shaderir: Add a test for nested function calls

internal/shader/shader.go

@@ -616,6 +616,20 @@ func (cs *compileState) parseBlock(outer *block, b *ast.BlockStmt, inParams, out
 			block.ir.Stmts = append(block.ir.Stmts, shaderir.Stmt{
 				Type: shaderir.Return,
 			})
+		case *ast.ExprStmt:
+			exprs, stmts := cs.parseExpr(block, l.X)
+			block.ir.Stmts = append(block.ir.Stmts, stmts...)
+			for _, expr := range exprs {
+				if expr.Type != shaderir.Call {
+					continue
+				}
+				block.ir.Stmts = append(block.ir.Stmts, shaderir.Stmt{
+					Type:  shaderir.ExprStmt,
+					Exprs: []shaderir.Expr{expr},
+				})
+			}
+		default:
+			cs.addError(l.Pos(), fmt.Sprintf("unexpected statement: %#v", l))
 		}
 	}
 

internal/shader/shader_test.go

@@ -236,6 +236,32 @@ void F1(in float l0, out float l1, out float l2) {
 	l1 = l0;
 	l2 = l0;
 	return;
+}`,
+		},
+		{
+			Name: "call multiple out params nested",
+			Src: `package main
+
+func Foo(x vec2) {
+	Bar(Bar(x.x, x.y))
+}
+
+func Bar(x, y float) (float, float) {
+	return x, y
+}`,
+			VS: `void F0(in vec2 l0) {
+	float l1 = 0.0;
+	float l2 = 0.0;
+	float l3 = 0.0;
+	float l4 = 0.0;
+	F1((l0).x, (l0).y, l1, l2);
+	F1(l1, l2, l3, l4);
+}
+
+void F1(in float l0, in float l1, out float l2, out float l3) {
+	l2 = l0;
+	l3 = l1;
+	return;
 }`,
 		},
 		{