src/mesa/swrast/s_context.c

   1 /* $Id: s_context.c,v 1.13 2001/02/16 18:14:41 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_TRIANGLE (_NEW_RENDERMODE|                  \
 156                               _NEW_POLYGON|                     \
 157                               _NEW_DEPTH|                       \
 158                               _NEW_STENCIL|                     \
 159                               _NEW_COLOR|                       \
 160                               _NEW_TEXTURE|                     \
 161                               _NEW_HINT|                        \
 162                               _SWRAST_NEW_RASTERMASK|           \
 163                               _NEW_LIGHT|                       \
 164                               _NEW_FOG |                        \
 165                               _DD_NEW_SEPERATE_SPECULAR)
 166
 167 #define _SWRAST_NEW_LINE (_NEW_RENDERMODE|              \
 168                           _NEW_LINE|                    \
 169                           _NEW_TEXTURE|                 \
 170                           _NEW_LIGHT|                   \
 171                           _NEW_FOG|                     \
 172                           _NEW_DEPTH |                  \
 173                           _DD_NEW_SEPERATE_SPECULAR)
 174
 175 #define _SWRAST_NEW_POINT (_NEW_RENDERMODE |            \
 176                            _NEW_POINT |                 \
 177                            _NEW_TEXTURE |               \
 178                            _NEW_LIGHT |                 \
 179                            _NEW_FOG |                   \
 180                            _DD_NEW_SEPERATE_SPECULAR)
 181
 182 #define _SWRAST_NEW_TEXTURE_SAMPLE_FUNC _NEW_TEXTURE
 183
 184 #define _SWRAST_NEW_BLEND_FUNC _NEW_COLOR
 185
 186
 187
 188 /* Stub for swrast->Triangle to select a true triangle function
 189  * after a state change.
 190  */
 191 static void
 192 _swrast_validate_triangle( GLcontext *ctx,
 193                            const SWvertex *v0,
 194                            const SWvertex *v1,
 195                            const SWvertex *v2 )
 196 {
 197    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 198
 199    _swrast_validate_derived( ctx );
 200    swrast->choose_triangle( ctx );
 201
 202    if ((ctx->_TriangleCaps & DD_SEPERATE_SPECULAR) &&
 203        !ctx->Texture._ReallyEnabled) {
 204       swrast->SpecTriangle = swrast->Triangle;
 205       swrast->Triangle = _swrast_add_spec_terms_triangle;
 206    }
 207
 208    swrast->Triangle( ctx, v0, v1, v2 );
 209 }
 210
 211 static void
 212 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 213 {
 214    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 215
 216    _swrast_validate_derived( ctx );
 217    swrast->choose_line( ctx );
 218
 219    if ((ctx->_TriangleCaps & DD_SEPERATE_SPECULAR) &&
 220        !ctx->Texture._ReallyEnabled) {
 221       swrast->SpecLine = swrast->Line;
 222       swrast->Line = _swrast_add_spec_terms_line;
 223    }
 224
 225
 226    swrast->Line( ctx, v0, v1 );
 227 }
 228
 229 static void
 230 _swrast_validate_point( GLcontext *ctx, const SWvertex *v0 )
 231 {
 232    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 233
 234    _swrast_validate_derived( ctx );
 235    swrast->choose_point( ctx );
 236
 237    if ((ctx->_TriangleCaps & DD_SEPERATE_SPECULAR) &&
 238        !ctx->Texture._ReallyEnabled) {
 239       swrast->SpecPoint = swrast->Point;
 240       swrast->Point = _swrast_add_spec_terms_point;
 241    }
 242
 243    swrast->Point( ctx, v0 );
 244 }
 245
 246 static void
 247 _swrast_validate_blend_func( GLcontext *ctx, GLuint n,
 248                              const GLubyte mask[],
 249                              GLchan src[][4],
 250                              CONST GLchan dst[][4] )
 251 {
 252    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 253
 254    _swrast_validate_derived( ctx );
 255    _swrast_choose_blend_func( ctx );
 256
 257    swrast->BlendFunc( ctx, n, mask, src, dst );
 258 }
 259
 260
 261 static void
 262 _swrast_validate_texture_sample( GLcontext *ctx, GLuint texUnit,
 263                                  const struct gl_texture_object *tObj,
 264                                  GLuint n,
 265                                  const GLfloat s[], const GLfloat t[],
 266                                  const GLfloat u[], const GLfloat lambda[],
 267                                  GLchan rgba[][4] )
 268 {
 269    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 270
 271    _swrast_validate_derived( ctx );
 272    _swrast_choose_texture_sample_func( ctx, texUnit, tObj );
 273
 274    swrast->TextureSample[texUnit]( ctx, texUnit, tObj, n, s, t, u,
 275                                    lambda, rgba );
 276 }
 277
 278
 279 static void
 280 _swrast_sleep( GLcontext *ctx, GLuint new_state )
 281 {
 282 }
 283
 284
 285 static void
 286 _swrast_invalidate_state( GLcontext *ctx, GLuint new_state )
 287 {
 288    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 289    GLuint i;
 290
 291    swrast->NewState |= new_state;
 292
 293    /* After 10 statechanges without any swrast functions being called,
 294     * put the module to sleep.
 295     */
 296    if (++swrast->StateChanges > 10) {
 297       swrast->InvalidateState = _swrast_sleep;
 298       swrast->NewState = ~0;
 299       new_state = ~0;
 300    }
 301
 302    if (new_state & swrast->invalidate_triangle)
 303       swrast->Triangle = _swrast_validate_triangle;
 304
 305    if (new_state & swrast->invalidate_line)
 306       swrast->Line = _swrast_validate_line;
 307
 308    if (new_state & swrast->invalidate_point)
 309       swrast->Point = _swrast_validate_point;
 310
 311    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 312       swrast->BlendFunc = _swrast_validate_blend_func;
 313
 314    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 315       for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 316          swrast->TextureSample[i] = _swrast_validate_texture_sample;
 317 }
 318
 319
 320
 321 void
 322 _swrast_validate_derived( GLcontext *ctx )
 323 {
 324    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 325
 326    if (swrast->NewState)
 327    {
 328       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 329          _swrast_update_rasterflags( ctx );
 330
 331       if (swrast->NewState & _NEW_TEXTURE)
 332          swrast->_MultiTextureEnabled =
 333             ctx->Texture._ReallyEnabled > TEXTURE0_ANY;
 334
 335       if (swrast->NewState & _NEW_POLYGON)
 336          _swrast_update_polygon( ctx );
 337
 338       if (swrast->NewState & _NEW_HINT)
 339          _swrast_update_hint( ctx );
 340
 341       swrast->NewState = 0;
 342       swrast->StateChanges = 0;
 343       swrast->InvalidateState = _swrast_invalidate_state;
 344    }
 345 }
 346
 347
 348
 349 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 350  */
 351 void
 352 _swrast_Quad( GLcontext *ctx,
 353               const SWvertex *v0, const SWvertex *v1,
 354               const SWvertex *v2, const SWvertex *v3 )
 355 {
 356    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 357    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v2, v3 );
 358 }
 359
 360 void
 361 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 362                   const SWvertex *v1, const SWvertex *v2 )
 363 {
 364 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 365 /*     _swrast_print_vertex( ctx, v0 ); */
 366 /*     _swrast_print_vertex( ctx, v1 ); */
 367 /*     _swrast_print_vertex( ctx, v2 ); */
 368    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 369 }
 370
 371 void
 372 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 373 {
 374 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 375 /*     _swrast_print_vertex( ctx, v0 ); */
 376 /*     _swrast_print_vertex( ctx, v1 ); */
 377    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 378 }
 379
 380 void
 381 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 382 {
 383 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 384 /*     _swrast_print_vertex( ctx, v0 ); */
 385    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 386 }
 387
 388 void
 389 _swrast_InvalidateState( GLcontext *ctx, GLuint new_state )
 390 {
 391    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 392 }
 393
 394 void
 395 _swrast_ResetLineStipple( GLcontext *ctx )
 396 {
 397    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 398 }
 399
 400 void
 401 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 402 {
 403    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 404    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 405 }
 406
 407 void
 408 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 409 {
 410    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 411    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 412 }
 413
 414
 415 GLboolean
 416 _swrast_CreateContext( GLcontext *ctx )
 417 {
 418    GLuint i;
 419    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 420    if (!swrast)
 421       return GL_FALSE;
 422
 423    swrast->PB = gl_alloc_pb();
 424    if (!swrast->PB) {
 425       FREE(swrast);
 426       return GL_FALSE;
 427    }
 428
 429    swrast->NewState = ~0;
 430
 431    swrast->choose_point = _swrast_choose_point;
 432    swrast->choose_line = _swrast_choose_line;
 433    swrast->choose_triangle = _swrast_choose_triangle;
 434
 435    swrast->invalidate_point = _SWRAST_NEW_POINT;
 436    swrast->invalidate_line = _SWRAST_NEW_LINE;
 437    swrast->invalidate_triangle = _SWRAST_NEW_TRIANGLE;
 438
 439    swrast->Point = _swrast_validate_point;
 440    swrast->Line = _swrast_validate_line;
 441    swrast->Triangle = _swrast_validate_triangle;
 442    swrast->InvalidateState = _swrast_sleep;
 443    swrast->BlendFunc = _swrast_validate_blend_func;
 444
 445    swrast->AllowVertexFog = GL_TRUE;
 446    swrast->AllowPixelFog = GL_TRUE;
 447
 448    /* Optimized Accum buffer */
 449    swrast->_IntegerAccumMode = GL_TRUE;
 450    swrast->_IntegerAccumScaler = 0.0;
 451
 452
 453    for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++)
 454       swrast->TextureSample[i] = _swrast_validate_texture_sample;
 455
 456    ctx->swrast_context = swrast;
 457    return GL_TRUE;
 458 }
 459
 460 void
 461 _swrast_DestroyContext( GLcontext *ctx )
 462 {
 463    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 464
 465    FREE( swrast->PB );
 466    FREE( swrast );
 467
 468    ctx->swrast_context = 0;
 469 }
 470
 471
 472 void
 473 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 474 {
 475    GLuint i;
 476
 477    fprintf(stderr, "win %f %f %f %f\n",
 478            v->win[0], v->win[1], v->win[2], v->win[3]);
 479
 480    for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 481       fprintf(stderr, "texcoord[%d] %f %f %f %f\n", i,
 482               v->texcoord[i][0], v->texcoord[i][1],
 483               v->texcoord[i][2], v->texcoord[i][3]);
 484
 485    fprintf(stderr, "color %d %d %d %d\n",
 486            v->color[0], v->color[1], v->color[2], v->color[3]);
 487    fprintf(stderr, "spec %d %d %d %d\n",
 488            v->specular[0], v->specular[1], v->specular[2], v->specular[3]);
 489    fprintf(stderr, "fog %f\n", v->fog);
 490    fprintf(stderr, "index %d\n", v->index);
 491    fprintf(stderr, "pointsize %f\n", v->pointSize);
 492    fprintf(stderr, "\n");
 493 }