Remove texture usage enum from Sampler

This is a bit of an awkward API, because we have to manually keep the
CRC list up-to-date when in other cases that's left up to consumers. I
added a comment about how to figure out this value.

src/mtrl.rs

@@ -317,65 +317,13 @@ pub struct Constant {
     values: [f32; 4],
 }
 
-// from https://github.com/NotAdam/Lumina/blob/master/src/Lumina/Data/Parsing/MtrlStructs.cs
-#[binrw]
-#[repr(u8)]
-#[derive(Debug, Clone, Copy)]
-pub enum TextureUsage {
-    #[brw(magic = 0x88408C04u32)]
-    Sampler,
-    #[brw(magic = 0x213CB439u32)]
-    Sampler0,
-    #[brw(magic = 0x563B84AFu32)]
-    Sampler1,
-    #[brw(magic = 0xFEA0F3D2u32)]
-    SamplerCatchlight,
-    #[brw(magic = 0x1E6FEF9Cu32)]
-    SamplerColorMap0,
-    #[brw(magic = 0x6968DF0Au32)]
-    SamplerColorMap1,
-    #[brw(magic = 0x115306BEu32)]
-    SamplerDiffuse,
-    #[brw(magic = 0xF8D7957Au32)]
-    SamplerEnvMap,
-    #[brw(magic = 0x8A4E82B6u32)]
-    SamplerMask,
-    #[brw(magic = 0x0C5EC1F1u32)]
-    SamplerNormal,
-    #[brw(magic = 0xAAB4D9E9u32)]
-    SamplerNormalMap0,
-    #[brw(magic = 0xDDB3E97Fu32)]
-    SamplerNormalMap1,
-    #[brw(magic = 0x87F6474Du32)]
-    SamplerReflection,
-    #[brw(magic = 0x2B99E025u32)]
-    SamplerSpecular,
-    #[brw(magic = 0x1BBC2F12u32)]
-    SamplerSpecularMap0,
-    #[brw(magic = 0x6CBB1F84u32)]
-    SamplerSpecularMap1,
-    #[brw(magic = 0xE6321AFCu32)]
-    SamplerWaveMap,
-    #[brw(magic = 0x574E22D6u32)]
-    SamplerWaveletMap0,
-    #[brw(magic = 0x20491240u32)]
-    SamplerWaveletMap1,
-    #[brw(magic = 0x95E1F64Du32)]
-    SamplerWhitecapMap,
-
-    #[brw(magic = 0x565f8fd8u32)]
-    UnknownDawntrail1,
-
-    #[brw(magic = 0xe5338c17u32)]
-    UnknownDawntrail2,
-}
-
 #[binrw]
 #[derive(Debug, Clone, Copy)]
 #[repr(C)]
 #[allow(dead_code)]
 pub struct Sampler {
-    texture_usage: TextureUsage,
+    /// This is a CRC hash, it can be calculated via ShaderPackage::crc
+    pub texture_usage: u32,
     flags: u32, // TODO: unknown
     texture_index: u8,
     unknown1: u8,

src/shpk.rs

@@ -305,6 +305,7 @@ mod tests {
     fn test_crc() {
         assert_eq!(ShaderPackage::crc("PASS_0"), 0xC5A5389C);
         assert_eq!(ShaderPackage::crc("DecodeDepthBuffer"), 0x2C6C023C);
+        assert_eq!(ShaderPackage::crc("g_Sampler"), 0x88408C04);
     }
 
     #[test]