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_depthstencil.h"
  40 #include "s_lines.h"
  41 #include "s_points.h"
  42 #include "s_span.h"
  43 #include "s_texfetch.h"
  44 #include "s_triangle.h"
  45 #include "s_texfilter.h"
  46
  47
  48 /**
  49  * Recompute the value of swrast->_RasterMask, etc. according to
  50  * the current context.  The _RasterMask field can be easily tested by
  51  * drivers to determine certain basic GL state (does the primitive need
  52  * stenciling, logic-op, fog, etc?).
  53  */
  54 static void
  55 _swrast_update_rasterflags( struct gl_context *ctx )
  56 {
  57    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  58    GLbitfield rasterMask = 0;
  59    GLuint i;
  60
  61    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  62    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  63    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  64    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  65    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  66    if (ctx->Stencil._Enabled)             rasterMask |= STENCIL_BIT;
  67    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  68       if (!ctx->Color.ColorMask[i][0] ||
  69           !ctx->Color.ColorMask[i][1] ||
  70           !ctx->Color.ColorMask[i][2] ||
  71           !ctx->Color.ColorMask[i][3]) {
  72          rasterMask |= MASKING_BIT;
  73          break;
  74       }
  75    }
  76    if (ctx->Color.ColorLogicOpEnabled) rasterMask |= LOGIC_OP_BIT;
  77    if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  78    if (   ctx->Viewport.X < 0
  79        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  80        || ctx->Viewport.Y < 0
  81        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  82       rasterMask |= CLIP_BIT;
  83    }
  84
  85    if (ctx->Query.CurrentOcclusionObject)
  86       rasterMask |= OCCLUSION_BIT;
  87
  88
  89    /* If we're not drawing to exactly one color buffer set the
  90     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  91     * buffers or the RGBA or CI mask disables all writes.
  92     */
  93    if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
  94       /* more than one color buffer designated for writing (or zero buffers) */
  95       rasterMask |= MULTI_DRAW_BIT;
  96    }
  97
  98    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  99       if (ctx->Color.ColorMask[i][0] +
 100           ctx->Color.ColorMask[i][1] +
 101           ctx->Color.ColorMask[i][2] +
 102           ctx->Color.ColorMask[i][3] == 0) {
 103          rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 104          break;
 105       }
 106    }
 107
 108
 109    if (ctx->FragmentProgram._Current) {
 110       rasterMask |= FRAGPROG_BIT;
 111    }
 112
 113    if (ctx->ATIFragmentShader._Enabled) {
 114       rasterMask |= ATIFRAGSHADER_BIT;
 115    }
 116
 117 #if CHAN_TYPE == GL_FLOAT
 118    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 119       rasterMask |= CLAMPING_BIT;
 120    }
 121 #endif
 122
 123    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 124 }
 125
 126
 127 /**
 128  * Examine polygon cull state to compute the _BackfaceCullSign field.
 129  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 130  * and 1 if culling front-faces.  The Polygon FrontFace state also
 131  * factors in.
 132  */
 133 static void
 134 _swrast_update_polygon( struct gl_context *ctx )
 135 {
 136    GLfloat backface_sign;
 137
 138    if (ctx->Polygon.CullFlag) {
 139       switch (ctx->Polygon.CullFaceMode) {
 140       case GL_BACK:
 141          backface_sign = -1.0F;
 142          break;
 143       case GL_FRONT:
 144          backface_sign = 1.0F;
 145          break;
 146       case GL_FRONT_AND_BACK:
 147          /* fallthrough */
 148       default:
 149          backface_sign = 0.0F;
 150       }
 151    }
 152    else {
 153       backface_sign = 0.0F;
 154    }
 155
 156    SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
 157
 158    /* This is for front/back-face determination, but not for culling */
 159    SWRAST_CONTEXT(ctx)->_BackfaceSign
 160       = (ctx->Polygon.FrontFace == GL_CW) ? -1.0F : 1.0F;
 161 }
 162
 163
 164
 165 /**
 166  * Update the _PreferPixelFog field to indicate if we need to compute
 167  * fog blend factors (from the fog coords) per-fragment.
 168  */
 169 static void
 170 _swrast_update_fog_hint( struct gl_context *ctx )
 171 {
 172    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 173    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 174                               ctx->FragmentProgram._Current ||
 175                               (ctx->Hint.Fog == GL_NICEST &&
 176                                swrast->AllowPixelFog));
 177 }
 178
 179
 180
 181 /**
 182  * Update the swrast->_TextureCombinePrimary flag.
 183  */
 184 static void
 185 _swrast_update_texture_env( struct gl_context *ctx )
 186 {
 187    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 188    GLuint i;
 189
 190    swrast->_TextureCombinePrimary = GL_FALSE;
 191
 192    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 193       const struct gl_tex_env_combine_state *combine =
 194          ctx->Texture.Unit[i]._CurrentCombine;
 195       GLuint term;
 196       for (term = 0; term < combine->_NumArgsRGB; term++) {
 197          if (combine->SourceRGB[term] == GL_PRIMARY_COLOR) {
 198             swrast->_TextureCombinePrimary = GL_TRUE;
 199             return;
 200          }
 201          if (combine->SourceA[term] == GL_PRIMARY_COLOR) {
 202             swrast->_TextureCombinePrimary = GL_TRUE;
 203             return;
 204          }
 205       }
 206    }
 207 }
 208
 209
 210 /**
 211  * Determine if we can defer texturing/shading until after Z/stencil
 212  * testing.  This potentially allows us to skip texturing/shading for
 213  * lots of fragments.
 214  */
 215 static void
 216 _swrast_update_deferred_texture(struct gl_context *ctx)
 217 {
 218    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 219    if (ctx->Color.AlphaEnabled) {
 220       /* alpha test depends on post-texture/shader colors */
 221       swrast->_DeferredTexture = GL_FALSE;
 222    }
 223    else {
 224       const struct gl_fragment_program *fprog
 225          = ctx->FragmentProgram._Current;
 226       if (fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
 227          /* Z comes from fragment program/shader */
 228          swrast->_DeferredTexture = GL_FALSE;
 229       }
 230       else if (fprog && fprog->UsesKill) {
 231          swrast->_DeferredTexture = GL_FALSE;
 232       }
 233       else if (ctx->Query.CurrentOcclusionObject) {
 234          /* occlusion query depends on shader discard/kill results */
 235          swrast->_DeferredTexture = GL_FALSE;
 236       }
 237       else {
 238          swrast->_DeferredTexture = GL_TRUE;
 239       }
 240    }
 241 }
 242
 243
 244 /**
 245  * Update swrast->_FogColor and swrast->_FogEnable values.
 246  */
 247 static void
 248 _swrast_update_fog_state( struct gl_context *ctx )
 249 {
 250    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 251    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 252
 253    assert((fp == NULL) ||
 254           (fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) ||
 255           (fp->Base.Target == GL_FRAGMENT_PROGRAM_NV));
 256
 257    /* determine if fog is needed, and if so, which fog mode */
 258    swrast->_FogEnabled = (fp == NULL && ctx->Fog.Enabled);
 259 }
 260
 261
 262 /**
 263  * Update state for running fragment programs.  Basically, load the
 264  * program parameters with current state values.
 265  */
 266 static void
 267 _swrast_update_fragment_program(struct gl_context *ctx, GLbitfield newState)
 268 {
 269    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 270    if (fp) {
 271       _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 272    }
 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                                 && !ctx->FragmentProgram._Current
 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                               _DD_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                           _DD_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                            _DD_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 < ctx->Const.MaxTextureImageUnits ; 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 < ctx->Const.MaxTextureImageUnits; 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       if (tObj) {
 481          _mesa_update_fetch_functions(tObj);
 482       }
 483       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 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    GLuint attribsMask;
 497
 498    /*
 499     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 500     */
 501    if (ctx->FragmentProgram._Current) {
 502       /* fragment program/shader */
 503       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 504       attribsMask &= ~FRAG_BIT_WPOS; /* 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 |= FRAG_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 |= FRAG_BIT_COL1;
 521       }
 522
 523       if (swrast->_FogEnabled)
 524          attribsMask |= FRAG_BIT_FOGC;
 525
 526       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 527    }
 528
 529    swrast->_ActiveAttribMask = attribsMask;
 530
 531    /* Update _ActiveAttribs[] list */
 532    {
 533       GLuint i, num = 0;
 534       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 535          if (attribsMask & (1 << i)) {
 536             swrast->_ActiveAttribs[num++] = i;
 537             /* how should this attribute be interpolated? */
 538             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_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 /**
 550  * Update the depth/stencil renderbuffers, if needed.
 551  */
 552 static void
 553 _swrast_update_depth_stencil(struct gl_context *ctx)
 554 {
 555    struct gl_framebuffer *drawFb = ctx->DrawBuffer;
 556    struct gl_framebuffer *readFb = ctx->ReadBuffer;
 557
 558    _swrast_update_depth_buffer(ctx, drawFb);
 559    _swrast_update_stencil_buffer(ctx, drawFb);
 560
 561    if (readFb != drawFb) {
 562       _swrast_update_depth_buffer(ctx, readFb);
 563       _swrast_update_stencil_buffer(ctx, readFb);
 564    }
 565 }
 566
 567
 568 void
 569 _swrast_validate_derived( struct gl_context *ctx )
 570 {
 571    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 572
 573    if (swrast->NewState) {
 574       if (swrast->NewState & _NEW_POLYGON)
 575          _swrast_update_polygon( ctx );
 576
 577       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 578          _swrast_update_fog_hint( ctx );
 579
 580       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 581          _swrast_update_texture_env( ctx );
 582
 583       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 584          _swrast_update_fog_state( ctx );
 585
 586       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 587          _swrast_update_fragment_program( ctx, swrast->NewState );
 588
 589       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 590          _swrast_update_texture_samplers( ctx );
 591       }
 592
 593       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 594          _swrast_update_deferred_texture(ctx);
 595
 596       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 597          _swrast_update_rasterflags( ctx );
 598
 599       if (swrast->NewState & (_NEW_DEPTH |
 600                               _NEW_FOG |
 601                               _NEW_LIGHT |
 602                               _NEW_PROGRAM |
 603                               _NEW_TEXTURE))
 604          _swrast_update_active_attribs(ctx);
 605
 606       if (swrast->NewState & (_NEW_FOG |
 607                               _NEW_PROGRAM |
 608                               _NEW_LIGHT |
 609                               _NEW_TEXTURE))
 610          _swrast_update_specular_vertex_add(ctx);
 611
 612       if (swrast->NewState & _NEW_BUFFERS)
 613          _swrast_update_depth_stencil(ctx);
 614
 615       swrast->NewState = 0;
 616       swrast->StateChanges = 0;
 617       swrast->InvalidateState = _swrast_invalidate_state;
 618    }
 619 }
 620
 621 #define SWRAST_DEBUG 0
 622
 623 /* Public entrypoints:  See also s_bitmap.c, etc.
 624  */
 625 void
 626 _swrast_Quad( struct gl_context *ctx,
 627               const SWvertex *v0, const SWvertex *v1,
 628               const SWvertex *v2, const SWvertex *v3 )
 629 {
 630    if (SWRAST_DEBUG) {
 631       _mesa_debug(ctx, "_swrast_Quad\n");
 632       _swrast_print_vertex( ctx, v0 );
 633       _swrast_print_vertex( ctx, v1 );
 634       _swrast_print_vertex( ctx, v2 );
 635       _swrast_print_vertex( ctx, v3 );
 636    }
 637    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 638    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 639 }
 640
 641 void
 642 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 643                   const SWvertex *v1, const SWvertex *v2 )
 644 {
 645    if (SWRAST_DEBUG) {
 646       _mesa_debug(ctx, "_swrast_Triangle\n");
 647       _swrast_print_vertex( ctx, v0 );
 648       _swrast_print_vertex( ctx, v1 );
 649       _swrast_print_vertex( ctx, v2 );
 650    }
 651    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 652 }
 653
 654 void
 655 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 656 {
 657    if (SWRAST_DEBUG) {
 658       _mesa_debug(ctx, "_swrast_Line\n");
 659       _swrast_print_vertex( ctx, v0 );
 660       _swrast_print_vertex( ctx, v1 );
 661    }
 662    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 663 }
 664
 665 void
 666 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 667 {
 668    if (SWRAST_DEBUG) {
 669       _mesa_debug(ctx, "_swrast_Point\n");
 670       _swrast_print_vertex( ctx, v0 );
 671    }
 672    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 673 }
 674
 675 void
 676 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 677 {
 678    if (SWRAST_DEBUG) {
 679       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 680    }
 681    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 682 }
 683
 684 void
 685 _swrast_ResetLineStipple( struct gl_context *ctx )
 686 {
 687    if (SWRAST_DEBUG) {
 688       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 689    }
 690    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 691 }
 692
 693 void
 694 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 695 {
 696    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 697 }
 698
 699 void
 700 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 701 {
 702    if (SWRAST_DEBUG) {
 703       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 704    }
 705    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 706    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 707 }
 708
 709 void
 710 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 711 {
 712    if (SWRAST_DEBUG) {
 713       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 714    }
 715    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 716    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 717 }
 718
 719
 720 /**
 721  * Initialize native program limits by copying the logical limits.
 722  * See comments in init_program_limits() in context.c
 723  */
 724 static void
 725 init_program_native_limits(struct gl_program_constants *prog)
 726 {
 727    prog->MaxNativeInstructions = prog->MaxInstructions;
 728    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 729    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 730    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 731    prog->MaxNativeAttribs = prog->MaxAttribs;
 732    prog->MaxNativeTemps = prog->MaxTemps;
 733    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 734    prog->MaxNativeParameters = prog->MaxParameters;
 735 }
 736
 737
 738 GLboolean
 739 _swrast_CreateContext( struct gl_context *ctx )
 740 {
 741    GLuint i;
 742    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 743 #ifdef _OPENMP
 744    const GLint maxThreads = omp_get_max_threads();
 745 #else
 746    const GLint maxThreads = 1;
 747 #endif
 748
 749    if (SWRAST_DEBUG) {
 750       _mesa_debug(ctx, "_swrast_CreateContext\n");
 751    }
 752
 753    if (!swrast)
 754       return GL_FALSE;
 755
 756    swrast->NewState = ~0;
 757
 758    swrast->choose_point = _swrast_choose_point;
 759    swrast->choose_line = _swrast_choose_line;
 760    swrast->choose_triangle = _swrast_choose_triangle;
 761
 762    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 763    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 764    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 765
 766    swrast->Point = _swrast_validate_point;
 767    swrast->Line = _swrast_validate_line;
 768    swrast->Triangle = _swrast_validate_triangle;
 769    swrast->InvalidateState = _swrast_sleep;
 770    swrast->BlendFunc = _swrast_validate_blend_func;
 771
 772    swrast->AllowVertexFog = GL_TRUE;
 773    swrast->AllowPixelFog = GL_TRUE;
 774
 775    swrast->Driver.SpanRenderStart = _swrast_span_render_start;
 776    swrast->Driver.SpanRenderFinish = _swrast_span_render_finish;
 777
 778    ctx->Driver.MapTexture = _swrast_map_texture;
 779    ctx->Driver.UnmapTexture = _swrast_unmap_texture;
 780
 781    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 782       swrast->TextureSample[i] = NULL;
 783
 784    /* SpanArrays is global and shared by all SWspan instances. However, when
 785     * using multiple threads, it is necessary to have one SpanArrays instance
 786     * per thread.
 787     */
 788    swrast->SpanArrays = (SWspanarrays *) MALLOC(maxThreads * sizeof(SWspanarrays));
 789    if (!swrast->SpanArrays) {
 790       FREE(swrast);
 791       return GL_FALSE;
 792    }
 793    for(i = 0; i < maxThreads; i++) {
 794       swrast->SpanArrays[i].ChanType = CHAN_TYPE;
 795 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 796       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba8;
 797 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 798       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba16;
 799 #else
 800       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].attribs[FRAG_ATTRIB_COL0];
 801 #endif
 802    }
 803
 804    /* init point span buffer */
 805    swrast->PointSpan.primitive = GL_POINT;
 806    swrast->PointSpan.end = 0;
 807    swrast->PointSpan.facing = 0;
 808    swrast->PointSpan.array = swrast->SpanArrays;
 809
 810    init_program_native_limits(&ctx->Const.VertexProgram);
 811    init_program_native_limits(&ctx->Const.GeometryProgram);
 812    init_program_native_limits(&ctx->Const.FragmentProgram);
 813
 814    ctx->swrast_context = swrast;
 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    if (swrast->ZoomedArrays)
 830       FREE( swrast->ZoomedArrays );
 831    FREE( swrast->TexelBuffer );
 832    FREE( swrast );
 833
 834    ctx->swrast_context = 0;
 835 }
 836
 837
 838 struct swrast_device_driver *
 839 _swrast_GetDeviceDriverReference( struct gl_context *ctx )
 840 {
 841    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 842    return &swrast->Driver;
 843 }
 844
 845 void
 846 _swrast_flush( struct gl_context *ctx )
 847 {
 848    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 849    /* flush any pending fragments from rendering points */
 850    if (swrast->PointSpan.end > 0) {
 851       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 852       swrast->PointSpan.end = 0;
 853    }
 854 }
 855
 856 void
 857 _swrast_render_primitive( struct gl_context *ctx, GLenum prim )
 858 {
 859    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 860    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 861       _swrast_flush(ctx);
 862    }
 863    swrast->Primitive = prim;
 864 }
 865
 866
 867 /** called via swrast->Driver.SpanRenderStart() */
 868 void
 869 _swrast_span_render_start(struct gl_context *ctx)
 870 {
 871    _swrast_map_textures(ctx);
 872    _swrast_map_renderbuffers(ctx);
 873 }
 874
 875
 876 /** called via swrast->Driver.SpanRenderFinish() */
 877 void
 878 _swrast_span_render_finish(struct gl_context *ctx)
 879 {
 880    _swrast_unmap_textures(ctx);
 881    _swrast_unmap_renderbuffers(ctx);
 882 }
 883
 884
 885 void
 886 _swrast_render_start( struct gl_context *ctx )
 887 {
 888    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 889    if (swrast->Driver.SpanRenderStart)
 890       swrast->Driver.SpanRenderStart( ctx );
 891    swrast->PointSpan.end = 0;
 892 }
 893
 894 void
 895 _swrast_render_finish( struct gl_context *ctx )
 896 {
 897    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 898    if (swrast->Driver.SpanRenderFinish)
 899       swrast->Driver.SpanRenderFinish( ctx );
 900
 901    _swrast_flush(ctx);
 902 }
 903
 904
 905 #define SWRAST_DEBUG_VERTICES 0
 906
 907 void
 908 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 909 {
 910    GLuint i;
 911
 912    if (SWRAST_DEBUG_VERTICES) {
 913       _mesa_debug(ctx, "win %f %f %f %f\n",
 914                   v->attrib[FRAG_ATTRIB_WPOS][0],
 915                   v->attrib[FRAG_ATTRIB_WPOS][1],
 916                   v->attrib[FRAG_ATTRIB_WPOS][2],
 917                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 918
 919       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 920          if (ctx->Texture.Unit[i]._ReallyEnabled)
 921             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 922                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 923                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 924                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 925                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 926
 927 #if CHAN_TYPE == GL_FLOAT
 928       _mesa_debug(ctx, "color %f %f %f %f\n",
 929                   v->color[0], v->color[1], v->color[2], v->color[3]);
 930 #else
 931       _mesa_debug(ctx, "color %d %d %d %d\n",
 932                   v->color[0], v->color[1], v->color[2], v->color[3]);
 933 #endif
 934       _mesa_debug(ctx, "spec %g %g %g %g\n",
 935                   v->attrib[FRAG_ATTRIB_COL1][0],
 936                   v->attrib[FRAG_ATTRIB_COL1][1],
 937                   v->attrib[FRAG_ATTRIB_COL1][2],
 938                   v->attrib[FRAG_ATTRIB_COL1][3]);
 939       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 940       _mesa_debug(ctx, "index %f\n", v->attrib[FRAG_ATTRIB_CI][0]);
 941       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 942       _mesa_debug(ctx, "\n");
 943    }
 944 }