draw optimizations

client/world/renderer_drawitems_reuse_bench_test.go

@@ -0,0 +1,53 @@
+package world
+
+import (
+	"image/color"
+	"testing"
+
+	"github.com/fogleman/gg"
+)
+
+func BenchmarkDrawPlanSinglePass_DrawItemsReuse(b *testing.B) {
+	w := NewWorld(600, 600)
+
+	// Make grid + index available.
+	w.IndexOnViewportChange(1000, 700, 1.0)
+
+	// Add enough objects so tiles have candidates.
+	for i := range 2000 {
+		_, _ = w.AddPoint(float64(i%600), float64((i*7)%600))
+	}
+	for i := range 500 {
+		_, _ = w.AddCircle(float64((i*11)%600), float64((i*13)%600), 5.0)
+	}
+	w.Reindex()
+
+	params := RenderParams{
+		ViewportWidthPx:  1000,
+		ViewportHeightPx: 700,
+		MarginXPx:        250,
+		MarginYPx:        175,
+		CameraXWorldFp:   300 * SCALE,
+		CameraYWorldFp:   300 * SCALE,
+		CameraZoom:       1.0,
+		Options: &RenderOptions{
+			BackgroundColor: color.RGBA{A: 255},
+		},
+	}
+
+	plan, err := w.buildRenderPlanStageA(params)
+	if err != nil {
+		b.Fatalf("build plan: %v", err)
+	}
+
+	dc := gg.NewContext(params.CanvasWidthPx(), params.CanvasHeightPx())
+	drawer := &GGDrawer{DC: dc}
+
+	b.ReportAllocs()
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		// We don't clear here; we only measure the draw loop overhead.
+		w.drawPlanSinglePass(drawer, plan, true, drawPlanSinglePassClipEnabled, false)
+	}
+}