💿🐜 Antkeeper source code
https://antkeeper.com
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276 lines
9.7 KiB
276 lines
9.7 KiB
/*
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* Copyright (C) 2020 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 "painting-system.hpp"
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#include "game/components/transform-component.hpp"
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#include "game/components/brush-component.hpp"
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#include "game/components/tool-component.hpp"
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#include "event/event-dispatcher.hpp"
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#include "resources/resource-manager.hpp"
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#include "scene/scene.hpp"
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#include "scene/model-instance.hpp"
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#include "math/math.hpp"
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#include "renderer/material.hpp"
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#include "renderer/model.hpp"
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#include "utility/fundamental-types.hpp"
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#include "game/entity-commands.hpp"
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#include "game/components/collision-component.hpp"
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#include "game/components/transform-component.hpp"
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#include "rasterizer/vertex-buffer.hpp"
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#include "rasterizer/vertex-attribute-type.hpp"
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#include "renderer/vertex-attributes.hpp"
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#include <limits>
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using namespace ecs;
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painting_system::painting_system(entt::registry& registry, ::event_dispatcher* event_dispatcher, ::resource_manager* resource_manager):
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entity_system(registry),
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event_dispatcher(event_dispatcher),
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resource_manager(resource_manager),
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scene(nullptr),
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painting(false)
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{
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event_dispatcher->subscribe<tool_pressed_event>(this);
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event_dispatcher->subscribe<tool_released_event>(this);
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max_miter_angle = math::radians(135.0f);
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decal_offset = 0.01f;
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stroke_width = 1.0f;
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min_stroke_length = 1.0f;
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min_stroke_length_squared = min_stroke_length * min_stroke_length;
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max_stroke_segments = 4096;
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current_stroke_segment = 0;
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std::size_t vertex_size = 4;
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std::size_t vertex_stride = sizeof(float) * vertex_size;
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std::size_t vertex_count = max_stroke_segments * 6;
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// Create stroke model
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stroke_model = new model();
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stroke_model_group = stroke_model->add_group();
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stroke_model_group->set_material(resource_manager->load<material>("brushstroke.mtl"));
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// Setup stroke vbo and vao
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stroke_vbo = stroke_model->get_vertex_buffer();
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stroke_vbo->repurpose(sizeof(float) * vertex_size * vertex_count, nullptr, buffer_usage::dynamic_draw);
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stroke_model->get_vertex_array()->bind_attribute(VERTEX_POSITION_LOCATION, *stroke_vbo, 4, vertex_attribute_type::float_32, vertex_stride, 0);
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// Create stroke model instance
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stroke_model_instance = new model_instance();
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stroke_model_instance->set_model(stroke_model);
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stroke_model_instance->update_tweens();
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stroke_bounds_min.x = std::numeric_limits<float>::infinity();
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stroke_bounds_min.y = std::numeric_limits<float>::infinity();
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stroke_bounds_min.z = std::numeric_limits<float>::infinity();
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stroke_bounds_max.x = -std::numeric_limits<float>::infinity();
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stroke_bounds_max.y = -std::numeric_limits<float>::infinity();
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stroke_bounds_max.z = -std::numeric_limits<float>::infinity();
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midstroke = false;
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}
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painting_system::~painting_system()
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{
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event_dispatcher->unsubscribe<tool_pressed_event>(this);
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event_dispatcher->unsubscribe<tool_released_event>(this);
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}
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void painting_system::update(double t, double dt)
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{
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if (painting)
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{
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const tool_component& tool = registry.get<tool_component>(brush_entity);
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auto cast_result = cast_ray(tool.cursor);
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if (cast_result.has_value())
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{
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float3 p2 =
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stroke_end = cast_result.value();
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float3 segment_difference = stroke_end - stroke_start;
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float segment_length_squared = math::dot(segment_difference, segment_difference);
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if (segment_length_squared >= min_stroke_length_squared)
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{
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float segment_length = std::sqrt(segment_length_squared);
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float3 segment_forward = segment_difference / segment_length;
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float3 segment_right = math::normalize(math::cross(segment_forward, float3{0, 1, 0}));
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float3 segment_up = math::cross(segment_right, segment_forward);
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float3 segment_center = (stroke_start + stroke_end) * 0.5f;
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float3 p1 = stroke_start;
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float3 p2 = stroke_end;
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// Find miter
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float3 tangent = math::normalize(math::normalize(p2 - p1) + math::normalize(p1 - p0));
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float2 miter = float2{-tangent.z, tangent.x};
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float2 normal = float2{segment_right.x, segment_right.z};
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float miter_length = stroke_width / math::dot(miter, normal);
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float3 a = p0a;
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float3 b = p0b;
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float3 c = p1 - segment_right * stroke_width * 0.5f + segment_up * decal_offset;
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float3 d = p1 + segment_right * stroke_width * 0.5f + segment_up * decal_offset;
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float3 e = p2 - segment_right * stroke_width * 0.5f + segment_up * decal_offset;
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float3 f = p2 + segment_right * stroke_width * 0.5f + segment_up * decal_offset;
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// Adjust c and d
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bool mitered = false;
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if (midstroke)
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{
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float angle = std::acos(math::dot(math::normalize(p2 - p1), math::normalize(p1 - p0)));
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if (angle < max_miter_angle)
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{
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mitered = true;
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c = p1 - float3{miter.x, 0.0f, miter.y} * miter_length * 0.5f + segment_up * decal_offset;
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d = p1 + float3{miter.x, 0.0f, miter.y} * miter_length * 0.5f + segment_up * decal_offset;
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}
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}
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float4 segment_vertices[12];
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float w = static_cast<float>(t);
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segment_vertices[0] = {a.x, a.y, a.z, w};
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segment_vertices[1] = {b.x, b.y, b.z, w};
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segment_vertices[2] = {c.x, c.y, c.z, w};
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segment_vertices[3] = {c.x, c.y, c.z, w};
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segment_vertices[4] = {b.x, b.y, b.z, w};
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segment_vertices[5] = {d.x, d.y, d.z, w};
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segment_vertices[6] = {c.x, c.y, c.z, w};
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segment_vertices[7] = {d.x, d.y, d.z, w};
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segment_vertices[8] = {e.x, e.y, e.z, w};
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segment_vertices[9] = {e.x, e.y, e.z, w};
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segment_vertices[10] = {d.x, d.y, d.z, w};
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segment_vertices[11] = {f.x, f.y, f.z, w};
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std::size_t segment_size = sizeof(float) * 4 * 6;
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if (mitered)
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{
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stroke_vbo->update((current_stroke_segment - 1) * segment_size, segment_size * 2, &segment_vertices[0][0]);
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}
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else
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{
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stroke_vbo->update(current_stroke_segment * segment_size, segment_size, &segment_vertices[6][0]);
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}
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++current_stroke_segment;
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stroke_model_group->set_index_count(current_stroke_segment * 6);
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// Update stroke bounds
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stroke_bounds_min.x = std::min<float>(stroke_bounds_min.x, std::min<float>(c.x, std::min<float>(d.x, std::min<float>(e.x, f.x))));
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stroke_bounds_min.y = std::min<float>(stroke_bounds_min.y, std::min<float>(c.y, std::min<float>(d.y, std::min<float>(e.y, f.y))));
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stroke_bounds_min.z = std::min<float>(stroke_bounds_min.z, std::min<float>(c.z, std::min<float>(d.z, std::min<float>(e.z, f.z))));
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stroke_bounds_max.x = std::max<float>(stroke_bounds_max.x, std::max<float>(c.x, std::max<float>(d.x, std::max<float>(e.x, f.x))));
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stroke_bounds_max.y = std::max<float>(stroke_bounds_max.y, std::max<float>(c.y, std::max<float>(d.y, std::max<float>(e.y, f.y))));
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stroke_bounds_max.z = std::max<float>(stroke_bounds_max.z, std::max<float>(c.z, std::max<float>(d.z, std::max<float>(e.z, f.z))));
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stroke_model->set_bounds(aabb<float>{stroke_bounds_min, stroke_bounds_max});
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stroke_model_instance->update_bounds();
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p0 = stroke_start;
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p0a = c;
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p0b = d;
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stroke_start = stroke_end;
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midstroke = true;
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}
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}
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}
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}
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void painting_system::set_scene(::scene* scene)
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{
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this->scene = scene;
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scene->add_object(stroke_model_instance);
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}
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void painting_system::handle_event(const tool_pressed_event& event)
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{
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if (registry.has<brush_component>(event.entity))
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{
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auto cast_result = cast_ray(event.position);
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if (cast_result.has_value())
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{
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brush_entity = event.entity;
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painting = true;
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stroke_start = cast_result.value();
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stroke_end = stroke_start;
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p0 = stroke_start;
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p0a = p0;
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p0b = p0;
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midstroke = false;
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}
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}
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}
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void painting_system::handle_event(const tool_released_event& event)
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{
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if (registry.has<brush_component>(event.entity))
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{
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auto cast_result = cast_ray(ec::get_world_transform(registry, event.entity).translation);
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if (cast_result.has_value())
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{
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stroke_end = cast_result.value();
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}
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brush_entity = entt::null;
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painting = false;
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}
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}
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std::optional<float3> painting_system::cast_ray(const float3& position) const
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{
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std::optional<float3> result;
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ray<float> untransformed_ray = {position + float3{0.0f, 10000.0f, 0.0f}, {0, -1, 0}};
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float min_distance = std::numeric_limits<float>::infinity();
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registry.view<transform_component, collision_component>().each(
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[&](auto entity, auto& collision_transform, auto& collision)
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{
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// Transform ray into local space of collision component
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math::transform<float> inverse_transform = math::inverse(collision_transform.local);
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float3 origin = inverse_transform * untransformed_ray.origin;
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float3 direction = math::normalize(math::conjugate(collision_transform.local.rotation) * untransformed_ray.direction);
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ray<float> transformed_ray = {origin, direction};
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// Broad phase AABB test
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auto aabb_result = ray_aabb_intersection(transformed_ray, collision.bounds);
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if (!std::get<0>(aabb_result))
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{
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return;
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}
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// Narrow phase mesh test
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auto mesh_result = collision.mesh_accelerator.query_nearest(transformed_ray);
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if (mesh_result)
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{
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if (mesh_result->t < min_distance)
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{
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min_distance = mesh_result->t;
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result = untransformed_ray.extrapolate(min_distance);
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}
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}
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});
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return result;
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}
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