log fps every 64 frames

1 files changed, 18 insertions, 5 deletions

diff --git a/src/main.zig b/src/main.zig
index aeae96e..6d70a14 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -117,6 +117,7 @@ pub fn main() !void {
     const control = try ctrl.ControlServer.init(cfg_allocator, progress, &cache, &config, &constants);
     defer control.destroy();
 
+    var loops: u8 = 0;
     while (c.glfwWindowShouldClose(window) == c.GL_FALSE) {
         c.glfwMakeContextCurrent(window);
 
@@ -134,12 +135,24 @@ pub fn main() !void {
         //     control.reload_requested = false;
         // }
 
-        fbo.bind();
-        c.glClear(c.GL_COLOR_BUFFER_BIT);
+        {
+            c.glFinish();
+            var timer = try std.time.Timer.start();
 
-        main_program.bind();
-        constants.normalized_quad.draw();
-        fbo.unbind();
+            fbo.bind();
+            c.glClear(c.GL_COLOR_BUFFER_BIT);
+
+            main_program.bind();
+            constants.normalized_quad.draw();
+            fbo.unbind();
+
+            c.glFinish();
+            const fps = timer.read(); // ns
+            loops = (loops + 1) % 64;
+            if (loops == 0) {
+                std.debug.print("\rrendered in {d:.2}ms\n", .{@as(f64, @floatFromInt(fps)) / std.time.ns_per_ms});
+            }
+        }
 
         for (outputs.items, 0..) |output, i| {
             const close = output.update(fbo.texture_id);