Mask for base layer

Sources/arm/node/MakeMesh.hx

@@ -183,6 +183,15 @@ class MakeMesh {
 					frag.write('metallic = 0.0;');
 				}
 
+				if (l.texpaint_mask != null) {
+					frag.add_shared_sampler('sampler2D texpaint_mask');
+					frag.write('float maskTexture = textureLodShared(texpaint_mask, texCoord, 0.0).r;');
+					frag.write('basecol *= maskTexture;');
+					frag.write('occlusion *= maskTexture;');
+					frag.write('roughness *= maskTexture;');
+					frag.write('metallic *= maskTexture;');
+				}
+
 				if (l.maskOpacity < 1) {
 					frag.write('basecol *= ${l.maskOpacity};');
 					frag.write('occlusion *= ${l.maskOpacity};');

Sources/arm/render/RenderPathPaint.hx

@@ -508,6 +508,9 @@ class RenderPathPaint {
 		path.bindTarget("texpaint" + tid, "texpaint");
 		path.bindTarget("texpaint_nor" + tid, "texpaint_nor");
 		path.bindTarget("texpaint_pack" + tid, "texpaint_pack");
+		if (Project.layers[0].texpaint_mask != null) {
+			path.bindTarget("texpaint_mask" + tid, "texpaint_mask");
+		}
 		for (i in 1...Project.layers.length) {
 			var l = Project.layers[i];
 			tid = l.id;

Sources/arm/render/Uniforms.hx

@@ -330,7 +330,6 @@ class Uniforms {
 		}
 		if (link.startsWith("_texpaint_mask")) {
 			var tid = Std.parseInt(link.substr(link.length - 1));
-			trace(tid);
 			return Project.layers[tid].texpaint_mask;
 		}
 		if (link.startsWith("_texpaint_nor")) {