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->_TextureCombinePrimary flag.
 176  */
 177 static void
 178 _swrast_update_texture_env( GLcontext *ctx )
 179 {
 180    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 181    GLuint i;
 182
 183    swrast->_TextureCombinePrimary = GL_FALSE;
 184
 185    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 186       const struct gl_tex_env_combine_state *combine =
 187          ctx->Texture.Unit[i]._CurrentCombine;
 188       GLuint term;
 189       for (term = 0; term < combine->_NumArgsRGB; term++) {
 190          if (combine->SourceRGB[term] == GL_PRIMARY_COLOR) {
 191             swrast->_TextureCombinePrimary = GL_TRUE;
 192             return;
 193          }
 194          if (combine->SourceA[term] == GL_PRIMARY_COLOR) {
 195             swrast->_TextureCombinePrimary = GL_TRUE;
 196             return;
 197          }
 198       }
 199    }
 200 }
 201
 202
 203 /**
 204  * Determine if we can defer texturing/shading until after Z/stencil
 205  * testing.  This potentially allows us to skip texturing/shading for
 206  * lots of fragments.
 207  */
 208 static void
 209 _swrast_update_deferred_texture(GLcontext *ctx)
 210 {
 211    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 212    if (ctx->Color.AlphaEnabled) {
 213       /* alpha test depends on post-texture/shader colors */
 214       swrast->_DeferredTexture = GL_FALSE;
 215    }
 216    else {
 217       const struct gl_fragment_program *fprog
 218          = ctx->FragmentProgram._Current;
 219       if (fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
 220          /* Z comes from fragment program/shader */
 221          swrast->_DeferredTexture = GL_FALSE;
 222       }
 223       else if (fprog && fprog->UsesKill) {
 224          swrast->_DeferredTexture = GL_FALSE;
 225       }
 226       else if (ctx->Query.CurrentOcclusionObject) {
 227          /* occlusion query depends on shader discard/kill results */
 228          swrast->_DeferredTexture = GL_FALSE;
 229       }
 230       else {
 231          swrast->_DeferredTexture = GL_TRUE;
 232       }
 233    }
 234 }
 235
 236
 237 /**
 238  * Update swrast->_FogColor and swrast->_FogEnable values.
 239  */
 240 static void
 241 _swrast_update_fog_state( GLcontext *ctx )
 242 {
 243    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 244    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 245
 246    /* determine if fog is needed, and if so, which fog mode */
 247    swrast->_FogEnabled = GL_FALSE;
 248    if (fp && fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
 249       if (fp->FogOption != GL_NONE) {
 250          swrast->_FogEnabled = GL_TRUE;
 251          swrast->_FogMode = fp->FogOption;
 252       }
 253    }
 254    else if (ctx->Fog.Enabled) {
 255       swrast->_FogEnabled = GL_TRUE;
 256       swrast->_FogMode = ctx->Fog.Mode;
 257    }
 258 }
 259
 260
 261 /**
 262  * Update state for running fragment programs.  Basically, load the
 263  * program parameters with current state values.
 264  */
 265 static void
 266 _swrast_update_fragment_program(GLcontext *ctx, GLbitfield newState)
 267 {
 268    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 269    if (fp) {
 270       _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 271    }
 272 }
 273
 274
 275 /**
 276  * See if we can do early diffuse+specular (primary+secondary) color
 277  * add per vertex instead of per-fragment.
 278  */
 279 static void
 280 _swrast_update_specular_vertex_add(GLcontext *ctx)
 281 {
 282    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 283    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 284       (ctx->Light.Enabled &&
 285        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 286
 287    swrast->SpecularVertexAdd = (separateSpecular
 288                                 && ctx->Texture._EnabledUnits == 0x0
 289                                 && !ctx->FragmentProgram._Current
 290                                 && !ctx->ATIFragmentShader._Enabled);
 291 }
 292
 293
 294 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 295                              _NEW_PROGRAM_CONSTANTS |   \
 296                              _NEW_TEXTURE |             \
 297                              _NEW_HINT |                \
 298                              _NEW_POLYGON )
 299
 300 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 301  */
 302 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 303                               _NEW_RENDERMODE|                  \
 304                               _NEW_POLYGON|                     \
 305                               _NEW_DEPTH|                       \
 306                               _NEW_STENCIL|                     \
 307                               _NEW_COLOR|                       \
 308                               _NEW_TEXTURE|                     \
 309                               _SWRAST_NEW_RASTERMASK|           \
 310                               _NEW_LIGHT|                       \
 311                               _NEW_FOG |                        \
 312                               _DD_NEW_SEPARATE_SPECULAR)
 313
 314 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 315                           _NEW_RENDERMODE|              \
 316                           _NEW_LINE|                    \
 317                           _NEW_TEXTURE|                 \
 318                           _NEW_LIGHT|                   \
 319                           _NEW_FOG|                     \
 320                           _NEW_DEPTH |                  \
 321                           _DD_NEW_SEPARATE_SPECULAR)
 322
 323 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 324                            _NEW_RENDERMODE |            \
 325                            _NEW_POINT |                 \
 326                            _NEW_TEXTURE |               \
 327                            _NEW_LIGHT |                 \
 328                            _NEW_FOG |                   \
 329                            _DD_NEW_SEPARATE_SPECULAR)
 330
 331 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 332
 333 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 334
 335 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 336
 337
 338
 339 /**
 340  * Stub for swrast->Triangle to select a true triangle function
 341  * after a state change.
 342  */
 343 static void
 344 _swrast_validate_triangle( GLcontext *ctx,
 345                            const SWvertex *v0,
 346                            const SWvertex *v1,
 347                            const SWvertex *v2 )
 348 {
 349    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 350
 351    _swrast_validate_derived( ctx );
 352    swrast->choose_triangle( ctx );
 353    ASSERT(swrast->Triangle);
 354
 355    if (swrast->SpecularVertexAdd) {
 356       /* separate specular color, but no texture */
 357       swrast->SpecTriangle = swrast->Triangle;
 358       swrast->Triangle = _swrast_add_spec_terms_triangle;
 359    }
 360
 361    swrast->Triangle( ctx, v0, v1, v2 );
 362 }
 363
 364 /**
 365  * Called via swrast->Line.  Examine current GL state and choose a software
 366  * line routine.  Then call it.
 367  */
 368 static void
 369 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 370 {
 371    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 372
 373    _swrast_validate_derived( ctx );
 374    swrast->choose_line( ctx );
 375    ASSERT(swrast->Line);
 376
 377    if (swrast->SpecularVertexAdd) {
 378       swrast->SpecLine = swrast->Line;
 379       swrast->Line = _swrast_add_spec_terms_line;
 380    }
 381
 382    swrast->Line( ctx, v0, v1 );
 383 }
 384
 385 /**
 386  * Called via swrast->Point.  Examine current GL state and choose a software
 387  * point routine.  Then call it.
 388  */
 389 static void
 390 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 391 {
 392    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 393
 394    _swrast_validate_derived( ctx );
 395    swrast->choose_point( ctx );
 396
 397    if (swrast->SpecularVertexAdd) {
 398       swrast->SpecPoint = swrast->Point;
 399       swrast->Point = _swrast_add_spec_terms_point;
 400    }
 401
 402    swrast->Point( ctx, v0 );
 403 }
 404
 405
 406 /**
 407  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 408  * function, then call it.
 409  */
 410 static void _ASMAPI
 411 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 412                             GLvoid *src, const GLvoid *dst,
 413                             GLenum chanType )
 414 {
 415    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 416
 417    _swrast_validate_derived( ctx ); /* why is this needed? */
 418    _swrast_choose_blend_func( ctx, chanType );
 419
 420    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 421 }
 422
 423
 424 /**
 425  * Make sure we have texture image data for all the textures we may need
 426  * for subsequent rendering.
 427  */
 428 static void
 429 _swrast_validate_texture_images(GLcontext *ctx)
 430 {
 431    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 432    GLuint u;
 433
 434    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 435       /* no textures enabled, or no way to validate images! */
 436       return;
 437    }
 438
 439    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 440       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 441          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 442          ASSERT(texObj);
 443          if (texObj) {
 444             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 445             GLuint face;
 446             for (face = 0; face < numFaces; face++) {
 447                GLint lvl;
 448                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 449                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 450                   if (texImg && !texImg->Data) {
 451                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 452                      ASSERT(texObj->Image[face][lvl]->Data);
 453                   }
 454                }
 455             }
 456          }
 457       }
 458    }
 459 }
 460
 461
 462 /**
 463  * Free the texture image data attached to all currently enabled
 464  * textures.  Meant to be called by device drivers when transitioning
 465  * from software to hardware rendering.
 466  */
 467 void
 468 _swrast_eject_texture_images(GLcontext *ctx)
 469 {
 470    GLuint u;
 471
 472    if (!ctx->Texture._EnabledUnits) {
 473       /* no textures enabled */
 474       return;
 475    }
 476
 477    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 478       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 479          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 480          ASSERT(texObj);
 481          if (texObj) {
 482             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 483             GLuint face;
 484             for (face = 0; face < numFaces; face++) {
 485                GLint lvl;
 486                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 487                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 488                   if (texImg && texImg->Data) {
 489                      _mesa_free_texmemory(texImg->Data);
 490                      texImg->Data = NULL;
 491                   }
 492                }
 493             }
 494          }
 495       }
 496    }
 497 }
 498
 499
 500
 501 static void
 502 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 503 {
 504    (void) ctx; (void) new_state;
 505 }
 506
 507
 508 static void
 509 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 510 {
 511    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 512    GLuint i;
 513
 514    swrast->NewState |= new_state;
 515
 516    /* After 10 statechanges without any swrast functions being called,
 517     * put the module to sleep.
 518     */
 519    if (++swrast->StateChanges > 10) {
 520       swrast->InvalidateState = _swrast_sleep;
 521       swrast->NewState = ~0;
 522       new_state = ~0;
 523    }
 524
 525    if (new_state & swrast->InvalidateTriangleMask)
 526       swrast->Triangle = _swrast_validate_triangle;
 527
 528    if (new_state & swrast->InvalidateLineMask)
 529       swrast->Line = _swrast_validate_line;
 530
 531    if (new_state & swrast->InvalidatePointMask)
 532       swrast->Point = _swrast_validate_point;
 533
 534    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 535       swrast->BlendFunc = _swrast_validate_blend_func;
 536
 537    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 538       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 539          swrast->TextureSample[i] = NULL;
 540 }
 541
 542
 543 void
 544 _swrast_update_texture_samplers(GLcontext *ctx)
 545 {
 546    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 547    GLuint u;
 548
 549    if (!swrast)
 550       return; /* pipe hack */
 551
 552    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 553       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 554       /* Note: If tObj is NULL, the sample function will be a simple
 555        * function that just returns opaque black (0,0,0,1).
 556        */
 557       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 558    }
 559 }
 560
 561
 562 /**
 563  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 564  * swrast->_ActiveAtttribMask.
 565  */
 566 static void
 567 _swrast_update_active_attribs(GLcontext *ctx)
 568 {
 569    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 570    GLuint attribsMask;
 571
 572    /*
 573     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 574     */
 575    if (ctx->FragmentProgram._Current) {
 576       /* fragment program/shader */
 577       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 578       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 579    }
 580    else if (ctx->ATIFragmentShader._Enabled) {
 581       attribsMask = ~0;  /* XXX fix me */
 582    }
 583    else {
 584       /* fixed function */
 585       attribsMask = 0x0;
 586
 587 #if CHAN_TYPE == GL_FLOAT
 588       attribsMask |= FRAG_BIT_COL0;
 589 #endif
 590
 591       if (ctx->Fog.ColorSumEnabled ||
 592           (ctx->Light.Enabled &&
 593            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 594          attribsMask |= FRAG_BIT_COL1;
 595       }
 596
 597       if (swrast->_FogEnabled)
 598          attribsMask |= FRAG_BIT_FOGC;
 599
 600       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 601    }
 602
 603    swrast->_ActiveAttribMask = attribsMask;
 604
 605    /* Update _ActiveAttribs[] list */
 606    {
 607       GLuint i, num = 0;
 608       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 609          if (attribsMask & (1 << i)) {
 610             swrast->_ActiveAttribs[num++] = i;
 611             /* how should this attribute be interpolated? */
 612             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 613                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 614             else
 615                swrast->_InterpMode[i] = GL_SMOOTH;
 616          }
 617       }
 618       swrast->_NumActiveAttribs = num;
 619    }
 620 }
 621
 622
 623 void
 624 _swrast_validate_derived( GLcontext *ctx )
 625 {
 626    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 627
 628    if (swrast->NewState) {
 629       if (swrast->NewState & _NEW_POLYGON)
 630          _swrast_update_polygon( ctx );
 631
 632       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 633          _swrast_update_fog_hint( ctx );
 634
 635       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 636          _swrast_update_texture_env( ctx );
 637
 638       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 639          _swrast_update_fog_state( ctx );
 640
 641       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 642          _swrast_update_fragment_program( ctx, swrast->NewState );
 643
 644       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 645          _swrast_update_texture_samplers( ctx );
 646          _swrast_validate_texture_images(ctx);
 647       }
 648
 649       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 650          _swrast_update_deferred_texture(ctx);
 651
 652       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 653          _swrast_update_rasterflags( ctx );
 654
 655       if (swrast->NewState & (_NEW_DEPTH |
 656                               _NEW_FOG |
 657                               _NEW_LIGHT |
 658                               _NEW_PROGRAM |
 659                               _NEW_TEXTURE))
 660          _swrast_update_active_attribs(ctx);
 661
 662       if (swrast->NewState & (_NEW_FOG |
 663                               _NEW_PROGRAM |
 664                               _NEW_LIGHT |
 665                               _NEW_TEXTURE))
 666          _swrast_update_specular_vertex_add(ctx);
 667
 668       swrast->NewState = 0;
 669       swrast->StateChanges = 0;
 670       swrast->InvalidateState = _swrast_invalidate_state;
 671    }
 672 }
 673
 674 #define SWRAST_DEBUG 0
 675
 676 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 677  */
 678 void
 679 _swrast_Quad( GLcontext *ctx,
 680               const SWvertex *v0, const SWvertex *v1,
 681               const SWvertex *v2, const SWvertex *v3 )
 682 {
 683    if (SWRAST_DEBUG) {
 684       _mesa_debug(ctx, "_swrast_Quad\n");
 685       _swrast_print_vertex( ctx, v0 );
 686       _swrast_print_vertex( ctx, v1 );
 687       _swrast_print_vertex( ctx, v2 );
 688       _swrast_print_vertex( ctx, v3 );
 689    }
 690    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 691    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 692 }
 693
 694 void
 695 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 696                   const SWvertex *v1, const SWvertex *v2 )
 697 {
 698    if (SWRAST_DEBUG) {
 699       _mesa_debug(ctx, "_swrast_Triangle\n");
 700       _swrast_print_vertex( ctx, v0 );
 701       _swrast_print_vertex( ctx, v1 );
 702       _swrast_print_vertex( ctx, v2 );
 703    }
 704    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 705 }
 706
 707 void
 708 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 709 {
 710    if (SWRAST_DEBUG) {
 711       _mesa_debug(ctx, "_swrast_Line\n");
 712       _swrast_print_vertex( ctx, v0 );
 713       _swrast_print_vertex( ctx, v1 );
 714    }
 715    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 716 }
 717
 718 void
 719 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 720 {
 721    if (SWRAST_DEBUG) {
 722       _mesa_debug(ctx, "_swrast_Point\n");
 723       _swrast_print_vertex( ctx, v0 );
 724    }
 725    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 726 }
 727
 728 void
 729 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 730 {
 731    if (SWRAST_DEBUG) {
 732       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 733    }
 734    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 735 }
 736
 737 void
 738 _swrast_ResetLineStipple( GLcontext *ctx )
 739 {
 740    if (SWRAST_DEBUG) {
 741       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 742    }
 743    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 744 }
 745
 746 void
 747 _swrast_SetFacing(GLcontext *ctx, GLuint facing)
 748 {
 749    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 750 }
 751
 752 void
 753 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 754 {
 755    if (SWRAST_DEBUG) {
 756       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 757    }
 758    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 759    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 760 }
 761
 762 void
 763 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 764 {
 765    if (SWRAST_DEBUG) {
 766       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 767    }
 768    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 769    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 770 }
 771
 772
 773 GLboolean
 774 _swrast_CreateContext( GLcontext *ctx )
 775 {
 776    GLuint i;
 777    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 778
 779    if (SWRAST_DEBUG) {
 780       _mesa_debug(ctx, "_swrast_CreateContext\n");
 781    }
 782
 783    if (!swrast)
 784       return GL_FALSE;
 785
 786    swrast->NewState = ~0;
 787
 788    swrast->choose_point = _swrast_choose_point;
 789    swrast->choose_line = _swrast_choose_line;
 790    swrast->choose_triangle = _swrast_choose_triangle;
 791
 792    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 793    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 794    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 795
 796    swrast->Point = _swrast_validate_point;
 797    swrast->Line = _swrast_validate_line;
 798    swrast->Triangle = _swrast_validate_triangle;
 799    swrast->InvalidateState = _swrast_sleep;
 800    swrast->BlendFunc = _swrast_validate_blend_func;
 801
 802    swrast->AllowVertexFog = GL_TRUE;
 803    swrast->AllowPixelFog = GL_TRUE;
 804
 805    /* Optimized Accum buffer */
 806    swrast->_IntegerAccumMode = GL_FALSE;
 807    swrast->_IntegerAccumScaler = 0.0;
 808
 809    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 810       swrast->TextureSample[i] = NULL;
 811
 812    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 813    if (!swrast->SpanArrays) {
 814       FREE(swrast);
 815       return GL_FALSE;
 816    }
 817    swrast->SpanArrays->ChanType = CHAN_TYPE;
 818 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 819    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;
 820 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 821    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;
 822 #else
 823    swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 824 #endif
 825
 826    /* init point span buffer */
 827    swrast->PointSpan.primitive = GL_POINT;
 828    swrast->PointSpan.end = 0;
 829    swrast->PointSpan.facing = 0;
 830    swrast->PointSpan.array = swrast->SpanArrays;
 831
 832    swrast->TexelBuffer = (GLfloat *) MALLOC(ctx->Const.MaxTextureImageUnits *
 833                                            MAX_WIDTH * 4 * sizeof(GLfloat));
 834    if (!swrast->TexelBuffer) {
 835       FREE(swrast->SpanArrays);
 836       FREE(swrast);
 837       return GL_FALSE;
 838    }
 839
 840    ctx->swrast_context = swrast;
 841
 842    return GL_TRUE;
 843 }
 844
 845 void
 846 _swrast_DestroyContext( GLcontext *ctx )
 847 {
 848    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 849
 850    if (SWRAST_DEBUG) {
 851       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 852    }
 853
 854    FREE( swrast->SpanArrays );
 855    if (swrast->ZoomedArrays)
 856       FREE( swrast->ZoomedArrays );
 857    FREE( swrast->TexelBuffer );
 858    FREE( swrast );
 859
 860    ctx->swrast_context = 0;
 861 }
 862
 863
 864 struct swrast_device_driver *
 865 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 866 {
 867    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 868    return &swrast->Driver;
 869 }
 870
 871 void
 872 _swrast_flush( GLcontext *ctx )
 873 {
 874    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 875    /* flush any pending fragments from rendering points */
 876    if (swrast->PointSpan.end > 0) {
 877       if (ctx->Visual.rgbMode) {
 878          _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 879       }
 880       else {
 881          _swrast_write_index_span(ctx, &(swrast->PointSpan));
 882       }
 883       swrast->PointSpan.end = 0;
 884    }
 885 }
 886
 887 void
 888 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 889 {
 890    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 891    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 892       _swrast_flush(ctx);
 893    }
 894    swrast->Primitive = prim;
 895 }
 896
 897
 898 void
 899 _swrast_render_start( GLcontext *ctx )
 900 {
 901    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 902    if (swrast->Driver.SpanRenderStart)
 903       swrast->Driver.SpanRenderStart( ctx );
 904    swrast->PointSpan.end = 0;
 905 }
 906
 907 void
 908 _swrast_render_finish( GLcontext *ctx )
 909 {
 910    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 911    if (swrast->Driver.SpanRenderFinish)
 912       swrast->Driver.SpanRenderFinish( ctx );
 913
 914    _swrast_flush(ctx);
 915 }
 916
 917
 918 #define SWRAST_DEBUG_VERTICES 0
 919
 920 void
 921 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 922 {
 923    GLuint i;
 924
 925    if (SWRAST_DEBUG_VERTICES) {
 926       _mesa_debug(ctx, "win %f %f %f %f\n",
 927                   v->attrib[FRAG_ATTRIB_WPOS][0],
 928                   v->attrib[FRAG_ATTRIB_WPOS][1],
 929                   v->attrib[FRAG_ATTRIB_WPOS][2],
 930                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 931
 932       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 933          if (ctx->Texture.Unit[i]._ReallyEnabled)
 934             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 935                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 936                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 937                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 938                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 939
 940 #if CHAN_TYPE == GL_FLOAT
 941       _mesa_debug(ctx, "color %f %f %f %f\n",
 942                   v->color[0], v->color[1], v->color[2], v->color[3]);
 943 #else
 944       _mesa_debug(ctx, "color %d %d %d %d\n",
 945                   v->color[0], v->color[1], v->color[2], v->color[3]);
 946 #endif
 947       _mesa_debug(ctx, "spec %g %g %g %g\n",
 948                   v->attrib[FRAG_ATTRIB_COL1][0],
 949                   v->attrib[FRAG_ATTRIB_COL1][1],
 950                   v->attrib[FRAG_ATTRIB_COL1][2],
 951                   v->attrib[FRAG_ATTRIB_COL1][3]);
 952       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 953       _mesa_debug(ctx, "index %d\n", v->attrib[FRAG_ATTRIB_CI][0]);
 954       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 955       _mesa_debug(ctx, "\n");
 956    }
 957 }