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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2021 Blender Foundation.
*/
/** \file
* \ingroup eevee
*/
#include "BLI_map.hh"
#include "DEG_depsgraph_query.h"
#include "eevee_instance.hh"
#include "eevee_sampling.hh"
#include "eevee_shader_shared.hh"
#include "eevee_velocity.hh"
namespace blender::eevee {
/* -------------------------------------------------------------------- */
/** \name MotionBlurModule
*
* \{ */
void MotionBlurModule::init(void)
{
const Scene *scene = inst_.scene;
enabled_ = (scene->eevee.flag & SCE_EEVEE_MOTION_BLUR_ENABLED) != 0;
/* Viewport not supported for now. */
if (!DRW_state_is_scene_render()) {
enabled_ = false;
}
if (!enabled_) {
motion_blur_fx_enabled_ = false;
return;
}
/* Take into account the steps needed for fx motion blur. */
int steps_count = max_ii(1, scene->eevee.motion_blur_steps) * 2 + 1;
time_steps_.resize(steps_count);
initial_frame_ = CFRA;
initial_subframe_ = SUBFRA;
frame_time_ = initial_frame_ + initial_subframe_;
motion_blur_position_ = scene->eevee.motion_blur_position;
motion_blur_shutter_ = scene->eevee.motion_blur_shutter;
/* Without this there is the possibility of the curve table not being allocated. */
BKE_curvemapping_changed((struct CurveMapping *)&scene->r.mblur_shutter_curve, false);
Vector<float> cdf(CM_TABLE);
Sampling::cdf_from_curvemapping(scene->r.mblur_shutter_curve, cdf);
Sampling::cdf_invert(cdf, time_steps_);
for (float &time : time_steps_) {
time = this->shutter_time_to_scene_time(time);
}
motion_blur_fx_enabled_ = scene->eevee.motion_blur_max > 0.5f;
step_id_ = 1;
if (motion_blur_fx_enabled_) {
/* A bit weird but we have to sync the first 2 steps here because the step()
* function is only called after rendering a sample. */
inst_.velocity.step_sync(VelocityModule::STEP_PREVIOUS, time_steps_[0]);
inst_.velocity.step_sync(VelocityModule::STEP_NEXT, time_steps_[2]);
}
inst_.set_time(time_steps_[1]);
}
/* Runs after rendering a sample. */
void MotionBlurModule::step(void)
{
if (!enabled_) {
return;
}
else if (inst_.sampling.finished()) {
/* Restore original frame number. This is because the render pipeline expects it. */
RE_engine_frame_set(inst_.render, initial_frame_, initial_subframe_);
}
else if (inst_.sampling.do_render_sync()) {
/* Time to change motion step. */
BLI_assert(time_steps_.size() > step_id_ + 2);
step_id_ += 2;
if (motion_blur_fx_enabled_) {
inst_.velocity.step_swap();
inst_.velocity.step_sync(VelocityModule::STEP_NEXT, time_steps_[step_id_ + 1]);
}
inst_.set_time(time_steps_[step_id_]);
}
}
float MotionBlurModule::shutter_time_to_scene_time(float time)
{
switch (motion_blur_position_) {
case SCE_EEVEE_MB_START:
/* No offset. */
break;
case SCE_EEVEE_MB_CENTER:
time -= 0.5f;
break;
case SCE_EEVEE_MB_END:
time -= 1.0;
break;
default:
BLI_assert(!"Invalid motion blur position enum!");
break;
}
time *= motion_blur_shutter_;
time += frame_time_;
return time;
}
/** \} */
/* -------------------------------------------------------------------- */
/** \name MotionBlur
*
* \{ */
void MotionBlur::init()
{
const Scene *scene = inst_.scene;
data_.blur_max = scene->eevee.motion_blur_max;
data_.depth_scale = scene->eevee.motion_blur_depth_scale;
enabled_ = ((scene->eevee.flag & SCE_EEVEE_MOTION_BLUR_ENABLED) != 0) && (data_.blur_max > 0.5f);
}
void MotionBlur::sync(int extent[2])
{
if (!enabled_) {
return;
}
DrawEngineType *owner = (DrawEngineType *)view_name_.c_str();
eGPUSamplerState no_filter = GPU_SAMPLER_DEFAULT;
uint res[2] = {divide_ceil_u(extent[0], MB_TILE_DIVISOR),
divide_ceil_u(extent[1], MB_TILE_DIVISOR)};
{
/* Create max velocity tiles in 2 passes. One for X and one for Y */
DRW_PASS_CREATE(tiles_flatten_ps_, DRW_STATE_WRITE_COLOR);
GPUShader *sh = inst_.shaders.static_shader_get(MOTION_BLUR_TILE_FLATTEN);
DRWShadingGroup *grp = DRW_shgroup_create(sh, tiles_flatten_ps_);
DRW_shgroup_uniform_texture_ref_ex(grp, "velocity_tx", &input_velocity_tx_, no_filter);
DRW_shgroup_uniform_block(grp, "motion_blur_buf", data_);
DRW_shgroup_call_procedural_triangles(grp, nullptr, 1);
tiles_tx_ = DRW_texture_pool_query_2d(UNPACK2(res), GPU_RGBA16F, owner);
tiles_flatten_fb_.ensure(GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(tiles_tx_));
}
{
/* Expand max tiles by keeping the max tile in each tile neighborhood. */
DRW_PASS_CREATE(tiles_dilate_ps_, DRW_STATE_WRITE_COLOR);
GPUShader *sh = inst_.shaders.static_shader_get(MOTION_BLUR_TILE_DILATE);
DRWShadingGroup *grp = DRW_shgroup_create(sh, tiles_dilate_ps_);
DRW_shgroup_uniform_texture_ref_ex(grp, "tiles_tx", &tiles_tx_, no_filter);
DRW_shgroup_uniform_block(grp, "motion_blur_buf", data_);
DRW_shgroup_call_procedural_triangles(grp, nullptr, 1);
tiles_dilated_tx_ = DRW_texture_pool_query_2d(UNPACK2(res), GPU_RGBA16F, owner);
tiles_dilate_fb_.ensure(GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(tiles_dilated_tx_));
}
{
data_.target_size_inv[0] = 1.0f / extent[0];
data_.target_size_inv[1] = 1.0f / extent[1];
/* Do the motion blur gather algorithm. */
DRW_PASS_CREATE(gather_ps_, DRW_STATE_WRITE_COLOR);
GPUShader *sh = inst_.shaders.static_shader_get(MOTION_BLUR_GATHER);
DRWShadingGroup *grp = DRW_shgroup_create(sh, gather_ps_);
DRW_shgroup_uniform_block(grp, "sampling_buf", inst_.sampling.ubo_get());
DRW_shgroup_uniform_block(grp, "motion_blur_buf", data_);
DRW_shgroup_uniform_texture_ref(grp, "color_tx", &input_color_tx_);
DRW_shgroup_uniform_texture_ref(grp, "depth_tx", &input_depth_tx_);
DRW_shgroup_uniform_texture_ref_ex(grp, "velocity_tx", &input_velocity_tx_, no_filter);
DRW_shgroup_uniform_texture_ref_ex(grp, "tiles_tx", &tiles_dilated_tx_, no_filter);
DRW_shgroup_call_procedural_triangles(grp, nullptr, 1);
}
data_.is_viewport = !DRW_state_is_image_render();
data_.push_update();
}
void MotionBlur::render(GPUTexture *depth_tx,
GPUTexture *velocity_tx,
GPUTexture **input_tx,
GPUTexture **output_tx)
{
if (!enabled_) {
return;
}
input_color_tx_ = *input_tx;
input_depth_tx_ = depth_tx;
input_velocity_tx_ = velocity_tx;
DRW_stats_group_start("Motion Blur");
GPU_framebuffer_bind(tiles_flatten_fb_);
DRW_draw_pass(tiles_flatten_ps_);
for (int max_blur = data_.blur_max; max_blur > 0; max_blur -= MB_TILE_DIVISOR) {
GPU_framebuffer_bind(tiles_dilate_fb_);
DRW_draw_pass(tiles_dilate_ps_);
SWAP(GPUTexture *, tiles_tx_, tiles_dilated_tx_);
Framebuffer::swap(tiles_flatten_fb_, tiles_dilate_fb_);
}
/* Swap again so result is in tiles_dilated_tx_. */
SWAP(GPUTexture *, tiles_tx_, tiles_dilated_tx_);
Framebuffer::swap(tiles_flatten_fb_, tiles_dilate_fb_);
gather_fb_.ensure(GPU_ATTACHMENT_NONE, GPU_ATTACHMENT_TEXTURE(*output_tx));
GPU_framebuffer_bind(gather_fb_);
DRW_draw_pass(gather_ps_);
DRW_stats_group_end();
/* Swap buffers so that next effect has the right input. */
*input_tx = *output_tx;
*output_tx = input_color_tx_;
}
/** \} */
} // namespace blender::eevee
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