| #pragma clang diagnostic ignored "-Wmissing-prototypes" |
| |
| #include <metal_stdlib> |
| #include <simd/simd.h> |
| |
| using namespace metal; |
| |
| enum class spvSwizzle : uint |
| { |
| none = 0, |
| zero, |
| one, |
| red, |
| green, |
| blue, |
| alpha |
| }; |
| |
| template<typename T> struct spvRemoveReference { typedef T type; }; |
| template<typename T> struct spvRemoveReference<thread T&> { typedef T type; }; |
| template<typename T> struct spvRemoveReference<thread T&&> { typedef T type; }; |
| template<typename T> inline constexpr thread T&& spvForward(thread typename spvRemoveReference<T>::type& x) |
| { |
| return static_cast<thread T&&>(x); |
| } |
| template<typename T> inline constexpr thread T&& spvForward(thread typename spvRemoveReference<T>::type&& x) |
| { |
| return static_cast<thread T&&>(x); |
| } |
| |
| template<typename T> |
| inline T spvGetSwizzle(vec<T, 4> x, T c, spvSwizzle s) |
| { |
| switch (s) |
| { |
| case spvSwizzle::none: |
| return c; |
| case spvSwizzle::zero: |
| return 0; |
| case spvSwizzle::one: |
| return 1; |
| case spvSwizzle::red: |
| return x.r; |
| case spvSwizzle::green: |
| return x.g; |
| case spvSwizzle::blue: |
| return x.b; |
| case spvSwizzle::alpha: |
| return x.a; |
| } |
| } |
| |
| // Wrapper function that swizzles texture samples and fetches. |
| template<typename T> |
| inline vec<T, 4> spvTextureSwizzle(vec<T, 4> x, uint s) |
| { |
| if (!s) |
| return x; |
| return vec<T, 4>(spvGetSwizzle(x, x.r, spvSwizzle((s >> 0) & 0xFF)), spvGetSwizzle(x, x.g, spvSwizzle((s >> 8) & 0xFF)), spvGetSwizzle(x, x.b, spvSwizzle((s >> 16) & 0xFF)), spvGetSwizzle(x, x.a, spvSwizzle((s >> 24) & 0xFF))); |
| } |
| |
| template<typename T> |
| inline T spvTextureSwizzle(T x, uint s) |
| { |
| return spvTextureSwizzle(vec<T, 4>(x, 0, 0, 1), s).x; |
| } |
| |
| // Wrapper function that swizzles texture gathers. |
| template<typename T, typename Tex, typename... Ts> |
| inline vec<T, 4> spvGatherSwizzle(sampler s, const thread Tex& t, Ts... params, component c, uint sw) METAL_CONST_ARG(c) |
| { |
| if (sw) |
| { |
| switch (spvSwizzle((sw >> (uint(c) * 8)) & 0xFF)) |
| { |
| case spvSwizzle::none: |
| break; |
| case spvSwizzle::zero: |
| return vec<T, 4>(0, 0, 0, 0); |
| case spvSwizzle::one: |
| return vec<T, 4>(1, 1, 1, 1); |
| case spvSwizzle::red: |
| return t.gather(s, spvForward<Ts>(params)..., component::x); |
| case spvSwizzle::green: |
| return t.gather(s, spvForward<Ts>(params)..., component::y); |
| case spvSwizzle::blue: |
| return t.gather(s, spvForward<Ts>(params)..., component::z); |
| case spvSwizzle::alpha: |
| return t.gather(s, spvForward<Ts>(params)..., component::w); |
| } |
| } |
| switch (c) |
| { |
| case component::x: |
| return t.gather(s, spvForward<Ts>(params)..., component::x); |
| case component::y: |
| return t.gather(s, spvForward<Ts>(params)..., component::y); |
| case component::z: |
| return t.gather(s, spvForward<Ts>(params)..., component::z); |
| case component::w: |
| return t.gather(s, spvForward<Ts>(params)..., component::w); |
| } |
| } |
| |
| // Wrapper function that swizzles depth texture gathers. |
| template<typename T, typename Tex, typename... Ts> |
| inline vec<T, 4> spvGatherCompareSwizzle(sampler s, const thread Tex& t, Ts... params, uint sw) |
| { |
| if (sw) |
| { |
| switch (spvSwizzle(sw & 0xFF)) |
| { |
| case spvSwizzle::none: |
| case spvSwizzle::red: |
| break; |
| case spvSwizzle::zero: |
| case spvSwizzle::green: |
| case spvSwizzle::blue: |
| case spvSwizzle::alpha: |
| return vec<T, 4>(0, 0, 0, 0); |
| case spvSwizzle::one: |
| return vec<T, 4>(1, 1, 1, 1); |
| } |
| } |
| return t.gather_compare(s, spvForward<Ts>(params)...); |
| } |
| |
| kernel void main0(constant uint* spvSwizzleConstants [[buffer(30)]], texture2d<float> foo [[texture(0)]], texture2d<float, access::write> bar [[texture(1)]], sampler fooSmplr [[sampler(0)]]) |
| { |
| constant uint32_t& fooSwzl = spvSwizzleConstants[0]; |
| bar.write(spvTextureSwizzle(foo.sample(fooSmplr, float2(1.0), level(0.0)), fooSwzl), uint2(int2(0))); |
| } |
| |