src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.9 2000/03/03 17:47:39 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 "context.h"
  33 #include "enums.h"
  34 #include "feedback.h"
  35 #include "macros.h"
  36 #include "mmath.h"
  37 #include "types.h"
  38 #include "triangle.h"
  39 #endif
  40
  41
  42
  43 #define FB_3D           0x01
  44 #define FB_4D           0x02
  45 #define FB_INDEX        0x04
  46 #define FB_COLOR        0x08
  47 #define FB_TEXTURE      0X10
  48
  49
  50
  51 void
  52 _mesa_FeedbackBuffer( GLsizei size, GLenum type, GLfloat *buffer )
  53 {
  54    GET_CURRENT_CONTEXT(ctx);
  55    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glFeedbackBuffer" );
  56
  57    if (ctx->RenderMode==GL_FEEDBACK) {
  58       gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  59       return;
  60    }
  61
  62    if (size<0) {
  63       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  64       return;
  65    }
  66    if (!buffer) {
  67       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  68       ctx->Feedback.BufferSize = 0;
  69       return;
  70    }
  71
  72    switch (type) {
  73       case GL_2D:
  74          ctx->Feedback.Mask = 0;
  75          ctx->Feedback.Type = type;
  76          break;
  77       case GL_3D:
  78          ctx->Feedback.Mask = FB_3D;
  79          ctx->Feedback.Type = type;
  80          break;
  81       case GL_3D_COLOR:
  82          ctx->Feedback.Mask = FB_3D
  83                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX);
  84          ctx->Feedback.Type = type;
  85          break;
  86       case GL_3D_COLOR_TEXTURE:
  87          ctx->Feedback.Mask = FB_3D
  88                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
  89                            | FB_TEXTURE;
  90          ctx->Feedback.Type = type;
  91          break;
  92       case GL_4D_COLOR_TEXTURE:
  93          ctx->Feedback.Mask = FB_3D | FB_4D
  94                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
  95                            | FB_TEXTURE;
  96          ctx->Feedback.Type = type;
  97          break;
  98       default:
  99          ctx->Feedback.Mask = 0;
 100          gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
 101    }
 102
 103    ctx->Feedback.BufferSize = size;
 104    ctx->Feedback.Buffer = buffer;
 105    ctx->Feedback.Count = 0;
 106 }
 107
 108
 109
 110 void
 111 _mesa_PassThrough( GLfloat token )
 112 {
 113    GET_CURRENT_CONTEXT(ctx);
 114    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
 115
 116    if (ctx->RenderMode==GL_FEEDBACK) {
 117       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 118       FEEDBACK_TOKEN( ctx, token );
 119    }
 120 }
 121
 122
 123
 124 /*
 125  * Put a vertex into the feedback buffer.
 126  */
 127 void gl_feedback_vertex( GLcontext *ctx,
 128                          const GLfloat win[4],
 129                          const GLfloat color[4],
 130                          GLuint index,
 131                          const GLfloat texcoord[4] )
 132 {
 133    FEEDBACK_TOKEN( ctx, win[0] );
 134    FEEDBACK_TOKEN( ctx, win[1] );
 135    if (ctx->Feedback.Mask & FB_3D) {
 136       printf("FB %g\n", win[2]);
 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    UBYTE_RGBA_TO_FLOAT_RGBA( color, VB->ColorPtr->data[pv] );
 179
 180    if (VB->TexCoordPtr[texUnit]->size == 4 &&
 181        VB->TexCoordPtr[texUnit]->data[v][3] != 0.0) {
 182       GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
 183       tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
 184       tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
 185       tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
 186       tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
 187    }
 188    else {
 189       ASSIGN_4V(tc, 0,0,0,1);
 190       COPY_SZ_4V(tc,
 191                  VB->TexCoordPtr[texUnit]->size,
 192                  VB->TexCoordPtr[texUnit]->data[v]);
 193    }
 194
 195    if (VB->IndexPtr)
 196       index = VB->IndexPtr->data[v];
 197    else
 198       index = 0;
 199
 200    gl_feedback_vertex( ctx, win, color, index, tc );
 201 }
 202
 203
 204
 205 /*
 206  * Put triangle in feedback buffer.
 207  */
 208 void gl_feedback_triangle( GLcontext *ctx,
 209                            GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 210 {
 211    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 212       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
 213       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
 214
 215       feedback_vertex( ctx, v0, pv );
 216       feedback_vertex( ctx, v1, pv );
 217       feedback_vertex( ctx, v2, pv );
 218    }
 219 }
 220
 221
 222 void gl_feedback_line( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv )
 223 {
 224    GLenum token = GL_LINE_TOKEN;
 225
 226    if (ctx->StippleCounter==0)
 227       token = GL_LINE_RESET_TOKEN;
 228
 229    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 230
 231    feedback_vertex( ctx, v1, pv );
 232    feedback_vertex( ctx, v2, pv );
 233
 234    ctx->StippleCounter++;
 235 }
 236
 237
 238 void gl_feedback_points( GLcontext *ctx, GLuint first, GLuint last )
 239 {
 240    const struct vertex_buffer *VB = ctx->VB;
 241    GLuint i;
 242
 243    for (i=first;i<=last;i++) {
 244       if (VB->ClipMask[i]==0) {
 245          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 246          feedback_vertex( ctx, i, i );
 247       }
 248    }
 249 }
 250
 251
 252
 253
 254
 255 /**********************************************************************/
 256 /*                              Selection                             */
 257 /**********************************************************************/
 258
 259
 260 /*
 261  * NOTE: this function can't be put in a display list.
 262  */
 263 void
 264 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 265 {
 266    GET_CURRENT_CONTEXT(ctx);
 267    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
 268    if (ctx->RenderMode==GL_SELECT) {
 269       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 270    }
 271    ctx->Select.Buffer = buffer;
 272    ctx->Select.BufferSize = size;
 273    ctx->Select.BufferCount = 0;
 274
 275    ctx->Select.HitFlag = GL_FALSE;
 276    ctx->Select.HitMinZ = 1.0;
 277    ctx->Select.HitMaxZ = 0.0;
 278 }
 279
 280
 281 #define WRITE_RECORD( CTX, V )                                  \
 282         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 283            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 284         }                                                       \
 285         CTX->Select.BufferCount++;
 286
 287
 288
 289 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 290 {
 291    ctx->Select.HitFlag = GL_TRUE;
 292    if (z < ctx->Select.HitMinZ) {
 293       ctx->Select.HitMinZ = z;
 294    }
 295    if (z > ctx->Select.HitMaxZ) {
 296       ctx->Select.HitMaxZ = z;
 297    }
 298 }
 299
 300 void gl_select_triangle( GLcontext *ctx,
 301                          GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 302 {
 303    const struct vertex_buffer *VB = ctx->VB;
 304
 305    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 306       const GLfloat zs = 1.0F / ctx->Visual->DepthMaxF;
 307       gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
 308       gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
 309       gl_update_hitflag( ctx, VB->Win.data[v2][2] * zs );
 310    }
 311 }
 312
 313
 314 void gl_select_line( GLcontext *ctx,
 315                      GLuint v0, GLuint v1, GLuint pv )
 316 {
 317    const struct vertex_buffer *VB = ctx->VB;
 318    const GLfloat zs = 1.0F / ctx->Visual->DepthMaxF;
 319    gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
 320    gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
 321 }
 322
 323
 324 void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
 325 {
 326    struct vertex_buffer *VB = ctx->VB;
 327    const GLfloat zs = 1.0F / ctx->Visual->DepthMaxF;
 328    GLuint i;
 329
 330    for (i=first;i<=last;i++) {
 331       if (VB->ClipMask[i]==0) {
 332          gl_update_hitflag( ctx, VB->Win.data[i][2] * zs );
 333       }
 334    }
 335 }
 336
 337
 338 static void write_hit_record( GLcontext *ctx )
 339 {
 340    GLuint i;
 341    GLuint zmin, zmax, zscale = (~0u);
 342
 343    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 344    /* 2^32-1 and round to nearest unsigned integer. */
 345
 346    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 347    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 348    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 349
 350    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 351    WRITE_RECORD( ctx, zmin );
 352    WRITE_RECORD( ctx, zmax );
 353    for (i = 0; i < ctx->Select.NameStackDepth; i++) {
 354       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 355    }
 356
 357    ctx->Select.Hits++;
 358    ctx->Select.HitFlag = GL_FALSE;
 359    ctx->Select.HitMinZ = 1.0;
 360    ctx->Select.HitMaxZ = -1.0;
 361 }
 362
 363
 364
 365 void
 366 _mesa_InitNames( void )
 367 {
 368    GET_CURRENT_CONTEXT(ctx);
 369    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 370    /* Record the hit before the HitFlag is wiped out again. */
 371    if (ctx->RenderMode == GL_SELECT) {
 372       if (ctx->Select.HitFlag) {
 373          write_hit_record( ctx );
 374       }
 375    }
 376    ctx->Select.NameStackDepth = 0;
 377    ctx->Select.HitFlag = GL_FALSE;
 378    ctx->Select.HitMinZ = 1.0;
 379    ctx->Select.HitMaxZ = 0.0;
 380 }
 381
 382
 383
 384 void
 385 _mesa_LoadName( GLuint name )
 386 {
 387    GET_CURRENT_CONTEXT(ctx);
 388    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 389    if (ctx->RenderMode != GL_SELECT) {
 390       return;
 391    }
 392    if (ctx->Select.NameStackDepth == 0) {
 393       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 394       return;
 395    }
 396    if (ctx->Select.HitFlag) {
 397       write_hit_record( ctx );
 398    }
 399    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 400       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 401    }
 402    else {
 403       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 404    }
 405 }
 406
 407
 408 void
 409 _mesa_PushName( GLuint name )
 410 {
 411    GET_CURRENT_CONTEXT(ctx);
 412    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
 413    if (ctx->RenderMode != GL_SELECT) {
 414       return;
 415    }
 416    if (ctx->Select.HitFlag) {
 417       write_hit_record( ctx );
 418    }
 419    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 420       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 421    }
 422    else {
 423       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 424    }
 425 }
 426
 427
 428
 429 void
 430 _mesa_PopName( void )
 431 {
 432    GET_CURRENT_CONTEXT(ctx);
 433    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 434    if (ctx->RenderMode != GL_SELECT) {
 435       return;
 436    }
 437    if (ctx->Select.HitFlag) {
 438       write_hit_record( ctx );
 439    }
 440    if (ctx->Select.NameStackDepth > 0) {
 441       ctx->Select.NameStackDepth--;
 442    }
 443    else {
 444       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 445    }
 446 }
 447
 448
 449
 450 /**********************************************************************/
 451 /*                           Render Mode                              */
 452 /**********************************************************************/
 453
 454
 455
 456 /*
 457  * NOTE: this function can't be put in a display list.
 458  */
 459 GLint
 460 _mesa_RenderMode( GLenum mode )
 461 {
 462    GET_CURRENT_CONTEXT(ctx);
 463    GLint result;
 464
 465    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 466
 467    if (MESA_VERBOSE & VERBOSE_API)
 468       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 469
 470    ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 471
 472    switch (ctx->RenderMode) {
 473       case GL_RENDER:
 474          result = 0;
 475          break;
 476       case GL_SELECT:
 477          if (ctx->Select.HitFlag) {
 478             write_hit_record( ctx );
 479          }
 480          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 481             /* overflow */
 482 #ifdef DEBUG
 483             gl_warning(ctx, "Feedback buffer overflow");
 484 #endif
 485             result = -1;
 486          }
 487          else {
 488             result = ctx->Select.Hits;
 489          }
 490          ctx->Select.BufferCount = 0;
 491          ctx->Select.Hits = 0;
 492          ctx->Select.NameStackDepth = 0;
 493          break;
 494       case GL_FEEDBACK:
 495          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 496             /* overflow */
 497             result = -1;
 498          }
 499          else {
 500             result = ctx->Feedback.Count;
 501          }
 502          ctx->Feedback.Count = 0;
 503          break;
 504       default:
 505          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 506          return 0;
 507    }
 508
 509    switch (mode) {
 510       case GL_RENDER:
 511          break;
 512       case GL_SELECT:
 513          ctx->TriangleCaps |= DD_SELECT;
 514          if (ctx->Select.BufferSize==0) {
 515             /* haven't called glSelectBuffer yet */
 516             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 517          }
 518          break;
 519       case GL_FEEDBACK:
 520          ctx->TriangleCaps |= DD_FEEDBACK;
 521          if (ctx->Feedback.BufferSize==0) {
 522             /* haven't called glFeedbackBuffer yet */
 523             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 524          }
 525          break;
 526       default:
 527          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 528          return 0;
 529    }
 530
 531    ctx->RenderMode = mode;
 532    ctx->NewState |= NEW_ALL;
 533
 534    return result;
 535 }
 536