2 * Copyright 2012 Advanced Micro Devices, Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * on the rights to use, copy, modify, merge, publish, distribute, sub
8 * license, and/or sell copies of the Software, and to permit persons to whom
9 * the Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
21 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 #include "tgsi/tgsi_scan.h"
27 #define GET_MAX_SCISSOR(rctx) (rctx->chip_class >= EVERGREEN ? 16384 : 8192)
29 static void r600_set_scissor_states(struct pipe_context
*ctx
,
31 unsigned num_scissors
,
32 const struct pipe_scissor_state
*state
)
34 struct r600_common_context
*rctx
= (struct r600_common_context
*)ctx
;
37 for (i
= 0; i
< num_scissors
; i
++)
38 rctx
->scissors
.states
[start_slot
+ i
] = state
[i
];
40 if (!rctx
->scissor_enabled
)
43 rctx
->scissors
.dirty_mask
|= ((1 << num_scissors
) - 1) << start_slot
;
44 rctx
->set_atom_dirty(rctx
, &rctx
->scissors
.atom
, true);
47 /* Since the guard band disables clipping, we have to clip per-pixel
50 static void r600_get_scissor_from_viewport(struct r600_common_context
*rctx
,
51 const struct pipe_viewport_state
*vp
,
52 struct r600_signed_scissor
*scissor
)
54 float tmp
, minx
, miny
, maxx
, maxy
;
56 /* Convert (-1, -1) and (1, 1) from clip space into window space. */
57 minx
= -vp
->scale
[0] + vp
->translate
[0];
58 miny
= -vp
->scale
[1] + vp
->translate
[1];
59 maxx
= vp
->scale
[0] + vp
->translate
[0];
60 maxy
= vp
->scale
[1] + vp
->translate
[1];
62 /* r600_draw_rectangle sets this. Disable the scissor. */
63 if (minx
== -1 && miny
== -1 && maxx
== 1 && maxy
== 1) {
64 scissor
->minx
= scissor
->miny
= 0;
65 scissor
->maxx
= scissor
->maxy
= GET_MAX_SCISSOR(rctx
);
69 /* Handle inverted viewports. */
81 /* Convert to integer and round up the max bounds. */
84 scissor
->maxx
= ceilf(maxx
);
85 scissor
->maxy
= ceilf(maxy
);
88 static void r600_clamp_scissor(struct r600_common_context
*rctx
,
89 struct pipe_scissor_state
*out
,
90 struct r600_signed_scissor
*scissor
)
92 unsigned max_scissor
= GET_MAX_SCISSOR(rctx
);
93 out
->minx
= CLAMP(scissor
->minx
, 0, max_scissor
);
94 out
->miny
= CLAMP(scissor
->miny
, 0, max_scissor
);
95 out
->maxx
= CLAMP(scissor
->maxx
, 0, max_scissor
);
96 out
->maxy
= CLAMP(scissor
->maxy
, 0, max_scissor
);
99 static void r600_clip_scissor(struct pipe_scissor_state
*out
,
100 struct pipe_scissor_state
*clip
)
102 out
->minx
= MAX2(out
->minx
, clip
->minx
);
103 out
->miny
= MAX2(out
->miny
, clip
->miny
);
104 out
->maxx
= MIN2(out
->maxx
, clip
->maxx
);
105 out
->maxy
= MIN2(out
->maxy
, clip
->maxy
);
108 static void r600_scissor_make_union(struct r600_signed_scissor
*out
,
109 struct r600_signed_scissor
*in
)
111 out
->minx
= MIN2(out
->minx
, in
->minx
);
112 out
->miny
= MIN2(out
->miny
, in
->miny
);
113 out
->maxx
= MAX2(out
->maxx
, in
->maxx
);
114 out
->maxy
= MAX2(out
->maxy
, in
->maxy
);
117 void evergreen_apply_scissor_bug_workaround(struct r600_common_context
*rctx
,
118 struct pipe_scissor_state
*scissor
)
120 if (rctx
->chip_class
== EVERGREEN
|| rctx
->chip_class
== CAYMAN
) {
121 if (scissor
->maxx
== 0)
123 if (scissor
->maxy
== 0)
126 if (rctx
->chip_class
== CAYMAN
&&
127 scissor
->maxx
== 1 && scissor
->maxy
== 1)
132 static void r600_emit_one_scissor(struct r600_common_context
*rctx
,
133 struct radeon_winsys_cs
*cs
,
134 struct r600_signed_scissor
*vp_scissor
,
135 struct pipe_scissor_state
*scissor
)
137 struct pipe_scissor_state final
;
139 if (rctx
->vs_disables_clipping_viewport
) {
140 final
.minx
= final
.miny
= 0;
141 final
.maxx
= final
.maxy
= GET_MAX_SCISSOR(rctx
);
143 r600_clamp_scissor(rctx
, &final
, vp_scissor
);
147 r600_clip_scissor(&final
, scissor
);
149 evergreen_apply_scissor_bug_workaround(rctx
, &final
);
151 radeon_emit(cs
, S_028250_TL_X(final
.minx
) |
152 S_028250_TL_Y(final
.miny
) |
153 S_028250_WINDOW_OFFSET_DISABLE(1));
154 radeon_emit(cs
, S_028254_BR_X(final
.maxx
) |
155 S_028254_BR_Y(final
.maxy
));
158 /* the range is [-MAX, MAX] */
159 #define GET_MAX_VIEWPORT_RANGE(rctx) (rctx->chip_class >= EVERGREEN ? 32768 : 16384)
161 static void r600_emit_guardband(struct r600_common_context
*rctx
,
162 struct r600_signed_scissor
*vp_as_scissor
)
164 struct radeon_winsys_cs
*cs
= rctx
->gfx
.cs
;
165 struct pipe_viewport_state vp
;
166 float left
, top
, right
, bottom
, max_range
, guardband_x
, guardband_y
;
168 /* Reconstruct the viewport transformation from the scissor. */
169 vp
.translate
[0] = (vp_as_scissor
->minx
+ vp_as_scissor
->maxx
) / 2.0;
170 vp
.translate
[1] = (vp_as_scissor
->miny
+ vp_as_scissor
->maxy
) / 2.0;
171 vp
.scale
[0] = vp_as_scissor
->maxx
- vp
.translate
[0];
172 vp
.scale
[1] = vp_as_scissor
->maxy
- vp
.translate
[1];
174 /* Treat a 0x0 viewport as 1x1 to prevent division by zero. */
175 if (vp_as_scissor
->minx
== vp_as_scissor
->maxx
)
177 if (vp_as_scissor
->miny
== vp_as_scissor
->maxy
)
180 /* Find the biggest guard band that is inside the supported viewport
181 * range. The guard band is specified as a horizontal and vertical
182 * distance from (0,0) in clip space.
184 * This is done by applying the inverse viewport transformation
185 * on the viewport limits to get those limits in clip space.
187 * Use a limit one pixel smaller to allow for some precision error.
189 max_range
= GET_MAX_VIEWPORT_RANGE(rctx
) - 1;
190 left
= (-max_range
- vp
.translate
[0]) / vp
.scale
[0];
191 right
= ( max_range
- vp
.translate
[0]) / vp
.scale
[0];
192 top
= (-max_range
- vp
.translate
[1]) / vp
.scale
[1];
193 bottom
= ( max_range
- vp
.translate
[1]) / vp
.scale
[1];
195 assert(left
<= -1 && top
<= -1 && right
>= 1 && bottom
>= 1);
197 guardband_x
= MIN2(-left
, right
);
198 guardband_y
= MIN2(-top
, bottom
);
200 /* If any of the GB registers is updated, all of them must be updated. */
201 if (rctx
->chip_class
>= CAYMAN
)
202 radeon_set_context_reg_seq(cs
, CM_R_028BE8_PA_CL_GB_VERT_CLIP_ADJ
, 4);
204 radeon_set_context_reg_seq(cs
, R600_R_028C0C_PA_CL_GB_VERT_CLIP_ADJ
, 4);
206 radeon_emit(cs
, fui(guardband_y
)); /* R_028BE8_PA_CL_GB_VERT_CLIP_ADJ */
207 radeon_emit(cs
, fui(1.0)); /* R_028BEC_PA_CL_GB_VERT_DISC_ADJ */
208 radeon_emit(cs
, fui(guardband_x
)); /* R_028BF0_PA_CL_GB_HORZ_CLIP_ADJ */
209 radeon_emit(cs
, fui(1.0)); /* R_028BF4_PA_CL_GB_HORZ_DISC_ADJ */
212 static void r600_emit_scissors(struct r600_common_context
*rctx
, struct r600_atom
*atom
)
214 struct radeon_winsys_cs
*cs
= rctx
->gfx
.cs
;
215 struct pipe_scissor_state
*states
= rctx
->scissors
.states
;
216 unsigned mask
= rctx
->scissors
.dirty_mask
;
217 bool scissor_enabled
= rctx
->scissor_enabled
;
218 struct r600_signed_scissor max_vp_scissor
;
221 /* The simple case: Only 1 viewport is active. */
222 if (!rctx
->vs_writes_viewport_index
) {
223 struct r600_signed_scissor
*vp
= &rctx
->viewports
.as_scissor
[0];
228 radeon_set_context_reg_seq(cs
, R_028250_PA_SC_VPORT_SCISSOR_0_TL
, 2);
229 r600_emit_one_scissor(rctx
, cs
, vp
, scissor_enabled
? &states
[0] : NULL
);
230 r600_emit_guardband(rctx
, vp
);
231 rctx
->scissors
.dirty_mask
&= ~1; /* clear one bit */
235 /* Shaders can draw to any viewport. Make a union of all viewports. */
236 max_vp_scissor
= rctx
->viewports
.as_scissor
[0];
237 for (i
= 1; i
< R600_MAX_VIEWPORTS
; i
++)
238 r600_scissor_make_union(&max_vp_scissor
,
239 &rctx
->viewports
.as_scissor
[i
]);
244 u_bit_scan_consecutive_range(&mask
, &start
, &count
);
246 radeon_set_context_reg_seq(cs
, R_028250_PA_SC_VPORT_SCISSOR_0_TL
+
247 start
* 4 * 2, count
* 2);
248 for (i
= start
; i
< start
+count
; i
++) {
249 r600_emit_one_scissor(rctx
, cs
, &rctx
->viewports
.as_scissor
[i
],
250 scissor_enabled
? &states
[i
] : NULL
);
253 r600_emit_guardband(rctx
, &max_vp_scissor
);
254 rctx
->scissors
.dirty_mask
= 0;
257 static void r600_set_viewport_states(struct pipe_context
*ctx
,
259 unsigned num_viewports
,
260 const struct pipe_viewport_state
*state
)
262 struct r600_common_context
*rctx
= (struct r600_common_context
*)ctx
;
265 for (i
= 0; i
< num_viewports
; i
++) {
266 unsigned index
= start_slot
+ i
;
268 rctx
->viewports
.states
[index
] = state
[i
];
269 r600_get_scissor_from_viewport(rctx
, &state
[i
],
270 &rctx
->viewports
.as_scissor
[index
]);
273 rctx
->viewports
.dirty_mask
|= ((1 << num_viewports
) - 1) << start_slot
;
274 rctx
->scissors
.dirty_mask
|= ((1 << num_viewports
) - 1) << start_slot
;
275 rctx
->set_atom_dirty(rctx
, &rctx
->viewports
.atom
, true);
276 rctx
->set_atom_dirty(rctx
, &rctx
->scissors
.atom
, true);
279 static void r600_emit_viewports(struct r600_common_context
*rctx
, struct r600_atom
*atom
)
281 struct radeon_winsys_cs
*cs
= rctx
->gfx
.cs
;
282 struct pipe_viewport_state
*states
= rctx
->viewports
.states
;
283 unsigned mask
= rctx
->viewports
.dirty_mask
;
285 /* The simple case: Only 1 viewport is active. */
286 if (!rctx
->vs_writes_viewport_index
) {
290 radeon_set_context_reg_seq(cs
, R_02843C_PA_CL_VPORT_XSCALE
, 6);
291 radeon_emit(cs
, fui(states
[0].scale
[0]));
292 radeon_emit(cs
, fui(states
[0].translate
[0]));
293 radeon_emit(cs
, fui(states
[0].scale
[1]));
294 radeon_emit(cs
, fui(states
[0].translate
[1]));
295 radeon_emit(cs
, fui(states
[0].scale
[2]));
296 radeon_emit(cs
, fui(states
[0].translate
[2]));
297 rctx
->viewports
.dirty_mask
&= ~1; /* clear one bit */
304 u_bit_scan_consecutive_range(&mask
, &start
, &count
);
306 radeon_set_context_reg_seq(cs
, R_02843C_PA_CL_VPORT_XSCALE
+
307 start
* 4 * 6, count
* 6);
308 for (i
= start
; i
< start
+count
; i
++) {
309 radeon_emit(cs
, fui(states
[i
].scale
[0]));
310 radeon_emit(cs
, fui(states
[i
].translate
[0]));
311 radeon_emit(cs
, fui(states
[i
].scale
[1]));
312 radeon_emit(cs
, fui(states
[i
].translate
[1]));
313 radeon_emit(cs
, fui(states
[i
].scale
[2]));
314 radeon_emit(cs
, fui(states
[i
].translate
[2]));
317 rctx
->viewports
.dirty_mask
= 0;
320 void r600_set_scissor_enable(struct r600_common_context
*rctx
, bool enable
)
322 if (rctx
->scissor_enabled
!= enable
) {
323 rctx
->scissor_enabled
= enable
;
324 rctx
->scissors
.dirty_mask
= (1 << R600_MAX_VIEWPORTS
) - 1;
325 rctx
->set_atom_dirty(rctx
, &rctx
->scissors
.atom
, true);
330 * Normally, we only emit 1 viewport and 1 scissor if no shader is using
331 * the VIEWPORT_INDEX output, and emitting the other viewports and scissors
332 * is delayed. When a shader with VIEWPORT_INDEX appears, this should be
333 * called to emit the rest.
335 void r600_update_vs_writes_viewport_index(struct r600_common_context
*rctx
,
336 struct tgsi_shader_info
*info
)
338 bool vs_window_space
;
343 /* When the VS disables clipping and viewport transformation. */
345 info
->properties
[TGSI_PROPERTY_VS_WINDOW_SPACE_POSITION
];
347 if (rctx
->vs_disables_clipping_viewport
!= vs_window_space
) {
348 rctx
->vs_disables_clipping_viewport
= vs_window_space
;
349 rctx
->scissors
.dirty_mask
= (1 << R600_MAX_VIEWPORTS
) - 1;
350 rctx
->set_atom_dirty(rctx
, &rctx
->scissors
.atom
, true);
353 /* Viewport index handling. */
354 rctx
->vs_writes_viewport_index
= info
->writes_viewport_index
;
355 if (!rctx
->vs_writes_viewport_index
)
358 if (rctx
->scissors
.dirty_mask
)
359 rctx
->set_atom_dirty(rctx
, &rctx
->scissors
.atom
, true);
360 if (rctx
->viewports
.dirty_mask
)
361 rctx
->set_atom_dirty(rctx
, &rctx
->viewports
.atom
, true);
364 void r600_init_viewport_functions(struct r600_common_context
*rctx
)
366 rctx
->scissors
.atom
.emit
= r600_emit_scissors
;
367 rctx
->viewports
.atom
.emit
= r600_emit_viewports
;
369 rctx
->scissors
.atom
.num_dw
= (2 + 16 * 2) + 6;
370 rctx
->viewports
.atom
.num_dw
= 2 + 16 * 6;
372 rctx
->b
.set_scissor_states
= r600_set_scissor_states
;
373 rctx
->b
.set_viewport_states
= r600_set_viewport_states
;