src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.14 2000/10/30 13:32:00 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  *
   7  * Copyright (C) 1999-2000  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
  27
  28 #ifdef PC_HEADER
  29 #include "all.h"
  30 #else
  31 #include "glheader.h"
  32 #include "colormac.h"
  33 #include "context.h"
  34 #include "enums.h"
  35 #include "feedback.h"
  36 #include "macros.h"
  37 #include "mmath.h"
  38 #include "types.h"
  39 #include "triangle.h"
  40 #endif
  41
  42
  43
  44 #define FB_3D           0x01
  45 #define FB_4D           0x02
  46 #define FB_INDEX        0x04
  47 #define FB_COLOR        0x08
  48 #define FB_TEXTURE      0X10
  49
  50
  51
  52 void
  53 _mesa_FeedbackBuffer( GLsizei size, GLenum type, GLfloat *buffer )
  54 {
  55    GET_CURRENT_CONTEXT(ctx);
  56    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glFeedbackBuffer" );
  57
  58    if (ctx->RenderMode==GL_FEEDBACK) {
  59       gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  60       return;
  61    }
  62
  63    if (size<0) {
  64       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  65       return;
  66    }
  67    if (!buffer) {
  68       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  69       ctx->Feedback.BufferSize = 0;
  70       return;
  71    }
  72
  73    switch (type) {
  74       case GL_2D:
  75          ctx->Feedback.Mask = 0;
  76          ctx->Feedback.Type = type;
  77          break;
  78       case GL_3D:
  79          ctx->Feedback.Mask = FB_3D;
  80          ctx->Feedback.Type = type;
  81          break;
  82       case GL_3D_COLOR:
  83          ctx->Feedback.Mask = FB_3D
  84                            | (ctx->Visual.RGBAflag ? FB_COLOR : FB_INDEX);
  85          ctx->Feedback.Type = type;
  86          break;
  87       case GL_3D_COLOR_TEXTURE:
  88          ctx->Feedback.Mask = FB_3D
  89                            | (ctx->Visual.RGBAflag ? FB_COLOR : FB_INDEX)
  90                            | FB_TEXTURE;
  91          ctx->Feedback.Type = type;
  92          break;
  93       case GL_4D_COLOR_TEXTURE:
  94          ctx->Feedback.Mask = FB_3D | FB_4D
  95                            | (ctx->Visual.RGBAflag ? FB_COLOR : FB_INDEX)
  96                            | FB_TEXTURE;
  97          ctx->Feedback.Type = type;
  98          break;
  99       default:
 100          ctx->Feedback.Mask = 0;
 101          gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
 102    }
 103
 104    ctx->Feedback.BufferSize = size;
 105    ctx->Feedback.Buffer = buffer;
 106    ctx->Feedback.Count = 0;
 107    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 108 }
 109
 110
 111
 112 void
 113 _mesa_PassThrough( GLfloat token )
 114 {
 115    GET_CURRENT_CONTEXT(ctx);
 116    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
 117
 118    if (ctx->RenderMode==GL_FEEDBACK) {
 119       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 120       FEEDBACK_TOKEN( ctx, token );
 121    }
 122 }
 123
 124
 125
 126 /*
 127  * Put a vertex into the feedback buffer.
 128  */
 129 void gl_feedback_vertex( GLcontext *ctx,
 130                          const GLfloat win[4],
 131                          const GLfloat color[4],
 132                          GLuint index,
 133                          const GLfloat texcoord[4] )
 134 {
 135    FEEDBACK_TOKEN( ctx, win[0] );
 136    FEEDBACK_TOKEN( ctx, win[1] );
 137    if (ctx->Feedback.Mask & FB_3D) {
 138       FEEDBACK_TOKEN( ctx, win[2] );
 139    }
 140    if (ctx->Feedback.Mask & FB_4D) {
 141       FEEDBACK_TOKEN( ctx, win[3] );
 142    }
 143    if (ctx->Feedback.Mask & FB_INDEX) {
 144       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 145    }
 146    if (ctx->Feedback.Mask & FB_COLOR) {
 147       FEEDBACK_TOKEN( ctx, color[0] );
 148       FEEDBACK_TOKEN( ctx, color[1] );
 149       FEEDBACK_TOKEN( ctx, color[2] );
 150       FEEDBACK_TOKEN( ctx, color[3] );
 151    }
 152    if (ctx->Feedback.Mask & FB_TEXTURE) {
 153       FEEDBACK_TOKEN( ctx, texcoord[0] );
 154       FEEDBACK_TOKEN( ctx, texcoord[1] );
 155       FEEDBACK_TOKEN( ctx, texcoord[2] );
 156       FEEDBACK_TOKEN( ctx, texcoord[3] );
 157    }
 158 }
 159
 160
 161
 162 static void feedback_vertex( GLcontext *ctx, GLuint v, GLuint pv )
 163 {
 164    GLfloat win[4];
 165    GLfloat color[4];
 166    GLfloat tc[4];
 167    GLuint texUnit = ctx->Texture.CurrentTransformUnit;
 168    const struct vertex_buffer *VB = ctx->VB;
 169    GLuint index;
 170
 171    win[0] = VB->Win.data[v][0];
 172    win[1] = VB->Win.data[v][1];
 173    win[2] = VB->Win.data[v][2] / ctx->Visual.DepthMaxF;
 174    win[3] = 1.0 / VB->Win.data[v][3];
 175
 176    if (ctx->Light.ShadeModel == GL_SMOOTH)
 177       pv = v;
 178
 179    color[0] = CHAN_TO_FLOAT(VB->ColorPtr->data[pv][0]);
 180    color[1] = CHAN_TO_FLOAT(VB->ColorPtr->data[pv][1]);
 181    color[2] = CHAN_TO_FLOAT(VB->ColorPtr->data[pv][2]);
 182    color[3] = CHAN_TO_FLOAT(VB->ColorPtr->data[pv][3]);
 183
 184    if (VB->TexCoordPtr[texUnit]->size == 4 &&
 185        VB->TexCoordPtr[texUnit]->data[v][3] != 0.0) {
 186       GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
 187       tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
 188       tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
 189       tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
 190       tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
 191    }
 192    else {
 193       ASSIGN_4V(tc, 0,0,0,1);
 194       COPY_SZ_4V(tc,
 195                  VB->TexCoordPtr[texUnit]->size,
 196                  VB->TexCoordPtr[texUnit]->data[v]);
 197    }
 198
 199    if (VB->IndexPtr)
 200       index = VB->IndexPtr->data[v];
 201    else
 202       index = 0;
 203
 204    gl_feedback_vertex( ctx, win, color, index, tc );
 205 }
 206
 207
 208
 209 /*
 210  * Put triangle in feedback buffer.
 211  */
 212 void gl_feedback_triangle( GLcontext *ctx,
 213                            GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 214 {
 215    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 216       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
 217       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
 218
 219       feedback_vertex( ctx, v0, pv );
 220       feedback_vertex( ctx, v1, pv );
 221       feedback_vertex( ctx, v2, pv );
 222    }
 223 }
 224
 225
 226 void gl_feedback_line( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv )
 227 {
 228    GLenum token = GL_LINE_TOKEN;
 229
 230    if (ctx->StippleCounter==0)
 231       token = GL_LINE_RESET_TOKEN;
 232
 233    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 234
 235    feedback_vertex( ctx, v1, pv );
 236    feedback_vertex( ctx, v2, pv );
 237
 238    ctx->StippleCounter++;
 239 }
 240
 241
 242 void gl_feedback_points( GLcontext *ctx, GLuint first, GLuint last )
 243 {
 244    const struct vertex_buffer *VB = ctx->VB;
 245    GLuint i;
 246
 247    for (i=first;i<=last;i++) {
 248       if (VB->ClipMask[i]==0) {
 249          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 250          feedback_vertex( ctx, i, i );
 251       }
 252    }
 253 }
 254
 255
 256
 257
 258
 259 /**********************************************************************/
 260 /*                              Selection                             */
 261 /**********************************************************************/
 262
 263
 264 /*
 265  * NOTE: this function can't be put in a display list.
 266  */
 267 void
 268 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 269 {
 270    GET_CURRENT_CONTEXT(ctx);
 271    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
 272    if (ctx->RenderMode==GL_SELECT) {
 273       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 274    }
 275    ctx->Select.Buffer = buffer;
 276    ctx->Select.BufferSize = size;
 277    ctx->Select.BufferCount = 0;
 278
 279    ctx->Select.HitFlag = GL_FALSE;
 280    ctx->Select.HitMinZ = 1.0;
 281    ctx->Select.HitMaxZ = 0.0;
 282
 283    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 284 }
 285
 286
 287 #define WRITE_RECORD( CTX, V )                                  \
 288         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 289            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 290         }                                                       \
 291         CTX->Select.BufferCount++;
 292
 293
 294
 295 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 296 {
 297    ctx->Select.HitFlag = GL_TRUE;
 298    if (z < ctx->Select.HitMinZ) {
 299       ctx->Select.HitMinZ = z;
 300    }
 301    if (z > ctx->Select.HitMaxZ) {
 302       ctx->Select.HitMaxZ = z;
 303    }
 304 }
 305
 306 void gl_select_triangle( GLcontext *ctx,
 307                          GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 308 {
 309    const struct vertex_buffer *VB = ctx->VB;
 310
 311    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 312       const GLfloat zs = 1.0F / ctx->Visual.DepthMaxF;
 313       gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
 314       gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
 315       gl_update_hitflag( ctx, VB->Win.data[v2][2] * zs );
 316    }
 317 }
 318
 319
 320 void gl_select_line( GLcontext *ctx,
 321                      GLuint v0, GLuint v1, GLuint pv )
 322 {
 323    const struct vertex_buffer *VB = ctx->VB;
 324    const GLfloat zs = 1.0F / ctx->Visual.DepthMaxF;
 325    gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
 326    gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
 327 }
 328
 329
 330 void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
 331 {
 332    struct vertex_buffer *VB = ctx->VB;
 333    const GLfloat zs = 1.0F / ctx->Visual.DepthMaxF;
 334    GLuint i;
 335
 336    for (i=first;i<=last;i++) {
 337       if (VB->ClipMask[i]==0) {
 338          gl_update_hitflag( ctx, VB->Win.data[i][2] * zs );
 339       }
 340    }
 341 }
 342
 343
 344 static void write_hit_record( GLcontext *ctx )
 345 {
 346    GLuint i;
 347    GLuint zmin, zmax, zscale = (~0u);
 348
 349    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 350    /* 2^32-1 and round to nearest unsigned integer. */
 351
 352    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 353    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 354    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 355
 356    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 357    WRITE_RECORD( ctx, zmin );
 358    WRITE_RECORD( ctx, zmax );
 359    for (i = 0; i < ctx->Select.NameStackDepth; i++) {
 360       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 361    }
 362
 363    ctx->Select.Hits++;
 364    ctx->Select.HitFlag = GL_FALSE;
 365    ctx->Select.HitMinZ = 1.0;
 366    ctx->Select.HitMaxZ = -1.0;
 367 }
 368
 369
 370
 371 void
 372 _mesa_InitNames( void )
 373 {
 374    GET_CURRENT_CONTEXT(ctx);
 375    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 376    /* Record the hit before the HitFlag is wiped out again. */
 377    if (ctx->RenderMode == GL_SELECT) {
 378       if (ctx->Select.HitFlag) {
 379          write_hit_record( ctx );
 380       }
 381    }
 382    ctx->Select.NameStackDepth = 0;
 383    ctx->Select.HitFlag = GL_FALSE;
 384    ctx->Select.HitMinZ = 1.0;
 385    ctx->Select.HitMaxZ = 0.0;
 386    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 387 }
 388
 389
 390
 391 void
 392 _mesa_LoadName( GLuint name )
 393 {
 394    GET_CURRENT_CONTEXT(ctx);
 395    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 396    if (ctx->RenderMode != GL_SELECT) {
 397       return;
 398    }
 399    if (ctx->Select.NameStackDepth == 0) {
 400       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 401       return;
 402    }
 403    if (ctx->Select.HitFlag) {
 404       write_hit_record( ctx );
 405    }
 406    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 407       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 408    }
 409    else {
 410       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 411    }
 412    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 413 }
 414
 415
 416 void
 417 _mesa_PushName( GLuint name )
 418 {
 419    GET_CURRENT_CONTEXT(ctx);
 420    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
 421    if (ctx->RenderMode != GL_SELECT) {
 422       return;
 423    }
 424    if (ctx->Select.HitFlag) {
 425       write_hit_record( ctx );
 426    }
 427    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 428       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 429    }
 430    else {
 431       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 432    }
 433    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 434 }
 435
 436
 437
 438 void
 439 _mesa_PopName( void )
 440 {
 441    GET_CURRENT_CONTEXT(ctx);
 442    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 443    if (ctx->RenderMode != GL_SELECT) {
 444       return;
 445    }
 446    if (ctx->Select.HitFlag) {
 447       write_hit_record( ctx );
 448    }
 449    if (ctx->Select.NameStackDepth > 0) {
 450       ctx->Select.NameStackDepth--;
 451    }
 452    else {
 453       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 454    }
 455    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 456 }
 457
 458
 459
 460 /**********************************************************************/
 461 /*                           Render Mode                              */
 462 /**********************************************************************/
 463
 464
 465
 466 /*
 467  * NOTE: this function can't be put in a display list.
 468  */
 469 GLint
 470 _mesa_RenderMode( GLenum mode )
 471 {
 472    GET_CURRENT_CONTEXT(ctx);
 473    GLint result;
 474
 475    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 476
 477    if (MESA_VERBOSE & VERBOSE_API)
 478       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 479
 480    ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 481
 482    switch (ctx->RenderMode) {
 483       case GL_RENDER:
 484          result = 0;
 485          break;
 486       case GL_SELECT:
 487          if (ctx->Select.HitFlag) {
 488             write_hit_record( ctx );
 489          }
 490          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 491             /* overflow */
 492 #ifdef DEBUG
 493             _mesa_warning(ctx, "Feedback buffer overflow");
 494 #endif
 495             result = -1;
 496          }
 497          else {
 498             result = ctx->Select.Hits;
 499          }
 500          ctx->Select.BufferCount = 0;
 501          ctx->Select.Hits = 0;
 502          ctx->Select.NameStackDepth = 0;
 503          ctx->NewState |= _NEW_FEEDBACK_SELECT;
 504          break;
 505       case GL_FEEDBACK:
 506          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 507             /* overflow */
 508             result = -1;
 509          }
 510          else {
 511             result = ctx->Feedback.Count;
 512          }
 513          ctx->Feedback.Count = 0;
 514          ctx->NewState |= _NEW_FEEDBACK_SELECT;
 515          break;
 516       default:
 517          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 518          return 0;
 519    }
 520
 521    switch (mode) {
 522       case GL_RENDER:
 523          break;
 524       case GL_SELECT:
 525          ctx->TriangleCaps |= DD_SELECT;
 526          if (ctx->Select.BufferSize==0) {
 527             /* haven't called glSelectBuffer yet */
 528             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 529          }
 530          break;
 531       case GL_FEEDBACK:
 532          ctx->TriangleCaps |= DD_FEEDBACK;
 533          if (ctx->Feedback.BufferSize==0) {
 534             /* haven't called glFeedbackBuffer yet */
 535             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 536          }
 537          break;
 538       default:
 539          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 540          return 0;
 541    }
 542
 543    ctx->RenderMode = mode;
 544    ctx->NewState |= _NEW_RENDERMODE;
 545
 546    return result;
 547 }
 548