// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
/*
Krakatoa SR API example file.

EXAMPLE 5
-Loads a mesh from a .obj file
-Fill it with particles
-Adds a direct light
-exr output
*/

#include <iostream>
#include <krakatoasr_renderer.hpp>

int main( void ) {
    try {
        // In this example we are creating a mesh object from a file and then filling it with particles, we are then
        // illuminating those particles wit a light

        // To start we create the renderer object
        krakatoasr::krakatoa_renderer renderer;
        // We then set the render resolution. Since this is the default it is not necessary however is normally
        // included.
        renderer.set_render_resolution( 640, 480 );
        // here we are creating a transform that we will be applying to the camera to move it 10 units in the z
        // direction
        krakatoasr::animated_transform cameraTransform =
            krakatoasr::animated_transform( 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 10, 1 );
        // we now apply the transform to the camera
        renderer.set_camera_tm( cameraTransform );
        // create the triangle mesh object
        krakatoasr::triangle_mesh mesh;
        // set the mesh by loading in the file boxmesh.obj, the first parameter is which mesh object you want to fill
        mesh.load_from_file( mesh, "boxmesh.obj" );
        // create the particle stream from the mesh with voxel spacing of 0.1, 1 subdivision, jittered particles and 2
        // particles per jitter
        krakatoasr::particle_stream stream =
            krakatoasr::particle_stream::create_from_mesh_volume( mesh, .1, 1, true, 2 );
        // add the particle stream to the renderer
        renderer.add_particle_stream( stream );

        // Create a direct light to illuminate the particles originaly starts at the origin
        krakatoasr::direct_light dLight = krakatoasr::direct_light();
        // change the flux of the light, normal is 12,12,12 which is white light we are using yellow light
        dLight.set_flux( 20, 20, 0 );
        // add the light and specify that we want it 4 units from the origin
        renderer.add_light( &dLight, krakatoasr::animated_transform( 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 4, 1 ) );

        // we now create a file saver to let krakatoa know where we want our results to go
        krakatoasr::file_saver fileSaver = krakatoasr::file_saver( "example05.exr" );
        // add the file saver to the renderer
        renderer.set_render_save_callback( &fileSaver );
        // and finally start the render
        renderer.render();
    } catch( std::exception& e ) {
        std::cerr << e.what() << std::endl;
        return 1;
    }
    return 0;
}