refactor debug info, measure render times

internal/io/io.go

@@ -1,6 +1,10 @@
 package io
 
-import "edgaru089.ml/go/gl01/internal/util/itype"
+import (
+	"time"
+
+	"edgaru089.ml/go/gl01/internal/util/itype"
+)
 
 var (
 	DisplaySize itype.Vec2i // Size of the window viewport in pixels.
@@ -13,4 +17,19 @@ var (
 	RenderPos, RenderDir itype.Vec3d // Position and Direction of view for the current render pass. Might be different for e.g. lighting passes
 
 	ShowDebugInfo bool // Show debug info (F3 screen)?
+
+	// Per-Frame Diagnostics information
+	Diagnostics struct {
+		CgoCalls int64    // Cgo calls in the last frame
+		Times    struct { // Times spent
+			GUI, Logic, Render time.Duration
+			RenderPasses       struct {
+				Depthmap,
+				Geometry,
+				SSAO,
+				Lighting,
+				Postfx time.Duration
+			}
+		}
+	}
 )