1 /**************************************************************************
3 * Copyright 2007 VMware, Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
29 * GL_SELECT and GL_FEEDBACK render modes.
30 * Basically, we use a private instance of the 'draw' module for doing
31 * selection/feedback. It would be nice to use the transform_feedback
32 * hardware feature, but it's defined as happening pre-clip and we want
33 * post-clipped primitives. Also, there's concerns about the efficiency
34 * of using the hardware for this anyway.
40 #include "main/imports.h"
41 #include "main/context.h"
42 #include "main/feedback.h"
43 #include "main/varray.h"
47 #include "st_context.h"
49 #include "st_cb_feedback.h"
50 #include "st_program.h"
52 #include "pipe/p_context.h"
53 #include "pipe/p_defines.h"
55 #include "draw/draw_context.h"
56 #include "draw/draw_pipe.h"
60 * This is actually used for both feedback and selection.
64 struct draw_stage stage
; /**< Base class */
65 struct gl_context
*ctx
; /**< Rendering context */
66 GLboolean reset_stipple_counter
;
70 /**********************************************************************
71 * GL Feedback functions
72 **********************************************************************/
74 static inline struct feedback_stage
*
75 feedback_stage( struct draw_stage
*stage
)
77 return (struct feedback_stage
*)stage
;
82 feedback_vertex(struct gl_context
*ctx
, const struct draw_context
*draw
,
83 const struct vertex_header
*v
)
85 const struct st_context
*st
= st_context(ctx
);
87 const GLfloat
*color
, *texcoord
;
90 win
[0] = v
->data
[0][0];
91 if (st_fb_orientation(ctx
->DrawBuffer
) == Y_0_TOP
)
92 win
[1] = ctx
->DrawBuffer
->Height
- v
->data
[0][1];
94 win
[1] = v
->data
[0][1];
95 win
[2] = v
->data
[0][2];
96 win
[3] = 1.0F
/ v
->data
[0][3];
99 * When we compute vertex layout, save info about position of the
100 * color and texcoord attribs to use here.
103 slot
= st
->vp
->result_to_output
[VARYING_SLOT_COL0
];
105 color
= v
->data
[slot
];
107 color
= ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR0
];
109 slot
= st
->vp
->result_to_output
[VARYING_SLOT_TEX0
];
111 texcoord
= v
->data
[slot
];
113 texcoord
= ctx
->Current
.Attrib
[VERT_ATTRIB_TEX0
];
115 _mesa_feedback_vertex(ctx
, win
, color
, texcoord
);
120 feedback_tri( struct draw_stage
*stage
, struct prim_header
*prim
)
122 struct feedback_stage
*fs
= feedback_stage(stage
);
123 struct draw_context
*draw
= stage
->draw
;
124 _mesa_feedback_token(fs
->ctx
, (GLfloat
) GL_POLYGON_TOKEN
);
125 _mesa_feedback_token(fs
->ctx
, (GLfloat
) 3); /* three vertices */
126 feedback_vertex(fs
->ctx
, draw
, prim
->v
[0]);
127 feedback_vertex(fs
->ctx
, draw
, prim
->v
[1]);
128 feedback_vertex(fs
->ctx
, draw
, prim
->v
[2]);
133 feedback_line( struct draw_stage
*stage
, struct prim_header
*prim
)
135 struct feedback_stage
*fs
= feedback_stage(stage
);
136 struct draw_context
*draw
= stage
->draw
;
137 if (fs
->reset_stipple_counter
) {
138 _mesa_feedback_token(fs
->ctx
, (GLfloat
) GL_LINE_RESET_TOKEN
);
139 fs
->reset_stipple_counter
= GL_FALSE
;
142 _mesa_feedback_token(fs
->ctx
, (GLfloat
) GL_LINE_TOKEN
);
144 feedback_vertex(fs
->ctx
, draw
, prim
->v
[0]);
145 feedback_vertex(fs
->ctx
, draw
, prim
->v
[1]);
150 feedback_point( struct draw_stage
*stage
, struct prim_header
*prim
)
152 struct feedback_stage
*fs
= feedback_stage(stage
);
153 struct draw_context
*draw
= stage
->draw
;
154 _mesa_feedback_token(fs
->ctx
, (GLfloat
) GL_POINT_TOKEN
);
155 feedback_vertex(fs
->ctx
, draw
, prim
->v
[0]);
160 feedback_flush( struct draw_stage
*stage
, unsigned flags
)
167 feedback_reset_stipple_counter( struct draw_stage
*stage
)
169 struct feedback_stage
*fs
= feedback_stage(stage
);
170 fs
->reset_stipple_counter
= GL_TRUE
;
175 feedback_destroy( struct draw_stage
*stage
)
181 * Create GL feedback drawing stage.
183 static struct draw_stage
*
184 draw_glfeedback_stage(struct gl_context
*ctx
, struct draw_context
*draw
)
186 struct feedback_stage
*fs
= ST_CALLOC_STRUCT(feedback_stage
);
188 fs
->stage
.draw
= draw
;
189 fs
->stage
.next
= NULL
;
190 fs
->stage
.point
= feedback_point
;
191 fs
->stage
.line
= feedback_line
;
192 fs
->stage
.tri
= feedback_tri
;
193 fs
->stage
.flush
= feedback_flush
;
194 fs
->stage
.reset_stipple_counter
= feedback_reset_stipple_counter
;
195 fs
->stage
.destroy
= feedback_destroy
;
203 /**********************************************************************
204 * GL Selection functions
205 **********************************************************************/
208 select_tri( struct draw_stage
*stage
, struct prim_header
*prim
)
210 struct feedback_stage
*fs
= feedback_stage(stage
);
211 _mesa_update_hitflag( fs
->ctx
, prim
->v
[0]->data
[0][2] );
212 _mesa_update_hitflag( fs
->ctx
, prim
->v
[1]->data
[0][2] );
213 _mesa_update_hitflag( fs
->ctx
, prim
->v
[2]->data
[0][2] );
217 select_line( struct draw_stage
*stage
, struct prim_header
*prim
)
219 struct feedback_stage
*fs
= feedback_stage(stage
);
220 _mesa_update_hitflag( fs
->ctx
, prim
->v
[0]->data
[0][2] );
221 _mesa_update_hitflag( fs
->ctx
, prim
->v
[1]->data
[0][2] );
226 select_point( struct draw_stage
*stage
, struct prim_header
*prim
)
228 struct feedback_stage
*fs
= feedback_stage(stage
);
229 _mesa_update_hitflag( fs
->ctx
, prim
->v
[0]->data
[0][2] );
234 select_flush( struct draw_stage
*stage
, unsigned flags
)
241 select_reset_stipple_counter( struct draw_stage
*stage
)
247 select_destroy( struct draw_stage
*stage
)
254 * Create GL selection mode drawing stage.
256 static struct draw_stage
*
257 draw_glselect_stage(struct gl_context
*ctx
, struct draw_context
*draw
)
259 struct feedback_stage
*fs
= ST_CALLOC_STRUCT(feedback_stage
);
261 fs
->stage
.draw
= draw
;
262 fs
->stage
.next
= NULL
;
263 fs
->stage
.point
= select_point
;
264 fs
->stage
.line
= select_line
;
265 fs
->stage
.tri
= select_tri
;
266 fs
->stage
.flush
= select_flush
;
267 fs
->stage
.reset_stipple_counter
= select_reset_stipple_counter
;
268 fs
->stage
.destroy
= select_destroy
;
276 st_RenderMode(struct gl_context
*ctx
, GLenum newMode
)
278 struct st_context
*st
= st_context(ctx
);
279 struct draw_context
*draw
= st_get_draw_context(st
);
284 if (newMode
== GL_RENDER
) {
285 /* restore normal VBO draw function */
286 st_init_draw_functions(&ctx
->Driver
);
288 else if (newMode
== GL_SELECT
) {
289 if (!st
->selection_stage
)
290 st
->selection_stage
= draw_glselect_stage(ctx
, draw
);
291 draw_set_rasterize_stage(draw
, st
->selection_stage
);
292 /* Plug in new vbo draw function */
293 ctx
->Driver
.Draw
= st_feedback_draw_vbo
;
296 struct gl_program
*vp
= st
->ctx
->VertexProgram
._Current
;
298 if (!st
->feedback_stage
)
299 st
->feedback_stage
= draw_glfeedback_stage(ctx
, draw
);
300 draw_set_rasterize_stage(draw
, st
->feedback_stage
);
301 /* Plug in new vbo draw function */
302 ctx
->Driver
.Draw
= st_feedback_draw_vbo
;
303 /* need to generate/use a vertex program that emits pos/color/tex */
305 st
->dirty
|= ST_NEW_VERTEX_PROGRAM(st
, st_vertex_program(vp
));
311 void st_init_feedback_functions(struct dd_function_table
*functions
)
313 functions
->RenderMode
= st_RenderMode
;