Add a demo/test effect for GLRenderTarget.

It renders a small rotating thumbnail of the scene in the middle of the screen.

svn path=/branches/work/kwin_composite/; revision=655498

effects/CMakeLists.txt

@@ -44,11 +44,16 @@ if(OPENGL_FOUND)
         trackmouse.cpp
         wavywindows.cpp
         )
+    SET(kwin4_effect_tests_sources ${kwin4_effect_tests_sources}
+        test_fbo.cpp
+        )
+
     install( FILES
         magnifier.desktop
         shadow.desktop
         trackmouse.desktop
         wavywindows.desktop
+        test_fbo.desktop
         DESTINATION ${DATA_INSTALL_DIR}/kwin/effects )
 
     install( FILES

effects/test_fbo.cpp

@@ -0,0 +1,102 @@
+/*****************************************************************
+ KWin - the KDE window manager
+ This file is part of the KDE project.
+
+Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
+
+You can Freely distribute this program under the GNU General Public
+License. See the file "COPYING" for the exact licensing terms.
+******************************************************************/
+
+
+#include "test_fbo.h"
+
+#include <kwinglutils.h>
+
+
+namespace KWin
+{
+
+KWIN_EFFECT( Test_FBO, TestFBOEffect );
+KWIN_EFFECT_SUPPORTED( Test_FBO, TestFBOEffect::supported() );
+
+
+TestFBOEffect::TestFBOEffect() : Effect()
+    {
+    mRot = 0.0f;
+
+    // Create texture and render target
+    mTexture = new GLTexture(displayWidth(), displayHeight());
+    mTexture->setFilter(GL_LINEAR_MIPMAP_LINEAR);
+
+    mRenderTarget = new GLRenderTarget(mTexture);
+
+    mValid = mRenderTarget->valid();
+    }
+
+bool TestFBOEffect::supported()
+    {
+    return hasGLExtension("GL_EXT_framebuffer_object") &&
+            (effects->compositingType() == OpenGLCompositing);
+    }
+
+
+void TestFBOEffect::prePaintScreen( int* mask, QRegion* region, int time )
+    {
+    if(mValid)
+        {
+        *mask |= PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
+        // Start rendering to texture
+        mRenderTarget->enable();
+        }
+
+    effects->prePaintScreen(mask, region, time);
+    }
+
+void TestFBOEffect::postPaintScreen()
+    {
+    // Call the next effect.
+    effects->postPaintScreen();
+
+    if(mValid)
+        {
+        // Disable render texture
+        mRenderTarget->disable();
+        mTexture->bind();
+
+        // Render fullscreen quad with screen contents
+        glBegin(GL_QUADS);
+            glTexCoord2f(0.0, 0.0); glVertex2f(0.0, displayHeight());
+            glTexCoord2f(1.0, 0.0); glVertex2f(displayWidth(), displayHeight());
+            glTexCoord2f(1.0, 1.0); glVertex2f(displayWidth(), 0.0);
+            glTexCoord2f(0.0, 1.0); glVertex2f(0.0, 0.0);
+        glEnd();
+
+        // Render rotated screen thumbnail
+        mRot += 0.5f;
+        glTranslatef(displayWidth()/2.0f, displayHeight()/2.0f, 0.0f);
+        glRotatef(mRot, 0.0, 0.0, 1.0);
+        glScalef(0.2, 0.2, 0.2);
+        glTranslatef(-displayWidth()/2.0f, -displayHeight()/2.0f, 0.0f);
+
+        glBegin(GL_QUADS);
+            glTexCoord2f(0.0, 0.0); glVertex2f(0.0, displayHeight());
+            glTexCoord2f(1.0, 0.0); glVertex2f(displayWidth(), displayHeight());
+            glTexCoord2f(1.0, 1.0); glVertex2f(displayWidth(), 0.0);
+            glTexCoord2f(0.0, 1.0); glVertex2f(0.0, 0.0);
+        glEnd();
+
+        // Reset matrix and unbind texture
+        glLoadIdentity();
+
+        mTexture->unbind();
+
+        // Make sure the animation continues
+        effects->addRepaintFull();
+        }
+
+    }
+
+
+} // namespace
+

effects/test_fbo.desktop

@@ -0,0 +1,4 @@
+[Desktop Entry]
+Encoding=UTF-8
+Name=Test_FBO
+X-KDE-Library=kwin4_effect_tests

effects/test_fbo.h

@@ -0,0 +1,51 @@
+/*****************************************************************
+ KWin - the KDE window manager
+ This file is part of the KDE project.
+
+Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
+
+You can Freely distribute this program under the GNU General Public
+License. See the file "COPYING" for the exact licensing terms.
+******************************************************************/
+
+#ifndef KWIN_TESTFBOEFFECT_H
+#define KWIN_TESTFBOEFFECT_H
+
+// Include with base class for effects.
+#include <kwineffects.h>
+
+namespace KWin
+{
+
+class GLRenderTarget;
+class GLTexture;
+
+/**
+ * Demonstrates usage of GLRenderTarget by first rendering the scene onto a
+ *  texture and then rendering a small rotating thumbnail of the entire scene
+ *  on top of the usual scene.
+ **/
+class TestFBOEffect : public Effect
+    {
+    public:
+        TestFBOEffect();
+
+        virtual void prePaintScreen( int* mask, QRegion* region, int time );
+        virtual void postPaintScreen();
+
+        static bool supported();
+
+    protected:
+        bool loadData();
+
+    private:
+        GLTexture* mTexture;
+        GLRenderTarget* mRenderTarget;
+        bool mValid;
+
+        float mRot;
+    };
+
+} // namespace
+
+#endif