src/mesa/swrast/s_context.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  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 "imports.h"
  30 #include "bufferobj.h"
  31 #include "context.h"
  32 #include "colormac.h"
  33 #include "mtypes.h"
  34 #include "program.h"
  35 #include "teximage.h"
  36 #include "swrast.h"
  37 #include "s_blend.h"
  38 #include "s_context.h"
  39 #include "s_lines.h"
  40 #include "s_points.h"
  41 #include "s_span.h"
  42 #include "s_triangle.h"
  43 #include "s_texfilter.h"
  44
  45
  46 /**
  47  * Recompute the value of swrast->_RasterMask, etc. according to
  48  * the current context.  The _RasterMask field can be easily tested by
  49  * drivers to determine certain basic GL state (does the primitive need
  50  * stenciling, logic-op, fog, etc?).
  51  */
  52 static void
  53 _swrast_update_rasterflags( GLcontext *ctx )
  54 {
  55    SWcontext *swrast = SWRAST_CONTEXT(ctx);
  56    GLbitfield rasterMask = 0;
  57
  58    if (ctx->Color.AlphaEnabled)           rasterMask |= ALPHATEST_BIT;
  59    if (ctx->Color.BlendEnabled)           rasterMask |= BLEND_BIT;
  60    if (ctx->Depth.Test)                   rasterMask |= DEPTH_BIT;
  61    if (swrast->_FogEnabled)               rasterMask |= FOG_BIT;
  62    if (ctx->Scissor.Enabled)              rasterMask |= CLIP_BIT;
  63    if (ctx->Stencil.Enabled)              rasterMask |= STENCIL_BIT;
  64    if (ctx->Visual.rgbMode) {
  65       const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
  66       if (colorMask != 0xffffffff)        rasterMask |= MASKING_BIT;
  67       if (ctx->Color._LogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  68       if (ctx->Texture._EnabledUnits)     rasterMask |= TEXTURE_BIT;
  69    }
  70    else {
  71       if (ctx->Color.IndexMask != 0xffffffff) rasterMask |= MASKING_BIT;
  72       if (ctx->Color.IndexLogicOpEnabled)     rasterMask |= LOGIC_OP_BIT;
  73    }
  74
  75    if (   ctx->Viewport.X < 0
  76        || ctx->Viewport.X + ctx->Viewport.Width > (GLint) ctx->DrawBuffer->Width
  77        || ctx->Viewport.Y < 0
  78        || ctx->Viewport.Y + ctx->Viewport.Height > (GLint) ctx->DrawBuffer->Height) {
  79       rasterMask |= CLIP_BIT;
  80    }
  81
  82    if (ctx->Query.CurrentOcclusionObject)
  83       rasterMask |= OCCLUSION_BIT;
  84
  85
  86    /* If we're not drawing to exactly one color buffer set the
  87     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  88     * buffers or the RGBA or CI mask disables all writes.
  89     */
  90    if (ctx->DrawBuffer->_NumColorDrawBuffers[0] != 1) {
  91       /* more than one color buffer designated for writing (or zero buffers) */
  92       rasterMask |= MULTI_DRAW_BIT;
  93    }
  94    else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
  95       rasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
  96    }
  97    else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
  98       rasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
  99    }
 100
 101    if (ctx->FragmentProgram._Active) {
 102       rasterMask |= FRAGPROG_BIT;
 103    }
 104
 105    if (ctx->ShaderObjects._FragmentShaderPresent) {
 106       rasterMask |= FRAGPROG_BIT;
 107    }
 108
 109    if (ctx->ATIFragmentShader._Enabled) {
 110       rasterMask |= ATIFRAGSHADER_BIT;
 111    }
 112
 113 #if CHAN_TYPE == GL_FLOAT
 114    if (ctx->Color.ClampFragmentColor == GL_TRUE) {
 115       rasterMask |= CLAMPING_BIT;
 116    }
 117 #endif
 118
 119    SWRAST_CONTEXT(ctx)->_RasterMask = rasterMask;
 120 }
 121
 122
 123 /**
 124  * Examine polycon culls tate to compute the _BackfaceSign field.
 125  * _BackfaceSign will be 0 if no culling, -1 if culling back-faces,
 126  * and 1 if culling front-faces.  The Polygon FrontFace state also
 127  * factors in.
 128  */
 129 static void
 130 _swrast_update_polygon( GLcontext *ctx )
 131 {
 132    GLfloat backface_sign = 1;
 133
 134    if (ctx->Polygon.CullFlag) {
 135       backface_sign = 1;
 136       switch(ctx->Polygon.CullFaceMode) {
 137       case GL_BACK:
 138          if(ctx->Polygon.FrontFace==GL_CCW)
 139             backface_sign = -1;
 140          break;
 141       case GL_FRONT:
 142          if(ctx->Polygon.FrontFace!=GL_CCW)
 143             backface_sign = -1;
 144          break;
 145       default:
 146       case GL_FRONT_AND_BACK:
 147          backface_sign = 0;
 148          break;
 149       }
 150    }
 151    else {
 152       backface_sign = 0;
 153    }
 154
 155    SWRAST_CONTEXT(ctx)->_BackfaceSign = backface_sign;
 156 }
 157
 158
 159 /**
 160  * Update the _PreferPixelFog field to indicate if we need to compute
 161  * fog factors per-fragment.
 162  */
 163 static void
 164 _swrast_update_fog_hint( GLcontext *ctx )
 165 {
 166    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 167    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 168                               ctx->FragmentProgram._Enabled || /* not _Active! */
 169                               (ctx->Hint.Fog == GL_NICEST &&
 170                                swrast->AllowPixelFog));
 171 }
 172
 173
 174
 175 /**
 176  * Update the swrast->_AnyTextureCombine flag.
 177  */
 178 static void
 179 _swrast_update_texture_env( GLcontext *ctx )
 180 {
 181    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 182    GLuint i;
 183    swrast->_AnyTextureCombine = GL_FALSE;
 184    for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 185       if (ctx->Texture.Unit[i].EnvMode == GL_COMBINE_EXT ||
 186           ctx->Texture.Unit[i].EnvMode == GL_COMBINE4_NV) {
 187          swrast->_AnyTextureCombine = GL_TRUE;
 188          return;
 189       }
 190    }
 191 }
 192
 193
 194 /**
 195  * Update swrast->_FogColor and swrast->_FogEnable values.
 196  */
 197 static void
 198 _swrast_update_fog_state( GLcontext *ctx )
 199 {
 200    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 201
 202    /* convert fog color to GLchan values */
 203    CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[RCOMP], ctx->Fog.Color[RCOMP]);
 204    CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[GCOMP], ctx->Fog.Color[GCOMP]);
 205    CLAMPED_FLOAT_TO_CHAN(swrast->_FogColor[BCOMP], ctx->Fog.Color[BCOMP]);
 206
 207    /* determine if fog is needed, and if so, which fog mode */
 208    swrast->_FogEnabled = GL_FALSE;
 209    if (ctx->FragmentProgram._Active) {
 210       if (ctx->FragmentProgram._Current->Base.Target==GL_FRAGMENT_PROGRAM_ARB) {
 211          const struct fragment_program *p
 212             = (struct fragment_program *) ctx->FragmentProgram._Current;
 213          if (p->FogOption != GL_NONE) {
 214             swrast->_FogEnabled = GL_TRUE;
 215             swrast->_FogMode = p->FogOption;
 216          }
 217       }
 218    }
 219    else if (ctx->Fog.Enabled) {
 220       swrast->_FogEnabled = GL_TRUE;
 221       swrast->_FogMode = ctx->Fog.Mode;
 222    }
 223 }
 224
 225
 226 /**
 227  * Update state for running fragment programs.  Basically, load the
 228  * program parameters with current state values.
 229  */
 230 static void
 231 _swrast_update_fragment_program( GLcontext *ctx )
 232 {
 233    if (ctx->FragmentProgram._Active) {
 234       struct fragment_program *program = ctx->FragmentProgram._Current;
 235       _mesa_load_state_parameters(ctx, program->Base.Parameters);
 236    }
 237 }
 238
 239
 240
 241 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 242                              _NEW_TEXTURE |             \
 243                              _NEW_HINT |                \
 244                              _NEW_POLYGON )
 245
 246 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 247  */
 248 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 249                               _NEW_RENDERMODE|                  \
 250                               _NEW_POLYGON|                     \
 251                               _NEW_DEPTH|                       \
 252                               _NEW_STENCIL|                     \
 253                               _NEW_COLOR|                       \
 254                               _NEW_TEXTURE|                     \
 255                               _SWRAST_NEW_RASTERMASK|           \
 256                               _NEW_LIGHT|                       \
 257                               _NEW_FOG |                        \
 258                               _DD_NEW_SEPARATE_SPECULAR)
 259
 260 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 261                           _NEW_RENDERMODE|              \
 262                           _NEW_LINE|                    \
 263                           _NEW_TEXTURE|                 \
 264                           _NEW_LIGHT|                   \
 265                           _NEW_FOG|                     \
 266                           _NEW_DEPTH |                  \
 267                           _DD_NEW_SEPARATE_SPECULAR)
 268
 269 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 270                            _NEW_RENDERMODE |            \
 271                            _NEW_POINT |                 \
 272                            _NEW_TEXTURE |               \
 273                            _NEW_LIGHT |                 \
 274                            _NEW_FOG |                   \
 275                            _DD_NEW_SEPARATE_SPECULAR)
 276
 277 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 278
 279 #define _SWRAST_NEW_TEXTURE_ENV_MODE _NEW_TEXTURE
 280
 281 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 282
 283
 284
 285 /**
 286  * Stub for swrast->Triangle to select a true triangle function
 287  * after a state change.
 288  */
 289 static void
 290 _swrast_validate_triangle( GLcontext *ctx,
 291                            const SWvertex *v0,
 292                            const SWvertex *v1,
 293                            const SWvertex *v2 )
 294 {
 295    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 296
 297    _swrast_validate_derived( ctx );
 298    swrast->choose_triangle( ctx );
 299
 300    if (ctx->Texture._EnabledUnits == 0
 301        && NEED_SECONDARY_COLOR(ctx)
 302        && !ctx->FragmentProgram._Active) {
 303       /* separate specular color, but no texture */
 304       swrast->SpecTriangle = swrast->Triangle;
 305       swrast->Triangle = _swrast_add_spec_terms_triangle;
 306    }
 307
 308    swrast->Triangle( ctx, v0, v1, v2 );
 309 }
 310
 311 /**
 312  * Called via swrast->Line.  Examine current GL state and choose a software
 313  * line routine.  Then call it.
 314  */
 315 static void
 316 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 317 {
 318    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 319
 320    _swrast_validate_derived( ctx );
 321    swrast->choose_line( ctx );
 322
 323    if (ctx->Texture._EnabledUnits == 0
 324        && NEED_SECONDARY_COLOR(ctx)
 325        && !ctx->FragmentProgram._Active) {
 326       swrast->SpecLine = swrast->Line;
 327       swrast->Line = _swrast_add_spec_terms_line;
 328    }
 329
 330
 331    swrast->Line( ctx, v0, v1 );
 332 }
 333
 334 /**
 335  * Called via swrast->Point.  Examine current GL state and choose a software
 336  * point routine.  Then call it.
 337  */
 338 static void
 339 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 340 {
 341    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 342
 343    _swrast_validate_derived( ctx );
 344    swrast->choose_point( ctx );
 345
 346    if (ctx->Texture._EnabledUnits == 0
 347        && NEED_SECONDARY_COLOR(ctx)
 348        && !ctx->FragmentProgram._Active) {
 349       swrast->SpecPoint = swrast->Point;
 350       swrast->Point = _swrast_add_spec_terms_point;
 351    }
 352
 353    swrast->Point( ctx, v0 );
 354 }
 355
 356
 357 /**
 358  * Called via swrast->BlendFunc.  Examine GL state to choose a blending
 359  * function, then call it.
 360  */
 361 static void _ASMAPI
 362 _swrast_validate_blend_func( GLcontext *ctx, GLuint n,
 363                              const GLubyte mask[],
 364                              GLchan src[][4],
 365                              CONST GLchan dst[][4] )
 366 {
 367    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 368
 369    _swrast_validate_derived( ctx );
 370    _swrast_choose_blend_func( ctx );
 371
 372    swrast->BlendFunc( ctx, n, mask, src, dst );
 373 }
 374
 375
 376 /**
 377  * Make sure we have texture image data for all the textures we may need
 378  * for subsequent rendering.
 379  */
 380 static void
 381 _swrast_validate_texture_images(GLcontext *ctx)
 382 {
 383    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 384    GLuint u;
 385
 386    if (!swrast->ValidateTextureImage || !ctx->Texture._EnabledUnits) {
 387       /* no textures enabled, or no way to validate images! */
 388       return;
 389    }
 390
 391    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 392       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 393          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 394          ASSERT(texObj);
 395          if (texObj) {
 396             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 397             GLuint face;
 398             for (face = 0; face < numFaces; face++) {
 399                GLuint lvl;
 400                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 401                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 402                   if (texImg && !texImg->Data) {
 403                      swrast->ValidateTextureImage(ctx, texObj, face, lvl);
 404                      ASSERT(texObj->Image[face][lvl]->Data);
 405                   }
 406                }
 407             }
 408          }
 409       }
 410    }
 411 }
 412
 413
 414 /**
 415  * Free the texture image data attached to all currently enabled
 416  * textures.  Meant to be called by device drivers when transitioning
 417  * from software to hardware rendering.
 418  */
 419 void
 420 _swrast_eject_texture_images(GLcontext *ctx)
 421 {
 422    GLuint u;
 423
 424    if (!ctx->Texture._EnabledUnits) {
 425       /* no textures enabled */
 426       return;
 427    }
 428
 429    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 430       if (ctx->Texture.Unit[u]._ReallyEnabled) {
 431          struct gl_texture_object *texObj = ctx->Texture.Unit[u]._Current;
 432          ASSERT(texObj);
 433          if (texObj) {
 434             GLuint numFaces = (texObj->Target == GL_TEXTURE_CUBE_MAP) ? 6 : 1;
 435             GLuint face;
 436             for (face = 0; face < numFaces; face++) {
 437                GLuint lvl;
 438                for (lvl = texObj->BaseLevel; lvl <= texObj->_MaxLevel; lvl++) {
 439                   struct gl_texture_image *texImg = texObj->Image[face][lvl];
 440                   if (texImg && texImg->Data) {
 441                      _mesa_free_texmemory(texImg->Data);
 442                      texImg->Data = NULL;
 443                   }
 444                }
 445             }
 446          }
 447       }
 448    }
 449 }
 450
 451
 452
 453 static void
 454 _swrast_sleep( GLcontext *ctx, GLbitfield new_state )
 455 {
 456    (void) ctx; (void) new_state;
 457 }
 458
 459
 460 static void
 461 _swrast_invalidate_state( GLcontext *ctx, GLbitfield new_state )
 462 {
 463    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 464    GLuint i;
 465
 466    swrast->NewState |= new_state;
 467
 468    /* After 10 statechanges without any swrast functions being called,
 469     * put the module to sleep.
 470     */
 471    if (++swrast->StateChanges > 10) {
 472       swrast->InvalidateState = _swrast_sleep;
 473       swrast->NewState = ~0;
 474       new_state = ~0;
 475    }
 476
 477    if (new_state & swrast->InvalidateTriangleMask)
 478       swrast->Triangle = _swrast_validate_triangle;
 479
 480    if (new_state & swrast->InvalidateLineMask)
 481       swrast->Line = _swrast_validate_line;
 482
 483    if (new_state & swrast->InvalidatePointMask)
 484       swrast->Point = _swrast_validate_point;
 485
 486    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 487       swrast->BlendFunc = _swrast_validate_blend_func;
 488
 489    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 490       for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 491          swrast->TextureSample[i] = NULL;
 492 }
 493
 494
 495 static void
 496 _swrast_update_texture_samplers(GLcontext *ctx)
 497 {
 498    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 499    GLuint u;
 500
 501    for (u = 0; u < ctx->Const.MaxTextureImageUnits; u++) {
 502       const struct gl_texture_object *tObj = ctx->Texture.Unit[u]._Current;
 503       if (tObj)
 504          swrast->TextureSample[u] =
 505             _swrast_choose_texture_sample_func(ctx, tObj);
 506    }
 507 }
 508
 509
 510 void
 511 _swrast_validate_derived( GLcontext *ctx )
 512 {
 513    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 514
 515    if (swrast->NewState) {
 516       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 517          _swrast_update_rasterflags( ctx );
 518
 519       if (swrast->NewState & _NEW_POLYGON)
 520          _swrast_update_polygon( ctx );
 521
 522       if (swrast->NewState & (_NEW_HINT | _NEW_PROGRAM))
 523          _swrast_update_fog_hint( ctx );
 524
 525       if (swrast->NewState & _SWRAST_NEW_TEXTURE_ENV_MODE)
 526          _swrast_update_texture_env( ctx );
 527
 528       if (swrast->NewState & (_NEW_FOG | _NEW_PROGRAM))
 529          _swrast_update_fog_state( ctx );
 530
 531       if (swrast->NewState & _NEW_PROGRAM)
 532          _swrast_update_fragment_program( ctx );
 533
 534       if (swrast->NewState & _NEW_TEXTURE)
 535          _swrast_update_texture_samplers( ctx );
 536
 537       if (swrast->NewState & (_NEW_TEXTURE | _NEW_PROGRAM))
 538          _swrast_validate_texture_images( ctx );
 539
 540       swrast->NewState = 0;
 541       swrast->StateChanges = 0;
 542       swrast->InvalidateState = _swrast_invalidate_state;
 543    }
 544 }
 545
 546 #define SWRAST_DEBUG 0
 547
 548 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 549  */
 550 void
 551 _swrast_Quad( GLcontext *ctx,
 552               const SWvertex *v0, const SWvertex *v1,
 553               const SWvertex *v2, const SWvertex *v3 )
 554 {
 555    if (SWRAST_DEBUG) {
 556       _mesa_debug(ctx, "_swrast_Quad\n");
 557       _swrast_print_vertex( ctx, v0 );
 558       _swrast_print_vertex( ctx, v1 );
 559       _swrast_print_vertex( ctx, v2 );
 560       _swrast_print_vertex( ctx, v3 );
 561    }
 562    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v3 );
 563    SWRAST_CONTEXT(ctx)->Triangle( ctx, v1, v2, v3 );
 564 }
 565
 566 void
 567 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 568                   const SWvertex *v1, const SWvertex *v2 )
 569 {
 570    if (SWRAST_DEBUG) {
 571       _mesa_debug(ctx, "_swrast_Triangle\n");
 572       _swrast_print_vertex( ctx, v0 );
 573       _swrast_print_vertex( ctx, v1 );
 574       _swrast_print_vertex( ctx, v2 );
 575    }
 576    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 577 }
 578
 579 void
 580 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 581 {
 582    if (SWRAST_DEBUG) {
 583       _mesa_debug(ctx, "_swrast_Line\n");
 584       _swrast_print_vertex( ctx, v0 );
 585       _swrast_print_vertex( ctx, v1 );
 586    }
 587    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 588 }
 589
 590 void
 591 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 592 {
 593    if (SWRAST_DEBUG) {
 594       _mesa_debug(ctx, "_swrast_Point\n");
 595       _swrast_print_vertex( ctx, v0 );
 596    }
 597    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 598 }
 599
 600 void
 601 _swrast_InvalidateState( GLcontext *ctx, GLbitfield new_state )
 602 {
 603    if (SWRAST_DEBUG) {
 604       _mesa_debug(ctx, "_swrast_InvalidateState\n");
 605    }
 606    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 607 }
 608
 609 void
 610 _swrast_ResetLineStipple( GLcontext *ctx )
 611 {
 612    if (SWRAST_DEBUG) {
 613       _mesa_debug(ctx, "_swrast_ResetLineStipple\n");
 614    }
 615    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 616 }
 617
 618 void
 619 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 620 {
 621    if (SWRAST_DEBUG) {
 622       _mesa_debug(ctx, "_swrast_allow_vertex_fog %d\n", value);
 623    }
 624    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 625    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 626 }
 627
 628 void
 629 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 630 {
 631    if (SWRAST_DEBUG) {
 632       _mesa_debug(ctx, "_swrast_allow_pixel_fog %d\n", value);
 633    }
 634    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 635    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 636 }
 637
 638
 639 GLboolean
 640 _swrast_CreateContext( GLcontext *ctx )
 641 {
 642    GLuint i;
 643    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 644
 645    if (SWRAST_DEBUG) {
 646       _mesa_debug(ctx, "_swrast_CreateContext\n");
 647    }
 648
 649    if (!swrast)
 650       return GL_FALSE;
 651
 652    swrast->NewState = ~0;
 653
 654    swrast->choose_point = _swrast_choose_point;
 655    swrast->choose_line = _swrast_choose_line;
 656    swrast->choose_triangle = _swrast_choose_triangle;
 657
 658    swrast->InvalidatePointMask = _SWRAST_NEW_POINT;
 659    swrast->InvalidateLineMask = _SWRAST_NEW_LINE;
 660    swrast->InvalidateTriangleMask = _SWRAST_NEW_TRIANGLE;
 661
 662    swrast->Point = _swrast_validate_point;
 663    swrast->Line = _swrast_validate_line;
 664    swrast->Triangle = _swrast_validate_triangle;
 665    swrast->InvalidateState = _swrast_sleep;
 666    swrast->BlendFunc = _swrast_validate_blend_func;
 667
 668    swrast->AllowVertexFog = GL_TRUE;
 669    swrast->AllowPixelFog = GL_TRUE;
 670
 671    /* Optimized Accum buffer */
 672    swrast->_IntegerAccumMode = GL_FALSE;
 673    swrast->_IntegerAccumScaler = 0.0;
 674
 675    for (i = 0; i < MAX_TEXTURE_IMAGE_UNITS; i++)
 676       swrast->TextureSample[i] = NULL;
 677
 678    swrast->SpanArrays = MALLOC_STRUCT(span_arrays);
 679    if (!swrast->SpanArrays) {
 680       FREE(swrast);
 681       return GL_FALSE;
 682    }
 683
 684    /* init point span buffer */
 685    swrast->PointSpan.primitive = GL_POINT;
 686    swrast->PointSpan.start = 0;
 687    swrast->PointSpan.end = 0;
 688    swrast->PointSpan.facing = 0;
 689    swrast->PointSpan.array = swrast->SpanArrays;
 690
 691    assert(ctx->Const.MaxTextureUnits > 0);
 692    assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_UNITS);
 693
 694    swrast->TexelBuffer = (GLchan *) MALLOC(ctx->Const.MaxTextureUnits *
 695                                            MAX_WIDTH * 4 * sizeof(GLchan));
 696    if (!swrast->TexelBuffer) {
 697       FREE(swrast->SpanArrays);
 698       FREE(swrast);
 699       return GL_FALSE;
 700    }
 701
 702    ctx->swrast_context = swrast;
 703
 704    return GL_TRUE;
 705 }
 706
 707 void
 708 _swrast_DestroyContext( GLcontext *ctx )
 709 {
 710    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 711
 712    if (SWRAST_DEBUG) {
 713       _mesa_debug(ctx, "_swrast_DestroyContext\n");
 714    }
 715
 716    FREE( swrast->SpanArrays );
 717    FREE( swrast->TexelBuffer );
 718    FREE( swrast );
 719
 720    ctx->swrast_context = 0;
 721 }
 722
 723
 724 struct swrast_device_driver *
 725 _swrast_GetDeviceDriverReference( GLcontext *ctx )
 726 {
 727    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 728    return &swrast->Driver;
 729 }
 730
 731 void
 732 _swrast_flush( GLcontext *ctx )
 733 {
 734    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 735    /* flush any pending fragments from rendering points */
 736    if (swrast->PointSpan.end > 0) {
 737       if (ctx->Visual.rgbMode) {
 738          _swrast_write_rgba_span(ctx, &(swrast->PointSpan));
 739       }
 740       else {
 741          _swrast_write_index_span(ctx, &(swrast->PointSpan));
 742       }
 743       swrast->PointSpan.end = 0;
 744    }
 745 }
 746
 747 void
 748 _swrast_render_primitive( GLcontext *ctx, GLenum prim )
 749 {
 750    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 751    if (swrast->Primitive == GL_POINTS && prim != GL_POINTS) {
 752       _swrast_flush(ctx);
 753    }
 754    swrast->Primitive = prim;
 755 }
 756
 757
 758 void
 759 _swrast_render_start( GLcontext *ctx )
 760 {
 761    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 762    if (swrast->Driver.SpanRenderStart)
 763       swrast->Driver.SpanRenderStart( ctx );
 764    swrast->PointSpan.end = 0;
 765 }
 766
 767 void
 768 _swrast_render_finish( GLcontext *ctx )
 769 {
 770    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 771    if (swrast->Driver.SpanRenderFinish)
 772       swrast->Driver.SpanRenderFinish( ctx );
 773
 774    _swrast_flush(ctx);
 775 }
 776
 777
 778 #define SWRAST_DEBUG_VERTICES 0
 779
 780 void
 781 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 782 {
 783    GLuint i;
 784
 785    if (SWRAST_DEBUG_VERTICES) {
 786       _mesa_debug(ctx, "win %f %f %f %f\n",
 787                   v->win[0], v->win[1], v->win[2], v->win[3]);
 788
 789       for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 790          if (ctx->Texture.Unit[i]._ReallyEnabled)
 791             _mesa_debug(ctx, "texcoord[%d] %f %f %f %f\n", i,
 792                         v->texcoord[i][0], v->texcoord[i][1],
 793                         v->texcoord[i][2], v->texcoord[i][3]);
 794
 795 #if CHAN_TYPE == GL_FLOAT
 796       _mesa_debug(ctx, "color %f %f %f %f\n",
 797                   v->color[0], v->color[1], v->color[2], v->color[3]);
 798       _mesa_debug(ctx, "spec %f %f %f %f\n",
 799                   v->specular[0], v->specular[1],
 800                   v->specular[2], v->specular[3]);
 801 #else
 802       _mesa_debug(ctx, "color %d %d %d %d\n",
 803                   v->color[0], v->color[1], v->color[2], v->color[3]);
 804       _mesa_debug(ctx, "spec %d %d %d %d\n",
 805                   v->specular[0], v->specular[1],
 806                   v->specular[2], v->specular[3]);
 807 #endif
 808       _mesa_debug(ctx, "fog %f\n", v->fog);
 809       _mesa_debug(ctx, "index %d\n", v->index);
 810       _mesa_debug(ctx, "pointsize %f\n", v->pointSize);
 811       _mesa_debug(ctx, "\n");
 812    }
 813 }