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 #if 0
 268       /* XXX Need a way to trigger the initial loading of parameters
 269        * even when there's no recent state changes.
 270        */
 271       if (fp->Base.Parameters->StateFlags & newState)
 272 #endif
 273          _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 274    }
 275 }
 276
 277
 278 /**
 279  * See if we can do early diffuse+specular (primary+secondary) color
 280  * add per vertex instead of per-fragment.
 281  */
 282 static void
 283 _swrast_update_specular_vertex_add(GLcontext *ctx)
 284 {
 285    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 286    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 287       (ctx->Light.Enabled &&
 288        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 289
 290    swrast->SpecularVertexAdd = (separateSpecular
 291                                 && ctx->Texture._EnabledUnits == 0x0
 292                                 && !ctx->FragmentProgram._Current
 293                                 && !ctx->ATIFragmentShader._Enabled);
 294 }
 295
 296
 297 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 298                              _NEW_TEXTURE |             \
 299                              _NEW_HINT |                \
 300                              _NEW_POLYGON )
 301
 302 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 303  */
 304 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 305                               _NEW_RENDERMODE|                  \
 306                               _NEW_POLYGON|                     \
 307                               _NEW_DEPTH|                       \
 308                               _NEW_STENCIL|                     \
 309                               _NEW_COLOR|                       \
 310                               _NEW_TEXTURE|                     \
 311                               _SWRAST_NEW_RASTERMASK|           \
 312                               _NEW_LIGHT|                       \
 313                               _NEW_FOG |                        \
 314                               _DD_NEW_SEPARATE_SPECULAR)
 315
 316 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 317                           _NEW_RENDERMODE|              \
 318                           _NEW_LINE|                    \
 319                           _NEW_TEXTURE|                 \
 320                           _NEW_LIGHT|                   \
 321                           _NEW_FOG|                     \
 322                           _NEW_DEPTH |                  \
 323                           _DD_NEW_SEPARATE_SPECULAR)
 324
 325 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 326                            _NEW_RENDERMODE |            \
 327                            _NEW_POINT |                 \
 328                            _NEW_TEXTURE |               \
 329                            _NEW_LIGHT |                 \
 330                            _NEW_FOG |                   \
 331                            _DD_NEW_SEPARATE_SPECULAR)
 332
 333 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 334
 335 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 336
 337 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 338
 339
 340
 341 /**
 342  * Stub for swrast->Triangle to select a true triangle function
 343  * after a state change.
 344  */
 345 static void
 346 _swrast_validate_triangle( GLcontext *ctx,
 347                            const SWvertex *v0,
 348                            const SWvertex *v1,
 349                            const SWvertex *v2 )
 350 {
 351    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 352
 353    _swrast_validate_derived( ctx );
 354    swrast->choose_triangle( ctx );
 355    ASSERT(swrast->Triangle);
 356
 357    if (swrast->SpecularVertexAdd) {
 358       /* separate specular color, but no texture */
 359       swrast->SpecTriangle = swrast->Triangle;
 360       swrast->Triangle = _swrast_add_spec_terms_triangle;
 361    }
 362
 363    swrast->Triangle( ctx, v0, v1, v2 );
 364 }
 365
 366 /**
 367  * Called via swrast->Line.  Examine current GL state and choose a software
 368  * line routine.  Then call it.
 369  */
 370 static void
 371 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 372 {
 373    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 374
 375    _swrast_validate_derived( ctx );
 376    swrast->choose_line( ctx );
 377    ASSERT(swrast->Line);
 378
 379    if (swrast->SpecularVertexAdd) {
 380       swrast->SpecLine = swrast->Line;
 381       swrast->Line = _swrast_add_spec_terms_line;
 382    }
 383
 384    swrast->Line( ctx, v0, v1 );
 385 }
 386
 387 /**
 388  * Called via swrast->Point.  Examine current GL state and choose a software
 389  * point routine.  Then call it.
 390  */
 391 static void
 392 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 393 {
 394    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 395
 396    _swrast_validate_derived( ctx );
 397    swrast->choose_point( ctx );
 398
 399    if (swrast->SpecularVertexAdd) {
 400       swrast->SpecPoint = swrast->Point;
 401       swrast->Point = _swrast_add_spec_terms_point;
 402    }
 403
 404    swrast->Point( ctx, v0 );
 405 }
 406
 407
 408 /**
 409  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 410  * function, then call it.
 411  */
 412 static void _ASMAPI
 413 _swrast_validate_blend_func(GLcontext *ctx, GLuint n, const GLubyte mask[],
 414                             GLvoid *src, const GLvoid *dst,
 415                             GLenum chanType )
 416 {
 417    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 418
 419    _swrast_validate_derived( ctx ); /* why is this needed? */
 420    _swrast_choose_blend_func( ctx, chanType );
 421
 422    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 423 }
 424
 425
 426 /**
 427  * Make sure we have texture image data for all the textures we may need
 428  * for subsequent rendering.
 429  */
 430 static void
 431 _swrast_validate_texture_images(GLcontext *ctx)
 432 {
 433    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 434    GLuint u;
 435
 436    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 437       /* no textures enabled, or no way to validate images! */
 438       return;
 439    }
 440
 441    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 442       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 443          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 444          ASSERT(texObj);
 445          if (texObj) {
 446             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 447             GLuint face;
 448             for (face = 0; face < numFaces; face++) {
 449                GLint lvl;
 450                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 451                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 452                   if (texImg && !texImg->Data) {
 453                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 454                      ASSERT(texObj->Image[face][lvl]->Data);
 455                   }
 456                }
 457             }
 458          }
 459       }
 460    }
 461 }
 462
 463
 464 /**
 465  * Free the texture image data attached to all currently enabled
 466  * textures.  Meant to be called by device drivers when transitioning
 467  * from software to hardware rendering.
 468  */
 469 void
 470 _swrast_eject_texture_images(GLcontext *ctx)
 471 {
 472    GLuint u;
 473
 474    if (!ctx->Texture._EnabledUnits) {
 475       /* no textures enabled */
 476       return;
 477    }
 478
 479    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 480       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 481          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 482          ASSERT(texObj);
 483          if (texObj) {
 484             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 485             GLuint face;
 486             for (face = 0; face < numFaces; face++) {
 487                GLint lvl;
 488                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 489                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 490                   if (texImg && texImg->Data) {
 491                      _mesa_free_texmemory(texImg->Data);
 492                      texImg->Data = NULL;
 493                   }
 494                }
 495             }
 496          }
 497       }
 498    }
 499 }
 500
 501
 502
 503 static void
 504 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 505 {
 506    (void) ctx; (void) new_state;
 507 }
 508
 509
 510 static void
 511 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 512 {
 513    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 514    GLuint i;
 515
 516    swrast->NewState |= new_state;
 517
 518    /* After 10 statechanges without any swrast functions being called,
 519     * put the module to sleep.
 520     */
 521    if (++swrast->StateChanges > 10) {
 522       swrast->InvalidateState = _swrast_sleep;
 523       swrast->NewState = ~0;
 524       new_state = ~0;
 525    }
 526
 527    {
 528       const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 529       if (fp && (fp->Base.Parameters->StateFlags & new_state)) {
 530          _mesa_load_state_parameters(ctx, fp->Base.Parameters);
 531       }
 532    }
 533
 534    if (new_state & swrast->InvalidateTriangleMask)
 535       swrast->Triangle = _swrast_validate_triangle;
 536
 537    if (new_state & swrast->InvalidateLineMask)
 538       swrast->Line = _swrast_validate_line;
 539
 540    if (new_state & swrast->InvalidatePointMask)
 541       swrast->Point = _swrast_validate_point;
 542
 543    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 544       swrast->BlendFunc = _swrast_validate_blend_func;
 545
 546    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 547       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 548          swrast->TextureSample[i] = NULL;
 549 }
 550
 551
 552 void
 553 _swrast_update_texture_samplers(GLcontext *ctx)
 554 {
 555    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 556    GLuint u;
 557
 558    if (!swrast)
 559       return; /* pipe hack */
 560
 561    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 562       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 563       /* Note: If tObj is NULL, the sample function will be a simple
 564        * function that just returns opaque black (0,0,0,1).
 565        */
 566       swrast->TextureSample[u] = _swrast_choose_texture_sample_func(ctx, tObj);
 567    }
 568 }
 569
 570
 571 /**
 572  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 573  * swrast->_ActiveAtttribMask.
 574  */
 575 static void
 576 _swrast_update_active_attribs(GLcontext *ctx)
 577 {
 578    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 579    GLuint attribsMask;
 580
 581    /*
 582     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 583     */
 584    if (ctx->FragmentProgram._Current) {
 585       /* fragment program/shader */
 586       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 587       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 588    }
 589    else if (ctx->ATIFragmentShader._Enabled) {
 590       attribsMask = ~0;  /* XXX fix me */
 591    }
 592    else {
 593       /* fixed function */
 594       attribsMask = 0x0;
 595
 596 #if CHAN_TYPE == GL_FLOAT
 597       attribsMask |= FRAG_BIT_COL0;
 598 #endif
 599
 600       if (ctx->Fog.ColorSumEnabled ||
 601           (ctx->Light.Enabled &&
 602            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 603          attribsMask |= FRAG_BIT_COL1;
 604       }
 605
 606       if (swrast->_FogEnabled)
 607          attribsMask |= FRAG_BIT_FOGC;
 608
 609       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 610    }
 611
 612    swrast->_ActiveAttribMask = attribsMask;
 613
 614    /* Update _ActiveAttribs[] list */
 615    {
 616       GLuint i, num = 0;
 617       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 618          if (attribsMask & (1 << i)) {
 619             swrast->_ActiveAttribs[num++] = i;
 620             /* how should this attribute be interpolated? */
 621             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 622                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 623             else
 624                swrast->_InterpMode[i] = GL_SMOOTH;
 625          }
 626       }
 627       swrast->_NumActiveAttribs = num;
 628    }
 629 }
 630
 631
 632 void
 633 _swrast_validate_derived( GLcontext *ctx )
 634 {
 635    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 636
 637    if (swrast->NewState) {
 638       if (swrast->NewState & _NEW_POLYGON)
 639          _swrast_update_polygon( ctx );
 640
 641       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 642          _swrast_update_fog_hint( ctx );
 643
 644       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 645          _swrast_update_texture_env( ctx );
 646
 647       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 648          _swrast_update_fog_state( ctx );
 649
 650       if (swrast->NewState & (_NEW_MODELVIEW |
 651                               _NEW_PROJECTION |
 652                               _NEW_TEXTURE_MATRIX |
 653                               _NEW_FOG |
 654                               _NEW_LIGHT |
 655                               _NEW_LINE |
 656                               _NEW_TEXTURE |
 657                               _NEW_TRANSFORM |
 658                               _NEW_POINT |
 659                               _NEW_VIEWPORT |
 660                               _NEW_PROGRAM))
 661          _swrast_update_fragment_program( ctx, swrast->NewState );
 662
 663       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 664          _swrast_update_texture_samplers( ctx );
 665          _swrast_validate_texture_images(ctx);
 666       }
 667
 668       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 669          _swrast_update_deferred_texture(ctx);
 670
 671       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 672          _swrast_update_rasterflags( ctx );
 673
 674       if (swrast->NewState & (_NEW_DEPTH |
 675                               _NEW_FOG |
 676                               _NEW_LIGHT |
 677                               _NEW_PROGRAM |
 678                               _NEW_TEXTURE))
 679          _swrast_update_active_attribs(ctx);
 680
 681       if (swrast->NewState & (_NEW_FOG |
 682                               _NEW_PROGRAM |
 683                               _NEW_LIGHT |
 684                               _NEW_TEXTURE))
 685          _swrast_update_specular_vertex_add(ctx);
 686
 687       swrast->NewState = 0;
 688       swrast->StateChanges = 0;
 689       swrast->InvalidateState = _swrast_invalidate_state;
 690    }
 691 }
 692
 693 #define SWRAST_DEBUG 0
 694
 695 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 696  */
 697 void
 698 _swrast_Quad( GLcontext *ctx,
 699               const SWvertex *v0, const SWvertex *v1,
 700               const SWvertex *v2, const SWvertex *v3 )
 701 {
 702    if (SWRAST_DEBUG) {
 703       _mesa_debug(ctx, "_swrast_Quad\n");
 704       _swrast_print_vertex( ctx, v0 );
 705       _swrast_print_vertex( ctx, v1 );
 706       _swrast_print_vertex( ctx, v2 );
 707       _swrast_print_vertex( ctx, v3 );
 708    }
 709    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 710    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 711 }
 712
 713 void
 714 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 715                   const SWvertex *v1, const SWvertex *v2 )
 716 {
 717    if (SWRAST_DEBUG) {
 718       _mesa_debug(ctx, "_swrast_Triangle\n");
 719       _swrast_print_vertex( ctx, v0 );
 720       _swrast_print_vertex( ctx, v1 );
 721       _swrast_print_vertex( ctx, v2 );
 722    }
 723    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 724 }
 725
 726 void
 727 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 728 {
 729    if (SWRAST_DEBUG) {
 730       _mesa_debug(ctx, "_swrast_Line\n");
 731       _swrast_print_vertex( ctx, v0 );
 732       _swrast_print_vertex( ctx, v1 );
 733    }
 734    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 735 }
 736
 737 void
 738 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 739 {
 740    if (SWRAST_DEBUG) {
 741       _mesa_debug(ctx, "_swrast_Point\n");
 742       _swrast_print_vertex( ctx, v0 );
 743    }
 744    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 745 }
 746
 747 void
 748 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 749 {
 750    if (SWRAST_DEBUG) {
 751       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 752    }
 753    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 754 }
 755
 756 void
 757 _swrast_ResetLineStipple( GLcontext *ctx )
 758 {
 759    if (SWRAST_DEBUG) {
 760       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 761    }
 762    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 763 }
 764
 765 void
 766 _swrast_SetFacing(GLcontext *ctx, GLuint facing)
 767 {
 768    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 769 }
 770
 771 void
 772 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 773 {
 774    if (SWRAST_DEBUG) {
 775       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 776    }
 777    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 778    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 779 }
 780
 781 void
 782 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 783 {
 784    if (SWRAST_DEBUG) {
 785       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 786    }
 787    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 788    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 789 }
 790
 791
 792 GLboolean
 793 _swrast_CreateContext( GLcontext *ctx )
 794 {
 795    GLuint i;
 796    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 797
 798    if (SWRAST_DEBUG) {
 799       _mesa_debug(ctx, "_swrast_CreateContext\n");
 800    }
 801
 802    if (!swrast)
 803       return GL_FALSE;
 804
 805    swrast->NewState = ~0;
 806
 807    swrast->choose_point = _swrast_choose_point;
 808    swrast->choose_line = _swrast_choose_line;
 809    swrast->choose_triangle = _swrast_choose_triangle;
 810
 811    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 812    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 813    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 814
 815    swrast->Point = _swrast_validate_point;
 816    swrast->Line = _swrast_validate_line;
 817    swrast->Triangle = _swrast_validate_triangle;
 818    swrast->InvalidateState = _swrast_sleep;
 819    swrast->BlendFunc = _swrast_validate_blend_func;
 820
 821    swrast->AllowVertexFog = GL_TRUE;
 822    swrast->AllowPixelFog = GL_TRUE;
 823
 824    /* Optimized Accum buffer */
 825    swrast->_IntegerAccumMode = GL_FALSE;
 826    swrast->_IntegerAccumScaler = 0.0;
 827
 828    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 829       swrast->TextureSample[i] = NULL;
 830
 831    swrast->SpanArrays = MALLOC_STRUCT(sw_span_arrays);
 832    if (!swrast->SpanArrays) {
 833       FREE(swrast);
 834       return GL_FALSE;
 835    }
 836    swrast->SpanArrays->ChanType = CHAN_TYPE;
 837 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 838    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba8;
 839 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 840    swrast->SpanArrays->rgba = swrast->SpanArrays->rgba16;
 841 #else
 842    swrast->SpanArrays->rgba = swrast->SpanArrays->attribs[FRAG_ATTRIB_COL0];
 843 #endif
 844
 845    /* init point span buffer */
 846    swrast->PointSpan.primitive = GL_POINT;
 847    swrast->PointSpan.end = 0;
 848    swrast->PointSpan.facing = 0;
 849    swrast->PointSpan.array = swrast->SpanArrays;
 850
 851    swrast->TexelBuffer = (GLfloat *) MALLOC(ctx->Const.MaxTextureImageUnits *
 852                                            MAX_WIDTH * 4 * sizeof(GLfloat));
 853    if (!swrast->TexelBuffer) {
 854       FREE(swrast->SpanArrays);
 855       FREE(swrast);
 856       return GL_FALSE;
 857    }
 858
 859    ctx->swrast_context = swrast;
 860
 861    return GL_TRUE;
 862 }
 863
 864 void
 865 _swrast_DestroyContext( GLcontext *ctx )
 866 {
 867    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 868
 869    if (SWRAST_DEBUG) {
 870       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 871    }
 872
 873    FREE( swrast->SpanArrays );
 874    if (swrast->ZoomedArrays)
 875       FREE( swrast->ZoomedArrays );
 876    FREE( swrast->TexelBuffer );
 877    FREE( swrast );
 878
 879    ctx->swrast_context = 0;
 880 }
 881
 882
 883 struct swrast_device_driver *
 884 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 885 {
 886    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 887    return &swrast->Driver;
 888 }
 889
 890 void
 891 _swrast_flush( GLcontext *ctx )
 892 {
 893    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 894    /* flush any pending fragments from rendering points */
 895    if (swrast->PointSpan.end > 0) {
 896       if (ctx->Visual.rgbMode) {
 897          _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 898       }
 899       else {
 900          _swrast_write_index_span(ctx, &(swrast->PointSpan));
 901       }
 902       swrast->PointSpan.end = 0;
 903    }
 904 }
 905
 906 void
 907 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 908 {
 909    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 910    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 911       _swrast_flush(ctx);
 912    }
 913    swrast->Primitive = prim;
 914 }
 915
 916
 917 void
 918 _swrast_render_start( GLcontext *ctx )
 919 {
 920    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 921    if (swrast->Driver.SpanRenderStart)
 922       swrast->Driver.SpanRenderStart( ctx );
 923    swrast->PointSpan.end = 0;
 924 }
 925
 926 void
 927 _swrast_render_finish( GLcontext *ctx )
 928 {
 929    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 930    if (swrast->Driver.SpanRenderFinish)
 931       swrast->Driver.SpanRenderFinish( ctx );
 932
 933    _swrast_flush(ctx);
 934 }
 935
 936
 937 #define SWRAST_DEBUG_VERTICES 0
 938
 939 void
 940 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 941 {
 942    GLuint i;
 943
 944    if (SWRAST_DEBUG_VERTICES) {
 945       _mesa_debug(ctx, "win %f %f %f %f\n",
 946                   v->attrib[FRAG_ATTRIB_WPOS][0],
 947                   v->attrib[FRAG_ATTRIB_WPOS][1],
 948                   v->attrib[FRAG_ATTRIB_WPOS][2],
 949                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 950
 951       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 952          if (ctx->Texture.Unit[i]._ReallyEnabled)
 953             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 954                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 955                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 956                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 957                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 958
 959 #if CHAN_TYPE == GL_FLOAT
 960       _mesa_debug(ctx, "color %f %f %f %f\n",
 961                   v->color[0], v->color[1], v->color[2], v->color[3]);
 962 #else
 963       _mesa_debug(ctx, "color %d %d %d %d\n",
 964                   v->color[0], v->color[1], v->color[2], v->color[3]);
 965 #endif
 966       _mesa_debug(ctx, "spec %g %g %g %g\n",
 967                   v->attrib[FRAG_ATTRIB_COL1][0],
 968                   v->attrib[FRAG_ATTRIB_COL1][1],
 969                   v->attrib[FRAG_ATTRIB_COL1][2],
 970                   v->attrib[FRAG_ATTRIB_COL1][3]);
 971       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 972       _mesa_debug(ctx, "index %d\n", v->attrib[FRAG_ATTRIB_CI][0]);
 973       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 974       _mesa_debug(ctx, "\n");
 975    }
 976 }