86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
package main
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import (
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"fmt"
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rl "github.com/gen2brain/raylib-go/raylib"
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)
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// This is the maximum amount of elements (quads) per batch
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// NOTE: This value is defined in [rlgl] module and can be changed there
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const maxBatchElements = 8192
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// Bunny type
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type Bunny struct {
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Position rl.Vector2
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Speed rl.Vector2
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Color rl.Color
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}
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func main() {
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screenWidth := int32(800)
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screenHeight := int32(450)
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rl.InitWindow(screenWidth, screenHeight, "raylib [others] example - bunnymark")
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texture := rl.LoadTexture("wabbit_alpha.png")
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bunnies := make([]*Bunny, 0)
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rl.SetTargetFPS(60)
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for !rl.WindowShouldClose() {
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if rl.IsMouseButtonDown(rl.MouseLeftButton) {
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// Create more bunnies
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for i := 0; i < 100; i++ {
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b := &Bunny{}
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b.Position = rl.GetMousePosition()
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b.Speed.X = float32(rl.GetRandomValue(-250, 250)) / 60.0
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b.Speed.Y = float32(rl.GetRandomValue(-250, 250)) / 60.0
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b.Color = rl.NewColor(uint8(rl.GetRandomValue(50, 240)), uint8(rl.GetRandomValue(80, 240)), uint8(rl.GetRandomValue(100, 240)), 255)
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bunnies = append(bunnies, b)
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}
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}
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// Update bunnies
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for _, b := range bunnies {
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b.Position.X += b.Speed.X
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b.Position.Y += b.Speed.Y
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if ((b.Position.X + float32(texture.Width/2)) > float32(screenWidth)) || ((b.Position.X + float32(texture.Width/2)) < 0) {
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b.Speed.X *= -1
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}
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if ((b.Position.Y + float32(texture.Height/2)) > float32(screenHeight)) || ((b.Position.Y + float32(texture.Height/2-40)) < 0) {
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b.Speed.Y *= -1
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}
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}
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rl.BeginDrawing()
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rl.ClearBackground(rl.RayWhite)
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for _, b := range bunnies {
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// NOTE: When internal batch buffer limit is reached (MAX_BATCH_ELEMENTS),
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// a draw call is launched and buffer starts being filled again;
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// before issuing a draw call, updated vertex data from internal CPU buffer is send to GPU...
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// Process of sending data is costly and it could happen that GPU data has not been completely
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// processed for drawing while new data is tried to be sent (updating current in-use buffers)
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// it could generates a stall and consequently a frame drop, limiting the number of drawn bunnies
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rl.DrawTexture(texture, int32(b.Position.X), int32(b.Position.Y), b.Color)
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}
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rl.DrawRectangle(0, 0, screenWidth, 40, rl.Black)
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rl.DrawText(fmt.Sprintf("bunnies: %d", len(bunnies)), 120, 10, 20, rl.Green)
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rl.DrawText(fmt.Sprintf("batched draw calls: %d", 1+len(bunnies)/maxBatchElements), 320, 10, 20, rl.Maroon)
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rl.DrawFPS(10, 10)
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rl.EndDrawing()
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}
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rl.UnloadTexture(texture)
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rl.CloseWindow()
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}
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