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"
34 #include "draw_pipe.h"
36 static boolean
points( unsigned prim
)
38 return (prim
== PIPE_PRIM_POINTS
);
41 static boolean
lines( unsigned prim
)
43 return (prim
== PIPE_PRIM_LINES
||
44 prim
== PIPE_PRIM_LINE_STRIP
||
45 prim
== PIPE_PRIM_LINE_LOOP
);
48 static boolean
triangles( unsigned prim
)
50 return prim
>= PIPE_PRIM_TRIANGLES
;
54 * Check if we need any special pipeline stages, or whether
55 * prims/verts can go through untouched. Don't test for bypass
56 * clipping or vs modes, this function is just about the primitive
60 draw_need_pipeline(const struct draw_context
*draw
,
63 /* Don't have to worry about triangles turning into lines/points
64 * and triggering the pipeline, because we have to trigger the
65 * pipeline *anyway* if unfilled mode is active.
70 if (draw
->rasterizer
->line_stipple_enable
&& draw
->pipeline
.line_stipple
)
74 if (draw
->rasterizer
->line_width
> draw
->pipeline
.wide_line_threshold
)
78 if (draw
->rasterizer
->line_smooth
&& draw
->pipeline
.aaline
)
85 if (draw
->rasterizer
->point_size
> draw
->pipeline
.wide_point_threshold
)
89 if (draw
->rasterizer
->point_smooth
&& draw
->pipeline
.aapoint
)
93 if (draw
->rasterizer
->point_sprite
&& draw
->pipeline
.point_sprite
)
100 /* polygon stipple */
101 if (draw
->rasterizer
->poly_stipple_enable
&& draw
->pipeline
.pstipple
)
104 /* unfilled polygons */
105 if (draw
->rasterizer
->fill_cw
!= PIPE_POLYGON_MODE_FILL
||
106 draw
->rasterizer
->fill_ccw
!= PIPE_POLYGON_MODE_FILL
)
110 if (draw
->rasterizer
->offset_cw
|| draw
->rasterizer
->offset_ccw
)
113 /* two-side lighting */
114 if (draw
->rasterizer
->light_twoside
)
118 /* polygon cull - this is difficult - hardware can cull just fine
119 * most of the time (though sometimes CULL_NEITHER is unsupported.
121 * Generally this isn't a reason to require the pipeline, though.
123 if (draw->rasterizer->cull_mode)
133 * Rebuild the rendering pipeline.
135 static struct draw_stage
*validate_pipeline( struct draw_stage
*stage
)
137 struct draw_context
*draw
= stage
->draw
;
138 struct draw_stage
*next
= draw
->pipeline
.rasterize
;
140 int precalc_flat
= 0;
141 boolean wide_lines
, wide_points
;
143 /* Set the validate's next stage to the rasterize stage, so that it
144 * can be found later if needed for flushing.
148 /* drawing wide lines? */
149 wide_lines
= (draw
->rasterizer
->line_width
> draw
->pipeline
.wide_line_threshold
150 && !draw
->rasterizer
->line_smooth
);
152 /* drawing large points? */
153 if (draw
->rasterizer
->point_sprite
&& draw
->pipeline
.point_sprite
)
155 else if (draw
->rasterizer
->point_smooth
&& draw
->pipeline
.aapoint
)
157 else if (draw
->rasterizer
->point_size
> draw
->pipeline
.wide_point_threshold
)
163 * NOTE: we build up the pipeline in end-to-start order.
165 * TODO: make the current primitive part of the state and build
166 * shorter pipelines for lines & points.
169 if (draw
->rasterizer
->line_smooth
&& draw
->pipeline
.aaline
) {
170 draw
->pipeline
.aaline
->next
= next
;
171 next
= draw
->pipeline
.aaline
;
174 if (draw
->rasterizer
->point_smooth
&& draw
->pipeline
.aapoint
) {
175 draw
->pipeline
.aapoint
->next
= next
;
176 next
= draw
->pipeline
.aapoint
;
180 draw
->pipeline
.wide_line
->next
= next
;
181 next
= draw
->pipeline
.wide_line
;
185 if (wide_points
|| draw
->rasterizer
->point_sprite
) {
186 draw
->pipeline
.wide_point
->next
= next
;
187 next
= draw
->pipeline
.wide_point
;
190 if (draw
->rasterizer
->line_stipple_enable
&& draw
->pipeline
.line_stipple
) {
191 draw
->pipeline
.stipple
->next
= next
;
192 next
= draw
->pipeline
.stipple
;
193 precalc_flat
= 1; /* only needed for lines really */
196 if (draw
->rasterizer
->poly_stipple_enable
197 && draw
->pipeline
.pstipple
) {
198 draw
->pipeline
.pstipple
->next
= next
;
199 next
= draw
->pipeline
.pstipple
;
202 if (draw
->rasterizer
->fill_cw
!= PIPE_POLYGON_MODE_FILL
||
203 draw
->rasterizer
->fill_ccw
!= PIPE_POLYGON_MODE_FILL
) {
204 draw
->pipeline
.unfilled
->next
= next
;
205 next
= draw
->pipeline
.unfilled
;
206 precalc_flat
= 1; /* only needed for triangles really */
210 if (draw
->rasterizer
->flatshade
&& precalc_flat
) {
211 draw
->pipeline
.flatshade
->next
= next
;
212 next
= draw
->pipeline
.flatshade
;
215 if (draw
->rasterizer
->offset_cw
||
216 draw
->rasterizer
->offset_ccw
) {
217 draw
->pipeline
.offset
->next
= next
;
218 next
= draw
->pipeline
.offset
;
222 if (draw
->rasterizer
->light_twoside
) {
223 draw
->pipeline
.twoside
->next
= next
;
224 next
= draw
->pipeline
.twoside
;
228 /* Always run the cull stage as we calculate determinant there
231 * This can actually be a win as culling out the triangles can lead
232 * to less work emitting vertices, smaller vertex buffers, etc.
233 * It's difficult to say whether this will be true in general.
235 if (need_det
|| draw
->rasterizer
->cull_mode
) {
236 draw
->pipeline
.cull
->next
= next
;
237 next
= draw
->pipeline
.cull
;
242 if (!draw
->rasterizer
->bypass_clipping
)
244 draw
->pipeline
.clip
->next
= next
;
245 next
= draw
->pipeline
.clip
;
249 draw
->pipeline
.first
= next
;
253 static void validate_tri( struct draw_stage
*stage
,
254 struct prim_header
*header
)
256 struct draw_stage
*pipeline
= validate_pipeline( stage
);
257 pipeline
->tri( pipeline
, header
);
260 static void validate_line( struct draw_stage
*stage
,
261 struct prim_header
*header
)
263 struct draw_stage
*pipeline
= validate_pipeline( stage
);
264 pipeline
->line( pipeline
, header
);
267 static void validate_point( struct draw_stage
*stage
,
268 struct prim_header
*header
)
270 struct draw_stage
*pipeline
= validate_pipeline( stage
);
271 pipeline
->point( pipeline
, header
);
274 static void validate_reset_stipple_counter( struct draw_stage
*stage
)
276 struct draw_stage
*pipeline
= validate_pipeline( stage
);
277 pipeline
->reset_stipple_counter( pipeline
);
280 static void validate_flush( struct draw_stage
*stage
,
283 /* May need to pass a backend flush on to the rasterize stage.
286 stage
->next
->flush( stage
->next
, flags
);
290 static void validate_destroy( struct draw_stage
*stage
)
297 * Create validate pipeline stage.
299 struct draw_stage
*draw_validate_stage( struct draw_context
*draw
)
301 struct draw_stage
*stage
= CALLOC_STRUCT(draw_stage
);
305 stage
->point
= validate_point
;
306 stage
->line
= validate_line
;
307 stage
->tri
= validate_tri
;
308 stage
->flush
= validate_flush
;
309 stage
->reset_stipple_counter
= validate_reset_stipple_counter
;
310 stage
->destroy
= validate_destroy
;