summaryrefslogtreecommitdiff
path: root/src/mesa/state_tracker/st_cb_feedback.c
blob: 31744151f1d84759249e1d7c6527fd65b198148e (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
/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
 * 
 **************************************************************************/

/**
 * GL_SELECT and GL_FEEDBACK render modes.
 * Basically, we use a private instance of the 'draw' module for doing
 * selection/feedback.  It would be nice to use the transform_feedback
 * hardware feature, but it's defined as happening pre-clip and we want
 * post-clipped primitives.  Also, there's concerns about the efficiency
 * of using the hardware for this anyway.
 *
 * Authors:
 *   Brian Paul
 */

#include "main/imports.h"
#include "main/context.h"
#include "main/feedback.h"
#include "main/macros.h"

#include "vbo/vbo.h"

#include "st_context.h"
#include "st_atom.h"
#include "st_draw.h"
#include "st_cb_feedback.h"
#include "st_cb_bufferobjects.h"

#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "pipe/p_winsys.h"
#include "pipe/cso_cache/cso_cache.h"

#include "pipe/draw/draw_context.h"
#include "pipe/draw/draw_private.h"


/**
 * This is actually used for both feedback and selection.
 */
struct feedback_stage
{
   struct draw_stage stage;   /**< Base class */
   GLcontext *ctx;            /**< Rendering context */
   GLboolean reset_stipple_counter;
};


/**********************************************************************
 * GL Feedback functions
 **********************************************************************/

static INLINE struct feedback_stage *
feedback_stage( struct draw_stage *stage )
{
   return (struct feedback_stage *)stage;
}


static void
feedback_vertex(GLcontext *ctx, const struct draw_context *draw,
                const struct vertex_header *v)
{
   const struct st_context *st = ctx->st;
   GLfloat win[4];
   const GLfloat *color, *texcoord;
   const GLfloat ci = 0;
   GLuint slot;

   /* Recall that Y=0=Top of window for Gallium wincoords */
   win[0] = v->data[0][0];
   win[1] = ctx->DrawBuffer->Height - v->data[0][1];
   win[2] = v->data[0][2];
   win[3] = 1.0F / v->data[0][3];

   /* XXX
    * When we compute vertex layout, save info about position of the
    * color and texcoord attribs to use here.
    */

   slot = st->vertex_result_to_slot[VERT_RESULT_COL0];
   if (slot != ~0U)
      color = v->data[slot];
   else
      color = ctx->Current.Attrib[VERT_ATTRIB_COLOR0];

   slot = st->vertex_result_to_slot[VERT_RESULT_TEX0];
   if (slot != ~0U)
      texcoord = v->data[slot];
   else
      texcoord = ctx->Current.Attrib[VERT_ATTRIB_TEX0];

   _mesa_feedback_vertex(ctx, win, color, ci, texcoord);
}


static void
feedback_tri( struct draw_stage *stage, struct prim_header *prim )
{
   struct feedback_stage *fs = feedback_stage(stage);
   struct draw_context *draw = stage->draw;
   FEEDBACK_TOKEN(fs->ctx, (GLfloat) GL_POLYGON_TOKEN);
   FEEDBACK_TOKEN(fs->ctx, (GLfloat) 3); /* three vertices */
   feedback_vertex(fs->ctx, draw, prim->v[0]);
   feedback_vertex(fs->ctx, draw, prim->v[1]);
   feedback_vertex(fs->ctx, draw, prim->v[2]);
}


static void
feedback_line( struct draw_stage *stage, struct prim_header *prim )
{
   struct feedback_stage *fs = feedback_stage(stage);
   struct draw_context *draw = stage->draw;
   if (fs->reset_stipple_counter) {
      FEEDBACK_TOKEN(fs->ctx, (GLfloat) GL_LINE_RESET_TOKEN);
      fs->reset_stipple_counter = GL_FALSE;
   }
   else {
      FEEDBACK_TOKEN(fs->ctx, (GLfloat) GL_LINE_TOKEN);
   }
   feedback_vertex(fs->ctx, draw, prim->v[0]);
   feedback_vertex(fs->ctx, draw, prim->v[1]);
}


static void
feedback_point( struct draw_stage *stage, struct prim_header *prim )
{
   struct feedback_stage *fs = feedback_stage(stage);
   struct draw_context *draw = stage->draw;
   FEEDBACK_TOKEN(fs->ctx, (GLfloat) GL_POINT_TOKEN);
   feedback_vertex(fs->ctx, draw, prim->v[0]);
}


static void
feedback_flush( struct draw_stage *stage, unsigned flags )
{
   /* no-op */
}


static void
feedback_reset_stipple_counter( struct draw_stage *stage )
{
   struct feedback_stage *fs = feedback_stage(stage);
   fs->reset_stipple_counter = GL_TRUE;
}


/**
 * Create GL feedback drawing stage.
 */
static struct draw_stage *
draw_glfeedback_stage(GLcontext *ctx, struct draw_context *draw)
{
   struct feedback_stage *fs = CALLOC_STRUCT(feedback_stage);

   fs->stage.draw = draw;
   fs->stage.next = NULL;
   fs->stage.point = feedback_point;
   fs->stage.line = feedback_line;
   fs->stage.tri = feedback_tri;
   fs->stage.flush = feedback_flush;
   fs->stage.reset_stipple_counter = feedback_reset_stipple_counter;
   fs->ctx = ctx;

   return &fs->stage;
}



/**********************************************************************
 * GL Selection functions
 **********************************************************************/

static void
select_tri( struct draw_stage *stage, struct prim_header *prim )
{
   struct feedback_stage *fs = feedback_stage(stage);
   _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] );
   _mesa_update_hitflag( fs->ctx, prim->v[1]->data[0][2] );
   _mesa_update_hitflag( fs->ctx, prim->v[2]->data[0][2] );
}

static void
select_line( struct draw_stage *stage, struct prim_header *prim )
{
   struct feedback_stage *fs = feedback_stage(stage);
   _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] );
   _mesa_update_hitflag( fs->ctx, prim->v[1]->data[0][2] );
}


static void
select_point( struct draw_stage *stage, struct prim_header *prim )
{
   struct feedback_stage *fs = feedback_stage(stage);
   _mesa_update_hitflag( fs->ctx, prim->v[0]->data[0][2] );
}


static void
select_flush( struct draw_stage *stage, unsigned flags )
{
   /* no-op */
}


static void
select_reset_stipple_counter( struct draw_stage *stage )
{
   /* no-op */
}


/**
 * Create GL selection mode drawing stage.
 */
static struct draw_stage *
draw_glselect_stage(GLcontext *ctx, struct draw_context *draw)
{
   struct feedback_stage *fs = CALLOC_STRUCT(feedback_stage);

   fs->stage.draw = draw;
   fs->stage.next = NULL;
   fs->stage.point = select_point;
   fs->stage.line = select_line;
   fs->stage.tri = select_tri;
   fs->stage.flush = select_flush;
   fs->stage.reset_stipple_counter = select_reset_stipple_counter;
   fs->ctx = ctx;

   return &fs->stage;
}


static void
st_RenderMode(GLcontext *ctx, GLenum newMode )
{
   struct st_context *st = ctx->st;
   struct draw_context *draw = st->draw;

   if (newMode == GL_RENDER) {
      /* restore normal VBO draw function */
      vbo_set_draw_func(ctx, st_draw_vbo);
   }
   else if (newMode == GL_SELECT) {
      if (!st->selection_stage)
         st->selection_stage = draw_glselect_stage(ctx, draw);
      draw_set_rasterize_stage(draw, st->selection_stage);
      /* Plug in new vbo draw function */
      vbo_set_draw_func(ctx, st_feedback_draw_vbo);
   }
   else {
      if (!st->feedback_stage)
         st->feedback_stage = draw_glfeedback_stage(ctx, draw);
      draw_set_rasterize_stage(draw, st->feedback_stage);
      /* Plug in new vbo draw function */
      vbo_set_draw_func(ctx, st_feedback_draw_vbo);
      /* need to generate/use a vertex program that emits pos/color/tex */
      st->dirty.st |= ST_NEW_VERTEX_PROGRAM;
   }
}



void st_init_feedback_functions(struct dd_function_table *functions)
{
   functions->RenderMode = st_RenderMode;
}