summaryrefslogtreecommitdiff
path: root/src/mesa/main/feedback.c
blob: 1ddd12f320345c7753e66d9f3b95c07cd0d22068 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
/* $Id: feedback.c,v 1.21 2001/01/23 23:39:36 brianp Exp $ */

/*
 * Mesa 3-D graphics library
 * Version:  3.5
 *
 * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


#ifdef PC_HEADER
#include "all.h"
#else
#include "glheader.h"
#include "colormac.h"
#include "context.h"
#include "enums.h"
#include "feedback.h"
#include "macros.h"
#include "mmath.h"
#include "mtypes.h"
#endif



#define FB_3D		0x01
#define FB_4D		0x02
#define FB_INDEX	0x04
#define FB_COLOR	0x08
#define FB_TEXTURE	0X10



void
_mesa_FeedbackBuffer( GLsizei size, GLenum type, GLfloat *buffer )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx); 

   if (ctx->RenderMode==GL_FEEDBACK) {
      gl_error( ctx, GL_INVALID_OPERATION, "glFeedbackBuffer" );
      return;
   }
   if (size<0) {
      gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(size<0)" );
      return;
   }
   if (!buffer) {
      gl_error( ctx, GL_INVALID_VALUE, "glFeedbackBuffer(buffer==NULL)" );
      ctx->Feedback.BufferSize = 0; 
      return;
   }

   switch (type) {
      case GL_2D:
	 ctx->Feedback._Mask = 0;
	 break;
      case GL_3D:
	 ctx->Feedback._Mask = FB_3D;
	 break;
      case GL_3D_COLOR:
	 ctx->Feedback._Mask = (FB_3D | 
				(ctx->Visual.rgbMode ? FB_COLOR : FB_INDEX));
	 break;
      case GL_3D_COLOR_TEXTURE:
	 ctx->Feedback._Mask = (FB_3D | 
				(ctx->Visual.rgbMode ? FB_COLOR : FB_INDEX) | 
				FB_TEXTURE);
	 break;
      case GL_4D_COLOR_TEXTURE:
	 ctx->Feedback._Mask = (FB_3D | FB_4D | 
				(ctx->Visual.rgbMode ? FB_COLOR : FB_INDEX) |
				FB_TEXTURE);
	 break;
      default:
         gl_error( ctx, GL_INVALID_ENUM, "glFeedbackBuffer" );
	 return;
   }

   FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* Always flush */
   ctx->Feedback.Type = type;
   ctx->Feedback.BufferSize = size;
   ctx->Feedback.Buffer = buffer;
   ctx->Feedback.Count = 0;	              /* Becaues of this. */
}


void
_mesa_PassThrough( GLfloat token )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->RenderMode==GL_FEEDBACK) {
      FLUSH_VERTICES(ctx, 0);
      FEEDBACK_TOKEN( ctx, (GLfloat) (GLint) GL_PASS_THROUGH_TOKEN );
      FEEDBACK_TOKEN( ctx, token );
   }
}



/*
 * Put a vertex into the feedback buffer.
 */
void gl_feedback_vertex( GLcontext *ctx,
                         const GLfloat win[4],
			 const GLfloat color[4],
			 GLuint index,
			 const GLfloat texcoord[4] )
{
   FEEDBACK_TOKEN( ctx, win[0] );
   FEEDBACK_TOKEN( ctx, win[1] );
   if (ctx->Feedback._Mask & FB_3D) {
      FEEDBACK_TOKEN( ctx, win[2] );
   }
   if (ctx->Feedback._Mask & FB_4D) {
      FEEDBACK_TOKEN( ctx, win[3] );
   }
   if (ctx->Feedback._Mask & FB_INDEX) {
      FEEDBACK_TOKEN( ctx, (GLfloat) index );
   }
   if (ctx->Feedback._Mask & FB_COLOR) {
      FEEDBACK_TOKEN( ctx, color[0] );
      FEEDBACK_TOKEN( ctx, color[1] );
      FEEDBACK_TOKEN( ctx, color[2] );
      FEEDBACK_TOKEN( ctx, color[3] );
   }
   if (ctx->Feedback._Mask & FB_TEXTURE) {
      FEEDBACK_TOKEN( ctx, texcoord[0] );
      FEEDBACK_TOKEN( ctx, texcoord[1] );
      FEEDBACK_TOKEN( ctx, texcoord[2] );
      FEEDBACK_TOKEN( ctx, texcoord[3] );
   }
}


/**********************************************************************/
/*                              Selection                             */
/**********************************************************************/


/*
 * NOTE: this function can't be put in a display list.
 */
void
_mesa_SelectBuffer( GLsizei size, GLuint *buffer )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->RenderMode==GL_SELECT) {
      gl_error( ctx, GL_INVALID_OPERATION, "glSelectBuffer" );
      return;			/* KW: added return */
   }

   FLUSH_VERTICES(ctx, _NEW_RENDERMODE); /* why bother? */
   ctx->Select.Buffer = buffer;
   ctx->Select.BufferSize = size;
   ctx->Select.BufferCount = 0;
   ctx->Select.HitFlag = GL_FALSE;
   ctx->Select.HitMinZ = 1.0;
   ctx->Select.HitMaxZ = 0.0;
}


#define WRITE_RECORD( CTX, V )					\
	if (CTX->Select.BufferCount < CTX->Select.BufferSize) {	\
	   CTX->Select.Buffer[CTX->Select.BufferCount] = (V);	\
	}							\
	CTX->Select.BufferCount++;



void gl_update_hitflag( GLcontext *ctx, GLfloat z )
{
   ctx->Select.HitFlag = GL_TRUE;
   if (z < ctx->Select.HitMinZ) {
      ctx->Select.HitMinZ = z;
   }
   if (z > ctx->Select.HitMaxZ) {
      ctx->Select.HitMaxZ = z;
   }
}


static void write_hit_record( GLcontext *ctx )
{
   GLuint i;
   GLuint zmin, zmax, zscale = (~0u);

   /* HitMinZ and HitMaxZ are in [0,1].  Multiply these values by */
   /* 2^32-1 and round to nearest unsigned integer. */

   assert( ctx != NULL ); /* this line magically fixes a SunOS 5.x/gcc bug */
   zmin = (GLuint) ((GLfloat) zscale * ctx->Select.HitMinZ);
   zmax = (GLuint) ((GLfloat) zscale * ctx->Select.HitMaxZ);

   WRITE_RECORD( ctx, ctx->Select.NameStackDepth );
   WRITE_RECORD( ctx, zmin );
   WRITE_RECORD( ctx, zmax );
   for (i = 0; i < ctx->Select.NameStackDepth; i++) {
      WRITE_RECORD( ctx, ctx->Select.NameStack[i] );
   }

   ctx->Select.Hits++;
   ctx->Select.HitFlag = GL_FALSE;
   ctx->Select.HitMinZ = 1.0;
   ctx->Select.HitMaxZ = -1.0;
}



void
_mesa_InitNames( void )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);

   /* Record the hit before the HitFlag is wiped out again. */
   if (ctx->RenderMode == GL_SELECT) {
      if (ctx->Select.HitFlag) {
         write_hit_record( ctx );
      }
   }
   ctx->Select.NameStackDepth = 0;
   ctx->Select.HitFlag = GL_FALSE;
   ctx->Select.HitMinZ = 1.0;
   ctx->Select.HitMaxZ = 0.0;
   ctx->NewState |= _NEW_RENDERMODE;
}



void
_mesa_LoadName( GLuint name )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->RenderMode != GL_SELECT) {
      return;
   }
   if (ctx->Select.NameStackDepth == 0) {
      gl_error( ctx, GL_INVALID_OPERATION, "glLoadName" );
      return;
   }

   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);

   if (ctx->Select.HitFlag) {
      write_hit_record( ctx );
   }
   if (ctx->Select.NameStackDepth < MAX_NAME_STACK_DEPTH) {
      ctx->Select.NameStack[ctx->Select.NameStackDepth-1] = name;
   }
   else {
      ctx->Select.NameStack[MAX_NAME_STACK_DEPTH-1] = name;
   }
}


void
_mesa_PushName( GLuint name )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->RenderMode != GL_SELECT) {
      return;
   }

   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
   if (ctx->Select.HitFlag) {
      write_hit_record( ctx );
   }
   if (ctx->Select.NameStackDepth >= MAX_NAME_STACK_DEPTH) {
      gl_error( ctx, GL_STACK_OVERFLOW, "glPushName" );
   }
   else
      ctx->Select.NameStack[ctx->Select.NameStackDepth++] = name;
}



void
_mesa_PopName( void )
{
   GET_CURRENT_CONTEXT(ctx);
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (ctx->RenderMode != GL_SELECT) {
      return;
   }

   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
   if (ctx->Select.HitFlag) {
      write_hit_record( ctx );
   }
   if (ctx->Select.NameStackDepth == 0) {
      gl_error( ctx, GL_STACK_UNDERFLOW, "glPopName" );
   }
   else
      ctx->Select.NameStackDepth--;
}



/**********************************************************************/
/*                           Render Mode                              */
/**********************************************************************/



/*
 * NOTE: this function can't be put in a display list.
 */
GLint
_mesa_RenderMode( GLenum mode )
{
   GET_CURRENT_CONTEXT(ctx);
   GLint result;
   ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);

   if (MESA_VERBOSE & VERBOSE_API)
      fprintf(stderr, "glRenderMode %s\n", gl_lookup_enum_by_nr(mode));

   FLUSH_VERTICES(ctx, _NEW_RENDERMODE);
   ctx->_TriangleCaps &= ~(DD_FEEDBACK|DD_SELECT);

   switch (ctx->RenderMode) {
      case GL_RENDER:
	 result = 0;
	 break;
      case GL_SELECT:
	 if (ctx->Select.HitFlag) {
	    write_hit_record( ctx );
	 }
	 if (ctx->Select.BufferCount > ctx->Select.BufferSize) {
	    /* overflow */
#ifdef DEBUG
            _mesa_warning(ctx, "Feedback buffer overflow");
#endif
	    result = -1;
	 }
	 else {
	    result = ctx->Select.Hits;
	 }
	 ctx->Select.BufferCount = 0;
	 ctx->Select.Hits = 0;
	 ctx->Select.NameStackDepth = 0;
	 break;
      case GL_FEEDBACK:
	 if (ctx->Feedback.Count > ctx->Feedback.BufferSize) {
	    /* overflow */
	    result = -1;
	 }
	 else {
	    result = ctx->Feedback.Count;
	 }
	 ctx->Feedback.Count = 0;
	 break;
      default:
	 gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
	 return 0;
   }

   switch (mode) {
      case GL_RENDER:
         break;
      case GL_SELECT:
	 ctx->_TriangleCaps |= DD_SELECT;
	 if (ctx->Select.BufferSize==0) {
	    /* haven't called glSelectBuffer yet */
	    gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
	 }
	 break;
      case GL_FEEDBACK:
	 ctx->_TriangleCaps |= DD_FEEDBACK;
	 if (ctx->Feedback.BufferSize==0) {
	    /* haven't called glFeedbackBuffer yet */
	    gl_error( ctx, GL_INVALID_OPERATION, "glRenderMode" );
	 }
	 break;
      default:
	 gl_error( ctx, GL_INVALID_ENUM, "glRenderMode" );
	 return 0;
   }

   ctx->RenderMode = mode;
   if (ctx->Driver.RenderMode) 
      ctx->Driver.RenderMode( ctx, mode );

   return result;
}