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/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) ||
 255           (fp->Base.Target == GL_FRAGMENT_PROGRAM_ARB) ||
 256           (fp->Base.Target == GL_FRAGMENT_PROGRAM_NV));
 257
 258    /* determine if fog is needed, and if so, which fog mode */
 259    swrast->_FogEnabled = (!_swrast_use_fragment_program(ctx) &&
 260                           ctx->Fog.Enabled);
 261 }
 262
 263
 264 /**
 265  * Update state for running fragment programs.  Basically, load the
 266  * program parameters with current state values.
 267  */
 268 static void
 269 _swrast_update_fragment_program(struct gl_context *ctx, GLbitfield newState)
 270 {
 271    if (!_swrast_use_fragment_program(ctx))
 272       return;
 273
 274    _mesa_load_state_parameters(ctx,
 275                                ctx->FragmentProgram._Current->Base.Parameters);
 276 }
 277
 278
 279 /**
 280  * See if we can do early diffuse+specular (primary+secondary) color
 281  * add per vertex instead of per-fragment.
 282  */
 283 static void
 284 _swrast_update_specular_vertex_add(struct gl_context *ctx)
 285 {
 286    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 287    GLboolean separateSpecular = ctx->Fog.ColorSumEnabled ||
 288       (ctx->Light.Enabled &&
 289        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR);
 290
 291    swrast->SpecularVertexAdd = (separateSpecular
 292                                 && ctx->Texture._EnabledUnits == 0x0
 293                                 && !_swrast_use_fragment_program(ctx)
 294                                 && !ctx->ATIFragmentShader._Enabled);
 295 }
 296
 297
 298 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 299                              _NEW_PROGRAM_CONSTANTS |   \
 300                              _NEW_TEXTURE |             \
 301                              _NEW_HINT |                \
 302                              _NEW_POLYGON )
 303
 304 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 305  */
 306 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 307                               _NEW_RENDERMODE|                  \
 308                               _NEW_POLYGON|                     \
 309                               _NEW_DEPTH|                       \
 310                               _NEW_STENCIL|                     \
 311                               _NEW_COLOR|                       \
 312                               _NEW_TEXTURE|                     \
 313                               _SWRAST_NEW_RASTERMASK|           \
 314                               _NEW_LIGHT|                       \
 315                               _NEW_FOG |                        \
 316                               _MESA_NEW_SEPARATE_SPECULAR)
 317
 318 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 319                           _NEW_RENDERMODE|              \
 320                           _NEW_LINE|                    \
 321                           _NEW_TEXTURE|                 \
 322                           _NEW_LIGHT|                   \
 323                           _NEW_FOG|                     \
 324                           _NEW_DEPTH |                  \
 325                           _MESA_NEW_SEPARATE_SPECULAR)
 326
 327 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 328                            _NEW_RENDERMODE |            \
 329                            _NEW_POINT |                 \
 330                            _NEW_TEXTURE |               \
 331                            _NEW_LIGHT |                 \
 332                            _NEW_FOG |                   \
 333                            _MESA_NEW_SEPARATE_SPECULAR)
 334
 335 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 336
 337 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 338
 339 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 340
 341
 342
 343 /**
 344  * Stub for swrast->Triangle to select a true triangle function
 345  * after a state change.
 346  */
 347 static void
 348 _swrast_validate_triangle( struct gl_context *ctx,
 349                            const SWvertex *v0,
 350                            const SWvertex *v1,
 351                            const SWvertex *v2 )
 352 {
 353    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 354
 355    _swrast_validate_derived( ctx );
 356    swrast->choose_triangle( ctx );
 357    ASSERT(swrast->Triangle);
 358
 359    if (swrast->SpecularVertexAdd) {
 360       /* separate specular color, but no texture */
 361       swrast->SpecTriangle = swrast->Triangle;
 362       swrast->Triangle = _swrast_add_spec_terms_triangle;
 363    }
 364
 365    swrast->Triangle( ctx, v0, v1, v2 );
 366 }
 367
 368 /**
 369  * Called via swrast->Line.  Examine current GL state and choose a software
 370  * line routine.  Then call it.
 371  */
 372 static void
 373 _swrast_validate_line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 374 {
 375    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 376
 377    _swrast_validate_derived( ctx );
 378    swrast->choose_line( ctx );
 379    ASSERT(swrast->Line);
 380
 381    if (swrast->SpecularVertexAdd) {
 382       swrast->SpecLine = swrast->Line;
 383       swrast->Line = _swrast_add_spec_terms_line;
 384    }
 385
 386    swrast->Line( ctx, v0, v1 );
 387 }
 388
 389 /**
 390  * Called via swrast->Point.  Examine current GL state and choose a software
 391  * point routine.  Then call it.
 392  */
 393 static void
 394 _swrast_validate_point( struct gl_context *ctx, const SWvertex *v0 )
 395 {
 396    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 397
 398    _swrast_validate_derived( ctx );
 399    swrast->choose_point( ctx );
 400
 401    if (swrast->SpecularVertexAdd) {
 402       swrast->SpecPoint = swrast->Point;
 403       swrast->Point = _swrast_add_spec_terms_point;
 404    }
 405
 406    swrast->Point( ctx, v0 );
 407 }
 408
 409
 410 /**
 411  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 412  * function, then call it.
 413  */
 414 static void _ASMAPI
 415 _swrast_validate_blend_func(struct gl_context *ctx, GLuint n, const GLubyte mask[],
 416                             GLvoid *src, const GLvoid *dst,
 417                             GLenum chanType )
 418 {
 419    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 420
 421    _swrast_validate_derived( ctx ); /* why is this needed? */
 422    _swrast_choose_blend_func( ctx, chanType );
 423
 424    swrast->BlendFunc( ctx, n, mask, src, dst, chanType );
 425 }
 426
 427 static void
 428 _swrast_sleep( struct gl_context *ctx, GLbitfield new_state )
 429 {
 430    (void) ctx; (void) new_state;
 431 }
 432
 433
 434 static void
 435 _swrast_invalidate_state( struct gl_context *ctx, GLbitfield new_state )
 436 {
 437    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 438    GLuint i;
 439
 440    swrast->NewState |= new_state;
 441
 442    /* After 10 statechanges without any swrast functions being called,
 443     * put the module to sleep.
 444     */
 445    if (++swrast->StateChanges > 10) {
 446       swrast->InvalidateState = _swrast_sleep;
 447       swrast->NewState = ~0;
 448       new_state = ~0;
 449    }
 450
 451    if (new_state & swrast->InvalidateTriangleMask)
 452       swrast->Triangle = _swrast_validate_triangle;
 453
 454    if (new_state & swrast->InvalidateLineMask)
 455       swrast->Line = _swrast_validate_line;
 456
 457    if (new_state & swrast->InvalidatePointMask)
 458       swrast->Point = _swrast_validate_point;
 459
 460    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 461       swrast->BlendFunc = _swrast_validate_blend_func;
 462
 463    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 464       for (i = 0 ; i < ctx->Const.MaxTextureImageUnits ; i++)
 465          swrast->TextureSample[i] = NULL;
 466 }
 467
 468
 469 void
 470 _swrast_update_texture_samplers(struct gl_context *ctx)
 471 {
 472    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 473    GLuint u;
 474
 475    if (!swrast)
 476       return; /* pipe hack */
 477
 478    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 479       struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 480       /* Note: If tObj is NULL, the sample function will be a simple
 481        * function that just returns opaque black (0,0,0,1).
 482        */
 483       if (tObj) {
 484          _mesa_update_fetch_functions(tObj);
 485       }
 486       swrast->TextureSample[u] =
 487          _swrast_choose_texture_sample_func(ctx, tObj,
 488                                             _mesa_get_samplerobj(ctx, u));
 489    }
 490 }
 491
 492
 493 /**
 494  * Update swrast->_ActiveAttribs, swrast->_NumActiveAttribs,
 495  * swrast->_ActiveAtttribMask.
 496  */
 497 static void
 498 _swrast_update_active_attribs(struct gl_context *ctx)
 499 {
 500    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 501    GLbitfield64 attribsMask;
 502
 503    /*
 504     * Compute _ActiveAttribsMask = which fragment attributes are needed.
 505     */
 506    if (_swrast_use_fragment_program(ctx)) {
 507       /* fragment program/shader */
 508       attribsMask = ctx->FragmentProgram._Current->Base.InputsRead;
 509       attribsMask &= ~FRAG_BIT_WPOS; /* WPOS is always handled specially */
 510    }
 511    else if (ctx->ATIFragmentShader._Enabled) {
 512       attribsMask = ~0;  /* XXX fix me */
 513    }
 514    else {
 515       /* fixed function */
 516       attribsMask = 0x0;
 517
 518 #if CHAN_TYPE == GL_FLOAT
 519       attribsMask |= FRAG_BIT_COL0;
 520 #endif
 521
 522       if (ctx->Fog.ColorSumEnabled ||
 523           (ctx->Light.Enabled &&
 524            ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)) {
 525          attribsMask |= FRAG_BIT_COL1;
 526       }
 527
 528       if (swrast->_FogEnabled)
 529          attribsMask |= FRAG_BIT_FOGC;
 530
 531       attribsMask |= (ctx->Texture._EnabledUnits << FRAG_ATTRIB_TEX0);
 532    }
 533
 534    swrast->_ActiveAttribMask = attribsMask;
 535
 536    /* Update _ActiveAttribs[] list */
 537    {
 538       GLuint i, num = 0;
 539       for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
 540          if (attribsMask & BITFIELD64_BIT(i)) {
 541             swrast->_ActiveAttribs[num++] = i;
 542             /* how should this attribute be interpolated? */
 543             if (i == FRAG_ATTRIB_COL0 || i == FRAG_ATTRIB_COL1)
 544                swrast->_InterpMode[i] = ctx->Light.ShadeModel;
 545             else
 546                swrast->_InterpMode[i] = GL_SMOOTH;
 547          }
 548       }
 549       swrast->_NumActiveAttribs = num;
 550    }
 551 }
 552
 553
 554 void
 555 _swrast_validate_derived( struct gl_context *ctx )
 556 {
 557    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 558
 559    if (swrast->NewState) {
 560       if (swrast->NewState & _NEW_POLYGON)
 561          _swrast_update_polygon( ctx );
 562
 563       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 564          _swrast_update_fog_hint( ctx );
 565
 566       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 567          _swrast_update_texture_env( ctx );
 568
 569       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 570          _swrast_update_fog_state( ctx );
 571
 572       if (swrast->NewState & (_NEW_PROGRAM_CONSTANTS | _NEW_PROGRAM))
 573          _swrast_update_fragment_program( ctx, swrast->NewState );
 574
 575       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM)) {
 576          _swrast_update_texture_samplers( ctx );
 577       }
 578
 579       if (swrast->NewState & (_NEW_COLOR | _NEW_PROGRAM))
 580          _swrast_update_deferred_texture(ctx);
 581
 582       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 583          _swrast_update_rasterflags( ctx );
 584
 585       if (swrast->NewState & (_NEW_DEPTH |
 586                               _NEW_FOG |
 587                               _NEW_LIGHT |
 588                               _NEW_PROGRAM |
 589                               _NEW_TEXTURE))
 590          _swrast_update_active_attribs(ctx);
 591
 592       if (swrast->NewState & (_NEW_FOG |
 593                               _NEW_PROGRAM |
 594                               _NEW_LIGHT |
 595                               _NEW_TEXTURE))
 596          _swrast_update_specular_vertex_add(ctx);
 597
 598       swrast->NewState = 0;
 599       swrast->StateChanges = 0;
 600       swrast->InvalidateState = _swrast_invalidate_state;
 601    }
 602 }
 603
 604 #define SWRAST_DEBUG 0
 605
 606 /* Public entrypoints:  See also s_bitmap.c, etc.
 607  */
 608 void
 609 _swrast_Quad( struct gl_context *ctx,
 610               const SWvertex *v0, const SWvertex *v1,
 611               const SWvertex *v2, const SWvertex *v3 )
 612 {
 613    if (SWRAST_DEBUG) {
 614       _mesa_debug(ctx, "_swrast_Quad\n");
 615       _swrast_print_vertex( ctx, v0 );
 616       _swrast_print_vertex( ctx, v1 );
 617       _swrast_print_vertex( ctx, v2 );
 618       _swrast_print_vertex( ctx, v3 );
 619    }
 620    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 621    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 622 }
 623
 624 void
 625 _swrast_Triangle( struct gl_context *ctx, const SWvertex *v0,
 626                   const SWvertex *v1, const SWvertex *v2 )
 627 {
 628    if (SWRAST_DEBUG) {
 629       _mesa_debug(ctx, "_swrast_Triangle\n");
 630       _swrast_print_vertex( ctx, v0 );
 631       _swrast_print_vertex( ctx, v1 );
 632       _swrast_print_vertex( ctx, v2 );
 633    }
 634    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 635 }
 636
 637 void
 638 _swrast_Line( struct gl_context *ctx, const SWvertex *v0, const SWvertex *v1 )
 639 {
 640    if (SWRAST_DEBUG) {
 641       _mesa_debug(ctx, "_swrast_Line\n");
 642       _swrast_print_vertex( ctx, v0 );
 643       _swrast_print_vertex( ctx, v1 );
 644    }
 645    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 646 }
 647
 648 void
 649 _swrast_Point( struct gl_context *ctx, const SWvertex *v0 )
 650 {
 651    if (SWRAST_DEBUG) {
 652       _mesa_debug(ctx, "_swrast_Point\n");
 653       _swrast_print_vertex( ctx, v0 );
 654    }
 655    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 656 }
 657
 658 void
 659 _swrast_InvalidateState( struct gl_context *ctx, GLbitfield new_state )
 660 {
 661    if (SWRAST_DEBUG) {
 662       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 663    }
 664    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 665 }
 666
 667 void
 668 _swrast_ResetLineStipple( struct gl_context *ctx )
 669 {
 670    if (SWRAST_DEBUG) {
 671       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 672    }
 673    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 674 }
 675
 676 void
 677 _swrast_SetFacing(struct gl_context *ctx, GLuint facing)
 678 {
 679    SWRAST_CONTEXT(ctx)->PointLineFacing = facing;
 680 }
 681
 682 void
 683 _swrast_allow_vertex_fog( struct gl_context *ctx, GLboolean value )
 684 {
 685    if (SWRAST_DEBUG) {
 686       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 687    }
 688    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 689    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 690 }
 691
 692 void
 693 _swrast_allow_pixel_fog( struct gl_context *ctx, GLboolean value )
 694 {
 695    if (SWRAST_DEBUG) {
 696       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 697    }
 698    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 699    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 700 }
 701
 702
 703 /**
 704  * Initialize native program limits by copying the logical limits.
 705  * See comments in init_program_limits() in context.c
 706  */
 707 static void
 708 init_program_native_limits(struct gl_program_constants *prog)
 709 {
 710    prog->MaxNativeInstructions = prog->MaxInstructions;
 711    prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
 712    prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
 713    prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
 714    prog->MaxNativeAttribs = prog->MaxAttribs;
 715    prog->MaxNativeTemps = prog->MaxTemps;
 716    prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
 717    prog->MaxNativeParameters = prog->MaxParameters;
 718 }
 719
 720
 721 GLboolean
 722 _swrast_CreateContext( struct gl_context *ctx )
 723 {
 724    GLuint i;
 725    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 726 #ifdef _OPENMP
 727    const GLuint maxThreads = omp_get_max_threads();
 728 #else
 729    const GLuint maxThreads = 1;
 730 #endif
 731
 732    assert(ctx->Const.MaxViewportWidth <= SWRAST_MAX_WIDTH);
 733    assert(ctx->Const.MaxViewportHeight <= SWRAST_MAX_WIDTH);
 734
 735    assert(ctx->Const.MaxRenderbufferSize <= SWRAST_MAX_WIDTH);
 736
 737    /* make sure largest texture image is <= SWRAST_MAX_WIDTH in size */
 738    assert((1 << (ctx->Const.MaxTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 739    assert((1 << (ctx->Const.MaxCubeTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 740    assert((1 << (ctx->Const.Max3DTextureLevels - 1)) <= SWRAST_MAX_WIDTH);
 741
 742    assert(PROG_MAX_WIDTH == SWRAST_MAX_WIDTH);
 743
 744    if (SWRAST_DEBUG) {
 745       _mesa_debug(ctx, "_swrast_CreateContext\n");
 746    }
 747
 748    if (!swrast)
 749       return GL_FALSE;
 750
 751    swrast->NewState = ~0;
 752
 753    swrast->choose_point = _swrast_choose_point;
 754    swrast->choose_line = _swrast_choose_line;
 755    swrast->choose_triangle = _swrast_choose_triangle;
 756
 757    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 758    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 759    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 760
 761    swrast->Point = _swrast_validate_point;
 762    swrast->Line = _swrast_validate_line;
 763    swrast->Triangle = _swrast_validate_triangle;
 764    swrast->InvalidateState = _swrast_sleep;
 765    swrast->BlendFunc = _swrast_validate_blend_func;
 766
 767    swrast->AllowVertexFog = GL_TRUE;
 768    swrast->AllowPixelFog = GL_TRUE;
 769
 770    swrast->Driver.SpanRenderStart = _swrast_span_render_start;
 771    swrast->Driver.SpanRenderFinish = _swrast_span_render_finish;
 772
 773    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 774       swrast->TextureSample[i] = NULL;
 775
 776    /* SpanArrays is global and shared by all SWspan instances. However, when
 777     * using multiple threads, it is necessary to have one SpanArrays instance
 778     * per thread.
 779     */
 780    swrast->SpanArrays = (SWspanarrays *) MALLOC(maxThreads * sizeof(SWspanarrays));
 781    if (!swrast->SpanArrays) {
 782       FREE(swrast);
 783       return GL_FALSE;
 784    }
 785    for(i = 0; i < maxThreads; i++) {
 786       swrast->SpanArrays[i].ChanType = CHAN_TYPE;
 787 #if CHAN_TYPE == GL_UNSIGNED_BYTE
 788       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba8;
 789 #elif CHAN_TYPE == GL_UNSIGNED_SHORT
 790       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].rgba16;
 791 #else
 792       swrast->SpanArrays[i].rgba = swrast->SpanArrays[i].attribs[FRAG_ATTRIB_COL0];
 793 #endif
 794    }
 795
 796    /* init point span buffer */
 797    swrast->PointSpan.primitive = GL_POINT;
 798    swrast->PointSpan.end = 0;
 799    swrast->PointSpan.facing = 0;
 800    swrast->PointSpan.array = swrast->SpanArrays;
 801
 802    init_program_native_limits(&ctx->Const.VertexProgram);
 803    init_program_native_limits(&ctx->Const.GeometryProgram);
 804    init_program_native_limits(&ctx->Const.FragmentProgram);
 805
 806    ctx->swrast_context = swrast;
 807
 808    swrast->stencil_temp.buf1 = (GLubyte *) malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 809    swrast->stencil_temp.buf2 = (GLubyte *) malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 810    swrast->stencil_temp.buf3 = (GLubyte *) malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 811    swrast->stencil_temp.buf4 = (GLubyte *) malloc(SWRAST_MAX_WIDTH * sizeof(GLubyte));
 812
 813    if (!swrast->stencil_temp.buf1 ||
 814        !swrast->stencil_temp.buf2 ||
 815        !swrast->stencil_temp.buf3 ||
 816        !swrast->stencil_temp.buf4) {
 817       _swrast_DestroyContext(ctx);
 818       return GL_FALSE;
 819    }
 820
 821    return GL_TRUE;
 822 }
 823
 824 void
 825 _swrast_DestroyContext( struct gl_context *ctx )
 826 {
 827    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 828
 829    if (SWRAST_DEBUG) {
 830       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 831    }
 832
 833    FREE( swrast->SpanArrays );
 834    if (swrast->ZoomedArrays)
 835       FREE( swrast->ZoomedArrays );
 836    FREE( swrast->TexelBuffer );
 837
 838    free(swrast->stencil_temp.buf1);
 839    free(swrast->stencil_temp.buf2);
 840    free(swrast->stencil_temp.buf3);
 841    free(swrast->stencil_temp.buf4);
 842
 843    FREE( swrast );
 844
 845    ctx->swrast_context = 0;
 846 }
 847
 848
 849 struct swrast_device_driver *
 850 _swrast_GetDeviceDriverReference( struct gl_context *ctx )
 851 {
 852    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 853    return &swrast->Driver;
 854 }
 855
 856 void
 857 _swrast_flush( struct gl_context *ctx )
 858 {
 859    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 860    /* flush any pending fragments from rendering points */
 861    if (swrast->PointSpan.end > 0) {
 862       _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 863       swrast->PointSpan.end = 0;
 864    }
 865 }
 866
 867 void
 868 _swrast_render_primitive( struct gl_context *ctx, GLenum prim )
 869 {
 870    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 871    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 872       _swrast_flush(ctx);
 873    }
 874    swrast->Primitive = prim;
 875 }
 876
 877
 878 /** called via swrast->Driver.SpanRenderStart() */
 879 void
 880 _swrast_span_render_start(struct gl_context *ctx)
 881 {
 882    _swrast_map_textures(ctx);
 883    _swrast_map_renderbuffers(ctx);
 884 }
 885
 886
 887 /** called via swrast->Driver.SpanRenderFinish() */
 888 void
 889 _swrast_span_render_finish(struct gl_context *ctx)
 890 {
 891    _swrast_unmap_textures(ctx);
 892    _swrast_unmap_renderbuffers(ctx);
 893 }
 894
 895
 896 void
 897 _swrast_render_start( struct gl_context *ctx )
 898 {
 899    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 900    if (swrast->Driver.SpanRenderStart)
 901       swrast->Driver.SpanRenderStart( ctx );
 902    swrast->PointSpan.end = 0;
 903 }
 904
 905 void
 906 _swrast_render_finish( struct gl_context *ctx )
 907 {
 908    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 909
 910    _swrast_flush(ctx);
 911
 912    if (swrast->Driver.SpanRenderFinish)
 913       swrast->Driver.SpanRenderFinish( ctx );
 914 }
 915
 916
 917 #define SWRAST_DEBUG_VERTICES 0
 918
 919 void
 920 _swrast_print_vertex( struct gl_context *ctx, const SWvertex *v )
 921 {
 922    GLuint i;
 923
 924    if (SWRAST_DEBUG_VERTICES) {
 925       _mesa_debug(ctx, "win %f %f %f %f\n",
 926                   v->attrib[FRAG_ATTRIB_WPOS][0],
 927                   v->attrib[FRAG_ATTRIB_WPOS][1],
 928                   v->attrib[FRAG_ATTRIB_WPOS][2],
 929                   v->attrib[FRAG_ATTRIB_WPOS][3]);
 930
 931       for (i = 0 ; i < ctx->Const.MaxTextureCoordUnits ; i++)
 932          if (ctx->Texture.Unit[i]._ReallyEnabled)
 933             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 934                         v->attrib[FRAG_ATTRIB_TEX0 + i][0],
 935                         v->attrib[FRAG_ATTRIB_TEX0 + i][1],
 936                         v->attrib[FRAG_ATTRIB_TEX0 + i][2],
 937                         v->attrib[FRAG_ATTRIB_TEX0 + i][3]);
 938
 939 #if CHAN_TYPE == GL_FLOAT
 940       _mesa_debug(ctx, "color %f %f %f %f\n",
 941                   v->color[0], v->color[1], v->color[2], v->color[3]);
 942 #else
 943       _mesa_debug(ctx, "color %d %d %d %d\n",
 944                   v->color[0], v->color[1], v->color[2], v->color[3]);
 945 #endif
 946       _mesa_debug(ctx, "spec %g %g %g %g\n",
 947                   v->attrib[FRAG_ATTRIB_COL1][0],
 948                   v->attrib[FRAG_ATTRIB_COL1][1],
 949                   v->attrib[FRAG_ATTRIB_COL1][2],
 950                   v->attrib[FRAG_ATTRIB_COL1][3]);
 951       _mesa_debug(ctx, "fog %f\n", v->attrib[FRAG_ATTRIB_FOGC][0]);
 952       _mesa_debug(ctx, "index %f\n", v->attrib[FRAG_ATTRIB_CI][0]);
 953       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 954       _mesa_debug(ctx, "\n");
 955    }
 956 }