Support vertex colors

Sources/arm/node/MakePaint.hx

@@ -25,6 +25,7 @@ class MakePaint {
 		con_paint.data.color_writes_green = [true, true, true, true];
 		con_paint.data.color_writes_blue = [true, true, true, true];
 		con_paint.data.color_writes_alpha = [true, true, true, true];
+		con_paint.allow_vcols = Context.paintObject.data.geom.cols != null;
 
 		var vert = con_paint.make_vert();
 		var frag = con_paint.make_frag();

Sources/arm/node/Material.hx

@@ -211,6 +211,10 @@ class Material {
 			vert.add_out("vec4 wvpposition");
 			vert.write_end('wvpposition = gl_Position;');
 		}
+		if (con.is_elem('col')) {
+			vert.add_out('vec3 vcolor');
+			vert.write_attrib('vcolor = col.rgb;');
+		}
 	}
 
 	static function parse_output(node: TNode): TShaderOut {
@@ -378,9 +382,13 @@ class Material {
 
 		if (node.type == "ATTRIBUTE") {
 			if (socket == node.outputs[0]) { // Color
-				curshader.context.add_elem("col", "short4norm"); // Vcols only for now
-				// return "vcolor";
-				return "vec3(0.0, 0.0, 0.0)";
+				if (curshader.context.allow_vcols) {
+					curshader.context.add_elem("col", "short4norm"); // Vcols only for now
+				}
+				else {
+					curshader.write_attrib("vec3 vcolor = vec3(1.0, 1.0, 1.0);");
+				}
+				return "vcolor";
 			}
 			else { // Vector
 				curshader.context.add_elem("tex", "short2norm"); // UVMaps only for now

Sources/arm/node/MaterialShader.hx

@@ -22,6 +22,7 @@ class MaterialShaderContext {
 	public var tesc:MaterialShader;
 	public var tese:MaterialShader;
 	public var data:TShaderContext;
+	public var allow_vcols = false;
 	var material:TMaterial;
 	var constants:Array<TShaderConstant>;
 	var tunits:Array<TTextureUnit>;