From 110e85827e557a4bb2424eee927cd5a902ed930d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petar=20Kapri=C5=A1?= <petarkapris@firemail.cc>
Date: Tue, 20 Dec 2022 14:57:38 +0100
Subject: [PATCH] Add diffuseImage Material

---
 src/xyz/marsavic/gfxlab/graphics3d/Material.java | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/xyz/marsavic/gfxlab/graphics3d/Material.java b/src/xyz/marsavic/gfxlab/graphics3d/Material.java
index ed3adb1..65bd52d 100644
--- a/src/xyz/marsavic/gfxlab/graphics3d/Material.java
+++ b/src/xyz/marsavic/gfxlab/graphics3d/Material.java
@@ -1,10 +1,26 @@
 package xyz.marsavic.gfxlab.graphics3d;
 
+import xyz.marsavic.geometry.Vector;
 import xyz.marsavic.gfxlab.Color;
 
+import java.awt.image.BufferedImage;
+
 public record Material(
 		Color diffuse
 ) {
+	public static Material diffuseImage(BufferedImage img, Vector uv) {
+		int x = (int) (uv.x()*img.getWidth()) % img.getWidth();
+		if (x < 0) {
+			x += img.getWidth(); // adding in case of negative modulo
+		}
+
+		int y = (int) (uv.y()*img.getWidth()) % img.getWidth();
+		if (y < 0) {
+			y += img.getHeight();
+		}
+		y = img.getHeight()-y-1; // inverting y, BufferedImage is encoded from top to bottom, and uv mapping is bottom to top
+		return new Material(Color.code(img.getRGB(x, y)));
+	}
 	public Material diffuse(Color diffuse) { return new Material(diffuse); }
 	
 	public static final Material BLACK   = new Material(Color.BLACK);