src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.16 2000/11/05 18:40:57 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 "types.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_AND_FLUSH( ctx, "glFeedbackBuffer" );
  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;
  69       return;
  70    }
  71
  72    switch (type) {
  73       case GL_2D:
  74          ctx->Feedback.Mask = 0;
  75          ctx->Feedback.Type = type;
  76          break;
  77       case GL_3D:
  78          ctx->Feedback.Mask = FB_3D;
  79          ctx->Feedback.Type = type;
  80          break;
  81       case GL_3D_COLOR:
  82          ctx->Feedback.Mask = FB_3D
  83                            | (ctx->Visual.RGBAflag ? FB_COLOR : FB_INDEX);
  84          ctx->Feedback.Type = type;
  85          break;
  86       case GL_3D_COLOR_TEXTURE:
  87          ctx->Feedback.Mask = FB_3D
  88                            | (ctx->Visual.RGBAflag ? FB_COLOR : FB_INDEX)
  89                            | FB_TEXTURE;
  90          ctx->Feedback.Type = type;
  91          break;
  92       case GL_4D_COLOR_TEXTURE:
  93          ctx->Feedback.Mask = FB_3D | FB_4D
  94                            | (ctx->Visual.RGBAflag ? FB_COLOR : FB_INDEX)
  95                            | FB_TEXTURE;
  96          ctx->Feedback.Type = type;
  97          break;
  98       default:
  99          ctx->Feedback.Mask = 0;
 100          gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
 101    }
 102
 103    ctx->Feedback.BufferSize = size;
 104    ctx->Feedback.Buffer = buffer;
 105    ctx->Feedback.Count = 0;
 106    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 107 }
 108
 109
 110
 111 void
 112 _mesa_PassThrough( GLfloat token )
 113 {
 114    GET_CURRENT_CONTEXT(ctx);
 115    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
 116
 117    if (ctx->RenderMode==GL_FEEDBACK) {
 118       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 119       FEEDBACK_TOKEN( ctx, token );
 120    }
 121 }
 122
 123
 124
 125 /*
 126  * Put a vertex into the feedback buffer.
 127  */
 128 void gl_feedback_vertex( GLcontext *ctx,
 129                          const GLfloat win[4],
 130                          const GLfloat color[4],
 131                          GLuint index,
 132                          const GLfloat texcoord[4] )
 133 {
 134    FEEDBACK_TOKEN( ctx, win[0] );
 135    FEEDBACK_TOKEN( ctx, win[1] );
 136    if (ctx->Feedback.Mask & FB_3D) {
 137       FEEDBACK_TOKEN( ctx, win[2] );
 138    }
 139    if (ctx->Feedback.Mask & FB_4D) {
 140       FEEDBACK_TOKEN( ctx, win[3] );
 141    }
 142    if (ctx->Feedback.Mask & FB_INDEX) {
 143       FEEDBACK_TOKEN( ctx, (GLfloat) index );
 144    }
 145    if (ctx->Feedback.Mask & FB_COLOR) {
 146       FEEDBACK_TOKEN( ctx, color[0] );
 147       FEEDBACK_TOKEN( ctx, color[1] );
 148       FEEDBACK_TOKEN( ctx, color[2] );
 149       FEEDBACK_TOKEN( ctx, color[3] );
 150    }
 151    if (ctx->Feedback.Mask & FB_TEXTURE) {
 152       FEEDBACK_TOKEN( ctx, texcoord[0] );
 153       FEEDBACK_TOKEN( ctx, texcoord[1] );
 154       FEEDBACK_TOKEN( ctx, texcoord[2] );
 155       FEEDBACK_TOKEN( ctx, texcoord[3] );
 156    }
 157 }
 158
 159 /**********************************************************************/
 160 /*                              Selection                             */
 161 /**********************************************************************/
 162
 163
 164 /*
 165  * NOTE: this function can't be put in a display list.
 166  */
 167 void
 168 _mesa_SelectBuffer( GLsizei size, GLuint *buffer )
 169 {
 170    GET_CURRENT_CONTEXT(ctx);
 171    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glSelectBuffer");
 172    if (ctx->RenderMode==GL_SELECT) {
 173       gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
 174    }
 175    ctx->Select.Buffer = buffer;
 176    ctx->Select.BufferSize = size;
 177    ctx->Select.BufferCount = 0;
 178
 179    ctx->Select.HitFlag = GL_FALSE;
 180    ctx->Select.HitMinZ = 1.0;
 181    ctx->Select.HitMaxZ = 0.0;
 182
 183    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 184 }
 185
 186
 187 #define WRITE_RECORD( CTX, V )                                  \
 188         if (CTX->Select.BufferCount < CTX->Select.BufferSize) { \
 189            CTX->Select.Buffer[CTX->Select.BufferCount] = (V);   \
 190         }                                                       \
 191         CTX->Select.BufferCount++;
 192
 193
 194
 195 void gl_update_hitflag( GLcontext *ctx, GLfloat z )
 196 {
 197    ctx->Select.HitFlag = GL_TRUE;
 198    if (z < ctx->Select.HitMinZ) {
 199       ctx->Select.HitMinZ = z;
 200    }
 201    if (z > ctx->Select.HitMaxZ) {
 202       ctx->Select.HitMaxZ = z;
 203    }
 204 }
 205
 206
 207 static void write_hit_record( GLcontext *ctx )
 208 {
 209    GLuint i;
 210    GLuint zmin, zmax, zscale = (~0u);
 211
 212    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 213    /* 2^32-1 and round to nearest unsigned integer. */
 214
 215    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 216    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 217    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 218
 219    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 220    WRITE_RECORD( ctx, zmin );
 221    WRITE_RECORD( ctx, zmax );
 222    for (i = 0; i < ctx->Select.NameStackDepth; i++) {
 223       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 224    }
 225
 226    ctx->Select.Hits++;
 227    ctx->Select.HitFlag = GL_FALSE;
 228    ctx->Select.HitMinZ = 1.0;
 229    ctx->Select.HitMaxZ = -1.0;
 230 }
 231
 232
 233
 234 void
 235 _mesa_InitNames( void )
 236 {
 237    GET_CURRENT_CONTEXT(ctx);
 238    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 239    /* Record the hit before the HitFlag is wiped out again. */
 240    if (ctx->RenderMode == GL_SELECT) {
 241       if (ctx->Select.HitFlag) {
 242          write_hit_record( ctx );
 243       }
 244    }
 245    ctx->Select.NameStackDepth = 0;
 246    ctx->Select.HitFlag = GL_FALSE;
 247    ctx->Select.HitMinZ = 1.0;
 248    ctx->Select.HitMaxZ = 0.0;
 249    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 250 }
 251
 252
 253
 254 void
 255 _mesa_LoadName( GLuint name )
 256 {
 257    GET_CURRENT_CONTEXT(ctx);
 258    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 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    if (ctx->Select.HitFlag) {
 267       write_hit_record( ctx );
 268    }
 269    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 270       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 271    }
 272    else {
 273       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 274    }
 275    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 276 }
 277
 278
 279 void
 280 _mesa_PushName( GLuint name )
 281 {
 282    GET_CURRENT_CONTEXT(ctx);
 283    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
 284    if (ctx->RenderMode != GL_SELECT) {
 285       return;
 286    }
 287    if (ctx->Select.HitFlag) {
 288       write_hit_record( ctx );
 289    }
 290    if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
 291       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 292    }
 293    else {
 294       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 295    }
 296    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 297 }
 298
 299
 300
 301 void
 302 _mesa_PopName( void )
 303 {
 304    GET_CURRENT_CONTEXT(ctx);
 305    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 306    if (ctx->RenderMode != GL_SELECT) {
 307       return;
 308    }
 309    if (ctx->Select.HitFlag) {
 310       write_hit_record( ctx );
 311    }
 312    if (ctx->Select.NameStackDepth > 0) {
 313       ctx->Select.NameStackDepth--;
 314    }
 315    else {
 316       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 317    }
 318    ctx->NewState |= _NEW_FEEDBACK_SELECT;
 319 }
 320
 321
 322
 323 /**********************************************************************/
 324 /*                           Render Mode                              */
 325 /**********************************************************************/
 326
 327
 328
 329 /*
 330  * NOTE: this function can't be put in a display list.
 331  */
 332 GLint
 333 _mesa_RenderMode( GLenum mode )
 334 {
 335    GET_CURRENT_CONTEXT(ctx);
 336    GLint result;
 337
 338    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 339
 340    if (MESA_VERBOSE & VERBOSE_API)
 341       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 342
 343    ctx->_TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 344
 345    switch (ctx->RenderMode) {
 346       case GL_RENDER:
 347          result = 0;
 348          break;
 349       case GL_SELECT:
 350          if (ctx->Select.HitFlag) {
 351             write_hit_record( ctx );
 352          }
 353          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 354             /* overflow */
 355 #ifdef DEBUG
 356             _mesa_warning(ctx, "Feedback buffer overflow");
 357 #endif
 358             result = -1;
 359          }
 360          else {
 361             result = ctx->Select.Hits;
 362          }
 363          ctx->Select.BufferCount = 0;
 364          ctx->Select.Hits = 0;
 365          ctx->Select.NameStackDepth = 0;
 366          ctx->NewState |= _NEW_FEEDBACK_SELECT;
 367          break;
 368       case GL_FEEDBACK:
 369          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 370             /* overflow */
 371             result = -1;
 372          }
 373          else {
 374             result = ctx->Feedback.Count;
 375          }
 376          ctx->Feedback.Count = 0;
 377          ctx->NewState |= _NEW_FEEDBACK_SELECT;
 378          break;
 379       default:
 380          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 381          return 0;
 382    }
 383
 384    switch (mode) {
 385       case GL_RENDER:
 386          break;
 387       case GL_SELECT:
 388          ctx->_TriangleCaps |= DD_SELECT;
 389          if (ctx->Select.BufferSize==0) {
 390             /* haven't called glSelectBuffer yet */
 391             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 392          }
 393          break;
 394       case GL_FEEDBACK:
 395          ctx->_TriangleCaps |= DD_FEEDBACK;
 396          if (ctx->Feedback.BufferSize==0) {
 397             /* haven't called glFeedbackBuffer yet */
 398             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 399          }
 400          break;
 401       default:
 402          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 403          return 0;
 404    }
 405
 406    ctx->RenderMode = mode;
 407    ctx->NewState |= _NEW_RENDERMODE;
 408
 409    return result;
 410 }
 411