diff --git a/render/vulkan/shaders/common.vert b/render/vulkan/shaders/common.vert
index fa31d26c..c6175d24 100644
--- a/render/vulkan/shaders/common.vert
+++ b/render/vulkan/shaders/common.vert
@@ -10,16 +10,9 @@ layout(push_constant, row_major) uniform UBO {
 
 layout(location = 0) out vec2 uv;
 
-// 4 outlining points and uv coords
-const vec2[] values = {
-	{0, 0},
-	{1, 0},
-	{1, 1},
-	{0, 1},
-};
-
 void main() {
-	vec2 pos = values[gl_VertexIndex % 4];
+	vec2 pos = vec2(float((gl_VertexIndex + 1) & 2) * 0.5f,
+		float(gl_VertexIndex & 2) * 0.5f);
 	uv = data.uv_offset + pos * data.uv_size;
 	gl_Position = data.proj * vec4(pos, 0.0, 1.0);
 }