1 files changed, 11 insertions, 0 deletions
diff --git a/src/gui/opengl/qopenglshaderprogram.cpp b/src/gui/opengl/qopenglshaderprogram.cpp
index 2ae9c6d327..6d7aecac6f 100644
--- a/src/gui/opengl/qopenglshaderprogram.cpp
+++ b/src/gui/opengl/qopenglshaderprogram.cpp
@@ -496,6 +496,13 @@ static const char redefineHighp[] =
     "#endif\n";
 #endif
 
+// Boiler-plate header to have the layout attributes available we need later
+static const char blendEquationAdvancedHeader[] =
+    "#ifdef GL_KHR_blend_equation_advanced\n"
+    "#extension GL_ARB_fragment_coord_conventions : enable\n"
+    "#extension GL_KHR_blend_equation_advanced : enable\n"
+    "#endif\n";
+
 struct QVersionDirectivePosition
 {
     Q_DECL_CONSTEXPR QVersionDirectivePosition(int position = 0, int line = -1)
@@ -636,6 +643,10 @@ bool QOpenGLShader::compileSourceCode(const char *source)
                 }
             }
         }
+        if (d->shaderType == Fragment) {
+            sourceChunks.append(blendEquationAdvancedHeader);
+            sourceChunkLengths.append(GLint(sizeof(blendEquationAdvancedHeader) - 1));
+        }
 
         // The precision qualifiers are useful on OpenGL/ES systems,
         // but usually not present on desktop systems.