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/context.h"
  32 #include "main/colormac.h"
  33 #include "main/mtypes.h"
  34 #include "main/teximage.h"
  35 #include "shader/prog_parameter.h"
  36 #include "shader/prog_statevars.h"
  37 #include "swrast.h"
  38 #include "s_blend.h"
  39 #include "s_context.h"
  40 #include "s_lines.h"
  41 #include "s_points.h"
  42 #include "s_span.h"
  43 #include "s_triangle.h"
  44 #include "s_texfilter.h"
  45
  46
  47 /**
  48  * Recompute the value of swrast->_RasterMask, etc. according to
  49  * the current context.  The _RasterMask field can be easily tested by
  50  * drivers to determine certain basic GL state (does the primitive need
  51  * stenciling, logic-op, fog, etc?).
  52  */
  53 static void
  54 _swrast_update_rasterflags( GLcontext *ctx )
  55 {
  56    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  57    GLbitfield rasterMask = 0;
  58    GLuint i;
  59
  60    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  61    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  62    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  63    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  64    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  65    if (ctx->Stencil._Enabled)             rasterMask |= STENCIL_BIT;
  66    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  67       if (!ctx->Color.ColorMask[i][0] ||
  68           !ctx->Color.ColorMask[i][1] ||
  69           !ctx->Color.ColorMask[i][2] ||
  70           !ctx->Color.ColorMask[i][3]) {
  71          rasterMask |= MASKING_BIT;
  72          break;
  73       }
  74    }
  75    if (ctx->Color._LogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  76    if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  77    if (   ctx->Viewport.X < 0
  78        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  79        || ctx->Viewport.Y < 0
  80        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  81       rasterMask |= CLIP_BIT;
  82    }
  83
  84    if (ctx->Query.CurrentOcclusionObject)
  85       rasterMask |= OCCLUSION_BIT;
  86
  87
  88    /* If we're not drawing to exactly one color buffer set the
  89     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  90     * buffers or the RGBA or CI mask disables all writes.
  91     */
  92    if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
  93       /* more than one color buffer designated for writing (or zero buffers) */
  94       rasterMask |= MULTI_DRAW_BIT;
  95    }
  96
  97    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  98       if (ctx->Color.ColorMask[i][0] +
  99           ctx->Color.ColorMask[i][1] +
 100           ctx->Color.ColorMask[i][2] +
 101           ctx->Color.ColorMask[i][3] == 0) {
 102          rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 103          break;
 104       }
 105    }
 106
 107
 108    if (ctx->FragmentProgram._Current) {
 109       rasterMask |= FRAGPROG_BIT;
 110    }
 111
 112    if (ctx->ATIFragmentShader._Enabled) {
 113       rasterMask |= ATIFRAGSHADER_BIT;
 114    }
 115
 116 #if CHAN_TYPE == GL_FLOAT
 117    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 118       rasterMask |= CLAMPING_BIT;
 119    }
 120 #endif
 121
 122    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 123 }
 124
 125
 126 /**
 127  * Examine polygon cull state to compute the _BackfaceCullSign field.
 128  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 129  * and 1 if culling front-faces.  The Polygon FrontFace state also
 130  * factors in.
 131  */
 132 static void
 133 _swrast_update_polygon( GLcontext *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( GLcontext *ctx )
 170 {
 171    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 172    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 173                               ctx->FragmentProgram._Current ||
 174                               (ctx->Hint.Fog == GL_NICEST &&
 175                                swrast->AllowPixelFog));
 176 }
 177
 178
 179
 180 /**
 181  * Update the swrast->_TextureCombinePrimary flag.
 182  */
 183 static void
 184 _swrast_update_texture_env( GLcontext *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(GLcontext *ctx)
 216 {
 217    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 218    if (ctx->Color.AlphaEnabled) {
 219       /* alpha test depends on post-texture/shader colors */
 220       swrast->_DeferredTexture = GL_FALSE;
 221    }
 222    else {
 223       const struct gl_fragment_program *fprog
 224          = ctx->FragmentProgram._Current;
 225       if (fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
 226          /* Z comes from fragment program/shader */
 227          swrast->_DeferredTexture = GL_FALSE;
 228       }
 229       else if (fprog && fprog->UsesKill) {
 230          swrast->_DeferredTexture = GL_FALSE;
 231       }
 232       else if (ctx->Query.CurrentOcclusionObject) {
 233          /* occlusion query depends on shader discard/kill results */
 234          swrast->_DeferredTexture = GL_FALSE;
 235       }
 236       else {
 237          swrast->_DeferredTexture = GL_TRUE;
 238       }
 239    }
 240 }
 241
 242
 243 /**
 244  * Update swrast->_FogColor and swrast->_FogEnable values.
 245  */
 246 static void
 247 _swrast_update_fog_state( GLcontext *ctx )
 248 {
 249    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 250    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 251
 252    /* determine if fog is needed, and if so, which fog mode */
 253    swrast->_FogEnabled = GL_FALSE;
 254    if (fp && fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
 255       if (fp->FogOption != GL_NONE) {
 256          swrast->_FogEnabled = GL_TRUE;
 257          swrast->_FogMode = fp->FogOption;
 258       }
 259    }
 260    else if (ctx->Fog.Enabled) {
 261       swrast->_FogEnabled = GL_TRUE;
 262       swrast->_FogMode = ctx->Fog.Mode;
 263    }
 264 }
 265
 266
 267 /**
 268  * Update state for running fragment programs.  Basically, load the
 269  * program parameters with current state values.
 270  */
 271 static void
 272 _swrast_update_fragment_program(GLcontext *ctx, GLbitfield newState)
 273 {
 274    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 275    if (fp) {
 276       _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 277    }
 278 }
 279
 280
 281 /**
 282  * See if we can do early diffuse+specular (primary+secondary) color
 283  * add per vertex instead of per-fragment.
 284  */
 285 static void
 286 _swrast_update_specular_vertex_add(GLcontext *ctx)
 287 {
 288    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 289    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 290       (ctx->Light.Enabled &&
 291        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 292
 293    swrast->SpecularVertexAdd = (separateSpecular
 294                                 && ctx->Texture._EnabledUnits == 0x0
 295                                 && !ctx->FragmentProgram._Current
 296                                 && !ctx->ATIFragmentShader._Enabled);
 297 }
 298
 299
 300 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 301                              _NEW_PROGRAM_CONSTANTS |   \
 302                              _NEW_TEXTURE |             \
 303                              _NEW_HINT |                \
 304                              _NEW_POLYGON )
 305
 306 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 307  */
 308 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 309                               _NEW_RENDERMODE|                  \
 310                               _NEW_POLYGON|                     \
 311                               _NEW_DEPTH|                       \
 312                               _NEW_STENCIL|                     \
 313                               _NEW_COLOR|                       \
 314                               _NEW_TEXTURE|                     \
 315                               _SWRAST_NEW_RASTERMASK|           \
 316                               _NEW_LIGHT|                       \
 317                               _NEW_FOG |                        \
 318                               _DD_NEW_SEPARATE_SPECULAR)
 319
 320 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 321                           _NEW_RENDERMODE|              \
 322                           _NEW_LINE|                    \
 323                           _NEW_TEXTURE|                 \
 324                           _NEW_LIGHT|                   \
 325                           _NEW_FOG|                     \
 326                           _NEW_DEPTH |                  \
 327                           _DD_NEW_SEPARATE_SPECULAR)
 328
 329 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 330                            _NEW_RENDERMODE |            \
 331                            _NEW_POINT |                 \
 332                            _NEW_TEXTURE |               \
 333                            _NEW_LIGHT |                 \
 334                            _NEW_FOG |                   \
 335                            _DD_NEW_SEPARATE_SPECULAR)
 336
 337 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 338
 339 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 340
 341 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 342
 343
 344
 345 /**
 346  * Stub for swrast->Triangle to select a true triangle function
 347  * after a state change.
 348  */
 349 static void
 350 _swrast_validate_triangle( GLcontext *ctx,
 351                            const SWvertex *v0,
 352                            const SWvertex *v1,
 353                            const SWvertex *v2 )
 354 {
 355    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 356
 357    _swrast_validate_derived( ctx );
 358    swrast->choose_triangle( ctx );
 359    ASSERT(swrast->Triangle);
 360
 361    if (swrast->SpecularVertexAdd) {
 362       /* separate specular color, but no texture */
 363       swrast->SpecTriangle = swrast->Triangle;
 364       swrast->Triangle = _swrast_add_spec_terms_triangle;
 365    }
 366
 367    swrast->Triangle( ctx, v0, v1, v2 );
 368 }
 369
 370 /**
 371  * Called via swrast->Line.  Examine current GL state and choose a software
 372  * line routine.  Then call it.
 373  */
 374 static void
 375 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 376 {
 377    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 378
 379    _swrast_validate_derived( ctx );
 380    swrast->choose_line( ctx );
 381    ASSERT(swrast->Line);
 382
 383    if (swrast->SpecularVertexAdd) {
 384       swrast->SpecLine = swrast->Line;
 385       swrast->Line = _swrast_add_spec_terms_line;
 386    }
 387
 388    swrast->Line( ctx, v0, v1 );
 389 }
 390
 391 /**
 392  * Called via swrast->Point.  Examine current GL state and choose a software
 393  * point routine.  Then call it.
 394  */
 395 static void
 396 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 397 {
 398    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 399
 400    _swrast_validate_derived( ctx );
 401    swrast->choose_point( ctx );
 402
 403    if (swrast->SpecularVertexAdd) {
 404       swrast->SpecPoint = swrast->Point;
 405       swrast->Point = _swrast_add_spec_terms_point;
 406    }
 407
 408    swrast->Point( ctx, v0 );
 409 }
 410
 411
 412 /**
 413  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 414  * function, then call it.
 415  */
 416 static void _ASMAPI
 417 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 418                             GLvoid *src, const GLvoid *dst,
 419                             GLenum chanType )
 420 {
 421    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 422
 423    _swrast_validate_derived( ctx ); /* why is this needed? */
 424    _swrast_choose_blend_func( ctx, chanType );
 425
 426    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 427 }
 428
 429
 430 /**
 431  * Make sure we have texture image data for all the textures we may need
 432  * for subsequent rendering.
 433  */
 434 static void
 435 _swrast_validate_texture_images(GLcontext *ctx)
 436 {
 437    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 438    GLuint u;
 439
 440    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 441       /* no textures enabled, or no way to validate images! */
 442       return;
 443    }
 444
 445    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 446       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 447          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 448          ASSERT(texObj);
 449          if (texObj) {
 450             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 451             GLuint face;
 452             for (face = 0; face < numFaces; face++) {
 453                GLint lvl;
 454                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 455                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 456                   if (texImg && !texImg->Data) {
 457                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 458                      ASSERT(texObj->Image[face][lvl]->Data);
 459                   }
 460                }
 461             }
 462          }
 463       }
 464    }
 465 }
 466
 467
 468 /**
 469  * Free the texture image data attached to all currently enabled
 470  * textures.  Meant to be called by device drivers when transitioning
 471  * from software to hardware rendering.
 472  */
 473 void
 474 _swrast_eject_texture_images(GLcontext *ctx)
 475 {
 476    GLuint u;
 477
 478    if (!ctx->Texture._EnabledUnits) {
 479       /* no textures enabled */
 480       return;
 481    }
 482
 483    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 484       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 485          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 486          ASSERT(texObj);
 487          if (texObj) {
 488             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 489             GLuint face;
 490             for (face = 0; face < numFaces; face++) {
 491                GLint lvl;
 492                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 493                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 494                   if (texImg && texImg->Data) {
 495                      _mesa_free_texmemory(texImg->Data);
 496                      texImg->Data = NULL;
 497                   }
 498                }
 499             }
 500          }
 501       }
 502    }
 503 }
 504
 505
 506
 507 static void
 508 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 509 {
 510    (void) ctx; (void) new_state;
 511 }
 512
 513
 514 static void
 515 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 516 {
 517    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 518    GLuint i;
 519
 520    swrast->NewState |= new_state;
 521
 522    /* After 10 statechanges without any swrast functions being called,
 523     * put the module to sleep.
 524     */
 525    if (++swrast->StateChanges > 10) {
 526       swrast->InvalidateState = _swrast_sleep;
 527       swrast->NewState = ~0;
 528       new_state = ~0;
 529    }
 530
 531    if (new_state & swrast->InvalidateTriangleMask)
 532       swrast->Triangle = _swrast_validate_triangle;
 533
 534    if (new_state & swrast->InvalidateLineMask)
 535       swrast->Line = _swrast_validate_line;
 536
 537    if (new_state & swrast->InvalidatePointMask)
 538       swrast->Point = _swrast_validate_point;
 539
 540    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 541       swrast->BlendFunc = _swrast_validate_blend_func;
 542
 543    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 544       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 545          swrast->TextureSample[i] = NULL;
 546 }
 547
 548
 549 void
 550 _swrast_update_texture_samplers(GLcontext *ctx)
 551 {
 552    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 553    GLuint u;
 554
 555    if (!swrast)
 556       return; /* pipe hack */
 557
 558    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 559       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 560       /* Note: If tObj is NULL, the sample function will be a simple
 561        * function that just returns opaque black (0,0,0,1).
 562        */
 563       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 564    }
 565 }
 566
 567
 568 /**
 569  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 570  * swrast->_ActiveAtttribMask.
 571  */
 572 static void
 573 _swrast_update_active_attribs(GLcontext *ctx)
 574 {
 575    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 576    GLuint attribsMask;
 577
 578    /*
 579     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 580     */
 581    if (ctx->FragmentProgram._Current) {
 582       /* fragment program/shader */
 583       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 584       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 585    }
 586    else if (ctx->ATIFragmentShader._Enabled) {
 587       attribsMask = ~0;  /* XXX fix me */
 588    }
 589    else {
 590       /* fixed function */
 591       attribsMask = 0x0;
 592
 593 #if CHAN_TYPE == GL_FLOAT
 594       attribsMask |= FRAG_BIT_COL0;
 595 #endif
 596
 597       if (ctx->Fog.ColorSumEnabled ||
 598           (ctx->Light.Enabled &&
 599            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 600          attribsMask |= FRAG_BIT_COL1;
 601       }
 602
 603       if (swrast->_FogEnabled)
 604          attribsMask |= FRAG_BIT_FOGC;
 605
 606       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 607    }
 608
 609    swrast->_ActiveAttribMask = attribsMask;
 610
 611    /* Update _ActiveAttribs[] list */
 612    {
 613       GLuint i, num = 0;
 614       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 615          if (attribsMask & (1 << i)) {
 616             swrast->_ActiveAttribs[num++] = i;
 617             /* how should this attribute be interpolated? */
 618             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 619                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 620             else
 621                swrast->_InterpMode[i] = GL_SMOOTH;
 622          }
 623       }
 624       swrast->_NumActiveAttribs = num;
 625    }
 626 }
 627
 628
 629 void
 630 _swrast_validate_derived( GLcontext *ctx )
 631 {
 632    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 633
 634    if (swrast->NewState) {
 635       if (swrast->NewState & _NEW_POLYGON)
 636          _swrast_update_polygon( ctx );
 637
 638       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 639          _swrast_update_fog_hint( ctx );
 640
 641       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 642          _swrast_update_texture_env( ctx );
 643
 644       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 645          _swrast_update_fog_state( ctx );
 646
 647       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 648          _swrast_update_fragment_program( ctx, swrast->NewState );
 649
 650       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 651          _swrast_update_texture_samplers( ctx );
 652          _swrast_validate_texture_images(ctx);
 653       }
 654
 655       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 656          _swrast_update_deferred_texture(ctx);
 657
 658       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 659          _swrast_update_rasterflags( ctx );
 660
 661       if (swrast->NewState & (_NEW_DEPTH |
 662                               _NEW_FOG |
 663                               _NEW_LIGHT |
 664                               _NEW_PROGRAM |
 665                               _NEW_TEXTURE))
 666          _swrast_update_active_attribs(ctx);
 667
 668       if (swrast->NewState & (_NEW_FOG |
 669                               _NEW_PROGRAM |
 670                               _NEW_LIGHT |
 671                               _NEW_TEXTURE))
 672          _swrast_update_specular_vertex_add(ctx);
 673
 674       swrast->NewState = 0;
 675       swrast->StateChanges = 0;
 676       swrast->InvalidateState = _swrast_invalidate_state;
 677    }
 678 }
 679
 680 #define SWRAST_DEBUG 0
 681
 682 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 683  */
 684 void
 685 _swrast_Quad( GLcontext *ctx,
 686               const SWvertex *v0, const SWvertex *v1,
 687               const SWvertex *v2, const SWvertex *v3 )
 688 {
 689    if (SWRAST_DEBUG) {
 690       _mesa_debug(ctx, "_swrast_Quad\n");
 691       _swrast_print_vertex( ctx, v0 );
 692       _swrast_print_vertex( ctx, v1 );
 693       _swrast_print_vertex( ctx, v2 );
 694       _swrast_print_vertex( ctx, v3 );
 695    }
 696    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 697    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 698 }
 699
 700 void
 701 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 702                   const SWvertex *v1, const SWvertex *v2 )
 703 {
 704    if (SWRAST_DEBUG) {
 705       _mesa_debug(ctx, "_swrast_Triangle\n");
 706       _swrast_print_vertex( ctx, v0 );
 707       _swrast_print_vertex( ctx, v1 );
 708       _swrast_print_vertex( ctx, v2 );
 709    }
 710    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 711 }
 712
 713 void
 714 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 715 {
 716    if (SWRAST_DEBUG) {
 717       _mesa_debug(ctx, "_swrast_Line\n");
 718       _swrast_print_vertex( ctx, v0 );
 719       _swrast_print_vertex( ctx, v1 );
 720    }
 721    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 722 }
 723
 724 void
 725 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 726 {
 727    if (SWRAST_DEBUG) {
 728       _mesa_debug(ctx, "_swrast_Point\n");
 729       _swrast_print_vertex( ctx, v0 );
 730    }
 731    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 732 }
 733
 734 void
 735 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 736 {
 737    if (SWRAST_DEBUG) {
 738       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 739    }
 740    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 741 }
 742
 743 void
 744 _swrast_ResetLineStipple( GLcontext *ctx )
 745 {
 746    if (SWRAST_DEBUG) {
 747       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 748    }
 749    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 750 }
 751
 752 void
 753 _swrast_SetFacing(GLcontext *ctx, GLuint facing)
 754 {
 755    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 756 }
 757
 758 void
 759 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 760 {
 761    if (SWRAST_DEBUG) {
 762       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 763    }
 764    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 765    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 766 }
 767
 768 void
 769 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 770 {
 771    if (SWRAST_DEBUG) {
 772       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 773    }
 774    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 775    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 776 }
 777
 778
 779 GLboolean
 780 _swrast_CreateContext( GLcontext *ctx )
 781 {
 782    GLuint i;
 783    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 784
 785    if (SWRAST_DEBUG) {
 786       _mesa_debug(ctx, "_swrast_CreateContext\n");
 787    }
 788
 789    if (!swrast)
 790       return GL_FALSE;
 791
 792    swrast->NewState = ~0;
 793
 794    swrast->choose_point = _swrast_choose_point;
 795    swrast->choose_line = _swrast_choose_line;
 796    swrast->choose_triangle = _swrast_choose_triangle;
 797
 798    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 799    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 800    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 801
 802    swrast->Point = _swrast_validate_point;
 803    swrast->Line = _swrast_validate_line;
 804    swrast->Triangle = _swrast_validate_triangle;
 805    swrast->InvalidateState = _swrast_sleep;
 806    swrast->BlendFunc = _swrast_validate_blend_func;
 807
 808    swrast->AllowVertexFog = GL_TRUE;
 809    swrast->AllowPixelFog = GL_TRUE;
 810
 811    /* Optimized Accum buffer */
 812    swrast->_IntegerAccumMode = GL_FALSE;
 813    swrast->_IntegerAccumScaler = 0.0;
 814
 815    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 816       swrast->TextureSample[i] = NULL;
 817
 818    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 819    if (!swrast->SpanArrays) {
 820       FREE(swrast);
 821       return GL_FALSE;
 822    }
 823    swrast->SpanArrays->ChanType = CHAN_TYPE;
 824 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 825    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;
 826 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 827    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;
 828 #else
 829    swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 830 #endif
 831
 832    /* init point span buffer */
 833    swrast->PointSpan.primitive = GL_POINT;
 834    swrast->PointSpan.end = 0;
 835    swrast->PointSpan.facing = 0;
 836    swrast->PointSpan.array = swrast->SpanArrays;
 837
 838    swrast->TexelBuffer = (GLfloat *) MALLOC(ctx->Const.MaxTextureImageUnits *
 839                                            MAX_WIDTH * 4 * sizeof(GLfloat));
 840    if (!swrast->TexelBuffer) {
 841       FREE(swrast->SpanArrays);
 842       FREE(swrast);
 843       return GL_FALSE;
 844    }
 845
 846    ctx->swrast_context = swrast;
 847
 848    return GL_TRUE;
 849 }
 850
 851 void
 852 _swrast_DestroyContext( GLcontext *ctx )
 853 {
 854    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 855
 856    if (SWRAST_DEBUG) {
 857       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 858    }
 859
 860    FREE( swrast->SpanArrays );
 861    if (swrast->ZoomedArrays)
 862       FREE( swrast->ZoomedArrays );
 863    FREE( swrast->TexelBuffer );
 864    FREE( swrast );
 865
 866    ctx->swrast_context = 0;
 867 }
 868
 869
 870 struct swrast_device_driver *
 871 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 872 {
 873    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 874    return &swrast->Driver;
 875 }
 876
 877 void
 878 _swrast_flush( GLcontext *ctx )
 879 {
 880    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 881    /* flush any pending fragments from rendering points */
 882    if (swrast->PointSpan.end > 0) {
 883       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 884       swrast->PointSpan.end = 0;
 885    }
 886 }
 887
 888 void
 889 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 890 {
 891    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 892    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 893       _swrast_flush(ctx);
 894    }
 895    swrast->Primitive = prim;
 896 }
 897
 898
 899 void
 900 _swrast_render_start( GLcontext *ctx )
 901 {
 902    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 903    if (swrast->Driver.SpanRenderStart)
 904       swrast->Driver.SpanRenderStart( ctx );
 905    swrast->PointSpan.end = 0;
 906 }
 907
 908 void
 909 _swrast_render_finish( GLcontext *ctx )
 910 {
 911    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 912    if (swrast->Driver.SpanRenderFinish)
 913       swrast->Driver.SpanRenderFinish( ctx );
 914
 915    _swrast_flush(ctx);
 916 }
 917
 918
 919 #define SWRAST_DEBUG_VERTICES 0
 920
 921 void
 922 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 923 {
 924    GLuint i;
 925
 926    if (SWRAST_DEBUG_VERTICES) {
 927       _mesa_debug(ctx, "win %f %f %f %f\n",
 928                   v->attrib[FRAG_ATTRIB_WPOS][0],
 929                   v->attrib[FRAG_ATTRIB_WPOS][1],
 930                   v->attrib[FRAG_ATTRIB_WPOS][2],
 931                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 932
 933       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 934          if (ctx->Texture.Unit[i]._ReallyEnabled)
 935             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 936                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 937                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 938                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 939                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 940
 941 #if CHAN_TYPE == GL_FLOAT
 942       _mesa_debug(ctx, "color %f %f %f %f\n",
 943                   v->color[0], v->color[1], v->color[2], v->color[3]);
 944 #else
 945       _mesa_debug(ctx, "color %d %d %d %d\n",
 946                   v->color[0], v->color[1], v->color[2], v->color[3]);
 947 #endif
 948       _mesa_debug(ctx, "spec %g %g %g %g\n",
 949                   v->attrib[FRAG_ATTRIB_COL1][0],
 950                   v->attrib[FRAG_ATTRIB_COL1][1],
 951                   v->attrib[FRAG_ATTRIB_COL1][2],
 952                   v->attrib[FRAG_ATTRIB_COL1][3]);
 953       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 954       _mesa_debug(ctx, "index %d\n", v->attrib[FRAG_ATTRIB_CI][0]);
 955       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 956       _mesa_debug(ctx, "\n");
 957    }
 958 }