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const std = @import("std");
const sdl = @import("sdl2");
const Self = @This();
const Config = struct {
const RenderMode = enum {
Pixel,
PixelPerfect,
Hd,
};
width: usize,
height: usize,
scale: usize = 1,
target_fps: ?u31,
show_cursor: bool = false,
render: RenderMode = .Pixel,
title: [:0]const u8 = "ZXC",
};
config: Config,
window: sdl.Window,
renderer: sdl.Renderer,
target: ?sdl.Texture,
min_dt: u64,
next_time: u64,
tick: u64,
pub fn init(config: Config) !Self {
var self = Self{
.config = config,
.window = undefined,
.renderer = undefined,
.target = null,
.min_dt = undefined,
.next_time = undefined,
.tick = 0,
};
try sdl.init(.{ .video = true });
errdefer sdl.quit();
const basepath = sdl.c.SDL_GetBasePath();
if (basepath == null)
return sdl.makeError();
defer sdl.c.SDL_free(basepath);
try std.os.chdir(std.mem.span(basepath));
self.window = try sdl.createWindow(
config.title,
sdl.WindowPosition.default,
sdl.WindowPosition.default,
config.width,
config.height,
.{ .resizable = true },
);
errdefer self.window.destroy();
self.renderer = try sdl.createRenderer(
self.window,
null,
sdl.RendererFlags{ .accelerated = true },
);
errdefer self.renderer.destroy();
try self.renderer.setDrawBlendMode(.blend);
if (config.render != .Hd) {
self.target = try sdl.createTexture(
self.renderer,
.rgb888,
.target,
config.width,
config.height,
);
}
errdefer if (self.target != null) self.target.?.destroy();
if (!config.show_cursor)
_ = try sdl.showCursor(false);
_ = sdl.setHint(
sdl.hint.render_scale_quality,
if (config.render == .Hd) "1" else "0",
);
if (config.target_fps != null) {
self.min_dt = 1000 / config.target_fps.?;
self.next_time = sdl.getTicks64();
}
return self;
}
pub fn deinit(self: *const Self) void {
if (self.target != null)
self.target.?.destroy();
self.renderer.destroy();
self.window.destroy();
sdl.quit();
}
pub fn drawBegin(self: *const Self) !void {
if (self.config.render == .Hd)
return;
try self.renderer.setTarget(self.target);
}
pub fn drawEnd(self: *Self) !void {
if (self.config.render != .Hd) {
try self.renderer.setTarget(null);
try self.renderer.setColorRGBA(0, 0, 0, 255);
try self.renderer.clear();
const size = self.window.getSize();
const scw = @intToFloat(f64, self.config.width);
const sch = @intToFloat(f64, self.config.height);
const scale = brk: {
const ratio_w = @intToFloat(f64, size.width) / scw;
const ratio_h = @intToFloat(f64, size.height) / sch;
const ratio = if (ratio_w < ratio_h) ratio_w else ratio_h;
break :brk if (ratio > 1) std.math.floor(ratio) else ratio;
};
const dst_rect = sdl.Rectangle{
.x = size.width - @floatToInt(c_int, scw * scale),
.y = size.height - @floatToInt(c_int, sch * scale),
.width = @floatToInt(c_int, scw * scale),
.height = @floatToInt(c_int, sch * scale),
};
try self.renderer.copy(self.target.?, dst_rect, null);
}
if (self.config.target_fps != null) {
self.next_time += self.min_dt;
const cur_time = sdl.getTicks64();
if (self.next_time <= cur_time)
self.next_time = cur_time
else
sdl.delay(@truncate(u32, self.next_time - cur_time));
}
self.renderer.present();
self.tick += 1;
}
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