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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_subsurface.c
* \ingroup draw_engine
*
* Screen space subsurface scattering technique.
*/
#include "DRW_render.h"
#include "BLI_dynstr.h"
#include "eevee_private.h"
#include "GPU_texture.h"
static struct {
struct GPUShader *sss_sh[2];
} e_data = {NULL}; /* Engine data */
extern char datatoc_effect_subsurface_frag_glsl[];
static void eevee_create_shader_subsurface(void)
{
e_data.sss_sh[0] = DRW_shader_create_fullscreen(datatoc_effect_subsurface_frag_glsl, "#define FIRST_PASS\n");
e_data.sss_sh[1] = DRW_shader_create_fullscreen(datatoc_effect_subsurface_frag_glsl, "#define SECOND_PASS\n");
}
int EEVEE_subsurface_init(EEVEE_SceneLayerData *UNUSED(sldata), EEVEE_Data *vedata)
{
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_TextureList *txl = vedata->txl;
const float *viewport_size = DRW_viewport_size_get();
const DRWContextState *draw_ctx = DRW_context_state_get();
SceneLayer *scene_layer = draw_ctx->scene_layer;
IDProperty *props = BKE_scene_layer_engine_evaluated_get(scene_layer, COLLECTION_MODE_NONE, RE_engine_id_BLENDER_EEVEE);
if (BKE_collection_engine_property_value_get_bool(props, "sss_enable")) {
effects->sss_sample_count = 1 + BKE_collection_engine_property_value_get_int(props, "sss_samples") * 2;
effects->sss_jitter_threshold = BKE_collection_engine_property_value_get_float(props, "sss_jitter_threshold");
/* Shaders */
if (!e_data.sss_sh[0]) {
eevee_create_shader_subsurface();
}
/* NOTE : we need another stencil because the stencil buffer is on the same texture
* as the depth buffer we are sampling from. This could be avoided if the stencil is
* a separate texture but that needs OpenGL 4.4 or ARB_texture_stencil8.
* OR OpenGL 4.3 / ARB_ES3_compatibility if using a renderbuffer instead */
DRWFboTexture texs[2] = {{&txl->sss_stencil, DRW_TEX_DEPTH_24_STENCIL_8, 0},
{&txl->sss_blur, DRW_TEX_RGBA_16, DRW_TEX_FILTER}};
DRW_framebuffer_init(&fbl->sss_blur_fb, &draw_engine_eevee_type, (int)viewport_size[0], (int)viewport_size[1],
texs, 2);
DRWFboTexture tex_data = {&txl->sss_data, DRW_TEX_RGBA_16, DRW_TEX_FILTER};
DRW_framebuffer_init(&fbl->sss_clear_fb, &draw_engine_eevee_type, (int)viewport_size[0], (int)viewport_size[1],
&tex_data, 1);
return EFFECT_SSS;
}
/* Cleanup to release memory */
DRW_TEXTURE_FREE_SAFE(txl->sss_data);
DRW_TEXTURE_FREE_SAFE(txl->sss_blur);
DRW_TEXTURE_FREE_SAFE(txl->sss_stencil);
DRW_FRAMEBUFFER_FREE_SAFE(fbl->sss_blur_fb);
DRW_FRAMEBUFFER_FREE_SAFE(fbl->sss_clear_fb);
return 0;
}
void EEVEE_subsurface_cache_init(EEVEE_SceneLayerData *UNUSED(sldata), EEVEE_Data *vedata)
{
EEVEE_PassList *psl = vedata->psl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
if ((effects->enabled_effects & EFFECT_SSS) != 0) {
/** Screen Space SubSurface Scattering overview
* TODO
*/
psl->sss_blur_ps = DRW_pass_create("Blur Horiz", DRW_STATE_WRITE_COLOR | DRW_STATE_STENCIL_EQUAL);
psl->sss_resolve_ps = DRW_pass_create("Blur Vert", DRW_STATE_WRITE_COLOR | DRW_STATE_ADDITIVE | DRW_STATE_STENCIL_EQUAL);
}
}
void EEVEE_subsurface_add_pass(EEVEE_Data *vedata, unsigned int sss_id, struct GPUUniformBuffer *sss_profile)
{
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
EEVEE_TextureList *txl = vedata->txl;
EEVEE_PassList *psl = vedata->psl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
struct Gwn_Batch *quad = DRW_cache_fullscreen_quad_get();
DRWShadingGroup *grp = DRW_shgroup_create(e_data.sss_sh[0], psl->sss_blur_ps);
DRW_shgroup_uniform_vec4(grp, "viewvecs[0]", (float *)vedata->stl->g_data->viewvecs, 2);
DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_uniform_buffer(grp, "depthBuffer", &dtxl->depth);
DRW_shgroup_uniform_buffer(grp, "sssData", &txl->sss_data);
DRW_shgroup_uniform_block(grp, "sssProfile", sss_profile);
DRW_shgroup_uniform_float(grp, "jitterThreshold", &effects->sss_jitter_threshold, 1);
DRW_shgroup_stencil_mask(grp, sss_id);
DRW_shgroup_call_add(grp, quad, NULL);
grp = DRW_shgroup_create(e_data.sss_sh[1], psl->sss_resolve_ps);
DRW_shgroup_uniform_vec4(grp, "viewvecs[0]", (float *)vedata->stl->g_data->viewvecs, 2);
DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_uniform_buffer(grp, "depthBuffer", &dtxl->depth);
DRW_shgroup_uniform_buffer(grp, "sssData", &txl->sss_blur);
DRW_shgroup_uniform_block(grp, "sssProfile", sss_profile);
DRW_shgroup_uniform_float(grp, "jitterThreshold", &effects->sss_jitter_threshold, 1);
DRW_shgroup_stencil_mask(grp, sss_id);
DRW_shgroup_call_add(grp, quad, NULL);
}
void EEVEE_subsurface_data_render(EEVEE_SceneLayerData *UNUSED(sldata), EEVEE_Data *vedata)
{
EEVEE_PassList *psl = vedata->psl;
EEVEE_TextureList *txl = vedata->txl;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
if ((effects->enabled_effects & EFFECT_SSS) != 0) {
float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
/* Clear sss_data texture only... can this be done in a more clever way? */
DRW_framebuffer_bind(fbl->sss_clear_fb);
DRW_framebuffer_clear(true, false, false, clear, 0.0f);
if ((effects->enabled_effects & EFFECT_NORMAL_BUFFER) != 0) {
DRW_framebuffer_texture_detach(txl->ssr_normal_input);
}
if ((effects->enabled_effects & EFFECT_SSR) != 0) {
DRW_framebuffer_texture_detach(txl->ssr_specrough_input);
}
if ((effects->enabled_effects & EFFECT_NORMAL_BUFFER) != 0) {
DRW_framebuffer_texture_attach(fbl->main, txl->ssr_normal_input, 2, 0);
}
if ((effects->enabled_effects & EFFECT_SSR) != 0) {
DRW_framebuffer_texture_attach(fbl->main, txl->ssr_specrough_input, 3, 0);
}
DRW_framebuffer_texture_detach(txl->sss_data);
DRW_framebuffer_texture_attach(fbl->main, txl->sss_data, 1, 0);
DRW_framebuffer_bind(fbl->main);
DRW_draw_pass(psl->sss_pass);
if ((effects->enabled_effects & EFFECT_NORMAL_BUFFER) != 0) {
DRW_framebuffer_texture_detach(txl->ssr_normal_input);
}
if ((effects->enabled_effects & EFFECT_SSR) != 0) {
DRW_framebuffer_texture_detach(txl->ssr_specrough_input);
}
DRW_framebuffer_texture_detach(txl->sss_data);
if ((effects->enabled_effects & EFFECT_NORMAL_BUFFER) != 0) {
DRW_framebuffer_texture_attach(fbl->main, txl->ssr_normal_input, 1, 0);
}
if ((effects->enabled_effects & EFFECT_SSR) != 0) {
DRW_framebuffer_texture_attach(fbl->main, txl->ssr_specrough_input, 2, 0);
}
DRW_framebuffer_texture_attach(fbl->sss_clear_fb, txl->sss_data, 0, 0);
}
}
void EEVEE_subsurface_compute(EEVEE_SceneLayerData *UNUSED(sldata), EEVEE_Data *vedata)
{
EEVEE_PassList *psl = vedata->psl;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_TextureList *txl = vedata->txl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
if ((effects->enabled_effects & EFFECT_SSS) != 0) {
float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
DRW_stats_group_start("SSS");
/* Copy stencil channel, could be avoided (see EEVEE_subsurface_init) */
DRW_framebuffer_blit(fbl->main, fbl->sss_blur_fb, false, true);
DRW_framebuffer_texture_detach(dtxl->depth);
/* First horizontal pass */
DRW_framebuffer_bind(fbl->sss_blur_fb);
DRW_framebuffer_clear(true, false, false, clear, 0.0f);
DRW_draw_pass(psl->sss_blur_ps);
/* First vertical pass + Resolve */
DRW_framebuffer_texture_detach(txl->sss_stencil);
DRW_framebuffer_texture_attach(fbl->main, txl->sss_stencil, 0, 0);
DRW_framebuffer_bind(fbl->main);
DRW_draw_pass(psl->sss_resolve_ps);
/* Restore */
DRW_framebuffer_texture_detach(txl->sss_stencil);
DRW_framebuffer_texture_attach(fbl->sss_blur_fb, txl->sss_stencil, 0, 0);
DRW_framebuffer_texture_attach(fbl->main, dtxl->depth, 0, 0);
DRW_stats_group_end();
}
}
void EEVEE_subsurface_free(void)
{
DRW_SHADER_FREE_SAFE(e_data.sss_sh[0]);
DRW_SHADER_FREE_SAFE(e_data.sss_sh[1]);
}
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