src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.4 1999/10/08 09:27:10 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.1
   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
  29
  30
  31 #ifdef PC_HEADER
  32 #include "all.h"
  33 #else
  34 #ifndef XFree86Server
  35 #include <assert.h>
  36 #include <stdio.h>
  37 #else
  38 #include "GL/xf86glx.h"
  39 #endif
  40 #include "context.h"
  41 #include "enums.h"
  42 #include "feedback.h"
  43 #include "macros.h"
  44 #include "mmath.h"
  45 #include "types.h"
  46 #include "triangle.h"
  47 #ifdef XFree86Server
  48 #include "GL/xf86glx.h"
  49 #endif
  50 #endif
  51
  52
  53
  54 #define FB_3D           0x01
  55 #define FB_4D           0x02
  56 #define FB_INDEX        0x04
  57 #define FB_COLOR        0x08
  58 #define FB_TEXTURE      0X10
  59
  60
  61
  62 void
  63 gl_FeedbackBuffer( GLcontext *ctx, GLsizei size, GLenum type, GLfloat *buffer )
  64 {
  65    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glFeedbackBuffer" );
  66
  67    if (ctx->RenderMode==GL_FEEDBACK) {
  68       gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  69       return;
  70    }
  71
  72    if (size<0) {
  73       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  74       return;
  75    }
  76    if (!buffer) {
  77       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  78       ctx->Feedback.BufferSize = 0;
  79       return;
  80    }
  81
  82    switch (type) {
  83       case GL_2D:
  84          ctx->Feedback.Mask = 0;
  85          ctx->Feedback.Type = type;
  86          break;
  87       case GL_3D:
  88          ctx->Feedback.Mask = FB_3D;
  89          ctx->Feedback.Type = type;
  90          break;
  91       case GL_3D_COLOR:
  92          ctx->Feedback.Mask = FB_3D
  93                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX);
  94          ctx->Feedback.Type = type;
  95          break;
  96       case GL_3D_COLOR_TEXTURE:
  97          ctx->Feedback.Mask = FB_3D
  98                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
  99                            | FB_TEXTURE;
 100          ctx->Feedback.Type = type;
 101          break;
 102       case GL_4D_COLOR_TEXTURE:
 103          ctx->Feedback.Mask = FB_3D | FB_4D
 104                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
 105                            | FB_TEXTURE;
 106          ctx->Feedback.Type = type;
 107          break;
 108       default:
 109          ctx->Feedback.Mask = 0;
 110          gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
 111    }
 112
 113    ctx->Feedback.BufferSize = size;
 114    ctx->Feedback.Buffer = buffer;
 115    ctx->Feedback.Count = 0;
 116 }
 117
 118
 119
 120 void gl_PassThrough( GLcontext *ctx, GLfloat token )
 121 {
 122    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
 123
 124    if (ctx->RenderMode==GL_FEEDBACK) {
 125       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 126       FEEDBACK_TOKEN( ctx, token );
 127    }
 128 }
 129
 130
 131
 132 /*
 133  * Put a vertex into the feedback buffer.
 134  */
 135 void gl_feedback_vertex( GLcontext *ctx,
 136                          const GLfloat win[4],
 137                          const GLfloat color[4],
 138                          GLuint index,
 139                          const GLfloat texcoord[4] )
 140 {
 141    FEEDBACK_TOKEN( ctx, win[0] );
 142    FEEDBACK_TOKEN( ctx, win[1] );
 143    if (ctx->Feedback.Mask & FB_3D) {
 144       FEEDBACK_TOKEN( ctx, win[2] );
 145    }
 146    if (ctx->Feedback.Mask & FB_4D) {
 147       FEEDBACK_TOKEN( ctx, win[3] );
 148    }
 149    if (ctx->Feedback.Mask & FB_INDEX) {
 150       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 151    }
 152    if (ctx->Feedback.Mask & FB_COLOR) {
 153       FEEDBACK_TOKEN( ctx, color[0] );
 154       FEEDBACK_TOKEN( ctx, color[1] );
 155       FEEDBACK_TOKEN( ctx, color[2] );
 156       FEEDBACK_TOKEN( ctx, color[3] );
 157    }
 158    if (ctx->Feedback.Mask & FB_TEXTURE) {
 159       FEEDBACK_TOKEN( ctx, texcoord[0] );
 160       FEEDBACK_TOKEN( ctx, texcoord[1] );
 161       FEEDBACK_TOKEN( ctx, texcoord[2] );
 162       FEEDBACK_TOKEN( ctx, texcoord[3] );
 163    }
 164 }
 165
 166
 167
 168 static void gl_do_feedback_vertex( GLcontext *ctx, GLuint v, GLuint pv )
 169 {
 170    GLfloat win[4];
 171    GLfloat color[4];
 172    GLfloat tc[4];
 173    GLuint texUnit = ctx->Texture.CurrentTransformUnit;
 174    struct vertex_buffer *VB = ctx->VB;
 175
 176    win[0] = VB->Win.data[v][0];
 177    win[1] = VB->Win.data[v][1];
 178    win[2] = VB->Win.data[v][2] / DEPTH_SCALE;
 179    win[3] = 1.0 / VB->Win.data[v][3];
 180
 181    if (ctx->Light.ShadeModel==GL_SMOOTH) pv = v;
 182
 183    UBYTE_RGBA_TO_FLOAT_RGBA( color, VB->ColorPtr->data[pv] );
 184
 185    if (VB->TexCoordPtr[texUnit]->size == 4 &&
 186        VB->TexCoordPtr[texUnit]->data[v][3]!=0.0)
 187    {
 188       GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
 189       tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
 190       tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
 191       tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
 192       tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
 193    } else {
 194       ASSIGN_4V(tc, 0,0,0,1);
 195       COPY_SZ_4V(tc,
 196                  VB->TexCoordPtr[texUnit]->size,
 197                  VB->TexCoordPtr[texUnit]->data[v]);
 198    }
 199
 200    gl_feedback_vertex( ctx, win, color, VB->IndexPtr->data[v], 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       gl_do_feedback_vertex( ctx, v0, pv );
 216       gl_do_feedback_vertex( ctx, v1, pv );
 217       gl_do_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    gl_do_feedback_vertex( ctx, v1, pv );
 232    gl_do_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    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          gl_do_feedback_vertex( ctx, i, i );
 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 gl_SelectBuffer( GLcontext *ctx, GLsizei size, GLuint *buffer )
 263 {
 264    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
 265    if (ctx->RenderMode==GL_SELECT) {
 266       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 267    }
 268    ctx->Select.Buffer = buffer;
 269    ctx->Select.BufferSize = size;
 270    ctx->Select.BufferCount = 0;
 271
 272    ctx->Select.HitFlag = GL_FALSE;
 273    ctx->Select.HitMinZ = 1.0;
 274    ctx->Select.HitMaxZ = 0.0;
 275 }
 276
 277
 278 #define WRITE_RECORD( CTX, V )                                  \
 279         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 280            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 281         }                                                       \
 282         CTX->Select.BufferCount++;
 283
 284
 285
 286 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 287 {
 288    ctx->Select.HitFlag = GL_TRUE;
 289    if (z < ctx->Select.HitMinZ) {
 290       ctx->Select.HitMinZ = z;
 291    }
 292    if (z > ctx->Select.HitMaxZ) {
 293       ctx->Select.HitMaxZ = z;
 294    }
 295 }
 296
 297 void gl_select_triangle( GLcontext *ctx,
 298                          GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 299 {
 300    struct vertex_buffer *VB = ctx->VB;
 301
 302    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 303       gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
 304       gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
 305       gl_update_hitflag( ctx, VB->Win.data[v2][3] / DEPTH_SCALE );
 306    }
 307 }
 308
 309
 310 void gl_select_line( GLcontext *ctx,
 311                      GLuint v0, GLuint v1, GLuint pv )
 312 {
 313    struct vertex_buffer *VB = ctx->VB;
 314
 315    gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
 316    gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
 317 }
 318
 319 void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
 320 {
 321    struct vertex_buffer *VB = ctx->VB;
 322    GLuint i;
 323
 324    for (i=first;i<=last;i++)
 325       if (VB->ClipMask[i]==0)
 326          gl_update_hitflag( ctx, VB->Win.data[i][3] / DEPTH_SCALE);
 327 }
 328
 329
 330 static void write_hit_record( GLcontext *ctx )
 331 {
 332    GLuint i;
 333    GLuint zmin, zmax, zscale = (~0u);
 334
 335    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 336    /* 2^32-1 and round to nearest unsigned integer. */
 337
 338    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 339    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 340    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 341
 342    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 343    WRITE_RECORD( ctx, zmin );
 344    WRITE_RECORD( ctx, zmax );
 345    for (i=0;i<ctx->Select.NameStackDepth;i++) {
 346       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 347    }
 348
 349    ctx->Select.Hits++;
 350    ctx->Select.HitFlag = GL_FALSE;
 351    ctx->Select.HitMinZ = 1.0;
 352    ctx->Select.HitMaxZ = -1.0;
 353 }
 354
 355
 356
 357 void gl_InitNames( GLcontext *ctx )
 358 {
 359    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 360    /* Record the hit before the HitFlag is wiped out again. */
 361    if (ctx->RenderMode==GL_SELECT) {
 362       if (ctx->Select.HitFlag) {
 363          write_hit_record( ctx );
 364       }
 365    }
 366    ctx->Select.NameStackDepth = 0;
 367    ctx->Select.HitFlag = GL_FALSE;
 368    ctx->Select.HitMinZ = 1.0;
 369    ctx->Select.HitMaxZ = 0.0;
 370 }
 371
 372
 373
 374 void gl_LoadName( GLcontext *ctx, GLuint name )
 375 {
 376    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 377    if (ctx->RenderMode!=GL_SELECT) {
 378       return;
 379    }
 380    if (ctx->Select.NameStackDepth==0) {
 381       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 382       return;
 383    }
 384    if (ctx->Select.HitFlag) {
 385       write_hit_record( ctx );
 386    }
 387    if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
 388       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 389    }
 390    else {
 391       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 392    }
 393 }
 394
 395
 396 void gl_PushName( GLcontext *ctx, GLuint name )
 397 {
 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 gl_PopName( GLcontext *ctx )
 416 {
 417    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 418    if (ctx->RenderMode!=GL_SELECT) {
 419       return;
 420    }
 421    if (ctx->Select.HitFlag) {
 422       write_hit_record( ctx );
 423    }
 424    if (ctx->Select.NameStackDepth>0) {
 425       ctx->Select.NameStackDepth--;
 426    }
 427    else {
 428       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 429    }
 430 }
 431
 432
 433
 434 /**********************************************************************/
 435 /*                           Render Mode                              */
 436 /**********************************************************************/
 437
 438
 439
 440 /*
 441  * NOTE: this function can't be put in a display list.
 442  */
 443 GLint gl_RenderMode( GLcontext *ctx, GLenum mode )
 444 {
 445    GLint result;
 446
 447    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 448
 449    if (MESA_VERBOSE & VERBOSE_API)
 450       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 451
 452    ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 453
 454    switch (ctx->RenderMode) {
 455       case GL_RENDER:
 456          result = 0;
 457          break;
 458       case GL_SELECT:
 459          if (ctx->Select.HitFlag) {
 460             write_hit_record( ctx );
 461          }
 462          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 463             /* overflow */
 464 #ifdef DEBUG
 465             gl_warning(ctx, "Feedback buffer overflow");
 466 #endif
 467             result = -1;
 468          }
 469          else {
 470             result = ctx->Select.Hits;
 471          }
 472          ctx->Select.BufferCount = 0;
 473          ctx->Select.Hits = 0;
 474          ctx->Select.NameStackDepth = 0;
 475          break;
 476       case GL_FEEDBACK:
 477          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 478             /* overflow */
 479             result = -1;
 480          }
 481          else {
 482             result = ctx->Feedback.Count;
 483          }
 484          ctx->Feedback.Count = 0;
 485          break;
 486       default:
 487          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 488          return 0;
 489    }
 490
 491    switch (mode) {
 492       case GL_RENDER:
 493          break;
 494       case GL_SELECT:
 495          ctx->TriangleCaps |= DD_SELECT;
 496          if (ctx->Select.BufferSize==0) {
 497             /* haven't called glSelectBuffer yet */
 498             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 499          }
 500          break;
 501       case GL_FEEDBACK:
 502          ctx->TriangleCaps |= DD_FEEDBACK;
 503          if (ctx->Feedback.BufferSize==0) {
 504             /* haven't called glFeedbackBuffer yet */
 505             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 506          }
 507          break;
 508       default:
 509          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 510          return 0;
 511    }
 512
 513
 514    ctx->RenderMode = mode;
 515    ctx->NewState |= NEW_ALL;
 516
 517    return result;
 518 }
 519