src/mesa/swrast/s_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   4  *
   5  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Keith Whitwell <keith@tungstengraphics.com>
  26  *    Brian Paul
  27  */
  28
  29 #include "main/imports.h"
  30 #include "bufferobj.h"
  31 #include "main/context.h"
  32 #include "main/colormac.h"
  33 #include "main/mtypes.h"
  34 #include "teximage.h"
  35 #include "swrast.h"
  36 #include "shader/prog_statevars.h"
  37 #include "s_blend.h"
  38 #include "s_context.h"
  39 #include "s_lines.h"
  40 #include "s_points.h"
  41 #include "s_span.h"
  42 #include "s_triangle.h"
  43 #include "s_texfilter.h"
  44
  45
  46 /**
  47  * Recompute the value of swrast->_RasterMask, etc. according to
  48  * the current context.  The _RasterMask field can be easily tested by
  49  * drivers to determine certain basic GL state (does the primitive need
  50  * stenciling, logic-op, fog, etc?).
  51  */
  52 static void
  53 _swrast_update_rasterflags( GLcontext *ctx )
  54 {
  55    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  56    GLbitfield rasterMask = 0;
  57
  58    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  59    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  60    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  61    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  62    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  63    if (ctx->Stencil.Enabled)              rasterMask |= STENCIL_BIT;
  64    if (ctx->Visual.rgbMode) {
  65       const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
  66       if (colorMask != 0xffffffff)        rasterMask |= MASKING_BIT;
  67       if (ctx->Color._LogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  68       if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  69    }
  70    else {
  71       if (ctx->Color.IndexMask != 0xffffffff) rasterMask |= MASKING_BIT;
  72       if (ctx->Color.IndexLogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  73    }
  74
  75    if (   ctx->Viewport.X < 0
  76        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  77        || ctx->Viewport.Y < 0
  78        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  79       rasterMask |= CLIP_BIT;
  80    }
  81
  82    if (ctx->Query.CurrentOcclusionObject)
  83       rasterMask |= OCCLUSION_BIT;
  84
  85
  86    /* If we're not drawing to exactly one color buffer set the
  87     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  88     * buffers or the RGBA or CI mask disables all writes.
  89     */
  90    if (ctx->DrawBuffer->_NumColorDrawBuffers[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  * Determine if we can defer texturing/shading until after Z/stencil
 193  * testing.  This potentially allows us to skip texturing/shading for
 194  * lots of fragments.
 195  */
 196 static void
 197 _swrast_update_deferred_texture(GLcontext *ctx)
 198 {
 199    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 200    if (ctx->Color.AlphaEnabled) {
 201       /* alpha test depends on post-texture/shader colors */
 202       swrast->_DeferredTexture = GL_FALSE;
 203    }
 204    else {
 205       const struct gl_fragment_program *fprog
 206          = ctx->FragmentProgram._Current;
 207       if (fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPR))) {
 208          /* Z comes from fragment program/shader */
 209          swrast->_DeferredTexture = GL_FALSE;
 210       }
 211       else if (ctx->Query.CurrentOcclusionObject) {
 212          /* occlusion query depends on shader discard/kill results */
 213          swrast->_DeferredTexture = GL_FALSE;
 214       }
 215       else {
 216          swrast->_DeferredTexture = GL_TRUE;
 217       }
 218    }
 219 }
 220
 221
 222 /**
 223  * Update swrast->_FogColor and swrast->_FogEnable values.
 224  */
 225 static void
 226 _swrast_update_fog_state( GLcontext *ctx )
 227 {
 228    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 229    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 230
 231    /* determine if fog is needed, and if so, which fog mode */
 232    swrast->_FogEnabled = GL_FALSE;
 233    if (fp && fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) {
 234       if (fp->FogOption != GL_NONE) {
 235          swrast->_FogEnabled = GL_TRUE;
 236          swrast->_FogMode = fp->FogOption;
 237       }
 238    }
 239    else if (ctx->Fog.Enabled) {
 240       swrast->_FogEnabled = GL_TRUE;
 241       swrast->_FogMode = ctx->Fog.Mode;
 242    }
 243 }
 244
 245
 246 /**
 247  * Update state for running fragment programs.  Basically, load the
 248  * program parameters with current state values.
 249  */
 250 static void
 251 _swrast_update_fragment_program(GLcontext *ctx, GLbitfield newState)
 252 {
 253    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 254    if (fp) {
 255 #if 0
 256       /* XXX Need a way to trigger the initial loading of parameters
 257        * even when there's no recent state changes.
 258        */
 259       if (fp->Base.Parameters->StateFlags & newState)
 260 #endif
 261          _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 262    }
 263 }
 264
 265
 266
 267 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 268                              _NEW_TEXTURE |             \
 269                              _NEW_HINT |                \
 270                              _NEW_POLYGON )
 271
 272 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 273  */
 274 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 275                               _NEW_RENDERMODE|                  \
 276                               _NEW_POLYGON|                     \
 277                               _NEW_DEPTH|                       \
 278                               _NEW_STENCIL|                     \
 279                               _NEW_COLOR|                       \
 280                               _NEW_TEXTURE|                     \
 281                               _SWRAST_NEW_RASTERMASK|           \
 282                               _NEW_LIGHT|                       \
 283                               _NEW_FOG |                        \
 284                               _DD_NEW_SEPARATE_SPECULAR)
 285
 286 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 287                           _NEW_RENDERMODE|              \
 288                           _NEW_LINE|                    \
 289                           _NEW_TEXTURE|                 \
 290                           _NEW_LIGHT|                   \
 291                           _NEW_FOG|                     \
 292                           _NEW_DEPTH |                  \
 293                           _DD_NEW_SEPARATE_SPECULAR)
 294
 295 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 296                            _NEW_RENDERMODE |            \
 297                            _NEW_POINT |                 \
 298                            _NEW_TEXTURE |               \
 299                            _NEW_LIGHT |                 \
 300                            _NEW_FOG |                   \
 301                            _DD_NEW_SEPARATE_SPECULAR)
 302
 303 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 304
 305 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 306
 307 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 308
 309
 310
 311 /**
 312  * Stub for swrast->Triangle to select a true triangle function
 313  * after a state change.
 314  */
 315 static void
 316 _swrast_validate_triangle( GLcontext *ctx,
 317                            const SWvertex *v0,
 318                            const SWvertex *v1,
 319                            const SWvertex *v2 )
 320 {
 321    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 322
 323    _swrast_validate_derived( ctx );
 324    swrast->choose_triangle( ctx );
 325    ASSERT(swrast->Triangle);
 326
 327    if (ctx->Texture._EnabledUnits == 0
 328        && NEED_SECONDARY_COLOR(ctx)
 329        && !ctx->FragmentProgram._Current) {
 330       /* separate specular color, but no texture */
 331       swrast->SpecTriangle = swrast->Triangle;
 332       swrast->Triangle = _swrast_add_spec_terms_triangle;
 333    }
 334
 335    swrast->Triangle( ctx, v0, v1, v2 );
 336 }
 337
 338 /**
 339  * Called via swrast->Line.  Examine current GL state and choose a software
 340  * line routine.  Then call it.
 341  */
 342 static void
 343 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 344 {
 345    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 346
 347    _swrast_validate_derived( ctx );
 348    swrast->choose_line( ctx );
 349    ASSERT(swrast->Line);
 350
 351    if (ctx->Texture._EnabledUnits == 0
 352        && NEED_SECONDARY_COLOR(ctx)
 353        && !ctx->FragmentProgram._Current) {
 354       swrast->SpecLine = swrast->Line;
 355       swrast->Line = _swrast_add_spec_terms_line;
 356    }
 357
 358    swrast->Line( ctx, v0, v1 );
 359 }
 360
 361 /**
 362  * Called via swrast->Point.  Examine current GL state and choose a software
 363  * point routine.  Then call it.
 364  */
 365 static void
 366 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 367 {
 368    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 369
 370    _swrast_validate_derived( ctx );
 371    swrast->choose_point( ctx );
 372
 373    if (ctx->Texture._EnabledUnits == 0
 374        && NEED_SECONDARY_COLOR(ctx)
 375        && !ctx->FragmentProgram._Current) {
 376       swrast->SpecPoint = swrast->Point;
 377       swrast->Point = _swrast_add_spec_terms_point;
 378    }
 379
 380    swrast->Point( ctx, v0 );
 381 }
 382
 383
 384 /**
 385  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 386  * function, then call it.
 387  */
 388 static void _ASMAPI
 389 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 390                             GLvoid *src, const GLvoid *dst,
 391                             GLenum chanType )
 392 {
 393    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 394
 395    _swrast_validate_derived( ctx ); /* why is this needed? */
 396    _swrast_choose_blend_func( ctx, chanType );
 397
 398    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 399 }
 400
 401
 402 /**
 403  * Make sure we have texture image data for all the textures we may need
 404  * for subsequent rendering.
 405  */
 406 static void
 407 _swrast_validate_texture_images(GLcontext *ctx)
 408 {
 409    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 410    GLuint u;
 411
 412    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 413       /* no textures enabled, or no way to validate images! */
 414       return;
 415    }
 416
 417    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 418       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 419          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 420          ASSERT(texObj);
 421          if (texObj) {
 422             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 423             GLuint face;
 424             for (face = 0; face < numFaces; face++) {
 425                GLint lvl;
 426                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 427                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 428                   if (texImg && !texImg->Data) {
 429                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 430                      ASSERT(texObj->Image[face][lvl]->Data);
 431                   }
 432                }
 433             }
 434          }
 435       }
 436    }
 437 }
 438
 439
 440 /**
 441  * Free the texture image data attached to all currently enabled
 442  * textures.  Meant to be called by device drivers when transitioning
 443  * from software to hardware rendering.
 444  */
 445 void
 446 _swrast_eject_texture_images(GLcontext *ctx)
 447 {
 448    GLuint u;
 449
 450    if (!ctx->Texture._EnabledUnits) {
 451       /* no textures enabled */
 452       return;
 453    }
 454
 455    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 456       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 457          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 458          ASSERT(texObj);
 459          if (texObj) {
 460             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 461             GLuint face;
 462             for (face = 0; face < numFaces; face++) {
 463                GLint lvl;
 464                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 465                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 466                   if (texImg && texImg->Data) {
 467                      _mesa_free_texmemory(texImg->Data);
 468                      texImg->Data = NULL;
 469                   }
 470                }
 471             }
 472          }
 473       }
 474    }
 475 }
 476
 477
 478
 479 static void
 480 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 481 {
 482    (void) ctx; (void) new_state;
 483 }
 484
 485
 486 static void
 487 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 488 {
 489    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 490    GLuint i;
 491
 492    swrast->NewState |= new_state;
 493
 494    /* After 10 statechanges without any swrast functions being called,
 495     * put the module to sleep.
 496     */
 497    if (++swrast->StateChanges > 10) {
 498       swrast->InvalidateState = _swrast_sleep;
 499       swrast->NewState = ~0;
 500       new_state = ~0;
 501    }
 502
 503    if (new_state & swrast->InvalidateTriangleMask)
 504       swrast->Triangle = _swrast_validate_triangle;
 505
 506    if (new_state & swrast->InvalidateLineMask)
 507       swrast->Line = _swrast_validate_line;
 508
 509    if (new_state & swrast->InvalidatePointMask)
 510       swrast->Point = _swrast_validate_point;
 511
 512    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 513       swrast->BlendFunc = _swrast_validate_blend_func;
 514
 515    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 516       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 517          swrast->TextureSample[i] = NULL;
 518 }
 519
 520
 521 void
 522 _swrast_update_texture_samplers(GLcontext *ctx)
 523 {
 524    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 525    GLuint u;
 526
 527    if (!swrast)
 528       return; /* pipe hack */
 529
 530    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 531       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 532       /* Note: If tObj is NULL, the sample function will be a simple
 533        * function that just returns opaque black (0,0,0,1).
 534        */
 535       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 536    }
 537 }
 538
 539
 540 /**
 541  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 542  * swrast->_ActiveAtttribMask.
 543  */
 544 static void
 545 _swrast_update_active_attribs(GLcontext *ctx)
 546 {
 547    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 548    GLuint attribsMask;
 549
 550    /*
 551     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 552     */
 553    if (ctx->FragmentProgram._Current) {
 554       /* fragment program/shader */
 555       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 556       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 557    }
 558    else if (ctx->ATIFragmentShader._Enabled) {
 559       attribsMask = ~0;  /* XXX fix me */
 560    }
 561    else {
 562       /* fixed function */
 563       attribsMask = 0x0;
 564
 565 #if CHAN_TYPE == GL_FLOAT
 566       attribsMask |= FRAG_BIT_COL0;
 567 #endif
 568
 569       if (ctx->Fog.ColorSumEnabled ||
 570           (ctx->Light.Enabled &&
 571            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 572          attribsMask |= FRAG_BIT_COL1;
 573       }
 574
 575       if (swrast->_FogEnabled)
 576          attribsMask |= FRAG_BIT_FOGC;
 577
 578       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 579    }
 580
 581    swrast->_ActiveAttribMask = attribsMask;
 582
 583    /* Update _ActiveAttribs[] list */
 584    {
 585       GLuint i, num = 0;
 586       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 587          if (attribsMask & (1 << i)) {
 588             swrast->_ActiveAttribs[num++] = i;
 589             /* how should this attribute be interpolated? */
 590             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 591                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 592             else
 593                swrast->_InterpMode[i] = GL_SMOOTH;
 594          }
 595       }
 596       swrast->_NumActiveAttribs = num;
 597    }
 598 }
 599
 600
 601 /**
 602  * Update the swrast->_ColorOutputsMask which indicates which color
 603  * renderbuffers (aka rendertargets) are being written to by the current
 604  * fragment program.
 605  * We also take glDrawBuffers() into account to skip outputs that are
 606  * set to GL_NONE.
 607  */
 608 static void
 609 _swrast_update_color_outputs(GLcontext *ctx)
 610 {
 611    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 612    const struct gl_framebuffer *fb = ctx->DrawBuffer;
 613
 614    swrast->_ColorOutputsMask = 0;
 615    swrast->_NumColorOutputs = 0;
 616
 617    if (ctx->FragmentProgram._Current) {
 618       const GLbitfield outputsWritten
 619          = ctx->FragmentProgram._Current->Base.OutputsWritten;
 620       GLuint output;
 621       for (output = 0; output < ctx->Const.MaxDrawBuffers; output++) {
 622          if ((outputsWritten & (1 << (FRAG_RESULT_DATA0 + output)))
 623              && (fb->_NumColorDrawBuffers[output] > 0)) {
 624             swrast->_ColorOutputsMask |= (1 << output);
 625             swrast->_NumColorOutputs = output + 1;
 626          }
 627       }
 628    }
 629    if (swrast->_ColorOutputsMask == 0x0) {
 630       /* no fragment program, or frag prog didn't write to gl_FragData[] */
 631       if (fb->_NumColorDrawBuffers[0] > 0) {
 632          swrast->_ColorOutputsMask = 0x1;
 633          swrast->_NumColorOutputs = 1;
 634       }
 635    }
 636 }
 637
 638
 639 void
 640 _swrast_validate_derived( GLcontext *ctx )
 641 {
 642    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 643
 644    if (swrast->NewState) {
 645       if (swrast->NewState & _NEW_POLYGON)
 646          _swrast_update_polygon( ctx );
 647
 648       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 649          _swrast_update_fog_hint( ctx );
 650
 651       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 652          _swrast_update_texture_env( ctx );
 653
 654       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 655          _swrast_update_fog_state( ctx );
 656
 657       if (swrast->NewState & (_NEW_MODELVIEW |
 658                               _NEW_PROJECTION |
 659                               _NEW_TEXTURE_MATRIX |
 660                               _NEW_FOG |
 661                               _NEW_LIGHT |
 662                               _NEW_LINE |
 663                               _NEW_TEXTURE |
 664                               _NEW_TRANSFORM |
 665                               _NEW_POINT |
 666                               _NEW_VIEWPORT |
 667                               _NEW_PROGRAM))
 668          _swrast_update_fragment_program( ctx, swrast->NewState );
 669
 670       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 671          _swrast_update_texture_samplers( ctx );
 672          _swrast_validate_texture_images(ctx);
 673       }
 674
 675       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 676          _swrast_update_deferred_texture(ctx);
 677
 678       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 679          _swrast_update_rasterflags( ctx );
 680
 681       if (swrast->NewState & (_NEW_DEPTH |
 682                               _NEW_FOG |
 683                               _NEW_LIGHT |
 684                               _NEW_PROGRAM |
 685                               _NEW_TEXTURE))
 686          _swrast_update_active_attribs(ctx);
 687
 688       if (swrast->NewState & (_NEW_PROGRAM | _NEW_BUFFERS))
 689          _swrast_update_color_outputs(ctx);
 690
 691       swrast->NewState = 0;
 692       swrast->StateChanges = 0;
 693       swrast->InvalidateState = _swrast_invalidate_state;
 694    }
 695 }
 696
 697 #define SWRAST_DEBUG 0
 698
 699 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 700  */
 701 void
 702 _swrast_Quad( GLcontext *ctx,
 703               const SWvertex *v0, const SWvertex *v1,
 704               const SWvertex *v2, const SWvertex *v3 )
 705 {
 706    if (SWRAST_DEBUG) {
 707       _mesa_debug(ctx, "_swrast_Quad\n");
 708       _swrast_print_vertex( ctx, v0 );
 709       _swrast_print_vertex( ctx, v1 );
 710       _swrast_print_vertex( ctx, v2 );
 711       _swrast_print_vertex( ctx, v3 );
 712    }
 713    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 714    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 715 }
 716
 717 void
 718 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 719                   const SWvertex *v1, const SWvertex *v2 )
 720 {
 721    if (SWRAST_DEBUG) {
 722       _mesa_debug(ctx, "_swrast_Triangle\n");
 723       _swrast_print_vertex( ctx, v0 );
 724       _swrast_print_vertex( ctx, v1 );
 725       _swrast_print_vertex( ctx, v2 );
 726    }
 727    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 728 }
 729
 730 void
 731 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 732 {
 733    if (SWRAST_DEBUG) {
 734       _mesa_debug(ctx, "_swrast_Line\n");
 735       _swrast_print_vertex( ctx, v0 );
 736       _swrast_print_vertex( ctx, v1 );
 737    }
 738    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 739 }
 740
 741 void
 742 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 743 {
 744    if (SWRAST_DEBUG) {
 745       _mesa_debug(ctx, "_swrast_Point\n");
 746       _swrast_print_vertex( ctx, v0 );
 747    }
 748    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 749 }
 750
 751 void
 752 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 753 {
 754    if (SWRAST_DEBUG) {
 755       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 756    }
 757    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 758 }
 759
 760 void
 761 _swrast_ResetLineStipple( GLcontext *ctx )
 762 {
 763    if (SWRAST_DEBUG) {
 764       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 765    }
 766    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 767 }
 768
 769 void
 770 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 771 {
 772    if (SWRAST_DEBUG) {
 773       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 774    }
 775    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 776    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 777 }
 778
 779 void
 780 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 781 {
 782    if (SWRAST_DEBUG) {
 783       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 784    }
 785    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 786    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 787 }
 788
 789
 790 GLboolean
 791 _swrast_CreateContext( GLcontext *ctx )
 792 {
 793    GLuint i;
 794    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 795
 796    if (SWRAST_DEBUG) {
 797       _mesa_debug(ctx, "_swrast_CreateContext\n");
 798    }
 799
 800    if (!swrast)
 801       return GL_FALSE;
 802
 803    swrast->NewState = ~0;
 804
 805    swrast->choose_point = _swrast_choose_point;
 806    swrast->choose_line = _swrast_choose_line;
 807    swrast->choose_triangle = _swrast_choose_triangle;
 808
 809    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 810    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 811    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 812
 813    swrast->Point = _swrast_validate_point;
 814    swrast->Line = _swrast_validate_line;
 815    swrast->Triangle = _swrast_validate_triangle;
 816    swrast->InvalidateState = _swrast_sleep;
 817    swrast->BlendFunc = _swrast_validate_blend_func;
 818
 819    swrast->AllowVertexFog = GL_TRUE;
 820    swrast->AllowPixelFog = GL_TRUE;
 821
 822    /* Optimized Accum buffer */
 823    swrast->_IntegerAccumMode = GL_FALSE;
 824    swrast->_IntegerAccumScaler = 0.0;
 825
 826    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 827       swrast->TextureSample[i] = NULL;
 828
 829    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 830    if (!swrast->SpanArrays) {
 831       FREE(swrast);
 832       return GL_FALSE;
 833    }
 834    swrast->SpanArrays->ChanType = CHAN_TYPE;
 835 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 836    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;
 837 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 838    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;
 839 #else
 840    swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 841 #endif
 842
 843    /* init point span buffer */
 844    swrast->PointSpan.primitive = GL_POINT;
 845    swrast->PointSpan.end = 0;
 846    swrast->PointSpan.facing = 0;
 847    swrast->PointSpan.array = swrast->SpanArrays;
 848
 849    swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureImageUnits *
 850                                            MAX_WIDTH * 4 * sizeof(GLchan));
 851    if (!swrast->TexelBuffer) {
 852       FREE(swrast->SpanArrays);
 853       FREE(swrast);
 854       return GL_FALSE;
 855    }
 856
 857    ctx->swrast_context = swrast;
 858
 859    return GL_TRUE;
 860 }
 861
 862 void
 863 _swrast_DestroyContext( GLcontext *ctx )
 864 {
 865    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 866
 867    if (SWRAST_DEBUG) {
 868       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 869    }
 870
 871    FREE( swrast->SpanArrays );
 872    FREE( swrast->TexelBuffer );
 873    FREE( swrast );
 874
 875    ctx->swrast_context = 0;
 876 }
 877
 878
 879 struct swrast_device_driver *
 880 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 881 {
 882    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 883    return &swrast->Driver;
 884 }
 885
 886 void
 887 _swrast_flush( GLcontext *ctx )
 888 {
 889    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 890    /* flush any pending fragments from rendering points */
 891    if (swrast->PointSpan.end > 0) {
 892       if (ctx->Visual.rgbMode) {
 893          _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 894       }
 895       else {
 896          _swrast_write_index_span(ctx, &(swrast->PointSpan));
 897       }
 898       swrast->PointSpan.end = 0;
 899    }
 900 }
 901
 902 void
 903 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 904 {
 905    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 906    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 907       _swrast_flush(ctx);
 908    }
 909    swrast->Primitive = prim;
 910 }
 911
 912
 913 void
 914 _swrast_render_start( GLcontext *ctx )
 915 {
 916    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 917    if (swrast->Driver.SpanRenderStart)
 918       swrast->Driver.SpanRenderStart( ctx );
 919    swrast->PointSpan.end = 0;
 920 }
 921
 922 void
 923 _swrast_render_finish( GLcontext *ctx )
 924 {
 925    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 926    if (swrast->Driver.SpanRenderFinish)
 927       swrast->Driver.SpanRenderFinish( ctx );
 928
 929    _swrast_flush(ctx);
 930 }
 931
 932
 933 #define SWRAST_DEBUG_VERTICES 0
 934
 935 void
 936 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 937 {
 938    GLuint i;
 939
 940    if (SWRAST_DEBUG_VERTICES) {
 941       _mesa_debug(ctx, "win %f %f %f %f\n",
 942                   v->attrib[FRAG_ATTRIB_WPOS][0],
 943                   v->attrib[FRAG_ATTRIB_WPOS][1],
 944                   v->attrib[FRAG_ATTRIB_WPOS][2],
 945                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 946
 947       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 948          if (ctx->Texture.Unit[i]._ReallyEnabled)
 949             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 950                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 951                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 952                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 953                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 954
 955 #if CHAN_TYPE == GL_FLOAT
 956       _mesa_debug(ctx, "color %f %f %f %f\n",
 957                   v->color[0], v->color[1], v->color[2], v->color[3]);
 958 #else
 959       _mesa_debug(ctx, "color %d %d %d %d\n",
 960                   v->color[0], v->color[1], v->color[2], v->color[3]);
 961 #endif
 962       _mesa_debug(ctx, "spec %g %g %g %g\n",
 963                   v->attrib[FRAG_ATTRIB_COL1][0],
 964                   v->attrib[FRAG_ATTRIB_COL1][1],
 965                   v->attrib[FRAG_ATTRIB_COL1][2],
 966                   v->attrib[FRAG_ATTRIB_COL1][3]);
 967       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 968       _mesa_debug(ctx, "index %d\n", v->attrib[FRAG_ATTRIB_CI][0]);
 969       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 970       _mesa_debug(ctx, "\n");
 971    }
 972 }