src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.6 1999/11/11 01:22:26 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   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
  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       FEEDBACK_TOKEN( ctx, win[2] );
 137    }
 138    if (ctx->Feedback.Mask & FB_4D) {
 139       FEEDBACK_TOKEN( ctx, win[3] );
 140    }
 141    if (ctx->Feedback.Mask & FB_INDEX) {
 142       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 143    }
 144    if (ctx->Feedback.Mask & FB_COLOR) {
 145       FEEDBACK_TOKEN( ctx, color[0] );
 146       FEEDBACK_TOKEN( ctx, color[1] );
 147       FEEDBACK_TOKEN( ctx, color[2] );
 148       FEEDBACK_TOKEN( ctx, color[3] );
 149    }
 150    if (ctx->Feedback.Mask & FB_TEXTURE) {
 151       FEEDBACK_TOKEN( ctx, texcoord[0] );
 152       FEEDBACK_TOKEN( ctx, texcoord[1] );
 153       FEEDBACK_TOKEN( ctx, texcoord[2] );
 154       FEEDBACK_TOKEN( ctx, texcoord[3] );
 155    }
 156 }
 157
 158
 159
 160 static void gl_do_feedback_vertex( GLcontext *ctx, GLuint v, GLuint pv )
 161 {
 162    GLfloat win[4];
 163    GLfloat color[4];
 164    GLfloat tc[4];
 165    GLuint texUnit = ctx->Texture.CurrentTransformUnit;
 166    struct vertex_buffer *VB = ctx->VB;
 167
 168    win[0] = VB->Win.data[v][0];
 169    win[1] = VB->Win.data[v][1];
 170    win[2] = VB->Win.data[v][2] / DEPTH_SCALE;
 171    win[3] = 1.0 / VB->Win.data[v][3];
 172
 173    if (ctx->Light.ShadeModel==GL_SMOOTH) pv = v;
 174
 175    UBYTE_RGBA_TO_FLOAT_RGBA( color, VB->ColorPtr->data[pv] );
 176
 177    if (VB->TexCoordPtr[texUnit]->size == 4 &&
 178        VB->TexCoordPtr[texUnit]->data[v][3]!=0.0)
 179    {
 180       GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
 181       tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
 182       tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
 183       tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
 184       tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
 185    } else {
 186       ASSIGN_4V(tc, 0,0,0,1);
 187       COPY_SZ_4V(tc,
 188                  VB->TexCoordPtr[texUnit]->size,
 189                  VB->TexCoordPtr[texUnit]->data[v]);
 190    }
 191
 192    gl_feedback_vertex( ctx, win, color, VB->IndexPtr->data[v], tc );
 193 }
 194
 195
 196
 197 /*
 198  * Put triangle in feedback buffer.
 199  */
 200 void gl_feedback_triangle( GLcontext *ctx,
 201                            GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 202 {
 203    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 204       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
 205       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
 206
 207       gl_do_feedback_vertex( ctx, v0, pv );
 208       gl_do_feedback_vertex( ctx, v1, pv );
 209       gl_do_feedback_vertex( ctx, v2, pv );
 210    }
 211 }
 212
 213
 214 void gl_feedback_line( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv )
 215 {
 216    GLenum token = GL_LINE_TOKEN;
 217
 218    if (ctx->StippleCounter==0)
 219       token = GL_LINE_RESET_TOKEN;
 220
 221    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 222
 223    gl_do_feedback_vertex( ctx, v1, pv );
 224    gl_do_feedback_vertex( ctx, v2, pv );
 225
 226    ctx->StippleCounter++;
 227 }
 228
 229
 230 void gl_feedback_points( GLcontext *ctx, GLuint first, GLuint last )
 231 {
 232    struct vertex_buffer *VB = ctx->VB;
 233    GLuint i;
 234
 235    for (i=first;i<=last;i++)
 236       if (VB->ClipMask[i]==0) {
 237          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 238          gl_do_feedback_vertex( ctx, i, i );
 239       }
 240 }
 241
 242
 243
 244
 245
 246 /**********************************************************************/
 247 /*                              Selection                             */
 248 /**********************************************************************/
 249
 250
 251 /*
 252  * NOTE: this function can't be put in a display list.
 253  */
 254 void
 255 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 256 {
 257    GET_CURRENT_CONTEXT(ctx);
 258    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
 259    if (ctx->RenderMode==GL_SELECT) {
 260       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 261    }
 262    ctx->Select.Buffer = buffer;
 263    ctx->Select.BufferSize = size;
 264    ctx->Select.BufferCount = 0;
 265
 266    ctx->Select.HitFlag = GL_FALSE;
 267    ctx->Select.HitMinZ = 1.0;
 268    ctx->Select.HitMaxZ = 0.0;
 269 }
 270
 271
 272 #define WRITE_RECORD( CTX, V )                                  \
 273         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 274            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 275         }                                                       \
 276         CTX->Select.BufferCount++;
 277
 278
 279
 280 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 281 {
 282    ctx->Select.HitFlag = GL_TRUE;
 283    if (z < ctx->Select.HitMinZ) {
 284       ctx->Select.HitMinZ = z;
 285    }
 286    if (z > ctx->Select.HitMaxZ) {
 287       ctx->Select.HitMaxZ = z;
 288    }
 289 }
 290
 291 void gl_select_triangle( GLcontext *ctx,
 292                          GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 293 {
 294    struct vertex_buffer *VB = ctx->VB;
 295
 296    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 297       gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
 298       gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
 299       gl_update_hitflag( ctx, VB->Win.data[v2][3] / DEPTH_SCALE );
 300    }
 301 }
 302
 303
 304 void gl_select_line( GLcontext *ctx,
 305                      GLuint v0, GLuint v1, GLuint pv )
 306 {
 307    struct vertex_buffer *VB = ctx->VB;
 308
 309    gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
 310    gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
 311 }
 312
 313 void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
 314 {
 315    struct vertex_buffer *VB = ctx->VB;
 316    GLuint i;
 317
 318    for (i=first;i<=last;i++)
 319       if (VB->ClipMask[i]==0)
 320          gl_update_hitflag( ctx, VB->Win.data[i][3] / DEPTH_SCALE);
 321 }
 322
 323
 324 static void write_hit_record( GLcontext *ctx )
 325 {
 326    GLuint i;
 327    GLuint zmin, zmax, zscale = (~0u);
 328
 329    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 330    /* 2^32-1 and round to nearest unsigned integer. */
 331
 332    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 333    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 334    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 335
 336    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 337    WRITE_RECORD( ctx, zmin );
 338    WRITE_RECORD( ctx, zmax );
 339    for (i=0;i<ctx->Select.NameStackDepth;i++) {
 340       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 341    }
 342
 343    ctx->Select.Hits++;
 344    ctx->Select.HitFlag = GL_FALSE;
 345    ctx->Select.HitMinZ = 1.0;
 346    ctx->Select.HitMaxZ = -1.0;
 347 }
 348
 349
 350
 351 void
 352 _mesa_InitNames( void )
 353 {
 354    GET_CURRENT_CONTEXT(ctx);
 355    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 356    /* Record the hit before the HitFlag is wiped out again. */
 357    if (ctx->RenderMode==GL_SELECT) {
 358       if (ctx->Select.HitFlag) {
 359          write_hit_record( ctx );
 360       }
 361    }
 362    ctx->Select.NameStackDepth = 0;
 363    ctx->Select.HitFlag = GL_FALSE;
 364    ctx->Select.HitMinZ = 1.0;
 365    ctx->Select.HitMaxZ = 0.0;
 366 }
 367
 368
 369
 370 void
 371 _mesa_LoadName( GLuint name )
 372 {
 373    GET_CURRENT_CONTEXT(ctx);
 374    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 375    if (ctx->RenderMode!=GL_SELECT) {
 376       return;
 377    }
 378    if (ctx->Select.NameStackDepth==0) {
 379       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 380       return;
 381    }
 382    if (ctx->Select.HitFlag) {
 383       write_hit_record( ctx );
 384    }
 385    if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
 386       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 387    }
 388    else {
 389       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 390    }
 391 }
 392
 393
 394 void
 395 _mesa_PushName( GLuint name )
 396 {
 397    GET_CURRENT_CONTEXT(ctx);
 398    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
 399    if (ctx->RenderMode!=GL_SELECT) {
 400       return;
 401    }
 402    if (ctx->Select.HitFlag) {
 403       write_hit_record( ctx );
 404    }
 405    if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
 406       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 407    }
 408    else {
 409       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 410    }
 411 }
 412
 413
 414
 415 void
 416 _mesa_PopName( void )
 417 {
 418    GET_CURRENT_CONTEXT(ctx);
 419    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 420    if (ctx->RenderMode!=GL_SELECT) {
 421       return;
 422    }
 423    if (ctx->Select.HitFlag) {
 424       write_hit_record( ctx );
 425    }
 426    if (ctx->Select.NameStackDepth>0) {
 427       ctx->Select.NameStackDepth--;
 428    }
 429    else {
 430       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 431    }
 432 }
 433
 434
 435
 436 /**********************************************************************/
 437 /*                           Render Mode                              */
 438 /**********************************************************************/
 439
 440
 441
 442 /*
 443  * NOTE: this function can't be put in a display list.
 444  */
 445 GLint
 446 _mesa_RenderMode( GLenum mode )
 447 {
 448    GET_CURRENT_CONTEXT(ctx);
 449    GLint result;
 450
 451    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 452
 453    if (MESA_VERBOSE & VERBOSE_API)
 454       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 455
 456    ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 457
 458    switch (ctx->RenderMode) {
 459       case GL_RENDER:
 460          result = 0;
 461          break;
 462       case GL_SELECT:
 463          if (ctx->Select.HitFlag) {
 464             write_hit_record( ctx );
 465          }
 466          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 467             /* overflow */
 468 #ifdef DEBUG
 469             gl_warning(ctx, "Feedback buffer overflow");
 470 #endif
 471             result = -1;
 472          }
 473          else {
 474             result = ctx->Select.Hits;
 475          }
 476          ctx->Select.BufferCount = 0;
 477          ctx->Select.Hits = 0;
 478          ctx->Select.NameStackDepth = 0;
 479          break;
 480       case GL_FEEDBACK:
 481          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 482             /* overflow */
 483             result = -1;
 484          }
 485          else {
 486             result = ctx->Feedback.Count;
 487          }
 488          ctx->Feedback.Count = 0;
 489          break;
 490       default:
 491          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 492          return 0;
 493    }
 494
 495    switch (mode) {
 496       case GL_RENDER:
 497          break;
 498       case GL_SELECT:
 499          ctx->TriangleCaps |= DD_SELECT;
 500          if (ctx->Select.BufferSize==0) {
 501             /* haven't called glSelectBuffer yet */
 502             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 503          }
 504          break;
 505       case GL_FEEDBACK:
 506          ctx->TriangleCaps |= DD_FEEDBACK;
 507          if (ctx->Feedback.BufferSize==0) {
 508             /* haven't called glFeedbackBuffer yet */
 509             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 510          }
 511          break;
 512       default:
 513          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 514          return 0;
 515    }
 516
 517
 518    ctx->RenderMode = mode;
 519    ctx->NewState |= NEW_ALL;
 520
 521    return result;
 522 }
 523