diff options
| -rw-r--r-- | docs/user-guide/03-convenience-features.md | 25 | ||||
| -rw-r--r-- | tests/spirv/pointer-from-user-guide.slang | 31 |
2 files changed, 54 insertions, 2 deletions
diff --git a/docs/user-guide/03-convenience-features.md b/docs/user-guide/03-convenience-features.md index 420db18c1..a145c407c 100644 --- a/docs/user-guide/03-convenience-features.md +++ b/docs/user-guide/03-convenience-features.md @@ -422,6 +422,23 @@ int test(MyType* pObj) MyType* pNext2 = &pNext[1]; return pNext.a + pNext->a + (*pNext2).a + pNext2[0].a; } + +cbuffer Constants +{ + MyType *ptr; +}; + +int validTest() +{ + return test(ptr); +} + +int invalidTest() +{ + // cannot produce a pointer from a local variable + MyType obj; + return test(&obj); // !! ERROR !! +} ``` Pointer types can also be specified using the generic syntax: `Ptr<MyType>` is equivalent to `MyType*`. @@ -430,9 +447,13 @@ Pointer types can also be specified using the generic syntax: `Ptr<MyType>` is e - Slang supports pointers to global memory, but not shared or local memory. For example, it is invalid to define a pointer to a local variable. -- Coherent load/stores are unsupported +- Slang supports pointers that are defined as shader parameters (e.g. as a constant buffer field). + +- Slang can produce pointers using the & operator from data in global memory. + +- Slang doesn't support coherent load/stores. -- Custom alignment specification is unsupported. +- Slang doesn't support custom alignment specification. - Slang currently does not support pointers to immutable values, i.e. `const T*`. diff --git a/tests/spirv/pointer-from-user-guide.slang b/tests/spirv/pointer-from-user-guide.slang new file mode 100644 index 000000000..662579c2b --- /dev/null +++ b/tests/spirv/pointer-from-user-guide.slang @@ -0,0 +1,31 @@ +//TEST(compute, vulkan):SIMPLE(filecheck=SPV): -stage compute -entry computeMain -target spirv -emit-spirv-directly + +// This test is to verify the example on the user guide +// and prevent any regressions. + +//TEST_INPUT:ubuffer(data=[0], stride=4):out,name=outputBuffer +RWStructuredBuffer<float> outputBuffer; + +struct MyType +{ + float a; +}; + +float test(MyType* pObj) +{ + //SPV: OpTypePointer + MyType* pNext = pObj + 1; + MyType* pNext2 = &pNext[1]; + return pNext.a + pNext->a + (*pNext2).a + pNext2[0].a; +} + +cbuffer Constants +{ + MyType *ptr; +}; + +[numthreads(1,1,1)] +void computeMain() +{ + outputBuffer[0] = test(ptr); +} |
