src/mesa/swrast/s_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2007  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 "imports.h"
  30 #include "bufferobj.h"
  31 #include "context.h"
  32 #include "colormac.h"
  33 #include "mtypes.h"
  34 #include "teximage.h"
  35 #include "swrast.h"
  36 #include "shader/prog_statevars.h"
  37 #include "s_blend.h"
  38 #include "s_context.h"
  39 #include "s_lines.h"
  40 #include "s_points.h"
  41 #include "s_span.h"
  42 #include "s_triangle.h"
  43 #include "s_texfilter.h"
  44
  45
  46 /**
  47  * Recompute the value of swrast->_RasterMask, etc. according to
  48  * the current context.  The _RasterMask field can be easily tested by
  49  * drivers to determine certain basic GL state (does the primitive need
  50  * stenciling, logic-op, fog, etc?).
  51  */
  52 static void
  53 _swrast_update_rasterflags( GLcontext *ctx )
  54 {
  55    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  56    GLbitfield rasterMask = 0;
  57
  58    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  59    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  60    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  61    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  62    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  63    if (ctx->Stencil.Enabled)              rasterMask |= STENCIL_BIT;
  64    if (ctx->Visual.rgbMode) {
  65       const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
  66       if (colorMask != 0xffffffff)        rasterMask |= MASKING_BIT;
  67       if (ctx->Color._LogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  68       if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  69    }
  70    else {
  71       if (ctx->Color.IndexMask != 0xffffffff) rasterMask |= MASKING_BIT;
  72       if (ctx->Color.IndexLogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  73    }
  74
  75    if (   ctx->Viewport.X < 0
  76        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  77        || ctx->Viewport.Y < 0
  78        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  79       rasterMask |= CLIP_BIT;
  80    }
  81
  82    if (ctx->Query.CurrentOcclusionObject)
  83       rasterMask |= OCCLUSION_BIT;
  84
  85
  86    /* If we're not drawing to exactly one color buffer set the
  87     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  88     * buffers or the RGBA or CI mask disables all writes.
  89     */
  90    if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
  91       /* more than one color buffer designated for writing (or zero buffers) */
  92       rasterMask |= MULTI_DRAW_BIT;
  93    }
  94    else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
  95       rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
  96    }
  97    else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
  98       rasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
  99    }
 100
 101    if (ctx->FragmentProgram._Current) {
 102       rasterMask |= FRAGPROG_BIT;
 103    }
 104
 105    if (ctx->ATIFragmentShader._Enabled) {
 106       rasterMask |= ATIFRAGSHADER_BIT;
 107    }
 108
 109 #if CHAN_TYPE == GL_FLOAT
 110    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 111       rasterMask |= CLAMPING_BIT;
 112    }
 113 #endif
 114
 115    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 116 }
 117
 118
 119 /**
 120  * Examine polygon cull state to compute the _BackfaceCullSign field.
 121  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 122  * and 1 if culling front-faces.  The Polygon FrontFace state also
 123  * factors in.
 124  */
 125 static void
 126 _swrast_update_polygon( GLcontext *ctx )
 127 {
 128    GLfloat backface_sign;
 129
 130    if (ctx->Polygon.CullFlag) {
 131       switch (ctx->Polygon.CullFaceMode) {
 132       case GL_BACK:
 133          backface_sign = -1.0;
 134          break;
 135       case GL_FRONT:
 136          backface_sign = 1.0;
 137          break;
 138       case GL_FRONT_AND_BACK:
 139          /* fallthrough */
 140       default:
 141          backface_sign = 0.0;
 142       }
 143    }
 144    else {
 145       backface_sign = 0.0;
 146    }
 147
 148    SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
 149
 150    /* This is for front/back-face determination, but not for culling */
 151    SWRAST_CONTEXT(ctx)->_BackfaceSign
 152       = (ctx->Polygon.FrontFace == GL_CW) ? -1.0 : 1.0;
 153 }
 154
 155
 156
 157 /**
 158  * Update the _PreferPixelFog field to indicate if we need to compute
 159  * fog blend factors (from the fog coords) per-fragment.
 160  */
 161 static void
 162 _swrast_update_fog_hint( GLcontext *ctx )
 163 {
 164    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 165    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 166                               ctx->FragmentProgram._Current ||
 167                               (ctx->Hint.Fog == GL_NICEST &&
 168                                swrast->AllowPixelFog));
 169 }
 170
 171
 172
 173 /**
 174  * Update the swrast->_AnyTextureCombine flag.
 175  */
 176 static void
 177 _swrast_update_texture_env( GLcontext *ctx )
 178 {
 179    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 180    GLuint i;
 181    swrast->_AnyTextureCombine = GL_FALSE;
 182    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 183       if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
 184           ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
 185          swrast->_AnyTextureCombine = GL_TRUE;
 186          return;
 187       }
 188    }
 189 }
 190
 191
 192 /**
 193  * Determine if we can defer texturing/shading until after Z/stencil
 194  * testing.  This potentially allows us to skip texturing/shading for
 195  * lots of fragments.
 196  */
 197 static void
 198 _swrast_update_deferred_texture(GLcontext *ctx)
 199 {
 200    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 201    if (ctx->Color.AlphaEnabled) {
 202       /* alpha test depends on post-texture/shader colors */
 203       swrast->_DeferredTexture = GL_FALSE;
 204    }
 205    else {
 206       const struct gl_fragment_program *fprog
 207          = ctx->FragmentProgram._Current;
 208       if (fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPR))) {
 209          /* Z comes from fragment program/shader */
 210          swrast->_DeferredTexture = GL_FALSE;
 211       }
 212       else if (ctx->Query.CurrentOcclusionObject) {
 213          /* occlusion query depends on shader discard/kill results */
 214          swrast->_DeferredTexture = GL_FALSE;
 215       }
 216       else {
 217          swrast->_DeferredTexture = GL_TRUE;
 218       }
 219    }
 220 }
 221
 222
 223 /**
 224  * Update swrast->_FogColor and swrast->_FogEnable values.
 225  */
 226 static void
 227 _swrast_update_fog_state( GLcontext *ctx )
 228 {
 229    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 230    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 231
 232    /* determine if fog is needed, and if so, which fog mode */
 233    swrast->_FogEnabled = GL_FALSE;
 234    if (fp && fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
 235       if (fp->FogOption != GL_NONE) {
 236          swrast->_FogEnabled = GL_TRUE;
 237          swrast->_FogMode = fp->FogOption;
 238       }
 239    }
 240    else if (ctx->Fog.Enabled) {
 241       swrast->_FogEnabled = GL_TRUE;
 242       swrast->_FogMode = ctx->Fog.Mode;
 243    }
 244 }
 245
 246
 247 /**
 248  * Update state for running fragment programs.  Basically, load the
 249  * program parameters with current state values.
 250  */
 251 static void
 252 _swrast_update_fragment_program(GLcontext *ctx, GLbitfield newState)
 253 {
 254    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 255    if (fp) {
 256 #if 0
 257       /* XXX Need a way to trigger the initial loading of parameters
 258        * even when there's no recent state changes.
 259        */
 260       if (fp->Base.Parameters->StateFlags & newState)
 261 #endif
 262          _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 263    }
 264 }
 265
 266
 267
 268 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 269                              _NEW_TEXTURE |             \
 270                              _NEW_HINT |                \
 271                              _NEW_POLYGON )
 272
 273 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 274  */
 275 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 276                               _NEW_RENDERMODE|                  \
 277                               _NEW_POLYGON|                     \
 278                               _NEW_DEPTH|                       \
 279                               _NEW_STENCIL|                     \
 280                               _NEW_COLOR|                       \
 281                               _NEW_TEXTURE|                     \
 282                               _SWRAST_NEW_RASTERMASK|           \
 283                               _NEW_LIGHT|                       \
 284                               _NEW_FOG |                        \
 285                               _DD_NEW_SEPARATE_SPECULAR)
 286
 287 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 288                           _NEW_RENDERMODE|              \
 289                           _NEW_LINE|                    \
 290                           _NEW_TEXTURE|                 \
 291                           _NEW_LIGHT|                   \
 292                           _NEW_FOG|                     \
 293                           _NEW_DEPTH |                  \
 294                           _DD_NEW_SEPARATE_SPECULAR)
 295
 296 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 297                            _NEW_RENDERMODE |            \
 298                            _NEW_POINT |                 \
 299                            _NEW_TEXTURE |               \
 300                            _NEW_LIGHT |                 \
 301                            _NEW_FOG |                   \
 302                            _DD_NEW_SEPARATE_SPECULAR)
 303
 304 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 305
 306 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 307
 308 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 309
 310
 311
 312 /**
 313  * Stub for swrast->Triangle to select a true triangle function
 314  * after a state change.
 315  */
 316 static void
 317 _swrast_validate_triangle( GLcontext *ctx,
 318                            const SWvertex *v0,
 319                            const SWvertex *v1,
 320                            const SWvertex *v2 )
 321 {
 322    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 323
 324    _swrast_validate_derived( ctx );
 325    swrast->choose_triangle( ctx );
 326    ASSERT(swrast->Triangle);
 327
 328    if (ctx->Texture._EnabledUnits == 0
 329        && NEED_SECONDARY_COLOR(ctx)
 330        && !ctx->FragmentProgram._Current) {
 331       /* separate specular color, but no texture */
 332       swrast->SpecTriangle = swrast->Triangle;
 333       swrast->Triangle = _swrast_add_spec_terms_triangle;
 334    }
 335
 336    swrast->Triangle( ctx, v0, v1, v2 );
 337 }
 338
 339 /**
 340  * Called via swrast->Line.  Examine current GL state and choose a software
 341  * line routine.  Then call it.
 342  */
 343 static void
 344 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 345 {
 346    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 347
 348    _swrast_validate_derived( ctx );
 349    swrast->choose_line( ctx );
 350    ASSERT(swrast->Line);
 351
 352    if (ctx->Texture._EnabledUnits == 0
 353        && NEED_SECONDARY_COLOR(ctx)
 354        && !ctx->FragmentProgram._Current) {
 355       swrast->SpecLine = swrast->Line;
 356       swrast->Line = _swrast_add_spec_terms_line;
 357    }
 358
 359    swrast->Line( ctx, v0, v1 );
 360 }
 361
 362 /**
 363  * Called via swrast->Point.  Examine current GL state and choose a software
 364  * point routine.  Then call it.
 365  */
 366 static void
 367 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 368 {
 369    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 370
 371    _swrast_validate_derived( ctx );
 372    swrast->choose_point( ctx );
 373
 374    if (ctx->Texture._EnabledUnits == 0
 375        && NEED_SECONDARY_COLOR(ctx)
 376        && !ctx->FragmentProgram._Current) {
 377       swrast->SpecPoint = swrast->Point;
 378       swrast->Point = _swrast_add_spec_terms_point;
 379    }
 380
 381    swrast->Point( ctx, v0 );
 382 }
 383
 384
 385 /**
 386  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 387  * function, then call it.
 388  */
 389 static void _ASMAPI
 390 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 391                             GLvoid *src, const GLvoid *dst,
 392                             GLenum chanType )
 393 {
 394    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 395
 396    _swrast_validate_derived( ctx ); /* why is this needed? */
 397    _swrast_choose_blend_func( ctx, chanType );
 398
 399    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 400 }
 401
 402
 403 /**
 404  * Make sure we have texture image data for all the textures we may need
 405  * for subsequent rendering.
 406  */
 407 static void
 408 _swrast_validate_texture_images(GLcontext *ctx)
 409 {
 410    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 411    GLuint u;
 412
 413    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 414       /* no textures enabled, or no way to validate images! */
 415       return;
 416    }
 417
 418    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 419       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 420          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 421          ASSERT(texObj);
 422          if (texObj) {
 423             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 424             GLuint face;
 425             for (face = 0; face < numFaces; face++) {
 426                GLint lvl;
 427                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 428                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 429                   if (texImg && !texImg->Data) {
 430                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 431                      ASSERT(texObj->Image[face][lvl]->Data);
 432                   }
 433                }
 434             }
 435          }
 436       }
 437    }
 438 }
 439
 440
 441 /**
 442  * Free the texture image data attached to all currently enabled
 443  * textures.  Meant to be called by device drivers when transitioning
 444  * from software to hardware rendering.
 445  */
 446 void
 447 _swrast_eject_texture_images(GLcontext *ctx)
 448 {
 449    GLuint u;
 450
 451    if (!ctx->Texture._EnabledUnits) {
 452       /* no textures enabled */
 453       return;
 454    }
 455
 456    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 457       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 458          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 459          ASSERT(texObj);
 460          if (texObj) {
 461             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 462             GLuint face;
 463             for (face = 0; face < numFaces; face++) {
 464                GLint lvl;
 465                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 466                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 467                   if (texImg && texImg->Data) {
 468                      _mesa_free_texmemory(texImg->Data);
 469                      texImg->Data = NULL;
 470                   }
 471                }
 472             }
 473          }
 474       }
 475    }
 476 }
 477
 478
 479
 480 static void
 481 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 482 {
 483    (void) ctx; (void) new_state;
 484 }
 485
 486
 487 static void
 488 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 489 {
 490    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 491    GLuint i;
 492
 493    swrast->NewState |= new_state;
 494
 495    /* After 10 statechanges without any swrast functions being called,
 496     * put the module to sleep.
 497     */
 498    if (++swrast->StateChanges > 10) {
 499       swrast->InvalidateState = _swrast_sleep;
 500       swrast->NewState = ~0;
 501       new_state = ~0;
 502    }
 503
 504    if (new_state & swrast->InvalidateTriangleMask)
 505       swrast->Triangle = _swrast_validate_triangle;
 506
 507    if (new_state & swrast->InvalidateLineMask)
 508       swrast->Line = _swrast_validate_line;
 509
 510    if (new_state & swrast->InvalidatePointMask)
 511       swrast->Point = _swrast_validate_point;
 512
 513    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 514       swrast->BlendFunc = _swrast_validate_blend_func;
 515
 516    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 517       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 518          swrast->TextureSample[i] = NULL;
 519 }
 520
 521
 522 void
 523 _swrast_update_texture_samplers(GLcontext *ctx)
 524 {
 525    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 526    GLuint u;
 527
 528    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 529       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 530       /* Note: If tObj is NULL, the sample function will be a simple
 531        * function that just returns opaque black (0,0,0,1).
 532        */
 533       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 534    }
 535 }
 536
 537
 538 /**
 539  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 540  * swrast->_ActiveAtttribMask.
 541  */
 542 static void
 543 _swrast_update_active_attribs(GLcontext *ctx)
 544 {
 545    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 546    GLuint attribsMask;
 547
 548    /*
 549     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 550     */
 551    if (ctx->FragmentProgram._Current) {
 552       /* fragment program/shader */
 553       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 554       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 555    }
 556    else if (ctx->ATIFragmentShader._Enabled) {
 557       attribsMask = ~0;  /* XXX fix me */
 558    }
 559    else {
 560       /* fixed function */
 561       attribsMask = 0x0;
 562
 563 #if CHAN_TYPE == GL_FLOAT
 564       attribsMask |= FRAG_BIT_COL0;
 565 #endif
 566
 567       if (ctx->Fog.ColorSumEnabled ||
 568           (ctx->Light.Enabled &&
 569            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 570          attribsMask |= FRAG_BIT_COL1;
 571       }
 572
 573       if (swrast->_FogEnabled)
 574          attribsMask |= FRAG_BIT_FOGC;
 575
 576       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 577    }
 578
 579    swrast->_ActiveAttribMask = attribsMask;
 580
 581    /* Update _ActiveAttribs[] list */
 582    {
 583       GLuint i, num = 0;
 584       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 585          if (attribsMask & (1 << i)) {
 586             swrast->_ActiveAttribs[num++] = i;
 587             /* how should this attribute be interpolated? */
 588             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 589                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 590             else
 591                swrast->_InterpMode[i] = GL_SMOOTH;
 592          }
 593       }
 594       swrast->_NumActiveAttribs = num;
 595    }
 596 }
 597
 598
 599 void
 600 _swrast_validate_derived( GLcontext *ctx )
 601 {
 602    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 603
 604    if (swrast->NewState) {
 605       if (swrast->NewState & _NEW_POLYGON)
 606          _swrast_update_polygon( ctx );
 607
 608       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 609          _swrast_update_fog_hint( ctx );
 610
 611       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 612          _swrast_update_texture_env( ctx );
 613
 614       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 615          _swrast_update_fog_state( ctx );
 616
 617       if (swrast->NewState & (_NEW_MODELVIEW |
 618                               _NEW_PROJECTION |
 619                               _NEW_TEXTURE_MATRIX |
 620                               _NEW_FOG |
 621                               _NEW_LIGHT |
 622                               _NEW_LINE |
 623                               _NEW_TEXTURE |
 624                               _NEW_TRANSFORM |
 625                               _NEW_POINT |
 626                               _NEW_VIEWPORT |
 627                               _NEW_PROGRAM))
 628          _swrast_update_fragment_program( ctx, swrast->NewState );
 629
 630       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 631          _swrast_update_texture_samplers( ctx );
 632          _swrast_validate_texture_images(ctx);
 633       }
 634
 635       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 636          _swrast_update_deferred_texture(ctx);
 637
 638       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 639          _swrast_update_rasterflags( ctx );
 640
 641       if (swrast->NewState & (_NEW_DEPTH |
 642                               _NEW_FOG |
 643                               _NEW_LIGHT |
 644                               _NEW_PROGRAM |
 645                               _NEW_TEXTURE))
 646          _swrast_update_active_attribs(ctx);
 647
 648       swrast->NewState = 0;
 649       swrast->StateChanges = 0;
 650       swrast->InvalidateState = _swrast_invalidate_state;
 651    }
 652 }
 653
 654 #define SWRAST_DEBUG 0
 655
 656 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 657  */
 658 void
 659 _swrast_Quad( GLcontext *ctx,
 660               const SWvertex *v0, const SWvertex *v1,
 661               const SWvertex *v2, const SWvertex *v3 )
 662 {
 663    if (SWRAST_DEBUG) {
 664       _mesa_debug(ctx, "_swrast_Quad\n");
 665       _swrast_print_vertex( ctx, v0 );
 666       _swrast_print_vertex( ctx, v1 );
 667       _swrast_print_vertex( ctx, v2 );
 668       _swrast_print_vertex( ctx, v3 );
 669    }
 670    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 671    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 672 }
 673
 674 void
 675 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 676                   const SWvertex *v1, const SWvertex *v2 )
 677 {
 678    if (SWRAST_DEBUG) {
 679       _mesa_debug(ctx, "_swrast_Triangle\n");
 680       _swrast_print_vertex( ctx, v0 );
 681       _swrast_print_vertex( ctx, v1 );
 682       _swrast_print_vertex( ctx, v2 );
 683    }
 684    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 685 }
 686
 687 void
 688 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 689 {
 690    if (SWRAST_DEBUG) {
 691       _mesa_debug(ctx, "_swrast_Line\n");
 692       _swrast_print_vertex( ctx, v0 );
 693       _swrast_print_vertex( ctx, v1 );
 694    }
 695    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 696 }
 697
 698 void
 699 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 700 {
 701    if (SWRAST_DEBUG) {
 702       _mesa_debug(ctx, "_swrast_Point\n");
 703       _swrast_print_vertex( ctx, v0 );
 704    }
 705    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 706 }
 707
 708 void
 709 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 710 {
 711    if (SWRAST_DEBUG) {
 712       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 713    }
 714    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 715 }
 716
 717 void
 718 _swrast_ResetLineStipple( GLcontext *ctx )
 719 {
 720    if (SWRAST_DEBUG) {
 721       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 722    }
 723    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 724 }
 725
 726 void
 727 _swrast_SetFacing(GLcontext *ctx, GLuint facing)
 728 {
 729    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 730 }
 731
 732 void
 733 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 734 {
 735    if (SWRAST_DEBUG) {
 736       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 737    }
 738    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 739    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 740 }
 741
 742 void
 743 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 744 {
 745    if (SWRAST_DEBUG) {
 746       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 747    }
 748    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 749    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 750 }
 751
 752
 753 GLboolean
 754 _swrast_CreateContext( GLcontext *ctx )
 755 {
 756    GLuint i;
 757    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 758
 759    if (SWRAST_DEBUG) {
 760       _mesa_debug(ctx, "_swrast_CreateContext\n");
 761    }
 762
 763    if (!swrast)
 764       return GL_FALSE;
 765
 766    swrast->NewState = ~0;
 767
 768    swrast->choose_point = _swrast_choose_point;
 769    swrast->choose_line = _swrast_choose_line;
 770    swrast->choose_triangle = _swrast_choose_triangle;
 771
 772    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 773    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 774    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 775
 776    swrast->Point = _swrast_validate_point;
 777    swrast->Line = _swrast_validate_line;
 778    swrast->Triangle = _swrast_validate_triangle;
 779    swrast->InvalidateState = _swrast_sleep;
 780    swrast->BlendFunc = _swrast_validate_blend_func;
 781
 782    swrast->AllowVertexFog = GL_TRUE;
 783    swrast->AllowPixelFog = GL_TRUE;
 784
 785    /* Optimized Accum buffer */
 786    swrast->_IntegerAccumMode = GL_FALSE;
 787    swrast->_IntegerAccumScaler = 0.0;
 788
 789    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 790       swrast->TextureSample[i] = NULL;
 791
 792    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 793    if (!swrast->SpanArrays) {
 794       FREE(swrast);
 795       return GL_FALSE;
 796    }
 797    swrast->SpanArrays->ChanType = CHAN_TYPE;
 798 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 799    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;
 800 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 801    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;
 802 #else
 803    swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 804 #endif
 805
 806    /* init point span buffer */
 807    swrast->PointSpan.primitive = GL_POINT;
 808    swrast->PointSpan.end = 0;
 809    swrast->PointSpan.facing = 0;
 810    swrast->PointSpan.array = swrast->SpanArrays;
 811
 812    swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureImageUnits *
 813                                            MAX_WIDTH * 4 * sizeof(GLchan));
 814    if (!swrast->TexelBuffer) {
 815       FREE(swrast->SpanArrays);
 816       FREE(swrast);
 817       return GL_FALSE;
 818    }
 819
 820    ctx->swrast_context = swrast;
 821
 822    return GL_TRUE;
 823 }
 824
 825 void
 826 _swrast_DestroyContext( GLcontext *ctx )
 827 {
 828    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 829
 830    if (SWRAST_DEBUG) {
 831       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 832    }
 833
 834    FREE( swrast->SpanArrays );
 835    if (swrast->ZoomedArrays)
 836       FREE( swrast->ZoomedArrays );
 837    FREE( swrast->TexelBuffer );
 838    FREE( swrast );
 839
 840    ctx->swrast_context = 0;
 841 }
 842
 843
 844 struct swrast_device_driver *
 845 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 846 {
 847    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 848    return &swrast->Driver;
 849 }
 850
 851 void
 852 _swrast_flush( GLcontext *ctx )
 853 {
 854    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 855    /* flush any pending fragments from rendering points */
 856    if (swrast->PointSpan.end > 0) {
 857       if (ctx->Visual.rgbMode) {
 858          _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 859       }
 860       else {
 861          _swrast_write_index_span(ctx, &(swrast->PointSpan));
 862       }
 863       swrast->PointSpan.end = 0;
 864    }
 865 }
 866
 867 void
 868 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 869 {
 870    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 871    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 872       _swrast_flush(ctx);
 873    }
 874    swrast->Primitive = prim;
 875 }
 876
 877
 878 void
 879 _swrast_render_start( GLcontext *ctx )
 880 {
 881    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 882    if (swrast->Driver.SpanRenderStart)
 883       swrast->Driver.SpanRenderStart( ctx );
 884    swrast->PointSpan.end = 0;
 885 }
 886
 887 void
 888 _swrast_render_finish( GLcontext *ctx )
 889 {
 890    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 891    if (swrast->Driver.SpanRenderFinish)
 892       swrast->Driver.SpanRenderFinish( ctx );
 893
 894    _swrast_flush(ctx);
 895 }
 896
 897
 898 #define SWRAST_DEBUG_VERTICES 0
 899
 900 void
 901 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 902 {
 903    GLuint i;
 904
 905    if (SWRAST_DEBUG_VERTICES) {
 906       _mesa_debug(ctx, "win %f %f %f %f\n",
 907                   v->attrib[FRAG_ATTRIB_WPOS][0],
 908                   v->attrib[FRAG_ATTRIB_WPOS][1],
 909                   v->attrib[FRAG_ATTRIB_WPOS][2],
 910                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 911
 912       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 913          if (ctx->Texture.Unit[i]._ReallyEnabled)
 914             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 915                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 916                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 917                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 918                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 919
 920 #if CHAN_TYPE == GL_FLOAT
 921       _mesa_debug(ctx, "color %f %f %f %f\n",
 922                   v->color[0], v->color[1], v->color[2], v->color[3]);
 923 #else
 924       _mesa_debug(ctx, "color %d %d %d %d\n",
 925                   v->color[0], v->color[1], v->color[2], v->color[3]);
 926 #endif
 927       _mesa_debug(ctx, "spec %g %g %g %g\n",
 928                   v->attrib[FRAG_ATTRIB_COL1][0],
 929                   v->attrib[FRAG_ATTRIB_COL1][1],
 930                   v->attrib[FRAG_ATTRIB_COL1][2],
 931                   v->attrib[FRAG_ATTRIB_COL1][3]);
 932       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 933       _mesa_debug(ctx, "index %d\n", v->attrib[FRAG_ATTRIB_CI][0]);
 934       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 935       _mesa_debug(ctx, "\n");
 936    }
 937 }