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
  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    if (ctx->Visual.rgbMode) {
  66       const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
  67       if (colorMask != 0xffffffff)        rasterMask |= MASKING_BIT;
  68       if (ctx->Color._LogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  69       if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  70    }
  71    else {
  72       if (ctx->Color.IndexMask != 0xffffffff) rasterMask |= MASKING_BIT;
  73       if (ctx->Color.IndexLogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  74    }
  75
  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    else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
  96       rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
  97    }
  98    else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
  99       rasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
 100    }
 101
 102    if (ctx->FragmentProgram._Current) {
 103       rasterMask |= FRAGPROG_BIT;
 104    }
 105
 106    if (ctx->ATIFragmentShader._Enabled) {
 107       rasterMask |= ATIFRAGSHADER_BIT;
 108    }
 109
 110 #if CHAN_TYPE == GL_FLOAT
 111    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 112       rasterMask |= CLAMPING_BIT;
 113    }
 114 #endif
 115
 116    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 117 }
 118
 119
 120 /**
 121  * Examine polygon cull state to compute the _BackfaceCullSign field.
 122  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 123  * and 1 if culling front-faces.  The Polygon FrontFace state also
 124  * factors in.
 125  */
 126 static void
 127 _swrast_update_polygon( GLcontext *ctx )
 128 {
 129    GLfloat backface_sign;
 130
 131    if (ctx->Polygon.CullFlag) {
 132       switch (ctx->Polygon.CullFaceMode) {
 133       case GL_BACK:
 134          backface_sign = -1.0;
 135          break;
 136       case GL_FRONT:
 137          backface_sign = 1.0;
 138          break;
 139       case GL_FRONT_AND_BACK:
 140          /* fallthrough */
 141       default:
 142          backface_sign = 0.0;
 143       }
 144    }
 145    else {
 146       backface_sign = 0.0;
 147    }
 148
 149    SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
 150
 151    /* This is for front/back-face determination, but not for culling */
 152    SWRAST_CONTEXT(ctx)->_BackfaceSign
 153       = (ctx->Polygon.FrontFace == GL_CW) ? -1.0 : 1.0;
 154 }
 155
 156
 157
 158 /**
 159  * Update the _PreferPixelFog field to indicate if we need to compute
 160  * fog blend factors (from the fog coords) per-fragment.
 161  */
 162 static void
 163 _swrast_update_fog_hint( GLcontext *ctx )
 164 {
 165    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 166    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 167                               ctx->FragmentProgram._Current ||
 168                               (ctx->Hint.Fog == GL_NICEST &&
 169                                swrast->AllowPixelFog));
 170 }
 171
 172
 173
 174 /**
 175  * Update the swrast->_AnyTextureCombine flag.
 176  */
 177 static void
 178 _swrast_update_texture_env( GLcontext *ctx )
 179 {
 180    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 181    GLuint i;
 182    swrast->_AnyTextureCombine = GL_FALSE;
 183    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 184       if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
 185           ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
 186          swrast->_AnyTextureCombine = GL_TRUE;
 187          return;
 188       }
 189    }
 190 }
 191
 192
 193 /**
 194  * Determine if we can defer texturing/shading until after Z/stencil
 195  * testing.  This potentially allows us to skip texturing/shading for
 196  * lots of fragments.
 197  */
 198 static void
 199 _swrast_update_deferred_texture(GLcontext *ctx)
 200 {
 201    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 202    if (ctx->Color.AlphaEnabled) {
 203       /* alpha test depends on post-texture/shader colors */
 204       swrast->_DeferredTexture = GL_FALSE;
 205    }
 206    else {
 207       const struct gl_fragment_program *fprog
 208          = ctx->FragmentProgram._Current;
 209       if (fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
 210          /* Z comes from fragment program/shader */
 211          swrast->_DeferredTexture = GL_FALSE;
 212       }
 213       else if (ctx->Query.CurrentOcclusionObject) {
 214          /* occlusion query depends on shader discard/kill results */
 215          swrast->_DeferredTexture = GL_FALSE;
 216       }
 217       else {
 218          swrast->_DeferredTexture = GL_TRUE;
 219       }
 220    }
 221 }
 222
 223
 224 /**
 225  * Update swrast->_FogColor and swrast->_FogEnable values.
 226  */
 227 static void
 228 _swrast_update_fog_state( GLcontext *ctx )
 229 {
 230    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 231    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 232
 233    /* determine if fog is needed, and if so, which fog mode */
 234    swrast->_FogEnabled = GL_FALSE;
 235    if (fp && fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
 236       if (fp->FogOption != GL_NONE) {
 237          swrast->_FogEnabled = GL_TRUE;
 238          swrast->_FogMode = fp->FogOption;
 239       }
 240    }
 241    else if (ctx->Fog.Enabled) {
 242       swrast->_FogEnabled = GL_TRUE;
 243       swrast->_FogMode = ctx->Fog.Mode;
 244    }
 245 }
 246
 247
 248 /**
 249  * Update state for running fragment programs.  Basically, load the
 250  * program parameters with current state values.
 251  */
 252 static void
 253 _swrast_update_fragment_program(GLcontext *ctx, GLbitfield newState)
 254 {
 255    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 256    if (fp) {
 257 #if 0
 258       /* XXX Need a way to trigger the initial loading of parameters
 259        * even when there's no recent state changes.
 260        */
 261       if (fp->Base.Parameters->StateFlags & newState)
 262 #endif
 263          _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 264    }
 265 }
 266
 267
 268
 269 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 270                              _NEW_TEXTURE |             \
 271                              _NEW_HINT |                \
 272                              _NEW_POLYGON )
 273
 274 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 275  */
 276 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 277                               _NEW_RENDERMODE|                  \
 278                               _NEW_POLYGON|                     \
 279                               _NEW_DEPTH|                       \
 280                               _NEW_STENCIL|                     \
 281                               _NEW_COLOR|                       \
 282                               _NEW_TEXTURE|                     \
 283                               _SWRAST_NEW_RASTERMASK|           \
 284                               _NEW_LIGHT|                       \
 285                               _NEW_FOG |                        \
 286                               _DD_NEW_SEPARATE_SPECULAR)
 287
 288 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 289                           _NEW_RENDERMODE|              \
 290                           _NEW_LINE|                    \
 291                           _NEW_TEXTURE|                 \
 292                           _NEW_LIGHT|                   \
 293                           _NEW_FOG|                     \
 294                           _NEW_DEPTH |                  \
 295                           _DD_NEW_SEPARATE_SPECULAR)
 296
 297 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 298                            _NEW_RENDERMODE |            \
 299                            _NEW_POINT |                 \
 300                            _NEW_TEXTURE |               \
 301                            _NEW_LIGHT |                 \
 302                            _NEW_FOG |                   \
 303                            _DD_NEW_SEPARATE_SPECULAR)
 304
 305 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 306
 307 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 308
 309 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 310
 311
 312
 313 /**
 314  * Stub for swrast->Triangle to select a true triangle function
 315  * after a state change.
 316  */
 317 static void
 318 _swrast_validate_triangle( GLcontext *ctx,
 319                            const SWvertex *v0,
 320                            const SWvertex *v1,
 321                            const SWvertex *v2 )
 322 {
 323    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 324
 325    _swrast_validate_derived( ctx );
 326    swrast->choose_triangle( ctx );
 327    ASSERT(swrast->Triangle);
 328
 329    if (ctx->Texture._EnabledUnits == 0
 330        && NEED_SECONDARY_COLOR(ctx)
 331        && !ctx->FragmentProgram._Current) {
 332       /* separate specular color, but no texture */
 333       swrast->SpecTriangle = swrast->Triangle;
 334       swrast->Triangle = _swrast_add_spec_terms_triangle;
 335    }
 336
 337    swrast->Triangle( ctx, v0, v1, v2 );
 338 }
 339
 340 /**
 341  * Called via swrast->Line.  Examine current GL state and choose a software
 342  * line routine.  Then call it.
 343  */
 344 static void
 345 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 346 {
 347    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 348
 349    _swrast_validate_derived( ctx );
 350    swrast->choose_line( ctx );
 351    ASSERT(swrast->Line);
 352
 353    if (ctx->Texture._EnabledUnits == 0
 354        && NEED_SECONDARY_COLOR(ctx)
 355        && !ctx->FragmentProgram._Current) {
 356       swrast->SpecLine = swrast->Line;
 357       swrast->Line = _swrast_add_spec_terms_line;
 358    }
 359
 360    swrast->Line( ctx, v0, v1 );
 361 }
 362
 363 /**
 364  * Called via swrast->Point.  Examine current GL state and choose a software
 365  * point routine.  Then call it.
 366  */
 367 static void
 368 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 369 {
 370    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 371
 372    _swrast_validate_derived( ctx );
 373    swrast->choose_point( ctx );
 374
 375    if (ctx->Texture._EnabledUnits == 0
 376        && NEED_SECONDARY_COLOR(ctx)
 377        && !ctx->FragmentProgram._Current) {
 378       swrast->SpecPoint = swrast->Point;
 379       swrast->Point = _swrast_add_spec_terms_point;
 380    }
 381
 382    swrast->Point( ctx, v0 );
 383 }
 384
 385
 386 /**
 387  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 388  * function, then call it.
 389  */
 390 static void _ASMAPI
 391 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 392                             GLvoid *src, const GLvoid *dst,
 393                             GLenum chanType )
 394 {
 395    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 396
 397    _swrast_validate_derived( ctx ); /* why is this needed? */
 398    _swrast_choose_blend_func( ctx, chanType );
 399
 400    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 401 }
 402
 403
 404 /**
 405  * Make sure we have texture image data for all the textures we may need
 406  * for subsequent rendering.
 407  */
 408 static void
 409 _swrast_validate_texture_images(GLcontext *ctx)
 410 {
 411    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 412    GLuint u;
 413
 414    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 415       /* no textures enabled, or no way to validate images! */
 416       return;
 417    }
 418
 419    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 420       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 421          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 422          ASSERT(texObj);
 423          if (texObj) {
 424             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 425             GLuint face;
 426             for (face = 0; face < numFaces; face++) {
 427                GLint lvl;
 428                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 429                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 430                   if (texImg && !texImg->Data) {
 431                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 432                      ASSERT(texObj->Image[face][lvl]->Data);
 433                   }
 434                }
 435             }
 436          }
 437       }
 438    }
 439 }
 440
 441
 442 /**
 443  * Free the texture image data attached to all currently enabled
 444  * textures.  Meant to be called by device drivers when transitioning
 445  * from software to hardware rendering.
 446  */
 447 void
 448 _swrast_eject_texture_images(GLcontext *ctx)
 449 {
 450    GLuint u;
 451
 452    if (!ctx->Texture._EnabledUnits) {
 453       /* no textures enabled */
 454       return;
 455    }
 456
 457    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 458       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 459          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 460          ASSERT(texObj);
 461          if (texObj) {
 462             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 463             GLuint face;
 464             for (face = 0; face < numFaces; face++) {
 465                GLint lvl;
 466                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 467                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 468                   if (texImg && texImg->Data) {
 469                      _mesa_free_texmemory(texImg->Data);
 470                      texImg->Data = NULL;
 471                   }
 472                }
 473             }
 474          }
 475       }
 476    }
 477 }
 478
 479
 480
 481 static void
 482 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 483 {
 484    (void) ctx; (void) new_state;
 485 }
 486
 487
 488 static void
 489 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 490 {
 491    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 492    GLuint i;
 493
 494    swrast->NewState |= new_state;
 495
 496    /* After 10 statechanges without any swrast functions being called,
 497     * put the module to sleep.
 498     */
 499    if (++swrast->StateChanges > 10) {
 500       swrast->InvalidateState = _swrast_sleep;
 501       swrast->NewState = ~0;
 502       new_state = ~0;
 503    }
 504
 505    {
 506       const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 507       if (fp && (fp->Base.Parameters->StateFlags & new_state)) {
 508          _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 509       }
 510    }
 511
 512    if (new_state & swrast->InvalidateTriangleMask)
 513       swrast->Triangle = _swrast_validate_triangle;
 514
 515    if (new_state & swrast->InvalidateLineMask)
 516       swrast->Line = _swrast_validate_line;
 517
 518    if (new_state & swrast->InvalidatePointMask)
 519       swrast->Point = _swrast_validate_point;
 520
 521    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 522       swrast->BlendFunc = _swrast_validate_blend_func;
 523
 524    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 525       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 526          swrast->TextureSample[i] = NULL;
 527 }
 528
 529
 530 void
 531 _swrast_update_texture_samplers(GLcontext *ctx)
 532 {
 533    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 534    GLuint u;
 535
 536    if (!swrast)
 537       return; /* pipe hack */
 538
 539    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 540       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 541       /* Note: If tObj is NULL, the sample function will be a simple
 542        * function that just returns opaque black (0,0,0,1).
 543        */
 544       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 545    }
 546 }
 547
 548
 549 /**
 550  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 551  * swrast->_ActiveAtttribMask.
 552  */
 553 static void
 554 _swrast_update_active_attribs(GLcontext *ctx)
 555 {
 556    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 557    GLuint attribsMask;
 558
 559    /*
 560     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 561     */
 562    if (ctx->FragmentProgram._Current) {
 563       /* fragment program/shader */
 564       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 565       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 566    }
 567    else if (ctx->ATIFragmentShader._Enabled) {
 568       attribsMask = ~0;  /* XXX fix me */
 569    }
 570    else {
 571       /* fixed function */
 572       attribsMask = 0x0;
 573
 574 #if CHAN_TYPE == GL_FLOAT
 575       attribsMask |= FRAG_BIT_COL0;
 576 #endif
 577
 578       if (ctx->Fog.ColorSumEnabled ||
 579           (ctx->Light.Enabled &&
 580            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 581          attribsMask |= FRAG_BIT_COL1;
 582       }
 583
 584       if (swrast->_FogEnabled)
 585          attribsMask |= FRAG_BIT_FOGC;
 586
 587       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 588    }
 589
 590    swrast->_ActiveAttribMask = attribsMask;
 591
 592    /* Update _ActiveAttribs[] list */
 593    {
 594       GLuint i, num = 0;
 595       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 596          if (attribsMask & (1 << i)) {
 597             swrast->_ActiveAttribs[num++] = i;
 598             /* how should this attribute be interpolated? */
 599             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 600                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 601             else
 602                swrast->_InterpMode[i] = GL_SMOOTH;
 603          }
 604       }
 605       swrast->_NumActiveAttribs = num;
 606    }
 607 }
 608
 609
 610 void
 611 _swrast_validate_derived( GLcontext *ctx )
 612 {
 613    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 614
 615    if (swrast->NewState) {
 616       if (swrast->NewState & _NEW_POLYGON)
 617          _swrast_update_polygon( ctx );
 618
 619       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 620          _swrast_update_fog_hint( ctx );
 621
 622       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 623          _swrast_update_texture_env( ctx );
 624
 625       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 626          _swrast_update_fog_state( ctx );
 627
 628       if (swrast->NewState & (_NEW_MODELVIEW |
 629                               _NEW_PROJECTION |
 630                               _NEW_TEXTURE_MATRIX |
 631                               _NEW_FOG |
 632                               _NEW_LIGHT |
 633                               _NEW_LINE |
 634                               _NEW_TEXTURE |
 635                               _NEW_TRANSFORM |
 636                               _NEW_POINT |
 637                               _NEW_VIEWPORT |
 638                               _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       swrast->NewState = 0;
 660       swrast->StateChanges = 0;
 661       swrast->InvalidateState = _swrast_invalidate_state;
 662    }
 663 }
 664
 665 #define SWRAST_DEBUG 0
 666
 667 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 668  */
 669 void
 670 _swrast_Quad( GLcontext *ctx,
 671               const SWvertex *v0, const SWvertex *v1,
 672               const SWvertex *v2, const SWvertex *v3 )
 673 {
 674    if (SWRAST_DEBUG) {
 675       _mesa_debug(ctx, "_swrast_Quad\n");
 676       _swrast_print_vertex( ctx, v0 );
 677       _swrast_print_vertex( ctx, v1 );
 678       _swrast_print_vertex( ctx, v2 );
 679       _swrast_print_vertex( ctx, v3 );
 680    }
 681    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 682    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 683 }
 684
 685 void
 686 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 687                   const SWvertex *v1, const SWvertex *v2 )
 688 {
 689    if (SWRAST_DEBUG) {
 690       _mesa_debug(ctx, "_swrast_Triangle\n");
 691       _swrast_print_vertex( ctx, v0 );
 692       _swrast_print_vertex( ctx, v1 );
 693       _swrast_print_vertex( ctx, v2 );
 694    }
 695    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 696 }
 697
 698 void
 699 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 700 {
 701    if (SWRAST_DEBUG) {
 702       _mesa_debug(ctx, "_swrast_Line\n");
 703       _swrast_print_vertex( ctx, v0 );
 704       _swrast_print_vertex( ctx, v1 );
 705    }
 706    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 707 }
 708
 709 void
 710 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 711 {
 712    if (SWRAST_DEBUG) {
 713       _mesa_debug(ctx, "_swrast_Point\n");
 714       _swrast_print_vertex( ctx, v0 );
 715    }
 716    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 717 }
 718
 719 void
 720 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 721 {
 722    if (SWRAST_DEBUG) {
 723       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 724    }
 725    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 726 }
 727
 728 void
 729 _swrast_ResetLineStipple( GLcontext *ctx )
 730 {
 731    if (SWRAST_DEBUG) {
 732       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 733    }
 734    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 735 }
 736
 737 void
 738 _swrast_SetFacing(GLcontext *ctx, GLuint facing)
 739 {
 740    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 741 }
 742
 743 void
 744 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 745 {
 746    if (SWRAST_DEBUG) {
 747       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 748    }
 749    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 750    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 751 }
 752
 753 void
 754 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 755 {
 756    if (SWRAST_DEBUG) {
 757       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 758    }
 759    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 760    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 761 }
 762
 763
 764 GLboolean
 765 _swrast_CreateContext( GLcontext *ctx )
 766 {
 767    GLuint i;
 768    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 769
 770    if (SWRAST_DEBUG) {
 771       _mesa_debug(ctx, "_swrast_CreateContext\n");
 772    }
 773
 774    if (!swrast)
 775       return GL_FALSE;
 776
 777    swrast->NewState = ~0;
 778
 779    swrast->choose_point = _swrast_choose_point;
 780    swrast->choose_line = _swrast_choose_line;
 781    swrast->choose_triangle = _swrast_choose_triangle;
 782
 783    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 784    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 785    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 786
 787    swrast->Point = _swrast_validate_point;
 788    swrast->Line = _swrast_validate_line;
 789    swrast->Triangle = _swrast_validate_triangle;
 790    swrast->InvalidateState = _swrast_sleep;
 791    swrast->BlendFunc = _swrast_validate_blend_func;
 792
 793    swrast->AllowVertexFog = GL_TRUE;
 794    swrast->AllowPixelFog = GL_TRUE;
 795
 796    /* Optimized Accum buffer */
 797    swrast->_IntegerAccumMode = GL_FALSE;
 798    swrast->_IntegerAccumScaler = 0.0;
 799
 800    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 801       swrast->TextureSample[i] = NULL;
 802
 803    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 804    if (!swrast->SpanArrays) {
 805       FREE(swrast);
 806       return GL_FALSE;
 807    }
 808    swrast->SpanArrays->ChanType = CHAN_TYPE;
 809 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 810    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;
 811 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 812    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;
 813 #else
 814    swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 815 #endif
 816
 817    /* init point span buffer */
 818    swrast->PointSpan.primitive = GL_POINT;
 819    swrast->PointSpan.end = 0;
 820    swrast->PointSpan.facing = 0;
 821    swrast->PointSpan.array = swrast->SpanArrays;
 822
 823    swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureImageUnits *
 824                                            MAX_WIDTH * 4 * sizeof(GLchan));
 825    if (!swrast->TexelBuffer) {
 826       FREE(swrast->SpanArrays);
 827       FREE(swrast);
 828       return GL_FALSE;
 829    }
 830
 831    ctx->swrast_context = swrast;
 832
 833    return GL_TRUE;
 834 }
 835
 836 void
 837 _swrast_DestroyContext( GLcontext *ctx )
 838 {
 839    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 840
 841    if (SWRAST_DEBUG) {
 842       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 843    }
 844
 845    FREE( swrast->SpanArrays );
 846    if (swrast->ZoomedArrays)
 847       FREE( swrast->ZoomedArrays );
 848    FREE( swrast->TexelBuffer );
 849    FREE( swrast );
 850
 851    ctx->swrast_context = 0;
 852 }
 853
 854
 855 struct swrast_device_driver *
 856 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 857 {
 858    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 859    return &swrast->Driver;
 860 }
 861
 862 void
 863 _swrast_flush( GLcontext *ctx )
 864 {
 865    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 866    /* flush any pending fragments from rendering points */
 867    if (swrast->PointSpan.end > 0) {
 868       if (ctx->Visual.rgbMode) {
 869          _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 870       }
 871       else {
 872          _swrast_write_index_span(ctx, &(swrast->PointSpan));
 873       }
 874       swrast->PointSpan.end = 0;
 875    }
 876 }
 877
 878 void
 879 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 880 {
 881    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 882    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 883       _swrast_flush(ctx);
 884    }
 885    swrast->Primitive = prim;
 886 }
 887
 888
 889 void
 890 _swrast_render_start( GLcontext *ctx )
 891 {
 892    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 893    if (swrast->Driver.SpanRenderStart)
 894       swrast->Driver.SpanRenderStart( ctx );
 895    swrast->PointSpan.end = 0;
 896 }
 897
 898 void
 899 _swrast_render_finish( GLcontext *ctx )
 900 {
 901    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 902    if (swrast->Driver.SpanRenderFinish)
 903       swrast->Driver.SpanRenderFinish( ctx );
 904
 905    _swrast_flush(ctx);
 906 }
 907
 908
 909 #define SWRAST_DEBUG_VERTICES 0
 910
 911 void
 912 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 913 {
 914    GLuint i;
 915
 916    if (SWRAST_DEBUG_VERTICES) {
 917       _mesa_debug(ctx, "win %f %f %f %f\n",
 918                   v->attrib[FRAG_ATTRIB_WPOS][0],
 919                   v->attrib[FRAG_ATTRIB_WPOS][1],
 920                   v->attrib[FRAG_ATTRIB_WPOS][2],
 921                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 922
 923       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 924          if (ctx->Texture.Unit[i]._ReallyEnabled)
 925             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 926                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 927                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 928                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 929                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 930
 931 #if CHAN_TYPE == GL_FLOAT
 932       _mesa_debug(ctx, "color %f %f %f %f\n",
 933                   v->color[0], v->color[1], v->color[2], v->color[3]);
 934 #else
 935       _mesa_debug(ctx, "color %d %d %d %d\n",
 936                   v->color[0], v->color[1], v->color[2], v->color[3]);
 937 #endif
 938       _mesa_debug(ctx, "spec %g %g %g %g\n",
 939                   v->attrib[FRAG_ATTRIB_COL1][0],
 940                   v->attrib[FRAG_ATTRIB_COL1][1],
 941                   v->attrib[FRAG_ATTRIB_COL1][2],
 942                   v->attrib[FRAG_ATTRIB_COL1][3]);
 943       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 944       _mesa_debug(ctx, "index %d\n", v->attrib[FRAG_ATTRIB_CI][0]);
 945       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 946       _mesa_debug(ctx, "\n");
 947    }
 948 }