Update bunnymark, issue #480

examples/others/bunnymark/main.go

@@ -3,9 +3,13 @@ package main
 import (
 	"fmt"
 
-	"github.com/gen2brain/raylib-go/raylib"
+	rl "github.com/gen2brain/raylib-go/raylib"
 )
 
+// This is the maximum amount of elements (quads) per batch
+// NOTE: This value is defined in [rlgl] module and can be changed there
+const maxBatchElements = 8192
+
 // Bunny type
 type Bunny struct {
 	Position rl.Vector2
@@ -14,15 +18,14 @@ type Bunny struct {
 }
 
 func main() {
-	screenWidth := int32(1280)
+	screenWidth := int32(800)
-	screenHeight := int32(960)
+	screenHeight := int32(450)
 
-	rl.InitWindow(screenWidth, screenHeight, "raylib [core] example - Bunnymark")
+	rl.InitWindow(screenWidth, screenHeight, "raylib [others] example - bunnymark")
 
 	texture := rl.LoadTexture("wabbit_alpha.png")
 
 	bunnies := make([]*Bunny, 0)
-	bunniesCount := 0
 
 	rl.SetTargetFPS(60)
 
@@ -33,11 +36,11 @@ func main() {
 			for i := 0; i < 100; i++ {
 				b := &Bunny{}
 				b.Position = rl.GetMousePosition()
-				b.Speed.X = float32(rl.GetRandomValue(250, 500)) / 60.0
+				b.Speed.X = float32(rl.GetRandomValue(-250, 250)) / 60.0
-				b.Speed.Y = float32(rl.GetRandomValue(250, 500)-500) / 60.0
+				b.Speed.Y = float32(rl.GetRandomValue(-250, 250)) / 60.0
+				b.Color = rl.NewColor(uint8(rl.GetRandomValue(50, 240)), uint8(rl.GetRandomValue(80, 240)), uint8(rl.GetRandomValue(100, 240)), 255)
 
 				bunnies = append(bunnies, b)
-				bunniesCount++
 			}
 		}
 
@@ -46,11 +49,11 @@ func main() {
 			b.Position.X += b.Speed.X
 			b.Position.Y += b.Speed.Y
 
-			if (b.Position.X > float32(screenWidth)) || (b.Position.X < 0) {
+			if ((b.Position.X + float32(texture.Width/2)) > float32(screenWidth)) || ((b.Position.X + float32(texture.Width/2)) < 0) {
 				b.Speed.X *= -1
 			}
 
-			if (b.Position.Y > float32(screenHeight)) || (b.Position.Y < 0) {
+			if ((b.Position.Y + float32(texture.Height/2)) > float32(screenHeight)) || ((b.Position.Y + float32(texture.Height/2-40)) < 0) {
 				b.Speed.Y *= -1
 			}
 		}
@@ -60,18 +63,20 @@ func main() {
 		rl.ClearBackground(rl.RayWhite)
 
 		for _, b := range bunnies {
-			// NOTE: When internal QUADS batch limit is reached, a draw call is launched and
+			// NOTE: When internal batch buffer limit is reached (MAX_BATCH_ELEMENTS),
-			// batching buffer starts being filled again; before launching the draw call,
+			// a draw call is launched and buffer starts being filled again;
-			// updated vertex data from internal buffer is send to GPU... it seems it generates
+			// before issuing a draw call, updated vertex data from internal CPU buffer is send to GPU...
-			// a stall and consequently a frame drop, limiting number of bunnies drawn at 60 fps
+			// Process of sending data is costly and it could happen that GPU data has not been completely
-			rl.DrawTexture(texture, int32(b.Position.X), int32(b.Position.Y), rl.RayWhite)
+			// processed for drawing while new data is tried to be sent (updating current in-use buffers)
+			// it could generates a stall and consequently a frame drop, limiting the number of drawn bunnies
+			rl.DrawTexture(texture, int32(b.Position.X), int32(b.Position.Y), b.Color)
 		}
 
-		rl.DrawRectangle(0, 0, screenWidth, 40, rl.LightGray)
+		rl.DrawRectangle(0, 0, screenWidth, 40, rl.Black)
-		rl.DrawText("raylib bunnymark", 10, 10, 20, rl.DarkGray)
+		rl.DrawText(fmt.Sprintf("bunnies: %d", len(bunnies)), 120, 10, 20, rl.Green)
-		rl.DrawText(fmt.Sprintf("bunnies: %d", bunniesCount), 400, 10, 20, rl.Red)
+		rl.DrawText(fmt.Sprintf("batched draw calls: %d", 1+len(bunnies)/maxBatchElements), 320, 10, 20, rl.Maroon)
 
-		rl.DrawFPS(260, 10)
+		rl.DrawFPS(10, 10)
 
 		rl.EndDrawing()
 	}