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_triangle.h"
  43 #include "s_texfilter.h"
  44
  45
  46 /**
  47  * Recompute the value of swrast->_RasterMask, etc. according to
  48  * the current context.  The _RasterMask field can be easily tested by
  49  * drivers to determine certain basic GL state (does the primitive need
  50  * stenciling, logic-op, fog, etc?).
  51  */
  52 static void
  53 _swrast_update_rasterflags( GLcontext *ctx )
  54 {
  55    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  56    GLbitfield rasterMask = 0;
  57    GLuint i;
  58
  59    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  60    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  61    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  62    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  63    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  64    if (ctx->Stencil._Enabled)             rasterMask |= STENCIL_BIT;
  65    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  66       if (!ctx->Color.ColorMask[i][0] ||
  67           !ctx->Color.ColorMask[i][1] ||
  68           !ctx->Color.ColorMask[i][2] ||
  69           !ctx->Color.ColorMask[i][3]) {
  70          rasterMask |= MASKING_BIT;
  71          break;
  72       }
  73    }
  74    if (ctx->Color._LogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  75    if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  76    if (   ctx->Viewport.X < 0
  77        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  78        || ctx->Viewport.Y < 0
  79        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  80       rasterMask |= CLIP_BIT;
  81    }
  82
  83    if (ctx->Query.CurrentOcclusionObject)
  84       rasterMask |= OCCLUSION_BIT;
  85
  86
  87    /* If we're not drawing to exactly one color buffer set the
  88     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  89     * buffers or the RGBA or CI mask disables all writes.
  90     */
  91    if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
  92       /* more than one color buffer designated for writing (or zero buffers) */
  93       rasterMask |= MULTI_DRAW_BIT;
  94    }
  95
  96    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  97       if (ctx->Color.ColorMask[i][0] +
  98           ctx->Color.ColorMask[i][1] +
  99           ctx->Color.ColorMask[i][2] +
 100           ctx->Color.ColorMask[i][3] == 0) {
 101          rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 102          break;
 103       }
 104    }
 105
 106
 107    if (ctx->FragmentProgram._Current) {
 108       rasterMask |= FRAGPROG_BIT;
 109    }
 110
 111    if (ctx->ATIFragmentShader._Enabled) {
 112       rasterMask |= ATIFRAGSHADER_BIT;
 113    }
 114
 115 #if CHAN_TYPE == GL_FLOAT
 116    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 117       rasterMask |= CLAMPING_BIT;
 118    }
 119 #endif
 120
 121    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 122 }
 123
 124
 125 /**
 126  * Examine polygon cull state to compute the _BackfaceCullSign field.
 127  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 128  * and 1 if culling front-faces.  The Polygon FrontFace state also
 129  * factors in.
 130  */
 131 static void
 132 _swrast_update_polygon( GLcontext *ctx )
 133 {
 134    GLfloat backface_sign;
 135
 136    if (ctx->Polygon.CullFlag) {
 137       switch (ctx->Polygon.CullFaceMode) {
 138       case GL_BACK:
 139          backface_sign = -1.0F;
 140          break;
 141       case GL_FRONT:
 142          backface_sign = 1.0F;
 143          break;
 144       case GL_FRONT_AND_BACK:
 145          /* fallthrough */
 146       default:
 147          backface_sign = 0.0F;
 148       }
 149    }
 150    else {
 151       backface_sign = 0.0F;
 152    }
 153
 154    SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
 155
 156    /* This is for front/back-face determination, but not for culling */
 157    SWRAST_CONTEXT(ctx)->_BackfaceSign
 158       = (ctx->Polygon.FrontFace == GL_CW) ? -1.0F : 1.0F;
 159 }
 160
 161
 162
 163 /**
 164  * Update the _PreferPixelFog field to indicate if we need to compute
 165  * fog blend factors (from the fog coords) per-fragment.
 166  */
 167 static void
 168 _swrast_update_fog_hint( GLcontext *ctx )
 169 {
 170    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 171    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 172                               ctx->FragmentProgram._Current ||
 173                               (ctx->Hint.Fog == GL_NICEST &&
 174                                swrast->AllowPixelFog));
 175 }
 176
 177
 178
 179 /**
 180  * Update the swrast->_TextureCombinePrimary flag.
 181  */
 182 static void
 183 _swrast_update_texture_env( GLcontext *ctx )
 184 {
 185    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 186    GLuint i;
 187
 188    swrast->_TextureCombinePrimary = GL_FALSE;
 189
 190    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 191       const struct gl_tex_env_combine_state *combine =
 192          ctx->Texture.Unit[i]._CurrentCombine;
 193       GLuint term;
 194       for (term = 0; term < combine->_NumArgsRGB; term++) {
 195          if (combine->SourceRGB[term] == GL_PRIMARY_COLOR) {
 196             swrast->_TextureCombinePrimary = GL_TRUE;
 197             return;
 198          }
 199          if (combine->SourceA[term] == GL_PRIMARY_COLOR) {
 200             swrast->_TextureCombinePrimary = GL_TRUE;
 201             return;
 202          }
 203       }
 204    }
 205 }
 206
 207
 208 /**
 209  * Determine if we can defer texturing/shading until after Z/stencil
 210  * testing.  This potentially allows us to skip texturing/shading for
 211  * lots of fragments.
 212  */
 213 static void
 214 _swrast_update_deferred_texture(GLcontext *ctx)
 215 {
 216    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 217    if (ctx->Color.AlphaEnabled) {
 218       /* alpha test depends on post-texture/shader colors */
 219       swrast->_DeferredTexture = GL_FALSE;
 220    }
 221    else {
 222       const struct gl_fragment_program *fprog
 223          = ctx->FragmentProgram._Current;
 224       if (fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
 225          /* Z comes from fragment program/shader */
 226          swrast->_DeferredTexture = GL_FALSE;
 227       }
 228       else if (fprog && fprog->UsesKill) {
 229          swrast->_DeferredTexture = GL_FALSE;
 230       }
 231       else if (ctx->Query.CurrentOcclusionObject) {
 232          /* occlusion query depends on shader discard/kill results */
 233          swrast->_DeferredTexture = GL_FALSE;
 234       }
 235       else {
 236          swrast->_DeferredTexture = GL_TRUE;
 237       }
 238    }
 239 }
 240
 241
 242 /**
 243  * Update swrast->_FogColor and swrast->_FogEnable values.
 244  */
 245 static void
 246 _swrast_update_fog_state( GLcontext *ctx )
 247 {
 248    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 249    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 250
 251    /* determine if fog is needed, and if so, which fog mode */
 252    swrast->_FogEnabled = GL_FALSE;
 253    if (fp && fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
 254       if (fp->FogOption != GL_NONE) {
 255          swrast->_FogEnabled = GL_TRUE;
 256          swrast->_FogMode = fp->FogOption;
 257       }
 258    }
 259    else if (ctx->Fog.Enabled) {
 260       swrast->_FogEnabled = GL_TRUE;
 261       swrast->_FogMode = ctx->Fog.Mode;
 262    }
 263 }
 264
 265
 266 /**
 267  * Update state for running fragment programs.  Basically, load the
 268  * program parameters with current state values.
 269  */
 270 static void
 271 _swrast_update_fragment_program(GLcontext *ctx, GLbitfield newState)
 272 {
 273    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 274    if (fp) {
 275       _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 276    }
 277 }
 278
 279
 280 /**
 281  * See if we can do early diffuse+specular (primary+secondary) color
 282  * add per vertex instead of per-fragment.
 283  */
 284 static void
 285 _swrast_update_specular_vertex_add(GLcontext *ctx)
 286 {
 287    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 288    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 289       (ctx->Light.Enabled &&
 290        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 291
 292    swrast->SpecularVertexAdd = (separateSpecular
 293                                 && ctx->Texture._EnabledUnits == 0x0
 294                                 && !ctx->FragmentProgram._Current
 295                                 && !ctx->ATIFragmentShader._Enabled);
 296 }
 297
 298
 299 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 300                              _NEW_PROGRAM_CONSTANTS |   \
 301                              _NEW_TEXTURE |             \
 302                              _NEW_HINT |                \
 303                              _NEW_POLYGON )
 304
 305 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 306  */
 307 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 308                               _NEW_RENDERMODE|                  \
 309                               _NEW_POLYGON|                     \
 310                               _NEW_DEPTH|                       \
 311                               _NEW_STENCIL|                     \
 312                               _NEW_COLOR|                       \
 313                               _NEW_TEXTURE|                     \
 314                               _SWRAST_NEW_RASTERMASK|           \
 315                               _NEW_LIGHT|                       \
 316                               _NEW_FOG |                        \
 317                               _DD_NEW_SEPARATE_SPECULAR)
 318
 319 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 320                           _NEW_RENDERMODE|              \
 321                           _NEW_LINE|                    \
 322                           _NEW_TEXTURE|                 \
 323                           _NEW_LIGHT|                   \
 324                           _NEW_FOG|                     \
 325                           _NEW_DEPTH |                  \
 326                           _DD_NEW_SEPARATE_SPECULAR)
 327
 328 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 329                            _NEW_RENDERMODE |            \
 330                            _NEW_POINT |                 \
 331                            _NEW_TEXTURE |               \
 332                            _NEW_LIGHT |                 \
 333                            _NEW_FOG |                   \
 334                            _DD_NEW_SEPARATE_SPECULAR)
 335
 336 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 337
 338 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 339
 340 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 341
 342
 343
 344 /**
 345  * Stub for swrast->Triangle to select a true triangle function
 346  * after a state change.
 347  */
 348 static void
 349 _swrast_validate_triangle( GLcontext *ctx,
 350                            const SWvertex *v0,
 351                            const SWvertex *v1,
 352                            const SWvertex *v2 )
 353 {
 354    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 355
 356    _swrast_validate_derived( ctx );
 357    swrast->choose_triangle( ctx );
 358    ASSERT(swrast->Triangle);
 359
 360    if (swrast->SpecularVertexAdd) {
 361       /* separate specular color, but no texture */
 362       swrast->SpecTriangle = swrast->Triangle;
 363       swrast->Triangle = _swrast_add_spec_terms_triangle;
 364    }
 365
 366    swrast->Triangle( ctx, v0, v1, v2 );
 367 }
 368
 369 /**
 370  * Called via swrast->Line.  Examine current GL state and choose a software
 371  * line routine.  Then call it.
 372  */
 373 static void
 374 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 375 {
 376    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 377
 378    _swrast_validate_derived( ctx );
 379    swrast->choose_line( ctx );
 380    ASSERT(swrast->Line);
 381
 382    if (swrast->SpecularVertexAdd) {
 383       swrast->SpecLine = swrast->Line;
 384       swrast->Line = _swrast_add_spec_terms_line;
 385    }
 386
 387    swrast->Line( ctx, v0, v1 );
 388 }
 389
 390 /**
 391  * Called via swrast->Point.  Examine current GL state and choose a software
 392  * point routine.  Then call it.
 393  */
 394 static void
 395 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 396 {
 397    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 398
 399    _swrast_validate_derived( ctx );
 400    swrast->choose_point( ctx );
 401
 402    if (swrast->SpecularVertexAdd) {
 403       swrast->SpecPoint = swrast->Point;
 404       swrast->Point = _swrast_add_spec_terms_point;
 405    }
 406
 407    swrast->Point( ctx, v0 );
 408 }
 409
 410
 411 /**
 412  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 413  * function, then call it.
 414  */
 415 static void _ASMAPI
 416 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 417                             GLvoid *src, const GLvoid *dst,
 418                             GLenum chanType )
 419 {
 420    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 421
 422    _swrast_validate_derived( ctx ); /* why is this needed? */
 423    _swrast_choose_blend_func( ctx, chanType );
 424
 425    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 426 }
 427
 428
 429 /**
 430  * Make sure we have texture image data for all the textures we may need
 431  * for subsequent rendering.
 432  */
 433 static void
 434 _swrast_validate_texture_images(GLcontext *ctx)
 435 {
 436    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 437    GLuint u;
 438
 439    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 440       /* no textures enabled, or no way to validate images! */
 441       return;
 442    }
 443
 444    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 445       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 446          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 447          ASSERT(texObj);
 448          if (texObj) {
 449             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 450             GLuint face;
 451             for (face = 0; face < numFaces; face++) {
 452                GLint lvl;
 453                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 454                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 455                   if (texImg && !texImg->Data) {
 456                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 457                      ASSERT(texObj->Image[face][lvl]->Data);
 458                   }
 459                }
 460             }
 461          }
 462       }
 463    }
 464 }
 465
 466
 467 /**
 468  * Free the texture image data attached to all currently enabled
 469  * textures.  Meant to be called by device drivers when transitioning
 470  * from software to hardware rendering.
 471  */
 472 void
 473 _swrast_eject_texture_images(GLcontext *ctx)
 474 {
 475    GLuint u;
 476
 477    if (!ctx->Texture._EnabledUnits) {
 478       /* no textures enabled */
 479       return;
 480    }
 481
 482    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 483       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 484          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 485          ASSERT(texObj);
 486          if (texObj) {
 487             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 488             GLuint face;
 489             for (face = 0; face < numFaces; face++) {
 490                GLint lvl;
 491                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 492                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 493                   if (texImg && texImg->Data) {
 494                      _mesa_free_texmemory(texImg->Data);
 495                      texImg->Data = NULL;
 496                   }
 497                }
 498             }
 499          }
 500       }
 501    }
 502 }
 503
 504
 505
 506 static void
 507 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 508 {
 509    (void) ctx; (void) new_state;
 510 }
 511
 512
 513 static void
 514 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 515 {
 516    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 517    GLuint i;
 518
 519    swrast->NewState |= new_state;
 520
 521    /* After 10 statechanges without any swrast functions being called,
 522     * put the module to sleep.
 523     */
 524    if (++swrast->StateChanges > 10) {
 525       swrast->InvalidateState = _swrast_sleep;
 526       swrast->NewState = ~0;
 527       new_state = ~0;
 528    }
 529
 530    if (new_state & swrast->InvalidateTriangleMask)
 531       swrast->Triangle = _swrast_validate_triangle;
 532
 533    if (new_state & swrast->InvalidateLineMask)
 534       swrast->Line = _swrast_validate_line;
 535
 536    if (new_state & swrast->InvalidatePointMask)
 537       swrast->Point = _swrast_validate_point;
 538
 539    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 540       swrast->BlendFunc = _swrast_validate_blend_func;
 541
 542    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 543       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 544          swrast->TextureSample[i] = NULL;
 545 }
 546
 547
 548 void
 549 _swrast_update_texture_samplers(GLcontext *ctx)
 550 {
 551    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 552    GLuint u;
 553
 554    if (!swrast)
 555       return; /* pipe hack */
 556
 557    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 558       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 559       /* Note: If tObj is NULL, the sample function will be a simple
 560        * function that just returns opaque black (0,0,0,1).
 561        */
 562       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 563    }
 564 }
 565
 566
 567 /**
 568  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 569  * swrast->_ActiveAtttribMask.
 570  */
 571 static void
 572 _swrast_update_active_attribs(GLcontext *ctx)
 573 {
 574    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 575    GLuint attribsMask;
 576
 577    /*
 578     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 579     */
 580    if (ctx->FragmentProgram._Current) {
 581       /* fragment program/shader */
 582       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 583       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 584    }
 585    else if (ctx->ATIFragmentShader._Enabled) {
 586       attribsMask = ~0;  /* XXX fix me */
 587    }
 588    else {
 589       /* fixed function */
 590       attribsMask = 0x0;
 591
 592 #if CHAN_TYPE == GL_FLOAT
 593       attribsMask |= FRAG_BIT_COL0;
 594 #endif
 595
 596       if (ctx->Fog.ColorSumEnabled ||
 597           (ctx->Light.Enabled &&
 598            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 599          attribsMask |= FRAG_BIT_COL1;
 600       }
 601
 602       if (swrast->_FogEnabled)
 603          attribsMask |= FRAG_BIT_FOGC;
 604
 605       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 606    }
 607
 608    swrast->_ActiveAttribMask = attribsMask;
 609
 610    /* Update _ActiveAttribs[] list */
 611    {
 612       GLuint i, num = 0;
 613       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 614          if (attribsMask & (1 << i)) {
 615             swrast->_ActiveAttribs[num++] = i;
 616             /* how should this attribute be interpolated? */
 617             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 618                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 619             else
 620                swrast->_InterpMode[i] = GL_SMOOTH;
 621          }
 622       }
 623       swrast->_NumActiveAttribs = num;
 624    }
 625 }
 626
 627
 628 void
 629 _swrast_validate_derived( GLcontext *ctx )
 630 {
 631    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 632
 633    if (swrast->NewState) {
 634       if (swrast->NewState & _NEW_POLYGON)
 635          _swrast_update_polygon( ctx );
 636
 637       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 638          _swrast_update_fog_hint( ctx );
 639
 640       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 641          _swrast_update_texture_env( ctx );
 642
 643       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 644          _swrast_update_fog_state( ctx );
 645
 646       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 647          _swrast_update_fragment_program( ctx, swrast->NewState );
 648
 649       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 650          _swrast_update_texture_samplers( ctx );
 651          _swrast_validate_texture_images(ctx);
 652       }
 653
 654       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 655          _swrast_update_deferred_texture(ctx);
 656
 657       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 658          _swrast_update_rasterflags( ctx );
 659
 660       if (swrast->NewState & (_NEW_DEPTH |
 661                               _NEW_FOG |
 662                               _NEW_LIGHT |
 663                               _NEW_PROGRAM |
 664                               _NEW_TEXTURE))
 665          _swrast_update_active_attribs(ctx);
 666
 667       if (swrast->NewState & (_NEW_FOG |
 668                               _NEW_PROGRAM |
 669                               _NEW_LIGHT |
 670                               _NEW_TEXTURE))
 671          _swrast_update_specular_vertex_add(ctx);
 672
 673       swrast->NewState = 0;
 674       swrast->StateChanges = 0;
 675       swrast->InvalidateState = _swrast_invalidate_state;
 676    }
 677 }
 678
 679 #define SWRAST_DEBUG 0
 680
 681 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 682  */
 683 void
 684 _swrast_Quad( GLcontext *ctx,
 685               const SWvertex *v0, const SWvertex *v1,
 686               const SWvertex *v2, const SWvertex *v3 )
 687 {
 688    if (SWRAST_DEBUG) {
 689       _mesa_debug(ctx, "_swrast_Quad\n");
 690       _swrast_print_vertex( ctx, v0 );
 691       _swrast_print_vertex( ctx, v1 );
 692       _swrast_print_vertex( ctx, v2 );
 693       _swrast_print_vertex( ctx, v3 );
 694    }
 695    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 696    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 697 }
 698
 699 void
 700 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 701                   const SWvertex *v1, const SWvertex *v2 )
 702 {
 703    if (SWRAST_DEBUG) {
 704       _mesa_debug(ctx, "_swrast_Triangle\n");
 705       _swrast_print_vertex( ctx, v0 );
 706       _swrast_print_vertex( ctx, v1 );
 707       _swrast_print_vertex( ctx, v2 );
 708    }
 709    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 710 }
 711
 712 void
 713 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 714 {
 715    if (SWRAST_DEBUG) {
 716       _mesa_debug(ctx, "_swrast_Line\n");
 717       _swrast_print_vertex( ctx, v0 );
 718       _swrast_print_vertex( ctx, v1 );
 719    }
 720    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 721 }
 722
 723 void
 724 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 725 {
 726    if (SWRAST_DEBUG) {
 727       _mesa_debug(ctx, "_swrast_Point\n");
 728       _swrast_print_vertex( ctx, v0 );
 729    }
 730    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 731 }
 732
 733 void
 734 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 735 {
 736    if (SWRAST_DEBUG) {
 737       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 738    }
 739    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 740 }
 741
 742 void
 743 _swrast_ResetLineStipple( GLcontext *ctx )
 744 {
 745    if (SWRAST_DEBUG) {
 746       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 747    }
 748    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 749 }
 750
 751 void
 752 _swrast_SetFacing(GLcontext *ctx, GLuint facing)
 753 {
 754    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 755 }
 756
 757 void
 758 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 759 {
 760    if (SWRAST_DEBUG) {
 761       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 762    }
 763    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 764    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 765 }
 766
 767 void
 768 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 769 {
 770    if (SWRAST_DEBUG) {
 771       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 772    }
 773    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 774    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 775 }
 776
 777
 778 GLboolean
 779 _swrast_CreateContext( GLcontext *ctx )
 780 {
 781    GLuint i;
 782    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 783
 784    if (SWRAST_DEBUG) {
 785       _mesa_debug(ctx, "_swrast_CreateContext\n");
 786    }
 787
 788    if (!swrast)
 789       return GL_FALSE;
 790
 791    swrast->NewState = ~0;
 792
 793    swrast->choose_point = _swrast_choose_point;
 794    swrast->choose_line = _swrast_choose_line;
 795    swrast->choose_triangle = _swrast_choose_triangle;
 796
 797    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 798    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 799    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 800
 801    swrast->Point = _swrast_validate_point;
 802    swrast->Line = _swrast_validate_line;
 803    swrast->Triangle = _swrast_validate_triangle;
 804    swrast->InvalidateState = _swrast_sleep;
 805    swrast->BlendFunc = _swrast_validate_blend_func;
 806
 807    swrast->AllowVertexFog = GL_TRUE;
 808    swrast->AllowPixelFog = GL_TRUE;
 809
 810    /* Optimized Accum buffer */
 811    swrast->_IntegerAccumMode = GL_FALSE;
 812    swrast->_IntegerAccumScaler = 0.0;
 813
 814    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 815       swrast->TextureSample[i] = NULL;
 816
 817    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 818    if (!swrast->SpanArrays) {
 819       FREE(swrast);
 820       return GL_FALSE;
 821    }
 822    swrast->SpanArrays->ChanType = CHAN_TYPE;
 823 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 824    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;
 825 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 826    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;
 827 #else
 828    swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 829 #endif
 830
 831    /* init point span buffer */
 832    swrast->PointSpan.primitive = GL_POINT;
 833    swrast->PointSpan.end = 0;
 834    swrast->PointSpan.facing = 0;
 835    swrast->PointSpan.array = swrast->SpanArrays;
 836
 837    swrast->TexelBuffer = (GLfloat *) MALLOC(ctx->Const.MaxTextureImageUnits *
 838                                            MAX_WIDTH * 4 * sizeof(GLfloat));
 839    if (!swrast->TexelBuffer) {
 840       FREE(swrast->SpanArrays);
 841       FREE(swrast);
 842       return GL_FALSE;
 843    }
 844
 845    ctx->swrast_context = swrast;
 846
 847    return GL_TRUE;
 848 }
 849
 850 void
 851 _swrast_DestroyContext( GLcontext *ctx )
 852 {
 853    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 854
 855    if (SWRAST_DEBUG) {
 856       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 857    }
 858
 859    FREE( swrast->SpanArrays );
 860    if (swrast->ZoomedArrays)
 861       FREE( swrast->ZoomedArrays );
 862    FREE( swrast->TexelBuffer );
 863    FREE( swrast );
 864
 865    ctx->swrast_context = 0;
 866 }
 867
 868
 869 struct swrast_device_driver *
 870 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 871 {
 872    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 873    return &swrast->Driver;
 874 }
 875
 876 void
 877 _swrast_flush( GLcontext *ctx )
 878 {
 879    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 880    /* flush any pending fragments from rendering points */
 881    if (swrast->PointSpan.end > 0) {
 882       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 883       swrast->PointSpan.end = 0;
 884    }
 885 }
 886
 887 void
 888 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 889 {
 890    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 891    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 892       _swrast_flush(ctx);
 893    }
 894    swrast->Primitive = prim;
 895 }
 896
 897
 898 void
 899 _swrast_render_start( GLcontext *ctx )
 900 {
 901    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 902    if (swrast->Driver.SpanRenderStart)
 903       swrast->Driver.SpanRenderStart( ctx );
 904    swrast->PointSpan.end = 0;
 905 }
 906
 907 void
 908 _swrast_render_finish( GLcontext *ctx )
 909 {
 910    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 911    if (swrast->Driver.SpanRenderFinish)
 912       swrast->Driver.SpanRenderFinish( ctx );
 913
 914    _swrast_flush(ctx);
 915 }
 916
 917
 918 #define SWRAST_DEBUG_VERTICES 0
 919
 920 void
 921 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 922 {
 923    GLuint i;
 924
 925    if (SWRAST_DEBUG_VERTICES) {
 926       _mesa_debug(ctx, "win %f %f %f %f\n",
 927                   v->attrib[FRAG_ATTRIB_WPOS][0],
 928                   v->attrib[FRAG_ATTRIB_WPOS][1],
 929                   v->attrib[FRAG_ATTRIB_WPOS][2],
 930                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 931
 932       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 933          if (ctx->Texture.Unit[i]._ReallyEnabled)
 934             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 935                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 936                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 937                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 938                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 939
 940 #if CHAN_TYPE == GL_FLOAT
 941       _mesa_debug(ctx, "color %f %f %f %f\n",
 942                   v->color[0], v->color[1], v->color[2], v->color[3]);
 943 #else
 944       _mesa_debug(ctx, "color %d %d %d %d\n",
 945                   v->color[0], v->color[1], v->color[2], v->color[3]);
 946 #endif
 947       _mesa_debug(ctx, "spec %g %g %g %g\n",
 948                   v->attrib[FRAG_ATTRIB_COL1][0],
 949                   v->attrib[FRAG_ATTRIB_COL1][1],
 950                   v->attrib[FRAG_ATTRIB_COL1][2],
 951                   v->attrib[FRAG_ATTRIB_COL1][3]);
 952       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 953       _mesa_debug(ctx, "index %f\n", v->attrib[FRAG_ATTRIB_CI][0]);
 954       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 955       _mesa_debug(ctx, "\n");
 956    }
 957 }