diff --git a/internal/shaderir/glsl.go b/internal/shaderir/glsl.go
index d7f5e8d52..740c788c3 100644
--- a/internal/shaderir/glsl.go
+++ b/internal/shaderir/glsl.go
@@ -99,8 +99,25 @@ func (p *Program) glslFunc(f *Func) []string {
 		argsstr = strings.Join(args, ", ")
 	}
 
-	return []string{
-		fmt.Sprintf(`void %s(%s) {`, f.Name, argsstr),
-		`}`,
-	}
+	var lines []string
+	lines = append(lines, fmt.Sprintf("void %s(%s) {", f.Name, argsstr))
+	lines = append(lines, p.glslBlock(&f.Block, f, 0)...)
+	lines = append(lines, "}")
+
+	return lines
+}
+
+func (p *Program) glslBlock(b *Block, f *Func, level int) []string {
+	idt := strings.Repeat("\t", level+1)
+
+	var lines []string
+	var idx int
+	if level == 0 {
+		idx = len(f.InParams) + len(f.InOutParams) + len(f.OutParams)
+	}
+	for _, t := range b.LocalVars {
+		lines = append(lines, fmt.Sprintf("%s%s;", idt, p.glslVarDecl(&t, fmt.Sprintf("l%d", idx))))
+		idx++
+	}
+	return lines
 }
diff --git a/internal/shaderir/ir_test.go b/internal/shaderir/ir_test.go
index 479817d41..825a88f44 100644
--- a/internal/shaderir/ir_test.go
+++ b/internal/shaderir/ir_test.go
@@ -122,6 +122,35 @@ varying vec3 V0;`,
 				},
 			},
 			Glsl: `void F0(in float l0, in vec2 l1, in vec4 l2, inout mat2 l3, out mat4 l4) {
+}`,
+		},
+		{
+			Name: "FuncLocals",
+			Program: Program{
+				Funcs: []Func{
+					{
+						Name: "F0",
+						InParams: []Type{
+							{Main: Float},
+						},
+						InOutParams: []Type{
+							{Main: Float},
+						},
+						OutParams: []Type{
+							{Main: Float},
+						},
+						Block: Block{
+							LocalVars: []Type{
+								{Main: Mat4},
+								{Main: Mat4},
+							},
+						},
+					},
+				},
+			},
+			Glsl: `void F0(in float l0, inout float l1, out float l2) {
+	mat4 l3;
+	mat4 l4;
 }`,
 		},
 	}