Mirror paint

Sources/arm/UINodes.hx

@@ -515,7 +515,16 @@ class UINodes extends iron.Trait {
 				frag.write('vec2 pa = bsp.xy - binp.xy, ba = binplast.xy - binp.xy;');
 				frag.write('float h = clamp(dot(pa, ba) / dot(ba, ba), 0.0, 1.0);');
 				frag.write('float dist = length(pa - ba * h);');
-				frag.write('if (dist > brushRadius) { discard; return; }');
+				if (!UITrait.inst.mirrorX) {
+					frag.write('if (dist > brushRadius) { discard; return; }');
+				}
+				else {
+					frag.write('vec2 binp2 = vec2(0.5 - (binp.x - 0.5), binp.y), binplast2 = vec2(0.5 - (binplast.x - 0.5), binplast.y);');
+					frag.write('vec2 pa2 = bsp.xy - binp2.xy, ba2 = binplast2.xy - binp2.xy;');
+					frag.write('float h2 = clamp(dot(pa2, ba2) / dot(ba2, ba2), 0.0, 1.0);');
+					frag.write('float dist2 = length(pa2 - ba2 * h2);');
+					frag.write('if (dist > brushRadius && dist2 > brushRadius) { discard; return; }');
+				}
 				//
 
 				// frag.write('float dist = distance(bsp.xy, binp.xy);');
@@ -592,6 +601,11 @@ class UINodes extends iron.Trait {
 		if (eraser) frag.write('    float str = 1.0 - brushOpacity;');
 		else frag.write('    float str = clamp(brushOpacity * (brushRadius - dist) * brushStrength, 0.0, 1.0);');
 
+		if (UITrait.inst.mirrorX && !eraser) {
+			frag.write('str += clamp(brushOpacity * (brushRadius - dist2) * brushStrength, 0.0, 1.0);');
+			frag.write('str = clamp(str, 0.0, 1.0);');
+		}
+
 		frag.write('    fragColor[0] = vec4(basecol, str);');
 		frag.write('    fragColor[1] = vec4(nortan, 1.0);');
 		// frag.write('    fragColor[1] = vec4(nortan, str);');

Sources/arm/UITrait.hx

@@ -304,6 +304,7 @@ class UITrait extends iron.Trait {
 	public var paintHeight = false;
 	
 	public var paintVisible = true;
+	public var mirrorX = false;
 
 	function linkFloat(object:Object, mat:MaterialData, link:String):Null<kha.FastFloat> {
 
@@ -1276,14 +1277,12 @@ class UITrait extends iron.Trait {
 		#end
 	}
 
-
 	function renderUI(g:kha.graphics2.Graphics) {
 		if (!show) return;
 
 		if (!arm.App.uienabled && ui.inputRegistered) ui.unregisterInput();
 		if (arm.App.uienabled && !ui.inputRegistered) ui.registerInput();
 
-		// var brushImg = bundled.get('brush.jpg');
 		var envThumb = bundled.get('env_thumb.jpg');
 		var cursorImg = bundled.get('cursor.png');
 		var mouse = iron.system.Input.getMouse();
@@ -1307,6 +1306,17 @@ class UITrait extends iron.Trait {
 			else {
 				var psize = Std.int(cursorImg.width * (brushRadius * brushNodesRadius));
 				g.drawScaledImage(cursorImg, mx - psize / 2, my - psize / 2, psize, psize);
+
+				if (mirrorX) {
+					var cx = iron.App.w() / 2;
+					var nx = cx + (cx - mx);
+					// Separator line
+					g.color = 0x66ffffff;
+					g.fillRect(cx - 1, 0, 2, iron.App.h());
+					// Cursor
+					g.drawScaledImage(cursorImg, nx - psize / 2, my - psize / 2, psize, psize);
+					g.color = 0xffffffff;
+				}
 			}
 		}
 
@@ -1666,7 +1676,13 @@ class UITrait extends iron.Trait {
 						UINodes.inst.parsePaintMaterial();
 					}
 
+					ui.row([1/2,1/2]);
 					paintVisible = ui.check(Id.handle({selected: paintVisible}), "Visible Only");
+					mirrorX = ui.check(Id.handle({selected: mirrorX}), "Mirror");
+					if (ui.changed) {
+						UINodes.inst.updateCanvasMap();
+						UINodes.inst.parsePaintMaterial();
+					}
 				}
 
 				if (ui.panel(Id.handle({selected: true}), "Material")) {