From 668f1d967bfa748f0a629e956226133a6f3bfa30 Mon Sep 17 00:00:00 2001
From: BearOso <bearoso@gmail.com>
Date: Fri, 7 Aug 2020 14:06:50 -0500
Subject: [PATCH] Shaders: Compile correct GLSL version on legacy.

OpenGL versions below 3.3 will use GLSL version 1.50.
This lets slang shaders work on earlier versions.
---
 shaders/slang.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/shaders/slang.cpp b/shaders/slang.cpp
index 49019db8..d15749c8 100644
--- a/shaders/slang.cpp
+++ b/shaders/slang.cpp
@@ -167,6 +167,8 @@ GLint GLSLShader::slang_compile(std::vector<std::string> &lines,
 
     spirv_cross::CompilerGLSL::Options opts;
     opts.version = gl_version() * 10;
+    if (opts.version < 330 && opts.version > 150)
+        opts.version = 150;
     opts.vulkan_semantics = false;
     glsl.set_common_options(opts);