1 /**************************************************************************
2 *
3 * Copyright 2019 Red Hat.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22 * SOFTWARE.
23 *
24 **************************************************************************/
25
26 /*
27 * NIR lowering passes to handle the draw stages for
28 * - pstipple
29 * - aaline
30 * - aapoint.
31 *
32 * These are all ported from the equivalent TGSI transforms.
33 */
34
35 #include "nir.h"
36 #include "tgsi/tgsi_from_mesa.h"
37 #include "nir_builder.h"
38
39 #include "nir_draw_helpers.h"
40
41 typedef struct {
42 nir_builder b;
43 nir_shader *shader;
44 bool fs_pos_is_sysval;
45 nir_variable *stip_tex;
46 nir_ssa_def *fragcoord;
47 } lower_pstipple;
48
49 static nir_ssa_def *
load_frag_coord(nir_builder * b)50 load_frag_coord(nir_builder *b)
51 {
52 nir_foreach_shader_in_variable(var, b->shader) {
53 if (var->data.location == VARYING_SLOT_POS)
54 return nir_load_var(b, var);
55 }
56
57 nir_variable *pos = nir_variable_create(b->shader, nir_var_shader_in,
58 glsl_vec4_type(), NULL);
59 pos->data.location = VARYING_SLOT_POS;
60 pos->data.interpolation = INTERP_MODE_NOPERSPECTIVE;
61 pos->data.driver_location = b->shader->num_inputs++;
62 return nir_load_var(b, pos);
63 }
64
65 static void
nir_lower_pstipple_block(nir_block * block,lower_pstipple * state)66 nir_lower_pstipple_block(nir_block *block,
67 lower_pstipple *state)
68 {
69 nir_builder *b = &state->b;
70 nir_ssa_def *texcoord;
71
72 b->cursor = nir_before_block(block);
73
74 nir_ssa_def *frag_coord = state->fs_pos_is_sysval ? nir_load_frag_coord(b) : load_frag_coord(b);
75
76 texcoord = nir_fmul(b, nir_channels(b, frag_coord, 0x3),
77 nir_imm_vec2(b, 1.0/32.0, 1.0/32.0));
78
79 nir_tex_instr *tex = nir_tex_instr_create(b->shader, 1);
80 tex->op = nir_texop_tex;
81 tex->sampler_dim = GLSL_SAMPLER_DIM_2D;
82 tex->coord_components = 2;
83 tex->dest_type = nir_type_float32;
84 tex->texture_index = state->stip_tex->data.binding;
85 tex->sampler_index = state->stip_tex->data.binding;
86 tex->src[0].src_type = nir_tex_src_coord;
87 tex->src[0].src = nir_src_for_ssa(texcoord);
88 nir_ssa_dest_init(&tex->instr, &tex->dest, 4, 32, NULL);
89
90 nir_builder_instr_insert(b, &tex->instr);
91
92 nir_ssa_def *condition = nir_f2b32(b, nir_channel(b, &tex->dest.ssa, 3));
93 nir_discard_if(b, condition);
94 b->shader->info.fs.uses_discard = true;
95 }
96
97 static void
nir_lower_pstipple_impl(nir_function_impl * impl,lower_pstipple * state)98 nir_lower_pstipple_impl(nir_function_impl *impl,
99 lower_pstipple *state)
100 {
101 nir_builder *b = &state->b;
102
103 nir_builder_init(b, impl);
104
105 nir_block *start = nir_start_block(impl);
106 nir_lower_pstipple_block(start, state);
107 }
108
109 void
nir_lower_pstipple_fs(struct nir_shader * shader,unsigned * samplerUnitOut,unsigned fixedUnit,bool fs_pos_is_sysval)110 nir_lower_pstipple_fs(struct nir_shader *shader,
111 unsigned *samplerUnitOut,
112 unsigned fixedUnit,
113 bool fs_pos_is_sysval)
114 {
115 lower_pstipple state = {
116 .shader = shader,
117 .fs_pos_is_sysval = fs_pos_is_sysval,
118 };
119 if (shader->info.stage != MESA_SHADER_FRAGMENT)
120 return;
121
122 int binding = 0;
123 nir_foreach_uniform_variable(var, shader) {
124 if (glsl_type_is_sampler(var->type)) {
125 if (var->data.binding >= binding)
126 binding = var->data.binding + 1;
127 }
128 }
129 const struct glsl_type *sampler2D =
130 glsl_sampler_type(GLSL_SAMPLER_DIM_2D, false, false, GLSL_TYPE_FLOAT);
131
132 nir_variable *tex_var = nir_variable_create(shader, nir_var_uniform, sampler2D, "stipple_tex");
133 tex_var->data.binding = binding;
134 tex_var->data.explicit_binding = true;
135 tex_var->data.how_declared = nir_var_hidden;
136
137 BITSET_SET(shader->info.textures_used, binding);
138 state.stip_tex = tex_var;
139
140 nir_foreach_function(function, shader) {
141 if (function->impl) {
142 nir_lower_pstipple_impl(function->impl, &state);
143 }
144 }
145 *samplerUnitOut = binding;
146 }
147
148 typedef struct {
149 nir_builder b;
150 nir_shader *shader;
151 nir_variable *line_width_input;
152 } lower_aaline;
153
154 static void
nir_lower_aaline_block(nir_block * block,lower_aaline * state)155 nir_lower_aaline_block(nir_block *block,
156 lower_aaline *state)
157 {
158 nir_builder *b = &state->b;
159 nir_foreach_instr(instr, block) {
160 if (instr->type != nir_instr_type_intrinsic)
161 continue;
162
163 nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
164 if (intrin->intrinsic != nir_intrinsic_store_deref)
165 continue;
166
167 nir_variable *var = nir_intrinsic_get_var(intrin, 0);
168 if (var->data.mode != nir_var_shader_out)
169 continue;
170 if (var->data.location < FRAG_RESULT_DATA0 && var->data.location != FRAG_RESULT_COLOR)
171 continue;
172
173 nir_ssa_def *out_input = intrin->src[1].ssa;
174 b->cursor = nir_before_instr(instr);
175 nir_ssa_def *lw = nir_load_var(b, state->line_width_input);
176 nir_ssa_def *tmp = nir_fsat(b, nir_fadd(b, nir_channel(b, lw, 1),
177 nir_fneg(b, nir_fabs(b, nir_channel(b, lw, 0)))));
178 nir_ssa_def *tmp1 = nir_fsat(b, nir_fadd(b, nir_channel(b, lw, 3),
179 nir_fneg(b, nir_fabs(b, nir_channel(b, lw, 2)))));
180
181 tmp = nir_fmul(b, tmp, tmp1);
182 tmp = nir_fmul(b, nir_channel(b, out_input, 3), tmp);
183
184 nir_ssa_def *out = nir_vec4(b, nir_channel(b, out_input, 0),
185 nir_channel(b, out_input, 1),
186 nir_channel(b, out_input, 2),
187 tmp);
188 nir_instr_rewrite_src(instr, &intrin->src[1], nir_src_for_ssa(out));
189 }
190
191 }
192
193 static void
nir_lower_aaline_impl(nir_function_impl * impl,lower_aaline * state)194 nir_lower_aaline_impl(nir_function_impl *impl,
195 lower_aaline *state)
196 {
197 nir_builder *b = &state->b;
198
199 nir_builder_init(b, impl);
200
201 nir_foreach_block(block, impl) {
202 nir_lower_aaline_block(block, state);
203 }
204 }
205
206 void
nir_lower_aaline_fs(struct nir_shader * shader,int * varying)207 nir_lower_aaline_fs(struct nir_shader *shader, int *varying)
208 {
209 lower_aaline state = {
210 .shader = shader,
211 };
212 if (shader->info.stage != MESA_SHADER_FRAGMENT)
213 return;
214
215 int highest_location = -1, highest_drv_location = -1;
216 nir_foreach_shader_in_variable(var, shader) {
217 if ((int)var->data.location > highest_location)
218 highest_location = var->data.location;
219 if ((int)var->data.driver_location > highest_drv_location)
220 highest_drv_location = var->data.driver_location;
221 }
222
223 nir_variable *line_width = nir_variable_create(shader, nir_var_shader_in,
224 glsl_vec4_type(), "aaline");
225 if (highest_location == -1 || highest_location < VARYING_SLOT_VAR0) {
226 line_width->data.location = VARYING_SLOT_VAR0;
227 line_width->data.driver_location = highest_drv_location + 1;
228 } else {
229 line_width->data.location = highest_location + 1;
230 line_width->data.driver_location = highest_drv_location + 1;
231 }
232 shader->num_inputs++;
233 *varying = tgsi_get_generic_gl_varying_index(line_width->data.location, true);
234 state.line_width_input = line_width;
235
236 nir_foreach_function(function, shader) {
237 if (function->impl) {
238 nir_lower_aaline_impl(function->impl, &state);
239 }
240 }
241 }
242
243 typedef struct {
244 nir_builder b;
245 nir_shader *shader;
246 nir_variable *input;
247 } lower_aapoint;
248
249 static void
nir_lower_aapoint_block(nir_block * block,lower_aapoint * state,nir_ssa_def * sel)250 nir_lower_aapoint_block(nir_block *block,
251 lower_aapoint *state, nir_ssa_def *sel)
252 {
253 nir_builder *b = &state->b;
254 nir_foreach_instr(instr, block) {
255 if (instr->type != nir_instr_type_intrinsic)
256 continue;
257
258 nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
259 if (intrin->intrinsic != nir_intrinsic_store_deref)
260 continue;
261
262 nir_variable *var = nir_intrinsic_get_var(intrin, 0);
263 if (var->data.mode != nir_var_shader_out)
264 continue;
265 if (var->data.location < FRAG_RESULT_DATA0 && var->data.location != FRAG_RESULT_COLOR)
266 continue;
267
268 nir_ssa_def *out_input = intrin->src[1].ssa;
269 b->cursor = nir_before_instr(instr);
270
271 nir_ssa_def *tmp = nir_fmul(b, nir_channel(b, out_input, 3), sel);
272 nir_ssa_def *out = nir_vec4(b, nir_channel(b, out_input, 0),
273 nir_channel(b, out_input, 1),
274 nir_channel(b, out_input, 2),
275 tmp);
276 nir_instr_rewrite_src(instr, &intrin->src[1], nir_src_for_ssa(out));
277 }
278
279 }
280
281 static void
nir_lower_aapoint_impl(nir_function_impl * impl,lower_aapoint * state)282 nir_lower_aapoint_impl(nir_function_impl *impl,
283 lower_aapoint *state)
284 {
285 nir_builder *b = &state->b;
286
287 nir_builder_init(b, impl);
288
289 nir_block *block = nir_start_block(impl);
290 b->cursor = nir_before_block(block);
291
292 nir_ssa_def *aainput = nir_load_var(b, state->input);
293
294 nir_ssa_def *dist = nir_fadd(b, nir_fmul(b, nir_channel(b, aainput, 0), nir_channel(b, aainput, 0)),
295 nir_fmul(b, nir_channel(b, aainput, 1), nir_channel(b, aainput, 1)));
296
297 nir_ssa_def *k = nir_channel(b, aainput, 2);
298 nir_ssa_def *chan_val_one = nir_channel(b, aainput, 3);
299 nir_ssa_def *comp = nir_flt32(b, chan_val_one, dist);
300
301 nir_discard_if(b, comp);
302 b->shader->info.fs.uses_discard = true;
303
304 /* compute coverage factor = (1-d)/(1-k) */
305 /* 1 - k */
306 nir_ssa_def *tmp = nir_fadd(b, chan_val_one, nir_fneg(b, k));
307 /* 1.0 / (1 - k) */
308 tmp = nir_frcp(b, tmp);
309
310 /* 1 - d */
311 nir_ssa_def *tmp2 = nir_fadd(b, chan_val_one, nir_fneg(b, dist));
312
313 /* (1 - d) / (1 - k) */
314 nir_ssa_def *coverage = nir_fmul(b, tmp, tmp2);
315
316 /* if (k >= distance)
317 * sel = coverage;
318 * else
319 * sel = 1.0;
320 */
321 nir_ssa_def *sel = nir_b32csel(b, nir_fge32(b, k, dist), coverage, chan_val_one);
322
323 nir_foreach_block(block, impl) {
324 nir_lower_aapoint_block(block, state, sel);
325 }
326 }
327
328 void
nir_lower_aapoint_fs(struct nir_shader * shader,int * varying)329 nir_lower_aapoint_fs(struct nir_shader *shader, int *varying)
330 {
331 lower_aapoint state = {
332 .shader = shader,
333 };
334 if (shader->info.stage != MESA_SHADER_FRAGMENT)
335 return;
336
337 int highest_location = -1, highest_drv_location = -1;
338 nir_foreach_shader_in_variable(var, shader) {
339 if ((int)var->data.location > highest_location)
340 highest_location = var->data.location;
341 if ((int)var->data.driver_location > highest_drv_location)
342 highest_drv_location = var->data.driver_location;
343 }
344
345 nir_variable *aapoint_input = nir_variable_create(shader, nir_var_shader_in,
346 glsl_vec4_type(), "aapoint");
347 if (highest_location == -1 || highest_location < VARYING_SLOT_VAR0) {
348 aapoint_input->data.location = VARYING_SLOT_VAR0;
349 } else {
350 aapoint_input->data.location = highest_location + 1;
351 }
352 aapoint_input->data.driver_location = highest_drv_location + 1;
353
354 shader->num_inputs++;
355 *varying = tgsi_get_generic_gl_varying_index(aapoint_input->data.location, true);
356 state.input = aapoint_input;
357
358 nir_foreach_function(function, shader) {
359 if (function->impl) {
360 nir_lower_aapoint_impl(function->impl, &state);
361 }
362 }
363 }
364