GLSL 1.40 shader for invert effect

REVIEW: 110573

effects/invert/CMakeLists.txt

@@ -13,8 +13,11 @@ install( FILES
 
 # Data files
 install( FILES
-    invert/data/invert.frag
-    DESTINATION ${DATA_INSTALL_DIR}/kwin )
+    invert/data/1.10/invert.frag
+    DESTINATION ${DATA_INSTALL_DIR}/kwin/shaders/1.10 )
+install( FILES
+    invert/data/1.40/invert.frag
+    DESTINATION ${DATA_INSTALL_DIR}/kwin/shaders/1.40 )
 
 #######################################
 # Config

effects/invert/data/1.40/invert.frag

@@ -0,0 +1,25 @@
+#version 140
+uniform sampler2D sampler;
+uniform vec4 modulation;
+uniform float saturation;
+
+in vec2 varyingTexCoords;
+
+out vec4 fragColor;
+
+void main()
+{
+    vec4 tex = texture(sampler, varyingTexCoords);
+
+    if (saturation != 1.0) {
+        vec3 desaturated = tex.rgb * vec3( 0.30, 0.59, 0.11 );
+        desaturated = vec3( dot( desaturated, tex.rgb ));
+        tex.rgb = tex.rgb * vec3( saturation ) + desaturated * vec3( 1.0 - saturation );
+    }
+
+    tex *= modulation;
+    tex.rgb = vec3(1.0) - tex.rgb;
+    tex.rgb *= tex.a;
+
+    fragColor = tex;
+}

effects/invert/invert.cpp

@@ -72,7 +72,12 @@ bool InvertEffect::loadData()
 {
     m_inited = true;
 
-    const QString fragmentshader =  KGlobal::dirs()->findResource("data", "kwin/invert.frag");
+    QString shadersDir = "kwin/shaders/1.10/";
+#ifndef KWIN_HAVE_OPENGLES
+    if (GLPlatform::instance()->glslVersion() >= kVersionNumber(1, 40))
+        shadersDir = "kwin/shaders/1.40/";
+#endif
+    const QString fragmentshader =  KGlobal::dirs()->findResource("data", shadersDir + "invert.frag");
 
     m_shader = ShaderManager::instance()->loadFragmentShader(ShaderManager::GenericShader, fragmentshader);
     if (!m_shader->isValid()) {