src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.2 1999/09/18 20:41:23 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 #include <assert.h>
  35 #include <stdio.h>
  36 #include "context.h"
  37 #include "enums.h"
  38 #include "feedback.h"
  39 #include "macros.h"
  40 #include "mmath.h"
  41 #include "types.h"
  42 #ifdef XFree86Server
  43 #include "GL/xf86glx.h"
  44 #endif
  45 #endif
  46
  47
  48
  49 #define FB_3D           0x01
  50 #define FB_4D           0x02
  51 #define FB_INDEX        0x04
  52 #define FB_COLOR        0x08
  53 #define FB_TEXTURE      0X10
  54
  55
  56
  57 void
  58 gl_FeedbackBuffer( GLcontext *ctx, GLsizei size, GLenum type, GLfloat *buffer )
  59 {
  60    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glFeedbackBuffer" );
  61
  62    if (ctx->RenderMode==GL_FEEDBACK) {
  63       gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  64       return;
  65    }
  66
  67    if (size<0) {
  68       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  69       return;
  70    }
  71    if (!buffer) {
  72       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  73       ctx->Feedback.BufferSize = 0;
  74       return;
  75    }
  76
  77    switch (type) {
  78       case GL_2D:
  79          ctx->Feedback.Mask = 0;
  80          ctx->Feedback.Type = type;
  81          break;
  82       case GL_3D:
  83          ctx->Feedback.Mask = FB_3D;
  84          ctx->Feedback.Type = type;
  85          break;
  86       case GL_3D_COLOR:
  87          ctx->Feedback.Mask = FB_3D
  88                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX);
  89          ctx->Feedback.Type = type;
  90          break;
  91       case GL_3D_COLOR_TEXTURE:
  92          ctx->Feedback.Mask = FB_3D
  93                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
  94                            | FB_TEXTURE;
  95          ctx->Feedback.Type = type;
  96          break;
  97       case GL_4D_COLOR_TEXTURE:
  98          ctx->Feedback.Mask = FB_3D | FB_4D
  99                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
 100                            | FB_TEXTURE;
 101          ctx->Feedback.Type = type;
 102          break;
 103       default:
 104          ctx->Feedback.Mask = 0;
 105          gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
 106    }
 107
 108    ctx->Feedback.BufferSize = size;
 109    ctx->Feedback.Buffer = buffer;
 110    ctx->Feedback.Count = 0;
 111 }
 112
 113
 114
 115 void gl_PassThrough( GLcontext *ctx, GLfloat token )
 116 {
 117    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
 118
 119    if (ctx->RenderMode==GL_FEEDBACK) {
 120       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 121       FEEDBACK_TOKEN( ctx, token );
 122    }
 123 }
 124
 125
 126
 127 /*
 128  * Put a vertex into the feedback buffer.
 129  */
 130 void gl_feedback_vertex( GLcontext *ctx,
 131                          const GLfloat win[4],
 132                          const GLfloat color[4],
 133                          GLuint index,
 134                          const GLfloat texcoord[4] )
 135 {
 136    FEEDBACK_TOKEN( ctx, win[0] );
 137    FEEDBACK_TOKEN( ctx, win[1] );
 138    if (ctx->Feedback.Mask & FB_3D) {
 139       FEEDBACK_TOKEN( ctx, win[2] );
 140    }
 141    if (ctx->Feedback.Mask & FB_4D) {
 142       FEEDBACK_TOKEN( ctx, win[3] );
 143    }
 144    if (ctx->Feedback.Mask & FB_INDEX) {
 145       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 146    }
 147    if (ctx->Feedback.Mask & FB_COLOR) {
 148       FEEDBACK_TOKEN( ctx, color[0] );
 149       FEEDBACK_TOKEN( ctx, color[1] );
 150       FEEDBACK_TOKEN( ctx, color[2] );
 151       FEEDBACK_TOKEN( ctx, color[3] );
 152    }
 153    if (ctx->Feedback.Mask & FB_TEXTURE) {
 154       FEEDBACK_TOKEN( ctx, texcoord[0] );
 155       FEEDBACK_TOKEN( ctx, texcoord[1] );
 156       FEEDBACK_TOKEN( ctx, texcoord[2] );
 157       FEEDBACK_TOKEN( ctx, texcoord[3] );
 158    }
 159 }
 160
 161
 162
 163 static void gl_do_feedback_vertex( GLcontext *ctx, GLuint v, GLuint pv )
 164 {
 165    GLfloat win[4];
 166    GLfloat color[4];
 167    GLfloat tc[4];
 168    GLuint texUnit = ctx->Texture.CurrentTransformUnit;
 169    struct vertex_buffer *VB = ctx->VB;
 170
 171    win[0] = VB->Win.data[v][0];
 172    win[1] = VB->Win.data[v][1];
 173    win[2] = VB->Win.data[v][2] / DEPTH_SCALE;
 174    win[3] = 1.0 / VB->Win.data[v][3];
 175
 176    if (ctx->Light.ShadeModel==GL_SMOOTH) 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    {
 183       GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
 184       tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
 185       tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
 186       tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
 187       tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
 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    gl_feedback_vertex( ctx, win, color, VB->IndexPtr->data[v], tc );
 196 }
 197
 198
 199
 200 /*
 201  * Put triangle in feedback buffer.
 202  */
 203 void gl_feedback_triangle( GLcontext *ctx,
 204                            GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 205 {
 206    if (gl_cull_triangle( ctx, v0, v1, v2 )) {
 207       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
 208       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
 209
 210       gl_do_feedback_vertex( ctx, v0, pv );
 211       gl_do_feedback_vertex( ctx, v1, pv );
 212       gl_do_feedback_vertex( ctx, v2, pv );
 213    }
 214 }
 215
 216
 217 void gl_feedback_line( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv )
 218 {
 219    GLenum token = GL_LINE_TOKEN;
 220
 221    if (ctx->StippleCounter==0)
 222       token = GL_LINE_RESET_TOKEN;
 223
 224    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 225
 226    gl_do_feedback_vertex( ctx, v1, pv );
 227    gl_do_feedback_vertex( ctx, v2, pv );
 228
 229    ctx->StippleCounter++;
 230 }
 231
 232
 233 void gl_feedback_points( GLcontext *ctx, GLuint first, GLuint last )
 234 {
 235    struct vertex_buffer *VB = ctx->VB;
 236    GLuint i;
 237
 238    for (i=first;i<=last;i++)
 239       if (VB->ClipMask[i]==0) {
 240          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 241          gl_do_feedback_vertex( ctx, i, i );
 242       }
 243 }
 244
 245
 246
 247
 248
 249 /**********************************************************************/
 250 /*                              Selection                             */
 251 /**********************************************************************/
 252
 253
 254 /*
 255  * NOTE: this function can't be put in a display list.
 256  */
 257 void gl_SelectBuffer( GLcontext *ctx, GLsizei size, GLuint *buffer )
 258 {
 259    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
 260    if (ctx->RenderMode==GL_SELECT) {
 261       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 262    }
 263    ctx->Select.Buffer = buffer;
 264    ctx->Select.BufferSize = size;
 265    ctx->Select.BufferCount = 0;
 266
 267    ctx->Select.HitFlag = GL_FALSE;
 268    ctx->Select.HitMinZ = 1.0;
 269    ctx->Select.HitMaxZ = 0.0;
 270 }
 271
 272
 273 #define WRITE_RECORD( CTX, V )                                  \
 274         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 275            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 276         }                                                       \
 277         CTX->Select.BufferCount++;
 278
 279
 280
 281 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 282 {
 283    ctx->Select.HitFlag = GL_TRUE;
 284    if (z < ctx->Select.HitMinZ) {
 285       ctx->Select.HitMinZ = z;
 286    }
 287    if (z > ctx->Select.HitMaxZ) {
 288       ctx->Select.HitMaxZ = z;
 289    }
 290 }
 291
 292 void gl_select_triangle( GLcontext *ctx,
 293                          GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 294 {
 295    struct vertex_buffer *VB = ctx->VB;
 296
 297    if (gl_cull_triangle( ctx, v0, v1, v2 )) {
 298       gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
 299       gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
 300       gl_update_hitflag( ctx, VB->Win.data[v2][3] / DEPTH_SCALE );
 301    }
 302 }
 303
 304
 305 void gl_select_line( GLcontext *ctx,
 306                      GLuint v0, GLuint v1, GLuint pv )
 307 {
 308    struct vertex_buffer *VB = ctx->VB;
 309
 310    gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
 311    gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
 312 }
 313
 314 void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
 315 {
 316    struct vertex_buffer *VB = ctx->VB;
 317    GLuint i;
 318
 319    for (i=first;i<=last;i++)
 320       if (VB->ClipMask[i]==0)
 321          gl_update_hitflag( ctx, VB->Win.data[i][3] / DEPTH_SCALE);
 322 }
 323
 324
 325 static void write_hit_record( GLcontext *ctx )
 326 {
 327    GLuint i;
 328    GLuint zmin, zmax, zscale = (~0u);
 329
 330    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 331    /* 2^32-1 and round to nearest unsigned integer. */
 332
 333    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 334    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 335    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 336
 337    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 338    WRITE_RECORD( ctx, zmin );
 339    WRITE_RECORD( ctx, zmax );
 340    for (i=0;i<ctx->Select.NameStackDepth;i++) {
 341       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 342    }
 343
 344    ctx->Select.Hits++;
 345    ctx->Select.HitFlag = GL_FALSE;
 346    ctx->Select.HitMinZ = 1.0;
 347    ctx->Select.HitMaxZ = -1.0;
 348 }
 349
 350
 351
 352 void gl_InitNames( GLcontext *ctx )
 353 {
 354    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 355    /* Record the hit before the HitFlag is wiped out again. */
 356    if (ctx->RenderMode==GL_SELECT) {
 357       if (ctx->Select.HitFlag) {
 358          write_hit_record( ctx );
 359       }
 360    }
 361    ctx->Select.NameStackDepth = 0;
 362    ctx->Select.HitFlag = GL_FALSE;
 363    ctx->Select.HitMinZ = 1.0;
 364    ctx->Select.HitMaxZ = 0.0;
 365 }
 366
 367
 368
 369 void gl_LoadName( GLcontext *ctx, GLuint name )
 370 {
 371    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 372    if (ctx->RenderMode!=GL_SELECT) {
 373       return;
 374    }
 375    if (ctx->Select.NameStackDepth==0) {
 376       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 377       return;
 378    }
 379    if (ctx->Select.HitFlag) {
 380       write_hit_record( ctx );
 381    }
 382    if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
 383       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 384    }
 385    else {
 386       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 387    }
 388 }
 389
 390
 391 void gl_PushName( GLcontext *ctx, GLuint name )
 392 {
 393    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
 394    if (ctx->RenderMode!=GL_SELECT) {
 395       return;
 396    }
 397    if (ctx->Select.HitFlag) {
 398       write_hit_record( ctx );
 399    }
 400    if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
 401       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 402    }
 403    else {
 404       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 405    }
 406 }
 407
 408
 409
 410 void gl_PopName( GLcontext *ctx )
 411 {
 412    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 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>0) {
 420       ctx->Select.NameStackDepth--;
 421    }
 422    else {
 423       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 424    }
 425 }
 426
 427
 428
 429 /**********************************************************************/
 430 /*                           Render Mode                              */
 431 /**********************************************************************/
 432
 433
 434
 435 /*
 436  * NOTE: this function can't be put in a display list.
 437  */
 438 GLint gl_RenderMode( GLcontext *ctx, GLenum mode )
 439 {
 440    GLint result;
 441
 442    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 443
 444    if (MESA_VERBOSE & VERBOSE_API)
 445       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 446
 447    ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 448
 449    switch (ctx->RenderMode) {
 450       case GL_RENDER:
 451          result = 0;
 452          break;
 453       case GL_SELECT:
 454          if (ctx->Select.HitFlag) {
 455             write_hit_record( ctx );
 456          }
 457          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 458             /* overflow */
 459 #ifdef DEBUG
 460             gl_warning(ctx, "Feedback buffer overflow");
 461 #endif
 462             result = -1;
 463          }
 464          else {
 465             result = ctx->Select.Hits;
 466          }
 467          ctx->Select.BufferCount = 0;
 468          ctx->Select.Hits = 0;
 469          ctx->Select.NameStackDepth = 0;
 470          break;
 471       case GL_FEEDBACK:
 472          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 473             /* overflow */
 474             result = -1;
 475          }
 476          else {
 477             result = ctx->Feedback.Count;
 478          }
 479          ctx->Feedback.Count = 0;
 480          break;
 481       default:
 482          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 483          return 0;
 484    }
 485
 486    switch (mode) {
 487       case GL_RENDER:
 488          break;
 489       case GL_SELECT:
 490          ctx->TriangleCaps |= DD_SELECT;
 491          if (ctx->Select.BufferSize==0) {
 492             /* haven't called glSelectBuffer yet */
 493             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 494          }
 495          break;
 496       case GL_FEEDBACK:
 497          ctx->TriangleCaps |= DD_FEEDBACK;
 498          if (ctx->Feedback.BufferSize==0) {
 499             /* haven't called glFeedbackBuffer yet */
 500             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 501          }
 502          break;
 503       default:
 504          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 505          return 0;
 506    }
 507
 508
 509    ctx->RenderMode = mode;
 510    ctx->NewState |= NEW_ALL;
 511
 512    return result;
 513 }
 514