💿🐜 Antkeeper source code
https://antkeeper.com
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467 lines
15 KiB
467 lines
15 KiB
/*
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* Copyright (C) 2021 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 "renderer/passes/sky-pass.hpp"
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#include "resources/resource-manager.hpp"
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#include "resources/string-table.hpp"
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#include "gl/rasterizer.hpp"
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#include "gl/framebuffer.hpp"
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#include "gl/shader-program.hpp"
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#include "gl/shader-input.hpp"
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#include "gl/vertex-buffer.hpp"
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#include "gl/vertex-array.hpp"
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#include "gl/vertex-attribute-type.hpp"
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#include "gl/drawing-mode.hpp"
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#include "gl/texture-2d.hpp"
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#include "gl/texture-wrapping.hpp"
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#include "gl/texture-filter.hpp"
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#include "renderer/vertex-attributes.hpp"
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#include "renderer/render-context.hpp"
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#include "renderer/model.hpp"
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#include "renderer/material.hpp"
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#include "scene/camera.hpp"
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#include "utility/fundamental-types.hpp"
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#include "color/color.hpp"
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#include "astro/illuminance.hpp"
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#include "math/interpolation.hpp"
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#include "geom/cartesian.hpp"
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#include "geom/spherical.hpp"
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#include "physics/orbit/orbit.hpp"
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#include "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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#include <iostream>
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sky_pass::sky_pass(gl::rasterizer* rasterizer, const gl::framebuffer* framebuffer, resource_manager* resource_manager):
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render_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_shader_program(nullptr),
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moon_model(nullptr),
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moon_material(nullptr),
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moon_model_vao(nullptr),
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moon_shader_program(nullptr),
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time_tween(nullptr),
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observer_altitude_tween(0.0f, math::lerp<float, float>),
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sun_position_tween(float3{1.0f, 0.0f, 0.0f}, math::lerp<float3, float>),
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sun_color_tween(float3{1.0f, 1.0f, 1.0f}, math::lerp<float3, float>),
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topocentric_frame_translation({0, 0, 0}, math::lerp<float3, float>),
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topocentric_frame_rotation(math::quaternion<float>::identity(), math::nlerp<float>)
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{
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// Load star catalog
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string_table* star_catalog = resource_manager->load<string_table>("stars.csv");
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// Allocate star catalog vertex data
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star_count = 0;
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if (star_catalog->size() > 0)
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star_count = star_catalog->size() - 1;
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std::size_t star_vertex_size = 6;
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std::size_t star_vertex_stride = star_vertex_size * sizeof(float);
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float* star_vertex_data = new float[star_count * star_vertex_size];
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float* star_vertex = star_vertex_data;
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// Build star catalog vertex data
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for (std::size_t i = 1; i < star_catalog->size(); ++i)
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{
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const string_table_row& catalog_row = (*star_catalog)[i];
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double ra = 0.0;
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double dec = 0.0;
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double vmag = 0.0;
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double bv_color = 0.0;
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// Parse star catalog entry
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try
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{
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ra = std::stod(catalog_row[1]);
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dec = std::stod(catalog_row[2]);
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vmag = std::stod(catalog_row[3]);
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bv_color = std::stod(catalog_row[4]);
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}
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catch (const std::exception& e)
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{
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continue;
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}
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// Convert right ascension and declination from degrees to radians
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ra = math::wrap_radians(math::radians(ra));
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dec = math::wrap_radians(math::radians(dec));
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// Transform spherical equatorial coordinates to rectangular equatorial coordinates
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double3 position_bci = geom::spherical::to_cartesian(double3{1.0, dec, ra});
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// Transform coordinates from equatorial space to inertial space
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physics::frame<double> bci_to_inertial = physics::orbit::inertial::to_bci({0, 0, 0}, 0.0, math::radians(23.4393)).inverse();
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double3 position_inertial = bci_to_inertial * position_bci;
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// Convert color index to color temperature
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double cct = color::index::bv_to_cct(bv_color);
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// Calculate XYZ color from color temperature
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double3 color_xyz = color::cct::to_xyz(cct);
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// Transform XYZ color to ACEScg colorspace
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double3 color_acescg = color::xyz::to_acescg(color_xyz);
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// Convert apparent magnitude to irradiance (W/m^2)
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double vmag_irradiance = std::pow(10.0, 0.4 * (-vmag - 19.0 + 0.4));
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// Convert irradiance to illuminance
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double vmag_illuminance = vmag_irradiance * (683.0 * 0.14);
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// Scale color by illuminance
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double3 scaled_color = color_acescg * vmag_illuminance;
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// Build vertex
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*(star_vertex++) = static_cast<float>(position_inertial.x);
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*(star_vertex++) = static_cast<float>(position_inertial.y);
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*(star_vertex++) = static_cast<float>(position_inertial.z);
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*(star_vertex++) = static_cast<float>(scaled_color.x);
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*(star_vertex++) = static_cast<float>(scaled_color.y);
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*(star_vertex++) = static_cast<float>(scaled_color.z);
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}
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// Unload star catalog
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resource_manager->unload("stars.csv");
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// Create star catalog VBO
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star_catalog_vbo = new gl::vertex_buffer(star_count * star_vertex_stride, star_vertex_data);
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// Create star catalog VAO
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star_catalog_vao = new gl::vertex_array();
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// Bind star catalog vertex attributes
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std::size_t vao_offset = 0;
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star_catalog_vao->bind_attribute(VERTEX_POSITION_LOCATION, *star_catalog_vbo, 3, gl::vertex_attribute_type::float_32, star_vertex_stride, 0);
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vao_offset += 3;
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star_catalog_vao->bind_attribute(VERTEX_COLOR_LOCATION, *star_catalog_vbo, 3, gl::vertex_attribute_type::float_32, star_vertex_stride, sizeof(float) * vao_offset);
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// Free star catalog vertex data
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delete[] star_vertex_data;
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// Load star shader
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star_shader_program = resource_manager->load<gl::shader_program>("star.glsl");
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star_model_view_input = star_shader_program->get_input("model_view");
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star_projection_input = star_shader_program->get_input("projection");
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star_distance_input = star_shader_program->get_input("star_distance");
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star_exposure_input = star_shader_program->get_input("camera.exposure");
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}
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sky_pass::~sky_pass()
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{}
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void sky_pass::render(render_context* context) const
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{
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rasterizer->use_framebuffer(*framebuffer);
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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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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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float time = (*time_tween)[context->alpha];
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float2 resolution = {static_cast<float>(std::get<0>(viewport)), static_cast<float>(std::get<1>(viewport))};
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const scene::camera& camera = *context->camera;
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float clip_near = camera.get_clip_near_tween().interpolate(context->alpha);
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float clip_far = camera.get_clip_far_tween().interpolate(context->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::identity4x4<float>, model_scale);
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float4x4 view = math::resize<4, 4>(math::resize<3, 3>(camera.get_view_tween().interpolate(context->alpha)));
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float4x4 model_view = view * model;
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float4x4 projection = camera.get_projection_tween().interpolate(context->alpha);
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float4x4 view_projection = projection * view;
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float4x4 model_view_projection = projection * model_view;
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float exposure = std::exp2(camera.get_exposure_tween().interpolate(context->alpha));
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// Interpolate observer altitude
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float observer_altitude = observer_altitude_tween.interpolate(context->alpha);
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// Construct tweened inertial to topocentric frame
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physics::frame<float> topocentric_frame =
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{
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topocentric_frame_translation.interpolate(context->alpha),
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topocentric_frame_rotation.interpolate(context->alpha)
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};
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// Get topocentric space direction to sun
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float3 sun_position = sun_position_tween.interpolate(context->alpha);
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float3 sun_direction = math::normalize(sun_position);
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// Interpolate sun color
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float3 sun_color = sun_color_tween.interpolate(context->alpha);
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// Draw sky model
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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_input)
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model_view_projection_input->upload(model_view_projection);
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if (mouse_input)
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mouse_input->upload(mouse_position);
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if (resolution_input)
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resolution_input->upload(resolution);
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if (time_input)
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time_input->upload(time);
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if (exposure_input)
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exposure_input->upload(exposure);
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if (observer_altitude_input)
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observer_altitude_input->upload(observer_altitude);
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if (sun_direction_input)
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sun_direction_input->upload(sun_direction);
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if (sun_angular_radius_input)
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sun_angular_radius_input->upload(sun_angular_radius);
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if (sun_color_input)
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sun_color_input->upload(sun_color);
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if (scale_height_rm_input)
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scale_height_rm_input->upload(scale_height_rm);
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if (rayleigh_scattering_input)
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rayleigh_scattering_input->upload(rayleigh_scattering);
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if (mie_scattering_input)
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mie_scattering_input->upload(mie_scattering);
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if (mie_anisotropy_input)
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mie_anisotropy_input->upload(mie_anisotropy);
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if (atmosphere_radii_input)
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atmosphere_radii_input->upload(atmosphere_radii);
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sky_material->upload(context->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 moon model
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/*
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float3 moon_position = {0, 0, 0};
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if (moon_position.y >= -moon_angular_radius)
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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 = moon_position * -moon_distance;
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moon_transform.rotation = math::quaternion<float>::identity();
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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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model_view = view * model;
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model_view_projection = projection * model_view;
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float3x3 normal_model = math::transpose(math::inverse(math::resize<3, 3>(model)));
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rasterizer->use_program(*moon_shader_program);
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if (moon_model_view_projection_input)
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moon_model_view_projection_input->upload(model_view_projection);
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if (moon_normal_model_input)
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moon_normal_model_input->upload(normal_model);
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if (moon_moon_position_input)
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moon_moon_position_input->upload(moon_position);
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if (moon_sun_position_input)
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moon_sun_position_input->upload(sun_position);
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moon_material->upload(context->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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// Draw stars
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{
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float star_distance = (clip_near + clip_far) * 0.5f;
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model = math::resize<4, 4>(math::matrix_cast<float>(topocentric_frame.rotation));
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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_input)
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star_model_view_input->upload(model_view);
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if (star_projection_input)
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star_projection_input->upload(projection);
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if (star_distance_input)
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star_distance_input->upload(star_distance);
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if (star_exposure_input)
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star_exposure_input->upload(exposure);
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rasterizer->draw_arrays(*star_catalog_vao, gl::drawing_mode::points, 0, star_count);
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}
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}
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void sky_pass::set_sky_model(const model* model)
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{
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sky_model = model;
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if (sky_model)
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{
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sky_model_vao = model->get_vertex_array();
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const std::vector<model_group*>& groups = *model->get_groups();
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for (model_group* group: groups)
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{
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sky_material = group->get_material();
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sky_model_drawing_mode = group->get_drawing_mode();
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sky_model_start_index = group->get_start_index();
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sky_model_index_count = group->get_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_program();
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if (sky_shader_program)
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{
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model_view_projection_input = sky_shader_program->get_input("model_view_projection");
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mouse_input = sky_shader_program->get_input("mouse");
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resolution_input = sky_shader_program->get_input("resolution");
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time_input = sky_shader_program->get_input("time");
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exposure_input = sky_shader_program->get_input("camera.exposure");
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observer_altitude_input = sky_shader_program->get_input("observer_altitude");
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sun_direction_input = sky_shader_program->get_input("sun_direction");
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sun_color_input = sky_shader_program->get_input("sun_color");
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sun_angular_radius_input = sky_shader_program->get_input("sun_angular_radius");
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scale_height_rm_input = sky_shader_program->get_input("scale_height_rm");
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rayleigh_scattering_input = sky_shader_program->get_input("rayleigh_scattering");
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mie_scattering_input = sky_shader_program->get_input("mie_scattering");
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mie_anisotropy_input = sky_shader_program->get_input("mie_anisotropy");
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atmosphere_radii_input = sky_shader_program->get_input("atmosphere_radii");
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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(const model* model)
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{
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moon_model = model;
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if (moon_model)
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{
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moon_model_vao = model->get_vertex_array();
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const std::vector<model_group*>& groups = *model->get_groups();
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for (model_group* group: groups)
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{
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moon_material = group->get_material();
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moon_model_drawing_mode = group->get_drawing_mode();
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moon_model_start_index = group->get_start_index();
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moon_model_index_count = group->get_index_count();
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}
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if (moon_material)
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{
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moon_shader_program = moon_material->get_shader_program();
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if (moon_shader_program)
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{
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moon_model_view_projection_input = moon_shader_program->get_input("model_view_projection");
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moon_normal_model_input = moon_shader_program->get_input("normal_model");
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moon_moon_position_input = moon_shader_program->get_input("moon_position");
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moon_sun_position_input = moon_shader_program->get_input("sun_position");
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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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moon_model = nullptr;
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}
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}
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void sky_pass::update_tweens()
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{
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observer_altitude_tween.update();
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sun_position_tween.update();
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sun_color_tween.update();
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topocentric_frame_translation.update();
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topocentric_frame_rotation.update();
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}
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void sky_pass::set_time_tween(const tween<double>* time)
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{
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this->time_tween = time;
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}
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void sky_pass::set_topocentric_frame(const physics::frame<float>& frame)
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{
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topocentric_frame_translation[1] = frame.translation;
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topocentric_frame_rotation[1] = frame.rotation;
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}
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void sky_pass::set_sun_position(const float3& position)
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{
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sun_position_tween[1] = position;
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}
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void sky_pass::set_sun_color(const float3& color)
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{
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sun_color_tween[1] = color;
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}
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void sky_pass::set_sun_angular_radius(float radius)
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{
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sun_angular_radius = radius;
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}
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void sky_pass::set_observer_altitude(float altitude)
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{
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observer_altitude_tween[1] = altitude;
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}
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void sky_pass::set_scale_heights(float rayleigh, float mie)
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{
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scale_height_rm = {rayleigh, mie};
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}
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void sky_pass::set_scattering_coefficients(const float3& r, const float3& m)
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{
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rayleigh_scattering = r;
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mie_scattering = m;
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}
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void sky_pass::set_mie_anisotropy(float g)
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{
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mie_anisotropy = {g, g * g};
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}
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void sky_pass::set_atmosphere_radii(float inner, float outer)
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{
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atmosphere_radii.x = inner;
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atmosphere_radii.y = outer;
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atmosphere_radii.z = outer * outer;
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}
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void sky_pass::handle_event(const mouse_moved_event& event)
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{
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mouse_position = {static_cast<float>(event.x), static_cast<float>(event.y)};
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}
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