Update/merge examples back into main repo (#192)

Examples/Textures/Bunnymark.cs

@@ -0,0 +1,133 @@
+/*******************************************************************************************
+*
+*   raylib [textures] example - Bunnymark
+*
+*   This example has been created using raylib 1.6 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2014-2019 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Textures;
+
+public class Bunnymark
+{
+    public const int MaxBunnies = 150000;
+
+    // This is the maximum amount of elements (quads) per batch
+    // NOTE: This value is defined in [rlgl] module and can be changed there
+    public const int MAX_BATCH_ELEMENTS = 8192;
+
+    struct Bunny
+    {
+        public Vector2 Position;
+        public Vector2 Speed;
+        public Color Color;
+    }
+
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        const int screenWidth = 800;
+        const int screenHeight = 450;
+
+        InitWindow(screenWidth, screenHeight, "raylib [textures] example - bunnymark");
+
+        // Load bunny texture
+        Texture2D texBunny = LoadTexture("resources/wabbit_alpha.png");
+
+        // 50K bunnies limit
+        Bunny[] bunnies = new Bunny[MaxBunnies];
+        int bunniesCount = 0;
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        // Main game loop
+        while (!WindowShouldClose())
+        {
+            // Update
+            //----------------------------------------------------------------------------------
+            if (IsMouseButtonDown(MouseButton.MOUSE_LEFT_BUTTON))
+            {
+                // Create more bunnies
+                for (int i = 0; i < 100; i++)
+                {
+                    if (bunniesCount < MaxBunnies)
+                    {
+                        bunnies[bunniesCount].Position = GetMousePosition();
+                        bunnies[bunniesCount].Speed.X = (float)GetRandomValue(-250, 250) / 60.0f;
+                        bunnies[bunniesCount].Speed.Y = (float)GetRandomValue(-250, 250) / 60.0f;
+                        bunnies[bunniesCount].Color = new Color(
+                            GetRandomValue(50, 240),
+                            GetRandomValue(80, 240),
+                            GetRandomValue(100, 240), 255
+                        );
+                        bunniesCount++;
+                    }
+                }
+            }
+
+            // Update bunnies
+            Vector2 screen = new(GetScreenWidth(), GetScreenHeight());
+            Vector2 halfSize = new Vector2(texBunny.Width, texBunny.Height) / 2;
+
+            for (int i = 0; i < bunniesCount; i++)
+            {
+                bunnies[i].Position += bunnies[i].Speed;
+
+                if (((bunnies[i].Position.X + halfSize.X) > screen.X) ||
+                    ((bunnies[i].Position.X + halfSize.X) < 0))
+                {
+                    bunnies[i].Speed.X *= -1;
+                }
+
+                if (((bunnies[i].Position.Y + halfSize.Y) > screen.Y) ||
+                    ((bunnies[i].Position.Y + halfSize.Y - 40) < 0))
+                {
+                    bunnies[i].Speed.Y *= -1;
+                }
+            }
+            //----------------------------------------------------------------------------------
+
+            // Draw
+            //----------------------------------------------------------------------------------
+            BeginDrawing();
+            ClearBackground(Color.RAYWHITE);
+
+            for (int i = 0; i < bunniesCount; i++)
+            {
+                // NOTE: When internal batch buffer limit is reached (MAX_BATCH_ELEMENTS),
+                // a draw call is launched and buffer starts being filled again;
+                // before issuing a draw call, updated vertex data from internal CPU buffer is send to GPU...
+                // Process of sending data is costly and it could happen that GPU data has not been completely
+                // 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
+                DrawTexture(texBunny, (int)bunnies[i].Position.X, (int)bunnies[i].Position.Y, bunnies[i].Color);
+            }
+
+            DrawRectangle(0, 0, screenWidth, 40, Color.BLACK);
+            DrawText($"bunnies: {bunniesCount}", 120, 10, 20, Color.GREEN);
+            DrawText($"batched draw calls: {1 + bunniesCount / MAX_BATCH_ELEMENTS}", 320, 10, 20, Color.MAROON);
+
+            DrawFPS(10, 10);
+
+            EndDrawing();
+            //----------------------------------------------------------------------------------
+        }
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        UnloadTexture(texBunny);
+
+        CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}