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( struct gl_context *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( struct gl_context *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( struct gl_context *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( struct gl_context *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(struct gl_context *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( struct gl_context *ctx )
 247 {
 248    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 249    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 250
 251    assert((fp == NULL) || (fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB));
 252
 253    /* determine if fog is needed, and if so, which fog mode */
 254    swrast->_FogEnabled = (fp == NULL && ctx->Fog.Enabled);
 255 }
 256
 257
 258 /**
 259  * Update state for running fragment programs.  Basically, load the
 260  * program parameters with current state values.
 261  */
 262 static void
 263 _swrast_update_fragment_program(struct gl_context *ctx, GLbitfield newState)
 264 {
 265    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 266    if (fp) {
 267       _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 268    }
 269 }
 270
 271
 272 /**
 273  * See if we can do early diffuse+specular (primary+secondary) color
 274  * add per vertex instead of per-fragment.
 275  */
 276 static void
 277 _swrast_update_specular_vertex_add(struct gl_context *ctx)
 278 {
 279    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 280    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 281       (ctx->Light.Enabled &&
 282        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 283
 284    swrast->SpecularVertexAdd = (separateSpecular
 285                                 && ctx->Texture._EnabledUnits == 0x0
 286                                 && !ctx->FragmentProgram._Current
 287                                 && !ctx->ATIFragmentShader._Enabled);
 288 }
 289
 290
 291 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 292                              _NEW_PROGRAM_CONSTANTS |   \
 293                              _NEW_TEXTURE |             \
 294                              _NEW_HINT |                \
 295                              _NEW_POLYGON )
 296
 297 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 298  */
 299 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 300                               _NEW_RENDERMODE|                  \
 301                               _NEW_POLYGON|                     \
 302                               _NEW_DEPTH|                       \
 303                               _NEW_STENCIL|                     \
 304                               _NEW_COLOR|                       \
 305                               _NEW_TEXTURE|                     \
 306                               _SWRAST_NEW_RASTERMASK|           \
 307                               _NEW_LIGHT|                       \
 308                               _NEW_FOG |                        \
 309                               _DD_NEW_SEPARATE_SPECULAR)
 310
 311 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 312                           _NEW_RENDERMODE|              \
 313                           _NEW_LINE|                    \
 314                           _NEW_TEXTURE|                 \
 315                           _NEW_LIGHT|                   \
 316                           _NEW_FOG|                     \
 317                           _NEW_DEPTH |                  \
 318                           _DD_NEW_SEPARATE_SPECULAR)
 319
 320 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 321                            _NEW_RENDERMODE |            \
 322                            _NEW_POINT |                 \
 323                            _NEW_TEXTURE |               \
 324                            _NEW_LIGHT |                 \
 325                            _NEW_FOG |                   \
 326                            _DD_NEW_SEPARATE_SPECULAR)
 327
 328 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 329
 330 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 331
 332 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 333
 334
 335
 336 /**
 337  * Stub for swrast->Triangle to select a true triangle function
 338  * after a state change.
 339  */
 340 static void
 341 _swrast_validate_triangle( struct gl_context *ctx,
 342                            const SWvertex *v0,
 343                            const SWvertex *v1,
 344                            const SWvertex *v2 )
 345 {
 346    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 347
 348    _swrast_validate_derived( ctx );
 349    swrast->choose_triangle( ctx );
 350    ASSERT(swrast->Triangle);
 351
 352    if (swrast->SpecularVertexAdd) {
 353       /* separate specular color, but no texture */
 354       swrast->SpecTriangle = swrast->Triangle;
 355       swrast->Triangle = _swrast_add_spec_terms_triangle;
 356    }
 357
 358    swrast->Triangle( ctx, v0, v1, v2 );
 359 }
 360
 361 /**
 362  * Called via swrast->Line.  Examine current GL state and choose a software
 363  * line routine.  Then call it.
 364  */
 365 static void
 366 _swrast_validate_line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 367 {
 368    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 369
 370    _swrast_validate_derived( ctx );
 371    swrast->choose_line( ctx );
 372    ASSERT(swrast->Line);
 373
 374    if (swrast->SpecularVertexAdd) {
 375       swrast->SpecLine = swrast->Line;
 376       swrast->Line = _swrast_add_spec_terms_line;
 377    }
 378
 379    swrast->Line( ctx, v0, v1 );
 380 }
 381
 382 /**
 383  * Called via swrast->Point.  Examine current GL state and choose a software
 384  * point routine.  Then call it.
 385  */
 386 static void
 387 _swrast_validate_point( struct gl_context *ctx, const SWvertex *v0 )
 388 {
 389    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 390
 391    _swrast_validate_derived( ctx );
 392    swrast->choose_point( ctx );
 393
 394    if (swrast->SpecularVertexAdd) {
 395       swrast->SpecPoint = swrast->Point;
 396       swrast->Point = _swrast_add_spec_terms_point;
 397    }
 398
 399    swrast->Point( ctx, v0 );
 400 }
 401
 402
 403 /**
 404  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 405  * function, then call it.
 406  */
 407 static void _ASMAPI
 408 _swrast_validate_blend_func(struct gl_context *ctx, GLuint n, const GLubyte mask[],
 409                             GLvoid *src, const GLvoid *dst,
 410                             GLenum chanType )
 411 {
 412    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 413
 414    _swrast_validate_derived( ctx ); /* why is this needed? */
 415    _swrast_choose_blend_func( ctx, chanType );
 416
 417    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 418 }
 419
 420
 421 /**
 422  * Make sure we have texture image data for all the textures we may need
 423  * for subsequent rendering.
 424  */
 425 static void
 426 _swrast_validate_texture_images(struct gl_context *ctx)
 427 {
 428    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 429    GLuint u;
 430
 431    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 432       /* no textures enabled, or no way to validate images! */
 433       return;
 434    }
 435
 436    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 437       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 438          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 439          ASSERT(texObj);
 440          if (texObj) {
 441             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 442             GLuint face;
 443             for (face = 0; face < numFaces; face++) {
 444                GLint lvl;
 445                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 446                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 447                   if (texImg && !texImg->Data) {
 448                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 449                      ASSERT(texObj->Image[face][lvl]->Data);
 450                   }
 451                }
 452             }
 453          }
 454       }
 455    }
 456 }
 457
 458
 459 /**
 460  * Free the texture image data attached to all currently enabled
 461  * textures.  Meant to be called by device drivers when transitioning
 462  * from software to hardware rendering.
 463  */
 464 void
 465 _swrast_eject_texture_images(struct gl_context *ctx)
 466 {
 467    GLuint u;
 468
 469    if (!ctx->Texture._EnabledUnits) {
 470       /* no textures enabled */
 471       return;
 472    }
 473
 474    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 475       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 476          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 477          ASSERT(texObj);
 478          if (texObj) {
 479             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 480             GLuint face;
 481             for (face = 0; face < numFaces; face++) {
 482                GLint lvl;
 483                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 484                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 485                   if (texImg && texImg->Data) {
 486                      _mesa_free_texmemory(texImg->Data);
 487                      texImg->Data = NULL;
 488                   }
 489                }
 490             }
 491          }
 492       }
 493    }
 494 }
 495
 496
 497
 498 static void
 499 _swrast_sleep( struct gl_context *ctx, GLbitfield new_state )
 500 {
 501    (void) ctx; (void) new_state;
 502 }
 503
 504
 505 static void
 506 _swrast_invalidate_state( struct gl_context *ctx, GLbitfield new_state )
 507 {
 508    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 509    GLuint i;
 510
 511    swrast->NewState |= new_state;
 512
 513    /* After 10 statechanges without any swrast functions being called,
 514     * put the module to sleep.
 515     */
 516    if (++swrast->StateChanges > 10) {
 517       swrast->InvalidateState = _swrast_sleep;
 518       swrast->NewState = ~0;
 519       new_state = ~0;
 520    }
 521
 522    if (new_state & swrast->InvalidateTriangleMask)
 523       swrast->Triangle = _swrast_validate_triangle;
 524
 525    if (new_state & swrast->InvalidateLineMask)
 526       swrast->Line = _swrast_validate_line;
 527
 528    if (new_state & swrast->InvalidatePointMask)
 529       swrast->Point = _swrast_validate_point;
 530
 531    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 532       swrast->BlendFunc = _swrast_validate_blend_func;
 533
 534    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 535       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 536          swrast->TextureSample[i] = NULL;
 537 }
 538
 539
 540 void
 541 _swrast_update_texture_samplers(struct gl_context *ctx)
 542 {
 543    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 544    GLuint u;
 545
 546    if (!swrast)
 547       return; /* pipe hack */
 548
 549    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 550       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 551       /* Note: If tObj is NULL, the sample function will be a simple
 552        * function that just returns opaque black (0,0,0,1).
 553        */
 554       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 555    }
 556 }
 557
 558
 559 /**
 560  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 561  * swrast->_ActiveAtttribMask.
 562  */
 563 static void
 564 _swrast_update_active_attribs(struct gl_context *ctx)
 565 {
 566    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 567    GLuint attribsMask;
 568
 569    /*
 570     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 571     */
 572    if (ctx->FragmentProgram._Current) {
 573       /* fragment program/shader */
 574       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 575       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 576    }
 577    else if (ctx->ATIFragmentShader._Enabled) {
 578       attribsMask = ~0;  /* XXX fix me */
 579    }
 580    else {
 581       /* fixed function */
 582       attribsMask = 0x0;
 583
 584 #if CHAN_TYPE == GL_FLOAT
 585       attribsMask |= FRAG_BIT_COL0;
 586 #endif
 587
 588       if (ctx->Fog.ColorSumEnabled ||
 589           (ctx->Light.Enabled &&
 590            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 591          attribsMask |= FRAG_BIT_COL1;
 592       }
 593
 594       if (swrast->_FogEnabled)
 595          attribsMask |= FRAG_BIT_FOGC;
 596
 597       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 598    }
 599
 600    swrast->_ActiveAttribMask = attribsMask;
 601
 602    /* Update _ActiveAttribs[] list */
 603    {
 604       GLuint i, num = 0;
 605       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 606          if (attribsMask & (1 << i)) {
 607             swrast->_ActiveAttribs[num++] = i;
 608             /* how should this attribute be interpolated? */
 609             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 610                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 611             else
 612                swrast->_InterpMode[i] = GL_SMOOTH;
 613          }
 614       }
 615       swrast->_NumActiveAttribs = num;
 616    }
 617 }
 618
 619
 620 void
 621 _swrast_validate_derived( struct gl_context *ctx )
 622 {
 623    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 624
 625    if (swrast->NewState) {
 626       if (swrast->NewState & _NEW_POLYGON)
 627          _swrast_update_polygon( ctx );
 628
 629       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 630          _swrast_update_fog_hint( ctx );
 631
 632       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 633          _swrast_update_texture_env( ctx );
 634
 635       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 636          _swrast_update_fog_state( ctx );
 637
 638       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 639          _swrast_update_fragment_program( ctx, swrast->NewState );
 640
 641       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 642          _swrast_update_texture_samplers( ctx );
 643          _swrast_validate_texture_images(ctx);
 644       }
 645
 646       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 647          _swrast_update_deferred_texture(ctx);
 648
 649       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 650          _swrast_update_rasterflags( ctx );
 651
 652       if (swrast->NewState & (_NEW_DEPTH |
 653                               _NEW_FOG |
 654                               _NEW_LIGHT |
 655                               _NEW_PROGRAM |
 656                               _NEW_TEXTURE))
 657          _swrast_update_active_attribs(ctx);
 658
 659       if (swrast->NewState & (_NEW_FOG |
 660                               _NEW_PROGRAM |
 661                               _NEW_LIGHT |
 662                               _NEW_TEXTURE))
 663          _swrast_update_specular_vertex_add(ctx);
 664
 665       swrast->NewState = 0;
 666       swrast->StateChanges = 0;
 667       swrast->InvalidateState = _swrast_invalidate_state;
 668    }
 669 }
 670
 671 #define SWRAST_DEBUG 0
 672
 673 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 674  */
 675 void
 676 _swrast_Quad( struct gl_context *ctx,
 677               const SWvertex *v0, const SWvertex *v1,
 678               const SWvertex *v2, const SWvertex *v3 )
 679 {
 680    if (SWRAST_DEBUG) {
 681       _mesa_debug(ctx, "_swrast_Quad\n");
 682       _swrast_print_vertex( ctx, v0 );
 683       _swrast_print_vertex( ctx, v1 );
 684       _swrast_print_vertex( ctx, v2 );
 685       _swrast_print_vertex( ctx, v3 );
 686    }
 687    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 688    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 689 }
 690
 691 void
 692 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 693                   const SWvertex *v1, const SWvertex *v2 )
 694 {
 695    if (SWRAST_DEBUG) {
 696       _mesa_debug(ctx, "_swrast_Triangle\n");
 697       _swrast_print_vertex( ctx, v0 );
 698       _swrast_print_vertex( ctx, v1 );
 699       _swrast_print_vertex( ctx, v2 );
 700    }
 701    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 702 }
 703
 704 void
 705 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 706 {
 707    if (SWRAST_DEBUG) {
 708       _mesa_debug(ctx, "_swrast_Line\n");
 709       _swrast_print_vertex( ctx, v0 );
 710       _swrast_print_vertex( ctx, v1 );
 711    }
 712    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 713 }
 714
 715 void
 716 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 717 {
 718    if (SWRAST_DEBUG) {
 719       _mesa_debug(ctx, "_swrast_Point\n");
 720       _swrast_print_vertex( ctx, v0 );
 721    }
 722    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 723 }
 724
 725 void
 726 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 727 {
 728    if (SWRAST_DEBUG) {
 729       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 730    }
 731    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 732 }
 733
 734 void
 735 _swrast_ResetLineStipple( struct gl_context *ctx )
 736 {
 737    if (SWRAST_DEBUG) {
 738       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 739    }
 740    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 741 }
 742
 743 void
 744 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 745 {
 746    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 747 }
 748
 749 void
 750 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 751 {
 752    if (SWRAST_DEBUG) {
 753       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 754    }
 755    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 756    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 757 }
 758
 759 void
 760 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 761 {
 762    if (SWRAST_DEBUG) {
 763       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 764    }
 765    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 766    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 767 }
 768
 769
 770 GLboolean
 771 _swrast_CreateContext( struct gl_context *ctx )
 772 {
 773    GLuint i;
 774    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 775
 776    if (SWRAST_DEBUG) {
 777       _mesa_debug(ctx, "_swrast_CreateContext\n");
 778    }
 779
 780    if (!swrast)
 781       return GL_FALSE;
 782
 783    swrast->NewState = ~0;
 784
 785    swrast->choose_point = _swrast_choose_point;
 786    swrast->choose_line = _swrast_choose_line;
 787    swrast->choose_triangle = _swrast_choose_triangle;
 788
 789    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 790    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 791    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 792
 793    swrast->Point = _swrast_validate_point;
 794    swrast->Line = _swrast_validate_line;
 795    swrast->Triangle = _swrast_validate_triangle;
 796    swrast->InvalidateState = _swrast_sleep;
 797    swrast->BlendFunc = _swrast_validate_blend_func;
 798
 799    swrast->AllowVertexFog = GL_TRUE;
 800    swrast->AllowPixelFog = GL_TRUE;
 801
 802    /* Optimized Accum buffer */
 803    swrast->_IntegerAccumMode = GL_FALSE;
 804    swrast->_IntegerAccumScaler = 0.0;
 805
 806    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 807       swrast->TextureSample[i] = NULL;
 808
 809    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 810    if (!swrast->SpanArrays) {
 811       FREE(swrast);
 812       return GL_FALSE;
 813    }
 814    swrast->SpanArrays->ChanType = CHAN_TYPE;
 815 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 816    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;
 817 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 818    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;
 819 #else
 820    swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 821 #endif
 822
 823    /* init point span buffer */
 824    swrast->PointSpan.primitive = GL_POINT;
 825    swrast->PointSpan.end = 0;
 826    swrast->PointSpan.facing = 0;
 827    swrast->PointSpan.array = swrast->SpanArrays;
 828
 829    swrast->TexelBuffer = (GLfloat *) MALLOC(ctx->Const.MaxTextureImageUnits *
 830                                            MAX_WIDTH * 4 * sizeof(GLfloat));
 831    if (!swrast->TexelBuffer) {
 832       FREE(swrast->SpanArrays);
 833       FREE(swrast);
 834       return GL_FALSE;
 835    }
 836
 837    ctx->swrast_context = swrast;
 838
 839    return GL_TRUE;
 840 }
 841
 842 void
 843 _swrast_DestroyContext( struct gl_context *ctx )
 844 {
 845    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 846
 847    if (SWRAST_DEBUG) {
 848       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 849    }
 850
 851    FREE( swrast->SpanArrays );
 852    if (swrast->ZoomedArrays)
 853       FREE( swrast->ZoomedArrays );
 854    FREE( swrast->TexelBuffer );
 855    FREE( swrast );
 856
 857    ctx->swrast_context = 0;
 858 }
 859
 860
 861 struct swrast_device_driver *
 862 _swrast_GetDeviceDriverReference( struct gl_context *ctx )
 863 {
 864    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 865    return &swrast->Driver;
 866 }
 867
 868 void
 869 _swrast_flush( struct gl_context *ctx )
 870 {
 871    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 872    /* flush any pending fragments from rendering points */
 873    if (swrast->PointSpan.end > 0) {
 874       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 875       swrast->PointSpan.end = 0;
 876    }
 877 }
 878
 879 void
 880 _swrast_render_primitive( struct gl_context *ctx, GLenum prim )
 881 {
 882    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 883    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 884       _swrast_flush(ctx);
 885    }
 886    swrast->Primitive = prim;
 887 }
 888
 889
 890 void
 891 _swrast_render_start( struct gl_context *ctx )
 892 {
 893    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 894    if (swrast->Driver.SpanRenderStart)
 895       swrast->Driver.SpanRenderStart( ctx );
 896    swrast->PointSpan.end = 0;
 897 }
 898
 899 void
 900 _swrast_render_finish( struct gl_context *ctx )
 901 {
 902    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 903    if (swrast->Driver.SpanRenderFinish)
 904       swrast->Driver.SpanRenderFinish( ctx );
 905
 906    _swrast_flush(ctx);
 907 }
 908
 909
 910 #define SWRAST_DEBUG_VERTICES 0
 911
 912 void
 913 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 914 {
 915    GLuint i;
 916
 917    if (SWRAST_DEBUG_VERTICES) {
 918       _mesa_debug(ctx, "win %f %f %f %f\n",
 919                   v->attrib[FRAG_ATTRIB_WPOS][0],
 920                   v->attrib[FRAG_ATTRIB_WPOS][1],
 921                   v->attrib[FRAG_ATTRIB_WPOS][2],
 922                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 923
 924       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 925          if (ctx->Texture.Unit[i]._ReallyEnabled)
 926             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 927                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 928                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 929                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 930                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 931
 932 #if CHAN_TYPE == GL_FLOAT
 933       _mesa_debug(ctx, "color %f %f %f %f\n",
 934                   v->color[0], v->color[1], v->color[2], v->color[3]);
 935 #else
 936       _mesa_debug(ctx, "color %d %d %d %d\n",
 937                   v->color[0], v->color[1], v->color[2], v->color[3]);
 938 #endif
 939       _mesa_debug(ctx, "spec %g %g %g %g\n",
 940                   v->attrib[FRAG_ATTRIB_COL1][0],
 941                   v->attrib[FRAG_ATTRIB_COL1][1],
 942                   v->attrib[FRAG_ATTRIB_COL1][2],
 943                   v->attrib[FRAG_ATTRIB_COL1][3]);
 944       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 945       _mesa_debug(ctx, "index %f\n", v->attrib[FRAG_ATTRIB_CI][0]);
 946       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 947       _mesa_debug(ctx, "\n");
 948    }
 949 }