a-game

commit 41cb2b17212684ba86d8199409793903cb5e9594
parent 046a2e5bd704e91fb1f1d65ef927845991a5d057
Author: Amin Mesbah <dev@aminmesbah.com>
Date:   Mon,  1 Jul 2019 17:17:47 -0700

Take actual dt into account

Diffstat:
M
src/platform_wasm.c
 | 
8
++++----
M
src/platform_wasm_loader.js
 | 
3
++-

2 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/src/platform_wasm.c b/src/platform_wasm.c
@@ -32,7 +32,7 @@ global_variable i32 g_height = PLATFORM_SCR_HEIGHT;
 // TODO: replace with allocator
 global_variable char g_mem_buffer[1000] = {0};
 global_variable i32 g_mem_buffer_i = 0;
-global_variable u32 time = 0;
+global_variable u32 previous_time = 0;
 
 i32 str_length(const char *str)
 {
@@ -72,10 +72,10 @@ bool init(i32 num_wasm_memory_pages)
     return init_successful;
 }
 
-void render(void)
+void render(f64 current_time)
 {
-    // TODO: measure dt
-    game_input.dt = 16;
+    game_input.dt = current_time - previous_time;
+    previous_time = current_time;
     game_update_and_render(&game_memory, &game_input, (v2u) {g_width, g_height});
 }
 
diff --git a/src/platform_wasm_loader.js b/src/platform_wasm_loader.js
@@ -218,7 +218,8 @@ function canvas_resize() {
     console.log("resize: (" + w_pixels + ", " + h_pixels + ")");
 }
 function canvas_render() {
-    exports['render']();
+    let timestamp_in_ms = performance.now();
+    exports['render'](timestamp_in_ms);
     window.requestAnimationFrame(canvas_render);
 }
 function file_load(name) {