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