In Vulkan, OpTypeStruct must not contain an opaque type.

Hello,

We have a fair amount of shader code running on OpenGL, that we want to reuse on our Vulkan backend. The Vulkan relaxed rules help a lot, but we have a remaining issue with texture samplers declared in a structure. For example:

`struct TexUnit
{
sampler2D smp;
vec4 blah;
};

uniform TexUnit myTex;`

is valid in OpenGL, but not in Vulkan.

While I fully understand the rationale behind this limitation, I would be interested to know if there is a way to get a valid Vulkan SPIRV binary out of this GLSL code, without touching shader code.

Thanks a lot for your help.

The issue names no file, test, or entry point. Start by investigating how glslang handles the shown GLSL structure when targeting Vulkan and SPIR-V, then determine whether a valid binary can be produced without changing the shader source; completion should be a documented, reproducible answer or a clearly scoped implementation plan.

Written by the indexing model from the issue text.