1 /*
2 * Copyright (c) 2018-2024 Broadcom. All Rights Reserved.
3 * The term “Broadcom” refers to Broadcom Inc.
4 * and/or its subsidiaries.
5 * SPDX-License-Identifier: MIT
6 */
7
8 #include "util/u_inlines.h"
9 #include "util/u_memory.h"
10 #include "util/u_simple_shaders.h"
11
12 #include "svga_context.h"
13 #include "svga_cmd.h"
14 #include "svga_tgsi.h"
15 #include "svga_shader.h"
16
17
18 static void
make_tcs_key(struct svga_context * svga,struct svga_compile_key * key)19 make_tcs_key(struct svga_context *svga, struct svga_compile_key *key)
20 {
21 struct svga_tcs_shader *tcs = svga->curr.tcs;
22
23 memset(key, 0, sizeof *key);
24
25 /*
26 * SVGA_NEW_TEXTURE_BINDING | SVGA_NEW_SAMPLER
27 */
28 svga_init_shader_key_common(svga, PIPE_SHADER_TESS_CTRL, &tcs->base, key);
29
30 /* SVGA_NEW_TCS_PARAM */
31 key->tcs.vertices_per_patch = svga->curr.vertices_per_patch;
32
33 /* The tessellator parameters come from the layout section in the
34 * tessellation evaluation shader. Get these parameters from the
35 * current tessellation evaluation shader variant.
36 * Note: this requires the tessellation evaluation shader to be
37 * compiled first.
38 */
39 struct svga_tes_variant *tes = svga_tes_variant(svga->state.hw_draw.tes);
40 key->tcs.prim_mode = tes->prim_mode;
41 key->tcs.spacing = tes->spacing;
42 key->tcs.vertices_order_cw = tes->vertices_order_cw;
43 key->tcs.point_mode = tes->point_mode;
44
45 /* The number of control point output from tcs is determined by the
46 * number of control point input expected in tes. If tes does not expect
47 * any control point input, then vertices_per_patch in the tes key will
48 * be 0, otherwise it will contain the number of vertices out as specified
49 * in the tcs property.
50 */
51 key->tcs.vertices_out = tes->base.key.tes.vertices_per_patch;
52
53 if (svga->tcs.passthrough)
54 key->tcs.passthrough = 1;
55
56 key->clip_plane_enable = svga->curr.rast->templ.clip_plane_enable;
57
58 /* tcs is always followed by tes */
59 key->last_vertex_stage = 0;
60 }
61
62
63 static enum pipe_error
emit_hw_tcs(struct svga_context * svga,uint64_t dirty)64 emit_hw_tcs(struct svga_context *svga, uint64_t dirty)
65 {
66 struct svga_shader_variant *variant;
67 struct svga_tcs_shader *tcs = svga->curr.tcs;
68 enum pipe_error ret = PIPE_OK;
69 struct svga_compile_key key;
70
71 assert(svga_have_sm5(svga));
72
73 SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_EMITTCS);
74
75 if (!tcs) {
76 /* If there is no active tcs, then there should not be
77 * active tes either
78 */
79 assert(!svga->curr.tes);
80 if (svga->state.hw_draw.tcs != NULL) {
81
82 /** The previous tessellation control shader is made inactive.
83 * Needs to unbind the tessellation control shader.
84 */
85 ret = svga_set_shader(svga, SVGA3D_SHADERTYPE_HS, NULL);
86 if (ret != PIPE_OK)
87 goto done;
88 svga->state.hw_draw.tcs = NULL;
89 }
90 goto done;
91 }
92
93 make_tcs_key(svga, &key);
94
95 /* See if we already have a TCS variant that matches the key */
96 variant = svga_search_shader_key(&tcs->base, &key);
97
98 if (!variant) {
99 ret = svga_compile_shader(svga, &tcs->base, &key, &variant);
100 if (ret != PIPE_OK)
101 goto done;
102 }
103
104 if (variant != svga->state.hw_draw.tcs) {
105 /* Bind the new variant */
106 ret = svga_set_shader(svga, SVGA3D_SHADERTYPE_HS, variant);
107 if (ret != PIPE_OK)
108 goto done;
109
110 svga->rebind.flags.tcs = false;
111 svga->dirty |= SVGA_NEW_TCS_VARIANT;
112 svga->state.hw_draw.tcs = variant;
113 }
114
115 done:
116 SVGA_STATS_TIME_POP(svga_sws(svga));
117 return ret;
118 }
119
120
121 struct svga_tracked_state svga_hw_tcs =
122 {
123 "tessellation control shader (hwtnl)",
124 (SVGA_NEW_VS |
125 SVGA_NEW_TCS |
126 SVGA_NEW_TES |
127 SVGA_NEW_TEXTURE_BINDING |
128 SVGA_NEW_SAMPLER |
129 SVGA_NEW_RAST |
130 SVGA_NEW_TCS_RAW_BUFFER),
131 emit_hw_tcs
132 };
133
134
135 static void
make_tes_key(struct svga_context * svga,struct svga_compile_key * key)136 make_tes_key(struct svga_context *svga, struct svga_compile_key *key)
137 {
138 struct svga_tes_shader *tes = svga->curr.tes;
139
140 memset(key, 0, sizeof *key);
141
142 /*
143 * SVGA_NEW_TEXTURE_BINDING | SVGA_NEW_SAMPLER
144 */
145 svga_init_shader_key_common(svga, PIPE_SHADER_TESS_EVAL, &tes->base, key);
146
147 assert(svga->curr.tcs);
148
149 key->tes.vertices_per_patch = tes->base.info.tes.reads_control_point ?
150 svga->curr.tcs->base.info.tcs.vertices_out : 0;
151
152 key->tes.need_prescale = svga->state.hw_clear.prescale[0].enabled &&
153 (svga->curr.gs == NULL);
154
155 /* tcs emits tessellation factors as extra outputs.
156 * Since tes depends on them, save the tessFactor output index
157 * from tcs in the tes compile key, so that if a different
158 * tcs is bound and if the tessFactor index is different,
159 * a different tes variant will be generated.
160 */
161 key->tes.tessfactor_index = svga->curr.tcs->base.info.num_outputs;
162
163 key->clip_plane_enable = svga->curr.rast->templ.clip_plane_enable;
164
165 /* This is the last vertex stage if there is no geometry shader. */
166 key->last_vertex_stage = !svga->curr.gs;
167
168 key->tes.need_tessinner = svga->curr.tcs->base.info.tcs.writes_tess_factor;
169 key->tes.need_tessouter = svga->curr.tcs->base.info.tcs.writes_tess_factor;
170 }
171
172
173 static void
get_passthrough_tcs(struct svga_context * svga)174 get_passthrough_tcs(struct svga_context *svga)
175 {
176 if (svga->tcs.passthrough_tcs &&
177 svga->tcs.vs == svga->curr.vs &&
178 svga->tcs.tes == svga->curr.tes &&
179 svga->tcs.vertices_per_patch == svga->curr.vertices_per_patch) {
180 svga->pipe.bind_tcs_state(&svga->pipe,
181 svga->tcs.passthrough_tcs);
182 }
183 else {
184 struct svga_tcs_shader *new_tcs;
185
186 /* delete older passthrough shader*/
187 if (svga->tcs.passthrough_tcs) {
188 svga->pipe.delete_tcs_state(&svga->pipe,
189 svga->tcs.passthrough_tcs);
190 }
191
192 new_tcs = (struct svga_tcs_shader *)
193 util_make_tess_ctrl_passthrough_shader(&svga->pipe,
194 svga->curr.vs->base.tgsi_info.num_outputs,
195 svga->curr.tes->base.tgsi_info.num_inputs,
196 svga->curr.vs->base.tgsi_info.output_semantic_name,
197 svga->curr.vs->base.tgsi_info.output_semantic_index,
198 svga->curr.tes->base.tgsi_info.input_semantic_name,
199 svga->curr.tes->base.tgsi_info.input_semantic_index,
200 svga->curr.vertices_per_patch);
201 svga->pipe.bind_tcs_state(&svga->pipe, new_tcs);
202 svga->tcs.passthrough_tcs = new_tcs;
203 svga->tcs.vs = svga->curr.vs;
204 svga->tcs.tes = svga->curr.tes;
205 svga->tcs.vertices_per_patch = svga->curr.vertices_per_patch;
206 }
207
208 struct pipe_constant_buffer cb;
209
210 cb.buffer = NULL;
211 cb.user_buffer = (void *) svga->curr.default_tesslevels;
212 cb.buffer_offset = 0;
213 cb.buffer_size = 2 * 4 * sizeof(float);
214 svga->pipe.set_constant_buffer(&svga->pipe, PIPE_SHADER_TESS_CTRL, 0, false, &cb);
215 }
216
217
218 static enum pipe_error
emit_hw_tes(struct svga_context * svga,uint64_t dirty)219 emit_hw_tes(struct svga_context *svga, uint64_t dirty)
220 {
221 struct svga_shader_variant *variant;
222 struct svga_tes_shader *tes = svga->curr.tes;
223 enum pipe_error ret = PIPE_OK;
224 struct svga_compile_key key;
225
226 assert(svga_have_sm5(svga));
227
228 SVGA_STATS_TIME_PUSH(svga_sws(svga), SVGA_STATS_TIME_EMITTES);
229
230 if (!tes) {
231 /* The GL spec implies that TES is optional when there's a TCS,
232 * but that's apparently a spec error. Assert if we have a TCS
233 * but no TES.
234 */
235 assert(!svga->curr.tcs);
236 if (svga->state.hw_draw.tes != NULL) {
237
238 /** The previous tessellation evaluation shader is made inactive.
239 * Needs to unbind the tessellation evaluation shader.
240 */
241 ret = svga_set_shader(svga, SVGA3D_SHADERTYPE_DS, NULL);
242 if (ret != PIPE_OK)
243 goto done;
244 svga->state.hw_draw.tes = NULL;
245 }
246 goto done;
247 }
248
249 if (!svga->curr.tcs) {
250 /* TES state is processed before the TCS
251 * shader and that's why we're checking for and creating the
252 * passthough TCS in the emit_hw_tes() function.
253 */
254 get_passthrough_tcs(svga);
255 svga->tcs.passthrough = true;
256 }
257 else {
258 svga->tcs.passthrough = false;
259 }
260
261 make_tes_key(svga, &key);
262
263 /* See if we already have a TES variant that matches the key */
264 variant = svga_search_shader_key(&tes->base, &key);
265
266 if (!variant) {
267 ret = svga_compile_shader(svga, &tes->base, &key, &variant);
268 if (ret != PIPE_OK)
269 goto done;
270 }
271
272 if (variant != svga->state.hw_draw.tes) {
273 /* Bind the new variant */
274 ret = svga_set_shader(svga, SVGA3D_SHADERTYPE_DS, variant);
275 if (ret != PIPE_OK)
276 goto done;
277
278 svga->rebind.flags.tes = false;
279 svga->dirty |= SVGA_NEW_TES_VARIANT;
280 svga->state.hw_draw.tes = variant;
281 }
282
283 done:
284 SVGA_STATS_TIME_POP(svga_sws(svga));
285 return ret;
286 }
287
288
289 struct svga_tracked_state svga_hw_tes =
290 {
291 "tessellation evaluation shader (hwtnl)",
292 /* TBD SVGA_NEW_VS/SVGA_NEW_FS/SVGA_NEW_GS are required or not*/
293 (SVGA_NEW_VS |
294 SVGA_NEW_FS |
295 SVGA_NEW_GS |
296 SVGA_NEW_TCS |
297 SVGA_NEW_TES |
298 SVGA_NEW_TEXTURE_BINDING |
299 SVGA_NEW_SAMPLER |
300 SVGA_NEW_RAST |
301 SVGA_NEW_TES_RAW_BUFFER),
302 emit_hw_tes
303 };
304