From 09dd11be964d44235b1190bf36be6655eb59b902 Mon Sep 17 00:00:00 2001
From: rdb <rdb@users.noreply.github.com>
Date: Mon, 16 Jan 2023 20:02:13 +0100
Subject: [PATCH] GLSL: Support GL_NV_shader_noperspective_interpolation in
 GLES

---
 spirv_glsl.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/spirv_glsl.cpp b/spirv_glsl.cpp
index 4b22d47e..de6cc0a0 100644
--- a/spirv_glsl.cpp
+++ b/spirv_glsl.cpp
@@ -1249,7 +1249,15 @@ string CompilerGLSL::to_interpolation_qualifiers(const Bitset &flags)
 	if (flags.get(DecorationFlat))
 		res += "flat ";
 	if (flags.get(DecorationNoPerspective))
+	{
+		if (options.es)
+		{
+			if (options.version < 300)
+				SPIRV_CROSS_THROW("noperspective requires ESSL 300.");
+			require_extension_internal("GL_NV_shader_noperspective_interpolation");
+		}
 		res += "noperspective ";
+	}
 	if (flags.get(DecorationCentroid))
 		res += "centroid ";
 	if (flags.get(DecorationPatch))