87 lines
2.1 KiB
Zig
87 lines
2.1 KiB
Zig
const gfx = @import("gfx");
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const ona = @import("ona");
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const std = @import("std");
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const CRT = extern struct {
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width: f32,
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height: f32,
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time: f32,
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padding: [4]u8 = undefined,
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};
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const Effects = struct {
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render_texture: gfx.Texture = .default,
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crt_effect: gfx.Effect = .default,
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};
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fn load(display: ona.Write(gfx.Display), actors: ona.Write(Effects), assets: ona.Write(gfx.Assets)) !void {
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display.state.width, display.state.height = .{1280, 720};
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actors.state.render_texture = try assets.state.load_texture(.{
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.format = .rgba8,
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.access = .{
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.render = .{
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.width = display.state.width,
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.height = display.state.height,
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},
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},
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});
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actors.state.crt_effect = try assets.state.load_effect_file(ona.files.bundle, "./crt.frag.spv");
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}
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pub const main = ona.App.setup.
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with_module(gfx).
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with_state(Effects{}).
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with_system(.load, ona.system_fn(load), .{.label = "load effects"}).
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with_system(.render, ona.system_fn(render), .{.label = "render effects"}).build();
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fn render(commands: gfx.Commands, effects: ona.Write(Effects), app: ona.Read(ona.App), display: ona.Write(gfx.Display)) !void {
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try commands.set_target(.{
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.texture = effects.state.render_texture,
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.clear_color = gfx.colors.black,
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.clear_depth = 0,
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.clear_stencil = 0,
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});
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const display_width: f32 = @floatFromInt(display.state.width);
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const display_height: f32 = @floatFromInt(display.state.height);
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const display_transform = gfx.Transform2D{
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.origin = .{display_width / 2, display_height / 2},
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.xbasis = .{display_width, 0},
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.ybasis = .{0, display_height},
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};
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try commands.draw_texture(.{
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.texture = .default,
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.transform = display_transform,
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});
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try commands.set_effect(.{
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.effect = effects.state.crt_effect,
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.properties = std.mem.asBytes(&CRT{
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.width = display_width,
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.height = display_height,
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.time = @floatCast(app.state.elapsed_time),
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}),
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});
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try commands.set_target(.{
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.texture = .backbuffer,
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.clear_color = null,
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.clear_depth = null,
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.clear_stencil = null,
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});
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try commands.draw_texture(.{
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.texture = effects.state.render_texture,
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.transform = display_transform,
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});
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}
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