SWRAST_DEBUG) {
 624       _mesa_debug(ctx, "_swrast_Triangle\n");
 625       _swrast_print_vertex( ctx, v0 );
 626       _swrast_print_vertex( ctx, v1 );
 627       _swrast_print_vertex( ctx, v2 );
 628    }
 629    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 630 }
 631
 632 void
 633 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 634 {
 635    if (SWRAST_DEBUG) {
 636       _mesa_debug(ctx, "_swrast_Line\n");
 637       _swrast_print_vertex( ctx, v0 );
 638       _swrast_print_vertex( ctx, v1 );
 639    }
 640    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 641 }
 642
 643 void
 644 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 645 {
 646    if (SWRAST_DEBUG) {
 647       _mesa_debug(ctx, "_swrast_Point\n");
 648       _swrast_print_vertex( ctx, v0 );
 649    }
 650    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 651 }
 652
 653 void
 654 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 655 {
 656    if (SWRAST_DEBUG) {
 657       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 658    }
 659    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 660 }
 661
 662 void
 663 _swrast_ResetLineStipple( struct gl_context *ctx )
 664 {
 665    if (SWRAST_DEBUG) {
 666       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 667    }
 668    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 669 }
 670
 671 void
 672 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 673 {
 674    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 675 }
 676
 677 void
 678 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 679 {
 680    if (SWRAST_DEBUG) {
 681       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 682    }
 683    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 684    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 685 }
 686
 687 void
 688 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 689 {
 690    if (SWRAST_DEBUG) {
 691       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 692    }
 693    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 694    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 695 }
 696
 697
 698 /**
 699  * Initialize native program limits by copying the logical limits.
 700  * See comments in init_program_limits() in context.c
 701  */
 702 static void
 703 init_program_native_limits(struct gl_program_constants *prog)
 704 {
 705    prog->MaxNativeInstructions = prog->MaxInstructions;
 706    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 707    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 708    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 709    prog->MaxNativeAttribs = prog->MaxAttribs;
 710    prog->MaxNativeTemps = prog->MaxTemps;
 711    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 712    prog->MaxNativeParameters = prog->MaxParameters;
 713 }
 714
 715
 716 GLboolean
 717 _swrast_CreateContext( struct gl_context *ctx )
 718 {
 719    GLuint i;
 720    SWcontext *swrast = calloc(1, sizeof(SWcontext));
 721 #ifdef _OPENMP
 722    const GLuint maxThreads = omp_get_max_threads();
 723 #else
 724    const GLuint maxThreads = 1;
 725 #endif
 726
 727    assert(ctx->Const.MaxViewportWidth <= SWRAST_MAX_WIDTH);
 728    assert(ctx->Const.MaxViewportHeight <= SWRAST_MAX_WIDTH);
 729
 730    assert(ctx->Const.MaxRenderbufferSize <= SWRAST_MAX_WIDTH);
 731
 732    /* make sure largest texture image is <= SWRAST_MAX_WIDTH in size */
 733    assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 734    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 735    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 736
 737    assert(PROG_MAX_WIDTH == SWRAST_MAX_WIDTH);
 738
 739    if (SWRAST_DEBUG) {
 740       _mesa_debug(ctx, "_swrast_CreateContext\n");
 741    }
 742
 743    if (!swrast)
 744       return GL_FALSE;
 745
 746    swrast->NewState = ~0;
 747
 748    swrast->choose_point = _swrast_choose_point;
 749    swrast->choose_line = _swrast_choose_line;
 750    swrast->choose_triangle = _swrast_choose_triangle;
 751
 752    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 753    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 754    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 755
 756    swrast->Point = _swrast_validate_point;
 757    swrast->Line = _swrast_validate_line;
 758    swrast->Triangle = _swrast_validate_triangle;
 759    swrast->InvalidateState = _swrast_sleep;
 760    swrast->BlendFunc = _swrast_validate_blend_func;
 761
 762    swrast->AllowVertexFog = GL_TRUE;
 763    swrast->AllowPixelFog = GL_TRUE;
 764
 765    swrast->Driver.SpanRenderStart = _swrast_span_render_start;
 766    swrast->Driver.SpanRenderFinish = _swrast_span_render_finish;
 767
 768    for (i = 0; i < ARRAY_SIZE(swrast->TextureSample); i++)
 769       swrast->TextureSample[i] = NULL;
 770
 771    /* SpanArrays is global and shared by all SWspan instances. However, when
 772     * using multiple threads, it is necessary to have one SpanArrays instance
 773     * per thread.
 774     */
 775    swrast->SpanArrays = malloc(maxThreads * sizeof(SWspanarrays));
 776    if (!swrast->SpanArrays) {
 777       free(swrast);
 778       return GL_FALSE;
 779    }
 780    for(i = 0; i < maxThreads; i++) {
 781       swrast->SpanArrays[i].ChanType = CHAN_TYPE;
 782 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 783       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba8;
 784 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 785       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba16;
 786 #else
 787       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].attribs[VARYING_SLOT_COL0];
 788 #endif
 789    }
 790
 791    /* init point span buffer */
 792    swrast->PointSpan.primitive = GL_POINT;
 793    swrast->PointSpan.end = 0;
 794    swrast->PointSpan.facing = 0;
 795    swrast->PointSpan.array = swrast->SpanArrays;
 796
 797    init_program_native_limits(&ctx->Const.Program[MESA_SHADER_VERTEX]);
 798    init_program_native_limits(&ctx->Const.Program[MESA_SHADER_GEOMETRY]);
 799    init_program_native_limits(&ctx->Const.Program[MESA_SHADER_FRAGMENT]);
 800
 801    ctx->swrast_context = swrast;
 802
 803    swrast->stencil_temp.buf1 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 804    swrast->stencil_temp.buf2 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 805    swrast->stencil_temp.buf3 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 806    swrast->stencil_temp.buf4 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 807
 808    if (!swrast->stencil_temp.buf1 ||
 809        !swrast->stencil_temp.buf2 ||
 810        !swrast->stencil_temp.buf3 ||
 811        !swrast->stencil_temp.buf4) {
 812       _swrast_DestroyContext(ctx);
 813       return GL_FALSE;
 814    }
 815
 816    return GL_TRUE;
 817 }
 818
 819 void
 820 _swrast_DestroyContext( struct gl_context *ctx )
 821 {
 822    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 823
 824    if (SWRAST_DEBUG) {
 825       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 826    }
 827
 828    free( swrast->SpanArrays );
 829    free( swrast->ZoomedArrays );
 830    free( swrast->TexelBuffer );
 831
 832    free(swrast->stencil_temp.buf1);
 833    free(swrast->stencil_temp.buf2);
 834    free(swrast->stencil_temp.buf3);
 835    free(swrast->stencil_temp.buf4);
 836
 837    free( swrast );
 838
 839    ctx->swrast_context = 0;
 840 }
 841
 842
 843 struct swrast_device_driver *
 844 _swrast_GetDeviceDriverReference( struct gl_context *ctx )
 845 {
 846    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 847    return &swrast->Driver;
 848 }
 849
 850 void
 851 _swrast_flush( struct gl_context *ctx )
 852 {
 853    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 854    /* flush any pending fragments from rendering points */
 855    if (swrast->PointSpan.end > 0) {
 856       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 857       swrast->PointSpan.end = 0;
 858    }
 859 }
 860
 861 void
 862 _swrast_render_primitive( struct gl_context *ctx, GLenum prim )
 863 {
 864    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 865    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 866       _swrast_flush(ctx);
 867    }
 868    swrast->Primitive = prim;
 869 }
 870
 871
 872 /** called via swrast->Driver.SpanRenderStart() */
 873 void
 874 _swrast_span_render_start(struct gl_context *ctx)
 875 {
 876    _swrast_map_textures(ctx);
 877    _swrast_map_renderbuffers(ctx);
 878 }
 879
 880
 881 /** called via swrast->Driver.SpanRenderFinish() */
 882 void
 883 _swrast_span_render_finish(struct gl_context *ctx)
 884 {
 885    _swrast_unmap_textures(ctx);
 886    _swrast_unmap_renderbuffers(ctx);
 887 }
 888
 889
 890 void
 891 _swrast_render_start( struct gl_context *ctx )
 892 {
 893    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 894    if (swrast->Driver.SpanRenderStart)
 895       swrast->Driver.SpanRenderStart( ctx );
 896    swrast->PointSpan.end = 0;
 897 }
 898
 899 void
 900 _swrast_render_finish( struct gl_context *ctx )
 901 {
 902    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 903
 904    _swrast_flush(ctx);
 905
 906    if (swrast->Driver.SpanRenderFinish)
 907       swrast->Driver.SpanRenderFinish( ctx );
 908 }
 909
 910
 911 #define SWRAST_DEBUG_VERTICES 0
 912
 913 void
 914 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 915 {
 916    GLuint i;
 917
 918    if (SWRAST_DEBUG_VERTICES) {
 919       _mesa_debug(ctx, "win %f %f %f %f\n",
 920                   v->attrib[VARYING_SLOT_POS][0],
 921                   v->attrib[VARYING_SLOT_POS][1],
 922                   v->attrib[VARYING_SLOT_POS][2],
 923                   v->attrib[VARYING_SLOT_POS][3]);
 924
 925       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 926          if (ctx->Texture.Unit[i]._ReallyEnabled)
 927             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 928                         v->attrib[VARYING_SLOT_TEX0 + i][0],
 929                         v->attrib[VARYING_SLOT_TEX0 + i][1],
 930                         v->attrib[VARYING_SLOT_TEX0 + i][2],
 931                         v->attrib[VARYING_SLOT_TEX0 + i][3]);
 932
 933 #if CHAN_TYPE == GL_FLOAT
 934       _mesa_debug(ctx, "color %f %f %f %f\n",
 935                   v->color[0], v->color[1], v->color[2], v->color[3]);
 936 #else
 937       _mesa_debug(ctx, "color %d %d %d %d\n",
 938                   v->color[0], v->color[1], v->color[2], v->color[3]);
 939 #endif
 940       _mesa_debug(ctx, "spec %g %g %g %g\n",
 941                   v->attrib[VARYING_SLOT_COL1][0],
 942                   v->attrib[VARYING_SLOT_COL1][1],
 943                   v->attrib[VARYING_SLOT_COL1][2],
 944                   v->attrib[VARYING_SLOT_COL1][3]);
 945       _mesa_debug(ctx, "fog %f\n", v->attrib[VARYING_SLOT_FOGC][0]);
 946       _mesa_debug(ctx, "index %f\n", v->attrib[VARYING_SLOT_CI][0]);
 947       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 948       _mesa_debug(ctx, "\n");
 949    }
 950 }