src/mesa/main/rastpos.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.3
   4  *
   5  * Copyright (C) 1999-2004  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
  25
  26 /**
  27  * \file rastpos.c
  28  * Raster position operations.
  29  */
  30
  31 #include "glheader.h"
  32 #include "colormac.h"
  33 #include "context.h"
  34 #include "feedback.h"
  35 #include "light.h"
  36 #include "macros.h"
  37 #include "rastpos.h"
  38 #include "state.h"
  39 #include "simple_list.h"
  40 #include "mtypes.h"
  41
  42 #include "math/m_matrix.h"
  43
  44
  45 /**
  46  * Clip a point against the view volume.
  47  *
  48  * \param v vertex vector describing the point to clip.
  49  *
  50  * \return zero if outside view volume, or one if inside.
  51  */
  52 static GLuint
  53 viewclip_point( const GLfloat v[] )
  54 {
  55    if (   v[0] > v[3] || v[0] < -v[3]
  56        || v[1] > v[3] || v[1] < -v[3]
  57        || v[2] > v[3] || v[2] < -v[3] ) {
  58       return 0;
  59    }
  60    else {
  61       return 1;
  62    }
  63 }
  64
  65
  66 /**
  67  * Clip a point against the far/near Z clipping planes.
  68  *
  69  * \param v vertex vector describing the point to clip.
  70  *
  71  * \return zero if outside view volume, or one if inside.
  72  */
  73 static GLuint
  74 viewclip_point_z( const GLfloat v[] )
  75 {
  76    if (v[2] > v[3] || v[2] < -v[3] ) {
  77       return 0;
  78    }
  79    else {
  80       return 1;
  81    }
  82 }
  83
  84
  85 /**
  86  * Clip a point against the user clipping planes.
  87  *
  88  * \param ctx GL context.
  89  * \param v vertex vector describing the point to clip.
  90  *
  91  * \return zero if the point was clipped, or one otherwise.
  92  */
  93 static GLuint
  94 userclip_point( GLcontext *ctx, const GLfloat v[] )
  95 {
  96    GLuint p;
  97
  98    for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
  99       if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
 100          GLfloat dot = v[0] * ctx->Transform._ClipUserPlane[p][0]
 101                      + v[1] * ctx->Transform._ClipUserPlane[p][1]
 102                      + v[2] * ctx->Transform._ClipUserPlane[p][2]
 103                      + v[3] * ctx->Transform._ClipUserPlane[p][3];
 104          if (dot < 0.0F) {
 105             return 0;
 106          }
 107       }
 108    }
 109
 110    return 1;
 111 }
 112
 113
 114 /**
 115  * This has been split off to allow the normal shade routines to
 116  * get a little closer to the vertex buffer, and to use the
 117  * GLvector objects directly.
 118  * \param ctx the context
 119  * \param vertex vertex location
 120  * \param normal normal vector
 121  * \param Rcolor returned color
 122  * \param Rspec returned specular color (if separate specular enabled)
 123  * \param Rindex returned color index
 124  */
 125 static void
 126 shade_rastpos(GLcontext *ctx,
 127               const GLfloat vertex[4],
 128               const GLfloat normal[3],
 129               GLfloat Rcolor[4],
 130               GLfloat Rspec[4],
 131               GLfloat *Rindex)
 132 {
 133    GLfloat (*base)[3] = ctx->Light._BaseColor;
 134    struct gl_light *light;
 135    GLfloat diffuseColor[4], specularColor[4];
 136    GLfloat diffuse = 0, specular = 0;
 137
 138    if (!ctx->_ShineTable[0] || !ctx->_ShineTable[1])
 139       _mesa_validate_all_lighting_tables( ctx );
 140
 141    COPY_3V(diffuseColor, base[0]);
 142    diffuseColor[3] = CLAMP(
 143       ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3], 0.0F, 1.0F );
 144    ASSIGN_4V(specularColor, 0.0, 0.0, 0.0, 0.0);
 145
 146    foreach (light, &ctx->Light.EnabledList) {
 147       GLfloat n_dot_h;
 148       GLfloat attenuation = 1.0;
 149       GLfloat VP[3];
 150       GLfloat n_dot_VP;
 151       GLfloat *h;
 152       GLfloat diffuseContrib[3], specularContrib[3];
 153       GLboolean normalized;
 154
 155       if (!(light->_Flags & LIGHT_POSITIONAL)) {
 156          COPY_3V(VP, light->_VP_inf_norm);
 157          attenuation = light->_VP_inf_spot_attenuation;
 158       }
 159       else {
 160          GLfloat d;
 161
 162          SUB_3V(VP, light->_Position, vertex);
 163          d = (GLfloat) LEN_3FV( VP );
 164
 165          if ( d > 1e-6) {
 166             GLfloat invd = 1.0F / d;
 167             SELF_SCALE_SCALAR_3V(VP, invd);
 168          }
 169          attenuation = 1.0F / (light->ConstantAttenuation + d *
 170                                (light->LinearAttenuation + d *
 171                                 light->QuadraticAttenuation));
 172
 173          if (light->_Flags & LIGHT_SPOT) {
 174             GLfloat PV_dot_dir = - DOT3(VP, light->_NormDirection);
 175
 176             if (PV_dot_dir<light->_CosCutoff) {
 177                continue;
 178             }
 179             else {
 180                double x = PV_dot_dir * (EXP_TABLE_SIZE-1);
 181                int k = (int) x;
 182                GLfloat spot = (GLfloat) (light->_SpotExpTable[k][0]
 183                                + (x-k)*light->_SpotExpTable[k][1]);
 184                attenuation *= spot;
 185             }
 186          }
 187       }
 188
 189       if (attenuation < 1e-3)
 190          continue;
 191
 192       n_dot_VP = DOT3( normal, VP );
 193
 194       if (n_dot_VP < 0.0F) {
 195          ACC_SCALE_SCALAR_3V(diffuseColor, attenuation, light->_MatAmbient[0]);
 196          continue;
 197       }
 198
 199       COPY_3V(diffuseContrib, light->_MatAmbient[0]);
 200       ACC_SCALE_SCALAR_3V(diffuseContrib, n_dot_VP, light->_MatDiffuse[0]);
 201       diffuse += n_dot_VP * light->_dli * attenuation;
 202       ASSIGN_3V(specularContrib, 0.0, 0.0, 0.0);
 203
 204       {
 205          if (ctx->Light.Model.LocalViewer) {
 206             GLfloat v[3];
 207             COPY_3V(v, vertex);
 208             NORMALIZE_3FV(v);
 209             SUB_3V(VP, VP, v);
 210             h = VP;
 211             normalized = 0;
 212          }
 213          else if (light->_Flags & LIGHT_POSITIONAL) {
 214             h = VP;
 215             ACC_3V(h, ctx->_EyeZDir);
 216             normalized = 0;
 217          }
 218          else {
 219             h = light->_h_inf_norm;
 220             normalized = 1;
 221          }
 222
 223          n_dot_h = DOT3(normal, h);
 224
 225          if (n_dot_h > 0.0F) {
 226             GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
 227             GLfloat spec_coef;
 228             GLfloat shininess = mat[MAT_ATTRIB_FRONT_SHININESS][0];
 229
 230             if (!normalized) {
 231                n_dot_h *= n_dot_h;
 232                n_dot_h /= LEN_SQUARED_3FV( h );
 233                shininess *= .5;
 234             }
 235
 236             GET_SHINE_TAB_ENTRY( ctx->_ShineTable[0], n_dot_h, spec_coef );
 237
 238             if (spec_coef > 1.0e-10) {
 239                if (ctx->Light.Model.ColorControl==GL_SEPARATE_SPECULAR_COLOR) {
 240                   ACC_SCALE_SCALAR_3V( specularContrib, spec_coef,
 241                                        light->_MatSpecular[0]);
 242                }
 243                else {
 244                   ACC_SCALE_SCALAR_3V( diffuseContrib, spec_coef,
 245                                        light->_MatSpecular[0]);
 246                }
 247                specular += spec_coef * light->_sli * attenuation;
 248             }
 249          }
 250       }
 251
 252       ACC_SCALE_SCALAR_3V( diffuseColor, attenuation, diffuseContrib );
 253       ACC_SCALE_SCALAR_3V( specularColor, attenuation, specularContrib );
 254    }
 255
 256    if (ctx->Visual.rgbMode) {
 257       Rcolor[0] = CLAMP(diffuseColor[0], 0.0F, 1.0F);
 258       Rcolor[1] = CLAMP(diffuseColor[1], 0.0F, 1.0F);
 259       Rcolor[2] = CLAMP(diffuseColor[2], 0.0F, 1.0F);
 260       Rcolor[3] = CLAMP(diffuseColor[3], 0.0F, 1.0F);
 261       Rspec[0] = CLAMP(specularColor[0], 0.0F, 1.0F);
 262       Rspec[1] = CLAMP(specularColor[1], 0.0F, 1.0F);
 263       Rspec[2] = CLAMP(specularColor[2], 0.0F, 1.0F);
 264       Rspec[3] = CLAMP(specularColor[3], 0.0F, 1.0F);
 265    }
 266    else {
 267       GLfloat *ind = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_INDEXES];
 268       GLfloat d_a = ind[MAT_INDEX_DIFFUSE] - ind[MAT_INDEX_AMBIENT];
 269       GLfloat s_a = ind[MAT_INDEX_SPECULAR] - ind[MAT_INDEX_AMBIENT];
 270       GLfloat i = (ind[MAT_INDEX_AMBIENT]
 271                    + diffuse * (1.0F-specular) * d_a
 272                    + specular * s_a);
 273       if (i > ind[MAT_INDEX_SPECULAR]) {
 274          i = ind[MAT_INDEX_SPECULAR];
 275       }
 276       *Rindex = i;
 277    }
 278 }
 279
 280
 281 /**
 282  * Do texgen needed for glRasterPos.
 283  * \param ctx  rendering context
 284  * \param vObj  object-space vertex coordinate
 285  * \param vEye  eye-space vertex coordinate
 286  * \param normal  vertex normal
 287  * \param unit  texture unit number
 288  * \param texcoord  incoming texcoord and resulting texcoord
 289  */
 290 static void
 291 compute_texgen(GLcontext *ctx, const GLfloat vObj[4], const GLfloat vEye[4],
 292                const GLfloat normal[3], GLuint unit, GLfloat texcoord[4])
 293 {
 294    const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
 295
 296    /* always compute sphere map terms, just in case */
 297    GLfloat u[3], two_nu, rx, ry, rz, m, mInv;
 298    COPY_3V(u, vEye);
 299    NORMALIZE_3FV(u);
 300    two_nu = 2.0F * DOT3(normal, u);
 301    rx = u[0] - normal[0] * two_nu;
 302    ry = u[1] - normal[1] * two_nu;
 303    rz = u[2] - normal[2] * two_nu;
 304    m = rx * rx + ry * ry + (rz + 1.0F) * (rz + 1.0F);
 305    if (m > 0.0F)
 306       mInv = 0.5F * _mesa_inv_sqrtf(m);
 307    else
 308       mInv = 0.0F;
 309
 310    if (texUnit->TexGenEnabled & S_BIT) {
 311       switch (texUnit->GenModeS) {
 312          case GL_OBJECT_LINEAR:
 313             texcoord[0] = DOT4(vObj, texUnit->ObjectPlaneS);
 314             break;
 315          case GL_EYE_LINEAR:
 316             texcoord[0] = DOT4(vEye, texUnit->EyePlaneS);
 317             break;
 318          case GL_SPHERE_MAP:
 319             texcoord[0] = rx * mInv + 0.5F;
 320             break;
 321          case GL_REFLECTION_MAP:
 322             texcoord[0] = rx;
 323             break;
 324          case GL_NORMAL_MAP:
 325             texcoord[0] = normal[0];
 326             break;
 327          default:
 328             _mesa_problem(ctx, "Bad S texgen in compute_texgen()");
 329             return;
 330       }
 331    }
 332
 333    if (texUnit->TexGenEnabled & T_BIT) {
 334       switch (texUnit->GenModeT) {
 335          case GL_OBJECT_LINEAR:
 336             texcoord[1] = DOT4(vObj, texUnit->ObjectPlaneT);
 337             break;
 338          case GL_EYE_LINEAR:
 339             texcoord[1] = DOT4(vEye, texUnit->EyePlaneT);
 340             break;
 341          case GL_SPHERE_MAP:
 342             texcoord[1] = ry * mInv + 0.5F;
 343             break;
 344          case GL_REFLECTION_MAP:
 345             texcoord[1] = ry;
 346             break;
 347          case GL_NORMAL_MAP:
 348             texcoord[1] = normal[1];
 349             break;
 350          default:
 351             _mesa_problem(ctx, "Bad T texgen in compute_texgen()");
 352             return;
 353       }
 354    }
 355
 356    if (texUnit->TexGenEnabled & R_BIT) {
 357       switch (texUnit->GenModeR) {
 358          case GL_OBJECT_LINEAR:
 359             texcoord[2] = DOT4(vObj, texUnit->ObjectPlaneR);
 360             break;
 361          case GL_EYE_LINEAR:
 362             texcoord[2] = DOT4(vEye, texUnit->EyePlaneR);
 363             break;
 364          case GL_REFLECTION_MAP:
 365             texcoord[2] = rz;
 366             break;
 367          case GL_NORMAL_MAP:
 368             texcoord[2] = normal[2];
 369             break;
 370          default:
 371             _mesa_problem(ctx, "Bad R texgen in compute_texgen()");
 372             return;
 373       }
 374    }
 375
 376    if (texUnit->TexGenEnabled & Q_BIT) {
 377       switch (texUnit->GenModeQ) {
 378          case GL_OBJECT_LINEAR:
 379             texcoord[3] = DOT4(vObj, texUnit->ObjectPlaneQ);
 380             break;
 381          case GL_EYE_LINEAR:
 382             texcoord[3] = DOT4(vEye, texUnit->EyePlaneQ);
 383             break;
 384          default:
 385             _mesa_problem(ctx, "Bad Q texgen in compute_texgen()");
 386             return;
 387       }
 388    }
 389 }
 390
 391
 392
 393 /**
 394  * Set the raster position for pixel operations.
 395  *
 396  * All glRasterPos command call this function to update the current
 397  * raster position.
 398  *
 399  * \param ctx GL context.
 400  * \param x x coordinate for the raster position.
 401  * \param y y coordinate for the raster position.
 402  * \param z z coordinate for the raster position.
 403  * \param w w coordinate for the raster position.
 404  *
 405  * \sa Called by _mesa_RasterPos4f().
 406  *
 407  * Flushes the vertices, transforms and clips the vertex coordinates, and
 408  * finally sets the current raster position and associated data in
 409  * __GLcontextRec::Current.  When in selection mode calls
 410  * _mesa_update_hitflag() with the current raster position.
 411  */
 412 static void
 413 raster_pos4f(GLcontext *ctx, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
 414 {
 415    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 416    FLUSH_CURRENT(ctx, 0);
 417
 418    if (ctx->NewState)
 419       _mesa_update_state( ctx );
 420
 421    if (ctx->VertexProgram._Enabled) {
 422       /* XXX implement this */
 423       _mesa_problem(ctx, "Vertex programs not implemented for glRasterPos");
 424       return;
 425    }
 426    else {
 427       GLfloat obj[4], eye[4], clip[4], ndc[3], d;
 428       GLfloat *norm, eyenorm[3];
 429       GLfloat *objnorm = ctx->Current.Attrib[VERT_ATTRIB_NORMAL];
 430
 431       ASSIGN_4V( obj, x, y, z, w );
 432       /* apply modelview matrix:  eye = MV * obj */
 433       TRANSFORM_POINT( eye, ctx->ModelviewMatrixStack.Top->m, obj );
 434       /* apply projection matrix:  clip = Proj * eye */
 435       TRANSFORM_POINT( clip, ctx->ProjectionMatrixStack.Top->m, eye );
 436
 437       /* clip to view volume */
 438       if (ctx->Transform.RasterPositionUnclipped) {
 439          /* GL_IBM_rasterpos_clip: only clip against Z */
 440          if (viewclip_point_z(clip) == 0) {
 441             ctx->Current.RasterPosValid = GL_FALSE;
 442             return;
 443          }
 444       }
 445       else if (viewclip_point(clip) == 0) {
 446          /* Normal OpenGL behaviour */
 447          ctx->Current.RasterPosValid = GL_FALSE;
 448          return;
 449       }
 450
 451       /* clip to user clipping planes */
 452       if (ctx->Transform.ClipPlanesEnabled && !userclip_point(ctx, clip)) {
 453          ctx->Current.RasterPosValid = GL_FALSE;
 454          return;
 455       }
 456
 457       /* ndc = clip / W */
 458       d = (clip[3] == 0.0F) ? 1.0F : 1.0F / clip[3];
 459       ndc[0] = clip[0] * d;
 460       ndc[1] = clip[1] * d;
 461       ndc[2] = clip[2] * d;
 462       /* wincoord = viewport_mapping(ndc) */
 463       ctx->Current.RasterPos[0] = (ndc[0] * ctx->Viewport._WindowMap.m[MAT_SX]
 464                                    + ctx->Viewport._WindowMap.m[MAT_TX]);
 465       ctx->Current.RasterPos[1] = (ndc[1] * ctx->Viewport._WindowMap.m[MAT_SY]
 466                                    + ctx->Viewport._WindowMap.m[MAT_TY]);
 467       ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport._WindowMap.m[MAT_SZ]
 468                                    + ctx->Viewport._WindowMap.m[MAT_TZ])
 469                                   / ctx->DrawBuffer->_DepthMaxF;
 470       ctx->Current.RasterPos[3] = clip[3];
 471
 472       /* compute raster distance */
 473       if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
 474          ctx->Current.RasterDistance = ctx->Current.Attrib[VERT_ATTRIB_FOG][0];
 475       else
 476          ctx->Current.RasterDistance =
 477                         SQRTF( eye[0]*eye[0] + eye[1]*eye[1] + eye[2]*eye[2] );
 478
 479       /* compute transformed normal vector (for lighting or texgen) */
 480       if (ctx->_NeedEyeCoords) {
 481          const GLfloat *inv = ctx->ModelviewMatrixStack.Top->inv;
 482          TRANSFORM_NORMAL( eyenorm, objnorm, inv );
 483          norm = eyenorm;
 484       }
 485       else {
 486          norm = objnorm;
 487       }
 488
 489       /* update raster color */
 490       if (ctx->Light.Enabled) {
 491          /* lighting */
 492          shade_rastpos( ctx, obj, norm,
 493                         ctx->Current.RasterColor,
 494                         ctx->Current.RasterSecondaryColor,
 495                         &ctx->Current.RasterIndex );
 496       }
 497       else {
 498          /* use current color or index */
 499          if (ctx->Visual.rgbMode) {
 500             COPY_4FV(ctx->Current.RasterColor,
 501                      ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 502             COPY_4FV(ctx->Current.RasterSecondaryColor,
 503                      ctx->Current.Attrib[VERT_ATTRIB_COLOR1]);
 504          }
 505          else {
 506             ctx->Current.RasterIndex = ctx->Current.Index;
 507          }
 508       }
 509
 510       /* texture coords */
 511       {
 512          GLuint u;
 513          for (u = 0; u < ctx->Const.MaxTextureCoordUnits; u++) {
 514             GLfloat tc[4];
 515             COPY_4V(tc, ctx->Current.Attrib[VERT_ATTRIB_TEX0 + u]);
 516             if (ctx->Texture.Unit[u].TexGenEnabled) {
 517                compute_texgen(ctx, obj, eye, norm, u, tc);
 518             }
 519             TRANSFORM_POINT(ctx->Current.RasterTexCoords[u],
 520                             ctx->TextureMatrixStack[u].Top->m, tc);
 521          }
 522       }
 523
 524       ctx->Current.RasterPosValid = GL_TRUE;
 525    }
 526
 527    if (ctx->RenderMode == GL_SELECT) {
 528       _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
 529    }
 530 }
 531
 532
 533 /** Calls _mesa_RasterPos4f() */
 534 void GLAPIENTRY
 535 _mesa_RasterPos2d(GLdouble x, GLdouble y)
 536 {
 537    _mesa_RasterPos4f((GLfloat) x, (GLfloat) y, 0.0F, 1.0F);
 538 }
 539
 540 /** Calls _mesa_RasterPos4f() */
 541 void GLAPIENTRY
 542 _mesa_RasterPos2f(GLfloat x, GLfloat y)
 543 {
 544    _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
 545 }
 546
 547 /** Calls _mesa_RasterPos4f() */
 548 void GLAPIENTRY
 549 _mesa_RasterPos2i(GLint x, GLint y)
 550 {
 551    _mesa_RasterPos4f((GLfloat) x, (GLfloat) y, 0.0F, 1.0F);
 552 }
 553
 554 /** Calls _mesa_RasterPos4f() */
 555 void GLAPIENTRY
 556 _mesa_RasterPos2s(GLshort x, GLshort y)
 557 {
 558    _mesa_RasterPos4f(x, y, 0.0F, 1.0F);
 559 }
 560
 561 /** Calls _mesa_RasterPos4f() */
 562 void GLAPIENTRY
 563 _mesa_RasterPos3d(GLdouble x, GLdouble y, GLdouble z)
 564 {
 565    _mesa_RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, 1.0F);
 566 }
 567
 568 /** Calls _mesa_RasterPos4f() */
 569 void GLAPIENTRY
 570 _mesa_RasterPos3f(GLfloat x, GLfloat y, GLfloat z)
 571 {
 572    _mesa_RasterPos4f(x, y, z, 1.0F);
 573 }
 574
 575 /** Calls _mesa_RasterPos4f() */
 576 void GLAPIENTRY
 577 _mesa_RasterPos3i(GLint x, GLint y, GLint z)
 578 {
 579    _mesa_RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, 1.0F);
 580 }
 581
 582 /** Calls _mesa_RasterPos4f() */
 583 void GLAPIENTRY
 584 _mesa_RasterPos3s(GLshort x, GLshort y, GLshort z)
 585 {
 586    _mesa_RasterPos4f(x, y, z, 1.0F);
 587 }
 588
 589 /** Calls _mesa_RasterPos4f() */
 590 void GLAPIENTRY
 591 _mesa_RasterPos4d(GLdouble x, GLdouble y, GLdouble z, GLdouble w)
 592 {
 593    _mesa_RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, (GLfloat) w);
 594 }
 595
 596 /** Calls raster_pos4f() */
 597 void GLAPIENTRY
 598 _mesa_RasterPos4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
 599 {
 600    GET_CURRENT_CONTEXT(ctx);
 601    raster_pos4f(ctx, x, y, z, w);
 602 }
 603
 604 /** Calls _mesa_RasterPos4f() */
 605 void GLAPIENTRY
 606 _mesa_RasterPos4i(GLint x, GLint y, GLint z, GLint w)
 607 {
 608    _mesa_RasterPos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, (GLfloat) w);
 609 }
 610
 611 /** Calls _mesa_RasterPos4f() */
 612 void GLAPIENTRY
 613 _mesa_RasterPos4s(GLshort x, GLshort y, GLshort z, GLshort w)
 614 {
 615    _mesa_RasterPos4f(x, y, z, w);
 616 }
 617
 618 /** Calls _mesa_RasterPos4f() */
 619 void GLAPIENTRY
 620 _mesa_RasterPos2dv(const GLdouble *v)
 621 {
 622    _mesa_RasterPos4f((GLfloat) v[0], (GLfloat) v[1], 0.0F, 1.0F);
 623 }
 624
 625 /** Calls _mesa_RasterPos4f() */
 626 void GLAPIENTRY
 627 _mesa_RasterPos2fv(const GLfloat *v)
 628 {
 629    _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
 630 }
 631
 632 /** Calls _mesa_RasterPos4f() */
 633 void GLAPIENTRY
 634 _mesa_RasterPos2iv(const GLint *v)
 635 {
 636    _mesa_RasterPos4f((GLfloat) v[0], (GLfloat) v[1], 0.0F, 1.0F);
 637 }
 638
 639 /** Calls _mesa_RasterPos4f() */
 640 void GLAPIENTRY
 641 _mesa_RasterPos2sv(const GLshort *v)
 642 {
 643    _mesa_RasterPos4f(v[0], v[1], 0.0F, 1.0F);
 644 }
 645
 646 /** Calls _mesa_RasterPos4f() */
 647 void GLAPIENTRY
 648 _mesa_RasterPos3dv(const GLdouble *v)
 649 {
 650    _mesa_RasterPos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], 1.0F);
 651 }
 652
 653 /** Calls _mesa_RasterPos4f() */
 654 void GLAPIENTRY
 655 _mesa_RasterPos3fv(const GLfloat *v)
 656 {
 657    _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
 658 }
 659
 660 /** Calls _mesa_RasterPos4f() */
 661 void GLAPIENTRY
 662 _mesa_RasterPos3iv(const GLint *v)
 663 {
 664    _mesa_RasterPos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], 1.0F);
 665 }
 666
 667 /** Calls _mesa_RasterPos4f() */
 668 void GLAPIENTRY
 669 _mesa_RasterPos3sv(const GLshort *v)
 670 {
 671    _mesa_RasterPos4f(v[0], v[1], v[2], 1.0F);
 672 }
 673
 674 /** Calls _mesa_RasterPos4f() */
 675 void GLAPIENTRY
 676 _mesa_RasterPos4dv(const GLdouble *v)
 677 {
 678    _mesa_RasterPos4f((GLfloat) v[0], (GLfloat) v[1],
 679                      (GLfloat) v[2], (GLfloat) v[3]);
 680 }
 681
 682 /** Calls _mesa_RasterPos4f() */
 683 void GLAPIENTRY
 684 _mesa_RasterPos4fv(const GLfloat *v)
 685 {
 686    _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
 687 }
 688
 689 /** Calls _mesa_RasterPos4f() */
 690 void GLAPIENTRY
 691 _mesa_RasterPos4iv(const GLint *v)
 692 {
 693    _mesa_RasterPos4f((GLfloat) v[0], (GLfloat) v[1],
 694                      (GLfloat) v[2], (GLfloat) v[3]);
 695 }
 696
 697 /** Calls _mesa_RasterPos4f() */
 698 void GLAPIENTRY
 699 _mesa_RasterPos4sv(const GLshort *v)
 700 {
 701    _mesa_RasterPos4f(v[0], v[1], v[2], v[3]);
 702 }
 703
 704
 705 /**********************************************************************/
 706 /***           GL_ARB_window_pos / GL_MESA_window_pos               ***/
 707 /**********************************************************************/
 708
 709 #if FEATURE_windowpos
 710 /**
 711  * All glWindowPosMESA and glWindowPosARB commands call this function to
 712  * update the current raster position.
 713  */
 714 static void
 715 window_pos3f(GLfloat x, GLfloat y, GLfloat z)
 716 {
 717    GET_CURRENT_CONTEXT(ctx);
 718    GLfloat z2;
 719
 720    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 721    FLUSH_CURRENT(ctx, 0);
 722
 723    z2 = CLAMP(z, 0.0F, 1.0F) * (ctx->Viewport.Far - ctx->Viewport.Near)
 724       + ctx->Viewport.Near;
 725
 726    /* set raster position */
 727    ctx->Current.RasterPos[0] = x;
 728    ctx->Current.RasterPos[1] = y;
 729    ctx->Current.RasterPos[2] = z2;
 730    ctx->Current.RasterPos[3] = 1.0F;
 731
 732    ctx->Current.RasterPosValid = GL_TRUE;
 733
 734    if (ctx->Fog.FogCoordinateSource == GL_FOG_COORDINATE_EXT)
 735       ctx->Current.RasterDistance = ctx->Current.Attrib[VERT_ATTRIB_FOG][0];
 736    else
 737       ctx->Current.RasterDistance = 0.0;
 738
 739    /* raster color = current color or index */
 740    if (ctx->Visual.rgbMode) {
 741       ctx->Current.RasterColor[0]
 742          = CLAMP(ctx->Current.Attrib[VERT_ATTRIB_COLOR0][0], 0.0F, 1.0F);
 743       ctx->Current.RasterColor[1]
 744          = CLAMP(ctx->Current.Attrib[VERT_ATTRIB_COLOR0][1], 0.0F, 1.0F);
 745       ctx->Current.RasterColor[2]
 746          = CLAMP(ctx->Current.Attrib[VERT_ATTRIB_COLOR0][2], 0.0F, 1.0F);
 747       ctx->Current.RasterColor[3]
 748          = CLAMP(ctx->Current.Attrib[VERT_ATTRIB_COLOR0][3], 0.0F, 1.0F);
 749       ctx->Current.RasterSecondaryColor[0]
 750          = CLAMP(ctx->Current.Attrib[VERT_ATTRIB_COLOR1][0], 0.0F, 1.0F);
 751       ctx->Current.RasterSecondaryColor[1]
 752          = CLAMP(ctx->Current.Attrib[VERT_ATTRIB_COLOR1][1], 0.0F, 1.0F);
 753       ctx->Current.RasterSecondaryColor[2]
 754          = CLAMP(ctx->Current.Attrib[VERT_ATTRIB_COLOR1][2], 0.0F, 1.0F);
 755       ctx->Current.RasterSecondaryColor[3]
 756          = CLAMP(ctx->Current.Attrib[VERT_ATTRIB_COLOR1][3], 0.0F, 1.0F);
 757    }
 758    else {
 759       ctx->Current.RasterIndex = ctx->Current.Index;
 760    }
 761
 762    /* raster texcoord = current texcoord */
 763    {
 764       GLuint texSet;
 765       for (texSet = 0; texSet < ctx->Const.MaxTextureCoordUnits; texSet++) {
 766          COPY_4FV( ctx->Current.RasterTexCoords[texSet],
 767                   ctx->Current.Attrib[VERT_ATTRIB_TEX0 + texSet] );
 768       }
 769    }
 770
 771    if (ctx->RenderMode==GL_SELECT) {
 772       _mesa_update_hitflag( ctx, ctx->Current.RasterPos[2] );
 773    }
 774 }
 775
 776
 777 /* This is just to support the GL_MESA_window_pos version */
 778 static void
 779 window_pos4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
 780 {
 781    GET_CURRENT_CONTEXT(ctx);
 782    window_pos3f(x, y, z);
 783    ctx->Current.RasterPos[3] = w;
 784 }
 785
 786
 787 void GLAPIENTRY
 788 _mesa_WindowPos2dMESA(GLdouble x, GLdouble y)
 789 {
 790    window_pos4f((GLfloat) x, (GLfloat) y, 0.0F, 1.0F);
 791 }
 792
 793 void GLAPIENTRY
 794 _mesa_WindowPos2fMESA(GLfloat x, GLfloat y)
 795 {
 796    window_pos4f(x, y, 0.0F, 1.0F);
 797 }
 798
 799 void GLAPIENTRY
 800 _mesa_WindowPos2iMESA(GLint x, GLint y)
 801 {
 802    window_pos4f((GLfloat) x, (GLfloat) y, 0.0F, 1.0F);
 803 }
 804
 805 void GLAPIENTRY
 806 _mesa_WindowPos2sMESA(GLshort x, GLshort y)
 807 {
 808    window_pos4f(x, y, 0.0F, 1.0F);
 809 }
 810
 811 void GLAPIENTRY
 812 _mesa_WindowPos3dMESA(GLdouble x, GLdouble y, GLdouble z)
 813 {
 814    window_pos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, 1.0F);
 815 }
 816
 817 void GLAPIENTRY
 818 _mesa_WindowPos3fMESA(GLfloat x, GLfloat y, GLfloat z)
 819 {
 820    window_pos4f(x, y, z, 1.0F);
 821 }
 822
 823 void GLAPIENTRY
 824 _mesa_WindowPos3iMESA(GLint x, GLint y, GLint z)
 825 {
 826    window_pos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, 1.0F);
 827 }
 828
 829 void GLAPIENTRY
 830 _mesa_WindowPos3sMESA(GLshort x, GLshort y, GLshort z)
 831 {
 832    window_pos4f(x, y, z, 1.0F);
 833 }
 834
 835 void GLAPIENTRY
 836 _mesa_WindowPos4dMESA(GLdouble x, GLdouble y, GLdouble z, GLdouble w)
 837 {
 838    window_pos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, (GLfloat) w);
 839 }
 840
 841 void GLAPIENTRY
 842 _mesa_WindowPos4fMESA(GLfloat x, GLfloat y, GLfloat z, GLfloat w)
 843 {
 844    window_pos4f(x, y, z, w);
 845 }
 846
 847 void GLAPIENTRY
 848 _mesa_WindowPos4iMESA(GLint x, GLint y, GLint z, GLint w)
 849 {
 850    window_pos4f((GLfloat) x, (GLfloat) y, (GLfloat) z, (GLfloat) w);
 851 }
 852
 853 void GLAPIENTRY
 854 _mesa_WindowPos4sMESA(GLshort x, GLshort y, GLshort z, GLshort w)
 855 {
 856    window_pos4f(x, y, z, w);
 857 }
 858
 859 void GLAPIENTRY
 860 _mesa_WindowPos2dvMESA(const GLdouble *v)
 861 {
 862    window_pos4f((GLfloat) v[0], (GLfloat) v[1], 0.0F, 1.0F);
 863 }
 864
 865 void GLAPIENTRY
 866 _mesa_WindowPos2fvMESA(const GLfloat *v)
 867 {
 868    window_pos4f(v[0], v[1], 0.0F, 1.0F);
 869 }
 870
 871 void GLAPIENTRY
 872 _mesa_WindowPos2ivMESA(const GLint *v)
 873 {
 874    window_pos4f((GLfloat) v[0], (GLfloat) v[1], 0.0F, 1.0F);
 875 }
 876
 877 void GLAPIENTRY
 878 _mesa_WindowPos2svMESA(const GLshort *v)
 879 {
 880    window_pos4f(v[0], v[1], 0.0F, 1.0F);
 881 }
 882
 883 void GLAPIENTRY
 884 _mesa_WindowPos3dvMESA(const GLdouble *v)
 885 {
 886    window_pos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], 1.0F);
 887 }
 888
 889 void GLAPIENTRY
 890 _mesa_WindowPos3fvMESA(const GLfloat *v)
 891 {
 892    window_pos4f(v[0], v[1], v[2], 1.0);
 893 }
 894
 895 void GLAPIENTRY
 896 _mesa_WindowPos3ivMESA(const GLint *v)
 897 {
 898    window_pos4f((GLfloat) v[0], (GLfloat) v[1], (GLfloat) v[2], 1.0F);
 899 }
 900
 901 void GLAPIENTRY
 902 _mesa_WindowPos3svMESA(const GLshort *v)
 903 {
 904    window_pos4f(v[0], v[1], v[2], 1.0F);
 905 }
 906
 907 void GLAPIENTRY
 908 _mesa_WindowPos4dvMESA(const GLdouble *v)
 909 {
 910    window_pos4f((GLfloat) v[0], (GLfloat) v[1],
 911                          (GLfloat) v[2], (GLfloat) v[3]);
 912 }
 913
 914 void GLAPIENTRY
 915 _mesa_WindowPos4fvMESA(const GLfloat *v)
 916 {
 917    window_pos4f(v[0], v[1], v[2], v[3]);
 918 }
 919
 920 void GLAPIENTRY
 921 _mesa_WindowPos4ivMESA(const GLint *v)
 922 {
 923    window_pos4f((GLfloat) v[0], (GLfloat) v[1],
 924                          (GLfloat) v[2], (GLfloat) v[3]);
 925 }
 926
 927 void GLAPIENTRY
 928 _mesa_WindowPos4svMESA(const GLshort *v)
 929 {
 930    window_pos4f(v[0], v[1], v[2], v[3]);
 931 }
 932
 933 #endif
 934
 935 #if 0
 936
 937 /*
 938  * OpenGL implementation of glWindowPos*MESA()
 939  */
 940 void glWindowPos4fMESA( GLfloat x, GLfloat y, GLfloat z, GLfloat w )
 941 {
 942    GLfloat fx, fy;
 943
 944    /* Push current matrix mode and viewport attributes */
 945    glPushAttrib( GL_TRANSFORM_BIT | GL_VIEWPORT_BIT );
 946
 947    /* Setup projection parameters */
 948    glMatrixMode( GL_PROJECTION );
 949    glPushMatrix();
 950    glLoadIdentity();
 951    glMatrixMode( GL_MODELVIEW );
 952    glPushMatrix();
 953    glLoadIdentity();
 954
 955    glDepthRange( z, z );
 956    glViewport( (int) x - 1, (int) y - 1, 2, 2 );
 957
 958    /* set the raster (window) position */
 959    fx = x - (int) x;
 960    fy = y - (int) y;
 961    glRasterPos4f( fx, fy, 0.0, w );
 962
 963    /* restore matrices, viewport and matrix mode */
 964    glPopMatrix();
 965    glMatrixMode( GL_PROJECTION );
 966    glPopMatrix();
 967
 968    glPopAttrib();
 969 }
 970
 971 #endif
 972
 973
 974 /**********************************************************************/
 975 /** \name Initialization                                              */
 976 /**********************************************************************/
 977 /*@{*/
 978
 979 /**
 980  * Initialize the context current raster position information.
 981  *
 982  * \param ctx GL context.
 983  *
 984  * Initialize the current raster position information in
 985  * __GLcontextRec::Current, and adds the extension entry points to the
 986  * dispatcher.
 987  */
 988 void _mesa_init_rastpos( GLcontext * ctx )
 989 {
 990    int i;
 991
 992    ASSIGN_4V( ctx->Current.RasterPos, 0.0, 0.0, 0.0, 1.0 );
 993    ctx->Current.RasterDistance = 0.0;
 994    ASSIGN_4V( ctx->Current.RasterColor, 1.0, 1.0, 1.0, 1.0 );
 995    ctx->Current.RasterIndex = 1.0;
 996    for (i=0; i<MAX_TEXTURE_UNITS; i++)
 997       ASSIGN_4V( ctx->Current.RasterTexCoords[i], 0.0, 0.0, 0.0, 1.0 );
 998    ctx->Current.RasterPosValid = GL_TRUE;
 999 }
1000
1001 /*@}*/