src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.23 2001/03/12 00:48:37 gareth Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  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 "colormac.h"
  33 #include "context.h"
  34 #include "enums.h"
  35 #include "feedback.h"
  36 #include "macros.h"
  37 #include "mmath.h"
  38 #include "mtypes.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(ctx);
  56
  57    if (ctx->RenderMode==GL_FEEDBACK) {
  58       _mesa_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  59       return;
  60    }
  61    if (size<0) {
  62       _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  63       return;
  64    }
  65    if (!buffer) {
  66       _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  67       ctx->Feedback.BufferSize = 0;
  68       return;
  69    }
  70
  71    switch (type) {
  72       case GL_2D:
  73          ctx->Feedback._Mask = 0;
  74          break;
  75       case GL_3D:
  76          ctx->Feedback._Mask = FB_3D;
  77          break;
  78       case GL_3D_COLOR:
  79          ctx->Feedback._Mask = (FB_3D |
  80                                 (ctx->Visual.rgbMode ? FB_COLOR : FB_INDEX));
  81          break;
  82       case GL_3D_COLOR_TEXTURE:
  83          ctx->Feedback._Mask = (FB_3D |
  84                                 (ctx->Visual.rgbMode ? FB_COLOR : FB_INDEX) |
  85                                 FB_TEXTURE);
  86          break;
  87       case GL_4D_COLOR_TEXTURE:
  88          ctx->Feedback._Mask = (FB_3D | FB_4D |
  89                                 (ctx->Visual.rgbMode ? FB_COLOR : FB_INDEX) |
  90                                 FB_TEXTURE);
  91          break;
  92       default:
  93          _mesa_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
  94          return;
  95    }
  96
  97    FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* Always flush */
  98    ctx->Feedback.Type = type;
  99    ctx->Feedback.BufferSize = size;
 100    ctx->Feedback.Buffer = buffer;
 101    ctx->Feedback.Count = 0;                   /* Becaues of this. */
 102 }
 103
 104
 105 void
 106 _mesa_PassThrough( GLfloat token )
 107 {
 108    GET_CURRENT_CONTEXT(ctx);
 109    ASSERT_OUTSIDE_BEGIN_END(ctx);
 110
 111    if (ctx->RenderMode==GL_FEEDBACK) {
 112       FLUSH_VERTICES(ctx, 0);
 113       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 114       FEEDBACK_TOKEN( ctx, token );
 115    }
 116 }
 117
 118
 119
 120 /*
 121  * Put a vertex into the feedback buffer.
 122  */
 123 void _mesa_feedback_vertex( GLcontext *ctx,
 124                          const GLfloat win[4],
 125                          const GLfloat color[4],
 126                          GLuint index,
 127                          const GLfloat texcoord[4] )
 128 {
 129    FEEDBACK_TOKEN( ctx, win[0] );
 130    FEEDBACK_TOKEN( ctx, win[1] );
 131    if (ctx->Feedback._Mask & FB_3D) {
 132       FEEDBACK_TOKEN( ctx, win[2] );
 133    }
 134    if (ctx->Feedback._Mask & FB_4D) {
 135       FEEDBACK_TOKEN( ctx, win[3] );
 136    }
 137    if (ctx->Feedback._Mask & FB_INDEX) {
 138       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 139    }
 140    if (ctx->Feedback._Mask & FB_COLOR) {
 141       FEEDBACK_TOKEN( ctx, color[0] );
 142       FEEDBACK_TOKEN( ctx, color[1] );
 143       FEEDBACK_TOKEN( ctx, color[2] );
 144       FEEDBACK_TOKEN( ctx, color[3] );
 145    }
 146    if (ctx->Feedback._Mask & FB_TEXTURE) {
 147       FEEDBACK_TOKEN( ctx, texcoord[0] );
 148       FEEDBACK_TOKEN( ctx, texcoord[1] );
 149       FEEDBACK_TOKEN( ctx, texcoord[2] );
 150       FEEDBACK_TOKEN( ctx, texcoord[3] );
 151    }
 152 }
 153
 154
 155 /**********************************************************************/
 156 /*                              Selection                             */
 157 /**********************************************************************/
 158
 159
 160 /*
 161  * NOTE: this function can't be put in a display list.
 162  */
 163 void
 164 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 165 {
 166    GET_CURRENT_CONTEXT(ctx);
 167    ASSERT_OUTSIDE_BEGIN_END(ctx);
 168
 169    if (ctx->RenderMode==GL_SELECT) {
 170       _mesa_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 171       return;                   /* KW: added return */
 172    }
 173
 174    FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* why bother? */
 175    ctx->Select.Buffer = buffer;
 176    ctx->Select.BufferSize = size;
 177    ctx->Select.BufferCount = 0;
 178    ctx->Select.HitFlag = GL_FALSE;
 179    ctx->Select.HitMinZ = 1.0;
 180    ctx->Select.HitMaxZ = 0.0;
 181 }
 182
 183
 184 #define WRITE_RECORD( CTX, V )                                  \
 185         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 186            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 187         }                                                       \
 188         CTX->Select.BufferCount++;
 189
 190
 191
 192 void _mesa_update_hitflag( GLcontext *ctx, GLfloat z )
 193 {
 194    ctx->Select.HitFlag = GL_TRUE;
 195    if (z < ctx->Select.HitMinZ) {
 196       ctx->Select.HitMinZ = z;
 197    }
 198    if (z > ctx->Select.HitMaxZ) {
 199       ctx->Select.HitMaxZ = z;
 200    }
 201 }
 202
 203
 204 static void write_hit_record( GLcontext *ctx )
 205 {
 206    GLuint i;
 207    GLuint zmin, zmax, zscale = (~0u);
 208
 209    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 210    /* 2^32-1 and round to nearest unsigned integer. */
 211
 212    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 213    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 214    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 215
 216    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 217    WRITE_RECORD( ctx, zmin );
 218    WRITE_RECORD( ctx, zmax );
 219    for (i = 0; i < ctx->Select.NameStackDepth; i++) {
 220       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 221    }
 222
 223    ctx->Select.Hits++;
 224    ctx->Select.HitFlag = GL_FALSE;
 225    ctx->Select.HitMinZ = 1.0;
 226    ctx->Select.HitMaxZ = -1.0;
 227 }
 228
 229
 230
 231 void
 232 _mesa_InitNames( void )
 233 {
 234    GET_CURRENT_CONTEXT(ctx);
 235    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 236
 237    /* Record the hit before the HitFlag is wiped out again. */
 238    if (ctx->RenderMode == GL_SELECT) {
 239       if (ctx->Select.HitFlag) {
 240          write_hit_record( ctx );
 241       }
 242    }
 243    ctx->Select.NameStackDepth = 0;
 244    ctx->Select.HitFlag = GL_FALSE;
 245    ctx->Select.HitMinZ = 1.0;
 246    ctx->Select.HitMaxZ = 0.0;
 247    ctx->NewState |= _NEW_RENDERMODE;
 248 }
 249
 250
 251
 252 void
 253 _mesa_LoadName( GLuint name )
 254 {
 255    GET_CURRENT_CONTEXT(ctx);
 256    ASSERT_OUTSIDE_BEGIN_END(ctx);
 257
 258    if (ctx->RenderMode != GL_SELECT) {
 259       return;
 260    }
 261    if (ctx->Select.NameStackDepth == 0) {
 262       _mesa_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 263       return;
 264    }
 265
 266    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 267
 268    if (ctx->Select.HitFlag) {
 269       write_hit_record( ctx );
 270    }
 271    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 272       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 273    }
 274    else {
 275       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 276    }
 277 }
 278
 279
 280 void
 281 _mesa_PushName( GLuint name )
 282 {
 283    GET_CURRENT_CONTEXT(ctx);
 284    ASSERT_OUTSIDE_BEGIN_END(ctx);
 285
 286    if (ctx->RenderMode != GL_SELECT) {
 287       return;
 288    }
 289
 290    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 291    if (ctx->Select.HitFlag) {
 292       write_hit_record( ctx );
 293    }
 294    if (ctx->Select.NameStackDepth >= MAX_NAME_STACK_DEPTH) {
 295       _mesa_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 296    }
 297    else
 298       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 299 }
 300
 301
 302
 303 void
 304 _mesa_PopName( void )
 305 {
 306    GET_CURRENT_CONTEXT(ctx);
 307    ASSERT_OUTSIDE_BEGIN_END(ctx);
 308
 309    if (ctx->RenderMode != GL_SELECT) {
 310       return;
 311    }
 312
 313    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 314    if (ctx->Select.HitFlag) {
 315       write_hit_record( ctx );
 316    }
 317    if (ctx->Select.NameStackDepth == 0) {
 318       _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 319    }
 320    else
 321       ctx->Select.NameStackDepth--;
 322 }
 323
 324
 325
 326 /**********************************************************************/
 327 /*                           Render Mode                              */
 328 /**********************************************************************/
 329
 330
 331
 332 /*
 333  * NOTE: this function can't be put in a display list.
 334  */
 335 GLint
 336 _mesa_RenderMode( GLenum mode )
 337 {
 338    GET_CURRENT_CONTEXT(ctx);
 339    GLint result;
 340    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
 341
 342    if (MESA_VERBOSE & VERBOSE_API)
 343       fprintf(stderr, "glRenderMode %s\n", _mesa_lookup_enum_by_nr(mode));
 344
 345    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 346    ctx->_TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 347
 348    switch (ctx->RenderMode) {
 349       case GL_RENDER:
 350          result = 0;
 351          break;
 352       case GL_SELECT:
 353          if (ctx->Select.HitFlag) {
 354             write_hit_record( ctx );
 355          }
 356          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 357             /* overflow */
 358 #ifdef DEBUG
 359             _mesa_warning(ctx, "Feedback buffer overflow");
 360 #endif
 361             result = -1;
 362          }
 363          else {
 364             result = ctx->Select.Hits;
 365          }
 366          ctx->Select.BufferCount = 0;
 367          ctx->Select.Hits = 0;
 368          ctx->Select.NameStackDepth = 0;
 369          break;
 370       case GL_FEEDBACK:
 371          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 372             /* overflow */
 373             result = -1;
 374          }
 375          else {
 376             result = ctx->Feedback.Count;
 377          }
 378          ctx->Feedback.Count = 0;
 379          break;
 380       default:
 381          _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 382          return 0;
 383    }
 384
 385    switch (mode) {
 386       case GL_RENDER:
 387          break;
 388       case GL_SELECT:
 389          ctx->_TriangleCaps |= DD_SELECT;
 390          if (ctx->Select.BufferSize==0) {
 391             /* haven't called glSelectBuffer yet */
 392             _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 393          }
 394          break;
 395       case GL_FEEDBACK:
 396          ctx->_TriangleCaps |= DD_FEEDBACK;
 397          if (ctx->Feedback.BufferSize==0) {
 398             /* haven't called glFeedbackBuffer yet */
 399             _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 400          }
 401          break;
 402       default:
 403          _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 404          return 0;
 405    }
 406
 407    ctx->RenderMode = mode;
 408    if (ctx->Driver.RenderMode)
 409       ctx->Driver.RenderMode( ctx, mode );
 410
 411    return result;
 412 }