💿🐜 Antkeeper source code
https://antkeeper.com
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307 lines
8.3 KiB
307 lines
8.3 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 <engine/render/passes/bloom-pass.hpp>
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#include <engine/resources/resource-manager.hpp>
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#include <engine/gl/pipeline.hpp>
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#include <engine/gl/framebuffer.hpp>
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#include <engine/gl/shader-program.hpp>
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#include <engine/gl/shader-variable.hpp>
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#include <engine/gl/vertex-buffer.hpp>
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#include <engine/gl/vertex-array.hpp>
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#include <engine/gl/texture.hpp>
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#include <engine/render/vertex-attribute-location.hpp>
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#include <engine/render/context.hpp>
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#include <algorithm>
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#include <cmath>
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namespace render {
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bloom_pass::bloom_pass(gl::pipeline* pipeline, resource_manager* resource_manager):
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pass(pipeline, nullptr)
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{
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// Load downsample shader template
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auto downsample_shader_template = resource_manager->load<gl::shader_template>("bloom-downsample.glsl");
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// Build downsample shader program with Karis averaging
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m_downsample_karis_shader = downsample_shader_template->build
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(
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{
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{"KARIS_AVERAGE", std::string()}
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}
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);
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// Build downsample shader program without Karis averaging
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m_downsample_shader = downsample_shader_template->build();
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// Load upsample shader template
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auto upsample_shader_template = resource_manager->load<gl::shader_template>("bloom-upsample.glsl");
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// Build upsample shader program
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m_upsample_shader = upsample_shader_template->build();
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// Construct framebuffer texture sampler
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m_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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// Allocate empty vertex array
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m_vertex_array = std::make_unique<gl::vertex_array>();
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}
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void bloom_pass::render(render::context& ctx)
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{
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// Execute command buffer
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for (const auto& command: m_command_buffer)
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{
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command();
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}
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}
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void bloom_pass::set_source_texture(std::shared_ptr<gl::texture_2d> texture)
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{
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if (m_source_texture != texture)
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{
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m_source_texture = texture;
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rebuild_mip_chain();
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correct_filter_radius();
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rebuild_command_buffer();
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}
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}
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void bloom_pass::set_mip_chain_length(unsigned int length)
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{
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m_mip_chain_length = length;
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rebuild_mip_chain();
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rebuild_command_buffer();
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}
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void bloom_pass::set_filter_radius(float radius)
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{
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m_filter_radius = radius;
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correct_filter_radius();
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}
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void bloom_pass::rebuild_mip_chain()
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{
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if (m_source_texture && m_mip_chain_length)
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{
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// Rebuild target image
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m_target_image = std::make_shared<gl::image_2d>
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(
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gl::format::r16g16b16_sfloat,
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m_source_texture->get_image_view()->get_image()->get_dimensions()[0],
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m_source_texture->get_image_view()->get_image()->get_dimensions()[1],
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m_mip_chain_length
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);
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m_target_textures.resize(m_mip_chain_length);
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m_target_framebuffers.resize(m_mip_chain_length);
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for (unsigned int i = 0; i < m_mip_chain_length; ++i)
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{
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// Rebuild mip texture
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m_target_textures[i] = 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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m_target_image,
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m_target_image->get_format(),
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i,
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1
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),
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m_sampler
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);
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// Rebuild mip framebuffer
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const gl::framebuffer_attachment attachments[1] =
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{{
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gl::color_attachment_bit,
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m_target_textures[i]->get_image_view(),
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0
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}};
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m_target_framebuffers[i] = std::make_shared<gl::framebuffer>
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(
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attachments,
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m_target_image->get_dimensions()[0] >> i,
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m_target_image->get_dimensions()[1] >> i
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);
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}
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}
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else
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{
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m_target_image = nullptr;
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m_target_textures.clear();
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m_target_framebuffers.clear();
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}
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}
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void bloom_pass::correct_filter_radius()
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{
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// Get aspect ratio of target image
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float aspect_ratio = 1.0f;
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if (m_target_image)
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{
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aspect_ratio = static_cast<float>(m_target_image->get_dimensions()[1]) /
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static_cast<float>(m_target_image->get_dimensions()[0]);
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}
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// Correct filter radius according to target image aspect ratio
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m_corrected_filter_radius = {m_filter_radius * aspect_ratio, m_filter_radius};
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}
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void bloom_pass::rebuild_command_buffer()
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{
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m_command_buffer.clear();
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if (!m_source_texture ||
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!m_mip_chain_length ||
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!m_downsample_karis_shader ||
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!m_downsample_shader ||
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!m_upsample_shader)
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{
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return;
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}
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// Setup downsample state
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m_command_buffer.emplace_back
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(
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[&]()
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{
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m_pipeline->set_primitive_topology(gl::primitive_topology::triangle_list);
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m_pipeline->bind_vertex_array(m_vertex_array.get());
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m_pipeline->set_depth_test_enabled(false);
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m_pipeline->set_cull_mode(gl::cull_mode::back);
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m_pipeline->set_color_blend_enabled(false);
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}
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);
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// Downsample first mip with Karis average
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if (auto source_texture_var = m_downsample_karis_shader->variable("source_texture"))
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{
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m_command_buffer.emplace_back
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(
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[&, source_texture_var]()
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{
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m_pipeline->bind_shader_program(m_downsample_karis_shader.get());
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m_pipeline->bind_framebuffer(m_target_framebuffers[0].get());
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const auto& target_dimensions = m_target_image->get_dimensions();
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const gl::viewport viewport[1] = {{0.0f, 0.0f, static_cast<float>(target_dimensions[0]), static_cast<float>(target_dimensions[1])}};
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m_pipeline->set_viewport(0, viewport);
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source_texture_var->update(*m_source_texture);
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// Draw fullscreen triangle
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m_pipeline->draw(3, 1, 0, 0);
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}
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);
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}
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// Downsample remaining mips
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if (m_mip_chain_length > 1)
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{
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if (auto source_texture_var = m_downsample_shader->variable("source_texture"))
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{
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m_command_buffer.emplace_back([&](){m_pipeline->bind_shader_program(m_downsample_shader.get());});
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for (int i = 1; i < static_cast<int>(m_mip_chain_length); ++i)
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{
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m_command_buffer.emplace_back
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(
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[&, source_texture_var, i]()
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{
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m_pipeline->bind_framebuffer(m_target_framebuffers[i].get());
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const auto& target_dimensions = m_target_image->get_dimensions();
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const gl::viewport viewport[1] = {{0.0f, 0.0f, static_cast<float>(target_dimensions[0] >> i), static_cast<float>(target_dimensions[1] >> i)}};
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m_pipeline->set_viewport(0, viewport);
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// Use previous downsample texture as downsample source
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source_texture_var->update(*m_target_textures[i - 1]);
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// Draw fullscreen triangle
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m_pipeline->draw(3, 1, 0, 0);
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}
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);
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}
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}
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}
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// Setup upsample state
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m_command_buffer.emplace_back
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(
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[&]()
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{
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// Enable additive blending
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m_pipeline->set_color_blend_enabled(true);
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m_pipeline->set_color_blend_equation
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({
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gl::blend_factor::one,
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gl::blend_factor::one,
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gl::blend_op::add,
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gl::blend_factor::one,
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gl::blend_factor::one,
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gl::blend_op::add
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});
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// Bind upsample shader
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m_pipeline->bind_shader_program(m_upsample_shader.get());
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}
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);
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// Update upsample filter radius
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if (auto filter_radius_var = m_upsample_shader->variable("filter_radius"))
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{
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m_command_buffer.emplace_back([&, filter_radius_var](){filter_radius_var->update(m_corrected_filter_radius);});
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}
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// Upsample
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if (auto source_texture_var = m_upsample_shader->variable("source_texture"))
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{
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for (int i = static_cast<int>(m_mip_chain_length) - 1; i > 0; --i)
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{
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const int j = i - 1;
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m_command_buffer.emplace_back
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(
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[&, source_texture_var, i, j]()
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{
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m_pipeline->bind_framebuffer(m_target_framebuffers[j].get());
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const auto& target_dimensions = m_target_image->get_dimensions();
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const gl::viewport viewport[1] = {{0.0f, 0.0f, static_cast<float>(target_dimensions[0] >> j), static_cast<float>(target_dimensions[1] >> j)}};
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m_pipeline->set_viewport(0, viewport);
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source_texture_var->update(*m_target_textures[i]);
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// Draw fullscreen triangle
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m_pipeline->draw(3, 1, 0, 0);
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}
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);
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}
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}
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}
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} // namespace render
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