diff --git a/internal/graphicsdriver/directx/shader_windows.go b/internal/graphicsdriver/directx/shader_windows.go
index 311567659..d327af01f 100644
--- a/internal/graphicsdriver/directx/shader_windows.go
+++ b/internal/graphicsdriver/directx/shader_windows.go
@@ -102,7 +102,7 @@ func compileShader(program *shaderir.Program) (vsh, psh *_ID3DBlob, ferr error)
 		return vsh, psh, nil
 	}
 
-	vs, ps := hlsl.Compile(program)
+	vs, ps, _ := hlsl.Compile(program)
 	var flag uint32 = uint32(_D3DCOMPILE_OPTIMIZATION_LEVEL3)
 
 	var wg errgroup.Group
diff --git a/internal/shader/shader_test.go b/internal/shader/shader_test.go
index cb53d74d5..968fe637d 100644
--- a/internal/shader/shader_test.go
+++ b/internal/shader/shader_test.go
@@ -41,8 +41,8 @@ func glslFragmentNormalize(str string) string {
 	return strings.TrimSpace(str)
 }
 
-func hlslNormalize(str string) string {
-	str = strings.TrimPrefix(str, hlsl.Prelude)
+func hlslNormalize(str string, prelude string) string {
+	str = strings.TrimPrefix(str, prelude)
 	return strings.TrimSpace(str)
 }
 
@@ -180,8 +180,8 @@ func TestCompile(t *testing.T) {
 			}
 
 			if tc.HLSL != nil {
-				vs, _ := hlsl.Compile(s)
-				if got, want := hlslNormalize(vs), hlslNormalize(string(tc.HLSL)); got != want {
+				vs, _, prelude := hlsl.Compile(s)
+				if got, want := hlslNormalize(vs, prelude), hlslNormalize(string(tc.HLSL), prelude); got != want {
 					compare(t, "HLSL", got, want)
 				}
 			}
diff --git a/internal/shader/testdata/vertex.expected.hlsl b/internal/shader/testdata/vertex.expected.hlsl
index 4525c0a8e..5ffd875f5 100644
--- a/internal/shader/testdata/vertex.expected.hlsl
+++ b/internal/shader/testdata/vertex.expected.hlsl
@@ -2,7 +2,7 @@ cbuffer Uniforms : register(b0) {
 	float2 U0 : packoffset(c0);
 }
 
-Varyings VSMain(float2 A0 : POSITION, float2 A1 : TEXCOORD, float4 A2 : COLOR) {
+Varyings VSMain(float2 A0 : POSITION, float2 A1 : TEXCOORD, float4 A2 : COLOR0) {
 	Varyings varyings;
 	float4x4 l0 = 0.0;
 	varyings.Position = 0.0;
diff --git a/internal/shaderir/hlsl/hlsl.go b/internal/shaderir/hlsl/hlsl.go
index d1e558407..aa7d11417 100644
--- a/internal/shaderir/hlsl/hlsl.go
+++ b/internal/shaderir/hlsl/hlsl.go
@@ -52,7 +52,7 @@ func (c *compileContext) structName(p *shaderir.Program, t *shaderir.Type) strin
 	return n
 }
 
-const Prelude = `float mod(float x, float y) {
+const utilFuncs = `float mod(float x, float y) {
 	return x - y * floor(x/y);
 }
 
@@ -80,7 +80,7 @@ float4x4 float4x4FromScalar(float x) {
 	return float4x4(x, 0, 0, 0, 0, x, 0, 0, 0, 0, x, 0, 0, 0, 0, x);
 }`
 
-func Compile(p *shaderir.Program) (vertexShader, pixelShader string) {
+func Compile(p *shaderir.Program) (vertexShader, pixelShader, prelude string) {
 	offsets := CalcUniformMemoryOffsets(p)
 
 	c := &compileContext{
@@ -88,7 +88,7 @@ func Compile(p *shaderir.Program) (vertexShader, pixelShader string) {
 	}
 
 	var lines []string
-	lines = append(lines, strings.Split(Prelude, "\n")...)
+	lines = append(lines, strings.Split(utilFuncs, "\n")...)
 
 	lines = append(lines, "", "struct Varyings {")
 	lines = append(lines, "\tfloat4 Position : SV_POSITION;")
@@ -96,7 +96,7 @@ func Compile(p *shaderir.Program) (vertexShader, pixelShader string) {
 		for i, v := range p.Varyings {
 			switch i {
 			case 0:
-				lines = append(lines, fmt.Sprintf("\tfloat2 M%d : TEXCOORD0;", i))
+				lines = append(lines, fmt.Sprintf("\tfloat2 M%d : TEXCOORD;", i))
 			case 1:
 				lines = append(lines, fmt.Sprintf("\tfloat4 M%d : COLOR0;", i))
 			default:
@@ -110,6 +110,8 @@ func Compile(p *shaderir.Program) (vertexShader, pixelShader string) {
 		}
 	}
 	lines = append(lines, "};")
+	prelude = strings.Join(lines, "\n")
+
 	lines = append(lines, "", "{{.Structs}}")
 
 	if len(p.Uniforms) > 0 {
@@ -177,7 +179,7 @@ func Compile(p *shaderir.Program) (vertexShader, pixelShader string) {
 			case 0:
 				args = append(args, fmt.Sprintf("float2 A%d : POSITION", i))
 			case 1:
-				args = append(args, fmt.Sprintf("float2 A%d : TEXCOORD0", i))
+				args = append(args, fmt.Sprintf("float2 A%d : TEXCOORD", i))
 			case 2:
 				args = append(args, fmt.Sprintf("float4 A%d : COLOR0", i))
 			default: