diff --git a/internal/shaderir/glsl.go b/internal/shaderir/glsl.go
index a245e707c..8a0886b8a 100644
--- a/internal/shaderir/glsl.go
+++ b/internal/shaderir/glsl.go
@@ -203,10 +203,6 @@ func (p *Program) glslFunc(f *Func) []string {
 		args = append(args, "in "+p.glslVarDecl(&t, fmt.Sprintf("l%d", idx)))
 		idx++
 	}
-	for _, t := range f.InOutParams {
-		args = append(args, "inout "+p.glslVarDecl(&t, fmt.Sprintf("l%d", idx)))
-		idx++
-	}
 	for _, t := range f.OutParams {
 		args = append(args, "out "+p.glslVarDecl(&t, fmt.Sprintf("l%d", idx)))
 		idx++
diff --git a/internal/shaderir/ir_test.go b/internal/shaderir/ir_test.go
index 5b9c4d512..67d27b260 100644
--- a/internal/shaderir/ir_test.go
+++ b/internal/shaderir/ir_test.go
@@ -233,18 +233,15 @@ varying vec3 V0;`,
 							{Main: Vec2},
 							{Main: Vec4},
 						},
-						InOutParams: []Type{
-							{Main: Mat2},
-						},
 						OutParams: []Type{
 							{Main: Mat4},
 						},
 					},
 				},
 			},
-			GlslVS: `void F0(in float l0, in vec2 l1, in vec4 l2, inout mat2 l3, out mat4 l4) {
+			GlslVS: `void F0(in float l0, in vec2 l1, in vec4 l2, out mat4 l3) {
 }`,
-			GlslFS: `void F0(in float l0, in vec2 l1, in vec4 l2, inout mat2 l3, out mat4 l4) {
+			GlslFS: `void F0(in float l0, in vec2 l1, in vec4 l2, out mat4 l3) {
 }`,
 		},
 		{
@@ -282,9 +279,6 @@ varying vec3 V0;`,
 						InParams: []Type{
 							{Main: Float},
 						},
-						InOutParams: []Type{
-							{Main: Float},
-						},
 						OutParams: []Type{
 							{Main: Float},
 						},
@@ -295,13 +289,13 @@ varying vec3 V0;`,
 					},
 				},
 			},
-			GlslVS: `void F0(in float l0, inout float l1, out float l2) {
+			GlslVS: `void F0(in float l0, out float l1) {
+	mat4 l2 = mat4(0.0);
 	mat4 l3 = mat4(0.0);
-	mat4 l4 = mat4(0.0);
 }`,
-			GlslFS: `void F0(in float l0, inout float l1, out float l2) {
+			GlslFS: `void F0(in float l0, out float l1) {
+	mat4 l2 = mat4(0.0);
 	mat4 l3 = mat4(0.0);
-	mat4 l4 = mat4(0.0);
 }`,
 		},
 		{
@@ -313,9 +307,6 @@ varying vec3 V0;`,
 						InParams: []Type{
 							{Main: Float},
 						},
-						InOutParams: []Type{
-							{Main: Float},
-						},
 						OutParams: []Type{
 							{Main: Float},
 						},
@@ -336,20 +327,20 @@ varying vec3 V0;`,
 					},
 				},
 			},
-			GlslVS: `void F0(in float l0, inout float l1, out float l2) {
+			GlslVS: `void F0(in float l0, out float l1) {
+	mat4 l2 = mat4(0.0);
 	mat4 l3 = mat4(0.0);
-	mat4 l4 = mat4(0.0);
 	{
+		mat4 l4 = mat4(0.0);
 		mat4 l5 = mat4(0.0);
-		mat4 l6 = mat4(0.0);
 	}
 }`,
-			GlslFS: `void F0(in float l0, inout float l1, out float l2) {
+			GlslFS: `void F0(in float l0, out float l1) {
+	mat4 l2 = mat4(0.0);
 	mat4 l3 = mat4(0.0);
-	mat4 l4 = mat4(0.0);
 	{
+		mat4 l4 = mat4(0.0);
 		mat4 l5 = mat4(0.0);
-		mat4 l6 = mat4(0.0);
 	}
 }`,
 		},
diff --git a/internal/shaderir/program.go b/internal/shaderir/program.go
index 376fe359c..8613ffe5e 100644
--- a/internal/shaderir/program.go
+++ b/internal/shaderir/program.go
@@ -28,12 +28,11 @@ type Program struct {
 }
 
 type Func struct {
-	Index       int
-	InParams    []Type
-	InOutParams []Type
-	OutParams   []Type
-	Return      Type
-	Block       Block
+	Index     int
+	InParams  []Type
+	OutParams []Type
+	Return    Type
+	Block     Block
 }
 
 // VertexFunc takes pseudo params, and the number if len(attributes) + len(varyings) + 1.