Use GLSL 1.40 shaders as GLSL 300 es shaders for effects

Like for the scene shaders. Makes the effects work again when using
GLES 3.

effects/coverswitch/coverswitch.cpp

@@ -68,10 +68,13 @@ CoverSwitchEffect::CoverSwitchEffect()
     captionFont.setPointSize(captionFont.pointSize() * 2);
 
     QString shadersDir = "kwin/shaders/1.10/";
-#ifndef KWIN_HAVE_OPENGLES
-    if (GLPlatform::instance()->glslVersion() >= kVersionNumber(1, 40))
-        shadersDir = "kwin/shaders/1.40/";
+#ifdef KWIN_HAVE_OPENGLES
+    const qint64 coreVersionNumber = kVersionNumber(3, 0);
+#else
+    const qint64 coreVersionNumber = kVersionNumber(1, 40);
 #endif
+    if (GLPlatform::instance()->glslVersion() >= coreVersionNumber)
+        shadersDir = "kwin/shaders/1.40/";
     const QString fragmentshader = KGlobal::dirs()->findResource("data", shadersDir + "coverswitch-reflection.glsl");
     m_reflectionShader = ShaderManager::instance()->loadFragmentShader(ShaderManager::GenericShader, fragmentshader);
     connect(effects, SIGNAL(windowClosed(KWin::EffectWindow*)), this, SLOT(slotWindowClosed(KWin::EffectWindow*)));

effects/cube/cube.cpp

@@ -100,10 +100,13 @@ CubeEffect::CubeEffect()
     desktopNameFont.setBold(true);
     desktopNameFont.setPointSize(14);
 
-#ifndef KWIN_HAVE_OPENGLES
-    if (GLPlatform::instance()->glslVersion() >= kVersionNumber(1, 40))
-        m_shadersDir = "kwin/shaders/1.40/";
+#ifdef KWIN_HAVE_OPENGLES
+    const qint64 coreVersionNumber = kVersionNumber(3, 0);
+#else
+    const qint64 coreVersionNumber = kVersionNumber(1, 40);
 #endif
+    if (GLPlatform::instance()->glslVersion() >= coreVersionNumber)
+        m_shadersDir = "kwin/shaders/1.40/";
 
     const QString fragmentshader = KGlobal::dirs()->findResource("data", m_shadersDir + "cube-reflection.glsl");
     m_reflectionShader = ShaderManager::instance()->loadFragmentShader(ShaderManager::GenericShader, fragmentshader);

effects/invert/invert.cpp

@@ -73,10 +73,13 @@ bool InvertEffect::loadData()
     m_inited = true;
 
     QString shadersDir = "kwin/shaders/1.10/";
-#ifndef KWIN_HAVE_OPENGLES
-    if (GLPlatform::instance()->glslVersion() >= kVersionNumber(1, 40))
-        shadersDir = "kwin/shaders/1.40/";
+#ifdef KWIN_HAVE_OPENGLES
+    const qint64 coreVersionNumber = kVersionNumber(3, 0);
+#else
+    const qint64 coreVersionNumber = kVersionNumber(1, 40);
 #endif
+    if (GLPlatform::instance()->glslVersion() >= coreVersionNumber)
+        shadersDir = "kwin/shaders/1.40/";
     const QString fragmentshader =  KGlobal::dirs()->findResource("data", shadersDir + "invert.frag");
 
     m_shader = ShaderManager::instance()->loadFragmentShader(ShaderManager::GenericShader, fragmentshader);

effects/lookingglass/lookingglass.cpp

@@ -117,10 +117,13 @@ bool LookingGlassEffect::loadData()
     }
 
     QString shadersDir = "kwin/shaders/1.10/";
-#ifndef KWIN_HAVE_OPENGLES
-    if (GLPlatform::instance()->glslVersion() >= kVersionNumber(1, 40))
-        shadersDir = "kwin/shaders/1.40/";
+#ifdef KWIN_HAVE_OPENGLES
+    const qint64 coreVersionNumber = kVersionNumber(3, 0);
+#else
+    const qint64 coreVersionNumber = kVersionNumber(1, 40);
 #endif
+    if (GLPlatform::instance()->glslVersion() >= coreVersionNumber)
+        shadersDir = "kwin/shaders/1.40/";
     const QString fragmentshader =  KGlobal::dirs()->findResource("data", shadersDir + "lookingglass.frag");
     m_shader = ShaderManager::instance()->loadFragmentShader(ShaderManager::SimpleShader, fragmentshader);
     if (m_shader->isValid()) {