3 files changed, 10 insertions, 13 deletions
diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
index 6e702e5..3d8d34b 100644
--- a/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager.cpp
@@ -210,11 +210,6 @@ void QGLEngineShaderManager::setCompositionMode(QPainter::CompositionMode mode)
     shaderProgNeedsChanging = true; //###
 }
 
-bool QGLEngineShaderManager::shaderProgramDirty()
-{
-    return shaderProgNeedsChanging;
-}
-
 QGLShaderProgram* QGLEngineShaderManager::currentProgram()
 {
     return currentShaderProg;
@@ -228,9 +223,13 @@ QGLShaderProgram* QGLEngineShaderManager::simpleProgram()
 
 
 
-// Select & use the correct shader program using the current state
-void QGLEngineShaderManager::useCorrectShaderProg()
+// Select & use the correct shader program using the current state.
+// Returns true if program needed changing.
+bool QGLEngineShaderManager::useCorrectShaderProg()
 {
+    if (!shaderProgNeedsChanging)
+        return false;
+
     QGLEngineShaderProg requiredProgram;
     requiredProgram.program = 0;
 
@@ -400,7 +399,7 @@ void QGLEngineShaderManager::useCorrectShaderProg()
             currentShaderProg = prog.program;
             currentShaderProg->enable();
             shaderProgNeedsChanging = false;
-            return;
+            return true;
         }
     }
 
@@ -442,6 +441,7 @@ void QGLEngineShaderManager::useCorrectShaderProg()
         currentShaderProg->enable();
     }
     shaderProgNeedsChanging = false;
+    return true;
 }
 
 void QGLEngineShaderManager::compileNamedShader(QGLEngineShaderManager::ShaderName name, QGLShader::ShaderType type)
diff --git a/src/opengl/gl2paintengineex/qglengineshadermanager_p.h b/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
index d3856fe..e9e261f 100644
--- a/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
+++ b/src/opengl/gl2paintengineex/qglengineshadermanager_p.h
@@ -279,8 +279,7 @@ public:
     void setMaskType(MaskType);
     void setCompositionMode(QPainter::CompositionMode);
 
-    bool shaderProgramDirty(); // returns true if the shader program needs to be changed
-    void useCorrectShaderProg();
+    bool useCorrectShaderProg(); // returns true if the shader program needed to be changed
 
     QGLShaderProgram* currentProgram(); // Returns pointer to the shader the manager has chosen
     QGLShaderProgram* simpleProgram(); // Used to draw into e.g. stencil buffers
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
index 5a701aa..7dbdc32 100644
--- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
+++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp
@@ -741,9 +741,7 @@ void QGL2PaintEngineExPrivate::prepareForDraw(bool srcPixelsAreOpaque)
 
 
     // If the shader program needs changing, we change it and mark all uniforms as dirty
-    if (shaderManager->shaderProgramDirty()) {
-        shaderManager->useCorrectShaderProg();
-
+    if (shaderManager->useCorrectShaderProg()) {
         // The shader program has changed so mark all uniforms as dirty:
         brushUniformsDirty = true;
         shaderMatrixUniformDirty = true;