src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.10 2000/05/09 23:54:09 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       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 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    const struct vertex_buffer *VB = ctx->VB;
 167    GLuint index;
 168
 169    win[0] = VB->Win.data[v][0];
 170    win[1] = VB->Win.data[v][1];
 171    win[2] = VB->Win.data[v][2] / ctx->Visual->DepthMaxF;
 172    win[3] = 1.0 / VB->Win.data[v][3];
 173
 174    if (ctx->Light.ShadeModel == GL_SMOOTH)
 175       pv = v;
 176
 177    UBYTE_RGBA_TO_FLOAT_RGBA( color, VB->ColorPtr->data[pv] );
 178
 179    if (VB->TexCoordPtr[texUnit]->size == 4 &&
 180        VB->TexCoordPtr[texUnit]->data[v][3] != 0.0) {
 181       GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
 182       tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
 183       tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
 184       tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
 185       tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
 186    }
 187    else {
 188       ASSIGN_4V(tc, 0,0,0,1);
 189       COPY_SZ_4V(tc,
 190                  VB->TexCoordPtr[texUnit]->size,
 191                  VB->TexCoordPtr[texUnit]->data[v]);
 192    }
 193
 194    if (VB->IndexPtr)
 195       index = VB->IndexPtr->data[v];
 196    else
 197       index = 0;
 198
 199    gl_feedback_vertex( ctx, win, color, index, tc );
 200 }
 201
 202
 203
 204 /*
 205  * Put triangle in feedback buffer.
 206  */
 207 void gl_feedback_triangle( GLcontext *ctx,
 208                            GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 209 {
 210    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 211       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
 212       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
 213
 214       feedback_vertex( ctx, v0, pv );
 215       feedback_vertex( ctx, v1, pv );
 216       feedback_vertex( ctx, v2, pv );
 217    }
 218 }
 219
 220
 221 void gl_feedback_line( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv )
 222 {
 223    GLenum token = GL_LINE_TOKEN;
 224
 225    if (ctx->StippleCounter==0)
 226       token = GL_LINE_RESET_TOKEN;
 227
 228    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 229
 230    feedback_vertex( ctx, v1, pv );
 231    feedback_vertex( ctx, v2, pv );
 232
 233    ctx->StippleCounter++;
 234 }
 235
 236
 237 void gl_feedback_points( GLcontext *ctx, GLuint first, GLuint last )
 238 {
 239    const struct vertex_buffer *VB = ctx->VB;
 240    GLuint i;
 241
 242    for (i=first;i<=last;i++) {
 243       if (VB->ClipMask[i]==0) {
 244          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 245          feedback_vertex( ctx, i, i );
 246       }
 247    }
 248 }
 249
 250
 251
 252
 253
 254 /**********************************************************************/
 255 /*                              Selection                             */
 256 /**********************************************************************/
 257
 258
 259 /*
 260  * NOTE: this function can't be put in a display list.
 261  */
 262 void
 263 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 264 {
 265    GET_CURRENT_CONTEXT(ctx);
 266    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
 267    if (ctx->RenderMode==GL_SELECT) {
 268       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 269    }
 270    ctx->Select.Buffer = buffer;
 271    ctx->Select.BufferSize = size;
 272    ctx->Select.BufferCount = 0;
 273
 274    ctx->Select.HitFlag = GL_FALSE;
 275    ctx->Select.HitMinZ = 1.0;
 276    ctx->Select.HitMaxZ = 0.0;
 277 }
 278
 279
 280 #define WRITE_RECORD( CTX, V )                                  \
 281         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 282            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 283         }                                                       \
 284         CTX->Select.BufferCount++;
 285
 286
 287
 288 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 289 {
 290    ctx->Select.HitFlag = GL_TRUE;
 291    if (z < ctx->Select.HitMinZ) {
 292       ctx->Select.HitMinZ = z;
 293    }
 294    if (z > ctx->Select.HitMaxZ) {
 295       ctx->Select.HitMaxZ = z;
 296    }
 297 }
 298
 299 void gl_select_triangle( GLcontext *ctx,
 300                          GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 301 {
 302    const struct vertex_buffer *VB = ctx->VB;
 303
 304    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 305       const GLfloat zs = 1.0F / ctx->Visual->DepthMaxF;
 306       gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
 307       gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
 308       gl_update_hitflag( ctx, VB->Win.data[v2][2] * zs );
 309    }
 310 }
 311
 312
 313 void gl_select_line( GLcontext *ctx,
 314                      GLuint v0, GLuint v1, GLuint pv )
 315 {
 316    const struct vertex_buffer *VB = ctx->VB;
 317    const GLfloat zs = 1.0F / ctx->Visual->DepthMaxF;
 318    gl_update_hitflag( ctx, VB->Win.data[v0][2] * zs );
 319    gl_update_hitflag( ctx, VB->Win.data[v1][2] * zs );
 320 }
 321
 322
 323 void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
 324 {
 325    struct vertex_buffer *VB = ctx->VB;
 326    const GLfloat zs = 1.0F / ctx->Visual->DepthMaxF;
 327    GLuint i;
 328
 329    for (i=first;i<=last;i++) {
 330       if (VB->ClipMask[i]==0) {
 331          gl_update_hitflag( ctx, VB->Win.data[i][2] * zs );
 332       }
 333    }
 334 }
 335
 336
 337 static void write_hit_record( GLcontext *ctx )
 338 {
 339    GLuint i;
 340    GLuint zmin, zmax, zscale = (~0u);
 341
 342    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 343    /* 2^32-1 and round to nearest unsigned integer. */
 344
 345    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 346    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 347    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 348
 349    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 350    WRITE_RECORD( ctx, zmin );
 351    WRITE_RECORD( ctx, zmax );
 352    for (i = 0; i < ctx->Select.NameStackDepth; i++) {
 353       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 354    }
 355
 356    ctx->Select.Hits++;
 357    ctx->Select.HitFlag = GL_FALSE;
 358    ctx->Select.HitMinZ = 1.0;
 359    ctx->Select.HitMaxZ = -1.0;
 360 }
 361
 362
 363
 364 void
 365 _mesa_InitNames( void )
 366 {
 367    GET_CURRENT_CONTEXT(ctx);
 368    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 369    /* Record the hit before the HitFlag is wiped out again. */
 370    if (ctx->RenderMode == GL_SELECT) {
 371       if (ctx->Select.HitFlag) {
 372          write_hit_record( ctx );
 373       }
 374    }
 375    ctx->Select.NameStackDepth = 0;
 376    ctx->Select.HitFlag = GL_FALSE;
 377    ctx->Select.HitMinZ = 1.0;
 378    ctx->Select.HitMaxZ = 0.0;
 379 }
 380
 381
 382
 383 void
 384 _mesa_LoadName( GLuint name )
 385 {
 386    GET_CURRENT_CONTEXT(ctx);
 387    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 388    if (ctx->RenderMode != GL_SELECT) {
 389       return;
 390    }
 391    if (ctx->Select.NameStackDepth == 0) {
 392       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 393       return;
 394    }
 395    if (ctx->Select.HitFlag) {
 396       write_hit_record( ctx );
 397    }
 398    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 399       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 400    }
 401    else {
 402       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 403    }
 404 }
 405
 406
 407 void
 408 _mesa_PushName( GLuint name )
 409 {
 410    GET_CURRENT_CONTEXT(ctx);
 411    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
 412    if (ctx->RenderMode != GL_SELECT) {
 413       return;
 414    }
 415    if (ctx->Select.HitFlag) {
 416       write_hit_record( ctx );
 417    }
 418    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 419       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 420    }
 421    else {
 422       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 423    }
 424 }
 425
 426
 427
 428 void
 429 _mesa_PopName( void )
 430 {
 431    GET_CURRENT_CONTEXT(ctx);
 432    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 433    if (ctx->RenderMode != GL_SELECT) {
 434       return;
 435    }
 436    if (ctx->Select.HitFlag) {
 437       write_hit_record( ctx );
 438    }
 439    if (ctx->Select.NameStackDepth > 0) {
 440       ctx->Select.NameStackDepth--;
 441    }
 442    else {
 443       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 444    }
 445 }
 446
 447
 448
 449 /**********************************************************************/
 450 /*                           Render Mode                              */
 451 /**********************************************************************/
 452
 453
 454
 455 /*
 456  * NOTE: this function can't be put in a display list.
 457  */
 458 GLint
 459 _mesa_RenderMode( GLenum mode )
 460 {
 461    GET_CURRENT_CONTEXT(ctx);
 462    GLint result;
 463
 464    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 465
 466    if (MESA_VERBOSE & VERBOSE_API)
 467       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 468
 469    ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 470
 471    switch (ctx->RenderMode) {
 472       case GL_RENDER:
 473          result = 0;
 474          break;
 475       case GL_SELECT:
 476          if (ctx->Select.HitFlag) {
 477             write_hit_record( ctx );
 478          }
 479          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 480             /* overflow */
 481 #ifdef DEBUG
 482             gl_warning(ctx, "Feedback buffer overflow");
 483 #endif
 484             result = -1;
 485          }
 486          else {
 487             result = ctx->Select.Hits;
 488          }
 489          ctx->Select.BufferCount = 0;
 490          ctx->Select.Hits = 0;
 491          ctx->Select.NameStackDepth = 0;
 492          break;
 493       case GL_FEEDBACK:
 494          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 495             /* overflow */
 496             result = -1;
 497          }
 498          else {
 499             result = ctx->Feedback.Count;
 500          }
 501          ctx->Feedback.Count = 0;
 502          break;
 503       default:
 504          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 505          return 0;
 506    }
 507
 508    switch (mode) {
 509       case GL_RENDER:
 510          break;
 511       case GL_SELECT:
 512          ctx->TriangleCaps |= DD_SELECT;
 513          if (ctx->Select.BufferSize==0) {
 514             /* haven't called glSelectBuffer yet */
 515             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 516          }
 517          break;
 518       case GL_FEEDBACK:
 519          ctx->TriangleCaps |= DD_FEEDBACK;
 520          if (ctx->Feedback.BufferSize==0) {
 521             /* haven't called glFeedbackBuffer yet */
 522             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 523          }
 524          break;
 525       default:
 526          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 527          return 0;
 528    }
 529
 530    ctx->RenderMode = mode;
 531    ctx->NewState |= NEW_ALL;
 532
 533    return result;
 534 }
 535