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/*
* 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.
*
* Copyright 2016, Blender Foundation.
*/
/** \file
* \ingroup draw_engine
*
* Screen space subsurface scattering technique.
*/
#include "DRW_render.h"
#include "BLI_string_utils.h"
#include "DEG_depsgraph_query.h"
#include "GPU_extensions.h"
#include "GPU_material.h"
#include "GPU_texture.h"
#include "eevee_private.h"
static struct {
struct GPUShader *sss_sh[3];
} e_data = {{NULL}}; /* Engine data */
extern char datatoc_effect_subsurface_frag_glsl[];
extern char datatoc_effect_translucency_frag_glsl[];
static void eevee_create_shader_subsurface(void)
{
DRWShaderLibrary *lib = EEVEE_shader_lib_get();
e_data.sss_sh[0] = DRW_shader_create_fullscreen_with_shaderlib(
datatoc_effect_subsurface_frag_glsl, lib, "#define FIRST_PASS\n");
e_data.sss_sh[1] = DRW_shader_create_fullscreen_with_shaderlib(
datatoc_effect_subsurface_frag_glsl, lib, "#define SECOND_PASS\n");
e_data.sss_sh[2] = DRW_shader_create_fullscreen_with_shaderlib(
datatoc_effect_translucency_frag_glsl, lib, "#define EEVEE_TRANSLUCENCY\n" SHADER_DEFINES);
}
void EEVEE_subsurface_init(EEVEE_ViewLayerData *UNUSED(sldata), EEVEE_Data *UNUSED(vedata))
{
}
void EEVEE_subsurface_draw_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
EEVEE_EffectsInfo *effects = vedata->stl->effects;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_TextureList *txl = vedata->txl;
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
const float *viewport_size = DRW_viewport_size_get();
const int fs_size[2] = {(int)viewport_size[0], (int)viewport_size[1]};
if (effects->enabled_effects & EFFECT_SSS) {
/* 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 */
effects->sss_stencil = DRW_texture_pool_query_2d(
fs_size[0], fs_size[1], GPU_DEPTH24_STENCIL8, &draw_engine_eevee_type);
effects->sss_blur = DRW_texture_pool_query_2d(
fs_size[0], fs_size[1], GPU_R11F_G11F_B10F, &draw_engine_eevee_type);
effects->sss_irradiance = DRW_texture_pool_query_2d(
fs_size[0], fs_size[1], GPU_R11F_G11F_B10F, &draw_engine_eevee_type);
effects->sss_radius = DRW_texture_pool_query_2d(
fs_size[0], fs_size[1], GPU_R16F, &draw_engine_eevee_type);
effects->sss_albedo = DRW_texture_pool_query_2d(
fs_size[0], fs_size[1], GPU_R11F_G11F_B10F, &draw_engine_eevee_type);
GPUTexture *stencil_tex = effects->sss_stencil;
if (GPU_depth_blitting_workaround()) {
/* Blitting stencil buffer does not work on macOS + Radeon Pro.
* Blit depth instead and use sss_stencil's depth as depth texture,
* and dtxl->depth as stencil mask. */
GPU_framebuffer_ensure_config(
&fbl->sss_blit_fb, {GPU_ATTACHMENT_TEXTURE(effects->sss_stencil), GPU_ATTACHMENT_NONE});
stencil_tex = dtxl->depth;
}
GPU_framebuffer_ensure_config(
&fbl->sss_blur_fb,
{GPU_ATTACHMENT_TEXTURE(stencil_tex), GPU_ATTACHMENT_TEXTURE(effects->sss_blur)});
GPU_framebuffer_ensure_config(
&fbl->sss_resolve_fb,
{GPU_ATTACHMENT_TEXTURE(stencil_tex), GPU_ATTACHMENT_TEXTURE(txl->color)});
GPU_framebuffer_ensure_config(
&fbl->sss_translucency_fb,
{GPU_ATTACHMENT_TEXTURE(stencil_tex), GPU_ATTACHMENT_TEXTURE(effects->sss_irradiance)});
GPU_framebuffer_ensure_config(&fbl->sss_clear_fb,
{GPU_ATTACHMENT_NONE,
GPU_ATTACHMENT_TEXTURE(effects->sss_irradiance),
GPU_ATTACHMENT_TEXTURE(effects->sss_radius)});
if ((stl->g_data->render_passes & EEVEE_RENDER_PASS_DIFFUSE_LIGHT) != 0) {
EEVEE_subsurface_output_init(sldata, vedata, 0);
}
else {
GPU_FRAMEBUFFER_FREE_SAFE(fbl->sss_accum_fb);
DRW_TEXTURE_FREE_SAFE(txl->sss_accum);
}
}
else {
/* Cleanup to release memory */
GPU_FRAMEBUFFER_FREE_SAFE(fbl->sss_blur_fb);
GPU_FRAMEBUFFER_FREE_SAFE(fbl->sss_resolve_fb);
GPU_FRAMEBUFFER_FREE_SAFE(fbl->sss_clear_fb);
GPU_FRAMEBUFFER_FREE_SAFE(fbl->sss_accum_fb);
DRW_TEXTURE_FREE_SAFE(txl->sss_accum);
effects->sss_stencil = NULL;
effects->sss_blur = NULL;
effects->sss_irradiance = NULL;
effects->sss_radius = NULL;
}
}
void EEVEE_subsurface_output_init(EEVEE_ViewLayerData *UNUSED(sldata),
EEVEE_Data *vedata,
uint UNUSED(tot_samples))
{
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_TextureList *txl = vedata->txl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
const eGPUTextureFormat texture_format_light = GPU_RGBA32F;
const bool texture_created = txl->sss_accum == NULL;
DRW_texture_ensure_fullscreen_2d(&txl->sss_accum, texture_format_light, 0);
GPUTexture *stencil_tex = effects->sss_stencil;
if (GPU_depth_blitting_workaround()) {
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
/* Blitting stencil buffer does not work on macOS + Radeon Pro.
* Blit depth instead and use sss_stencil's depth as depth texture,
* and dtxl->depth as stencil mask. */
stencil_tex = dtxl->depth;
}
GPU_framebuffer_ensure_config(
&fbl->sss_accum_fb,
{GPU_ATTACHMENT_TEXTURE(stencil_tex), GPU_ATTACHMENT_TEXTURE(txl->sss_accum)});
/* Clear texture.
* Due to the late initialization of the SSS it can happen that the `taa_current_sample` is
* already higher than one. This is noticeable when loading a file that has the diffuse light
* pass in look dev mode active. `texture_created` will make sure that newly created textures
* are cleared. */
if (effects->taa_current_sample == 1 || texture_created) {
const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
GPU_framebuffer_bind(fbl->sss_accum_fb);
GPU_framebuffer_clear_color(fbl->sss_accum_fb, clear);
}
}
void EEVEE_subsurface_cache_init(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
EEVEE_CommonUniformBuffer *common_data = &sldata->common_data;
EEVEE_EffectsInfo *effects = vedata->stl->effects;
EEVEE_PassList *psl = vedata->psl;
const DRWContextState *draw_ctx = DRW_context_state_get();
const Scene *scene_eval = DEG_get_evaluated_scene(draw_ctx->depsgraph);
/* Shaders */
if (!e_data.sss_sh[0]) {
eevee_create_shader_subsurface();
}
effects->sss_sample_count = 1 + scene_eval->eevee.sss_samples * 2;
effects->sss_surface_count = 0;
common_data->sss_jitter_threshold = scene_eval->eevee.sss_jitter_threshold;
/** Screen Space SubSurface Scattering overview
* TODO
*/
DRWState state = DRW_STATE_WRITE_COLOR | DRW_STATE_STENCIL_EQUAL;
DRW_PASS_CREATE(psl->sss_blur_ps, state);
DRW_PASS_CREATE(psl->sss_resolve_ps, state | DRW_STATE_BLEND_ADD);
DRW_PASS_CREATE(psl->sss_translucency_ps, state | DRW_STATE_BLEND_ADD);
}
void EEVEE_subsurface_add_pass(EEVEE_ViewLayerData *sldata,
EEVEE_Data *vedata,
Material *ma,
DRWShadingGroup *shgrp,
struct GPUMaterial *gpumat)
{
EEVEE_PassList *psl = vedata->psl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_EffectsInfo *effects = stl->effects;
DefaultTextureList *dtxl = DRW_viewport_texture_list_get();
GPUTexture **depth_src = GPU_depth_blitting_workaround() ? &effects->sss_stencil : &dtxl->depth;
struct GPUTexture *sss_tex_profile = NULL;
struct GPUUniformBuf *sss_profile = GPU_material_sss_profile_get(
gpumat, stl->effects->sss_sample_count, &sss_tex_profile);
if (!sss_profile) {
BLI_assert(0 && "SSS pass requested but no SSS data was found");
return;
}
/* Limit of 8 bit stencil buffer. ID 255 is refraction. */
if (effects->sss_surface_count >= 254) {
/* TODO : display message. */
printf("Error: Too many different Subsurface shader in the scene.\n");
return;
}
int sss_id = ++(effects->sss_surface_count);
/* Make main pass output stencil mask. */
DRW_shgroup_stencil_mask(shgrp, sss_id);
{
DRWShadingGroup *grp = DRW_shgroup_create(e_data.sss_sh[0], psl->sss_blur_ps);
DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", depth_src);
DRW_shgroup_uniform_texture_ref(grp, "sssIrradiance", &effects->sss_irradiance);
DRW_shgroup_uniform_texture_ref(grp, "sssRadius", &effects->sss_radius);
DRW_shgroup_uniform_block(grp, "sssProfile", sss_profile);
DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
DRW_shgroup_uniform_block(grp, "renderpass_block", sldata->renderpass_ubo.combined);
DRW_shgroup_stencil_mask(grp, sss_id);
DRW_shgroup_call_procedural_triangles(grp, NULL, 1);
grp = DRW_shgroup_create(e_data.sss_sh[1], psl->sss_resolve_ps);
DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", depth_src);
DRW_shgroup_uniform_texture_ref(grp, "sssIrradiance", &effects->sss_blur);
DRW_shgroup_uniform_texture_ref(grp, "sssAlbedo", &effects->sss_albedo);
DRW_shgroup_uniform_texture_ref(grp, "sssRadius", &effects->sss_radius);
DRW_shgroup_uniform_block(grp, "sssProfile", sss_profile);
DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
DRW_shgroup_uniform_block(grp, "renderpass_block", sldata->renderpass_ubo.combined);
DRW_shgroup_stencil_mask(grp, sss_id);
DRW_shgroup_call_procedural_triangles(grp, NULL, 1);
}
if (ma->blend_flag & MA_BL_TRANSLUCENCY) {
DRWShadingGroup *grp = DRW_shgroup_create(e_data.sss_sh[2], psl->sss_translucency_ps);
DRW_shgroup_uniform_texture(grp, "utilTex", EEVEE_materials_get_util_tex());
DRW_shgroup_uniform_texture(grp, "sssTexProfile", sss_tex_profile);
DRW_shgroup_uniform_texture_ref(grp, "depthBuffer", depth_src);
DRW_shgroup_uniform_texture_ref(grp, "sssRadius", &effects->sss_radius);
DRW_shgroup_uniform_texture_ref(grp, "sssShadowCubes", &sldata->shadow_cube_pool);
DRW_shgroup_uniform_texture_ref(grp, "sssShadowCascades", &sldata->shadow_cascade_pool);
DRW_shgroup_uniform_block(grp, "sssProfile", sss_profile);
DRW_shgroup_uniform_block(grp, "light_block", sldata->light_ubo);
DRW_shgroup_uniform_block(grp, "shadow_block", sldata->shadow_ubo);
DRW_shgroup_uniform_block(grp, "common_block", sldata->common_ubo);
DRW_shgroup_uniform_block(grp, "renderpass_block", sldata->renderpass_ubo.combined);
DRW_shgroup_stencil_mask(grp, sss_id);
DRW_shgroup_call_procedural_triangles(grp, NULL, 1);
}
}
void EEVEE_subsurface_data_render(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_SSS) != 0) {
const 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? */
GPU_framebuffer_bind(fbl->sss_clear_fb);
GPU_framebuffer_clear_color(fbl->sss_clear_fb, clear);
GPU_framebuffer_ensure_config(&fbl->main_fb,
{GPU_ATTACHMENT_LEAVE,
GPU_ATTACHMENT_LEAVE,
GPU_ATTACHMENT_LEAVE,
GPU_ATTACHMENT_LEAVE,
GPU_ATTACHMENT_TEXTURE(effects->sss_irradiance),
GPU_ATTACHMENT_TEXTURE(effects->sss_radius),
GPU_ATTACHMENT_TEXTURE(effects->sss_albedo)});
GPU_framebuffer_bind(fbl->main_fb);
DRW_draw_pass(psl->material_sss_ps);
/* Restore */
GPU_framebuffer_ensure_config(&fbl->main_fb,
{GPU_ATTACHMENT_LEAVE,
GPU_ATTACHMENT_LEAVE,
GPU_ATTACHMENT_LEAVE,
GPU_ATTACHMENT_LEAVE,
GPU_ATTACHMENT_NONE,
GPU_ATTACHMENT_NONE,
GPU_ATTACHMENT_NONE});
}
}
void EEVEE_subsurface_compute(EEVEE_ViewLayerData *sldata, EEVEE_Data *vedata)
{
EEVEE_PassList *psl = vedata->psl;
EEVEE_StorageList *stl = vedata->stl;
EEVEE_TextureList *txl = vedata->txl;
EEVEE_FramebufferList *fbl = vedata->fbl;
EEVEE_EffectsInfo *effects = stl->effects;
if ((effects->enabled_effects & EFFECT_SSS) != 0) {
const float clear[4] = {0.0f, 0.0f, 0.0f, 0.0f};
DRW_stats_group_start("SSS");
if (GPU_depth_blitting_workaround()) {
/* Copy depth channel */
GPU_framebuffer_blit(fbl->main_fb, 0, fbl->sss_blit_fb, 0, GPU_DEPTH_BIT);
}
else {
/* Copy stencil channel, could be avoided (see EEVEE_subsurface_init) */
GPU_framebuffer_blit(fbl->main_fb, 0, fbl->sss_blur_fb, 0, GPU_STENCIL_BIT);
}
if (!DRW_pass_is_empty(psl->sss_translucency_ps)) {
/* We sample the shadow-maps using normal sampler. We need to disable Comparison mode.
* TODO(fclem) avoid this by using sampler objects.*/
GPU_texture_compare_mode(sldata->shadow_cube_pool, false);
GPU_texture_compare_mode(sldata->shadow_cascade_pool, false);
GPU_framebuffer_bind(fbl->sss_translucency_fb);
DRW_draw_pass(psl->sss_translucency_ps);
/* Reset original state. */
GPU_texture_compare_mode(sldata->shadow_cube_pool, true);
GPU_texture_compare_mode(sldata->shadow_cascade_pool, true);
}
/* 1. horizontal pass */
GPU_framebuffer_bind(fbl->sss_blur_fb);
GPU_framebuffer_clear_color(fbl->sss_blur_fb, clear);
DRW_draw_pass(psl->sss_blur_ps);
/* 2. vertical pass + Resolve */
GPU_framebuffer_texture_attach(fbl->sss_resolve_fb, txl->color, 0, 0);
GPU_framebuffer_bind(fbl->sss_resolve_fb);
DRW_draw_pass(psl->sss_resolve_ps);
GPU_framebuffer_bind(fbl->main_fb);
DRW_stats_group_end();
}
}
void EEVEE_subsurface_output_accumulate(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_SSS) != 0) && (fbl->sss_accum_fb != NULL)) {
/* Copy stencil channel, could be avoided (see EEVEE_subsurface_init) */
GPU_framebuffer_blit(fbl->main_fb, 0, fbl->sss_accum_fb, 0, GPU_STENCIL_BIT);
/* Only do vertical pass + Resolve */
GPU_framebuffer_bind(fbl->sss_accum_fb);
DRW_draw_pass(psl->sss_resolve_ps);
/* Restore */
GPU_framebuffer_bind(fbl->main_fb);
}
}
void EEVEE_subsurface_free(void)
{
DRW_SHADER_FREE_SAFE(e_data.sss_sh[0]);
DRW_SHADER_FREE_SAFE(e_data.sss_sh[1]);
DRW_SHADER_FREE_SAFE(e_data.sss_sh[2]);
}
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