src/mesa/main/feedback.c

   1 /* $Id: feedback.c,v 1.1 1999/08/19 00:55:41 jtg Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.1
   6  *
   7  * Copyright (C) 1999  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
  29
  30
  31 #ifdef PC_HEADER
  32 #include "all.h"
  33 #else
  34 #include <assert.h>
  35 #include <stdio.h>
  36 #include "context.h"
  37 #include "enums.h"
  38 #include "feedback.h"
  39 #include "macros.h"
  40 #include "types.h"
  41 #ifdef XFree86Server
  42 #include "GL/xf86glx.h"
  43 #endif
  44 #endif
  45
  46
  47
  48 #define FB_3D           0x01
  49 #define FB_4D           0x02
  50 #define FB_INDEX        0x04
  51 #define FB_COLOR        0x08
  52 #define FB_TEXTURE      0X10
  53
  54
  55
  56 void
  57 gl_FeedbackBuffer( GLcontext *ctx, GLsizei size, GLenum type, GLfloat *buffer )
  58 {
  59    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH( ctx, "glFeedbackBuffer" );
  60
  61    if (ctx->RenderMode==GL_FEEDBACK) {
  62       gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
  63       return;
  64    }
  65
  66    if (size<0) {
  67       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
  68       return;
  69    }
  70    if (!buffer) {
  71       gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
  72       ctx->Feedback.BufferSize = 0;
  73       return;
  74    }
  75
  76    switch (type) {
  77       case GL_2D:
  78          ctx->Feedback.Mask = 0;
  79          ctx->Feedback.Type = type;
  80          break;
  81       case GL_3D:
  82          ctx->Feedback.Mask = FB_3D;
  83          ctx->Feedback.Type = type;
  84          break;
  85       case GL_3D_COLOR:
  86          ctx->Feedback.Mask = FB_3D
  87                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX);
  88          ctx->Feedback.Type = type;
  89          break;
  90       case GL_3D_COLOR_TEXTURE:
  91          ctx->Feedback.Mask = FB_3D
  92                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
  93                            | FB_TEXTURE;
  94          ctx->Feedback.Type = type;
  95          break;
  96       case GL_4D_COLOR_TEXTURE:
  97          ctx->Feedback.Mask = FB_3D | FB_4D
  98                            | (ctx->Visual->RGBAflag ? FB_COLOR : FB_INDEX)
  99                            | FB_TEXTURE;
 100          ctx->Feedback.Type = type;
 101          break;
 102       default:
 103          ctx->Feedback.Mask = 0;
 104          gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
 105    }
 106
 107    ctx->Feedback.BufferSize = size;
 108    ctx->Feedback.Buffer = buffer;
 109    ctx->Feedback.Count = 0;
 110 }
 111
 112
 113
 114 void gl_PassThrough( GLcontext *ctx, GLfloat token )
 115 {
 116    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPassThrough");
 117
 118    if (ctx->RenderMode==GL_FEEDBACK) {
 119       FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
 120       FEEDBACK_TOKEN( ctx, token );
 121    }
 122 }
 123
 124
 125
 126 /*
 127  * Put a vertex into the feedback buffer.
 128  */
 129 void gl_feedback_vertex( GLcontext *ctx,
 130                          GLfloat x, GLfloat y, GLfloat z, GLfloat w,
 131                          const GLfloat color[4], GLfloat index,
 132                          const GLfloat texcoord[4] )
 133 {
 134    FEEDBACK_TOKEN( ctx, x );
 135    FEEDBACK_TOKEN( ctx, y );
 136    if (ctx->Feedback.Mask & FB_3D) {
 137       FEEDBACK_TOKEN( ctx, z );
 138    }
 139    if (ctx->Feedback.Mask & FB_4D) {
 140       FEEDBACK_TOKEN( ctx, w );
 141    }
 142    if (ctx->Feedback.Mask & FB_INDEX) {
 143       FEEDBACK_TOKEN( ctx, 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
 161 /**********************************************************************/
 162 /*                              Selection                             */
 163 /**********************************************************************/
 164
 165
 166 /*
 167  * NOTE: this function can't be put in a display list.
 168  */
 169 void gl_SelectBuffer( GLcontext *ctx, GLsizei size, GLuint *buffer )
 170 {
 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
 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
 206 static void write_hit_record( GLcontext *ctx )
 207 {
 208    GLuint i;
 209    GLuint zmin, zmax, zscale = (~0u);
 210
 211    /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
 212    /* 2^32-1 and round to nearest unsigned integer. */
 213
 214    assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
 215    zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
 216    zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);
 217
 218    WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
 219    WRITE_RECORD( ctx, zmin );
 220    WRITE_RECORD( ctx, zmax );
 221    for (i=0;i<ctx->Select.NameStackDepth;i++) {
 222       WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
 223    }
 224
 225    ctx->Select.Hits++;
 226    ctx->Select.HitFlag = GL_FALSE;
 227    ctx->Select.HitMinZ = 1.0;
 228    ctx->Select.HitMaxZ = -1.0;
 229 }
 230
 231
 232
 233 void gl_InitNames( GLcontext *ctx )
 234 {
 235    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glInitNames");
 236    /* Record the hit before the HitFlag is wiped out again. */
 237    if (ctx->RenderMode==GL_SELECT) {
 238       if (ctx->Select.HitFlag) {
 239          write_hit_record( ctx );
 240       }
 241    }
 242    ctx->Select.NameStackDepth = 0;
 243    ctx->Select.HitFlag = GL_FALSE;
 244    ctx->Select.HitMinZ = 1.0;
 245    ctx->Select.HitMaxZ = 0.0;
 246 }
 247
 248
 249
 250 void gl_LoadName( GLcontext *ctx, GLuint name )
 251 {
 252    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glLoadName");
 253    if (ctx->RenderMode!=GL_SELECT) {
 254       return;
 255    }
 256    if (ctx->Select.NameStackDepth==0) {
 257       gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
 258       return;
 259    }
 260    if (ctx->Select.HitFlag) {
 261       write_hit_record( ctx );
 262    }
 263    if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
 264       ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
 265    }
 266    else {
 267       ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
 268    }
 269 }
 270
 271
 272 void gl_PushName( GLcontext *ctx, GLuint name )
 273 {
 274    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPushName");
 275    if (ctx->RenderMode!=GL_SELECT) {
 276       return;
 277    }
 278    if (ctx->Select.HitFlag) {
 279       write_hit_record( ctx );
 280    }
 281    if (ctx->Select.NameStackDepth<MAX_NAME_STACK_DEPTH) {
 282       ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
 283    }
 284    else {
 285       gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
 286    }
 287 }
 288
 289
 290
 291 void gl_PopName( GLcontext *ctx )
 292 {
 293    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPopName");
 294    if (ctx->RenderMode!=GL_SELECT) {
 295       return;
 296    }
 297    if (ctx->Select.HitFlag) {
 298       write_hit_record( ctx );
 299    }
 300    if (ctx->Select.NameStackDepth>0) {
 301       ctx->Select.NameStackDepth--;
 302    }
 303    else {
 304       gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
 305    }
 306 }
 307
 308
 309
 310 /**********************************************************************/
 311 /*                           Render Mode                              */
 312 /**********************************************************************/
 313
 314
 315
 316 /*
 317  * NOTE: this function can't be put in a display list.
 318  */
 319 GLint gl_RenderMode( GLcontext *ctx, GLenum mode )
 320 {
 321    GLint result;
 322
 323    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, "glRenderMode", 0);
 324
 325    if (MESA_VERBOSE & VERBOSE_API)
 326       fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));
 327
 328    ctx->TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);
 329
 330    switch (ctx->RenderMode) {
 331       case GL_RENDER:
 332          result = 0;
 333          break;
 334       case GL_SELECT:
 335          if (ctx->Select.HitFlag) {
 336             write_hit_record( ctx );
 337          }
 338          if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
 339             /* overflow */
 340 #ifdef DEBUG
 341             gl_warning(ctx, "Feedback buffer overflow");
 342 #endif
 343             result = -1;
 344          }
 345          else {
 346             result = ctx->Select.Hits;
 347          }
 348          ctx->Select.BufferCount = 0;
 349          ctx->Select.Hits = 0;
 350          ctx->Select.NameStackDepth = 0;
 351          break;
 352       case GL_FEEDBACK:
 353          if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
 354             /* overflow */
 355             result = -1;
 356          }
 357          else {
 358             result = ctx->Feedback.Count;
 359          }
 360          ctx->Feedback.Count = 0;
 361          break;
 362       default:
 363          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 364          return 0;
 365    }
 366
 367    switch (mode) {
 368       case GL_RENDER:
 369          break;
 370       case GL_SELECT:
 371          ctx->TriangleCaps |= DD_SELECT;
 372          if (ctx->Select.BufferSize==0) {
 373             /* haven't called glSelectBuffer yet */
 374             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 375          }
 376          break;
 377       case GL_FEEDBACK:
 378          ctx->TriangleCaps |= DD_FEEDBACK;
 379          if (ctx->Feedback.BufferSize==0) {
 380             /* haven't called glFeedbackBuffer yet */
 381             gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
 382          }
 383          break;
 384       default:
 385          gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
 386          return 0;
 387    }
 388
 389
 390    ctx->RenderMode = mode;
 391    ctx->NewState |= NEW_ALL;
 392
 393    return result;
 394 }
 395