src/mesa/swrast/s_context.c

   1 /* $Id: s_context.c,v 1.14 2001/02/16 18:56:46 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Authors:
  27  *    Keith Whitwell <keithw@valinux.com>
  28  */
  29
  30 #include "glheader.h"
  31 #include "mtypes.h"
  32 #include "mem.h"
  33
  34 #include "s_pb.h"
  35 #include "s_points.h"
  36 #include "s_lines.h"
  37 #include "s_triangle.h"
  38 #include "s_blend.h"
  39 #include "s_context.h"
  40 #include "s_texture.h"
  41
  42
  43
  44
  45
  46 /*
  47  * Recompute the value of swrast->_RasterMask, etc. according to
  48  * the current context.
  49  */
  50 static void
  51 _swrast_update_rasterflags( GLcontext *ctx )
  52 {
  53    GLuint RasterMask = 0;
  54
  55    if (ctx->Color.AlphaEnabled)           RasterMask |= ALPHATEST_BIT;
  56    if (ctx->Color.BlendEnabled)           RasterMask |= BLEND_BIT;
  57    if (ctx->Depth.Test)                   RasterMask |= DEPTH_BIT;
  58    if (ctx->Fog.Enabled)                  RasterMask |= FOG_BIT;
  59    if (ctx->Scissor.Enabled)              RasterMask |= SCISSOR_BIT;
  60    if (ctx->Stencil.Enabled)              RasterMask |= STENCIL_BIT;
  61    if (ctx->Visual.rgbMode) {
  62       const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
  63       if (colorMask != 0xffffffff)        RasterMask |= MASKING_BIT;
  64       if (ctx->Color.ColorLogicOpEnabled) RasterMask |= LOGIC_OP_BIT;
  65       if (ctx->Texture._ReallyEnabled)     RasterMask |= TEXTURE_BIT;
  66    }
  67    else {
  68       if (ctx->Color.IndexMask != 0xffffffff) RasterMask |= MASKING_BIT;
  69       if (ctx->Color.IndexLogicOpEnabled)     RasterMask |= LOGIC_OP_BIT;
  70    }
  71
  72    if (ctx->DrawBuffer->UseSoftwareAlphaBuffers
  73        && ctx->Color.ColorMask[ACOMP]
  74        && ctx->Color.DrawBuffer != GL_NONE)
  75       RasterMask |= ALPHABUF_BIT;
  76
  77    if (   ctx->Viewport.X < 0
  78        || ctx->Viewport.X + ctx->Viewport.Width > ctx->DrawBuffer->Width
  79        || ctx->Viewport.Y < 0
  80        || ctx->Viewport.Y + ctx->Viewport.Height > ctx->DrawBuffer->Height) {
  81       RasterMask |= WINCLIP_BIT;
  82    }
  83
  84    if (ctx->Depth.OcclusionTest)
  85       RasterMask |= OCCLUSION_BIT;
  86
  87
  88    /* If we're not drawing to exactly one color buffer set the
  89     * MULTI_DRAW_BIT flag.  Also set it if we're drawing to no
  90     * buffers or the RGBA or CI mask disables all writes.
  91     */
  92    if (ctx->Color.MultiDrawBuffer) {
  93       RasterMask |= MULTI_DRAW_BIT;
  94    }
  95    else if (ctx->Color.DrawBuffer==GL_NONE) {
  96       RasterMask |= MULTI_DRAW_BIT;
  97    }
  98    else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
  99       RasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 100    }
 101    else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
 102       RasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
 103    }
 104
 105    if (   ctx->Viewport.X<0
 106        || ctx->Viewport.X + ctx->Viewport.Width > ctx->DrawBuffer->Width
 107        || ctx->Viewport.Y<0
 108        || ctx->Viewport.Y + ctx->Viewport.Height > ctx->DrawBuffer->Height) {
 109       RasterMask |= WINCLIP_BIT;
 110    }
 111
 112    SWRAST_CONTEXT(ctx)->_RasterMask = RasterMask;
 113 }
 114
 115
 116 static void
 117 _swrast_update_polygon( GLcontext *ctx )
 118 {
 119    GLfloat backface_sign = 1;
 120
 121    if (ctx->Polygon.CullFlag) {
 122       backface_sign = 1;
 123       switch(ctx->Polygon.CullFaceMode) {
 124       case GL_BACK:
 125          if(ctx->Polygon.FrontFace==GL_CCW)
 126             backface_sign = -1;
 127          break;
 128       case GL_FRONT:
 129          if(ctx->Polygon.FrontFace!=GL_CCW)
 130             backface_sign = -1;
 131          break;
 132       default:
 133       case GL_FRONT_AND_BACK:
 134          backface_sign = 0;
 135          break;
 136       }
 137    }
 138    else {
 139       backface_sign = 0;
 140    }
 141
 142    SWRAST_CONTEXT(ctx)->_backface_sign = backface_sign;
 143 }
 144
 145
 146 static void
 147 _swrast_update_hint( GLcontext *ctx )
 148 {
 149    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 150    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 151                               (ctx->Hint.Fog == GL_NICEST &&
 152                                swrast->AllowPixelFog));
 153 }
 154
 155 #define _SWRAST_NEW_DERIVED (_SWRAST_NEW_RASTERMASK |   \
 156                              _NEW_TEXTURE |             \
 157                              _NEW_HINT |                \
 158                              _NEW_POLYGON )
 159
 160 /* State referenced by _swrast_choose_triangle, _swrast_choose_line.
 161  */
 162 #define _SWRAST_NEW_TRIANGLE (_SWRAST_NEW_DERIVED |             \
 163                               _NEW_RENDERMODE|                  \
 164                               _NEW_POLYGON|                     \
 165                               _NEW_DEPTH|                       \
 166                               _NEW_STENCIL|                     \
 167                               _NEW_COLOR|                       \
 168                               _NEW_TEXTURE|                     \
 169                               _SWRAST_NEW_RASTERMASK|           \
 170                               _NEW_LIGHT|                       \
 171                               _NEW_FOG |                        \
 172                               _DD_NEW_SEPERATE_SPECULAR)
 173
 174 #define _SWRAST_NEW_LINE (_SWRAST_NEW_DERIVED |         \
 175                           _NEW_RENDERMODE|              \
 176                           _NEW_LINE|                    \
 177                           _NEW_TEXTURE|                 \
 178                           _NEW_LIGHT|                   \
 179                           _NEW_FOG|                     \
 180                           _NEW_DEPTH |                  \
 181                           _DD_NEW_SEPERATE_SPECULAR)
 182
 183 #define _SWRAST_NEW_POINT (_SWRAST_NEW_DERIVED |        \
 184                            _NEW_RENDERMODE |            \
 185                            _NEW_POINT |                 \
 186                            _NEW_TEXTURE |               \
 187                            _NEW_LIGHT |                 \
 188                            _NEW_FOG |                   \
 189                            _DD_NEW_SEPERATE_SPECULAR)
 190
 191 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 192
 193 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 194
 195
 196
 197 /* Stub for swrast->Triangle to select a true triangle function
 198  * after a state change.
 199  */
 200 static void
 201 _swrast_validate_triangle( GLcontext *ctx,
 202                            const SWvertex *v0,
 203                            const SWvertex *v1,
 204                            const SWvertex *v2 )
 205 {
 206    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 207
 208    _swrast_validate_derived( ctx );
 209    swrast->choose_triangle( ctx );
 210
 211    if ((ctx->_TriangleCaps & DD_SEPERATE_SPECULAR) &&
 212        !ctx->Texture._ReallyEnabled) {
 213       swrast->SpecTriangle = swrast->Triangle;
 214       swrast->Triangle = _swrast_add_spec_terms_triangle;
 215    }
 216
 217    swrast->Triangle( ctx, v0, v1, v2 );
 218 }
 219
 220 static void
 221 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 222 {
 223    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 224
 225    _swrast_validate_derived( ctx );
 226    swrast->choose_line( ctx );
 227
 228    if ((ctx->_TriangleCaps & DD_SEPERATE_SPECULAR) &&
 229        !ctx->Texture._ReallyEnabled) {
 230       swrast->SpecLine = swrast->Line;
 231       swrast->Line = _swrast_add_spec_terms_line;
 232    }
 233
 234
 235    swrast->Line( ctx, v0, v1 );
 236 }
 237
 238 static void
 239 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 240 {
 241    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 242
 243    _swrast_validate_derived( ctx );
 244    swrast->choose_point( ctx );
 245
 246    if ((ctx->_TriangleCaps & DD_SEPERATE_SPECULAR) &&
 247        !ctx->Texture._ReallyEnabled) {
 248       swrast->SpecPoint = swrast->Point;
 249       swrast->Point = _swrast_add_spec_terms_point;
 250    }
 251
 252    swrast->Point( ctx, v0 );
 253 }
 254
 255 static void
 256 _swrast_validate_blend_func( GLcontext *ctx, GLuint n,
 257                              const GLubyte mask[],
 258                              GLchan src[][4],
 259                              CONST GLchan dst[][4] )
 260 {
 261    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 262
 263    _swrast_validate_derived( ctx );
 264    _swrast_choose_blend_func( ctx );
 265
 266    swrast->BlendFunc( ctx, n, mask, src, dst );
 267 }
 268
 269
 270 static void
 271 _swrast_validate_texture_sample( GLcontext *ctx, GLuint texUnit,
 272                                  const struct gl_texture_object *tObj,
 273                                  GLuint n,
 274                                  const GLfloat s[], const GLfloat t[],
 275                                  const GLfloat u[], const GLfloat lambda[],
 276                                  GLchan rgba[][4] )
 277 {
 278    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 279
 280    _swrast_validate_derived( ctx );
 281    _swrast_choose_texture_sample_func( ctx, texUnit, tObj );
 282
 283    swrast->TextureSample[texUnit]( ctx, texUnit, tObj, n, s, t, u,
 284                                    lambda, rgba );
 285 }
 286
 287
 288 static void
 289 _swrast_sleep( GLcontext *ctx, GLuint new_state )
 290 {
 291 }
 292
 293
 294 static void
 295 _swrast_invalidate_state( GLcontext *ctx, GLuint new_state )
 296 {
 297    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 298    GLuint i;
 299
 300    swrast->NewState |= new_state;
 301
 302    /* After 10 statechanges without any swrast functions being called,
 303     * put the module to sleep.
 304     */
 305    if (++swrast->StateChanges > 10) {
 306       swrast->InvalidateState = _swrast_sleep;
 307       swrast->NewState = ~0;
 308       new_state = ~0;
 309    }
 310
 311    if (new_state & swrast->invalidate_triangle)
 312       swrast->Triangle = _swrast_validate_triangle;
 313
 314    if (new_state & swrast->invalidate_line)
 315       swrast->Line = _swrast_validate_line;
 316
 317    if (new_state & swrast->invalidate_point)
 318       swrast->Point = _swrast_validate_point;
 319
 320    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 321       swrast->BlendFunc = _swrast_validate_blend_func;
 322
 323    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 324       for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 325          swrast->TextureSample[i] = _swrast_validate_texture_sample;
 326 }
 327
 328
 329
 330 void
 331 _swrast_validate_derived( GLcontext *ctx )
 332 {
 333    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 334
 335    if (swrast->NewState)
 336    {
 337       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 338          _swrast_update_rasterflags( ctx );
 339
 340       if (swrast->NewState & _NEW_TEXTURE)
 341          swrast->_MultiTextureEnabled =
 342             ctx->Texture._ReallyEnabled > TEXTURE0_ANY;
 343
 344       if (swrast->NewState & _NEW_POLYGON)
 345          _swrast_update_polygon( ctx );
 346
 347       if (swrast->NewState & _NEW_HINT)
 348          _swrast_update_hint( ctx );
 349
 350       swrast->NewState = 0;
 351       swrast->StateChanges = 0;
 352       swrast->InvalidateState = _swrast_invalidate_state;
 353    }
 354 }
 355
 356
 357
 358 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 359  */
 360 void
 361 _swrast_Quad( GLcontext *ctx,
 362               const SWvertex *v0, const SWvertex *v1,
 363               const SWvertex *v2, const SWvertex *v3 )
 364 {
 365    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 366    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v2, v3 );
 367 }
 368
 369 void
 370 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 371                   const SWvertex *v1, const SWvertex *v2 )
 372 {
 373 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 374 /*     _swrast_print_vertex( ctx, v0 ); */
 375 /*     _swrast_print_vertex( ctx, v1 ); */
 376 /*     _swrast_print_vertex( ctx, v2 ); */
 377    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 378 }
 379
 380 void
 381 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 382 {
 383 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 384 /*     _swrast_print_vertex( ctx, v0 ); */
 385 /*     _swrast_print_vertex( ctx, v1 ); */
 386    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 387 }
 388
 389 void
 390 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 391 {
 392 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 393 /*     _swrast_print_vertex( ctx, v0 ); */
 394    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 395 }
 396
 397 void
 398 _swrast_InvalidateState( GLcontext *ctx, GLuint new_state )
 399 {
 400    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 401 }
 402
 403 void
 404 _swrast_ResetLineStipple( GLcontext *ctx )
 405 {
 406    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 407 }
 408
 409 void
 410 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 411 {
 412    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 413    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 414 }
 415
 416 void
 417 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 418 {
 419    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 420    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 421 }
 422
 423
 424 GLboolean
 425 _swrast_CreateContext( GLcontext *ctx )
 426 {
 427    GLuint i;
 428    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 429    if (!swrast)
 430       return GL_FALSE;
 431
 432    swrast->PB = gl_alloc_pb();
 433    if (!swrast->PB) {
 434       FREE(swrast);
 435       return GL_FALSE;
 436    }
 437
 438    swrast->NewState = ~0;
 439
 440    swrast->choose_point = _swrast_choose_point;
 441    swrast->choose_line = _swrast_choose_line;
 442    swrast->choose_triangle = _swrast_choose_triangle;
 443
 444    swrast->invalidate_point = _SWRAST_NEW_POINT;
 445    swrast->invalidate_line = _SWRAST_NEW_LINE;
 446    swrast->invalidate_triangle = _SWRAST_NEW_TRIANGLE;
 447
 448    swrast->Point = _swrast_validate_point;
 449    swrast->Line = _swrast_validate_line;
 450    swrast->Triangle = _swrast_validate_triangle;
 451    swrast->InvalidateState = _swrast_sleep;
 452    swrast->BlendFunc = _swrast_validate_blend_func;
 453
 454    swrast->AllowVertexFog = GL_TRUE;
 455    swrast->AllowPixelFog = GL_TRUE;
 456
 457    /* Optimized Accum buffer */
 458    swrast->_IntegerAccumMode = GL_TRUE;
 459    swrast->_IntegerAccumScaler = 0.0;
 460
 461
 462    for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++)
 463       swrast->TextureSample[i] = _swrast_validate_texture_sample;
 464
 465    ctx->swrast_context = swrast;
 466    return GL_TRUE;
 467 }
 468
 469 void
 470 _swrast_DestroyContext( GLcontext *ctx )
 471 {
 472    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 473
 474    FREE( swrast->PB );
 475    FREE( swrast );
 476
 477    ctx->swrast_context = 0;
 478 }
 479
 480
 481 void
 482 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 483 {
 484    GLuint i;
 485
 486    fprintf(stderr, "win %f %f %f %f\n",
 487            v->win[0], v->win[1], v->win[2], v->win[3]);
 488
 489    for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 490       fprintf(stderr, "texcoord[%d] %f %f %f %f\n", i,
 491               v->texcoord[i][0], v->texcoord[i][1],
 492               v->texcoord[i][2], v->texcoord[i][3]);
 493
 494    fprintf(stderr, "color %d %d %d %d\n",
 495            v->color[0], v->color[1], v->color[2], v->color[3]);
 496    fprintf(stderr, "spec %d %d %d %d\n",
 497            v->specular[0], v->specular[1], v->specular[2], v->specular[3]);
 498    fprintf(stderr, "fog %f\n", v->fog);
 499    fprintf(stderr, "index %d\n", v->index);
 500    fprintf(stderr, "pointsize %f\n", v->pointSize);
 501    fprintf(stderr, "\n");
 502 }