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ayo committed 2026-10-16 05:20:08 -04:00
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commit 73994d4634
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patches/zluda/0005-null-texture-objects-read-zero.patch
-40
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@@ -1,40 +0,0 @@
From: d4r
Subject: [PATCH] null texture objects read as zero
CUDA texture object 0 reads as zeros on NVIDIA GPUs, and DLSS samples absent optional inputs
(its exposure scales, with the flags Ghost of Tsushima uses) that way. A ZLUDA texture object is a
descriptor pointer, so handle 0 made the GPU read address 0 and fault. Handle 0 now points at an
all-zero descriptor, which AMD hardware treats as a null resource. Rebuild ptx/lib/*.bc after
applying (scripts/build_zluda_ptx_helpers.sh).
---
--- a/ptx/lib/zluda_ptx_impl.cpp 2026-09-27 16:47:02.815623944 -0400
+++ b/ptx/lib/zluda_ptx_impl.cpp 2026-09-27 16:47:02.815623944 -0400
@@ -1725,9 +1725,18 @@
c;
}
+ // d4r: CUDA texture object 0 reads as zeros on NVIDIA GPUs, and DLSS samples absent optional inputs
+ // (exposure scales) that way. A ZLUDA texture object is a descriptor pointer, so 0 is redirected to
+ // an all-zero descriptor, which AMD hardware treats as a null resource (reads return 0).
+ __device__ static unsigned int d4r_null_texture[32];
+ static uint64_t texture_or_null(uint64_t texobj) __device__
+ {
+ return texobj != 0 ? texobj : uint64_t(uintptr_t(d4r_null_texture));
+ }
+
static std::pair<GLOBAL_SPACE void *, GLOBAL_SPACE void *> get_image_and_sampler(uint64_t texobj) __device__
{
- unsigned int GLOBAL_SPACE *image = (unsigned int GLOBAL_SPACE *)texobj;
+ unsigned int GLOBAL_SPACE *image = (unsigned int GLOBAL_SPACE *)texture_or_null(texobj);
unsigned int GLOBAL_SPACE *sampler = image + HIP_SAMPLER_OBJECT_OFFSET_DWORD;
return {image, sampler};
}
@@ -1868,7 +1877,7 @@
#define tex_2d_gather4(COMPONENT) \
v4f32 FUNC(texobj_gather4##COMPONENT##_2d_v4_f32_f32)(uint64_t texobj, v2f32 coord) \
{ \
- auto image = reinterpret_cast<unsigned int CONSTANT_SPACE *>(static_cast<uintptr_t>(texobj)); \
+ auto image = reinterpret_cast<unsigned int CONSTANT_SPACE *>(static_cast<uintptr_t>(texture_or_null(texobj))); \
auto sampler = image + HIP_SAMPLER_OBJECT_OFFSET_DWORD; \
float2 coordinates{coord.x, coord.y}; \
auto result = __ockl_image_gather4##COMPONENT##_2D(image, sampler, get_native_vector(coordinates)); \