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shader: Add support for "negative" and unaligned offsets

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"Negative" offsets don't exist. They are shown as such due to a bug in
nvdisasm.

Unaligned offsets have been proved to read the aligned offset. For
example, when reading an U32, if the offset is 6, the offset read will
be 4.
This commit is contained in:
ReinUsesLisp
2021-05-30 23:08:17 -03:00
committed by ameerj
parent 5d170de0b5
commit 05d41fa9b7
3 changed files with 13 additions and 8 deletions
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8
src/shader_recompiler/backend/glasm/emit_glasm_context_get_set.cpp
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@ -18,6 +18,14 @@ void GetCbuf(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding, ScalarU
throw NotImplementedException("Indirect constant buffer loading");
}
const Register ret{ctx.reg_alloc.Define(inst)};
if (offset.type == Type::U32) {
// Avoid reading arrays out of bounds, matching hardware's behavior
const u32 imm_offset{offset.imm_u32};
if (offset.imm_u32 >= 0x10'000) {
ctx.Add("MOV.S {},0;", ret);
return;
}
}
ctx.Add("LDC.{} {},c{}[{}];", size, ret, binding.U32(), offset);
}