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/*
* 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_string_utils.h"
#include "DNA_anim_types.h"
#include "DEG_depsgraph_query.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_common_view_lib_glsl[];
extern char datatoc_common_uniforms_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 = BLI_string_joinN(
datatoc_common_view_lib_glsl,
datatoc_common_uniforms_lib_glsl,
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 *sldata, EEVEE_Data *vedata)
{
EEVEE_CommonUniformBuffer *common_data = &sldata->common_data;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
const DRWContextState *draw_ctx = DRW_context_state_get();
const Scene *scene_eval = DEG_get_evaluated_scene(draw_ctx->depsgraph);
if (scene_eval->flag & SCE_EEVEE_GTAO_ENABLED) {
const float *viewport_size = DRW_viewport_size_get();
const int fs_size[2] = {(int)viewport_size[0], (int)viewport_size[1]};
/* Shaders */
if (!e_data.gtao_sh) {
eevee_create_shader_occlusion();
}
common_data->ao_dist = scene_eval->eevee.gtao_distance;
common_data->ao_factor = scene_eval->eevee.gtao_factor;
common_data->ao_quality = 1.0f - scene_eval->eevee.gtao_quality;
common_data->ao_settings = 1.0f; /* USE_AO */
if (scene_eval->flag & SCE_EEVEE_GTAO_BENT_NORMALS) {
common_data->ao_settings += 2.0f; /* USE_BENT_NORMAL */
}
if (scene_eval->flag & SCE_EEVEE_GTAO_BOUNCE) {
common_data->ao_settings += 4.0f; /* USE_DENOISE */
}
common_data->ao_bounce_fac = (scene_eval->flag & SCE_EEVEE_GTAO_BOUNCE) ? 1.0f : 0.0f;
effects->gtao_horizons = DRW_texture_pool_query_2D(fs_size[0], fs_size[1], GPU_RGBA8,
&draw_engine_eevee_type);
GPU_framebuffer_ensure_config(&fbl->gtao_fb, {
GPU_ATTACHMENT_NONE,
GPU_ATTACHMENT_TEXTURE(effects->gtao_horizons)
});
if (G.debug_value == 6) {
effects->gtao_horizons_debug = DRW_texture_pool_query_2D(fs_size[0], fs_size[1], GPU_RGBA8,
&draw_engine_eevee_type);
GPU_framebuffer_ensure_config(&fbl->gtao_debug_fb, {
GPU_ATTACHMENT_NONE,
GPU_ATTACHMENT_TEXTURE(effects->gtao_horizons_debug)
});
}
else {
effects->gtao_horizons_debug = NULL;
}
return EFFECT_GTAO | EFFECT_NORMAL_BUFFER;
}
/* Cleanup */
effects->gtao_horizons = NULL;
GPU_FRAMEBUFFER_FREE_SAFE(fbl->gtao_fb);
common_data->ao_settings = 0.0f;
return 0;
}
void EEVEE_occlusion_output_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_TextureList *txl = vedata->txl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_PassList *psl = vedata->psl;
EEVEE_EffectsInfo *effects = stl->effects;
const DRWContextState *draw_ctx = DRW_context_state_get();
const Scene *scene_eval = DEG_get_evaluated_scene(draw_ctx->depsgraph);
if (scene_eval->flag & SCE_EEVEE_GTAO_ENABLED) {
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
DRW_texture_ensure_fullscreen_2D(&txl->ao_accum, GPU_R32F, 0); /* Should be enough precision for many samples. */
GPU_framebuffer_ensure_config(&fbl->ao_accum_fb, {
GPU_ATTACHMENT_NONE,
GPU_ATTACHMENT_TEXTURE(txl->ao_accum)
});
/* Clear texture. */
GPU_framebuffer_bind(fbl->ao_accum_fb);
GPU_framebuffer_clear_color(fbl->ao_accum_fb, clear);
/* Accumulation pass */
DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_ADDITIVE;
psl->ao_accum_ps = DRW_pass_create("AO Accum", state);
DRWShadingGroup *grp = DRW_shgroup_create(e_data.gtao_debug_sh, psl->ao_accum_ps);
DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_uniform_texture_ref(grp, "maxzBuffer", &txl->maxzbuffer);
DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &dtxl->depth);
DRW_shgroup_uniform_texture_ref(grp, "normalBuffer", &effects->ssr_normal_input);
DRW_shgroup_uniform_texture_ref(grp, "horizonBuffer", &effects->gtao_horizons);
DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
DRW_shgroup_call_add(grp, DRW_cache_fullscreen_quad_get(), NULL);
}
else {
/* Cleanup to release memory */
DRW_TEXTURE_FREE_SAFE(txl->ao_accum);
GPU_FRAMEBUFFER_FREE_SAFE(fbl->ao_accum_fb);
}
}
void EEVEE_occlusion_cache_init(EEVEE_ViewLayerData *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_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_uniform_texture_ref(grp, "maxzBuffer", &txl->maxzbuffer);
DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &effects->ao_src_depth);
DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
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_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_uniform_texture_ref(grp, "maxzBuffer", &txl->maxzbuffer);
DRW_shgroup_uniform_texture_ref(grp, "depthBufferLayered", &effects->ao_src_depth);
DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
DRW_shgroup_uniform_int(grp, "layer", &stl->effects->ao_depth_layer, 1);
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_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_uniform_texture_ref(grp, "maxzBuffer", &txl->maxzbuffer);
DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", &dtxl->depth);
DRW_shgroup_uniform_texture_ref(grp, "normalBuffer", &effects->ssr_normal_input);
DRW_shgroup_uniform_texture_ref(grp, "horizonBuffer", &effects->gtao_horizons);
DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
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;
GPU_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 */
GPU_framebuffer_bind(fbl->main_fb);
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");
GPU_framebuffer_bind(fbl->gtao_debug_fb);
DRW_draw_pass(psl->ao_horizon_debug);
/* Restore */
GPU_framebuffer_bind(fbl->main_fb);
DRW_stats_group_end();
}
}
void EEVEE_occlusion_output_accumulate(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_PassList *psl = vedata->psl;
if (fbl->ao_accum_fb != NULL) {
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
/* Update the min_max/horizon buffers so the refracion materials appear in it. */
EEVEE_create_minmax_buffer(vedata, dtxl->depth, -1);
EEVEE_occlusion_compute(sldata, vedata, dtxl->depth, -1);
GPU_framebuffer_bind(fbl->ao_accum_fb);
DRW_draw_pass(psl->ao_accum_ps);
/* Restore */
GPU_framebuffer_bind(fbl->main_fb);
}
}
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);
}
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