reactos/dll/opengl/mesa/src/mesa/main/feedback.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.5
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 /**
  27  * \file feedback.c
  28  * Selection and feedback modes functions.
  29  */
  30
  31
  32 #include "glheader.h"
  33 #include "colormac.h"
  34 #include "context.h"
  35 #include "enums.h"
  36 #include "feedback.h"
  37 #include "macros.h"
  38 #include "mfeatures.h"
  39 #include "mtypes.h"
  40 #include "main/dispatch.h"
  41
  42
  43 #if FEATURE_feedback
  44
  45
  46 #define FB_3D           0x01
  47 #define FB_4D           0x02
  48 #define FB_COLOR        0x04
  49 #define FB_TEXTURE      0X08
  50
  51
  52
  53 static void GLAPIENTRY
  54 _mesa_FeedbackBuffer( GLsizei size, GLenum type, GLfloat *buffer )
  55 {
  56    GET_CURRENT_CONTEXT(ctx);
  57    ASSERT_OUTSIDE_BEGIN_END(ctx);
  58
  59    if (ctx->RenderMode==GL_FEEDBACK) {
  60       _mesa_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  61       return;
  62    }
  63    if (size<0) {
  64       _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  65       return;
  66    }
  67    if (!buffer && size > 0) {
  68       _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  69       ctx->Feedback.BufferSize = 0;
  70       return;
  71    }
  72
  73    switch (type) {
  74       case GL_2D:
  75          ctx->Feedback._Mask = 0;
  76          break;
  77       case GL_3D:
  78          ctx->Feedback._Mask = FB_3D;
  79          break;
  80       case GL_3D_COLOR:
  81          ctx->Feedback._Mask = (FB_3D | FB_COLOR);
  82          break;
  83       case GL_3D_COLOR_TEXTURE:
  84          ctx->Feedback._Mask = (FB_3D | FB_COLOR | FB_TEXTURE);
  85          break;
  86       case GL_4D_COLOR_TEXTURE:
  87          ctx->Feedback._Mask = (FB_3D | FB_4D | FB_COLOR | FB_TEXTURE);
  88          break;
  89       default:
  90          _mesa_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
  91          return;
  92    }
  93
  94    FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* Always flush */
  95    ctx->Feedback.Type = type;
  96    ctx->Feedback.BufferSize = size;
  97    ctx->Feedback.Buffer = buffer;
  98    ctx->Feedback.Count = 0;                   /* Becaues of this. */
  99 }
 100
 101
 102 static void GLAPIENTRY
 103 _mesa_PassThrough( GLfloat token )
 104 {
 105    GET_CURRENT_CONTEXT(ctx);
 106    ASSERT_OUTSIDE_BEGIN_END(ctx);
 107
 108    if (ctx->RenderMode==GL_FEEDBACK) {
 109       FLUSH_VERTICES(ctx, 0);
 110       _mesa_feedback_token( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 111       _mesa_feedback_token( ctx, token );
 112    }
 113 }
 114
 115
 116 /**
 117  * Put a vertex into the feedback buffer.
 118  */
 119 void
 120 _mesa_feedback_vertex(struct gl_context *ctx,
 121                       const GLfloat win[4],
 122                       const GLfloat color[4],
 123                       const GLfloat texcoord[4])
 124 {
 125    _mesa_feedback_token( ctx, win[0] );
 126    _mesa_feedback_token( ctx, win[1] );
 127    if (ctx->Feedback._Mask & FB_3D) {
 128       _mesa_feedback_token( ctx, win[2] );
 129    }
 130    if (ctx->Feedback._Mask & FB_4D) {
 131       _mesa_feedback_token( ctx, win[3] );
 132    }
 133    if (ctx->Feedback._Mask & FB_COLOR) {
 134       _mesa_feedback_token( ctx, color[0] );
 135       _mesa_feedback_token( ctx, color[1] );
 136       _mesa_feedback_token( ctx, color[2] );
 137       _mesa_feedback_token( ctx, color[3] );
 138    }
 139    if (ctx->Feedback._Mask & FB_TEXTURE) {
 140       _mesa_feedback_token( ctx, texcoord[0] );
 141       _mesa_feedback_token( ctx, texcoord[1] );
 142       _mesa_feedback_token( ctx, texcoord[2] );
 143       _mesa_feedback_token( ctx, texcoord[3] );
 144    }
 145 }
 146
 147
 148 /**********************************************************************/
 149 /** \name Selection */
 150 /*@{*/
 151
 152 /**
 153  * Establish a buffer for selection mode values.
 154  *
 155  * \param size buffer size.
 156  * \param buffer buffer.
 157  *
 158  * \sa glSelectBuffer().
 159  *
 160  * \note this function can't be put in a display list.
 161  *
 162  * Verifies we're not in selection mode, flushes the vertices and initialize
 163  * the fields in __struct gl_contextRec::Select with the given buffer.
 164  */
 165 static void GLAPIENTRY
 166 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 167 {
 168    GET_CURRENT_CONTEXT(ctx);
 169    ASSERT_OUTSIDE_BEGIN_END(ctx);
 170
 171    if (size < 0) {
 172       _mesa_error(ctx, GL_INVALID_VALUE, "glSelectBuffer(size)");
 173       return;
 174    }
 175
 176    if (ctx->RenderMode==GL_SELECT) {
 177       _mesa_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 178       return;                   /* KW: added return */
 179    }
 180
 181    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 182    ctx->Select.Buffer = buffer;
 183    ctx->Select.BufferSize = size;
 184    ctx->Select.BufferCount = 0;
 185    ctx->Select.HitFlag = GL_FALSE;
 186    ctx->Select.HitMinZ = 1.0;
 187    ctx->Select.HitMaxZ = 0.0;
 188 }
 189
 190
 191 /**
 192  * Write a value of a record into the selection buffer.
 193  *
 194  * \param ctx GL context.
 195  * \param value value.
 196  *
 197  * Verifies there is free space in the buffer to write the value and
 198  * increments the pointer.
 199  */
 200 static inline void
 201 write_record(struct gl_context *ctx, GLuint value)
 202 {
 203    if (ctx->Select.BufferCount < ctx->Select.BufferSize) {
 204       ctx->Select.Buffer[ctx->Select.BufferCount] = value;
 205    }
 206    ctx->Select.BufferCount++;
 207 }
 208
 209
 210 /**
 211  * Update the hit flag and the maximum and minimum depth values.
 212  *
 213  * \param ctx GL context.
 214  * \param z depth.
 215  *
 216  * Sets gl_selection::HitFlag and updates gl_selection::HitMinZ and
 217  * gl_selection::HitMaxZ.
 218  */
 219 void
 220 _mesa_update_hitflag(struct gl_context *ctx, GLfloat z)
 221 {
 222    ctx->Select.HitFlag = GL_TRUE;
 223    if (z < ctx->Select.HitMinZ) {
 224       ctx->Select.HitMinZ = z;
 225    }
 226    if (z > ctx->Select.HitMaxZ) {
 227       ctx->Select.HitMaxZ = z;
 228    }
 229 }
 230
 231
 232 /**
 233  * Write the hit record.
 234  *
 235  * \param ctx GL context.
 236  *
 237  * Write the hit record, i.e., the number of names in the stack, the minimum and
 238  * maximum depth values and the number of names in the name stack at the time
 239  * of the event. Resets the hit flag.
 240  *
 241  * \sa gl_selection.
 242  */
 243 static void
 244 write_hit_record(struct gl_context *ctx)
 245 {
 246    GLuint i;
 247    GLuint zmin, zmax, zscale = (~0u);
 248
 249    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 250    /* 2^32-1 and round to nearest unsigned integer. */
 251
 252    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 253    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 254    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 255
 256    write_record( ctx, ctx->Select.NameStackDepth );
 257    write_record( ctx, zmin );
 258    write_record( ctx, zmax );
 259    for (i = 0; i < ctx->Select.NameStackDepth; i++) {
 260       write_record( ctx, ctx->Select.NameStack[i] );
 261    }
 262
 263    ctx->Select.Hits++;
 264    ctx->Select.HitFlag = GL_FALSE;
 265    ctx->Select.HitMinZ = 1.0;
 266    ctx->Select.HitMaxZ = -1.0;
 267 }
 268
 269
 270 /**
 271  * Initialize the name stack.
 272  *
 273  * Verifies we are in select mode and resets the name stack depth and resets
 274  * the hit record data in gl_selection. Marks new render mode in
 275  * __struct gl_contextRec::NewState.
 276  */
 277 static void GLAPIENTRY
 278 _mesa_InitNames( void )
 279 {
 280    GET_CURRENT_CONTEXT(ctx);
 281    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 282
 283    /* Record the hit before the HitFlag is wiped out again. */
 284    if (ctx->RenderMode == GL_SELECT) {
 285       if (ctx->Select.HitFlag) {
 286          write_hit_record( ctx );
 287       }
 288    }
 289    ctx->Select.NameStackDepth = 0;
 290    ctx->Select.HitFlag = GL_FALSE;
 291    ctx->Select.HitMinZ = 1.0;
 292    ctx->Select.HitMaxZ = 0.0;
 293    ctx->NewState |= _NEW_RENDERMODE;
 294 }
 295
 296
 297 /**
 298  * Load the top-most name of the name stack.
 299  *
 300  * \param name name.
 301  *
 302  * Verifies we are in selection mode and that the name stack is not empty.
 303  * Flushes vertices. If there is a hit flag writes it (via write_hit_record()),
 304  * and replace the top-most name in the stack.
 305  *
 306  * sa __struct gl_contextRec::Select.
 307  */
 308 static void GLAPIENTRY
 309 _mesa_LoadName( GLuint name )
 310 {
 311    GET_CURRENT_CONTEXT(ctx);
 312    ASSERT_OUTSIDE_BEGIN_END(ctx);
 313
 314    if (ctx->RenderMode != GL_SELECT) {
 315       return;
 316    }
 317    if (ctx->Select.NameStackDepth == 0) {
 318       _mesa_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 319       return;
 320    }
 321
 322    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 323
 324    if (ctx->Select.HitFlag) {
 325       write_hit_record( ctx );
 326    }
 327    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 328       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 329    }
 330    else {
 331       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 332    }
 333 }
 334
 335
 336 /**
 337  * Push a name into the name stack.
 338  *
 339  * \param name name.
 340  *
 341  * Verifies we are in selection mode and that the name stack is not full.
 342  * Flushes vertices. If there is a hit flag writes it (via write_hit_record()),
 343  * and adds the name to the top of the name stack.
 344  *
 345  * sa __struct gl_contextRec::Select.
 346  */
 347 static void GLAPIENTRY
 348 _mesa_PushName( GLuint name )
 349 {
 350    GET_CURRENT_CONTEXT(ctx);
 351    ASSERT_OUTSIDE_BEGIN_END(ctx);
 352
 353    if (ctx->RenderMode != GL_SELECT) {
 354       return;
 355    }
 356
 357    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 358    if (ctx->Select.HitFlag) {
 359       write_hit_record( ctx );
 360    }
 361    if (ctx->Select.NameStackDepth >= MAX_NAME_STACK_DEPTH) {
 362       _mesa_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 363    }
 364    else
 365       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 366 }
 367
 368
 369 /**
 370  * Pop a name into the name stack.
 371  *
 372  * Verifies we are in selection mode and that the name stack is not empty.
 373  * Flushes vertices. If there is a hit flag writes it (via write_hit_record()),
 374  * and removes top-most name in the name stack.
 375  *
 376  * sa __struct gl_contextRec::Select.
 377  */
 378 static void GLAPIENTRY
 379 _mesa_PopName( void )
 380 {
 381    GET_CURRENT_CONTEXT(ctx);
 382    ASSERT_OUTSIDE_BEGIN_END(ctx);
 383
 384    if (ctx->RenderMode != GL_SELECT) {
 385       return;
 386    }
 387
 388    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 389    if (ctx->Select.HitFlag) {
 390       write_hit_record( ctx );
 391    }
 392    if (ctx->Select.NameStackDepth == 0) {
 393       _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 394    }
 395    else
 396       ctx->Select.NameStackDepth--;
 397 }
 398
 399 /*@}*/
 400
 401
 402 /**********************************************************************/
 403 /** \name Render Mode */
 404 /*@{*/
 405
 406 /**
 407  * Set rasterization mode.
 408  *
 409  * \param mode rasterization mode.
 410  *
 411  * \note this function can't be put in a display list.
 412  *
 413  * \sa glRenderMode().
 414  *
 415  * Flushes the vertices and do the necessary cleanup according to the previous
 416  * rasterization mode, such as writing the hit record or resent the select
 417  * buffer index when exiting the select mode. Updates
 418  * __struct gl_contextRec::RenderMode and notifies the driver via the
 419  * dd_function_table::RenderMode callback.
 420  */
 421 GLint GLAPIENTRY
 422 _mesa_RenderMode( GLenum mode )
 423 {
 424    GET_CURRENT_CONTEXT(ctx);
 425    GLint result;
 426    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
 427
 428    if (MESA_VERBOSE & VERBOSE_API)
 429       _mesa_debug(ctx, "glRenderMode %s\n", _mesa_lookup_enum_by_nr(mode));
 430
 431    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 432
 433    switch (ctx->RenderMode) {
 434       case GL_RENDER:
 435          result = 0;
 436          break;
 437       case GL_SELECT:
 438          if (ctx->Select.HitFlag) {
 439             write_hit_record( ctx );
 440          }
 441          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 442             /* overflow */
 443 #ifdef DEBUG
 444             _mesa_warning(ctx, "Feedback buffer overflow");
 445 #endif
 446             result = -1;
 447          }
 448          else {
 449             result = ctx->Select.Hits;
 450          }
 451          ctx->Select.BufferCount = 0;
 452          ctx->Select.Hits = 0;
 453          ctx->Select.NameStackDepth = 0;
 454          break;
 455 #if _HAVE_FULL_GL
 456       case GL_FEEDBACK:
 457          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 458             /* overflow */
 459             result = -1;
 460          }
 461          else {
 462             result = ctx->Feedback.Count;
 463          }
 464          ctx->Feedback.Count = 0;
 465          break;
 466 #endif
 467       default:
 468          _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 469          return 0;
 470    }
 471
 472    switch (mode) {
 473       case GL_RENDER:
 474          break;
 475       case GL_SELECT:
 476          if (ctx->Select.BufferSize==0) {
 477             /* haven't called glSelectBuffer yet */
 478             _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 479          }
 480          break;
 481 #if _HAVE_FULL_GL
 482       case GL_FEEDBACK:
 483          if (ctx->Feedback.BufferSize==0) {
 484             /* haven't called glFeedbackBuffer yet */
 485             _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 486          }
 487          break;
 488 #endif
 489       default:
 490          _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 491          return 0;
 492    }
 493
 494    ctx->RenderMode = mode;
 495    if (ctx->Driver.RenderMode)
 496       ctx->Driver.RenderMode( ctx, mode );
 497
 498    return result;
 499 }
 500
 501 /*@}*/
 502
 503
 504 void
 505 _mesa_init_feedback_dispatch(struct _glapi_table *disp)
 506 {
 507    SET_InitNames(disp, _mesa_InitNames);
 508    SET_FeedbackBuffer(disp, _mesa_FeedbackBuffer);
 509    SET_LoadName(disp, _mesa_LoadName);
 510    SET_PassThrough(disp, _mesa_PassThrough);
 511    SET_PopName(disp, _mesa_PopName);
 512    SET_PushName(disp, _mesa_PushName);
 513    SET_SelectBuffer(disp, _mesa_SelectBuffer);
 514    SET_RenderMode(disp, _mesa_RenderMode);
 515 }
 516
 517
 518 #endif /* FEATURE_feedback */
 519
 520
 521 /**********************************************************************/
 522 /** \name Initialization */
 523 /*@{*/
 524
 525 /**
 526  * Initialize context feedback data.
 527  */
 528 void _mesa_init_feedback( struct gl_context * ctx )
 529 {
 530    /* Feedback */
 531    ctx->Feedback.Type = GL_2D;   /* TODO: verify */
 532    ctx->Feedback.Buffer = NULL;
 533    ctx->Feedback.BufferSize = 0;
 534    ctx->Feedback.Count = 0;
 535
 536    /* Selection/picking */
 537    ctx->Select.Buffer = NULL;
 538    ctx->Select.BufferSize = 0;
 539    ctx->Select.BufferCount = 0;
 540    ctx->Select.Hits = 0;
 541    ctx->Select.NameStackDepth = 0;
 542
 543    /* Miscellaneous */
 544    ctx->RenderMode = GL_RENDER;
 545 }
 546
 547 /*@}*/