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 "util/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"
53 #include "pipe/p_context.h"
54 #include "pipe/p_defines.h"
56 #include "draw/draw_context.h"
57 #include "draw/draw_pipe.h"
61 * This is actually used for both feedback and selection.
65 struct draw_stage stage
; /**< Base class */
66 struct gl_context
*ctx
; /**< Rendering context */
67 GLboolean reset_stipple_counter
;
71 /**********************************************************************
72 * GL Feedback functions
73 **********************************************************************/
75 static inline struct feedback_stage
*
76 feedback_stage( struct draw_stage
*stage
)
78 return (struct feedback_stage
*)stage
;
83 feedback_vertex(struct gl_context
*ctx
, const struct draw_context
*draw
,
84 const struct vertex_header
*v
)
86 const struct st_context
*st
= st_context(ctx
);
87 struct st_vertex_program
*stvp
= (struct st_vertex_program
*)st
->vp
;
89 const GLfloat
*color
, *texcoord
;
92 win
[0] = v
->data
[0][0];
93 if (st_fb_orientation(ctx
->DrawBuffer
) == Y_0_TOP
)
94 win
[1] = ctx
->DrawBuffer
->Height
- v
->data
[0][1];
96 win
[1] = v
->data
[0][1];
97 win
[2] = v
->data
[0][2];
98 win
[3] = 1.0F
/ v
->data
[0][3];
101 * When we compute vertex layout, save info about position of the
102 * color and texcoord attribs to use here.
105 slot
= stvp
->result_to_output
[VARYING_SLOT_COL0
];
107 color
= v
->data
[slot
];
109 color
= ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR0
];
111 slot
= stvp
->result_to_output
[VARYING_SLOT_TEX0
];
113 texcoord
= v
->data
[slot
];
115 texcoord
= ctx
->Current
.Attrib
[VERT_ATTRIB_TEX0
];
117 _mesa_feedback_vertex(ctx
, win
, color
, texcoord
);
122 feedback_tri( struct draw_stage
*stage
, struct prim_header
*prim
)
124 struct feedback_stage
*fs
= feedback_stage(stage
);
125 struct draw_context
*draw
= stage
->draw
;
126 _mesa_feedback_token(fs
->ctx
, (GLfloat
) GL_POLYGON_TOKEN
);
127 _mesa_feedback_token(fs
->ctx
, (GLfloat
) 3); /* three vertices */
128 feedback_vertex(fs
->ctx
, draw
, prim
->v
[0]);
129 feedback_vertex(fs
->ctx
, draw
, prim
->v
[1]);
130 feedback_vertex(fs
->ctx
, draw
, prim
->v
[2]);
135 feedback_line( struct draw_stage
*stage
, struct prim_header
*prim
)
137 struct feedback_stage
*fs
= feedback_stage(stage
);
138 struct draw_context
*draw
= stage
->draw
;
139 if (fs
->reset_stipple_counter
) {
140 _mesa_feedback_token(fs
->ctx
, (GLfloat
) GL_LINE_RESET_TOKEN
);
141 fs
->reset_stipple_counter
= GL_FALSE
;
144 _mesa_feedback_token(fs
->ctx
, (GLfloat
) GL_LINE_TOKEN
);
146 feedback_vertex(fs
->ctx
, draw
, prim
->v
[0]);
147 feedback_vertex(fs
->ctx
, draw
, prim
->v
[1]);
152 feedback_point( struct draw_stage
*stage
, struct prim_header
*prim
)
154 struct feedback_stage
*fs
= feedback_stage(stage
);
155 struct draw_context
*draw
= stage
->draw
;
156 _mesa_feedback_token(fs
->ctx
, (GLfloat
) GL_POINT_TOKEN
);
157 feedback_vertex(fs
->ctx
, draw
, prim
->v
[0]);
162 feedback_flush( struct draw_stage
*stage
, unsigned flags
)
169 feedback_reset_stipple_counter( struct draw_stage
*stage
)
171 struct feedback_stage
*fs
= feedback_stage(stage
);
172 fs
->reset_stipple_counter
= GL_TRUE
;
177 feedback_destroy( struct draw_stage
*stage
)
183 * Create GL feedback drawing stage.
185 static struct draw_stage
*
186 draw_glfeedback_stage(struct gl_context
*ctx
, struct draw_context
*draw
)
188 struct feedback_stage
*fs
= ST_CALLOC_STRUCT(feedback_stage
);
190 fs
->stage
.draw
= draw
;
191 fs
->stage
.next
= NULL
;
192 fs
->stage
.point
= feedback_point
;
193 fs
->stage
.line
= feedback_line
;
194 fs
->stage
.tri
= feedback_tri
;
195 fs
->stage
.flush
= feedback_flush
;
196 fs
->stage
.reset_stipple_counter
= feedback_reset_stipple_counter
;
197 fs
->stage
.destroy
= feedback_destroy
;
205 /**********************************************************************
206 * GL Selection functions
207 **********************************************************************/
210 select_tri( struct draw_stage
*stage
, struct prim_header
*prim
)
212 struct feedback_stage
*fs
= feedback_stage(stage
);
213 _mesa_update_hitflag( fs
->ctx
, prim
->v
[0]->data
[0][2] );
214 _mesa_update_hitflag( fs
->ctx
, prim
->v
[1]->data
[0][2] );
215 _mesa_update_hitflag( fs
->ctx
, prim
->v
[2]->data
[0][2] );
219 select_line( struct draw_stage
*stage
, struct prim_header
*prim
)
221 struct feedback_stage
*fs
= feedback_stage(stage
);
222 _mesa_update_hitflag( fs
->ctx
, prim
->v
[0]->data
[0][2] );
223 _mesa_update_hitflag( fs
->ctx
, prim
->v
[1]->data
[0][2] );
228 select_point( struct draw_stage
*stage
, struct prim_header
*prim
)
230 struct feedback_stage
*fs
= feedback_stage(stage
);
231 _mesa_update_hitflag( fs
->ctx
, prim
->v
[0]->data
[0][2] );
236 select_flush( struct draw_stage
*stage
, unsigned flags
)
243 select_reset_stipple_counter( struct draw_stage
*stage
)
249 select_destroy( struct draw_stage
*stage
)
256 * Create GL selection mode drawing stage.
258 static struct draw_stage
*
259 draw_glselect_stage(struct gl_context
*ctx
, struct draw_context
*draw
)
261 struct feedback_stage
*fs
= ST_CALLOC_STRUCT(feedback_stage
);
263 fs
->stage
.draw
= draw
;
264 fs
->stage
.next
= NULL
;
265 fs
->stage
.point
= select_point
;
266 fs
->stage
.line
= select_line
;
267 fs
->stage
.tri
= select_tri
;
268 fs
->stage
.flush
= select_flush
;
269 fs
->stage
.reset_stipple_counter
= select_reset_stipple_counter
;
270 fs
->stage
.destroy
= select_destroy
;
278 st_RenderMode(struct gl_context
*ctx
, GLenum newMode
)
280 struct st_context
*st
= st_context(ctx
);
281 struct draw_context
*draw
= st_get_draw_context(st
);
286 if (newMode
== GL_RENDER
) {
287 /* restore normal VBO draw function */
288 st_init_draw_functions(&ctx
->Driver
);
290 else if (newMode
== GL_SELECT
) {
291 if (!st
->selection_stage
)
292 st
->selection_stage
= draw_glselect_stage(ctx
, draw
);
293 draw_set_rasterize_stage(draw
, st
->selection_stage
);
294 /* Plug in new vbo draw function */
295 ctx
->Driver
.Draw
= st_feedback_draw_vbo
;
298 struct gl_program
*vp
= st
->ctx
->VertexProgram
._Current
;
300 if (!st
->feedback_stage
)
301 st
->feedback_stage
= draw_glfeedback_stage(ctx
, draw
);
302 draw_set_rasterize_stage(draw
, st
->feedback_stage
);
303 /* Plug in new vbo draw function */
304 ctx
->Driver
.Draw
= st_feedback_draw_vbo
;
305 /* need to generate/use a vertex program that emits pos/color/tex */
307 st
->dirty
|= ST_NEW_VERTEX_PROGRAM(st
, st_program(vp
));
313 void st_init_feedback_functions(struct dd_function_table
*functions
)
315 functions
->RenderMode
= st_RenderMode
;