Question 1

How to compile a GLSL shader to SPIR-V using glslang command line?

Accepted Answer

Use the standalone binary 'glslang' with the appropriate file extension (e.g., .vert for vertex shaders) and options like -V for SPIR-V output. The README provides examples based on file types for different shader stages.

Question 2

Does glslang support Vulkan 1.3 SPIR-V versions?

Accepted Answer

Yes, glslang can target SPIR-V versions such as 1.5 through the setEnvTarget API or command-line options, supporting Vulkan clients up to 1.2, as shown in the C interface example for SPIR-V 1.5.

Question 3

What's the difference between glslang and DXC for HLSL compilation?

Accepted Answer

Glslang has partial, non-reference HLSL support with limited validation, while DXC is Microsoft's official compiler with definitive semantics. For full HLSL compatibility, DXC is preferred, as noted in glslang's README comparing investments.

Question 4

How to integrate glslang into a C++ game engine?

Accepted Answer

Use the C++ class interface from ShaderLang.h: create TShader and TProgram objects, set strings and environments with setEnvInput, then call parse and link methods, as illustrated in StandAlone.cpp for programmatic compilation.

Question 5

Can glslang validate OpenGL ES 3.0 shaders?

Accepted Answer

Yes, glslang supports ESSL (OpenGL ES Shading Language) and can validate shaders against specific versions by configuring the client and version in the input settings, ensuring compliance with OpenGL ES specifications.

Question 6

Is glslang suitable for web-based shader tools?

Accepted Answer

Yes, glslang can be built to WebAssembly using Emscripten with options like -DENABLE_GLSLANG_JS=ON, enabling shader compilation in browsers, though it requires disabling HLSL and optimizations for size, as per the build instructions.

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