src/mesa/swrast/s_context.c

   1 /* $Id: s_context.c,v 1.12 2001/01/29 21:47:13 brianp 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_quads.h"
  39 #include "s_blend.h"
  40 #include "s_context.h"
  41 #include "s_texture.h"
  42
  43
  44
  45
  46
  47 /*
  48  * Recompute the value of swrast->_RasterMask, etc. according to
  49  * the current context.
  50  */
  51 static void
  52 _swrast_update_rasterflags( GLcontext *ctx )
  53 {
  54    GLuint RasterMask = 0;
  55
  56    if (ctx->Color.AlphaEnabled)           RasterMask |= ALPHATEST_BIT;
  57    if (ctx->Color.BlendEnabled)           RasterMask |= BLEND_BIT;
  58    if (ctx->Depth.Test)                   RasterMask |= DEPTH_BIT;
  59    if (ctx->Fog.Enabled)                  RasterMask |= FOG_BIT;
  60    if (ctx->Scissor.Enabled)              RasterMask |= SCISSOR_BIT;
  61    if (ctx->Stencil.Enabled)              RasterMask |= STENCIL_BIT;
  62    if (ctx->Visual.rgbMode) {
  63       const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
  64       if (colorMask != 0xffffffff)        RasterMask |= MASKING_BIT;
  65       if (ctx->Color.ColorLogicOpEnabled) RasterMask |= LOGIC_OP_BIT;
  66       if (ctx->Texture._ReallyEnabled)     RasterMask |= TEXTURE_BIT;
  67    }
  68    else {
  69       if (ctx->Color.IndexMask != 0xffffffff) RasterMask |= MASKING_BIT;
  70       if (ctx->Color.IndexLogicOpEnabled)     RasterMask |= LOGIC_OP_BIT;
  71    }
  72
  73    if (ctx->DrawBuffer->UseSoftwareAlphaBuffers
  74        && ctx->Color.ColorMask[ACOMP]
  75        && ctx->Color.DrawBuffer != GL_NONE)
  76       RasterMask |= ALPHABUF_BIT;
  77
  78    if (   ctx->Viewport.X < 0
  79        || ctx->Viewport.X + ctx->Viewport.Width > ctx->DrawBuffer->Width
  80        || ctx->Viewport.Y < 0
  81        || ctx->Viewport.Y + ctx->Viewport.Height > ctx->DrawBuffer->Height) {
  82       RasterMask |= WINCLIP_BIT;
  83    }
  84
  85    if (ctx->Depth.OcclusionTest)
  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->Color.MultiDrawBuffer) {
  94       RasterMask |= MULTI_DRAW_BIT;
  95    }
  96    else if (ctx->Color.DrawBuffer==GL_NONE) {
  97       RasterMask |= MULTI_DRAW_BIT;
  98    }
  99    else if (ctx->Visual.rgbMode && *((GLuint *) ctx->Color.ColorMask) == 0) {
 100       RasterMask |= MULTI_DRAW_BIT; /* all RGBA channels disabled */
 101    }
 102    else if (!ctx->Visual.rgbMode && ctx->Color.IndexMask==0) {
 103       RasterMask |= MULTI_DRAW_BIT; /* all color index bits disabled */
 104    }
 105
 106    if (   ctx->Viewport.X<0
 107        || ctx->Viewport.X + ctx->Viewport.Width > ctx->DrawBuffer->Width
 108        || ctx->Viewport.Y<0
 109        || ctx->Viewport.Y + ctx->Viewport.Height > ctx->DrawBuffer->Height) {
 110       RasterMask |= WINCLIP_BIT;
 111    }
 112
 113    SWRAST_CONTEXT(ctx)->_RasterMask = RasterMask;
 114 }
 115
 116
 117 static void
 118 _swrast_update_polygon( GLcontext *ctx )
 119 {
 120    GLfloat backface_sign = 1;
 121
 122    if (ctx->Polygon.CullFlag) {
 123       backface_sign = 1;
 124       switch(ctx->Polygon.CullFaceMode) {
 125       case GL_BACK:
 126          if(ctx->Polygon.FrontFace==GL_CCW)
 127             backface_sign = -1;
 128          break;
 129       case GL_FRONT:
 130          if(ctx->Polygon.FrontFace!=GL_CCW)
 131             backface_sign = -1;
 132          break;
 133       default:
 134       case GL_FRONT_AND_BACK:
 135          backface_sign = 0;
 136          break;
 137       }
 138    }
 139    else {
 140       backface_sign = 0;
 141    }
 142
 143    SWRAST_CONTEXT(ctx)->_backface_sign = backface_sign;
 144 }
 145
 146
 147 static void
 148 _swrast_update_hint( GLcontext *ctx )
 149 {
 150    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 151    swrast->_PreferPixelFog = (!swrast->AllowVertexFog ||
 152                               (ctx->Hint.Fog == GL_NICEST &&
 153                                swrast->AllowPixelFog));
 154 }
 155
 156 #define _SWRAST_NEW_TRIANGLE (_NEW_RENDERMODE|          \
 157                               _NEW_POLYGON|             \
 158                               _NEW_DEPTH|               \
 159                               _NEW_STENCIL|             \
 160                               _NEW_COLOR|               \
 161                               _NEW_TEXTURE|             \
 162                               _NEW_HINT|                \
 163                               _SWRAST_NEW_RASTERMASK|   \
 164                               _NEW_LIGHT|               \
 165                               _NEW_FOG)
 166
 167 #define _SWRAST_NEW_LINE (_NEW_RENDERMODE|      \
 168                           _NEW_LINE|            \
 169                           _NEW_TEXTURE|         \
 170                           _NEW_LIGHT|           \
 171                           _NEW_FOG|             \
 172                           _NEW_DEPTH)
 173
 174 #define _SWRAST_NEW_POINT (_NEW_RENDERMODE |    \
 175                            _NEW_POINT |         \
 176                            _NEW_TEXTURE |       \
 177                            _NEW_LIGHT |         \
 178                            _NEW_FOG)
 179
 180 #define _SWRAST_NEW_QUAD  0
 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_quad( GLcontext *ctx,
 193                        const SWvertex *v0, const SWvertex *v1,
 194                        const SWvertex *v2, const SWvertex *v3 )
 195 {
 196    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 197
 198    _swrast_validate_derived( ctx );
 199    swrast->choose_quad( ctx );
 200
 201    swrast->Quad( ctx, v0, v1, v2, v3 );
 202 }
 203
 204 static void
 205 _swrast_validate_triangle( GLcontext *ctx,
 206                            const SWvertex *v0,
 207                            const SWvertex *v1,
 208                            const SWvertex *v2 )
 209 {
 210    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 211
 212    _swrast_validate_derived( ctx );
 213    swrast->choose_triangle( ctx );
 214
 215    swrast->Triangle( ctx, v0, v1, v2 );
 216 }
 217
 218 static void
 219 _swrast_validate_line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 220 {
 221    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 222
 223    _swrast_validate_derived( ctx );
 224    swrast->choose_line( ctx );
 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    swrast->Point( ctx, v0 );
 238 }
 239
 240 static void
 241 _swrast_validate_blend_func( GLcontext *ctx, GLuint n,
 242                              const GLubyte mask[],
 243                              GLchan src[][4],
 244                              CONST GLchan dst[][4] )
 245 {
 246    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 247
 248    _swrast_validate_derived( ctx );
 249    _swrast_choose_blend_func( ctx );
 250
 251    swrast->BlendFunc( ctx, n, mask, src, dst );
 252 }
 253
 254
 255 static void
 256 _swrast_validate_texture_sample( GLcontext *ctx, GLuint texUnit,
 257                                  const struct gl_texture_object *tObj,
 258                                  GLuint n,
 259                                  const GLfloat s[], const GLfloat t[],
 260                                  const GLfloat u[], const GLfloat lambda[],
 261                                  GLchan rgba[][4] )
 262 {
 263    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 264
 265    _swrast_validate_derived( ctx );
 266    _swrast_choose_texture_sample_func( ctx, texUnit, tObj );
 267
 268    swrast->TextureSample[texUnit]( ctx, texUnit, tObj, n, s, t, u,
 269                                    lambda, rgba );
 270 }
 271
 272
 273 static void
 274 _swrast_sleep( GLcontext *ctx, GLuint new_state )
 275 {
 276 }
 277
 278
 279 static void
 280 _swrast_invalidate_state( GLcontext *ctx, GLuint new_state )
 281 {
 282    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 283    GLuint i;
 284
 285    swrast->NewState |= new_state;
 286
 287    /* After 10 statechanges without any swrast functions being called,
 288     * put the module to sleep.
 289     */
 290    if (++swrast->StateChanges > 10) {
 291       swrast->InvalidateState = _swrast_sleep;
 292       swrast->NewState = ~0;
 293       new_state = ~0;
 294    }
 295
 296    if (new_state & swrast->invalidate_triangle)
 297       swrast->Triangle = _swrast_validate_triangle;
 298
 299    if (new_state & swrast->invalidate_line)
 300       swrast->Line = _swrast_validate_line;
 301
 302    if (new_state & swrast->invalidate_point)
 303       swrast->Point = _swrast_validate_point;
 304
 305    if (new_state & swrast->invalidate_quad)
 306       swrast->Quad = _swrast_validate_quad;
 307
 308    if (new_state & _SWRAST_NEW_BLEND_FUNC)
 309       swrast->BlendFunc = _swrast_validate_blend_func;
 310
 311    if (new_state & _SWRAST_NEW_TEXTURE_SAMPLE_FUNC)
 312       for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 313          swrast->TextureSample[i] = _swrast_validate_texture_sample;
 314 }
 315
 316
 317
 318 void
 319 _swrast_validate_derived( GLcontext *ctx )
 320 {
 321    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 322
 323    if (swrast->NewState)
 324    {
 325       if (swrast->NewState & _SWRAST_NEW_RASTERMASK)
 326          _swrast_update_rasterflags( ctx );
 327
 328       if (swrast->NewState & _NEW_TEXTURE)
 329          swrast->_MultiTextureEnabled =
 330             ctx->Texture._ReallyEnabled > TEXTURE0_ANY;
 331
 332       if (swrast->NewState & _NEW_POLYGON)
 333          _swrast_update_polygon( ctx );
 334
 335       if (swrast->NewState & _NEW_HINT)
 336          _swrast_update_hint( ctx );
 337
 338       swrast->NewState = 0;
 339       swrast->StateChanges = 0;
 340       swrast->InvalidateState = _swrast_invalidate_state;
 341    }
 342 }
 343
 344
 345
 346 /* Public entrypoints:  See also s_accum.c, s_bitmap.c, etc.
 347  */
 348 void
 349 _swrast_Quad( GLcontext *ctx,
 350               const SWvertex *v0, const SWvertex *v1,
 351               const SWvertex *v2, const SWvertex *v3 )
 352 {
 353 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 354 /*     _swrast_print_vertex( ctx, v0 ); */
 355 /*     _swrast_print_vertex( ctx, v1 ); */
 356 /*     _swrast_print_vertex( ctx, v2 ); */
 357 /*     _swrast_print_vertex( ctx, v3 ); */
 358    SWRAST_CONTEXT(ctx)->Quad( ctx, v0, v1, v2, v3 );
 359 }
 360
 361 void
 362 _swrast_Triangle( GLcontext *ctx, const SWvertex *v0,
 363                   const SWvertex *v1, const SWvertex *v2 )
 364 {
 365 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 366 /*     _swrast_print_vertex( ctx, v0 ); */
 367 /*     _swrast_print_vertex( ctx, v1 ); */
 368 /*     _swrast_print_vertex( ctx, v2 ); */
 369    SWRAST_CONTEXT(ctx)->Triangle( ctx, v0, v1, v2 );
 370 }
 371
 372 void
 373 _swrast_Line( GLcontext *ctx, const SWvertex *v0, const SWvertex *v1 )
 374 {
 375 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 376 /*     _swrast_print_vertex( ctx, v0 ); */
 377 /*     _swrast_print_vertex( ctx, v1 ); */
 378    SWRAST_CONTEXT(ctx)->Line( ctx, v0, v1 );
 379 }
 380
 381 void
 382 _swrast_Point( GLcontext *ctx, const SWvertex *v0 )
 383 {
 384 /*     fprintf(stderr, "%s\n", __FUNCTION__); */
 385 /*     _swrast_print_vertex( ctx, v0 ); */
 386    SWRAST_CONTEXT(ctx)->Point( ctx, v0 );
 387 }
 388
 389 void
 390 _swrast_InvalidateState( GLcontext *ctx, GLuint new_state )
 391 {
 392    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, new_state );
 393 }
 394
 395 void
 396 _swrast_ResetLineStipple( GLcontext *ctx )
 397 {
 398    SWRAST_CONTEXT(ctx)->StippleCounter = 0;
 399 }
 400
 401 void
 402 _swrast_allow_vertex_fog( GLcontext *ctx, GLboolean value )
 403 {
 404    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 405    SWRAST_CONTEXT(ctx)->AllowVertexFog = value;
 406 }
 407
 408 void
 409 _swrast_allow_pixel_fog( GLcontext *ctx, GLboolean value )
 410 {
 411    SWRAST_CONTEXT(ctx)->InvalidateState( ctx, _NEW_HINT );
 412    SWRAST_CONTEXT(ctx)->AllowPixelFog = value;
 413 }
 414
 415
 416 GLboolean
 417 _swrast_CreateContext( GLcontext *ctx )
 418 {
 419    GLuint i;
 420    SWcontext *swrast = (SWcontext *)CALLOC(sizeof(SWcontext));
 421    if (!swrast)
 422       return GL_FALSE;
 423
 424    swrast->PB = gl_alloc_pb();
 425    if (!swrast->PB) {
 426       FREE(swrast);
 427       return GL_FALSE;
 428    }
 429
 430    swrast->NewState = ~0;
 431
 432    swrast->choose_point = _swrast_choose_point;
 433    swrast->choose_line = _swrast_choose_line;
 434    swrast->choose_triangle = _swrast_choose_triangle;
 435    swrast->choose_quad = _swrast_choose_quad;
 436
 437    swrast->invalidate_point = _SWRAST_NEW_POINT;
 438    swrast->invalidate_line = _SWRAST_NEW_LINE;
 439    swrast->invalidate_triangle = _SWRAST_NEW_TRIANGLE;
 440    swrast->invalidate_quad = _SWRAST_NEW_QUAD;
 441
 442    swrast->Point = _swrast_validate_point;
 443    swrast->Line = _swrast_validate_line;
 444    swrast->Triangle = _swrast_validate_triangle;
 445    swrast->Quad = _swrast_validate_quad;
 446    swrast->InvalidateState = _swrast_sleep;
 447    swrast->BlendFunc = _swrast_validate_blend_func;
 448
 449    swrast->AllowVertexFog = GL_TRUE;
 450    swrast->AllowPixelFog = GL_TRUE;
 451
 452    /* Optimized Accum buffer */
 453    swrast->_IntegerAccumMode = GL_TRUE;
 454    swrast->_IntegerAccumScaler = 0.0;
 455
 456
 457    for (i = 0 ; i < MAX_TEXTURE_UNITS ; i++)
 458       swrast->TextureSample[i] = _swrast_validate_texture_sample;
 459
 460    ctx->swrast_context = swrast;
 461    return GL_TRUE;
 462 }
 463
 464 void
 465 _swrast_DestroyContext( GLcontext *ctx )
 466 {
 467    SWcontext *swrast = SWRAST_CONTEXT(ctx);
 468
 469    FREE( swrast->PB );
 470    FREE( swrast );
 471
 472    ctx->swrast_context = 0;
 473 }
 474
 475
 476 void
 477 _swrast_print_vertex( GLcontext *ctx, const SWvertex *v )
 478 {
 479    GLuint i;
 480
 481    fprintf(stderr, "win %f %f %f %f\n",
 482            v->win[0], v->win[1], v->win[2], v->win[3]);
 483
 484    for (i = 0 ; i < ctx->Const.MaxTextureUnits ; i++)
 485       fprintf(stderr, "texcoord[%d] %f %f %f %f\n", i,
 486               v->texcoord[i][0], v->texcoord[i][1],
 487               v->texcoord[i][2], v->texcoord[i][3]);
 488
 489    fprintf(stderr, "color %d %d %d %d\n",
 490            v->color[0], v->color[1], v->color[2], v->color[3]);
 491    fprintf(stderr, "spec %d %d %d %d\n",
 492            v->specular[0], v->specular[1], v->specular[2], v->specular[3]);
 493    fprintf(stderr, "fog %f\n", v->fog);
 494    fprintf(stderr, "index %d\n", v->index);
 495    fprintf(stderr, "pointsize %f\n", v->pointSize);
 496    fprintf(stderr, "\n");
 497 }