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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 2021, Blender Foundation.
*/
/** \file
* \ingroup eevee
*
* A film is a fullscreen buffer (usually at output extent)
* that will be able to accumulate sample in any distorted camera_type
* using a pixel filter.
*
* Input needs to be jittered so that the filter converges to the right result.
*/
#pragma once
#include "DRW_render.h"
#include "eevee_camera.hh"
#include "eevee_sampling.hh"
#include "eevee_shader.hh"
#include "eevee_wrapper.hh"
namespace blender::eevee {
class Instance;
/* -------------------------------------------------------------------- */
/** \name Film
* \{ */
class Film {
private:
Instance &inst_;
/** Owned resources. */
eevee::Framebuffer read_result_fb_;
eevee::Framebuffer accumulation_fb_[2];
eevee::Texture data_tx_[2];
eevee::Texture weight_tx_[2];
/** First sample in case we need to blend using it or just reuse it. */
eevee::Texture first_sample_tx_;
/** Reference to first_sample_tx_ or data_tx_ depending on the context. */
GPUTexture *first_sample_ref_;
DRWPass *clear_ps_ = nullptr;
DRWPass *accumulate_ps_ = nullptr;
DRWPass *resolve_ps_ = nullptr;
/** Shader parameter, not allocated. */
GPUTexture *input_tx_;
/** ViewProjection matrix used to render the input. */
float src_persmat_[4][4];
/** ViewProjection matrix Inverse used to render the input. */
float src_persinv_[4][4];
StructBuffer<FilmData> data_;
/** True if offset or size changed. */
bool has_changed_ = true;
/** Debug static name. */
StringRefNull name_;
public:
/* NOTE: name needs to be static. */
Film(Instance &inst, eFilmDataType data_type, const char *name) : inst_(inst), name_(name)
{
data_.extent[0] = data_.extent[1] = -1;
data_.data_type = data_type;
data_.use_history = 0;
}
~Film(){};
void init(const ivec2 &full_extent, const rcti *output_rect);
void sync(void);
void end_sync(void);
void accumulate(GPUTexture *input, const DRWView *view);
void resolve_viewport(GPUFrameBuffer *target);
void read_result(float *data);
private:
bool do_smooth_viewport_smooth_transition(void)
{
return ELEM(data_.data_type, FILM_DATA_COLOR, FILM_DATA_COLOR_LOG) &&
!DRW_state_is_image_render();
}
};
/** \} */
} // namespace blender::eevee
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