From 004b279e4f84f4cd03f436517abeb6853d947370 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Wed, 29 Jul 2020 22:43:49 +0900
Subject: [PATCH] shader: Add array initialization

Updates #1235
---
 internal/shader/testdata/array.expected.vs | 8 ++++++++
 internal/shader/testdata/array.go          | 5 +++++
 internal/shaderir/glsl.go                  | 7 ++++++-
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/internal/shader/testdata/array.expected.vs b/internal/shader/testdata/array.expected.vs
index 7f1e40f2c..6f15a3a04 100644
--- a/internal/shader/testdata/array.expected.vs
+++ b/internal/shader/testdata/array.expected.vs
@@ -1 +1,9 @@
 uniform vec2[4] U0;
+
+void F0(out vec2[2] l0);
+
+void F0(out vec2[2] l0) {
+	vec2[2] l1 = vec2[2](vec2(0), vec2(0));
+	l0 = l1;
+	return;
+}
diff --git a/internal/shader/testdata/array.go b/internal/shader/testdata/array.go
index d095b111a..c9d411e5b 100644
--- a/internal/shader/testdata/array.go
+++ b/internal/shader/testdata/array.go
@@ -1,3 +1,8 @@
 package main
 
 var Array [4]vec2
+
+func Foo() [2]vec2 {
+	var x [2]vec2
+	return x
+}
diff --git a/internal/shaderir/glsl.go b/internal/shaderir/glsl.go
index b69291fa7..12ca88046 100644
--- a/internal/shaderir/glsl.go
+++ b/internal/shaderir/glsl.go
@@ -195,7 +195,12 @@ func (p *Program) glslVarInit(t *Type) string {
 	case None:
 		return "?(none)"
 	case Array:
-		panic("not implemented")
+		init := p.glslVarInit(&t.Sub[0])
+		es := make([]string, 0, t.Length)
+		for i := 0; i < t.Length; i++ {
+			es = append(es, init)
+		}
+		return fmt.Sprintf("%s[%d](%s)", t.Sub[0].Glsl(), t.Length, strings.Join(es, ", "))
 	case Struct:
 		panic("not implemented")
 	case Bool: