1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/*
* Copyright 2016, Blender Foundation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contributor(s): Blender Institute
*
*/
/** \file eevee_occlusion.c
* \ingroup draw_engine
*
* Implementation of the screen space Ground Truth Ambient Occlusion.
*/
#include "DRW_render.h"
#include "BLI_dynstr.h"
#include "DNA_anim_types.h"
#include "BKE_global.h" /* for G.debug_value */
#include "eevee_private.h"
static struct {
/* Ground Truth Ambient Occlusion */
struct GPUShader *gtao_sh;
struct GPUShader *gtao_layer_sh;
struct GPUShader *gtao_debug_sh;
struct GPUTexture *src_depth;
} e_data = {NULL}; /* Engine data */
extern char datatoc_ambient_occlusion_lib_glsl[];
extern char datatoc_bsdf_common_lib_glsl[];
extern char datatoc_effect_gtao_frag_glsl[];
static void eevee_create_shader_occlusion(void)
{
char *frag_str;
DRW_shader_create_lib(frag_str,
datatoc_bsdf_common_lib_glsl,
datatoc_ambient_occlusion_lib_glsl,
datatoc_effect_gtao_frag_glsl);
e_data.gtao_sh = DRW_shader_create_fullscreen(frag_str, NULL);
e_data.gtao_layer_sh = DRW_shader_create_fullscreen(frag_str, "#define LAYERED_DEPTH\n");
e_data.gtao_debug_sh = DRW_shader_create_fullscreen(frag_str, "#define DEBUG_AO\n");
MEM_freeN(frag_str);
}
int EEVEE_occlusion_init(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata)
{
EEVEE_StorageList *stl = vedata->stl;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_TextureList *txl = vedata->txl;
EEVEE_EffectsInfo *effects = stl->effects;
const DRWContextState *draw_ctx = DRW_context_state_get();
ViewLayer *view_layer = draw_ctx->view_layer;
IDProperty *props = BKE_view_layer_engine_evaluated_get(view_layer,
COLLECTION_MODE_NONE,
RE_engine_id_BLENDER_EEVEE);
if (BKE_collection_engine_property_value_get_bool(props, "gtao_enable")) {
const float *viewport_size = DRW_viewport_size_get();
/* Shaders */
if (!e_data.gtao_sh) {
eevee_create_shader_occlusion();
}
effects->ao_dist = BKE_collection_engine_property_value_get_float(props, "gtao_distance");
effects->ao_factor = BKE_collection_engine_property_value_get_float(props, "gtao_factor");
effects->ao_quality = 1.0f - BKE_collection_engine_property_value_get_float(props, "gtao_quality");
effects->ao_settings = 1.0; /* USE_AO */
if (BKE_collection_engine_property_value_get_bool(props, "gtao_use_bent_normals")) {
effects->ao_settings += 2.0; /* USE_BENT_NORMAL */
}
if (BKE_collection_engine_property_value_get_bool(props, "gtao_denoise")) {
effects->ao_settings += 4.0; /* USE_DENOISE */
}
effects->ao_bounce_fac = (float)BKE_collection_engine_property_value_get_bool(props, "gtao_bounce");
effects->ao_texsize[0] = ((int)viewport_size[0]);
effects->ao_texsize[1] = ((int)viewport_size[1]);
DRWFboTexture tex = {&txl->gtao_horizons, DRW_TEX_RGBA_8, 0};
DRW_framebuffer_init(&fbl->gtao_fb, &draw_engine_eevee_type,
(int)viewport_size[0], (int)viewport_size[1],
&tex, 1);
if (G.debug_value == 6) {
DRWFboTexture tex_debug = {&stl->g_data->gtao_horizons_debug, DRW_TEX_RGBA_8, DRW_TEX_TEMP};
DRW_framebuffer_init(&fbl->gtao_debug_fb, &draw_engine_eevee_type,
(int)viewport_size[0], (int)viewport_size[1],
&tex_debug, 1);
}
return EFFECT_GTAO | EFFECT_NORMAL_BUFFER;
}
/* Cleanup */
DRW_TEXTURE_FREE_SAFE(txl->gtao_horizons);
DRW_FRAMEBUFFER_FREE_SAFE(fbl->gtao_fb);
effects->ao_settings = 0.0f;
return 0;
}
void EEVEE_occlusion_cache_init(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata)
{
EEVEE_PassList *psl = vedata->psl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_TextureList *txl = vedata->txl;
EEVEE_EffectsInfo *effects = stl->effects;
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
struct Gwn_Batch *quad = DRW_cache_fullscreen_quad_get();
if ((effects->enabled_effects & EFFECT_GTAO) != 0) {
/** Occlusion algorithm overview
*
* We separate the computation into 2 steps.
*
* - First we scan the neighborhood pixels to find the maximum horizon angle.
* We save this angle in a RG8 array texture.
*
* - Then we use this angle to compute occlusion with the shading normal at
* the shading stage. This let us do correct shadowing for each diffuse / specular
* lobe present in the shader using the correct normal.
**/
psl->ao_horizon_search = DRW_pass_create("GTAO Horizon Search", DRW_STATE_WRITE_COLOR);
DRWShadingGroup *grp = DRW_shgroup_create(e_data.gtao_sh, psl->ao_horizon_search);
DRW_shgroup_uniform_buffer(grp, "maxzBuffer", &txl->maxzbuffer);
DRW_shgroup_uniform_buffer(grp, "depthBuffer", &effects->ao_src_depth);
DRW_shgroup_uniform_vec4(grp, "viewvecs[0]", (float *)stl->g_data->viewvecs, 2);
DRW_shgroup_uniform_vec2(grp, "mipRatio[0]", (float *)stl->g_data->mip_ratio, 10);
DRW_shgroup_uniform_vec4(grp, "aoParameters[0]", &stl->effects->ao_dist, 2);
DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_call_add(grp, quad, NULL);
psl->ao_horizon_search_layer = DRW_pass_create("GTAO Horizon Search Layer", DRW_STATE_WRITE_COLOR);
grp = DRW_shgroup_create(e_data.gtao_layer_sh, psl->ao_horizon_search_layer);
DRW_shgroup_uniform_buffer(grp, "maxzBuffer", &txl->maxzbuffer);
DRW_shgroup_uniform_buffer(grp, "depthBufferLayered", &effects->ao_src_depth);
DRW_shgroup_uniform_int(grp, "layer", &stl->effects->ao_depth_layer, 1);
DRW_shgroup_uniform_vec4(grp, "viewvecs[0]", (float *)stl->g_data->viewvecs, 2);
DRW_shgroup_uniform_vec2(grp, "mipRatio[0]", (float *)stl->g_data->mip_ratio, 10);
DRW_shgroup_uniform_vec4(grp, "aoParameters[0]", &stl->effects->ao_dist, 2);
DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_call_add(grp, quad, NULL);
if (G.debug_value == 6) {
psl->ao_horizon_debug = DRW_pass_create("GTAO Horizon Debug", DRW_STATE_WRITE_COLOR);
grp = DRW_shgroup_create(e_data.gtao_debug_sh, psl->ao_horizon_debug);
DRW_shgroup_uniform_buffer(grp, "maxzBuffer", &txl->maxzbuffer);
DRW_shgroup_uniform_buffer(grp, "depthBuffer", &dtxl->depth);
DRW_shgroup_uniform_buffer(grp, "normalBuffer", &txl->ssr_normal_input);
DRW_shgroup_uniform_buffer(grp, "horizonBuffer", &txl->gtao_horizons);
DRW_shgroup_uniform_vec4(grp, "viewvecs[0]", (float *)stl->g_data->viewvecs, 2);
DRW_shgroup_uniform_vec2(grp, "mipRatio[0]", (float *)stl->g_data->mip_ratio, 10);
DRW_shgroup_uniform_vec4(grp, "aoParameters[0]", &stl->effects->ao_dist, 2);
DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_call_add(grp, quad, NULL);
}
}
}
void EEVEE_occlusion_compute(
EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata, struct GPUTexture *depth_src, int layer)
{
EEVEE_PassList *psl = vedata->psl;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
if ((effects->enabled_effects & EFFECT_GTAO) != 0) {
DRW_stats_group_start("GTAO Horizon Scan");
effects->ao_src_depth = depth_src;
effects->ao_depth_layer = layer;
DRW_framebuffer_bind(fbl->gtao_fb);
if (layer >= 0) {
DRW_draw_pass(psl->ao_horizon_search_layer);
}
else {
DRW_draw_pass(psl->ao_horizon_search);
}
/* Restore */
DRW_framebuffer_bind(fbl->main);
DRW_stats_group_end();
}
}
void EEVEE_occlusion_draw_debug(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *vedata)
{
EEVEE_PassList *psl = vedata->psl;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
if (((effects->enabled_effects & EFFECT_GTAO) != 0) && (G.debug_value == 6)) {
DRW_stats_group_start("GTAO Debug");
DRW_framebuffer_texture_attach(fbl->gtao_debug_fb, stl->g_data->gtao_horizons_debug, 0, 0);
DRW_framebuffer_bind(fbl->gtao_debug_fb);
DRW_draw_pass(psl->ao_horizon_debug);
/* Restore */
DRW_framebuffer_texture_detach(stl->g_data->gtao_horizons_debug);
DRW_framebuffer_bind(fbl->main);
DRW_stats_group_end();
}
}
void EEVEE_occlusion_free(void)
{
DRW_SHADER_FREE_SAFE(e_data.gtao_sh);
DRW_SHADER_FREE_SAFE(e_data.gtao_layer_sh);
DRW_SHADER_FREE_SAFE(e_data.gtao_debug_sh);
}
|