[plasma/kwin] src/opengl: opengl: fix shaders with the external_oes extension

Git commit bf74abc685eb4a2c8654b33f7b24690e9d214f05 by Xaver Hugl.
Committed on 31/07/2026 at 11:46.
Pushed by zamundaaa into branch 'master'.

opengl: fix shaders with the external_oes extension

The extension has to be enabled before any non-preprocessor code in the shader.
To keep both shaders and the preprocessor as simple as possible, just require
the extension in all shaders.

M  +0    -1    src/opengl/base.frag
M  +2    -0    src/opengl/glshader.cpp

https://invent.kde.org/plasma/kwin/-/commit/bf74abc685eb4a2c8654b33f7b24690e9d214f05

diff --git a/src/opengl/base.frag b/src/opengl/base.frag
index 78d21f6cb06..afd4bdc105c 100644
--- a/src/opengl/base.frag
+++ b/src/opengl/base.frag
@@ -10,7 +10,6 @@ uniform sampler2D sampler1;
 #endif
 
 #if TRAIT_MAP_EXTERNAL_TEXTURE
-#extension GL_OES_EGL_image_external : require
 uniform samplerExternalOES sampler;
 in vec2 texcoord0;
 #endif
diff --git a/src/opengl/glshader.cpp b/src/opengl/glshader.cpp
index 399902cb0b8..96355d538d1 100644
--- a/src/opengl/glshader.cpp
+++ b/src/opengl/glshader.cpp
@@ -85,10 +85,12 @@ std::optional<QByteArray> GLShader::preprocess(const QByteArray &src, GLenum sha
     if (recursionDepth == 1) {
         if (coreShader) {
             ret.append("#version 300 es\n");
+            ret.append("#extension GL_OES_EGL_image_external : require\n");
             ret.append("precision highp float;\n");
             ret.append("precision highp sampler2D;\n");
             ret.append("precision highp sampler3D;\n");
         } else {
+            ret.append("#extension GL_OES_EGL_image_external : require\n");
             // derivative functions are optional in 2.0
             ret.append("#extension GL_OES_standard_derivatives : enable\n");
             ret.append("precision highp float;\n");