gl_shader_decompiler: Add support for TEXS instruction.

src/video_core/engines/shader_bytecode.h

@@ -16,10 +16,6 @@ struct Register {
 
     constexpr Register(u64 value) : value(value) {}
 
-    constexpr u64 GetIndex() const {
-        return value;
-    }
-
     constexpr operator u64() const {
         return value;
     }
@@ -71,6 +67,19 @@ union Attribute {
     u64 value;
 };
 
+union Sampler {
+    Sampler() = default;
+
+    constexpr Sampler(u64 value) : value(value) {}
+
+    enum class Index : u64 {
+        Sampler_0 = 8,
+    };
+
+    BitField<36, 13, Index> index;
+    u64 value;
+};
+
 union Uniform {
     BitField<20, 14, u64> offset;
     BitField<34, 5, u64> index;
@@ -295,7 +304,6 @@ union Instruction {
     BitField<20, 8, Register> gpr20;
     BitField<20, 7, SubOp> sub_op;
     BitField<28, 8, Register> gpr28;
-    BitField<36, 13, u64> imm36;
     BitField<39, 8, Register> gpr39;
 
     union {
@@ -316,6 +324,7 @@ union Instruction {
 
     Attribute attribute;
     Uniform uniform;
+    Sampler sampler;
 
     u64 hex;
 };