💿🐜 Antkeeper source code
https://antkeeper.com
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779 lines
27 KiB
779 lines
27 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/sky-pass.hpp>
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#include <engine/resources/resource-manager.hpp>
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#include <engine/gl/rasterizer.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/vertex-attribute.hpp>
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#include <engine/gl/drawing-mode.hpp>
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#include <engine/gl/texture-2d.hpp>
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#include <engine/gl/texture-wrapping.hpp>
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#include <engine/gl/texture-filter.hpp>
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#include <engine/render/vertex-attribute.hpp>
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#include <engine/render/context.hpp>
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#include <engine/render/model.hpp>
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#include <engine/render/material.hpp>
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#include <engine/scene/camera.hpp>
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#include <engine/utility/fundamental-types.hpp>
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#include <engine/color/color.hpp>
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#include <engine/math/interpolation.hpp>
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#include <engine/geom/cartesian.hpp>
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#include <engine/geom/spherical.hpp>
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#include <engine/physics/orbit/orbit.hpp>
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#include <engine/physics/light/photometry.hpp>
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#include <cmath>
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#include <stdexcept>
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#include <glad/glad.h>
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namespace render {
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sky_pass::sky_pass(gl::rasterizer* rasterizer, const gl::framebuffer* framebuffer, resource_manager* resource_manager):
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pass(rasterizer, framebuffer),
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mouse_position({0.0f, 0.0f}),
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sky_model(nullptr),
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sky_material(nullptr),
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sky_model_vao(nullptr),
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sky_lut_shader_program(nullptr),
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moon_model(nullptr),
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moon_model_vao(nullptr),
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moon_material(nullptr),
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moon_shader_program(nullptr),
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stars_model(nullptr),
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stars_model_vao(nullptr),
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star_material(nullptr),
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star_shader_program(nullptr),
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observer_position_tween({0, 0, 0}, math::lerp<float3, float>),
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sun_position_tween(float3{1.0f, 0.0f, 0.0f}, math::lerp<float3, float>),
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sun_luminance_tween(float3{0.0f, 0.0f, 0.0f}, math::lerp<float3, float>),
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sun_illuminance_tween(float3{0.0f, 0.0f, 0.0f}, math::lerp<float3, float>),
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icrf_to_eus_translation({0, 0, 0}, math::lerp<float3, float>),
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icrf_to_eus_rotation(math::quaternion<float>::identity(), math::nlerp<float>),
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moon_position_tween(float3{0, 0, 0}, math::lerp<float3, float>),
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moon_rotation_tween(math::quaternion<float>::identity(), math::nlerp<float>),
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moon_angular_radius_tween(0.0f, math::lerp<float, float>),
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moon_sunlight_direction_tween(float3{0, 0, 0}, math::lerp<float3, float>),
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moon_sunlight_illuminance_tween(float3{0, 0, 0}, math::lerp<float3, float>),
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moon_planetlight_direction_tween(float3{0, 0, 0}, math::lerp<float3, float>),
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moon_planetlight_illuminance_tween(float3{0, 0, 0}, math::lerp<float3, float>),
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moon_illuminance_tween(float3{0.0f, 0.0f, 0.0f}, math::lerp<float3, float>),
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render_transmittance_lut(false),
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magnification(1.0f)
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{
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// Build quad VBO and VAO
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const float2 vertex_positions[] =
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{
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{-1.0f, 1.0f},
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{-1.0f, -1.0f},
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{ 1.0f, 1.0f},
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{ 1.0f, 1.0f},
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{-1.0f, -1.0f},
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{ 1.0f, -1.0f}
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};
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const auto vertex_data = std::as_bytes(std::span{vertex_positions});
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std::size_t vertex_size = 2;
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std::size_t vertex_stride = sizeof(float) * vertex_size;
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quad_vbo = std::make_unique<gl::vertex_buffer>(gl::buffer_usage::static_draw, vertex_data.size(), vertex_data);
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quad_vao = std::make_unique<gl::vertex_array>();
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// Define position vertex attribute
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gl::vertex_attribute position_attribute;
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position_attribute.buffer = quad_vbo.get();
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position_attribute.offset = 0;
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position_attribute.stride = vertex_stride;
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position_attribute.type = gl::vertex_attribute_type::float_32;
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position_attribute.components = 2;
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// Bind vertex attributes to VAO
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quad_vao->bind(render::vertex_attribute::position, position_attribute);
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// Create transmittance LUT texture and framebuffer (32F color, no depth)
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transmittance_lut_texture = std::make_unique<gl::texture_2d>(256, 64, gl::pixel_type::float_32, gl::pixel_format::rgb);
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transmittance_lut_texture->set_wrapping(gl::texture_wrapping::extend, gl::texture_wrapping::extend);
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transmittance_lut_texture->set_filters(gl::texture_min_filter::linear, gl::texture_mag_filter::linear);
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transmittance_lut_texture->set_max_anisotropy(0.0f);
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transmittance_lut_framebuffer = std::make_unique<gl::framebuffer>(transmittance_lut_texture->get_width(), transmittance_lut_texture->get_height());
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transmittance_lut_framebuffer->attach(gl::framebuffer_attachment_type::color, transmittance_lut_texture.get());
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transmittance_lut_resolution = {static_cast<float>(transmittance_lut_texture->get_width()), static_cast<float>(transmittance_lut_texture->get_height())};
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// Load transmittance LUT shader template
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transmittance_lut_shader_template = resource_manager->load<gl::shader_template>("transmittance-lut.glsl");
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// Build transmittance LUT shader program
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transmittance_lut_shader_program = transmittance_lut_shader_template->build
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(
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{
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{"TRANSMITTANCE_LUT_SAMPLES", std::to_string(40)}
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}
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);
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if (!transmittance_lut_shader_program->linked())
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{
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debug::log::error("Failed to build transmittance LUT shader program: {}", transmittance_lut_shader_program->info());
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debug::log::warning("{}", transmittance_lut_shader_template->configure(gl::shader_stage::vertex));
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}
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// Build transmittance LUT command buffer
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rebuild_transmittance_lut_command_buffer();
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// Create sky LUT texture and framebuffer (32F color, no depth)
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int sky_lut_width = 200;
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int sky_lut_height = 100;
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sky_lut_resolution = {static_cast<float>(sky_lut_width), static_cast<float>(sky_lut_height)};
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sky_lut_texture = std::make_unique<gl::texture_2d>(sky_lut_width, sky_lut_height, gl::pixel_type::float_32, gl::pixel_format::rgb);
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sky_lut_texture->set_wrapping(gl::texture_wrapping::extend, gl::texture_wrapping::extend);
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sky_lut_texture->set_filters(gl::texture_min_filter::linear, gl::texture_mag_filter::linear);
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sky_lut_texture->set_max_anisotropy(0.0f);
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sky_lut_framebuffer = std::make_unique<gl::framebuffer>(sky_lut_width, sky_lut_height);
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sky_lut_framebuffer->attach(gl::framebuffer_attachment_type::color, sky_lut_texture.get());
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// Load sky LUT shader template
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sky_lut_shader_template = resource_manager->load<gl::shader_template>("sky-illuminance-lut.glsl");
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// Build sky LUT shader program
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sky_lut_shader_program = sky_lut_shader_template->build
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(
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{
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{"SKY_ILLUMINANCE_SAMPLES", std::to_string(30)}
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}
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);
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if (!sky_lut_shader_program->linked())
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{
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debug::log::error("Failed to by sky LUT shader program: {}", sky_lut_shader_program->info());
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debug::log::warning("{}", sky_lut_shader_template->configure(gl::shader_stage::vertex));
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}
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// Build sky LUT command buffer
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rebuild_sky_lut_command_buffer();
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}
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void sky_pass::render(const render::context& ctx, render::queue& queue)
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{
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glDisable(GL_BLEND);
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glDisable(GL_DEPTH_TEST);
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glDepthMask(GL_FALSE);
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glEnable(GL_CULL_FACE);
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glCullFace(GL_BACK);
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// Render transmittance LUT if transmittance parameters have been altered.
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if (render_transmittance_lut)
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{
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// Render transmittance LUT
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for (const auto& command: transmittance_lut_command_buffer)
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{
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command();
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}
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// Don't render transmittance LUT next frame unless parameters have changed.
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render_transmittance_lut = false;
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}
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// Construct matrices
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const scene::camera& camera = *ctx.camera;
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float clip_near = camera.get_clip_near_tween().interpolate(ctx.alpha);
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float clip_far = camera.get_clip_far_tween().interpolate(ctx.alpha);
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float3 model_scale = float3{1.0f, 1.0f, 1.0f} * (clip_near + clip_far) * 0.5f;
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float4x4 model = math::scale(math::matrix4<float>::identity(), model_scale);
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float4x4 view = float4x4(float3x3(ctx.view));
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float4x4 model_view = view * model;
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const float4x4& projection = ctx.projection;
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float4x4 view_projection = projection * view;
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float4x4 model_view_projection = projection * model_view;
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// Interpolate observer position
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observer_position = observer_position_tween.interpolate(ctx.alpha);
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// Construct tweened ICRF to EUS transformation
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math::transformation::se3<float> icrf_to_eus =
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{
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icrf_to_eus_translation.interpolate(ctx.alpha),
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icrf_to_eus_rotation.interpolate(ctx.alpha)
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};
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// Get EUS direction to sun
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float3 sun_position = sun_position_tween.interpolate(ctx.alpha);
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float3 sun_direction = math::normalize(sun_position);
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// Interpolate and expose sun luminance and illuminance
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float3 sun_illuminance = sun_illuminance_tween.interpolate(ctx.alpha) * ctx.exposure;
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float3 sun_luminance = sun_luminance_tween.interpolate(ctx.alpha) * ctx.exposure;
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float3 moon_position = moon_position_tween.interpolate(ctx.alpha);
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float3 moon_direction = math::normalize(moon_position);
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float3 moon_illuminance = moon_illuminance_tween.interpolate(ctx.alpha) * ctx.exposure;
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float moon_angular_radius = moon_angular_radius_tween.interpolate(ctx.alpha) * magnification;
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float sun_y = color::aces::ap1<float>.luminance(sun_transmitted_illuminance);
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float moon_y = color::aces::ap1<float>.luminance(moon_transmitted_illuminance);
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dominant_light_direction = (sun_y > moon_y) ? sun_direction : moon_direction;
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dominant_light_illuminance = (sun_y > moon_y) ? sun_illuminance : moon_illuminance;
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if (moon_y > sun_y)
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{
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sun_luminance *= 0.0f;
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}
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camera_exposure = ctx.exposure;
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// Render sky illuminance LUT
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for (const auto& command: sky_lut_command_buffer)
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{
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command();
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}
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rasterizer->use_framebuffer(*framebuffer);
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auto viewport = framebuffer->get_dimensions();
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rasterizer->set_viewport(0, 0, std::get<0>(viewport), std::get<1>(viewport));
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float2 resolution = {static_cast<float>(std::get<0>(viewport)), static_cast<float>(std::get<1>(viewport))};
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// Draw atmosphere
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if (sky_model && sky_shader_program)
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{
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rasterizer->use_program(*sky_shader_program);
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// Upload shader parameters
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if (model_view_projection_var)
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model_view_projection_var->update(model_view_projection);
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if (mouse_var)
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mouse_var->update(mouse_position);
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if (resolution_var)
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resolution_var->update(resolution);
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if (light_direction_var)
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light_direction_var->update(dominant_light_direction);
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if (sun_luminance_var)
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sun_luminance_var->update(sun_luminance);
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if (sun_angular_radius_var)
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sun_angular_radius_var->update(sun_angular_radius * magnification);
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if (atmosphere_radii_var)
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atmosphere_radii_var->update(atmosphere_radii);
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if (observer_position_var)
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observer_position_var->update(observer_position);
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if (sky_illuminance_lut_var)
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sky_illuminance_lut_var->update(*sky_lut_texture);
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if (sky_illuminance_lut_resolution_var)
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sky_illuminance_lut_resolution_var->update(sky_lut_resolution);
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//sky_material->update(ctx.alpha);
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rasterizer->draw_arrays(*sky_model_vao, sky_model_drawing_mode, sky_model_start_index, sky_model_index_count);
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}
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE);
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//glBlendFunc(GL_ONE, GL_ONE);
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// Draw stars
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if (star_shader_program)
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{
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float star_distance = (clip_near + clip_far) * 0.5f;
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model = float4x4(float3x3(icrf_to_eus.r));
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model = math::scale(model, {star_distance, star_distance, star_distance});
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model_view = view * model;
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rasterizer->use_program(*star_shader_program);
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if (star_model_view_var)
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star_model_view_var->update(model_view);
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if (star_projection_var)
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star_projection_var->update(projection);
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if (star_distance_var)
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star_distance_var->update(star_distance);
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if (star_exposure_var)
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star_exposure_var->update(ctx.exposure);
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//star_material->update(ctx.alpha);
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rasterizer->draw_arrays(*stars_model_vao, stars_model_drawing_mode, stars_model_start_index, stars_model_index_count);
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}
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// Draw moon model
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//if (moon_position.y() >= -moon_angular_radius)
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if (moon_shader_program)
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{
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float moon_distance = (clip_near + clip_far) * 0.5f;
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float moon_radius = moon_angular_radius * moon_distance;
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math::transform<float> moon_transform;
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moon_transform.translation = math::normalize(moon_position) * moon_distance;
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moon_transform.rotation = moon_rotation_tween.interpolate(ctx.alpha);
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moon_transform.scale = {moon_radius, moon_radius, moon_radius};
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model = math::matrix_cast(moon_transform);
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float3x3 normal_model = math::transpose(math::inverse(float3x3(model)));
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rasterizer->use_program(*moon_shader_program);
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if (moon_model_var)
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moon_model_var->update(model);
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if (moon_view_projection_var)
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moon_view_projection_var->update(view_projection);
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if (moon_normal_model_var)
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moon_normal_model_var->update(normal_model);
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if (moon_camera_position_var)
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moon_camera_position_var->update(ctx.camera_transform.translation);
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if (moon_sunlight_direction_var)
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moon_sunlight_direction_var->update(math::normalize(moon_sunlight_direction_tween.interpolate(ctx.alpha)));
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if (moon_sunlight_illuminance_var)
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moon_sunlight_illuminance_var->update(moon_sunlight_illuminance_tween.interpolate(ctx.alpha) * ctx.exposure);
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if (moon_planetlight_direction_var)
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moon_planetlight_direction_var->update(math::normalize(moon_planetlight_direction_tween.interpolate(ctx.alpha)));
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if (moon_planetlight_illuminance_var)
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moon_planetlight_illuminance_var->update(moon_planetlight_illuminance_tween.interpolate(ctx.alpha) * ctx.exposure);
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//moon_material->update(ctx.alpha);
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rasterizer->draw_arrays(*moon_model_vao, moon_model_drawing_mode, moon_model_start_index, moon_model_index_count);
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}
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}
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void sky_pass::set_sky_model(std::shared_ptr<render::model> model)
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{
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sky_model = model;
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sky_shader_program = nullptr;
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if (sky_model)
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{
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sky_model_vao = model->get_vertex_array().get();
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for (const auto& group: model->get_groups())
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{
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sky_material = group.material.get();
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sky_model_drawing_mode = group.drawing_mode;
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sky_model_start_index = group.start_index;
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sky_model_index_count = group.index_count;
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}
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if (sky_material)
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{
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sky_shader_program = sky_material->get_shader_template()->build();
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if (sky_shader_program)
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{
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model_view_projection_var = sky_shader_program->variable("model_view_projection");
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mouse_var = sky_shader_program->variable("mouse");
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resolution_var = sky_shader_program->variable("resolution");
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light_direction_var = sky_shader_program->variable("light_direction");
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sun_luminance_var = sky_shader_program->variable("sun_luminance");
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sun_angular_radius_var = sky_shader_program->variable("sun_angular_radius");
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atmosphere_radii_var = sky_shader_program->variable("atmosphere_radii");
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observer_position_var = sky_shader_program->variable("observer_position");
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sky_illuminance_lut_var = sky_shader_program->variable("sky_illuminance_lut");
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sky_illuminance_lut_resolution_var = sky_shader_program->variable("sky_illuminance_lut_resolution");
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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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sky_model_vao = nullptr;
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}
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}
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void sky_pass::set_moon_model(std::shared_ptr<render::model> model)
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{
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moon_model = model;
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moon_shader_program = nullptr;
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if (moon_model)
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{
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moon_model_vao = model->get_vertex_array().get();
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for (const auto& group: model->get_groups())
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{
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moon_material = group.material.get();
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moon_model_drawing_mode = group.drawing_mode;
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moon_model_start_index = group.start_index;
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moon_model_index_count = group.index_count;
|
|
}
|
|
|
|
if (moon_material)
|
|
{
|
|
moon_shader_program = moon_material->get_shader_template()->build();
|
|
|
|
if (moon_shader_program)
|
|
{
|
|
moon_model_var = moon_shader_program->variable("model");
|
|
moon_view_projection_var = moon_shader_program->variable("view_projection");
|
|
moon_normal_model_var = moon_shader_program->variable("normal_model");
|
|
moon_camera_position_var = moon_shader_program->variable("camera_position");
|
|
moon_sunlight_direction_var = moon_shader_program->variable("sunlight_direction");
|
|
moon_sunlight_illuminance_var = moon_shader_program->variable("sunlight_illuminance");
|
|
moon_planetlight_direction_var = moon_shader_program->variable("planetlight_direction");
|
|
moon_planetlight_illuminance_var = moon_shader_program->variable("planetlight_illuminance");
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
moon_model = nullptr;
|
|
}
|
|
}
|
|
|
|
void sky_pass::set_stars_model(std::shared_ptr<render::model> model)
|
|
{
|
|
stars_model = model;
|
|
star_shader_program = nullptr;
|
|
|
|
if (stars_model)
|
|
{
|
|
stars_model_vao = model->get_vertex_array().get();
|
|
|
|
for (const auto& group: model->get_groups())
|
|
{
|
|
stars_model_drawing_mode = group.drawing_mode;
|
|
stars_model_start_index = group.start_index;
|
|
stars_model_index_count = group.index_count;
|
|
}
|
|
|
|
if (star_material)
|
|
{
|
|
star_shader_program = star_material->get_shader_template()->build();
|
|
|
|
if (star_shader_program)
|
|
{
|
|
star_model_view_var = star_shader_program->variable("model_view");
|
|
star_projection_var = star_shader_program->variable("projection");
|
|
star_distance_var = star_shader_program->variable("star_distance");
|
|
star_exposure_var = star_shader_program->variable("camera.exposure");
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
stars_model = nullptr;
|
|
}
|
|
}
|
|
|
|
void sky_pass::update_tweens()
|
|
{
|
|
observer_position_tween.update();
|
|
sun_position_tween.update();
|
|
sun_luminance_tween.update();
|
|
sun_illuminance_tween.update();
|
|
icrf_to_eus_translation.update();
|
|
icrf_to_eus_rotation.update();
|
|
|
|
moon_position_tween.update();
|
|
moon_rotation_tween.update();
|
|
moon_angular_radius_tween.update();
|
|
moon_sunlight_direction_tween.update();
|
|
moon_sunlight_illuminance_tween.update();
|
|
moon_planetlight_direction_tween.update();
|
|
moon_planetlight_illuminance_tween.update();
|
|
moon_illuminance_tween.update();
|
|
}
|
|
|
|
void sky_pass::set_magnification(float magnification)
|
|
{
|
|
this->magnification = magnification;
|
|
}
|
|
|
|
void sky_pass::set_icrf_to_eus(const math::transformation::se3<float>& transformation)
|
|
{
|
|
icrf_to_eus_translation[1] = transformation.t;
|
|
icrf_to_eus_rotation[1] = transformation.r;
|
|
}
|
|
|
|
void sky_pass::set_sun_position(const float3& position)
|
|
{
|
|
sun_position_tween[1] = position;
|
|
}
|
|
|
|
void sky_pass::set_sun_illuminance(const float3& illuminance, const float3& transmitted_illuminance)
|
|
{
|
|
sun_illuminance_tween[1] = illuminance;
|
|
sun_transmitted_illuminance = transmitted_illuminance;
|
|
}
|
|
|
|
void sky_pass::set_sun_luminance(const float3& luminance)
|
|
{
|
|
sun_luminance_tween[1] = luminance;
|
|
}
|
|
|
|
void sky_pass::set_sun_angular_radius(float radius)
|
|
{
|
|
sun_angular_radius = radius;
|
|
}
|
|
|
|
void sky_pass::set_planet_radius(float radius)
|
|
{
|
|
atmosphere_radii.x() = radius;
|
|
atmosphere_radii.y() = atmosphere_radii.x() + atmosphere_upper_limit;
|
|
atmosphere_radii.z() = atmosphere_radii.y() * atmosphere_radii.y();
|
|
observer_position_tween[1] = {0.0f, atmosphere_radii.x() + observer_elevation, 0.0f};
|
|
|
|
// Trigger transmittance LUT render
|
|
render_transmittance_lut = true;
|
|
}
|
|
|
|
void sky_pass::set_atmosphere_upper_limit(float limit)
|
|
{
|
|
atmosphere_upper_limit = limit;
|
|
atmosphere_radii.y() = atmosphere_radii.x() + atmosphere_upper_limit;
|
|
atmosphere_radii.z() = atmosphere_radii.y() * atmosphere_radii.y();
|
|
|
|
// Trigger transmittance LUT render
|
|
render_transmittance_lut = true;
|
|
}
|
|
|
|
void sky_pass::set_observer_elevation(float elevation)
|
|
{
|
|
observer_elevation = elevation;
|
|
observer_position_tween[1] = {0.0f, atmosphere_radii.x() + observer_elevation, 0.0f};
|
|
}
|
|
|
|
void sky_pass::set_rayleigh_parameters(float scale_height, const float3& scattering)
|
|
{
|
|
rayleigh_parameters =
|
|
{
|
|
-1.0f / scale_height,
|
|
scattering.x(),
|
|
scattering.y(),
|
|
scattering.z()
|
|
};
|
|
|
|
// Trigger transmittance LUT render
|
|
render_transmittance_lut = true;
|
|
}
|
|
|
|
void sky_pass::set_mie_parameters(float scale_height, float scattering, float extinction, float anisotropy)
|
|
{
|
|
mie_parameters =
|
|
{
|
|
-1.0f / scale_height,
|
|
scattering,
|
|
extinction,
|
|
anisotropy
|
|
};
|
|
|
|
// Trigger transmittance LUT render
|
|
render_transmittance_lut = true;
|
|
}
|
|
|
|
void sky_pass::set_ozone_parameters(float lower_limit, float upper_limit, float mode, const float3& absorption)
|
|
{
|
|
ozone_distribution =
|
|
{
|
|
1.0f / (lower_limit - mode),
|
|
1.0f / (upper_limit - mode),
|
|
mode
|
|
};
|
|
ozone_absorption = absorption;
|
|
|
|
// Trigger transmittance LUT render
|
|
render_transmittance_lut = true;
|
|
}
|
|
|
|
void sky_pass::set_airglow_illuminance(const float3& illuminance)
|
|
{
|
|
airglow_illuminance = illuminance;
|
|
}
|
|
|
|
void sky_pass::set_moon_position(const float3& position)
|
|
{
|
|
moon_position_tween[1] = position;
|
|
}
|
|
|
|
void sky_pass::set_moon_rotation(const math::quaternion<float>& rotation)
|
|
{
|
|
moon_rotation_tween[1] = rotation;
|
|
}
|
|
|
|
void sky_pass::set_moon_angular_radius(float angular_radius)
|
|
{
|
|
moon_angular_radius_tween[1] = angular_radius;
|
|
}
|
|
|
|
void sky_pass::set_moon_sunlight_direction(const float3& direction)
|
|
{
|
|
moon_sunlight_direction_tween[1] = direction;
|
|
}
|
|
|
|
void sky_pass::set_moon_sunlight_illuminance(const float3& illuminance)
|
|
{
|
|
moon_sunlight_illuminance_tween[1] = illuminance;
|
|
}
|
|
|
|
void sky_pass::set_moon_planetlight_direction(const float3& direction)
|
|
{
|
|
moon_planetlight_direction_tween[1] = direction;
|
|
}
|
|
|
|
void sky_pass::set_moon_planetlight_illuminance(const float3& illuminance)
|
|
{
|
|
moon_planetlight_illuminance_tween[1] = illuminance;
|
|
}
|
|
|
|
void sky_pass::set_moon_illuminance(const float3& illuminance, const float3& transmitted_illuminance)
|
|
{
|
|
moon_illuminance_tween[1] = illuminance;
|
|
moon_transmitted_illuminance = transmitted_illuminance;
|
|
}
|
|
|
|
void sky_pass::set_transmittance_lut_resolution(std::uint16_t width, std::uint16_t height)
|
|
{
|
|
transmittance_lut_texture->resize(width, height, nullptr);
|
|
transmittance_lut_framebuffer->resize({transmittance_lut_texture->get_width(), transmittance_lut_texture->get_height()});
|
|
transmittance_lut_resolution = {static_cast<float>(width), static_cast<float>(height)};
|
|
|
|
// Trigger transmittance LUT render
|
|
render_transmittance_lut = true;
|
|
}
|
|
|
|
void sky_pass::rebuild_transmittance_lut_command_buffer()
|
|
{
|
|
transmittance_lut_command_buffer.clear();
|
|
|
|
if (!transmittance_lut_shader_program->linked() || !transmittance_lut_texture)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// Bind framebuffer and shader program
|
|
transmittance_lut_command_buffer.emplace_back
|
|
(
|
|
[&]()
|
|
{
|
|
rasterizer->set_viewport(0, 0, transmittance_lut_texture->get_width(), transmittance_lut_texture->get_height());
|
|
rasterizer->use_framebuffer(*transmittance_lut_framebuffer);
|
|
rasterizer->use_program(*transmittance_lut_shader_program);
|
|
}
|
|
);
|
|
|
|
// Update shader variables
|
|
if (auto atmosphere_radii_var = transmittance_lut_shader_program->variable("atmosphere_radii"))
|
|
{
|
|
transmittance_lut_command_buffer.emplace_back([&, atmosphere_radii_var](){atmosphere_radii_var->update(atmosphere_radii);});
|
|
}
|
|
if (auto rayleigh_parameters_var = transmittance_lut_shader_program->variable("rayleigh_parameters"))
|
|
{
|
|
transmittance_lut_command_buffer.emplace_back([&, rayleigh_parameters_var](){rayleigh_parameters_var->update(rayleigh_parameters);});
|
|
}
|
|
if (auto mie_parameters_var = transmittance_lut_shader_program->variable("mie_parameters"))
|
|
{
|
|
transmittance_lut_command_buffer.emplace_back([&, mie_parameters_var](){mie_parameters_var->update(mie_parameters);});
|
|
}
|
|
if (auto ozone_distribution_var = transmittance_lut_shader_program->variable("ozone_distribution"))
|
|
{
|
|
transmittance_lut_command_buffer.emplace_back([&, ozone_distribution_var](){ozone_distribution_var->update(ozone_distribution);});
|
|
}
|
|
if (auto ozone_absorption_var = transmittance_lut_shader_program->variable("ozone_absorption"))
|
|
{
|
|
transmittance_lut_command_buffer.emplace_back([&, ozone_absorption_var](){ozone_absorption_var->update(ozone_absorption);});
|
|
}
|
|
if (auto resolution_var = transmittance_lut_shader_program->variable("resolution"))
|
|
{
|
|
transmittance_lut_command_buffer.emplace_back([&, resolution_var](){resolution_var->update(transmittance_lut_resolution);});
|
|
}
|
|
|
|
// Draw quad
|
|
transmittance_lut_command_buffer.emplace_back
|
|
(
|
|
[&]()
|
|
{
|
|
rasterizer->draw_arrays(*quad_vao, gl::drawing_mode::triangles, 0, 6);
|
|
}
|
|
);
|
|
}
|
|
|
|
void sky_pass::rebuild_sky_lut_command_buffer()
|
|
{
|
|
sky_lut_command_buffer.clear();
|
|
|
|
if (!sky_lut_shader_program->linked() || !sky_lut_texture)
|
|
{
|
|
return;
|
|
}
|
|
|
|
// Bind framebuffer and shader program
|
|
sky_lut_command_buffer.emplace_back
|
|
(
|
|
[&]()
|
|
{
|
|
rasterizer->set_viewport(0, 0, sky_lut_texture->get_width(), sky_lut_texture->get_height());
|
|
rasterizer->use_framebuffer(*sky_lut_framebuffer);
|
|
rasterizer->use_program(*sky_lut_shader_program);
|
|
}
|
|
);
|
|
|
|
// Update shader variables
|
|
if (auto light_direction_var = sky_lut_shader_program->variable("light_direction"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, light_direction_var](){light_direction_var->update(dominant_light_direction);});
|
|
}
|
|
if (auto light_illuminance_var = sky_lut_shader_program->variable("light_illuminance"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, light_illuminance_var](){light_illuminance_var->update(dominant_light_illuminance);});
|
|
}
|
|
if (auto atmosphere_radii_var = sky_lut_shader_program->variable("atmosphere_radii"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, atmosphere_radii_var](){atmosphere_radii_var->update(atmosphere_radii);});
|
|
}
|
|
if (auto observer_position_var = sky_lut_shader_program->variable("observer_position"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, observer_position_var](){observer_position_var->update(observer_position);});
|
|
}
|
|
if (auto rayleigh_parameters_var = sky_lut_shader_program->variable("rayleigh_parameters"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, rayleigh_parameters_var](){rayleigh_parameters_var->update(rayleigh_parameters);});
|
|
}
|
|
if (auto mie_parameters_var = sky_lut_shader_program->variable("mie_parameters"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, mie_parameters_var](){mie_parameters_var->update(mie_parameters);});
|
|
}
|
|
if (auto ozone_distribution_var = sky_lut_shader_program->variable("ozone_distribution"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, ozone_distribution_var](){ozone_distribution_var->update(ozone_distribution);});
|
|
}
|
|
if (auto ozone_absorption_var = sky_lut_shader_program->variable("ozone_absorption"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, ozone_absorption_var](){ozone_absorption_var->update(ozone_absorption);});
|
|
}
|
|
if (auto airglow_illuminance_var = sky_lut_shader_program->variable("airglow_illuminance"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, airglow_illuminance_var](){airglow_illuminance_var->update(airglow_illuminance * camera_exposure);});
|
|
}
|
|
if (auto resolution_var = sky_lut_shader_program->variable("resolution"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, resolution_var](){resolution_var->update(sky_lut_resolution);});
|
|
}
|
|
if (auto transmittance_lut_var = sky_lut_shader_program->variable("transmittance_lut"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, transmittance_lut_var](){transmittance_lut_var->update(*transmittance_lut_texture);});
|
|
}
|
|
if (auto transmittance_lut_resolution_var = sky_lut_shader_program->variable("transmittance_lut_resolution"))
|
|
{
|
|
sky_lut_command_buffer.emplace_back([&, transmittance_lut_resolution_var](){transmittance_lut_resolution_var->update(transmittance_lut_resolution);});
|
|
}
|
|
|
|
// Draw quad
|
|
sky_lut_command_buffer.emplace_back
|
|
(
|
|
[&]()
|
|
{
|
|
rasterizer->draw_arrays(*quad_vao, gl::drawing_mode::triangles, 0, 6);
|
|
}
|
|
);
|
|
}
|
|
|
|
} // namespace render
|