renderer.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/render/renderer.hpp>
#include <engine/render/context.hpp>
#include <engine/render/compositor.hpp>
#include <engine/scene/collection.hpp>
#include <engine/scene/camera.hpp>
#include <engine/scene/static-mesh.hpp>
#include <engine/scene/billboard.hpp>
#include <engine/scene/light-probe.hpp>
#include <engine/scene/text.hpp>
#include <engine/render/model.hpp>
#include <engine/math/matrix.hpp>
#include <engine/geom/projection.hpp>
#include <engine/config.hpp>
#include <engine/math/quaternion.hpp>
#include <engine/math/numbers.hpp>
#include <functional>
#include <set>
 
namespace render {
 
renderer::renderer(gl::pipeline& pipeline, ::resource_manager& resource_manager)
{
    m_light_probe_stage = std::make_unique<render::light_probe_stage>(pipeline, resource_manager);
    m_cascaded_shadow_map_stage = std::make_unique<render::cascaded_shadow_map_stage>(pipeline, resource_manager);
    m_culling_stage = std::make_unique<render::culling_stage>();
    m_queue_stage = std::make_unique<render::queue_stage>();
}
 
void renderer::render(float t, float dt, float alpha, scene::collection& collection)
{
    // Init render context
    m_ctx.collection = &collection;
    m_ctx.t = t;
    m_ctx.dt = dt;
    m_ctx.alpha = alpha;
    
    // Execute light probe stage
    m_light_probe_stage->execute(m_ctx);
    
    // Get list of cameras to be sorted
    const auto& cameras = collection.get_objects(scene::camera::object_type_id);
    
    // Process cameras in order
    for (scene::object_base* camera_object: cameras)
    {
        scene::camera& camera = static_cast<scene::camera&>(*camera_object);
        
        // Skip cameras with no compositors
        compositor* compositor = camera.get_compositor();
        if (!compositor)
        {
            continue;
        }
        
        // Update render context camera
        m_ctx.camera = &camera;
        
        // Clear render queues
        m_ctx.objects.clear();
        m_ctx.operations.clear();
        
        // Execute cascaded shadow map stage
        m_cascaded_shadow_map_stage->execute(m_ctx);
        
        // Execute culling stage
        m_culling_stage->execute(m_ctx);
        
        // Execute queue stage
        m_queue_stage->execute(m_ctx);
        
        // Pass render context to the camera's compositor
        compositor->composite(m_ctx);
    }
}
 
} // namespace render