💿🐜 Antkeeper source code
https://antkeeper.com
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359 lines
12 KiB
359 lines
12 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 "painting-system.hpp"
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#include "ecs/components/transform-component.hpp"
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#include "ecs/components/brush-component.hpp"
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#include "ecs/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 "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 "ecs/commands.hpp"
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#include "ecs/components/collision-component.hpp"
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#include "ecs/components/transform-component.hpp"
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#include "gl/vertex-buffer.hpp"
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#include "gl/vertex-attribute-type.hpp"
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#include "renderer/vertex-attributes.hpp"
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#include "geom/mesh-functions.hpp"
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#include <limits>
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namespace ecs {
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painting_system::painting_system(ecs::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_collection(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 = 1.5f;
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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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vertex_size = 13;
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vertex_stride = sizeof(float) * vertex_size;
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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, gl::buffer_usage::dynamic_draw);
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stroke_model->get_vertex_array()->bind_attribute(VERTEX_POSITION_LOCATION, *stroke_vbo, 4, gl::vertex_attribute_type::float_32, vertex_stride, 0);
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stroke_model->get_vertex_array()->bind_attribute(VERTEX_NORMAL_LOCATION, *stroke_vbo, 3, gl::vertex_attribute_type::float_32, vertex_stride, sizeof(float) * 4);
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stroke_model->get_vertex_array()->bind_attribute(VERTEX_TEXCOORD_LOCATION, *stroke_vbo, 2, gl::vertex_attribute_type::float_32, vertex_stride, sizeof(float) * 7);
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stroke_model->get_vertex_array()->bind_attribute(VERTEX_TANGENT_LOCATION, *stroke_vbo, 4, gl::vertex_attribute_type::float_32, vertex_stride, sizeof(float) * 9);
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// Create stroke model instance
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stroke_model_instance = new scene::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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stroke_end = std::get<0>(cast_result.value());
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float3 surface_normal = std::get<1>(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, surface_normal));
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float3 segment_up = math::cross(segment_right, segment_forward);
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float angle = std::acos(math::dot(segment_forward, float3{0, 0, -1}));
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float3 cross = math::cross(segment_forward, float3{0, 0, -1});
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if (math::dot(surface_normal, cross) < 0.0f)
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angle = -angle;
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math::quaternion<float> tangent_rotation = math::normalize(math::angle_axis(-angle, surface_normal));
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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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const float3 positions[] =
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{
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a, b, c,
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c, b, d,
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c, d, e,
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e, d, f
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};
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const float w = static_cast<float>(t);
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float2 texcoords[] =
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{
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{0, 0}, {1, 0}, {0, 1},
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{0, 1}, {1, 0}, {1, 1},
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{0, 0}, {1, 0}, {0, 1},
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{0, 1}, {1, 0}, {1, 1},
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};
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float3 tangent_positions[] =
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{
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{0, 0, 0}, {1, 0, 0}, {0, 0, 1},
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{0, 0, 1}, {1, 0, 0}, {1, 0, 1},
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{0, 0, 0}, {1, 0, 0}, {0, 0, 1},
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{0, 0, 1}, {1, 0, 0}, {1, 0, 1}
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};
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/// @TODO: smooth normals in middle of segment
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float4 tangents[12];
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for (int i = 0; i < 4; ++i)
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{
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const float3& a = tangent_positions[i * 3];
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const float3& b = tangent_positions[i * 3 + 1];
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const float3& c = tangent_positions[i * 3 + 2];
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const float2& uva = texcoords[i * 3];
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const float2& uvb = texcoords[i * 3 + 1];
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const float2& uvc = texcoords[i * 3 + 2];
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float3 ba = b - a;
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float3 ca = c - a;
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float2 uvba = uvb - uva;
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float2 uvca = uvc - uva;
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float f = 1.0f / (uvba.x * uvca.y - uvca.x * uvba.y);
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float3 tangent = math::normalize((ba * uvca.y - ca * uvba.y) * f);
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float3 bitangent = math::normalize((ba * -uvca.x + ca * uvba.x) * f);
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// Rotate tangent and bitangent according to segment rotation
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tangent = math::normalize(tangent_rotation * tangent);
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bitangent = math::normalize(tangent_rotation * bitangent);
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// Calculate sign of bitangent
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float bitangent_sign = (math::dot(math::cross(surface_normal, tangent), bitangent) < 0.0f) ? -1.0f : 1.0f;
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tangents[i * 3] = {tangent.x, tangent.y, tangent.z, bitangent_sign};
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tangents[i * 3 + 1] = {tangent.x, tangent.y, tangent.z, bitangent_sign};
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tangents[i * 3 + 2] = {tangent.x, tangent.y, tangent.z, bitangent_sign};
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}
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float vertex_data[13 * 12];
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float* v = &vertex_data[0];
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for (int i = 0; i < 12; ++i)
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{
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*(v++) = positions[i].x;
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*(v++) = positions[i].y;
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*(v++) = positions[i].z;
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*(v++) = w;
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*(v++) = surface_normal.x;
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*(v++) = surface_normal.y;
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*(v++) = surface_normal.z;
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*(v++) = texcoords[i].x;
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*(v++) = texcoords[i].y;
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*(v++) = tangents[i].x;
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*(v++) = tangents[i].y;
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*(v++) = tangents[i].z;
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*(v++) = tangents[i].w;
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}
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std::size_t segment_size = sizeof(float) * vertex_size * 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, &vertex_data[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, &vertex_data[vertex_size * 6]);
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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(geom::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::collection* collection)
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{
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this->scene_collection = collection;
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scene_collection->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 = std::get<0>(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(command::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 = std::get<0>(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<std::tuple<float3, float3>> painting_system::cast_ray(const float3& position) const
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{
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std::optional<std::tuple<float3, float3>> result;
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float3 intersection;
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float3 surface_normal;
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geom::mesh::face* face = nullptr;
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geom::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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[&](ecs::entity 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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geom::ray<float> transformed_ray = {origin, direction};
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// Broad phase AABB test
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auto aabb_result = geom::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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intersection = untransformed_ray.extrapolate(min_distance);
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face = mesh_result->face;
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}
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}
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});
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if (face != nullptr)
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{
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surface_normal = calculate_face_normal(*face);
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result = std::make_tuple(intersection, surface_normal);
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}
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return result;
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}
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} // namespace ecs
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