src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.27 2002/10/24 23:57:20 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  4.1
   6  *
   7  * Copyright (C) 1999-2002  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 #include "glheader.h"
  29 #include "colormac.h"
  30 #include "context.h"
  31 #include "enums.h"
  32 #include "feedback.h"
  33 #include "macros.h"
  34 #include "mmath.h"
  35 #include "mtypes.h"
  36
  37
  38
  39 #define FB_3D           0x01
  40 #define FB_4D           0x02
  41 #define FB_INDEX        0x04
  42 #define FB_COLOR        0x08
  43 #define FB_TEXTURE      0X10
  44
  45
  46
  47 void
  48 _mesa_FeedbackBuffer( GLsizei size, GLenum type, GLfloat *buffer )
  49 {
  50    GET_CURRENT_CONTEXT(ctx);
  51    ASSERT_OUTSIDE_BEGIN_END(ctx);
  52
  53    if (ctx->RenderMode==GL_FEEDBACK) {
  54       _mesa_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  55       return;
  56    }
  57    if (size<0) {
  58       _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  59       return;
  60    }
  61    if (!buffer) {
  62       _mesa_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  63       ctx->Feedback.BufferSize = 0;
  64       return;
  65    }
  66
  67    switch (type) {
  68       case GL_2D:
  69          ctx->Feedback._Mask = 0;
  70          break;
  71       case GL_3D:
  72          ctx->Feedback._Mask = FB_3D;
  73          break;
  74       case GL_3D_COLOR:
  75          ctx->Feedback._Mask = (FB_3D |
  76                                 (ctx->Visual.rgbMode ? FB_COLOR : FB_INDEX));
  77          break;
  78       case GL_3D_COLOR_TEXTURE:
  79          ctx->Feedback._Mask = (FB_3D |
  80                                 (ctx->Visual.rgbMode ? FB_COLOR : FB_INDEX) |
  81                                 FB_TEXTURE);
  82          break;
  83       case GL_4D_COLOR_TEXTURE:
  84          ctx->Feedback._Mask = (FB_3D | FB_4D |
  85                                 (ctx->Visual.rgbMode ? FB_COLOR : FB_INDEX) |
  86                                 FB_TEXTURE);
  87          break;
  88       default:
  89          _mesa_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
  90          return;
  91    }
  92
  93    FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* Always flush */
  94    ctx->Feedback.Type = type;
  95    ctx->Feedback.BufferSize = size;
  96    ctx->Feedback.Buffer = buffer;
  97    ctx->Feedback.Count = 0;                   /* Becaues of this. */
  98 }
  99
 100
 101 void
 102 _mesa_PassThrough( GLfloat token )
 103 {
 104    GET_CURRENT_CONTEXT(ctx);
 105    ASSERT_OUTSIDE_BEGIN_END(ctx);
 106
 107    if (ctx->RenderMode==GL_FEEDBACK) {
 108       FLUSH_VERTICES(ctx, 0);
 109       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 110       FEEDBACK_TOKEN( ctx, token );
 111    }
 112 }
 113
 114
 115
 116 /*
 117  * Put a vertex into the feedback buffer.
 118  */
 119 void _mesa_feedback_vertex( GLcontext *ctx,
 120                          const GLfloat win[4],
 121                          const GLfloat color[4],
 122                          GLuint index,
 123                          const GLfloat texcoord[4] )
 124 {
 125    FEEDBACK_TOKEN( ctx, win[0] );
 126    FEEDBACK_TOKEN( ctx, win[1] );
 127    if (ctx->Feedback._Mask & FB_3D) {
 128       FEEDBACK_TOKEN( ctx, win[2] );
 129    }
 130    if (ctx->Feedback._Mask & FB_4D) {
 131       FEEDBACK_TOKEN( ctx, win[3] );
 132    }
 133    if (ctx->Feedback._Mask & FB_INDEX) {
 134       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 135    }
 136    if (ctx->Feedback._Mask & FB_COLOR) {
 137       FEEDBACK_TOKEN( ctx, color[0] );
 138       FEEDBACK_TOKEN( ctx, color[1] );
 139       FEEDBACK_TOKEN( ctx, color[2] );
 140       FEEDBACK_TOKEN( ctx, color[3] );
 141    }
 142    if (ctx->Feedback._Mask & FB_TEXTURE) {
 143       FEEDBACK_TOKEN( ctx, texcoord[0] );
 144       FEEDBACK_TOKEN( ctx, texcoord[1] );
 145       FEEDBACK_TOKEN( ctx, texcoord[2] );
 146       FEEDBACK_TOKEN( ctx, texcoord[3] );
 147    }
 148 }
 149
 150
 151 /**********************************************************************/
 152 /*                              Selection                             */
 153 /**********************************************************************/
 154
 155
 156 /*
 157  * NOTE: this function can't be put in a display list.
 158  */
 159 void
 160 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 161 {
 162    GET_CURRENT_CONTEXT(ctx);
 163    ASSERT_OUTSIDE_BEGIN_END(ctx);
 164
 165    if (ctx->RenderMode==GL_SELECT) {
 166       _mesa_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 167       return;                   /* KW: added return */
 168    }
 169
 170    FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* why bother? */
 171    ctx->Select.Buffer = buffer;
 172    ctx->Select.BufferSize = size;
 173    ctx->Select.BufferCount = 0;
 174    ctx->Select.HitFlag = GL_FALSE;
 175    ctx->Select.HitMinZ = 1.0;
 176    ctx->Select.HitMaxZ = 0.0;
 177 }
 178
 179
 180 #define WRITE_RECORD( CTX, V )                                  \
 181         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 182            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 183         }                                                       \
 184         CTX->Select.BufferCount++;
 185
 186
 187
 188 void _mesa_update_hitflag( GLcontext *ctx, GLfloat z )
 189 {
 190    ctx->Select.HitFlag = GL_TRUE;
 191    if (z < ctx->Select.HitMinZ) {
 192       ctx->Select.HitMinZ = z;
 193    }
 194    if (z > ctx->Select.HitMaxZ) {
 195       ctx->Select.HitMaxZ = z;
 196    }
 197 }
 198
 199
 200 static void write_hit_record( GLcontext *ctx )
 201 {
 202    GLuint i;
 203    GLuint zmin, zmax, zscale = (~0u);
 204
 205    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 206    /* 2^32-1 and round to nearest unsigned integer. */
 207
 208    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 209    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 210    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 211
 212    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 213    WRITE_RECORD( ctx, zmin );
 214    WRITE_RECORD( ctx, zmax );
 215    for (i = 0; i < ctx->Select.NameStackDepth; i++) {
 216       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 217    }
 218
 219    ctx->Select.Hits++;
 220    ctx->Select.HitFlag = GL_FALSE;
 221    ctx->Select.HitMinZ = 1.0;
 222    ctx->Select.HitMaxZ = -1.0;
 223 }
 224
 225
 226
 227 void
 228 _mesa_InitNames( void )
 229 {
 230    GET_CURRENT_CONTEXT(ctx);
 231    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 232
 233    /* Record the hit before the HitFlag is wiped out again. */
 234    if (ctx->RenderMode == GL_SELECT) {
 235       if (ctx->Select.HitFlag) {
 236          write_hit_record( ctx );
 237       }
 238    }
 239    ctx->Select.NameStackDepth = 0;
 240    ctx->Select.HitFlag = GL_FALSE;
 241    ctx->Select.HitMinZ = 1.0;
 242    ctx->Select.HitMaxZ = 0.0;
 243    ctx->NewState |= _NEW_RENDERMODE;
 244 }
 245
 246
 247
 248 void
 249 _mesa_LoadName( GLuint name )
 250 {
 251    GET_CURRENT_CONTEXT(ctx);
 252    ASSERT_OUTSIDE_BEGIN_END(ctx);
 253
 254    if (ctx->RenderMode != GL_SELECT) {
 255       return;
 256    }
 257    if (ctx->Select.NameStackDepth == 0) {
 258       _mesa_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 259       return;
 260    }
 261
 262    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 263
 264    if (ctx->Select.HitFlag) {
 265       write_hit_record( ctx );
 266    }
 267    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 268       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 269    }
 270    else {
 271       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 272    }
 273 }
 274
 275
 276 void
 277 _mesa_PushName( GLuint name )
 278 {
 279    GET_CURRENT_CONTEXT(ctx);
 280    ASSERT_OUTSIDE_BEGIN_END(ctx);
 281
 282    if (ctx->RenderMode != GL_SELECT) {
 283       return;
 284    }
 285
 286    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 287    if (ctx->Select.HitFlag) {
 288       write_hit_record( ctx );
 289    }
 290    if (ctx->Select.NameStackDepth >= MAX_NAME_STACK_DEPTH) {
 291       _mesa_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 292    }
 293    else
 294       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 295 }
 296
 297
 298
 299 void
 300 _mesa_PopName( void )
 301 {
 302    GET_CURRENT_CONTEXT(ctx);
 303    ASSERT_OUTSIDE_BEGIN_END(ctx);
 304
 305    if (ctx->RenderMode != GL_SELECT) {
 306       return;
 307    }
 308
 309    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 310    if (ctx->Select.HitFlag) {
 311       write_hit_record( ctx );
 312    }
 313    if (ctx->Select.NameStackDepth == 0) {
 314       _mesa_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 315    }
 316    else
 317       ctx->Select.NameStackDepth--;
 318 }
 319
 320
 321
 322 /**********************************************************************/
 323 /*                           Render Mode                              */
 324 /**********************************************************************/
 325
 326
 327
 328 /*
 329  * NOTE: this function can't be put in a display list.
 330  */
 331 GLint
 332 _mesa_RenderMode( GLenum mode )
 333 {
 334    GET_CURRENT_CONTEXT(ctx);
 335    GLint result;
 336    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
 337
 338    if (MESA_VERBOSE & VERBOSE_API)
 339       _mesa_debug(ctx, "glRenderMode %s\n", _mesa_lookup_enum_by_nr(mode));
 340
 341    FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
 342
 343    switch (ctx->RenderMode) {
 344       case GL_RENDER:
 345          result = 0;
 346          break;
 347       case GL_SELECT:
 348          if (ctx->Select.HitFlag) {
 349             write_hit_record( ctx );
 350          }
 351          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 352             /* overflow */
 353 #ifdef DEBUG
 354             _mesa_warning(ctx, "Feedback buffer overflow");
 355 #endif
 356             result = -1;
 357          }
 358          else {
 359             result = ctx->Select.Hits;
 360          }
 361          ctx->Select.BufferCount = 0;
 362          ctx->Select.Hits = 0;
 363          ctx->Select.NameStackDepth = 0;
 364          break;
 365       case GL_FEEDBACK:
 366          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 367             /* overflow */
 368             result = -1;
 369          }
 370          else {
 371             result = ctx->Feedback.Count;
 372          }
 373          ctx->Feedback.Count = 0;
 374          break;
 375       default:
 376          _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 377          return 0;
 378    }
 379
 380    switch (mode) {
 381       case GL_RENDER:
 382          break;
 383       case GL_SELECT:
 384          if (ctx->Select.BufferSize==0) {
 385             /* haven't called glSelectBuffer yet */
 386             _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 387          }
 388          break;
 389       case GL_FEEDBACK:
 390          if (ctx->Feedback.BufferSize==0) {
 391             /* haven't called glFeedbackBuffer yet */
 392             _mesa_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 393          }
 394          break;
 395       default:
 396          _mesa_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 397          return 0;
 398    }
 399
 400    ctx->RenderMode = mode;
 401    if (ctx->Driver.RenderMode)
 402       ctx->Driver.RenderMode( ctx, mode );
 403
 404    return result;
 405 }