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 "util/u_memory.h"
32 #include "pipe/p_defines.h"
33 #include "draw_private.h"
34 #include "draw_pipe.h"
35 #include "draw_context.h"
37 static boolean
points( unsigned prim
)
39 return (prim
== PIPE_PRIM_POINTS
);
42 static boolean
lines( unsigned prim
)
44 return (prim
== PIPE_PRIM_LINES
||
45 prim
== PIPE_PRIM_LINE_STRIP
||
46 prim
== PIPE_PRIM_LINE_LOOP
);
49 static boolean
triangles( unsigned prim
)
51 return prim
>= PIPE_PRIM_TRIANGLES
;
55 * Check if we need any special pipeline stages, or whether
56 * prims/verts can go through untouched. Don't test for bypass
57 * clipping or vs modes, this function is just about the primitive
61 draw_need_pipeline(const struct draw_context
*draw
,
62 const struct pipe_rasterizer_state
*rasterizer
,
65 /* Don't have to worry about triangles turning into lines/points
66 * and triggering the pipeline, because we have to trigger the
67 * pipeline *anyway* if unfilled mode is active.
72 if (rasterizer
->line_stipple_enable
&& draw
->pipeline
.line_stipple
)
76 if (rasterizer
->line_width
> draw
->pipeline
.wide_line_threshold
)
80 if (rasterizer
->line_smooth
&& draw
->pipeline
.aaline
)
87 if (rasterizer
->point_size
> draw
->pipeline
.wide_point_threshold
)
91 if (rasterizer
->point_smooth
&& draw
->pipeline
.aapoint
)
95 if (rasterizer
->point_sprite
&& draw
->pipeline
.point_sprite
)
102 /* polygon stipple */
103 if (rasterizer
->poly_stipple_enable
&& draw
->pipeline
.pstipple
)
106 /* unfilled polygons */
107 if (rasterizer
->fill_cw
!= PIPE_POLYGON_MODE_FILL
||
108 rasterizer
->fill_ccw
!= PIPE_POLYGON_MODE_FILL
)
112 if (rasterizer
->offset_cw
|| rasterizer
->offset_ccw
)
115 /* two-side lighting */
116 if (rasterizer
->light_twoside
)
120 /* polygon cull - this is difficult - hardware can cull just fine
121 * most of the time (though sometimes CULL_NEITHER is unsupported.
123 * Generally this isn't a reason to require the pipeline, though.
125 if (rasterizer->cull_mode)
135 * Rebuild the rendering pipeline.
137 static struct draw_stage
*validate_pipeline( struct draw_stage
*stage
)
139 struct draw_context
*draw
= stage
->draw
;
140 struct draw_stage
*next
= draw
->pipeline
.rasterize
;
142 int precalc_flat
= 0;
143 boolean wide_lines
, wide_points
;
145 /* Set the validate's next stage to the rasterize stage, so that it
146 * can be found later if needed for flushing.
150 /* drawing wide lines? */
151 wide_lines
= (draw
->rasterizer
->line_width
> draw
->pipeline
.wide_line_threshold
152 && !draw
->rasterizer
->line_smooth
);
154 /* drawing large points? */
155 if (draw
->rasterizer
->point_sprite
&& draw
->pipeline
.point_sprite
)
157 else if (draw
->rasterizer
->point_smooth
&& draw
->pipeline
.aapoint
)
159 else if (draw
->rasterizer
->point_size
> draw
->pipeline
.wide_point_threshold
)
165 * NOTE: we build up the pipeline in end-to-start order.
167 * TODO: make the current primitive part of the state and build
168 * shorter pipelines for lines & points.
171 if (draw
->rasterizer
->line_smooth
&& draw
->pipeline
.aaline
) {
172 draw
->pipeline
.aaline
->next
= next
;
173 next
= draw
->pipeline
.aaline
;
176 if (draw
->rasterizer
->point_smooth
&& draw
->pipeline
.aapoint
) {
177 draw
->pipeline
.aapoint
->next
= next
;
178 next
= draw
->pipeline
.aapoint
;
182 draw
->pipeline
.wide_line
->next
= next
;
183 next
= draw
->pipeline
.wide_line
;
187 if (wide_points
|| draw
->rasterizer
->point_sprite
) {
188 draw
->pipeline
.wide_point
->next
= next
;
189 next
= draw
->pipeline
.wide_point
;
192 if (draw
->rasterizer
->line_stipple_enable
&& draw
->pipeline
.line_stipple
) {
193 draw
->pipeline
.stipple
->next
= next
;
194 next
= draw
->pipeline
.stipple
;
195 precalc_flat
= 1; /* only needed for lines really */
198 if (draw
->rasterizer
->poly_stipple_enable
199 && draw
->pipeline
.pstipple
) {
200 draw
->pipeline
.pstipple
->next
= next
;
201 next
= draw
->pipeline
.pstipple
;
204 if (draw
->rasterizer
->fill_cw
!= PIPE_POLYGON_MODE_FILL
||
205 draw
->rasterizer
->fill_ccw
!= PIPE_POLYGON_MODE_FILL
) {
206 draw
->pipeline
.unfilled
->next
= next
;
207 next
= draw
->pipeline
.unfilled
;
208 precalc_flat
= 1; /* only needed for triangles really */
212 if (draw
->rasterizer
->flatshade
&& precalc_flat
) {
213 draw
->pipeline
.flatshade
->next
= next
;
214 next
= draw
->pipeline
.flatshade
;
217 if (draw
->rasterizer
->offset_cw
||
218 draw
->rasterizer
->offset_ccw
) {
219 draw
->pipeline
.offset
->next
= next
;
220 next
= draw
->pipeline
.offset
;
224 if (draw
->rasterizer
->light_twoside
) {
225 draw
->pipeline
.twoside
->next
= next
;
226 next
= draw
->pipeline
.twoside
;
230 /* Always run the cull stage as we calculate determinant there
233 * This can actually be a win as culling out the triangles can lead
234 * to less work emitting vertices, smaller vertex buffers, etc.
235 * It's difficult to say whether this will be true in general.
237 if (need_det
|| draw
->rasterizer
->cull_mode
) {
238 draw
->pipeline
.cull
->next
= next
;
239 next
= draw
->pipeline
.cull
;
244 if (!draw
->bypass_clipping
)
246 draw
->pipeline
.clip
->next
= next
;
247 next
= draw
->pipeline
.clip
;
251 draw
->pipeline
.first
= next
;
255 static void validate_tri( struct draw_stage
*stage
,
256 struct prim_header
*header
)
258 struct draw_stage
*pipeline
= validate_pipeline( stage
);
259 pipeline
->tri( pipeline
, header
);
262 static void validate_line( struct draw_stage
*stage
,
263 struct prim_header
*header
)
265 struct draw_stage
*pipeline
= validate_pipeline( stage
);
266 pipeline
->line( pipeline
, header
);
269 static void validate_point( struct draw_stage
*stage
,
270 struct prim_header
*header
)
272 struct draw_stage
*pipeline
= validate_pipeline( stage
);
273 pipeline
->point( pipeline
, header
);
276 static void validate_reset_stipple_counter( struct draw_stage
*stage
)
278 struct draw_stage
*pipeline
= validate_pipeline( stage
);
279 pipeline
->reset_stipple_counter( pipeline
);
282 static void validate_flush( struct draw_stage
*stage
,
285 /* May need to pass a backend flush on to the rasterize stage.
288 stage
->next
->flush( stage
->next
, flags
);
292 static void validate_destroy( struct draw_stage
*stage
)
299 * Create validate pipeline stage.
301 struct draw_stage
*draw_validate_stage( struct draw_context
*draw
)
303 struct draw_stage
*stage
= CALLOC_STRUCT(draw_stage
);
309 stage
->point
= validate_point
;
310 stage
->line
= validate_line
;
311 stage
->tri
= validate_tri
;
312 stage
->flush
= validate_flush
;
313 stage
->reset_stipple_counter
= validate_reset_stipple_counter
;
314 stage
->destroy
= validate_destroy
;