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vkd3d-shader/spirv: Clamp push constant CBV sizes to those of the push constant ranges backing them.

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Otherwise invalid SPIR-V may be generated, because the CBV field in
"push_cb_struct" may end up overlapping with a subsequent one.
This commit is contained in:
Giovanni Mascellani
2025-11-12 13:43:59 +01:00
committed by Henri Verbeet
parent 2903831f79
commit 7f377879fc
Notes: Henri Verbeet 2025-11-12 15:31:45 +01:00 
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1826
3 changed files with 11 additions and 5 deletions
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13
libs/vkd3d-shader/spirv.c
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@@ -6668,13 +6668,18 @@ static void spirv_compiler_emit_cbv_declaration(struct spirv_compiler *compiler,
/* Push constant buffers are handled in
* spirv_compiler_emit_push_constant_buffers().
*/
push_cb->reg = reg;
push_cb->size = size;
if (size_in_bytes > push_cb->pc.size)
{
WARN("Constant buffer size %u exceeds push constant size %u.\n",
size_in_bytes, push_cb->pc.size);
spirv_compiler_warning(compiler, VKD3D_SHADER_WARNING_SPV_INVALID_SIZE,
"Constant buffer cb%u, space %u, has size %u which exceeds the push constant size %u.",
push_cb->pc.register_index, push_cb->pc.register_space, size_in_bytes, push_cb->pc.size);
size_in_bytes = push_cb->pc.size;
size = align(size_in_bytes, VKD3D_VEC4_SIZE * sizeof(uint32_t));
size /= VKD3D_VEC4_SIZE * sizeof(uint32_t);
}
push_cb->reg = reg;
push_cb->size = size;
return;
}