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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/settings.h"
#include "video_core/fsr.h"
#include "video_core/host_shaders/ffx_a_h.h"
#include "video_core/host_shaders/ffx_fsr1_h.h"
#include "video_core/host_shaders/full_screen_triangle_vert.h"
#include "video_core/host_shaders/opengl_fidelityfx_fsr_easu_frag.h"
#include "video_core/host_shaders/opengl_fidelityfx_fsr_frag.h"
#include "video_core/host_shaders/opengl_fidelityfx_fsr_rcas_frag.h"
#include "video_core/renderer_opengl/gl_shader_manager.h"
#include "video_core/renderer_opengl/gl_shader_util.h"
#include "video_core/renderer_opengl/present/fsr.h"
#include "video_core/renderer_opengl/present/util.h"
namespace OpenGL {
using namespace FSR;
using FsrConstants = std::array<u32, 4 * 4>;
FSR::FSR(u32 output_width_, u32 output_height_) : width(output_width_), height(output_height_) {
std::string fsr_source{HostShaders::OPENGL_FIDELITYFX_FSR_FRAG};
ReplaceInclude(fsr_source, "ffx_a.h", HostShaders::FFX_A_H);
ReplaceInclude(fsr_source, "ffx_fsr1.h", HostShaders::FFX_FSR1_H);
std::string fsr_easu_source{HostShaders::OPENGL_FIDELITYFX_FSR_EASU_FRAG};
std::string fsr_rcas_source{HostShaders::OPENGL_FIDELITYFX_FSR_RCAS_FRAG};
ReplaceInclude(fsr_easu_source, "opengl_fidelityfx_fsr.frag", fsr_source);
ReplaceInclude(fsr_rcas_source, "opengl_fidelityfx_fsr.frag", fsr_source);
vert = CreateProgram(HostShaders::FULL_SCREEN_TRIANGLE_VERT, GL_VERTEX_SHADER);
easu_frag = CreateProgram(fsr_easu_source, GL_FRAGMENT_SHADER);
rcas_frag = CreateProgram(fsr_rcas_source, GL_FRAGMENT_SHADER);
glProgramUniform2f(vert.handle, 0, 1.0f, -1.0f);
glProgramUniform2f(vert.handle, 1, 0.0f, 1.0f);
sampler = CreateBilinearSampler();
framebuffer.Create();
easu_tex.Create(GL_TEXTURE_2D);
glTextureStorage2D(easu_tex.handle, 1, GL_RGBA16F, width, height);
rcas_tex.Create(GL_TEXTURE_2D);
glTextureStorage2D(rcas_tex.handle, 1, GL_RGBA16F, width, height);
}
FSR::~FSR() = default;
GLuint FSR::Draw(ProgramManager& program_manager, GLuint texture, u32 input_image_width,
u32 input_image_height, const Common::Rectangle<f32>& crop_rect) {
const f32 input_width = static_cast<f32>(input_image_width);
const f32 input_height = static_cast<f32>(input_image_height);
const f32 output_width = static_cast<f32>(width);
const f32 output_height = static_cast<f32>(height);
const f32 viewport_width = (crop_rect.right - crop_rect.left) * input_width;
const f32 viewport_x = crop_rect.left * input_width;
const f32 viewport_height = (crop_rect.bottom - crop_rect.top) * input_height;
const f32 viewport_y = crop_rect.top * input_height;
FsrConstants easu_con{};
FsrConstants rcas_con{};
FsrEasuConOffset(easu_con.data() + 0, easu_con.data() + 4, easu_con.data() + 8,
easu_con.data() + 12, viewport_width, viewport_height, input_width,
input_height, output_width, output_height, viewport_x, viewport_y);
const float sharpening =
static_cast<float>(Settings::values.fsr_sharpening_slider.GetValue()) / 100.0f;
FsrRcasCon(rcas_con.data(), sharpening);
glProgramUniform4uiv(easu_frag.handle, 0, sizeof(easu_con), easu_con.data());
glProgramUniform4uiv(rcas_frag.handle, 0, sizeof(rcas_con), rcas_con.data());
glFrontFace(GL_CW);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, framebuffer.handle);
glNamedFramebufferTexture(framebuffer.handle, GL_COLOR_ATTACHMENT0, easu_tex.handle, 0);
glViewportIndexedf(0, 0.0f, 0.0f, output_width, output_height);
program_manager.BindPresentPrograms(vert.handle, easu_frag.handle);
glBindTextureUnit(0, texture);
glBindSampler(0, sampler.handle);
glDrawArrays(GL_TRIANGLES, 0, 3);
glNamedFramebufferTexture(framebuffer.handle, GL_COLOR_ATTACHMENT0, rcas_tex.handle, 0);
program_manager.BindPresentPrograms(vert.handle, rcas_frag.handle);
glBindTextureUnit(0, easu_tex.handle);
glDrawArrays(GL_TRIANGLES, 0, 3);
return rcas_tex.handle;
}
bool FSR::NeedsRecreation(const Common::Rectangle<u32>& screen) {
return screen.GetWidth() != width || screen.GetHeight() != height;
}
} // namespace OpenGL
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