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  * THE AUTHORS 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/colormac.h"
  32 #include "main/mtypes.h"
  33 #include "main/samplerobj.h"
  34 #include "main/teximage.h"
  35 #include "program/prog_parameter.h"
  36 #include "program/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_texfetch.h"
  44 #include "s_triangle.h"
  45 #include "s_texfilter.h"
  46
  47
  48 /**
  49  * Recompute the value of swrast->_RasterMask, etc. according to
  50  * the current context.  The _RasterMask field can be easily tested by
  51  * drivers to determine certain basic GL state (does the primitive need
  52  * stenciling, logic-op, fog, etc?).
  53  */
  54 static void
  55 _swrast_update_rasterflags( struct gl_context *ctx )
  56 {
  57    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  58    GLbitfield rasterMask = 0;
  59    GLuint i;
  60
  61    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  62    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  63    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  64    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  65    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  66    if (ctx->Stencil._Enabled)             rasterMask |= STENCIL_BIT;
  67    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  68       if (!ctx->Color.ColorMask[i][0] ||
  69           !ctx->Color.ColorMask[i][1] ||
  70           !ctx->Color.ColorMask[i][2] ||
  71           !ctx->Color.ColorMask[i][3]) {
  72          rasterMask |= MASKING_BIT;
  73          break;
  74       }
  75    }
  76    if (ctx->Color.ColorLogicOpEnabled) rasterMask |= LOGIC_OP_BIT;
  77    if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  78    if (   ctx->Viewport.X < 0
  79        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  80        || ctx->Viewport.Y < 0
  81        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  82       rasterMask |= CLIP_BIT;
  83    }
  84
  85    if (ctx->Query.CurrentOcclusionObject)
  86       rasterMask |= OCCLUSION_BIT;
  87
  88
  89    /* If we're not drawing to exactly one color buffer set the
  90     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  91     * buffers or the RGBA or CI mask disables all writes.
  92     */
  93    if (ctx->DrawBuffer->_NumColorDrawBuffers != 1) {
  94       /* more than one color buffer designated for writing (or zero buffers) */
  95       rasterMask |= MULTI_DRAW_BIT;
  96    }
  97
  98    for (i = 0; i < ctx->Const.MaxDrawBuffers; i++) {
  99       if (ctx->Color.ColorMask[i][0] +
 100           ctx->Color.ColorMask[i][1] +
 101           ctx->Color.ColorMask[i][2] +
 102           ctx->Color.ColorMask[i][3] == 0) {
 103          rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 104          break;
 105       }
 106    }
 107
 108
 109    if (_swrast_use_fragment_program(ctx)) {
 110       rasterMask |= FRAGPROG_BIT;
 111    }
 112
 113    if (ctx->ATIFragmentShader._Enabled) {
 114       rasterMask |= ATIFRAGSHADER_BIT;
 115    }
 116
 117 #if CHAN_TYPE == GL_FLOAT
 118    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 119       rasterMask |= CLAMPING_BIT;
 120    }
 121 #endif
 122
 123    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 124 }
 125
 126
 127 /**
 128  * Examine polygon cull state to compute the _BackfaceCullSign field.
 129  * _BackfaceCullSign will be 0 if no culling, -1 if culling back-faces,
 130  * and 1 if culling front-faces.  The Polygon FrontFace state also
 131  * factors in.
 132  */
 133 static void
 134 _swrast_update_polygon( struct gl_context *ctx )
 135 {
 136    GLfloat backface_sign;
 137
 138    if (ctx->Polygon.CullFlag) {
 139       switch (ctx->Polygon.CullFaceMode) {
 140       case GL_BACK:
 141          backface_sign = -1.0F;
 142          break;
 143       case GL_FRONT:
 144          backface_sign = 1.0F;
 145          break;
 146       case GL_FRONT_AND_BACK:
 147          /* fallthrough */
 148       default:
 149          backface_sign = 0.0F;
 150       }
 151    }
 152    else {
 153       backface_sign = 0.0F;
 154    }
 155
 156    SWRAST_CONTEXT(ctx)->_BackfaceCullSign = backface_sign;
 157
 158    /* This is for front/back-face determination, but not for culling */
 159    SWRAST_CONTEXT(ctx)->_BackfaceSign
 160       = (ctx->Polygon.FrontFace == GL_CW) ? -1.0F : 1.0F;
 161 }
 162
 163
 164
 165 /**
 166  * Update the _PreferPixelFog field to indicate if we need to compute
 167  * fog blend factors (from the fog coords) per-fragment.
 168  */
 169 static void
 170 _swrast_update_fog_hint( struct gl_context *ctx )
 171 {
 172    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 173    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 174                               _swrast_use_fragment_program(ctx) ||
 175                               (ctx->Hint.Fog == GL_NICEST &&
 176                                swrast->AllowPixelFog));
 177 }
 178
 179
 180
 181 /**
 182  * Update the swrast->_TextureCombinePrimary flag.
 183  */
 184 static void
 185 _swrast_update_texture_env( struct gl_context *ctx )
 186 {
 187    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 188    GLuint i;
 189
 190    swrast->_TextureCombinePrimary = GL_FALSE;
 191
 192    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 193       const struct gl_tex_env_combine_state *combine =
 194          ctx->Texture.Unit[i]._CurrentCombine;
 195       GLuint term;
 196       for (term = 0; term < combine->_NumArgsRGB; term++) {
 197          if (combine->SourceRGB[term] == GL_PRIMARY_COLOR) {
 198             swrast->_TextureCombinePrimary = GL_TRUE;
 199             return;
 200          }
 201          if (combine->SourceA[term] == GL_PRIMARY_COLOR) {
 202             swrast->_TextureCombinePrimary = GL_TRUE;
 203             return;
 204          }
 205       }
 206    }
 207 }
 208
 209
 210 /**
 211  * Determine if we can defer texturing/shading until after Z/stencil
 212  * testing.  This potentially allows us to skip texturing/shading for
 213  * lots of fragments.
 214  */
 215 static void
 216 _swrast_update_deferred_texture(struct gl_context *ctx)
 217 {
 218    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 219    if (ctx->Color.AlphaEnabled) {
 220       /* alpha test depends on post-texture/shader colors */
 221       swrast->_DeferredTexture = GL_FALSE;
 222    }
 223    else {
 224       GLboolean use_fprog = _swrast_use_fragment_program(ctx);
 225       const struct gl_fragment_program *fprog
 226          = ctx->FragmentProgram._Current;
 227       if (use_fprog && (fprog->Base.OutputsWritten & (1 << FRAG_RESULT_DEPTH))) {
 228          /* Z comes from fragment program/shader */
 229          swrast->_DeferredTexture = GL_FALSE;
 230       }
 231       else if (use_fprog && fprog->UsesKill) {
 232          swrast->_DeferredTexture = GL_FALSE;
 233       }
 234       else if (ctx->Query.CurrentOcclusionObject) {
 235          /* occlusion query depends on shader discard/kill results */
 236          swrast->_DeferredTexture = GL_FALSE;
 237       }
 238       else {
 239          swrast->_DeferredTexture = GL_TRUE;
 240       }
 241    }
 242 }
 243
 244
 245 /**
 246  * Update swrast->_FogColor and swrast->_FogEnable values.
 247  */
 248 static void
 249 _swrast_update_fog_state( struct gl_context *ctx )
 250 {
 251    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 252    const struct gl_fragment_program *fp = ctx->FragmentProgram._Current;
 253
 254    assert(fp == NULL || fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB);
 255
 256    /* determine if fog is needed, and if so, which fog mode */
 257    swrast->_FogEnabled = (!_swrast_use_fragment_program(ctx) &&
 258                           ctx->Fog.Enabled);
 259 }
 260
 261
 262 /**
 263  * Update state for running fragment programs.  Basically, load the
 264  * program parameters with current state values.
 265  */
 266 static void
 267 _swrast_update_fragment_program(struct gl_context *ctx, GLbitfield newState)
 268 {
 269    if (!_swrast_use_fragment_program(ctx))
 270       return;
 271
 272    _mesa_load_state_parameters(ctx,
 273                                ctx->FragmentProgram._Current->Base.Parameters);
 274 }
 275
 276
 277 /**
 278  * See if we can do early diffuse+specular (primary+secondary) color
 279  * add per vertex instead of per-fragment.
 280  */
 281 static void
 282 _swrast_update_specular_vertex_add(struct gl_context *ctx)
 283 {
 284    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 285    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 286       (ctx->Light.Enabled &&
 287        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 288
 289    swrast->SpecularVertexAdd = (separateSpecular
 290                                 && ctx->Texture._EnabledUnits == 0x0
 291                                 && !_swrast_use_fragment_program(ctx)
 292                                 && !ctx->ATIFragmentShader._Enabled);
 293 }
 294
 295
 296 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 297                              _NEW_PROGRAM_CONSTANTS |   \
 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                               _MESA_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                           _MESA_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                            _MESA_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( struct gl_context *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( struct gl_context *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( struct gl_context *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(struct gl_context *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 static void
 426 _swrast_sleep( struct gl_context *ctx, GLbitfield new_state )
 427 {
 428    (void) ctx; (void) new_state;
 429 }
 430
 431
 432 static void
 433 _swrast_invalidate_state( struct gl_context *ctx, GLbitfield new_state )
 434 {
 435    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 436    GLuint i;
 437
 438    swrast->NewState |= new_state;
 439
 440    /* After 10 statechanges without any swrast functions being called,
 441     * put the module to sleep.
 442     */
 443    if (++swrast->StateChanges > 10) {
 444       swrast->InvalidateState = _swrast_sleep;
 445       swrast->NewState = ~0;
 446       new_state = ~0;
 447    }
 448
 449    if (new_state & swrast->InvalidateTriangleMask)
 450       swrast->Triangle = _swrast_validate_triangle;
 451
 452    if (new_state & swrast->InvalidateLineMask)
 453       swrast->Line = _swrast_validate_line;
 454
 455    if (new_state & swrast->InvalidatePointMask)
 456       swrast->Point = _swrast_validate_point;
 457
 458    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 459       swrast->BlendFunc = _swrast_validate_blend_func;
 460
 461    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 462       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 463          swrast->TextureSample[i] = NULL;
 464 }
 465
 466
 467 void
 468 _swrast_update_texture_samplers(struct gl_context *ctx)
 469 {
 470    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 471    GLuint u;
 472
 473    if (!swrast)
 474       return; /* pipe hack */
 475
 476    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 477       struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 478       /* Note: If tObj is NULL, the sample function will be a simple
 479        * function that just returns opaque black (0,0,0,1).
 480        */
 481       _mesa_update_fetch_functions(ctx, u);
 482       swrast->TextureSample[u] =
 483          _swrast_choose_texture_sample_func(ctx, tObj,
 484                                             _mesa_get_samplerobj(ctx, u));
 485    }
 486 }
 487
 488
 489 /**
 490  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 491  * swrast->_ActiveAtttribMask.
 492  */
 493 static void
 494 _swrast_update_active_attribs(struct gl_context *ctx)
 495 {
 496    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 497    GLbitfield64 attribsMask;
 498
 499    /*
 500     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 501     */
 502    if (_swrast_use_fragment_program(ctx)) {
 503       /* fragment program/shader */
 504       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 505       attribsMask &= ~VARYING_BIT_POS; /* WPOS is always handled specially */
 506    }
 507    else if (ctx->ATIFragmentShader._Enabled) {
 508       attribsMask = ~0;  /* XXX fix me */
 509    }
 510    else {
 511       /* fixed function */
 512       attribsMask = 0x0;
 513
 514 #if CHAN_TYPE == GL_FLOAT
 515       attribsMask |= VARYING_BIT_COL0;
 516 #endif
 517
 518       if (ctx->Fog.ColorSumEnabled ||
 519           (ctx->Light.Enabled &&
 520            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 521          attribsMask |= VARYING_BIT_COL1;
 522       }
 523
 524       if (swrast->_FogEnabled)
 525          attribsMask |= VARYING_BIT_FOGC;
 526
 527       attribsMask |= (ctx->Texture._EnabledUnits << VARYING_SLOT_TEX0);
 528    }
 529
 530    swrast->_ActiveAttribMask = attribsMask;
 531
 532    /* Update _ActiveAttribs[] list */
 533    {
 534       GLuint i, num = 0;
 535       for (i = 0; i < VARYING_SLOT_MAX; i++) {
 536          if (attribsMask & BITFIELD64_BIT(i)) {
 537             swrast->_ActiveAttribs[num++] = i;
 538             /* how should this attribute be interpolated? */
 539             if (i == VARYING_SLOT_COL0 || i == VARYING_SLOT_COL1)
 540                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 541             else
 542                swrast->_InterpMode[i] = GL_SMOOTH;
 543          }
 544       }
 545       swrast->_NumActiveAttribs = num;
 546    }
 547 }
 548
 549
 550 void
 551 _swrast_validate_derived( struct gl_context *ctx )
 552 {
 553    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 554
 555    if (swrast->NewState) {
 556       if (swrast->NewState & _NEW_POLYGON)
 557          _swrast_update_polygon( ctx );
 558
 559       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 560          _swrast_update_fog_hint( ctx );
 561
 562       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 563          _swrast_update_texture_env( ctx );
 564
 565       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 566          _swrast_update_fog_state( ctx );
 567
 568       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 569          _swrast_update_fragment_program( ctx, swrast->NewState );
 570
 571       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 572          _swrast_update_texture_samplers( ctx );
 573       }
 574
 575       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 576          _swrast_update_deferred_texture(ctx);
 577
 578       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 579          _swrast_update_rasterflags( ctx );
 580
 581       if (swrast->NewState & (_NEW_DEPTH |
 582                               _NEW_FOG |
 583                               _NEW_LIGHT |
 584                               _NEW_PROGRAM |
 585                               _NEW_TEXTURE))
 586          _swrast_update_active_attribs(ctx);
 587
 588       if (swrast->NewState & (_NEW_FOG |
 589                               _NEW_PROGRAM |
 590                               _NEW_LIGHT |
 591                               _NEW_TEXTURE))
 592          _swrast_update_specular_vertex_add(ctx);
 593
 594       swrast->NewState = 0;
 595       swrast->StateChanges = 0;
 596       swrast->InvalidateState = _swrast_invalidate_state;
 597    }
 598 }
 599
 600 #define SWRAST_DEBUG 0
 601
 602 /* Public entrypoints:  See also s_bitmap.c, etc.
 603  */
 604 void
 605 _swrast_Quad( struct gl_context *ctx,
 606               const SWvertex *v0, const SWvertex *v1,
 607               const SWvertex *v2, const SWvertex *v3 )
 608 {
 609    if (SWRAST_DEBUG) {
 610       _mesa_debug(ctx, "_swrast_Quad\n");
 611       _swrast_print_vertex( ctx, v0 );
 612       _swrast_print_vertex( ctx, v1 );
 613       _swrast_print_vertex( ctx, v2 );
 614       _swrast_print_vertex( ctx, v3 );
 615    }
 616    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 617    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 618 }
 619
 620 void
 621 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 622                   const SWvertex *v1, const SWvertex *v2 )
 623 {
 624    if (SWRAST_DEBUG) {
 625       _mesa_debug(ctx, "_swrast_Triangle\n");
 626       _swrast_print_vertex( ctx, v0 );
 627       _swrast_print_vertex( ctx, v1 );
 628       _swrast_print_vertex( ctx, v2 );
 629    }
 630    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 631 }
 632
 633 void
 634 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 635 {
 636    if (SWRAST_DEBUG) {
 637       _mesa_debug(ctx, "_swrast_Line\n");
 638       _swrast_print_vertex( ctx, v0 );
 639       _swrast_print_vertex( ctx, v1 );
 640    }
 641    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 642 }
 643
 644 void
 645 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 646 {
 647    if (SWRAST_DEBUG) {
 648       _mesa_debug(ctx, "_swrast_Point\n");
 649       _swrast_print_vertex( ctx, v0 );
 650    }
 651    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 652 }
 653
 654 void
 655 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 656 {
 657    if (SWRAST_DEBUG) {
 658       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 659    }
 660    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 661 }
 662
 663 void
 664 _swrast_ResetLineStipple( struct gl_context *ctx )
 665 {
 666    if (SWRAST_DEBUG) {
 667       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 668    }
 669    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 670 }
 671
 672 void
 673 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 674 {
 675    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 676 }
 677
 678 void
 679 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 680 {
 681    if (SWRAST_DEBUG) {
 682       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 683    }
 684    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 685    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 686 }
 687
 688 void
 689 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 690 {
 691    if (SWRAST_DEBUG) {
 692       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 693    }
 694    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 695    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 696 }
 697
 698
 699 /**
 700  * Initialize native program limits by copying the logical limits.
 701  * See comments in init_program_limits() in context.c
 702  */
 703 static void
 704 init_program_native_limits(struct gl_program_constants *prog)
 705 {
 706    prog->MaxNativeInstructions = prog->MaxInstructions;
 707    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 708    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 709    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 710    prog->MaxNativeAttribs = prog->MaxAttribs;
 711    prog->MaxNativeTemps = prog->MaxTemps;
 712    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 713    prog->MaxNativeParameters = prog->MaxParameters;
 714 }
 715
 716
 717 GLboolean
 718 _swrast_CreateContext( struct gl_context *ctx )
 719 {
 720    GLuint i;
 721    SWcontext *swrast = calloc(1, sizeof(SWcontext));
 722 #ifdef _OPENMP
 723    const GLuint maxThreads = omp_get_max_threads();
 724 #else
 725    const GLuint maxThreads = 1;
 726 #endif
 727
 728    assert(ctx->Const.MaxViewportWidth <= SWRAST_MAX_WIDTH);
 729    assert(ctx->Const.MaxViewportHeight <= SWRAST_MAX_WIDTH);
 730
 731    assert(ctx->Const.MaxRenderbufferSize <= SWRAST_MAX_WIDTH);
 732
 733    /* make sure largest texture image is <= SWRAST_MAX_WIDTH in size */
 734    assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 735    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 736    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 737
 738    assert(PROG_MAX_WIDTH == SWRAST_MAX_WIDTH);
 739
 740    if (SWRAST_DEBUG) {
 741       _mesa_debug(ctx, "_swrast_CreateContext\n");
 742    }
 743
 744    if (!swrast)
 745       return GL_FALSE;
 746
 747    swrast->NewState = ~0;
 748
 749    swrast->choose_point = _swrast_choose_point;
 750    swrast->choose_line = _swrast_choose_line;
 751    swrast->choose_triangle = _swrast_choose_triangle;
 752
 753    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 754    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 755    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 756
 757    swrast->Point = _swrast_validate_point;
 758    swrast->Line = _swrast_validate_line;
 759    swrast->Triangle = _swrast_validate_triangle;
 760    swrast->InvalidateState = _swrast_sleep;
 761    swrast->BlendFunc = _swrast_validate_blend_func;
 762
 763    swrast->AllowVertexFog = GL_TRUE;
 764    swrast->AllowPixelFog = GL_TRUE;
 765
 766    swrast->Driver.SpanRenderStart = _swrast_span_render_start;
 767    swrast->Driver.SpanRenderFinish = _swrast_span_render_finish;
 768
 769    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 770       swrast->TextureSample[i] = NULL;
 771
 772    /* SpanArrays is global and shared by all SWspan instances. However, when
 773     * using multiple threads, it is necessary to have one SpanArrays instance
 774     * per thread.
 775     */
 776    swrast->SpanArrays = malloc(maxThreads * sizeof(SWspanarrays));
 777    if (!swrast->SpanArrays) {
 778       free(swrast);
 779       return GL_FALSE;
 780    }
 781    for(i = 0; i < maxThreads; i++) {
 782       swrast->SpanArrays[i].ChanType = CHAN_TYPE;
 783 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 784       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba8;
 785 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 786       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba16;
 787 #else
 788       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].attribs[VARYING_SLOT_COL0];
 789 #endif
 790    }
 791
 792    /* init point span buffer */
 793    swrast->PointSpan.primitive = GL_POINT;
 794    swrast->PointSpan.end = 0;
 795    swrast->PointSpan.facing = 0;
 796    swrast->PointSpan.array = swrast->SpanArrays;
 797
 798    init_program_native_limits(&ctx->Const.VertexProgram);
 799    init_program_native_limits(&ctx->Const.GeometryProgram);
 800    init_program_native_limits(&ctx->Const.FragmentProgram);
 801
 802    ctx->swrast_context = swrast;
 803
 804    swrast->stencil_temp.buf1 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 805    swrast->stencil_temp.buf2 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 806    swrast->stencil_temp.buf3 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 807    swrast->stencil_temp.buf4 = malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 808
 809    if (!swrast->stencil_temp.buf1 ||
 810        !swrast->stencil_temp.buf2 ||
 811        !swrast->stencil_temp.buf3 ||
 812        !swrast->stencil_temp.buf4) {
 813       _swrast_DestroyContext(ctx);
 814       return GL_FALSE;
 815    }
 816
 817    return GL_TRUE;
 818 }
 819
 820 void
 821 _swrast_DestroyContext( struct gl_context *ctx )
 822 {
 823    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 824
 825    if (SWRAST_DEBUG) {
 826       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 827    }
 828
 829    free( swrast->SpanArrays );
 830    free( swrast->ZoomedArrays );
 831    free( swrast->TexelBuffer );
 832
 833    free(swrast->stencil_temp.buf1);
 834    free(swrast->stencil_temp.buf2);
 835    free(swrast->stencil_temp.buf3);
 836    free(swrast->stencil_temp.buf4);
 837
 838    free( swrast );
 839
 840    ctx->swrast_context = 0;
 841 }
 842
 843
 844 struct swrast_device_driver *
 845 _swrast_GetDeviceDriverReference( struct gl_context *ctx )
 846 {
 847    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 848    return &swrast->Driver;
 849 }
 850
 851 void
 852 _swrast_flush( struct gl_context *ctx )
 853 {
 854    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 855    /* flush any pending fragments from rendering points */
 856    if (swrast->PointSpan.end > 0) {
 857       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 858       swrast->PointSpan.end = 0;
 859    }
 860 }
 861
 862 void
 863 _swrast_render_primitive( struct gl_context *ctx, GLenum prim )
 864 {
 865    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 866    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 867       _swrast_flush(ctx);
 868    }
 869    swrast->Primitive = prim;
 870 }
 871
 872
 873 /** called via swrast->Driver.SpanRenderStart() */
 874 void
 875 _swrast_span_render_start(struct gl_context *ctx)
 876 {
 877    _swrast_map_textures(ctx);
 878    _swrast_map_renderbuffers(ctx);
 879 }
 880
 881
 882 /** called via swrast->Driver.SpanRenderFinish() */
 883 void
 884 _swrast_span_render_finish(struct gl_context *ctx)
 885 {
 886    _swrast_unmap_textures(ctx);
 887    _swrast_unmap_renderbuffers(ctx);
 888 }
 889
 890
 891 void
 892 _swrast_render_start( struct gl_context *ctx )
 893 {
 894    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 895    if (swrast->Driver.SpanRenderStart)
 896       swrast->Driver.SpanRenderStart( ctx );
 897    swrast->PointSpan.end = 0;
 898 }
 899
 900 void
 901 _swrast_render_finish( struct gl_context *ctx )
 902 {
 903    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 904
 905    _swrast_flush(ctx);
 906
 907    if (swrast->Driver.SpanRenderFinish)
 908       swrast->Driver.SpanRenderFinish( ctx );
 909 }
 910
 911
 912 #define SWRAST_DEBUG_VERTICES 0
 913
 914 void
 915 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 916 {
 917    GLuint i;
 918
 919    if (SWRAST_DEBUG_VERTICES) {
 920       _mesa_debug(ctx, "win %f %f %f %f\n",
 921                   v->attrib[VARYING_SLOT_POS][0],
 922                   v->attrib[VARYING_SLOT_POS][1],
 923                   v->attrib[VARYING_SLOT_POS][2],
 924                   v->attrib[VARYING_SLOT_POS][3]);
 925
 926       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 927          if (ctx->Texture.Unit[i]._ReallyEnabled)
 928             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 929                         v->attrib[VARYING_SLOT_TEX0 + i][0],
 930                         v->attrib[VARYING_SLOT_TEX0 + i][1],
 931                         v->attrib[VARYING_SLOT_TEX0 + i][2],
 932                         v->attrib[VARYING_SLOT_TEX0 + i][3]);
 933
 934 #if CHAN_TYPE == GL_FLOAT
 935       _mesa_debug(ctx, "color %f %f %f %f\n",
 936                   v->color[0], v->color[1], v->color[2], v->color[3]);
 937 #else
 938       _mesa_debug(ctx, "color %d %d %d %d\n",
 939                   v->color[0], v->color[1], v->color[2], v->color[3]);
 940 #endif
 941       _mesa_debug(ctx, "spec %g %g %g %g\n",
 942                   v->attrib[VARYING_SLOT_COL1][0],
 943                   v->attrib[VARYING_SLOT_COL1][1],
 944                   v->attrib[VARYING_SLOT_COL1][2],
 945                   v->attrib[VARYING_SLOT_COL1][3]);
 946       _mesa_debug(ctx, "fog %f\n", v->attrib[VARYING_SLOT_FOGC][0]);
 947       _mesa_debug(ctx, "index %f\n", v->attrib[VARYING_SLOT_CI][0]);
 948       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 949       _mesa_debug(ctx, "\n");
 950    }
 951 }