--- qtbase-everywhere-src-5.13.2/src/gui/opengl/qopengltextureblitter.cpp.orig	2020-02-29 22:18:53.836334462 +0100
+++ qtbase-everywhere-src-5.13.2/src/gui/opengl/qopengltextureblitter.cpp	2020-02-29 22:16:58.254126170 +0100
@@ -116,7 +116,11 @@
     "void main() {"
     "   vec4 tmpFragColor = texture(textureSampler, uv);"
     "   tmpFragColor.a *= opacity;"
+#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
     "   fragcolor = swizzle ? tmpFragColor.bgra : tmpFragColor;"
+#else
+    "   fragcolor = swizzle ? tmpFragColor.gbar : tmpFragColor;"
+#endif
     "}";
 
 static const char vertex_shader[] =
@@ -138,7 +142,11 @@
     "void main() {"
     "   highp vec4 tmpFragColor = texture2D(textureSampler,uv);"
     "   tmpFragColor.a *= opacity;"
+#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
     "   gl_FragColor = swizzle ? tmpFragColor.bgra : tmpFragColor;"
+#else
+    "   gl_FragColor = swizzle ? tmpFragColor.gbar : tmpFragColor;"
+#endif
     "}";
 
 static const char fragment_shader_external_oes[] =
@@ -150,7 +158,11 @@
     "void main() {"
     "   highp vec4 tmpFragColor = texture2D(textureSampler, uv);"
     "   tmpFragColor.a *= opacity;"
+#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
     "   gl_FragColor = swizzle ? tmpFragColor.bgra : tmpFragColor;"
+#else
+    "   gl_FragColor = swizzle ? tmpFragColor.gbar : tmpFragColor;"
+#endif
     "}";
 
 static const GLfloat vertex_buffer_data[] = {