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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/renderer_opengl/gl_fsr.h"
#include "video_core/renderer_opengl/gl_shader_manager.h"
#include "video_core/renderer_opengl/gl_shader_util.h"
namespace OpenGL {
using namespace FSR;
using FsrConstants = std::array<u32, 4 * 4>;
FSR::FSR(std::string_view fsr_vertex_source, std::string_view fsr_easu_source,
std::string_view fsr_rcas_source)
: fsr_vertex{CreateProgram(fsr_vertex_source, GL_VERTEX_SHADER)},
fsr_easu_frag{CreateProgram(fsr_easu_source, GL_FRAGMENT_SHADER)},
fsr_rcas_frag{CreateProgram(fsr_rcas_source, GL_FRAGMENT_SHADER)} {
glProgramUniform2f(fsr_vertex.handle, 0, 1.0f, 1.0f);
glProgramUniform2f(fsr_vertex.handle, 1, 0.0f, 0.0f);
}
FSR::~FSR() = default;
void FSR::Draw(ProgramManager& program_manager, const Common::Rectangle<u32>& screen,
u32 input_image_width, u32 input_image_height,
const Common::Rectangle<int>& crop_rect) {
const auto output_image_width = screen.GetWidth();
const auto output_image_height = screen.GetHeight();
if (fsr_intermediate_tex.handle) {
GLint fsr_tex_width, fsr_tex_height;
glGetTextureLevelParameteriv(fsr_intermediate_tex.handle, 0, GL_TEXTURE_WIDTH,
&fsr_tex_width);
glGetTextureLevelParameteriv(fsr_intermediate_tex.handle, 0, GL_TEXTURE_HEIGHT,
&fsr_tex_height);
if (static_cast<u32>(fsr_tex_width) != output_image_width ||
static_cast<u32>(fsr_tex_height) != output_image_height) {
fsr_intermediate_tex.Release();
}
}
if (!fsr_intermediate_tex.handle) {
fsr_intermediate_tex.Create(GL_TEXTURE_2D);
glTextureStorage2D(fsr_intermediate_tex.handle, 1, GL_RGB16F, output_image_width,
output_image_height);
glNamedFramebufferTexture(fsr_framebuffer.handle, GL_COLOR_ATTACHMENT0,
fsr_intermediate_tex.handle, 0);
}
GLint old_draw_fb;
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, &old_draw_fb);
glFrontFace(GL_CW);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fsr_framebuffer.handle);
glViewportIndexedf(0, 0.0f, 0.0f, static_cast<GLfloat>(output_image_width),
static_cast<GLfloat>(output_image_height));
FsrConstants constants;
FsrEasuConOffset(
constants.data() + 0, constants.data() + 4, constants.data() + 8, constants.data() + 12,
static_cast<f32>(crop_rect.GetWidth()), static_cast<f32>(crop_rect.GetHeight()),
static_cast<f32>(input_image_width), static_cast<f32>(input_image_height),
static_cast<f32>(output_image_width), static_cast<f32>(output_image_height),
static_cast<f32>(crop_rect.left), static_cast<f32>(crop_rect.top));
glProgramUniform4uiv(fsr_easu_frag.handle, 0, sizeof(constants), std::data(constants));
program_manager.BindPresentPrograms(fsr_vertex.handle, fsr_easu_frag.handle);
glDrawArrays(GL_TRIANGLES, 0, 3);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, old_draw_fb);
glBindTextureUnit(0, fsr_intermediate_tex.handle);
const float sharpening =
static_cast<float>(Settings::values.fsr_sharpening_slider.GetValue()) / 100.0f;
FsrRcasCon(constants.data(), sharpening);
glProgramUniform4uiv(fsr_rcas_frag.handle, 0, sizeof(constants), std::data(constants));
}
void FSR::InitBuffers() {
fsr_framebuffer.Create();
}
void FSR::ReleaseBuffers() {
fsr_framebuffer.Release();
fsr_intermediate_tex.Release();
}
const OGLProgram& FSR::GetPresentFragmentProgram() const noexcept {
return fsr_rcas_frag;
}
bool FSR::AreBuffersInitialized() const noexcept {
return fsr_framebuffer.handle;
}
} // namespace OpenGL
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