src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.18 2000/12/26 05:09:28 keithw Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  *
   7  * Copyright (C) 1999-2000  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       gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  59       return;
  60    }
  61
  62    if (size<0) {
  63       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  64       return;
  65    }
  66    if (!buffer) {
  67       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  68       ctx->Feedback.BufferSize = 0; /* XXX -- Sould this be here??? */
  69       return;
  70    }
  71
  72    switch (type) {
  73       case GL_2D:
  74          ctx->Feedback._Mask = 0;
  75          break;
  76       case GL_3D:
  77          ctx->Feedback._Mask = FB_3D;
  78          break;
  79       case GL_3D_COLOR:
  80          ctx->Feedback._Mask = (FB_3D |
  81                                 (ctx->Visual.RGBAflag ? FB_COLOR : FB_INDEX));
  82          break;
  83       case GL_3D_COLOR_TEXTURE:
  84          ctx->Feedback._Mask = (FB_3D |
  85                                 (ctx->Visual.RGBAflag ? FB_COLOR : FB_INDEX) |
  86                                 FB_TEXTURE);
  87          break;
  88       case GL_4D_COLOR_TEXTURE:
  89          ctx->Feedback._Mask = (FB_3D | FB_4D |
  90                                 (ctx->Visual.RGBAflag ? FB_COLOR : FB_INDEX) |
  91                                 FB_TEXTURE);
  92          break;
  93       default:
  94          gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
  95          return;
  96    }
  97
  98    FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* Always flush */
  99    ctx->Feedback.Type = type;
 100    ctx->Feedback.BufferSize = size;
 101    ctx->Feedback.Buffer = buffer;
 102    ctx->Feedback.Count = 0;                   /* Becaues of this. */
 103 }
 104
 105
 106
 107 void
 108 _mesa_PassThrough( GLfloat token )
 109 {
 110    GET_CURRENT_CONTEXT(ctx);
 111    ASSERT_OUTSIDE_BEGIN_END(ctx);
 112
 113    if (ctx->RenderMode==GL_FEEDBACK) {
 114       FLUSH_VERTICES(ctx, 0);
 115       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 116       FEEDBACK_TOKEN( ctx, token );
 117    }
 118 }
 119
 120
 121
 122 /*
 123  * Put a vertex into the feedback buffer.
 124  */
 125 void gl_feedback_vertex( GLcontext *ctx,
 126                          const GLfloat win[4],
 127                          const GLfloat color[4],
 128                          GLuint index,
 129                          const GLfloat texcoord[4] )
 130 {
 131    FEEDBACK_TOKEN( ctx, win[0] );
 132    FEEDBACK_TOKEN( ctx, win[1] );
 133    if (ctx->Feedback._Mask & FB_3D) {
 134       FEEDBACK_TOKEN( ctx, win[2] );
 135    }
 136    if (ctx->Feedback._Mask & FB_4D) {
 137       FEEDBACK_TOKEN( ctx, win[3] );
 138    }
 139    if (ctx->Feedback._Mask & FB_INDEX) {
 140       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 141    }
 142    if (ctx->Feedback._Mask & FB_COLOR) {
 143       FEEDBACK_TOKEN( ctx, color[0] );
 144       FEEDBACK_TOKEN( ctx, color[1] );
 145       FEEDBACK_TOKEN( ctx, color[2] );
 146       FEEDBACK_TOKEN( ctx, color[3] );
 147    }
 148    if (ctx->Feedback._Mask & FB_TEXTURE) {
 149       FEEDBACK_TOKEN( ctx, texcoord[0] );
 150       FEEDBACK_TOKEN( ctx, texcoord[1] );
 151       FEEDBACK_TOKEN( ctx, texcoord[2] );
 152       FEEDBACK_TOKEN( ctx, texcoord[3] );
 153    }
 154 }
 155
 156 /**********************************************************************/
 157 /*                              Selection                             */
 158 /**********************************************************************/
 159
 160
 161 /*
 162  * NOTE: this function can't be put in a display list.
 163  */
 164 void
 165 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 166 {
 167    GET_CURRENT_CONTEXT(ctx);
 168    ASSERT_OUTSIDE_BEGIN_END(ctx);
 169
 170    if (ctx->RenderMode==GL_SELECT) {
 171       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 172       return;                   /* KW: added return */
 173    }
 174
 175    FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* why bother? */
 176    ctx->Select.Buffer = buffer;
 177    ctx->Select.BufferSize = size;
 178    ctx->Select.BufferCount = 0;
 179    ctx->Select.HitFlag = GL_FALSE;
 180    ctx->Select.HitMinZ = 1.0;
 181    ctx->Select.HitMaxZ = 0.0;
 182 }
 183
 184
 185 #define WRITE_RECORD( CTX, V )                                  \
 186         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 187            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 188         }                                                       \
 189         CTX->Select.BufferCount++;
 190
 191
 192
 193 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 194 {
 195    ctx->Select.HitFlag = GL_TRUE;
 196    if (z < ctx->Select.HitMinZ) {
 197       ctx->Select.HitMinZ = z;
 198    }
 199    if (z > ctx->Select.HitMaxZ) {
 200       ctx->Select.HitMaxZ = z;
 201    }
 202 }
 203
 204
 205 static void write_hit_record( GLcontext *ctx )
 206 {
 207    GLuint i;
 208    GLuint zmin, zmax, zscale = (~0u);
 209
 210    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 211    /* 2^32-1 and round to nearest unsigned integer. */
 212
 213    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 214    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 215    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 216
 217    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 218    WRITE_RECORD( ctx, zmin );
 219    WRITE_RECORD( ctx, zmax );
 220    for (i = 0; i < ctx->Select.NameStackDepth; i++) {
 221       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 222    }
 223
 224    ctx->Select.Hits++;
 225    ctx->Select.HitFlag = GL_FALSE;
 226    ctx->Select.HitMinZ = 1.0;
 227    ctx->Select.HitMaxZ = -1.0;
 228 }
 229
 230
 231
 232 void
 233 _mesa_InitNames( void )
 234 {
 235    GET_CURRENT_CONTEXT(ctx);
 236    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 237
 238    /* Record the hit before the HitFlag is wiped out again. */
 239    if (ctx->RenderMode == GL_SELECT) {
 240       if (ctx->Select.HitFlag) {
 241          write_hit_record( ctx );
 242       }
 243    }
 244    ctx->Select.NameStackDepth = 0;
 245    ctx->Select.HitFlag = GL_FALSE;
 246    ctx->Select.HitMinZ = 1.0;
 247    ctx->Select.HitMaxZ = 0.0;
 248    ctx->NewState |= _NEW_RENDERMODE;
 249 }
 250
 251
 252
 253 void
 254 _mesa_LoadName( GLuint name )
 255 {
 256    GET_CURRENT_CONTEXT(ctx);
 257    ASSERT_OUTSIDE_BEGIN_END(ctx);
 258
 259    if (ctx->RenderMode != GL_SELECT) {
 260       return;
 261    }
 262    if (ctx->Select.NameStackDepth == 0) {
 263       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 264       return;
 265    }
 266
 267    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 268
 269    if (ctx->Select.HitFlag) {
 270       write_hit_record( ctx );
 271    }
 272    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 273       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 274    }
 275    else {
 276       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 277    }
 278 }
 279
 280
 281 void
 282 _mesa_PushName( GLuint name )
 283 {
 284    GET_CURRENT_CONTEXT(ctx);
 285    ASSERT_OUTSIDE_BEGIN_END(ctx);
 286
 287    if (ctx->RenderMode != GL_SELECT) {
 288       return;
 289    }
 290
 291    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 292    if (ctx->Select.HitFlag) {
 293       write_hit_record( ctx );
 294    }
 295    if (ctx->Select.NameStackDepth >= MAX_NAME_STACK_DEPTH) {
 296       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 297    }
 298    else
 299       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 300 }
 301
 302
 303
 304 void
 305 _mesa_PopName( void )
 306 {
 307    GET_CURRENT_CONTEXT(ctx);
 308    ASSERT_OUTSIDE_BEGIN_END(ctx);
 309
 310    if (ctx->RenderMode != GL_SELECT) {
 311       return;
 312    }
 313
 314    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 315    if (ctx->Select.HitFlag) {
 316       write_hit_record( ctx );
 317    }
 318    if (ctx->Select.NameStackDepth == 0) {
 319       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 320    }
 321    else
 322       ctx->Select.NameStackDepth--;
 323 }
 324
 325
 326
 327 /**********************************************************************/
 328 /*                           Render Mode                              */
 329 /**********************************************************************/
 330
 331
 332
 333 /*
 334  * NOTE: this function can't be put in a display list.
 335  */
 336 GLint
 337 _mesa_RenderMode( GLenum mode )
 338 {
 339    GET_CURRENT_CONTEXT(ctx);
 340    GLint result;
 341    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
 342
 343    if (MESA_VERBOSE & VERBOSE_API)
 344       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 345
 346    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 347    ctx->_TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 348
 349    switch (ctx->RenderMode) {
 350       case GL_RENDER:
 351          result = 0;
 352          break;
 353       case GL_SELECT:
 354          if (ctx->Select.HitFlag) {
 355             write_hit_record( ctx );
 356          }
 357          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 358             /* overflow */
 359 #ifdef DEBUG
 360             _mesa_warning(ctx, "Feedback buffer overflow");
 361 #endif
 362             result = -1;
 363          }
 364          else {
 365             result = ctx->Select.Hits;
 366          }
 367          ctx->Select.BufferCount = 0;
 368          ctx->Select.Hits = 0;
 369          ctx->Select.NameStackDepth = 0;
 370          break;
 371       case GL_FEEDBACK:
 372          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 373             /* overflow */
 374             result = -1;
 375          }
 376          else {
 377             result = ctx->Feedback.Count;
 378          }
 379          ctx->Feedback.Count = 0;
 380          break;
 381       default:
 382          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 383          return 0;
 384    }
 385
 386    switch (mode) {
 387       case GL_RENDER:
 388          break;
 389       case GL_SELECT:
 390          ctx->_TriangleCaps |= DD_SELECT;
 391          if (ctx->Select.BufferSize==0) {
 392             /* haven't called glSelectBuffer yet */
 393             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 394          }
 395          break;
 396       case GL_FEEDBACK:
 397          ctx->_TriangleCaps |= DD_FEEDBACK;
 398          if (ctx->Feedback.BufferSize==0) {
 399             /* haven't called glFeedbackBuffer yet */
 400             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 401          }
 402          break;
 403       default:
 404          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 405          return 0;
 406    }
 407
 408    ctx->RenderMode = mode;
 409    return result;
 410 }
 411