src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.13 2000/10/28 20:41:14 brianp 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 }
 108
 109
 110
 111 void
 112 _mesa_PassThrough( GLfloat token )
 113 {
 114    GET_CURRENT_CONTEXT(ctx);
 115    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
 116
 117    if (ctx->RenderMode==GL_FEEDBACK) {
 118       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 119       FEEDBACK_TOKEN( ctx, token );
 120    }
 121 }
 122
 123
 124
 125 /*
 126  * Put a vertex into the feedback buffer.
 127  */
 128 void gl_feedback_vertex( GLcontext *ctx,
 129                          const GLfloat win[4],
 130                          const GLfloat color[4],
 131                          GLuint index,
 132                          const GLfloat texcoord[4] )
 133 {
 134    FEEDBACK_TOKEN( ctx, win[0] );
 135    FEEDBACK_TOKEN( ctx, win[1] );
 136    if (ctx->Feedback.Mask & FB_3D) {
 137       FEEDBACK_TOKEN( ctx, win[2] );
 138    }
 139    if (ctx->Feedback.Mask & FB_4D) {
 140       FEEDBACK_TOKEN( ctx, win[3] );
 141    }
 142    if (ctx->Feedback.Mask & FB_INDEX) {
 143       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 144    }
 145    if (ctx->Feedback.Mask & FB_COLOR) {
 146       FEEDBACK_TOKEN( ctx, color[0] );
 147       FEEDBACK_TOKEN( ctx, color[1] );
 148       FEEDBACK_TOKEN( ctx, color[2] );
 149       FEEDBACK_TOKEN( ctx, color[3] );
 150    }
 151    if (ctx->Feedback.Mask & FB_TEXTURE) {
 152       FEEDBACK_TOKEN( ctx, texcoord[0] );
 153       FEEDBACK_TOKEN( ctx, texcoord[1] );
 154       FEEDBACK_TOKEN( ctx, texcoord[2] );
 155       FEEDBACK_TOKEN( ctx, texcoord[3] );
 156    }
 157 }
 158
 159
 160
 161 static void feedback_vertex( GLcontext *ctx, GLuint v, GLuint pv )
 162 {
 163    GLfloat win[4];
 164    GLfloat color[4];
 165    GLfloat tc[4];
 166    GLuint texUnit = ctx->Texture.CurrentTransformUnit;
 167    const struct vertex_buffer *VB = ctx->VB;
 168    GLuint index;
 169
 170    win[0] = VB->Win.data[v][0];
 171    win[1] = VB->Win.data[v][1];
 172    win[2] = VB->Win.data[v][2] / ctx->Visual.DepthMaxF;
 173    win[3] = 1.0 / VB->Win.data[v][3];
 174
 175    if (ctx->Light.ShadeModel == GL_SMOOTH)
 176       pv = v;
 177
 178    color[0] = CHAN_TO_FLOAT(VB->ColorPtr->data[pv][0]);
 179    color[1] = CHAN_TO_FLOAT(VB->ColorPtr->data[pv][1]);
 180    color[2] = CHAN_TO_FLOAT(VB->ColorPtr->data[pv][2]);
 181    color[3] = CHAN_TO_FLOAT(VB->ColorPtr->data[pv][3]);
 182
 183    if (VB->TexCoordPtr[texUnit]->size == 4 &&
 184        VB->TexCoordPtr[texUnit]->data[v][3] != 0.0) {
 185       GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
 186       tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
 187       tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
 188       tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
 189       tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
 190    }
 191    else {
 192       ASSIGN_4V(tc, 0,0,0,1);
 193       COPY_SZ_4V(tc,
 194                  VB->TexCoordPtr[texUnit]->size,
 195                  VB->TexCoordPtr[texUnit]->data[v]);
 196    }
 197
 198    if (VB->IndexPtr)
 199       index = VB->IndexPtr->data[v];
 200    else
 201       index = 0;
 202
 203    gl_feedback_vertex( ctx, win, color, index, tc );
 204 }
 205
 206
 207
 208 /*
 209  * Put triangle in feedback buffer.
 210  */
 211 void gl_feedback_triangle( GLcontext *ctx,
 212                            GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 213 {
 214    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 215       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
 216       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
 217
 218       feedback_vertex( ctx, v0, pv );
 219       feedback_vertex( ctx, v1, pv );
 220       feedback_vertex( ctx, v2, pv );
 221    }
 222 }
 223
 224
 225 void gl_feedback_line( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv )
 226 {
 227    GLenum token = GL_LINE_TOKEN;
 228
 229    if (ctx->StippleCounter==0)
 230       token = GL_LINE_RESET_TOKEN;
 231
 232    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 233
 234    feedback_vertex( ctx, v1, pv );
 235    feedback_vertex( ctx, v2, pv );
 236
 237    ctx->StippleCounter++;
 238 }
 239
 240
 241 void gl_feedback_points( GLcontext *ctx, GLuint first, GLuint last )
 242 {
 243    const struct vertex_buffer *VB = ctx->VB;
 244    GLuint i;
 245
 246    for (i=first;i<=last;i++) {
 247       if (VB->ClipMask[i]==0) {
 248          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 249          feedback_vertex( ctx, i, i );
 250       }
 251    }
 252 }
 253
 254
 255
 256
 257
 258 /**********************************************************************/
 259 /*                              Selection                             */
 260 /**********************************************************************/
 261
 262
 263 /*
 264  * NOTE: this function can't be put in a display list.
 265  */
 266 void
 267 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 268 {
 269    GET_CURRENT_CONTEXT(ctx);
 270    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
 271    if (ctx->RenderMode==GL_SELECT) {
 272       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 273    }
 274    ctx->Select.Buffer = buffer;
 275    ctx->Select.BufferSize = size;
 276    ctx->Select.BufferCount = 0;
 277
 278    ctx->Select.HitFlag = GL_FALSE;
 279    ctx->Select.HitMinZ = 1.0;
 280    ctx->Select.HitMaxZ = 0.0;
 281 }
 282
 283
 284 #define WRITE_RECORD( CTX, V )                                  \
 285         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 286            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 287         }                                                       \
 288         CTX->Select.BufferCount++;
 289
 290
 291
 292 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 293 {
 294    ctx->Select.HitFlag = GL_TRUE;
 295    if (z < ctx->Select.HitMinZ) {
 296       ctx->Select.HitMinZ = z;
 297    }
 298    if (z > ctx->Select.HitMaxZ) {
 299       ctx->Select.HitMaxZ = z;
 300    }
 301 }
 302
 303 void gl_select_triangle( GLcontext *ctx,
 304                          GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 305 {
 306    const struct vertex_buffer *VB = ctx->VB;
 307
 308    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 309       const GLfloat zs = 1.0F / ctx->Visual.DepthMaxF;
 310       gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
 311       gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
 312       gl_update_hitflag( ctx, VB->Win.data[v2][2] * zs );
 313    }
 314 }
 315
 316
 317 void gl_select_line( GLcontext *ctx,
 318                      GLuint v0, GLuint v1, GLuint pv )
 319 {
 320    const struct vertex_buffer *VB = ctx->VB;
 321    const GLfloat zs = 1.0F / ctx->Visual.DepthMaxF;
 322    gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
 323    gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
 324 }
 325
 326
 327 void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
 328 {
 329    struct vertex_buffer *VB = ctx->VB;
 330    const GLfloat zs = 1.0F / ctx->Visual.DepthMaxF;
 331    GLuint i;
 332
 333    for (i=first;i<=last;i++) {
 334       if (VB->ClipMask[i]==0) {
 335          gl_update_hitflag( ctx, VB->Win.data[i][2] * zs );
 336       }
 337    }
 338 }
 339
 340
 341 static void write_hit_record( GLcontext *ctx )
 342 {
 343    GLuint i;
 344    GLuint zmin, zmax, zscale = (~0u);
 345
 346    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 347    /* 2^32-1 and round to nearest unsigned integer. */
 348
 349    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 350    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 351    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 352
 353    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 354    WRITE_RECORD( ctx, zmin );
 355    WRITE_RECORD( ctx, zmax );
 356    for (i = 0; i < ctx->Select.NameStackDepth; i++) {
 357       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 358    }
 359
 360    ctx->Select.Hits++;
 361    ctx->Select.HitFlag = GL_FALSE;
 362    ctx->Select.HitMinZ = 1.0;
 363    ctx->Select.HitMaxZ = -1.0;
 364 }
 365
 366
 367
 368 void
 369 _mesa_InitNames( void )
 370 {
 371    GET_CURRENT_CONTEXT(ctx);
 372    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 373    /* Record the hit before the HitFlag is wiped out again. */
 374    if (ctx->RenderMode == GL_SELECT) {
 375       if (ctx->Select.HitFlag) {
 376          write_hit_record( ctx );
 377       }
 378    }
 379    ctx->Select.NameStackDepth = 0;
 380    ctx->Select.HitFlag = GL_FALSE;
 381    ctx->Select.HitMinZ = 1.0;
 382    ctx->Select.HitMaxZ = 0.0;
 383 }
 384
 385
 386
 387 void
 388 _mesa_LoadName( GLuint name )
 389 {
 390    GET_CURRENT_CONTEXT(ctx);
 391    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 392    if (ctx->RenderMode != GL_SELECT) {
 393       return;
 394    }
 395    if (ctx->Select.NameStackDepth == 0) {
 396       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 397       return;
 398    }
 399    if (ctx->Select.HitFlag) {
 400       write_hit_record( ctx );
 401    }
 402    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 403       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 404    }
 405    else {
 406       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 407    }
 408 }
 409
 410
 411 void
 412 _mesa_PushName( GLuint name )
 413 {
 414    GET_CURRENT_CONTEXT(ctx);
 415    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
 416    if (ctx->RenderMode != GL_SELECT) {
 417       return;
 418    }
 419    if (ctx->Select.HitFlag) {
 420       write_hit_record( ctx );
 421    }
 422    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 423       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 424    }
 425    else {
 426       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 427    }
 428 }
 429
 430
 431
 432 void
 433 _mesa_PopName( void )
 434 {
 435    GET_CURRENT_CONTEXT(ctx);
 436    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 437    if (ctx->RenderMode != GL_SELECT) {
 438       return;
 439    }
 440    if (ctx->Select.HitFlag) {
 441       write_hit_record( ctx );
 442    }
 443    if (ctx->Select.NameStackDepth > 0) {
 444       ctx->Select.NameStackDepth--;
 445    }
 446    else {
 447       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 448    }
 449 }
 450
 451
 452
 453 /**********************************************************************/
 454 /*                           Render Mode                              */
 455 /**********************************************************************/
 456
 457
 458
 459 /*
 460  * NOTE: this function can't be put in a display list.
 461  */
 462 GLint
 463 _mesa_RenderMode( GLenum mode )
 464 {
 465    GET_CURRENT_CONTEXT(ctx);
 466    GLint result;
 467
 468    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 469
 470    if (MESA_VERBOSE & VERBOSE_API)
 471       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 472
 473    ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 474
 475    switch (ctx->RenderMode) {
 476       case GL_RENDER:
 477          result = 0;
 478          break;
 479       case GL_SELECT:
 480          if (ctx->Select.HitFlag) {
 481             write_hit_record( ctx );
 482          }
 483          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 484             /* overflow */
 485 #ifdef DEBUG
 486             _mesa_warning(ctx, "Feedback buffer overflow");
 487 #endif
 488             result = -1;
 489          }
 490          else {
 491             result = ctx->Select.Hits;
 492          }
 493          ctx->Select.BufferCount = 0;
 494          ctx->Select.Hits = 0;
 495          ctx->Select.NameStackDepth = 0;
 496          break;
 497       case GL_FEEDBACK:
 498          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 499             /* overflow */
 500             result = -1;
 501          }
 502          else {
 503             result = ctx->Feedback.Count;
 504          }
 505          ctx->Feedback.Count = 0;
 506          break;
 507       default:
 508          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 509          return 0;
 510    }
 511
 512    switch (mode) {
 513       case GL_RENDER:
 514          break;
 515       case GL_SELECT:
 516          ctx->TriangleCaps |= DD_SELECT;
 517          if (ctx->Select.BufferSize==0) {
 518             /* haven't called glSelectBuffer yet */
 519             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 520          }
 521          break;
 522       case GL_FEEDBACK:
 523          ctx->TriangleCaps |= DD_FEEDBACK;
 524          if (ctx->Feedback.BufferSize==0) {
 525             /* haven't called glFeedbackBuffer yet */
 526             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 527          }
 528          break;
 529       default:
 530          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 531          return 0;
 532    }
 533
 534    ctx->RenderMode = mode;
 535    ctx->NewState |= NEW_ALL;
 536
 537    return result;
 538 }
 539