💿🐜 Antkeeper source code
https://antkeeper.com
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360 lines
9.8 KiB
360 lines
9.8 KiB
/*
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* Copyright (C) 2023 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "game/graphics.hpp"
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#include <engine/config.hpp>
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#include <engine/debug/log.hpp>
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#include <engine/gl/framebuffer.hpp>
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#include <engine/gl/texture.hpp>
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#include <engine/render/passes/bloom-pass.hpp>
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#include <engine/render/passes/final-pass.hpp>
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#include <engine/render/passes/resample-pass.hpp>
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#include <engine/render/passes/sky-pass.hpp>
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#include <engine/render/passes/material-pass.hpp>
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#include <chrono>
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#include <filesystem>
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#include <format>
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#include <glad/gl.h>
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#include <stb/stb_image_write.h>
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#include <thread>
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namespace graphics {
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static void reroute_framebuffers(::game& ctx);
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static void rebuild_hdr_framebuffer(::game& ctx)
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{
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// Construct HDR framebuffer sampler
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auto hdr_sampler = std::make_shared<gl::sampler>
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(
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gl::sampler_filter::linear,
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gl::sampler_filter::linear,
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gl::sampler_mipmap_mode::linear,
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gl::sampler_address_mode::clamp_to_edge,
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gl::sampler_address_mode::clamp_to_edge
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);
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// Construct HDR framebuffer color texture
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ctx.hdr_color_texture = std::make_shared<gl::texture_2d>
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(
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std::make_shared<gl::image_view_2d>
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(
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std::make_shared<gl::image_2d>
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(
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gl::format::r32g32b32_sfloat,
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ctx.render_resolution.x(),
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ctx.render_resolution.y()
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)
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),
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hdr_sampler
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);
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// Construct HDR framebuffer depth texture
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ctx.hdr_depth_texture = std::make_shared<gl::texture_2d>
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(
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std::make_shared<gl::image_view_2d>
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(
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std::make_shared<gl::image_2d>
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(
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gl::format::d32_sfloat_s8_uint,
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ctx.render_resolution.x(),
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ctx.render_resolution.y()
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)
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),
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hdr_sampler
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);
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// Construct HDR framebuffer
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const gl::framebuffer_attachment hdr_attachments[2] =
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{
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{
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gl::color_attachment_bit,
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ctx.hdr_color_texture->get_image_view(),
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0
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},
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{
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gl::depth_stencil_attachment_bits,
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ctx.hdr_depth_texture->get_image_view(),
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0
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}
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};
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ctx.hdr_framebuffer = std::make_shared<gl::framebuffer>(hdr_attachments, ctx.render_resolution.x(), ctx.render_resolution.y());
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}
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static void rebuild_ldr_framebuffers(::game& ctx)
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{
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auto ldr_sampler = std::make_shared<gl::sampler>
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(
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gl::sampler_filter::linear,
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gl::sampler_filter::linear,
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gl::sampler_mipmap_mode::linear,
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gl::sampler_address_mode::clamp_to_edge,
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gl::sampler_address_mode::clamp_to_edge
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);
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// Construct LDR framebuffer A color texture
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ctx.ldr_color_texture_a = std::make_shared<gl::texture_2d>
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(
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std::make_shared<gl::image_view_2d>
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(
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std::make_shared<gl::image_2d>
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(
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gl::format::r8g8b8_unorm,
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ctx.render_resolution.x(),
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ctx.render_resolution.y()
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)
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),
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ldr_sampler
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);
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// Construct LDR framebuffer A
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const gl::framebuffer_attachment ldr_attachments_a[1] =
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{
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{
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gl::color_attachment_bit,
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ctx.ldr_color_texture_a->get_image_view(),
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0
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}
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};
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ctx.ldr_framebuffer_a = std::make_shared<gl::framebuffer>(ldr_attachments_a, ctx.render_resolution.x(), ctx.render_resolution.y());
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// Construct LDR framebuffer B color texture
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ctx.ldr_color_texture_b = std::make_shared<gl::texture_2d>
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(
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std::make_shared<gl::image_view_2d>
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(
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std::make_shared<gl::image_2d>
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(
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gl::format::r8g8b8_unorm,
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ctx.render_resolution.x(),
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ctx.render_resolution.y()
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)
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),
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ldr_sampler
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);
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// Construct LDR framebuffer B
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const gl::framebuffer_attachment ldr_attachments_b[1] =
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{
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{
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gl::color_attachment_bit,
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ctx.ldr_color_texture_b->get_image_view(),
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0
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}
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};
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ctx.ldr_framebuffer_b = std::make_shared<gl::framebuffer>(ldr_attachments_b, ctx.render_resolution.x(), ctx.render_resolution.y());
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}
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void rebuild_shadow_framebuffer(::game& ctx)
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{
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// Construct shadow map sampler
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auto shadow_sampler = std::make_shared<gl::sampler>
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(
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gl::sampler_filter::linear,
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gl::sampler_filter::linear,
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gl::sampler_mipmap_mode::linear,
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gl::sampler_address_mode::clamp_to_border,
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gl::sampler_address_mode::clamp_to_border,
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gl::sampler_address_mode::clamp_to_border,
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0.0f,
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0.0f,
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true,
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gl::compare_op::greater,
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-1000.0f,
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1000.0f,
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std::array<float, 4>{0.0f, 0.0f, 0.0f, 0.0f}
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);
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// Construct shadow map framebuffer depth texture
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ctx.shadow_map_depth_texture = std::make_shared<gl::texture_2d>
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(
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std::make_shared<gl::image_view_2d>
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(
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std::make_shared<gl::image_2d>
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(
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gl::format::d32_sfloat,
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ctx.shadow_map_resolution,
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ctx.shadow_map_resolution
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)
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),
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shadow_sampler
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);
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// Construct shadow map framebuffer
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const gl::framebuffer_attachment shadow_map_attachments[1] =
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{
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{
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gl::depth_attachment_bit,
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ctx.shadow_map_depth_texture->get_image_view(),
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0
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}
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};
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ctx.shadow_map_framebuffer = std::make_shared<gl::framebuffer>(shadow_map_attachments, ctx.shadow_map_resolution, ctx.shadow_map_resolution);
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}
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void create_framebuffers(::game& ctx)
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{
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debug::log_trace("Creating framebuffers...");
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// Calculate render resolution
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const math::ivec2& viewport_size = ctx.window->get_viewport_size();
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ctx.render_resolution = {static_cast<int>(viewport_size.x() * ctx.render_scale + 0.5f), static_cast<int>(viewport_size.y() * ctx.render_scale + 0.5f)};
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rebuild_hdr_framebuffer(ctx);
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rebuild_ldr_framebuffers(ctx);
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rebuild_shadow_framebuffer(ctx);
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debug::log_trace("Created framebuffers");
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}
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void destroy_framebuffers(::game& ctx)
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{
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debug::log_trace("Destroying framebuffers...");
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// Delete HDR framebuffer and its attachments
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ctx.hdr_framebuffer.reset();
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ctx.hdr_color_texture.reset();
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ctx.hdr_depth_texture.reset();
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// Delete LDR framebuffers and attachments
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ctx.ldr_framebuffer_a.reset();
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ctx.ldr_color_texture_a.reset();
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ctx.ldr_framebuffer_b.reset();
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ctx.ldr_color_texture_b.reset();
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// Delete shadow map framebuffer and its attachments
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ctx.shadow_map_framebuffer.reset();
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ctx.shadow_map_depth_texture.reset();
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debug::log_trace("Destroyed framebuffers");
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}
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void change_render_resolution(::game& ctx, float scale)
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{
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// Recalculate render resolution
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const math::ivec2& viewport_size = ctx.window->get_viewport_size();
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const auto render_resolution = math::ivec2{static_cast<int>(viewport_size.x() * scale + 0.5f), static_cast<int>(viewport_size.y() * scale + 0.5f)};
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if (ctx.render_resolution == render_resolution)
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{
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return;
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}
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debug::log_trace("Changing render resolution to {}...", scale);
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// Update render resolution scale
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ctx.render_scale = scale;
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ctx.render_resolution = render_resolution;
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rebuild_hdr_framebuffer(ctx);
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rebuild_ldr_framebuffers(ctx);
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// Enable or disable resample pass
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if (viewport_size.x() != ctx.render_resolution.x() || viewport_size.y() != ctx.render_resolution.y())
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{
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ctx.resample_pass->set_enabled(true);
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debug::log_debug("Resample pass enabled");
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}
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else
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{
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ctx.resample_pass->set_enabled(false);
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debug::log_debug("Resample pass disabled");
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}
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reroute_framebuffers(ctx);
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debug::log_trace("Changed render resolution to {}", scale);
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}
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void save_screenshot(::game& ctx)
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{
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// Determine timestamped screenshot filename
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const auto time = std::chrono::floor<std::chrono::milliseconds>(std::chrono::system_clock::now());
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const std::string screenshot_filename = std::format("{0}-{1:%Y%m%d}T{1:%H%M%S}Z.png", config::application_name, time);
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// Determine path to screenshot file
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std::filesystem::path screenshot_filepath = ctx.screenshots_path / screenshot_filename;
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std::string screenshot_filepath_string = screenshot_filepath.string();
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debug::log_debug("Saving screenshot to \"{}\"...", screenshot_filepath_string);
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// Get viewport dimensions
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const auto& viewport_size = ctx.window->get_viewport_size();
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// Allocate screenshot pixel data buffer
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std::unique_ptr<std::byte[]> frame = std::make_unique<std::byte[]>(viewport_size.x() * viewport_size.y() * 3);
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// Read pixel data from backbuffer into pixel data buffer
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glReadBuffer(GL_BACK);
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glReadPixels(0, 0, viewport_size.x(), viewport_size.y(), GL_RGB, GL_UNSIGNED_BYTE, frame.get());
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// Write screenshot file in separate thread
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std::thread
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(
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[frame = std::move(frame), w = viewport_size.x(), h = viewport_size.y(), path = std::move(screenshot_filepath_string)]
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{
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stbi_flip_vertically_on_write(1);
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stbi_write_png(path.c_str(), w, h, 3, frame.get(), w * 3);
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debug::log_debug("Saved screenshot to \"{}\"", path);
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}
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).detach();
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}
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void select_anti_aliasing_method(::game& ctx, render::anti_aliasing_method method)
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{
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// Switch AA method
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switch (method)
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{
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// Off
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case render::anti_aliasing_method::none:
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debug::log_debug("Anti-aliasing disabled");
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reroute_framebuffers(ctx);
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break;
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// FXAA
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case render::anti_aliasing_method::fxaa:
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debug::log_debug("Anti-aliasing enabled (FXAA)");
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reroute_framebuffers(ctx);
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break;
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}
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// Update AA method setting
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ctx.anti_aliasing_method = method;
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}
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void reroute_framebuffers(::game& ctx)
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{
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if (ctx.resample_pass->is_enabled())
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{
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ctx.common_final_pass->set_framebuffer(ctx.ldr_framebuffer_a.get());
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}
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else
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{
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ctx.common_final_pass->set_framebuffer(nullptr);
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}
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ctx.sky_pass->set_framebuffer(ctx.hdr_framebuffer.get());
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ctx.surface_material_pass->set_framebuffer(ctx.hdr_framebuffer.get());
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ctx.bloom_pass->set_source_texture(ctx.hdr_color_texture);
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ctx.common_final_pass->set_color_texture(ctx.hdr_color_texture);
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ctx.common_final_pass->set_bloom_texture(ctx.bloom_pass->get_bloom_texture());
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}
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} // namespace graphics
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