From 79bcaf266f99e7a3ce2c6492aff0308a87c72eea Mon Sep 17 00:00:00 2001
From: Eblo <7004497+Eblo@users.noreply.github.com>
Date: Sun, 22 Oct 2023 12:15:00 -0400
Subject: [PATCH] Fix precision issues in vertex shaders

Restore conditional that makes mediump declaration only apply to fragment shaders
This was erroneously removed to make the Lanczos3 shader link properly, but it resulted in vertex shaders incorrectly defaulting to mediump
Add highp precision declaration to Lanczos3 fragment shader so that it can link
---
 shader/common.h      | 3 +++
 shader/lanczos3.frag | 1 +
 2 files changed, 4 insertions(+)

diff --git a/shader/common.h b/shader/common.h
index 16704c4..a34ef54 100644
--- a/shader/common.h
+++ b/shader/common.h
@@ -1,6 +1,9 @@
 #ifdef GLSLES
 
+#ifdef FRAGMENT_SHADER
+/* Only the fragment shader has no default float precision */
 precision mediump float;
+#endif
 
 #else
 
diff --git a/shader/lanczos3.frag b/shader/lanczos3.frag
index 2f84ae8..8122592 100644
--- a/shader/lanczos3.frag
+++ b/shader/lanczos3.frag
@@ -2,6 +2,7 @@
 // Copyright 2020 Lilian Gimenez (Sentmoraap).
 // MIT license.
 
+precision highp float;
 uniform sampler2D texture;
 uniform vec2 sourceSize;
 uniform vec2 texSizeInv;