Added timers to the game

src/main.zig

@@ -8,6 +8,7 @@ const SCREEN_HEIGHT = 480;
 const log = sdl.SDL_Log;
 const GameText = @import("./text.zig").GameText;
 const RGBAColor = @import("./utils/rgb_color.zig").RGBAColor;
+const Timer = @import("./utils/timer.zig").Timer;
 
 var window: *sdl.struct_SDL_Window = undefined;
 // var screen_surface: *sdl.struct_SDL_Surface = undefined;
@@ -41,6 +42,8 @@ pub fn main() !void {
 
     var quit = false;
     var shifted = false;
+    var start_time: u32 = 0;
+    var timer = Timer{};
     while (!quit) {
         var event: sdl.SDL_Event = undefined;
         while (sdl.SDL_PollEvent(&event) != 0) {
@@ -58,17 +61,14 @@ pub fn main() !void {
                 },
                 sdl.SDL_KEYDOWN => {
                     switch (event.key.keysym.sym) {
-                        sdl.SDLK_r => {
-                            game_state.r = if (shifted) game_state.r - 5 else game_state.r + 5;
+                        sdl.SDLK_RETURN => {
+                            start_time = sdl.SDL_GetTicks();
                         },
-                        sdl.SDLK_g => {
-                            game_state.g = if (shifted) game_state.g - 5 else game_state.g + 5;
+                        sdl.SDLK_s => {
+                            if (timer.status == .started) timer.stop() else timer.start();
                         },
-                        sdl.SDLK_b => {
-                            game_state.b = if (shifted) game_state.b - 5 else game_state.b + 5;
-                        },
-                        sdl.SDLK_LSHIFT => {
-                            shifted = true;
+                        sdl.SDLK_p => {
+                            if (timer.status == .paused) timer.unpause() else timer.pause();
                         },
                         // sdl.SDLK_UP => {
                         //     img_pos.y = img_pos.y - 5;
@@ -93,8 +93,26 @@ pub fn main() !void {
         _ = sdl.SDL_RenderClear(renderer);
         _ = sdl.SDL_RenderCopy(renderer, bg_texture, null, null);
         game_state.update_tick();
-        var text = try GameText.loadFromRenderedText("Test 123", RGBAColor.whiteSmoke().tosdl());
-        try text.render(&game_state);
+        var text = try GameText.loadFromRenderedText("Press S to start / stop", RGBAColor.whiteSmoke().tosdl());
+        try text.render(
+            &game_state,
+            .{ .x = @intCast(game_state.SCREEN_WIDTH - text.w), .y = 2 },
+        );
+        text = try GameText.loadFromRenderedText("Press P to pause / unpause", RGBAColor.whiteSmoke().tosdl());
+        try text.render(
+            &game_state,
+            .{ .x = @intCast(game_state.SCREEN_WIDTH - text.w), .y = 24 },
+        );
+
+        var buf: [8]u8 = undefined;
+        const timer_ms = timer.getTicks();
+        // const timer_base = std.math.log10(timer_ms) + 3;
+        const time_str: []const u8 = try std.fmt.bufPrint(&buf, "{d}ms", .{timer_ms});
+        var time_text = try GameText.loadFromRenderedText(time_str, RGBAColor.whiteSmoke().tosdl());
+        try time_text.render(
+            &game_state,
+            .{ .x = @intCast(game_state.SCREEN_WIDTH - time_text.w), .y = 64 },
+        );
 
         // Render red rect
         // const fill_rect: sdl.struct_SDL_Rect = sdl.SDL_Rect{ .x = SCREEN_WIDTH / 4, .y = SCREEN_HEIGHT / 4, .w = SCREEN_WIDTH / 2 + img_pos.x, .h = SCREEN_HEIGHT / 2 + img_pos.y };