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// Copyright(C) 2019 Lars Pontoppidan. All rights reserved.
// Use of this source code is governed by an MIT license file distributed with this software package
module main
import time
import sokol
import sokol.sapp
import sokol.gfx
import sokol.sgl
import particle
const (
used_import = sokol.used_import
)
fn main() {
mut app := &App{
width: 800
height: 400
pass_action: gfx.create_clear_pass(0.1, 0.1, 0.1, 1.0)
}
app.init()
app.run()
}
struct App {
pass_action C.sg_pass_action
mut:
width int
height int
frame i64
last i64
ps particle.System
alpha_pip C.sgl_pipeline
}
fn (mut a App) init() {
a.frame = 0
a.last = time.ticks()
a.ps = particle.System{
width: a.width
height: a.height
}
a.ps.init(particle.SystemConfig{
pool: 20000
})
}
fn (mut a App) cleanup() {
a.ps.free()
}
fn (mut a App) run() {
title := 'V Particle Example'
desc := C.sapp_desc{
width: a.width
height: a.height
user_data: a
init_userdata_cb: init
frame_userdata_cb: frame
event_userdata_cb: event
window_title: title.str
html5_canvas_name: title.str
cleanup_userdata_cb: cleanup
}
sapp.run(&desc)
}
fn (a App) draw() {
sgl.load_pipeline(a.alpha_pip)
a.ps.draw()
}
fn init(user_data voidptr) {
mut app := &App(user_data)
desc := sapp.create_desc()
gfx.setup(&desc)
sgl_desc := C.sgl_desc_t{
max_vertices: 50 * 65536
}
sgl.setup(&sgl_desc)
mut pipdesc := C.sg_pipeline_desc{}
unsafe { C.memset(&pipdesc, 0, sizeof(pipdesc)) }
color_state := C.sg_color_state{
blend: C.sg_blend_state{
enabled: true
src_factor_rgb: gfx.BlendFactor(C.SG_BLENDFACTOR_SRC_ALPHA)
dst_factor_rgb: gfx.BlendFactor(C.SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA)
}
}
pipdesc.colors[0] = color_state
app.alpha_pip = sgl.make_pipeline(&pipdesc)
}
fn cleanup(user_data voidptr) {
mut app := &App(user_data)
app.cleanup()
gfx.shutdown()
}
fn frame(user_data voidptr) {
mut app := &App(user_data)
app.width = sapp.width()
app.height = sapp.height()
t := time.ticks()
dt := f64(t - app.last) / 1000.0
app.ps.update(dt)
draw(app)
gfx.begin_default_pass(&app.pass_action, app.width, app.height)
sgl.default_pipeline()
sgl.draw()
gfx.end_pass()
gfx.commit()
app.frame++
app.last = t
}
fn event(ev &C.sapp_event, mut app App) {
if ev.@type == .mouse_move {
app.ps.explode(ev.mouse_x, ev.mouse_y)
}
if ev.@type == .mouse_up || ev.@type == .mouse_down {
if ev.mouse_button == .left {
is_pressed := ev.@type == .mouse_down
if is_pressed {
app.ps.explode(ev.mouse_x, ev.mouse_y)
}
}
}
if ev.@type == .key_up || ev.@type == .key_down {
if ev.key_code == .r {
is_pressed := ev.@type == .key_down
if is_pressed {
app.ps.reset()
}
}
}
if ev.@type == .touches_began || ev.@type == .touches_moved {
if ev.num_touches > 0 {
touch_point := ev.touches[0]
app.ps.explode(touch_point.pos_x, touch_point.pos_y)
}
}
}
fn draw(a &App) {
sgl.defaults()
sgl.matrix_mode_projection()
sgl.ortho(0, f32(sapp.width()), f32(sapp.height()), 0.0, -1.0, 1.0)
sgl.push_matrix()
a.draw()
sgl.pop_matrix()
}
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