1 /**************************************************************************
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
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 TUNGSTEN GRAPHICS 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 **************************************************************************/
28 /* Authors: Keith Whitwell <keith@tungstengraphics.com>
31 #include "pipe/p_util.h"
32 #include "pipe/p_defines.h"
33 #include "draw_private.h"
35 static boolean
points( unsigned prim
)
37 return (prim
== PIPE_PRIM_POINTS
);
40 static boolean
lines( unsigned prim
)
42 return (prim
== PIPE_PRIM_LINES
||
43 prim
== PIPE_PRIM_LINE_STRIP
||
44 prim
== PIPE_PRIM_LINE_LOOP
);
47 static boolean
triangles( unsigned prim
)
49 return prim
>= PIPE_PRIM_TRIANGLES
;
53 * Check if we need any special pipeline stages, or whether
54 * prims/verts can go through untouched. Don't test for bypass
55 * clipping or vs modes, this function is just about the primitive
59 draw_need_pipeline(const struct draw_context
*draw
,
62 /* Don't have to worry about triangles turning into lines/points
63 * and triggering the pipeline, because we have to trigger the
64 * pipeline *anyway* if unfilled mode is active.
69 if (draw
->rasterizer
->line_stipple_enable
&& draw
->line_stipple
)
73 if (draw
->rasterizer
->line_width
> draw
->wide_line_threshold
)
77 if (draw
->rasterizer
->line_smooth
&& draw
->pipeline
.aaline
)
80 /* first-vertex driven flatshading */
81 if (draw
->rasterizer
->flatshade
&& draw
->rasterizer
->flatshade_first
)
88 if (draw
->rasterizer
->point_size
> draw
->wide_point_threshold
)
92 if (draw
->rasterizer
->point_smooth
&& draw
->pipeline
.aapoint
)
96 if (draw
->rasterizer
->point_sprite
&& draw
->point_sprite
)
103 /* polygon stipple */
104 if (draw
->rasterizer
->poly_stipple_enable
&& draw
->pipeline
.pstipple
)
107 /* unfilled polygons */
108 if (draw
->rasterizer
->fill_cw
!= PIPE_POLYGON_MODE_FILL
||
109 draw
->rasterizer
->fill_ccw
!= PIPE_POLYGON_MODE_FILL
)
113 if (draw
->rasterizer
->offset_cw
|| draw
->rasterizer
->offset_ccw
)
116 /* two-side lighting */
117 if (draw
->rasterizer
->light_twoside
)
120 /* first-vertex driven flatshading */
121 if (draw
->rasterizer
->flatshade
&& draw
->rasterizer
->flatshade_first
)
125 /* polygon cull - this is difficult - hardware can cull just fine
126 * most of the time (though sometimes CULL_NEITHER is unsupported.
128 * Generally this isn't a reason to require the pipeline, though.
130 if (draw->rasterizer->cull_mode)
140 * Rebuild the rendering pipeline.
142 static struct draw_stage
*validate_pipeline( struct draw_stage
*stage
)
144 struct draw_context
*draw
= stage
->draw
;
145 struct draw_stage
*next
= draw
->pipeline
.rasterize
;
147 int precalc_flat
= 0;
148 boolean wide_lines
, wide_points
;
150 /* Set the validate's next stage to the rasterize stage, so that it
151 * can be found later if needed for flushing.
155 /* drawing wide lines? */
156 wide_lines
= (draw
->rasterizer
->line_width
> draw
->wide_line_threshold
157 && !draw
->rasterizer
->line_smooth
);
159 /* drawing large points? */
160 if (draw
->rasterizer
->point_sprite
&& draw
->point_sprite
)
162 else if (draw
->rasterizer
->point_smooth
&& draw
->pipeline
.aapoint
)
164 else if (draw
->rasterizer
->point_size
> draw
->wide_point_threshold
)
170 * NOTE: we build up the pipeline in end-to-start order.
172 * TODO: make the current primitive part of the state and build
173 * shorter pipelines for lines & points.
176 if (draw
->rasterizer
->line_smooth
&& draw
->pipeline
.aaline
) {
177 draw
->pipeline
.aaline
->next
= next
;
178 next
= draw
->pipeline
.aaline
;
181 if (draw
->rasterizer
->point_smooth
&& draw
->pipeline
.aapoint
) {
182 draw
->pipeline
.aapoint
->next
= next
;
183 next
= draw
->pipeline
.aapoint
;
187 draw
->pipeline
.wide_line
->next
= next
;
188 next
= draw
->pipeline
.wide_line
;
192 if (wide_points
|| draw
->rasterizer
->point_sprite
) {
193 draw
->pipeline
.wide_point
->next
= next
;
194 next
= draw
->pipeline
.wide_point
;
197 if (draw
->rasterizer
->line_stipple_enable
&& draw
->line_stipple
) {
198 draw
->pipeline
.stipple
->next
= next
;
199 next
= draw
->pipeline
.stipple
;
200 precalc_flat
= 1; /* only needed for lines really */
203 if (draw
->rasterizer
->poly_stipple_enable
204 && draw
->pipeline
.pstipple
) {
205 draw
->pipeline
.pstipple
->next
= next
;
206 next
= draw
->pipeline
.pstipple
;
209 if (draw
->rasterizer
->fill_cw
!= PIPE_POLYGON_MODE_FILL
||
210 draw
->rasterizer
->fill_ccw
!= PIPE_POLYGON_MODE_FILL
) {
211 draw
->pipeline
.unfilled
->next
= next
;
212 next
= draw
->pipeline
.unfilled
;
213 precalc_flat
= 1; /* only needed for triangles really */
217 if (draw
->rasterizer
->flatshade
&& precalc_flat
) {
218 draw
->pipeline
.flatshade
->next
= next
;
219 next
= draw
->pipeline
.flatshade
;
222 if (draw
->rasterizer
->offset_cw
||
223 draw
->rasterizer
->offset_ccw
) {
224 draw
->pipeline
.offset
->next
= next
;
225 next
= draw
->pipeline
.offset
;
229 if (draw
->rasterizer
->light_twoside
) {
230 draw
->pipeline
.twoside
->next
= next
;
231 next
= draw
->pipeline
.twoside
;
235 /* Always run the cull stage as we calculate determinant there
238 * This can actually be a win as culling out the triangles can lead
239 * to less work emitting vertices, smaller vertex buffers, etc.
240 * It's difficult to say whether this will be true in general.
242 if (need_det
|| draw
->rasterizer
->cull_mode
) {
243 draw
->pipeline
.cull
->next
= next
;
244 next
= draw
->pipeline
.cull
;
249 if (!draw
->rasterizer
->bypass_clipping
)
251 draw
->pipeline
.clip
->next
= next
;
252 next
= draw
->pipeline
.clip
;
256 draw
->pipeline
.first
= next
;
260 static void validate_tri( struct draw_stage
*stage
,
261 struct prim_header
*header
)
263 struct draw_stage
*pipeline
= validate_pipeline( stage
);
264 pipeline
->tri( pipeline
, header
);
267 static void validate_line( struct draw_stage
*stage
,
268 struct prim_header
*header
)
270 struct draw_stage
*pipeline
= validate_pipeline( stage
);
271 pipeline
->line( pipeline
, header
);
274 static void validate_point( struct draw_stage
*stage
,
275 struct prim_header
*header
)
277 struct draw_stage
*pipeline
= validate_pipeline( stage
);
278 pipeline
->point( pipeline
, header
);
281 static void validate_reset_stipple_counter( struct draw_stage
*stage
)
283 struct draw_stage
*pipeline
= validate_pipeline( stage
);
284 pipeline
->reset_stipple_counter( pipeline
);
287 static void validate_flush( struct draw_stage
*stage
,
290 /* May need to pass a backend flush on to the rasterize stage.
293 stage
->next
->flush( stage
->next
, flags
);
297 static void validate_destroy( struct draw_stage
*stage
)
304 * Create validate pipeline stage.
306 struct draw_stage
*draw_validate_stage( struct draw_context
*draw
)
308 struct draw_stage
*stage
= CALLOC_STRUCT(draw_stage
);
312 stage
->point
= validate_point
;
313 stage
->line
= validate_line
;
314 stage
->tri
= validate_tri
;
315 stage
->flush
= validate_flush
;
316 stage
->reset_stipple_counter
= validate_reset_stipple_counter
;
317 stage
->destroy
= validate_destroy
;