caper 0.13.0

Minimalist game framework
Documentation 
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extern crate caper;

extern crate imgui;

use caper::game::*;
use caper::input::Key;
use caper::mesh::{gen_perlin_mesh, gen_sphere, get_pos_perlin};
use caper::types::{
    DefaultTag, MaterialBuilder, RenderItemBuilder, TextItemBuilder, TransformBuilder,
};
use caper::utils::create_skydome;
use imgui::*;

fn main() {
    let (mut game, event_loop) = Game::<DefaultTag>::new();

    let map_size = 100f32;
    let fixed_val = -(map_size / 2f32);
    let move_speed = 0.1f32;
    let mouse_speed = 1f32;
    let sphere_pos = (8f32, 10f32);

    let mut pseu_cam_pos = (0f32, 0f32);
    let mut movement_dirty = true;
    let mut debug_mode = false;
    let mut test_check = false;

    // create a vector of render items
    game.add_render_item(
        RenderItemBuilder::default()
            .vertices(gen_perlin_mesh(pseu_cam_pos, map_size))
            .material(
                MaterialBuilder::default()
                    .shader_name("height")
                    .build()
                    .unwrap(),
            )
            .instance_transforms(vec![TransformBuilder::default()
                .pos((fixed_val, 0.0, fixed_val))
                .cull(false)
                .build()
                .unwrap()])
            .build()
            .unwrap(),
    );
    game.add_render_item(create_skydome("height"));
    game.add_render_item(
        RenderItemBuilder::default()
            .name("sphere")
            .vertices(gen_sphere())
            .material(
                MaterialBuilder::default()
                    .shader_name("line")
                    .build()
                    .unwrap(),
            )
            .instance_transforms(vec![TransformBuilder::default()
                .pos((sphere_pos.0, 3.0, sphere_pos.1))
                .build()
                .unwrap()])
            .build()
            .unwrap(),
    );

    game.add_text_item(
        TextItemBuilder::default()
            .text("test text")
            .pos((-1.0f32, 0.5f32, 0f32))
            .build()
            .unwrap(),
    );

    game.cams[0].pos.1 =
        2.5f32 + get_pos_perlin(((pseu_cam_pos.0 - fixed_val), (pseu_cam_pos.1 - fixed_val)));
    start_loop(event_loop, move |events| {
        let fps = game.renderer.fps;
        let mouse_pos = game.input.mouse_pos;
        let mouse_delta = game.input.mouse_delta;
        let (width, height, hidpi) = {
            let gl_window = game.renderer.display.gl_window();
            let window = gl_window.window();

            let (width, height): (u32, u32) = window.inner_size().into();
            let hidpi = window.scale_factor();

            (width, height, hidpi)
        };
        let debug_pseu_cam_pos = pseu_cam_pos;
        let debug_debug_mode = debug_mode;
        // run the engine update
        game.update(
            |ui: &Ui| {
                if debug_debug_mode {
                    Window::new(im_str!("debug"))
                        .size([300f32, 200f32], Condition::FirstUseEver)
                        .position([0f32, 0f32], Condition::FirstUseEver)
                        .build(&ui, || {
                            ui.text(im_str!("map_size: {}", map_size));
                            ui.text(im_str!("fixed_val: {}", fixed_val));
                            ui.separator();
                            ui.text(im_str!("move_speed: {}", move_speed));
                            ui.text(im_str!("mouse_speed: {}", mouse_speed));
                            ui.text(im_str!("mouse_pos: {:?}", mouse_pos));
                            ui.text(im_str!("mouse_delta: {:?}", mouse_delta));
                            ui.separator();
                            ui.text(im_str!("pseu_cam_pos: {:?}", debug_pseu_cam_pos));
                            ui.text(im_str!("fps: {:?}", fps));
                            ui.text(im_str!("px res: ({}, {})", width, height));
                            ui.text(im_str!("hidpi: {}", hidpi));
                            ui.checkbox(im_str!("test_check"), &mut test_check);
                        });
                }
            },
            |g: &mut Game<DefaultTag>| -> UpdateStatus {
                if g.input.hide_mouse {
                    let mv_matrix = caper::utils::build_fp_view_matrix(&g.cams[0]);

                    if g.input.keys_down.contains(&Key::S) {
                        pseu_cam_pos.0 += mv_matrix[0][2] * move_speed;
                        pseu_cam_pos.1 += mv_matrix[2][2] * move_speed;
                        movement_dirty = true;
                    }

                    if g.input.keys_down.contains(&Key::W) {
                        pseu_cam_pos.0 -= mv_matrix[0][2] * move_speed;
                        pseu_cam_pos.1 -= mv_matrix[2][2] * move_speed;
                        movement_dirty = true;
                    }

                    if g.input.keys_down.contains(&Key::D) {
                        pseu_cam_pos.0 += mv_matrix[0][0] * move_speed;
                        pseu_cam_pos.1 += mv_matrix[2][0] * move_speed;
                        movement_dirty = true;
                    }

                    if g.input.keys_down.contains(&Key::A) {
                        pseu_cam_pos.0 -= mv_matrix[0][0] * move_speed;
                        pseu_cam_pos.1 -= mv_matrix[2][0] * move_speed;
                        movement_dirty = true;
                    }

                    g.cams[0].euler_rot.0 += g.input.mouse_delta.1 * mouse_speed;
                    g.cams[0].euler_rot.1 += g.input.mouse_delta.0 * mouse_speed;
                }

                // only regenerate the mesh if movement
                if movement_dirty {
                    g.get_render_item(0).vertices = gen_perlin_mesh(pseu_cam_pos, map_size);
                    g.cams[0].pos.1 = 2.5f32
                        + get_pos_perlin((
                            (pseu_cam_pos.0 - fixed_val),
                            (pseu_cam_pos.1 - fixed_val),
                        ));

                    // update the sphere location
                    g.get_render_item(2).instance_transforms[0].pos = (
                        sphere_pos.0 - pseu_cam_pos.0,
                        3.0,
                        sphere_pos.1 - pseu_cam_pos.1,
                    );
                }

                // gif
                if g.input.keys_pressed.contains(&Key::O) {
                    g.renderer.save_add_to_gif("test.gif");
                }

                // screenshot
                if g.input.keys_pressed.contains(&Key::P) {
                    g.renderer.save_screenshot();
                }

                if g.input.keys_down.contains(&Key::LShift) {
                    if g.input.keys_down.contains(&Key::L) {
                        debug_mode = true;
                    }
                    if g.input.keys_down.contains(&Key::K) {
                        debug_mode = false;
                    }
                    g.input.hide_mouse = !g.input.keys_down.contains(&Key::M);
                }
                g.renderer.show_editor = debug_mode;

                // quit
                if g.input.keys_down.contains(&Key::Escape) {
                    return UpdateStatus::Finish;
                }

                UpdateStatus::Continue
            },
            events,
        )
    });
}