From 88e772cdf7417ddbf0eff8cdf5697b774364baeb Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henrik=20Rydg=C3=A5rd?= <hrydgard@gmail.com>
Date: Tue, 3 Nov 2020 19:53:02 +0100
Subject: [PATCH] GLSL ES: Extensions must go first. Fixes #13620

---
 GPU/Common/ShaderWriter.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/GPU/Common/ShaderWriter.cpp b/GPU/Common/ShaderWriter.cpp
index 323bd3b86c..44959b57fe 100644
--- a/GPU/Common/ShaderWriter.cpp
+++ b/GPU/Common/ShaderWriter.cpp
@@ -96,6 +96,10 @@ void ShaderWriter::Preamble(const char **gl_extensions, size_t num_gl_extensions
 		break;
 	default:  // OpenGL
 		F("#version %d%s\n", lang_.glslVersionNumber, lang_.gles && lang_.glslES30 ? " es" : "");
+		// IMPORTANT! Extensions must be the first thing after #version.
+		for (size_t i = 0; i < num_gl_extensions; i++) {
+			F("%s\n", gl_extensions[i]);
+		}
 		switch (stage_) {
 		case ShaderStage::Fragment:
 			C("#define DISCARD discard\n");
@@ -109,9 +113,6 @@ void ShaderWriter::Preamble(const char **gl_extensions, size_t num_gl_extensions
 			}
 			break;
 		}
-		for (size_t i = 0; i < num_gl_extensions; i++) {
-			F("%s\n", gl_extensions[i]);
-		}
 		if (!lang_.gles) {
 			C("#define lowp\n");
 			C("#define mediump\n");