Output readonly for suitable glsl buffers (#845)

* Output readonly on buffers for glsl if resource is readonly.
Didn't add to emitGLSLParameterGroup because the cases there seem to to either be implicitly read only, or allow write.

* * Improve comments around use of 'readonly' on glsl output
* Use readonly with shaderRecord

* Add comment pointing out shader record can be rw on vk, so might require changes in the future.

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/vkray/closesthit.slang.glsl b/tests/vkray/closesthit.slang.glsl
index 46c5ea636..d85e982fa 100644
--- a/tests/vkray/closesthit.slang.glsl
+++ b/tests/vkray/closesthit.slang.glsl
@@ -21,12 +21,12 @@ struct SLANG_ParameterGroup_ShaderRecord_0
 };
 
 layout(shaderRecordNV)
-buffer tmp_shaderrecord
+readonly buffer tmp_shaderrecord
 {
     SLANG_ParameterGroup_ShaderRecord_0 _data;
 } ShaderRecord_0;
 
-layout(std430, binding = 0) buffer tmp_colors
+layout(std430, binding = 0) readonly buffer tmp_colors
 {
     vec4 _data[];
 } colors_0;