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