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

Examples/Core/SmoothPixelperfect.cs

@@ -0,0 +1,136 @@
+/*******************************************************************************************
+*
+*   raylib [core] example - smooth pixel-perfect camera
+*
+*   This example has been created using raylib 3.7 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Example contributed by Giancamillo Alessandroni (@NotManyIdeasDev) and
+*   reviewed by Ramon Santamaria (@raysan5)
+*
+*   Copyright (c) 2021 Giancamillo Alessandroni (@NotManyIdeasDev) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System;
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Core;
+
+public static class SmoothPixelPerfect
+{
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        const int screenWidth = 800;
+        const int screenHeight = 450;
+
+        const int virtualScreenWidth = 160;
+        const int virtualScreenHeight = 90;
+
+        const float virtualRatio = (float)screenWidth / (float)virtualScreenWidth;
+
+        InitWindow(screenWidth, screenHeight, "raylib [core] example - smooth pixel-perfect camera");
+
+        // Game world camera
+        Camera2D worldSpaceCamera = new();
+        worldSpaceCamera.Zoom = 1.0f;
+
+        // Smoothing camera
+        Camera2D screenSpaceCamera = new();
+        screenSpaceCamera.Zoom = 1.0f;
+
+        // This is where we'll draw all our objects.
+        RenderTexture2D target = LoadRenderTexture(virtualScreenWidth, virtualScreenHeight);
+
+        Rectangle rec01 = new(70.0f, 35.0f, 20.0f, 20.0f);
+        Rectangle rec02 = new(90.0f, 55.0f, 30.0f, 10.0f);
+        Rectangle rec03 = new(80.0f, 65.0f, 15.0f, 25.0f);
+
+        // The target's height is flipped (in the source Rectangle), due to OpenGL reasons
+        Rectangle sourceRec = new(
+            0.0f,
+            0.0f,
+            (float)target.Texture.Width,
+            -(float)target.Texture.Height
+        );
+        Rectangle destRec = new(
+            -virtualRatio,
+            -virtualRatio,
+            screenWidth + (virtualRatio * 2),
+            screenHeight + (virtualRatio * 2)
+        );
+
+        Vector2 origin = new(0.0f, 0.0f);
+
+        float rotation = 0.0f;
+
+        float cameraX = 0.0f;
+        float cameraY = 0.0f;
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        // Main game loop
+        while (!WindowShouldClose())
+        {
+            // Update
+            //----------------------------------------------------------------------------------
+            rotation += 60.0f * GetFrameTime();   // Rotate the rectangles, 60 degrees per second
+
+            // Make the camera move to demonstrate the effect
+            cameraX = (MathF.Sin((float)GetTime()) * 50.0f) - 10.0f;
+            cameraY = MathF.Cos((float)GetTime()) * 30.0f;
+
+            // Set the camera's target to the values computed above
+            screenSpaceCamera.Target = new Vector2(cameraX, cameraY);
+
+            // Round worldSpace coordinates, keep decimals into screenSpace coordinates
+            worldSpaceCamera.Target.X = (int)screenSpaceCamera.Target.X;
+            screenSpaceCamera.Target.X -= worldSpaceCamera.Target.X;
+            screenSpaceCamera.Target.X *= virtualRatio;
+
+            worldSpaceCamera.Target.Y = (int)screenSpaceCamera.Target.Y;
+            screenSpaceCamera.Target.Y -= worldSpaceCamera.Target.Y;
+            screenSpaceCamera.Target.Y *= virtualRatio;
+            //----------------------------------------------------------------------------------
+
+            // Draw
+            //----------------------------------------------------------------------------------
+            BeginTextureMode(target);
+            ClearBackground(Color.RAYWHITE);
+
+            BeginMode2D(worldSpaceCamera);
+            DrawRectanglePro(rec01, origin, rotation, Color.BLACK);
+            DrawRectanglePro(rec02, origin, -rotation, Color.RED);
+            DrawRectanglePro(rec03, origin, rotation + 45.0f, Color.BLUE);
+            EndMode2D();
+
+            EndTextureMode();
+
+            BeginDrawing();
+            ClearBackground(Color.RED);
+
+            BeginMode2D(screenSpaceCamera);
+            DrawTexturePro(target.Texture, sourceRec, destRec, origin, 0.0f, Color.WHITE);
+            EndMode2D();
+
+            DrawText($"Screen resolution: {screenWidth}x{screenHeight}", 10, 10, 20, Color.DARKBLUE);
+            DrawText($"World resolution: {virtualScreenWidth}x{virtualScreenHeight}", 10, 40, 20, Color.DARKGREEN);
+            DrawFPS(GetScreenWidth() - 95, 10);
+            EndDrawing();
+            //----------------------------------------------------------------------------------
+        }
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        UnloadRenderTexture(target);
+
+        CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}