src/mesa/swrast/s_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.3
   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 "prog_statevars.h"
  35 #include "teximage.h"
  36 #include "swrast.h"
  37 #include "s_blend.h"
  38 #include "s_context.h"
  39 #include "s_lines.h"
  40 #include "s_points.h"
  41 #include "s_span.h"
  42 #include "s_triangle.h"
  43 #include "s_texfilter.h"
  44
  45
  46 /**
  47  * Recompute the value of swrast->_RasterMask, etc. according to
  48  * the current context.  The _RasterMask field can be easily tested by
  49  * drivers to determine certain basic GL state (does the primitive need
  50  * stenciling, logic-op, fog, etc?).
  51  */
  52 static void
  53 _swrast_update_rasterflags( GLcontext *ctx )
  54 {
  55    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  56    GLbitfield rasterMask = 0;
  57
  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[0] != 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 polycon culls tate to compute the _BackfaceSign field.
 121  * _BackfaceSign 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       backface_sign = 1.0;
 132       switch (ctx->Polygon.CullFaceMode) {
 133       case GL_BACK:
 134          if (ctx->Polygon.FrontFace == GL_CCW)
 135             backface_sign = -1.0;
 136          break;
 137       case GL_FRONT:
 138          if (ctx->Polygon.FrontFace != GL_CCW)
 139             backface_sign = -1.0;
 140          break;
 141       case GL_FRONT_AND_BACK:
 142          /* fallthrough */
 143       default:
 144          backface_sign = 0.0;
 145          break;
 146       }
 147    }
 148    else {
 149       backface_sign = 0.0;
 150    }
 151
 152    SWRAST_CONTEXT(ctx)->_BackfaceSign = backface_sign;
 153 }
 154
 155
 156 /**
 157  * Update the _PreferPixelFog field to indicate if we need to compute
 158  * fog blend factors (from the fog coords) per-fragment.
 159  */
 160 static void
 161 _swrast_update_fog_hint( GLcontext *ctx )
 162 {
 163    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 164    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 165                               ctx->FragmentProgram._Current ||
 166                               (ctx->Hint.Fog == GL_NICEST &&
 167                                swrast->AllowPixelFog));
 168 }
 169
 170
 171
 172 /**
 173  * Update the swrast->_AnyTextureCombine flag.
 174  */
 175 static void
 176 _swrast_update_texture_env( GLcontext *ctx )
 177 {
 178    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 179    GLuint i;
 180    swrast->_AnyTextureCombine = GL_FALSE;
 181    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 182       if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
 183           ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
 184          swrast->_AnyTextureCombine = GL_TRUE;
 185          return;
 186       }
 187    }
 188 }
 189
 190
 191 /**
 192  * Update swrast->_FogColor and swrast->_FogEnable values.
 193  */
 194 static void
 195 _swrast_update_fog_state( GLcontext *ctx )
 196 {
 197    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 198    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 199
 200    /* determine if fog is needed, and if so, which fog mode */
 201    swrast->_FogEnabled = GL_FALSE;
 202    if (fp && fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
 203       if (fp->FogOption != GL_NONE) {
 204          swrast->_FogEnabled = GL_TRUE;
 205          swrast->_FogMode = fp->FogOption;
 206       }
 207    }
 208    else if (ctx->Fog.Enabled) {
 209       swrast->_FogEnabled = GL_TRUE;
 210       swrast->_FogMode = ctx->Fog.Mode;
 211    }
 212 }
 213
 214
 215 /**
 216  * Update state for running fragment programs.  Basically, load the
 217  * program parameters with current state values.
 218  */
 219 static void
 220 _swrast_update_fragment_program(GLcontext *ctx, GLbitfield newState)
 221 {
 222    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 223    if (fp) {
 224 #if 0
 225       /* XXX Need a way to trigger the initial loading of parameters
 226        * even when there's no recent state changes.
 227        */
 228       if (fp->Base.Parameters->StateFlags & newState)
 229 #endif
 230          _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 231    }
 232 }
 233
 234
 235
 236 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 237                              _NEW_TEXTURE |             \
 238                              _NEW_HINT |                \
 239                              _NEW_POLYGON )
 240
 241 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 242  */
 243 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 244                               _NEW_RENDERMODE|                  \
 245                               _NEW_POLYGON|                     \
 246                               _NEW_DEPTH|                       \
 247                               _NEW_STENCIL|                     \
 248                               _NEW_COLOR|                       \
 249                               _NEW_TEXTURE|                     \
 250                               _SWRAST_NEW_RASTERMASK|           \
 251                               _NEW_LIGHT|                       \
 252                               _NEW_FOG |                        \
 253                               _DD_NEW_SEPARATE_SPECULAR)
 254
 255 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 256                           _NEW_RENDERMODE|              \
 257                           _NEW_LINE|                    \
 258                           _NEW_TEXTURE|                 \
 259                           _NEW_LIGHT|                   \
 260                           _NEW_FOG|                     \
 261                           _NEW_DEPTH |                  \
 262                           _DD_NEW_SEPARATE_SPECULAR)
 263
 264 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 265                            _NEW_RENDERMODE |            \
 266                            _NEW_POINT |                 \
 267                            _NEW_TEXTURE |               \
 268                            _NEW_LIGHT |                 \
 269                            _NEW_FOG |                   \
 270                            _DD_NEW_SEPARATE_SPECULAR)
 271
 272 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 273
 274 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 275
 276 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 277
 278
 279
 280 /**
 281  * Stub for swrast->Triangle to select a true triangle function
 282  * after a state change.
 283  */
 284 static void
 285 _swrast_validate_triangle( GLcontext *ctx,
 286                            const SWvertex *v0,
 287                            const SWvertex *v1,
 288                            const SWvertex *v2 )
 289 {
 290    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 291
 292    _swrast_validate_derived( ctx );
 293    swrast->choose_triangle( ctx );
 294    ASSERT(swrast->Triangle);
 295
 296    if (ctx->Texture._EnabledUnits == 0
 297        && NEED_SECONDARY_COLOR(ctx)
 298        && !ctx->FragmentProgram._Current) {
 299       /* separate specular color, but no texture */
 300       swrast->SpecTriangle = swrast->Triangle;
 301       swrast->Triangle = _swrast_add_spec_terms_triangle;
 302    }
 303
 304    swrast->Triangle( ctx, v0, v1, v2 );
 305 }
 306
 307 /**
 308  * Called via swrast->Line.  Examine current GL state and choose a software
 309  * line routine.  Then call it.
 310  */
 311 static void
 312 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 313 {
 314    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 315
 316    _swrast_validate_derived( ctx );
 317    swrast->choose_line( ctx );
 318    ASSERT(swrast->Line);
 319
 320    if (ctx->Texture._EnabledUnits == 0
 321        && NEED_SECONDARY_COLOR(ctx)
 322        && !ctx->FragmentProgram._Current) {
 323       swrast->SpecLine = swrast->Line;
 324       swrast->Line = _swrast_add_spec_terms_line;
 325    }
 326
 327
 328    swrast->Line( ctx, v0, v1 );
 329 }
 330
 331 /**
 332  * Called via swrast->Point.  Examine current GL state and choose a software
 333  * point routine.  Then call it.
 334  */
 335 static void
 336 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 337 {
 338    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 339
 340    _swrast_validate_derived( ctx );
 341    swrast->choose_point( ctx );
 342
 343    if (ctx->Texture._EnabledUnits == 0
 344        && NEED_SECONDARY_COLOR(ctx)
 345        && !ctx->FragmentProgram._Current) {
 346       swrast->SpecPoint = swrast->Point;
 347       swrast->Point = _swrast_add_spec_terms_point;
 348    }
 349
 350    swrast->Point( ctx, v0 );
 351 }
 352
 353
 354 /**
 355  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 356  * function, then call it.
 357  */
 358 static void _ASMAPI
 359 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 360                             GLvoid *src, const GLvoid *dst,
 361                             GLenum chanType )
 362 {
 363    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 364
 365    _swrast_validate_derived( ctx ); /* why is this needed? */
 366    _swrast_choose_blend_func( ctx, chanType );
 367
 368    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 369 }
 370
 371
 372 /**
 373  * Make sure we have texture image data for all the textures we may need
 374  * for subsequent rendering.
 375  */
 376 static void
 377 _swrast_validate_texture_images(GLcontext *ctx)
 378 {
 379    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 380    GLuint u;
 381
 382    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 383       /* no textures enabled, or no way to validate images! */
 384       return;
 385    }
 386
 387    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 388       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 389          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 390          ASSERT(texObj);
 391          if (texObj) {
 392             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 393             GLuint face;
 394             for (face = 0; face < numFaces; face++) {
 395                GLint lvl;
 396                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 397                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 398                   if (texImg && !texImg->Data) {
 399                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 400                      ASSERT(texObj->Image[face][lvl]->Data);
 401                   }
 402                }
 403             }
 404          }
 405       }
 406    }
 407 }
 408
 409
 410 /**
 411  * Free the texture image data attached to all currently enabled
 412  * textures.  Meant to be called by device drivers when transitioning
 413  * from software to hardware rendering.
 414  */
 415 void
 416 _swrast_eject_texture_images(GLcontext *ctx)
 417 {
 418    GLuint u;
 419
 420    if (!ctx->Texture._EnabledUnits) {
 421       /* no textures enabled */
 422       return;
 423    }
 424
 425    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 426       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 427          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 428          ASSERT(texObj);
 429          if (texObj) {
 430             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 431             GLuint face;
 432             for (face = 0; face < numFaces; face++) {
 433                GLint lvl;
 434                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 435                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 436                   if (texImg && texImg->Data) {
 437                      _mesa_free_texmemory(texImg->Data);
 438                      texImg->Data = NULL;
 439                   }
 440                }
 441             }
 442          }
 443       }
 444    }
 445 }
 446
 447
 448
 449 static void
 450 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 451 {
 452    (void) ctx; (void) new_state;
 453 }
 454
 455
 456 static void
 457 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 458 {
 459    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 460    GLuint i;
 461
 462    swrast->NewState |= new_state;
 463
 464    /* After 10 statechanges without any swrast functions being called,
 465     * put the module to sleep.
 466     */
 467    if (++swrast->StateChanges > 10) {
 468       swrast->InvalidateState = _swrast_sleep;
 469       swrast->NewState = ~0;
 470       new_state = ~0;
 471    }
 472
 473    if (new_state & swrast->InvalidateTriangleMask)
 474       swrast->Triangle = _swrast_validate_triangle;
 475
 476    if (new_state & swrast->InvalidateLineMask)
 477       swrast->Line = _swrast_validate_line;
 478
 479    if (new_state & swrast->InvalidatePointMask)
 480       swrast->Point = _swrast_validate_point;
 481
 482    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 483       swrast->BlendFunc = _swrast_validate_blend_func;
 484
 485    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 486       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 487          swrast->TextureSample[i] = NULL;
 488 }
 489
 490
 491 void
 492 _swrast_update_texture_samplers(GLcontext *ctx)
 493 {
 494    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 495    GLuint u;
 496
 497    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 498       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 499       /* Note: If tObj is NULL, the sample function will be a simple
 500        * function that just returns opaque black (0,0,0,1).
 501        */
 502       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 503    }
 504 }
 505
 506
 507 /**
 508  * Update swrast->_ActiveAttribs and swrast->_NumActiveAttribs
 509  */
 510 static void
 511 _swrast_update_fragment_attribs(GLcontext *ctx)
 512 {
 513    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 514    GLuint attribsMask;
 515
 516    if (ctx->FragmentProgram._Current) {
 517       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 518    }
 519    else {
 520       GLuint u;
 521       attribsMask = 0x0;
 522
 523 #if 0 /* not yet */
 524       if (ctx->Depth.Test)
 525          attribsMask |= FRAG_BIT_WPOS;
 526       if (NEED_SECONDARY_COLOR(ctx))
 527          attribsMask |= FRAG_BIT_COL1;
 528 #endif
 529       if (swrast->_FogEnabled)
 530          attribsMask |= FRAG_BIT_FOGC;
 531
 532       for (u = 0; u < ctx->Const.MaxTextureUnits; u++) {
 533          if (ctx->Texture.Unit[u]._ReallyEnabled) {
 534             attribsMask |= FRAG_BIT_TEX(u);
 535          }
 536       }
 537    }
 538
 539    /* don't want to interpolate these generic attribs just yet */
 540    /* XXX temporary */
 541    attribsMask &= ~(FRAG_BIT_WPOS |
 542                     FRAG_BIT_COL0 |
 543                     FRAG_BIT_COL1 |
 544                     FRAG_BIT_FOGC);
 545
 546    /* Update _ActiveAttribs[] list */
 547    {
 548       GLuint i, num = 0;
 549       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 550          if (attribsMask & (1 << i))
 551             swrast->_ActiveAttribs[num++] = i;
 552       }
 553       swrast->_NumActiveAttribs = num;
 554    }
 555 }
 556
 557
 558 /**
 559  * Update the swrast->_ColorOutputsMask which indicates which color
 560  * renderbuffers (aka rendertargets) are being written to by the current
 561  * fragment program.
 562  * We also take glDrawBuffers() into account to skip outputs that are
 563  * set to GL_NONE.
 564  */
 565 static void
 566 _swrast_update_color_outputs(GLcontext *ctx)
 567 {
 568    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 569    const struct gl_framebuffer *fb = ctx->DrawBuffer;
 570
 571    swrast->_ColorOutputsMask = 0;
 572    swrast->_NumColorOutputs = 0;
 573
 574    if (ctx->FragmentProgram._Current) {
 575       const GLbitfield outputsWritten
 576          = ctx->FragmentProgram._Current->Base.OutputsWritten;
 577       GLuint output;
 578       for (output = 0; output < ctx->Const.MaxDrawBuffers; output++) {
 579          if ((outputsWritten & (1 << (FRAG_RESULT_DATA0 + output)))
 580              && (fb->_NumColorDrawBuffers[output] > 0)) {
 581             swrast->_ColorOutputsMask |= (1 << output);
 582             swrast->_NumColorOutputs = output + 1;
 583          }
 584       }
 585    }
 586    if (swrast->_ColorOutputsMask == 0x0) {
 587       /* no fragment program, or frag prog didn't write to gl_FragData[] */
 588       if (fb->_NumColorDrawBuffers[0] > 0) {
 589          swrast->_ColorOutputsMask = 0x1;
 590          swrast->_NumColorOutputs = 1;
 591       }
 592    }
 593 }
 594
 595
 596 void
 597 _swrast_validate_derived( GLcontext *ctx )
 598 {
 599    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 600
 601    if (swrast->NewState) {
 602       if (swrast->NewState & _NEW_POLYGON)
 603          _swrast_update_polygon( ctx );
 604
 605       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 606          _swrast_update_fog_hint( ctx );
 607
 608       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 609          _swrast_update_texture_env( ctx );
 610
 611       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 612          _swrast_update_fog_state( ctx );
 613
 614       if (swrast->NewState & (_NEW_MODELVIEW |
 615                               _NEW_PROJECTION |
 616                               _NEW_TEXTURE_MATRIX |
 617                               _NEW_FOG |
 618                               _NEW_LIGHT |
 619                               _NEW_LINE |
 620                               _NEW_TEXTURE |
 621                               _NEW_TRANSFORM |
 622                               _NEW_POINT |
 623                               _NEW_VIEWPORT |
 624                               _NEW_PROGRAM))
 625          _swrast_update_fragment_program( ctx, swrast->NewState );
 626
 627       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM))
 628          _swrast_update_texture_samplers( ctx );
 629
 630       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM))
 631          _swrast_validate_texture_images( ctx );
 632
 633       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 634          _swrast_update_rasterflags( ctx );
 635
 636       if (swrast->NewState & (_NEW_DEPTH |
 637                               _NEW_FOG |
 638                               _NEW_PROGRAM |
 639                               _NEW_TEXTURE))
 640          _swrast_update_fragment_attribs(ctx);
 641
 642       if (swrast->NewState & (_NEW_PROGRAM | _NEW_BUFFERS))
 643          _swrast_update_color_outputs(ctx);
 644
 645       swrast->NewState = 0;
 646       swrast->StateChanges = 0;
 647       swrast->InvalidateState = _swrast_invalidate_state;
 648    }
 649 }
 650
 651 #define SWRAST_DEBUG 0
 652
 653 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 654  */
 655 void
 656 _swrast_Quad( GLcontext *ctx,
 657               const SWvertex *v0, const SWvertex *v1,
 658               const SWvertex *v2, const SWvertex *v3 )
 659 {
 660    if (SWRAST_DEBUG) {
 661       _mesa_debug(ctx, "_swrast_Quad\n");
 662       _swrast_print_vertex( ctx, v0 );
 663       _swrast_print_vertex( ctx, v1 );
 664       _swrast_print_vertex( ctx, v2 );
 665       _swrast_print_vertex( ctx, v3 );
 666    }
 667    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 668    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 669 }
 670
 671 void
 672 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 673                   const SWvertex *v1, const SWvertex *v2 )
 674 {
 675    if (SWRAST_DEBUG) {
 676       _mesa_debug(ctx, "_swrast_Triangle\n");
 677       _swrast_print_vertex( ctx, v0 );
 678       _swrast_print_vertex( ctx, v1 );
 679       _swrast_print_vertex( ctx, v2 );
 680    }
 681    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 682 }
 683
 684 void
 685 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 686 {
 687    if (SWRAST_DEBUG) {
 688       _mesa_debug(ctx, "_swrast_Line\n");
 689       _swrast_print_vertex( ctx, v0 );
 690       _swrast_print_vertex( ctx, v1 );
 691    }
 692    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 693 }
 694
 695 void
 696 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 697 {
 698    if (SWRAST_DEBUG) {
 699       _mesa_debug(ctx, "_swrast_Point\n");
 700       _swrast_print_vertex( ctx, v0 );
 701    }
 702    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 703 }
 704
 705 void
 706 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 707 {
 708    if (SWRAST_DEBUG) {
 709       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 710    }
 711    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 712 }
 713
 714 void
 715 _swrast_ResetLineStipple( GLcontext *ctx )
 716 {
 717    if (SWRAST_DEBUG) {
 718       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 719    }
 720    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 721 }
 722
 723 void
 724 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 725 {
 726    if (SWRAST_DEBUG) {
 727       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 728    }
 729    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 730    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 731 }
 732
 733 void
 734 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 735 {
 736    if (SWRAST_DEBUG) {
 737       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 738    }
 739    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 740    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 741 }
 742
 743
 744 GLboolean
 745 _swrast_CreateContext( GLcontext *ctx )
 746 {
 747    GLuint i;
 748    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 749
 750    if (SWRAST_DEBUG) {
 751       _mesa_debug(ctx, "_swrast_CreateContext\n");
 752    }
 753
 754    if (!swrast)
 755       return GL_FALSE;
 756
 757    swrast->NewState = ~0;
 758
 759    swrast->choose_point = _swrast_choose_point;
 760    swrast->choose_line = _swrast_choose_line;
 761    swrast->choose_triangle = _swrast_choose_triangle;
 762
 763    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 764    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 765    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 766
 767    swrast->Point = _swrast_validate_point;
 768    swrast->Line = _swrast_validate_line;
 769    swrast->Triangle = _swrast_validate_triangle;
 770    swrast->InvalidateState = _swrast_sleep;
 771    swrast->BlendFunc = _swrast_validate_blend_func;
 772
 773    swrast->AllowVertexFog = GL_TRUE;
 774    swrast->AllowPixelFog = GL_TRUE;
 775
 776    /* Optimized Accum buffer */
 777    swrast->_IntegerAccumMode = GL_FALSE;
 778    swrast->_IntegerAccumScaler = 0.0;
 779
 780    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 781       swrast->TextureSample[i] = NULL;
 782
 783    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 784    if (!swrast->SpanArrays) {
 785       FREE(swrast);
 786       return GL_FALSE;
 787    }
 788    swrast->SpanArrays->ChanType = CHAN_TYPE;
 789 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 790    swrast->SpanArrays->rgba = swrast->SpanArrays->color.sz1.rgba;
 791    swrast->SpanArrays->spec = swrast->SpanArrays->color.sz1.spec;
 792 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 793    swrast->SpanArrays->rgba = swrast->SpanArrays->color.sz2.rgba;
 794    swrast->SpanArrays->spec = swrast->SpanArrays->color.sz2.spec;
 795 #else
 796    swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 797    swrast->SpanArrays->spec = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL1];
 798 #endif
 799
 800    /* init point span buffer */
 801    swrast->PointSpan.primitive = GL_POINT;
 802    swrast->PointSpan.end = 0;
 803    swrast->PointSpan.facing = 0;
 804    swrast->PointSpan.array = swrast->SpanArrays;
 805
 806    swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureImageUnits *
 807                                            MAX_WIDTH * 4 * sizeof(GLchan));
 808    if (!swrast->TexelBuffer) {
 809       FREE(swrast->SpanArrays);
 810       FREE(swrast);
 811       return GL_FALSE;
 812    }
 813
 814    ctx->swrast_context = swrast;
 815
 816    return GL_TRUE;
 817 }
 818
 819 void
 820 _swrast_DestroyContext( GLcontext *ctx )
 821 {
 822    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 823
 824    if (SWRAST_DEBUG) {
 825       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 826    }
 827
 828    FREE( swrast->SpanArrays );
 829    FREE( swrast->TexelBuffer );
 830    FREE( swrast );
 831
 832    ctx->swrast_context = 0;
 833 }
 834
 835
 836 struct swrast_device_driver *
 837 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 838 {
 839    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 840    return &swrast->Driver;
 841 }
 842
 843 void
 844 _swrast_flush( GLcontext *ctx )
 845 {
 846    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 847    /* flush any pending fragments from rendering points */
 848    if (swrast->PointSpan.end > 0) {
 849       if (ctx->Visual.rgbMode) {
 850          _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 851       }
 852       else {
 853          _swrast_write_index_span(ctx, &(swrast->PointSpan));
 854       }
 855       swrast->PointSpan.end = 0;
 856    }
 857 }
 858
 859 void
 860 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 861 {
 862    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 863    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 864       _swrast_flush(ctx);
 865    }
 866    swrast->Primitive = prim;
 867 }
 868
 869
 870 void
 871 _swrast_render_start( GLcontext *ctx )
 872 {
 873    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 874    if (swrast->Driver.SpanRenderStart)
 875       swrast->Driver.SpanRenderStart( ctx );
 876    swrast->PointSpan.end = 0;
 877 }
 878
 879 void
 880 _swrast_render_finish( GLcontext *ctx )
 881 {
 882    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 883    if (swrast->Driver.SpanRenderFinish)
 884       swrast->Driver.SpanRenderFinish( ctx );
 885
 886    _swrast_flush(ctx);
 887 }
 888
 889
 890 #define SWRAST_DEBUG_VERTICES 0
 891
 892 void
 893 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 894 {
 895    GLuint i;
 896
 897    if (SWRAST_DEBUG_VERTICES) {
 898       _mesa_debug(ctx, "win %f %f %f %f\n",
 899                   v->win[0], v->win[1], v->win[2], v->win[3]);
 900
 901       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 902          if (ctx->Texture.Unit[i]._ReallyEnabled)
 903             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 904                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 905                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 906                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 907                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 908
 909 #if CHAN_TYPE == GL_FLOAT
 910       _mesa_debug(ctx, "color %f %f %f %f\n",
 911                   v->color[0], v->color[1], v->color[2], v->color[3]);
 912       _mesa_debug(ctx, "spec %f %f %f %f\n",
 913                   v->specular[0], v->specular[1],
 914                   v->specular[2], v->specular[3]);
 915 #else
 916       _mesa_debug(ctx, "color %d %d %d %d\n",
 917                   v->color[0], v->color[1], v->color[2], v->color[3]);
 918       _mesa_debug(ctx, "spec %d %d %d %d\n",
 919                   v->specular[0], v->specular[1],
 920                   v->specular[2], v->specular[3]);
 921 #endif
 922       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 923       _mesa_debug(ctx, "index %d\n", v->index);
 924       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 925       _mesa_debug(ctx, "\n");
 926    }
 927 }