afbc816fb915a4600db945ffd7084594cc2622a9
1 /**************************************************************************
3 * Copyright 2010, 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 * Binning code for points
32 #include "lp_setup_context.h"
33 #include "util/u_math.h"
34 #include "util/u_memory.h"
36 #include "lp_setup_context.h"
38 #include "lp_state_fs.h"
40 #define NUM_CHANNELS 4
52 * Compute a0 for a constant-valued coefficient (GL_FLAT shading).
54 static void constant_coef( struct lp_setup_context
*setup
,
55 struct lp_rast_triangle
*point
,
60 point
->inputs
.a0
[slot
][i
] = value
;
61 point
->inputs
.dadx
[slot
][i
] = 0.0f
;
62 point
->inputs
.dady
[slot
][i
] = 0.0f
;
66 * Special coefficient setup for gl_FragCoord.
68 * Z and W are copied from position_coef which should have already been computed.
69 * We could do a bit less work if we'd examine gl_FragCoord's swizzle mask.
72 setup_point_fragcoord_coef(struct lp_setup_context
*setup
,
73 struct lp_rast_triangle
*point
,
74 const struct point_info
*info
,
79 if (usage_mask
& TGSI_WRITEMASK_X
) {
80 point
->inputs
.a0
[slot
][0] = 0.0;
81 point
->inputs
.dadx
[slot
][0] = 1.0;
82 point
->inputs
.dady
[slot
][0] = 0.0;
86 if (usage_mask
& TGSI_WRITEMASK_Y
) {
87 point
->inputs
.a0
[slot
][1] = 0.0;
88 point
->inputs
.dadx
[slot
][1] = 0.0;
89 point
->inputs
.dady
[slot
][1] = 1.0;
93 if (usage_mask
& TGSI_WRITEMASK_Z
) {
94 constant_coef(setup
, point
, slot
, info
->v0
[0][2], 2);
98 if (usage_mask
& TGSI_WRITEMASK_W
) {
99 constant_coef(setup
, point
, slot
, info
->v0
[0][3], 3);
104 * Compute the point->coef[] array dadx, dady, a0 values.
107 setup_point_coefficients( struct lp_setup_context
*setup
,
108 struct lp_rast_triangle
*point
,
109 const struct point_info
*info
)
111 unsigned fragcoord_usage_mask
= TGSI_WRITEMASK_XYZ
;
114 /* setup interpolation for all the remaining attributes:
116 for (slot
= 0; slot
< setup
->fs
.nr_inputs
; slot
++) {
117 unsigned vert_attr
= setup
->fs
.input
[slot
].src_index
;
118 unsigned usage_mask
= setup
->fs
.input
[slot
].usage_mask
;
121 switch (setup
->fs
.input
[slot
].interp
) {
122 case LP_INTERP_POSITION
:
124 * The generated pixel interpolators will pick up the coeffs from
125 * slot 0, so all need to ensure that the usage mask is covers all
128 fragcoord_usage_mask
|= usage_mask
;
132 for (i
= 0; i
< NUM_CHANNELS
; i
++) {
133 if (usage_mask
& (1 << i
))
134 constant_coef(setup
, point
, slot
+1, info
->v0
[vert_attr
][i
], i
);
139 /* The internal position input is in slot zero:
141 setup_point_fragcoord_coef(setup
, point
, info
, 0,
142 fragcoord_usage_mask
);
146 subpixel_snap(float a
)
148 return util_iround(FIXED_ONE
* a
);
152 static void lp_setup_point( struct lp_setup_context
*setup
,
153 const float (*v0
)[4] )
155 /* x/y positions in fixed point */
156 const int sizeAttr
= setup
->psize
;
158 = sizeAttr
> 0 ? v0
[sizeAttr
][0]
161 /* Point size as fixed point integer, remove rounding errors
162 * and gives minimum width for very small points
164 int fixed_width
= MAX2(FIXED_ONE
,
165 (subpixel_snap(size
) + FIXED_ONE
/2 - 1) & ~(FIXED_ONE
-1));
167 const int x0
= subpixel_snap(v0
[0][0] - setup
->pixel_offset
) - fixed_width
/2;
168 const int y0
= subpixel_snap(v0
[0][1] - setup
->pixel_offset
) - fixed_width
/2;
170 struct lp_scene
*scene
= lp_setup_get_current_scene(setup
);
171 struct lp_rast_triangle
*point
;
174 unsigned nr_planes
= 4;
175 struct point_info info
;
178 /* Bounding rectangle (in pixels) */
180 /* Yes this is necessary to accurately calculate bounding boxes
181 * with the two fill-conventions we support. GL (normally) ends
182 * up needing a bottom-left fill convention, which requires
183 * slightly different rounding.
185 int adj
= (setup
->pixel_offset
!= 0) ? 1 : 0;
187 bbox
.x0
= (x0
+ (FIXED_ONE
-1) + adj
) >> FIXED_ORDER
;
188 bbox
.x1
= (x0
+ fixed_width
+ (FIXED_ONE
-1) + adj
) >> FIXED_ORDER
;
189 bbox
.y0
= (y0
+ (FIXED_ONE
-1)) >> FIXED_ORDER
;
190 bbox
.y1
= (y0
+ fixed_width
+ (FIXED_ONE
-1)) >> FIXED_ORDER
;
192 /* Inclusive coordinates:
198 if (!u_rect_test_intersection(&setup
->draw_region
, &bbox
)) {
199 if (0) debug_printf("offscreen\n");
200 LP_COUNT(nr_culled_tris
);
204 u_rect_find_intersection(&setup
->draw_region
, &bbox
);
206 point
= lp_setup_alloc_triangle(scene
,
214 point
->v
[0][0] = v0
[0][0];
215 point
->v
[0][1] = v0
[0][1];
220 info
.dx12
= fixed_width
;
221 info
.dy01
= fixed_width
;
224 /* Setup parameter interpolants:
226 setup_point_coefficients(setup
, point
, &info
);
228 point
->inputs
.facing
= 1.0F
;
229 point
->inputs
.state
= setup
->fs
.stored
;
232 point
->plane
[0].dcdx
= -1;
233 point
->plane
[0].dcdy
= 0;
234 point
->plane
[0].c
= 1-bbox
.x0
;
235 point
->plane
[0].ei
= 0;
236 point
->plane
[0].eo
= 1;
238 point
->plane
[1].dcdx
= 1;
239 point
->plane
[1].dcdy
= 0;
240 point
->plane
[1].c
= bbox
.x1
+1;
241 point
->plane
[1].ei
= -1;
242 point
->plane
[1].eo
= 0;
244 point
->plane
[2].dcdx
= 0;
245 point
->plane
[2].dcdy
= 1;
246 point
->plane
[2].c
= 1-bbox
.y0
;
247 point
->plane
[2].ei
= 0;
248 point
->plane
[2].eo
= 1;
250 point
->plane
[3].dcdx
= 0;
251 point
->plane
[3].dcdy
= -1;
252 point
->plane
[3].c
= bbox
.y1
+1;
253 point
->plane
[3].ei
= -1;
254 point
->plane
[3].eo
= 0;
257 lp_setup_bin_triangle(setup
, point
, &bbox
, nr_planes
);
262 lp_setup_choose_point( struct lp_setup_context
*setup
)
264 setup
->point
= lp_setup_point
;