static-mesh.cpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <engine/scene/static-mesh.hpp>
#include <engine/render/model.hpp>
#include <engine/render/material.hpp>
#include <engine/scene/camera.hpp>
 
namespace scene {
 
static_mesh::static_mesh(std::shared_ptr<render::model> model)
{
    set_model(model);
}
 
void static_mesh::set_model(std::shared_ptr<render::model> model)
{
    m_model = model;
    
    if (m_model)
    {
        m_operations.resize(m_model->get_groups().size());
        for (std::size_t i = 0; i < m_operations.size(); ++i)
        {
            const auto& group = m_model->get_groups()[i];
            auto& operation = m_operations[i];
            
            operation.primitive_topology = group.primitive_topology;
            operation.vertex_array = m_model->get_vertex_array().get();
            operation.vertex_buffer = m_model->get_vertex_buffer().get();
            operation.vertex_offset = m_model->get_vertex_offset();
            operation.vertex_stride = m_model->get_vertex_stride();
            operation.first_vertex = group.first_vertex;
            operation.vertex_count = group.vertex_count;
            operation.first_instance = 0;
            operation.instance_count = 1;
            operation.material = group.material;
        }
    }
    else
    {
        m_operations.clear();
    }
    
    transformed();
}
 
void static_mesh::set_material(std::size_t index, std::shared_ptr<render::material> material)
{
    if (material)
    {
        m_operations[index].material = material;
    }
    else
    {
        m_operations[index].material = m_model->get_groups()[index].material;
    }
}
 
void static_mesh::reset_materials()
{
    for (std::size_t i = 0; i < m_operations.size(); ++i)
    {
        m_operations[i].material = m_model->get_groups()[i].material;
    }
}
 
void static_mesh::update_bounds()
{
    if (m_model)
    {
        // Get model bounds
        const auto& model_bounds = m_model->get_bounds();
        
        // Naive algorithm: transform each corner of the model AABB
        m_bounds = {math::fvec3::infinity(), -math::fvec3::infinity()};
        for (std::size_t i = 0; i < 8; ++i)
        {
            m_bounds.extend(get_transform() * model_bounds.corner(i));
        }
    }
    else
    {
        m_bounds = {get_translation(), get_translation()};
    }
}
 
void static_mesh::transformed()
{
    update_bounds();
    
    const math::fmat4 transform_matrix = get_transform().matrix();
    for (auto& operation: m_operations)
    {
        operation.transform = transform_matrix;
    }
}
 
void static_mesh::render(render::context& ctx) const
{
    const float depth = ctx.camera->get_view_frustum().near().distance(get_translation());
    for (auto& operation: m_operations)
    {
        operation.depth = depth;
        operation.layer_mask = get_layer_mask();
        ctx.operations.push_back(&operation);
    }
}
 
} // namespace scene