Subtextures

GlitchyEngine/src/Renderer/SubTexture.bf

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+using GlitchyEngine.Core;
+using GlitchyEngine.Math;
+
+namespace GlitchyEngine.Renderer
+{
+	class SubTexture2D : RefCounter
+	{
+		protected Texture2D _texture ~ _.ReleaseRef();
+		protected Vector4 _texCoords;
+
+		public Texture2D Texture => _texture;
+		public Vector4 TexCoords => _texCoords;
+		
+		public this(Texture2D texture) : this(_texture, .(0, 0, 1, 1)) {  }
+
+		public this(Texture2D texture, Int2 topLeft, Int2 size) :
+			this(texture,
+			{
+				Vector2 texSize = Vector2(texture.Width, texture.Height);
+				Vector4 texCoords = Vector4((Vector2)topLeft, (Vector2)size) / texSize.XYXY;
+				texCoords
+			}) { }
+
+		public this(Texture2D texture, Vector2 topLeft, Vector2 size) : this(texture, Vector4(topLeft, size)) {  }
+
+		public this(Texture2D texture, Vector4 texCoords)
+		{
+			_texture = texture..AddRef();
+			_texCoords = texCoords;
+		}
+
+		public static SubTexture2D CreateFromGrid(Texture2D texture, Vector2 coords, Vector2 gridSize, Vector2 spriteSize = .One)
+		{
+			Vector2 textureSize = .(texture.Width, texture.Height);
+
+			Vector4 uv = .(coords * gridSize, gridSize * spriteSize) / textureSize.XYXY;
+
+			return new SubTexture2D(texture, uv);
+		}
+	}
+}