src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.5 1999/11/08 07:36:44 brianp 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 #endif
  48
  49
  50
  51 #define FB_3D           0x01
  52 #define FB_4D           0x02
  53 #define FB_INDEX        0x04
  54 #define FB_COLOR        0x08
  55 #define FB_TEXTURE      0X10
  56
  57
  58
  59 void
  60 gl_FeedbackBuffer( GLcontext *ctx, GLsizei size, GLenum type, GLfloat *buffer )
  61 {
  62    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glFeedbackBuffer" );
  63
  64    if (ctx->RenderMode==GL_FEEDBACK) {
  65       gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  66       return;
  67    }
  68
  69    if (size<0) {
  70       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  71       return;
  72    }
  73    if (!buffer) {
  74       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  75       ctx->Feedback.BufferSize = 0;
  76       return;
  77    }
  78
  79    switch (type) {
  80       case GL_2D:
  81          ctx->Feedback.Mask = 0;
  82          ctx->Feedback.Type = type;
  83          break;
  84       case GL_3D:
  85          ctx->Feedback.Mask = FB_3D;
  86          ctx->Feedback.Type = type;
  87          break;
  88       case GL_3D_COLOR:
  89          ctx->Feedback.Mask = FB_3D
  90                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX);
  91          ctx->Feedback.Type = type;
  92          break;
  93       case GL_3D_COLOR_TEXTURE:
  94          ctx->Feedback.Mask = FB_3D
  95                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
  96                            | FB_TEXTURE;
  97          ctx->Feedback.Type = type;
  98          break;
  99       case GL_4D_COLOR_TEXTURE:
 100          ctx->Feedback.Mask = FB_3D | FB_4D
 101                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
 102                            | FB_TEXTURE;
 103          ctx->Feedback.Type = type;
 104          break;
 105       default:
 106          ctx->Feedback.Mask = 0;
 107          gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
 108    }
 109
 110    ctx->Feedback.BufferSize = size;
 111    ctx->Feedback.Buffer = buffer;
 112    ctx->Feedback.Count = 0;
 113 }
 114
 115
 116
 117 void gl_PassThrough( GLcontext *ctx, GLfloat token )
 118 {
 119    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
 120
 121    if (ctx->RenderMode==GL_FEEDBACK) {
 122       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 123       FEEDBACK_TOKEN( ctx, token );
 124    }
 125 }
 126
 127
 128
 129 /*
 130  * Put a vertex into the feedback buffer.
 131  */
 132 void gl_feedback_vertex( GLcontext *ctx,
 133                          const GLfloat win[4],
 134                          const GLfloat color[4],
 135                          GLuint index,
 136                          const GLfloat texcoord[4] )
 137 {
 138    FEEDBACK_TOKEN( ctx, win[0] );
 139    FEEDBACK_TOKEN( ctx, win[1] );
 140    if (ctx->Feedback.Mask & FB_3D) {
 141       FEEDBACK_TOKEN( ctx, win[2] );
 142    }
 143    if (ctx->Feedback.Mask & FB_4D) {
 144       FEEDBACK_TOKEN( ctx, win[3] );
 145    }
 146    if (ctx->Feedback.Mask & FB_INDEX) {
 147       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 148    }
 149    if (ctx->Feedback.Mask & FB_COLOR) {
 150       FEEDBACK_TOKEN( ctx, color[0] );
 151       FEEDBACK_TOKEN( ctx, color[1] );
 152       FEEDBACK_TOKEN( ctx, color[2] );
 153       FEEDBACK_TOKEN( ctx, color[3] );
 154    }
 155    if (ctx->Feedback.Mask & FB_TEXTURE) {
 156       FEEDBACK_TOKEN( ctx, texcoord[0] );
 157       FEEDBACK_TOKEN( ctx, texcoord[1] );
 158       FEEDBACK_TOKEN( ctx, texcoord[2] );
 159       FEEDBACK_TOKEN( ctx, texcoord[3] );
 160    }
 161 }
 162
 163
 164
 165 static void gl_do_feedback_vertex( GLcontext *ctx, GLuint v, GLuint pv )
 166 {
 167    GLfloat win[4];
 168    GLfloat color[4];
 169    GLfloat tc[4];
 170    GLuint texUnit = ctx->Texture.CurrentTransformUnit;
 171    struct vertex_buffer *VB = ctx->VB;
 172
 173    win[0] = VB->Win.data[v][0];
 174    win[1] = VB->Win.data[v][1];
 175    win[2] = VB->Win.data[v][2] / DEPTH_SCALE;
 176    win[3] = 1.0 / VB->Win.data[v][3];
 177
 178    if (ctx->Light.ShadeModel==GL_SMOOTH) pv = v;
 179
 180    UBYTE_RGBA_TO_FLOAT_RGBA( color, VB->ColorPtr->data[pv] );
 181
 182    if (VB->TexCoordPtr[texUnit]->size == 4 &&
 183        VB->TexCoordPtr[texUnit]->data[v][3]!=0.0)
 184    {
 185       GLfloat invq = 1.0F / VB->TexCoordPtr[texUnit]->data[v][3];
 186       tc[0] = VB->TexCoordPtr[texUnit]->data[v][0] * invq;
 187       tc[1] = VB->TexCoordPtr[texUnit]->data[v][1] * invq;
 188       tc[2] = VB->TexCoordPtr[texUnit]->data[v][2] * invq;
 189       tc[3] = VB->TexCoordPtr[texUnit]->data[v][3];
 190    } else {
 191       ASSIGN_4V(tc, 0,0,0,1);
 192       COPY_SZ_4V(tc,
 193                  VB->TexCoordPtr[texUnit]->size,
 194                  VB->TexCoordPtr[texUnit]->data[v]);
 195    }
 196
 197    gl_feedback_vertex( ctx, win, color, VB->IndexPtr->data[v], tc );
 198 }
 199
 200
 201
 202 /*
 203  * Put triangle in feedback buffer.
 204  */
 205 void gl_feedback_triangle( GLcontext *ctx,
 206                            GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 207 {
 208    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 209       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POLYGON_TOKEN );
 210       FEEDBACK_TOKEN( ctx, (GLfloat) 3 );        /* three vertices */
 211
 212       gl_do_feedback_vertex( ctx, v0, pv );
 213       gl_do_feedback_vertex( ctx, v1, pv );
 214       gl_do_feedback_vertex( ctx, v2, pv );
 215    }
 216 }
 217
 218
 219 void gl_feedback_line( GLcontext *ctx, GLuint v1, GLuint v2, GLuint pv )
 220 {
 221    GLenum token = GL_LINE_TOKEN;
 222
 223    if (ctx->StippleCounter==0)
 224       token = GL_LINE_RESET_TOKEN;
 225
 226    FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) token );
 227
 228    gl_do_feedback_vertex( ctx, v1, pv );
 229    gl_do_feedback_vertex( ctx, v2, pv );
 230
 231    ctx->StippleCounter++;
 232 }
 233
 234
 235 void gl_feedback_points( GLcontext *ctx, GLuint first, GLuint last )
 236 {
 237    struct vertex_buffer *VB = ctx->VB;
 238    GLuint i;
 239
 240    for (i=first;i<=last;i++)
 241       if (VB->ClipMask[i]==0) {
 242          FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_POINT_TOKEN );
 243          gl_do_feedback_vertex( ctx, i, i );
 244       }
 245 }
 246
 247
 248
 249
 250
 251 /**********************************************************************/
 252 /*                              Selection                             */
 253 /**********************************************************************/
 254
 255
 256 /*
 257  * NOTE: this function can't be put in a display list.
 258  */
 259 void gl_SelectBuffer( GLcontext *ctx, GLsizei size, GLuint *buffer )
 260 {
 261    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
 262    if (ctx->RenderMode==GL_SELECT) {
 263       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 264    }
 265    ctx->Select.Buffer = buffer;
 266    ctx->Select.BufferSize = size;
 267    ctx->Select.BufferCount = 0;
 268
 269    ctx->Select.HitFlag = GL_FALSE;
 270    ctx->Select.HitMinZ = 1.0;
 271    ctx->Select.HitMaxZ = 0.0;
 272 }
 273
 274
 275 #define WRITE_RECORD( CTX, V )                                  \
 276         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 277            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 278         }                                                       \
 279         CTX->Select.BufferCount++;
 280
 281
 282
 283 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 284 {
 285    ctx->Select.HitFlag = GL_TRUE;
 286    if (z < ctx->Select.HitMinZ) {
 287       ctx->Select.HitMinZ = z;
 288    }
 289    if (z > ctx->Select.HitMaxZ) {
 290       ctx->Select.HitMaxZ = z;
 291    }
 292 }
 293
 294 void gl_select_triangle( GLcontext *ctx,
 295                          GLuint v0, GLuint v1, GLuint v2, GLuint pv )
 296 {
 297    struct vertex_buffer *VB = ctx->VB;
 298
 299    if (gl_cull_triangle( ctx, v0, v1, v2, 0 )) {
 300       gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
 301       gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
 302       gl_update_hitflag( ctx, VB->Win.data[v2][3] / DEPTH_SCALE );
 303    }
 304 }
 305
 306
 307 void gl_select_line( GLcontext *ctx,
 308                      GLuint v0, GLuint v1, GLuint pv )
 309 {
 310    struct vertex_buffer *VB = ctx->VB;
 311
 312    gl_update_hitflag( ctx, VB->Win.data[v0][3] / DEPTH_SCALE );
 313    gl_update_hitflag( ctx, VB->Win.data[v1][3] / DEPTH_SCALE );
 314 }
 315
 316 void gl_select_points( GLcontext *ctx, GLuint first, GLuint last )
 317 {
 318    struct vertex_buffer *VB = ctx->VB;
 319    GLuint i;
 320
 321    for (i=first;i<=last;i++)
 322       if (VB->ClipMask[i]==0)
 323          gl_update_hitflag( ctx, VB->Win.data[i][3] / DEPTH_SCALE);
 324 }
 325
 326
 327 static void write_hit_record( GLcontext *ctx )
 328 {
 329    GLuint i;
 330    GLuint zmin, zmax, zscale = (~0u);
 331
 332    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 333    /* 2^32-1 and round to nearest unsigned integer. */
 334
 335    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 336    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 337    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 338
 339    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 340    WRITE_RECORD( ctx, zmin );
 341    WRITE_RECORD( ctx, zmax );
 342    for (i=0;i<ctx->Select.NameStackDepth;i++) {
 343       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 344    }
 345
 346    ctx->Select.Hits++;
 347    ctx->Select.HitFlag = GL_FALSE;
 348    ctx->Select.HitMinZ = 1.0;
 349    ctx->Select.HitMaxZ = -1.0;
 350 }
 351
 352
 353
 354 void gl_InitNames( GLcontext *ctx )
 355 {
 356    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 357    /* Record the hit before the HitFlag is wiped out again. */
 358    if (ctx->RenderMode==GL_SELECT) {
 359       if (ctx->Select.HitFlag) {
 360          write_hit_record( ctx );
 361       }
 362    }
 363    ctx->Select.NameStackDepth = 0;
 364    ctx->Select.HitFlag = GL_FALSE;
 365    ctx->Select.HitMinZ = 1.0;
 366    ctx->Select.HitMaxZ = 0.0;
 367 }
 368
 369
 370
 371 void gl_LoadName( GLcontext *ctx, GLuint name )
 372 {
 373    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 374    if (ctx->RenderMode!=GL_SELECT) {
 375       return;
 376    }
 377    if (ctx->Select.NameStackDepth==0) {
 378       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 379       return;
 380    }
 381    if (ctx->Select.HitFlag) {
 382       write_hit_record( ctx );
 383    }
 384    if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
 385       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 386    }
 387    else {
 388       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 389    }
 390 }
 391
 392
 393 void gl_PushName( GLcontext *ctx, GLuint name )
 394 {
 395    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
 396    if (ctx->RenderMode!=GL_SELECT) {
 397       return;
 398    }
 399    if (ctx->Select.HitFlag) {
 400       write_hit_record( ctx );
 401    }
 402    if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
 403       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 404    }
 405    else {
 406       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 407    }
 408 }
 409
 410
 411
 412 void gl_PopName( GLcontext *ctx )
 413 {
 414    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 415    if (ctx->RenderMode!=GL_SELECT) {
 416       return;
 417    }
 418    if (ctx->Select.HitFlag) {
 419       write_hit_record( ctx );
 420    }
 421    if (ctx->Select.NameStackDepth>0) {
 422       ctx->Select.NameStackDepth--;
 423    }
 424    else {
 425       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 426    }
 427 }
 428
 429
 430
 431 /**********************************************************************/
 432 /*                           Render Mode                              */
 433 /**********************************************************************/
 434
 435
 436
 437 /*
 438  * NOTE: this function can't be put in a display list.
 439  */
 440 GLint gl_RenderMode( GLcontext *ctx, GLenum mode )
 441 {
 442    GLint result;
 443
 444    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 445
 446    if (MESA_VERBOSE & VERBOSE_API)
 447       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 448
 449    ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 450
 451    switch (ctx->RenderMode) {
 452       case GL_RENDER:
 453          result = 0;
 454          break;
 455       case GL_SELECT:
 456          if (ctx->Select.HitFlag) {
 457             write_hit_record( ctx );
 458          }
 459          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 460             /* overflow */
 461 #ifdef DEBUG
 462             gl_warning(ctx, "Feedback buffer overflow");
 463 #endif
 464             result = -1;
 465          }
 466          else {
 467             result = ctx->Select.Hits;
 468          }
 469          ctx->Select.BufferCount = 0;
 470          ctx->Select.Hits = 0;
 471          ctx->Select.NameStackDepth = 0;
 472          break;
 473       case GL_FEEDBACK:
 474          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 475             /* overflow */
 476             result = -1;
 477          }
 478          else {
 479             result = ctx->Feedback.Count;
 480          }
 481          ctx->Feedback.Count = 0;
 482          break;
 483       default:
 484          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 485          return 0;
 486    }
 487
 488    switch (mode) {
 489       case GL_RENDER:
 490          break;
 491       case GL_SELECT:
 492          ctx->TriangleCaps |= DD_SELECT;
 493          if (ctx->Select.BufferSize==0) {
 494             /* haven't called glSelectBuffer yet */
 495             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 496          }
 497          break;
 498       case GL_FEEDBACK:
 499          ctx->TriangleCaps |= DD_FEEDBACK;
 500          if (ctx->Feedback.BufferSize==0) {
 501             /* haven't called glFeedbackBuffer yet */
 502             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 503          }
 504          break;
 505       default:
 506          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 507          return 0;
 508    }
 509
 510
 511    ctx->RenderMode = mode;
 512    ctx->NewState |= NEW_ALL;
 513
 514    return result;
 515 }
 516