From 5c22ffb5f2275173141ce63a1f6959d580c886cf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <kde@martin-graesslin.com>
Date: Wed, 8 Dec 2010 18:39:36 +0100
Subject: [PATCH] Resize effect ported to GLES

---
 effects/CMakeLists.txt    |  2 +-
 effects/resize/resize.cpp | 74 +++++++++++++++++++++++++++++++--------
 effects/resize/resize.h   |  7 ++++
 3 files changed, 68 insertions(+), 15 deletions(-)

diff --git a/effects/CMakeLists.txt b/effects/CMakeLists.txt
index 54178a2186..36db4ea2b1 100644
--- a/effects/CMakeLists.txt
+++ b/effects/CMakeLists.txt
@@ -70,6 +70,7 @@ include( magiclamp/CMakeLists.txt )
 include( translucency/CMakeLists.txt )
 include( minimizeanimation/CMakeLists.txt )
 include( presentwindows/CMakeLists.txt )
+include( resize/CMakeLists.txt )
 include( scalein/CMakeLists.txt )
 include( showpaint/CMakeLists.txt )
 include( slide/CMakeLists.txt )
@@ -80,7 +81,6 @@ include( thumbnailaside/CMakeLists.txt )
 include( windowgeometry/CMakeLists.txt )
 
 if( NOT KWIN_HAVE_OPENGLES_COMPOSITING )
-include( resize/CMakeLists.txt )
 include( logout/CMakeLists.txt )
 include( shadow/CMakeLists.txt )
 include( showfps/CMakeLists.txt )
diff --git a/effects/resize/resize.cpp b/effects/resize/resize.cpp
index 11d53825f9..637f95533b 100644
--- a/effects/resize/resize.cpp
+++ b/effects/resize/resize.cpp
@@ -21,7 +21,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "resize.h"
 
 #ifdef KWIN_HAVE_OPENGL_COMPOSITING
-#include <GL/gl.h>
+#include <kwinglutils.h>
 #endif
 #ifdef KWIN_HAVE_XRENDER_COMPOSITING
 #include <X11/Xlib.h>
@@ -29,6 +29,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #endif
 
 #include <KColorScheme>
+#include <QVector2D>
+#include <QVector4D>
 
 namespace KWin
 {
@@ -38,12 +40,42 @@ KWIN_EFFECT( resize, ResizeEffect )
 ResizeEffect::ResizeEffect()
     : m_active( false )
     , m_resizeWindow( 0 )
+    , m_useShader( false )
+#ifdef KWIN_HAVE_OPENGL_COMPOSITING
+    , m_vbo( 0 )
+    , m_colorShader( 0 )
+#endif
     {
     reconfigure( ReconfigureAll );
+#ifdef KWIN_HAVE_OPENGL_COMPOSITING
+    if (effects->compositingType() == OpenGLCompositing) {
+        m_vbo = new GLVertexBuffer(GLVertexBuffer::Stream);
+        m_vbo->setUseColor(true);
+        // TODO: use GLPlatform
+        if (GLShader::vertexShaderSupported() && GLShader::fragmentShaderSupported()) {
+            m_colorShader = new GLShader(":/resources/scene-color-vertex.glsl", ":/resources/scene-color-fragment.glsl");
+            if (m_colorShader->isValid()) {
+                m_colorShader->bind();
+                m_colorShader->setUniform("displaySize", QVector2D(displayWidth(), displayHeight()));
+                m_colorShader->setUniform("geometry", QVector4D(0, 0, 0, 0));
+                m_colorShader->unbind();
+                m_vbo->setUseShader(true);
+                m_useShader = true;
+                kDebug(1212) << "Show Paint Shader is valid";
+            } else {
+                kDebug(1212) << "Show Paint Shader not valid";
+            }
+        }
+    }
+#endif
     }
 
 ResizeEffect::~ResizeEffect()
     {
+#ifdef KWIN_HAVE_OPENGL_COMPOSITING
+    delete m_vbo;
+    delete m_colorShader;
+#endif
     }
 
 void ResizeEffect::prePaintScreen( ScreenPrePaintData& data, int time )
@@ -85,23 +117,37 @@ void ResizeEffect::paintWindow( EffectWindow* w, int mask, QRegion region, Windo
             QColor color = KColorScheme( QPalette::Normal, KColorScheme::Selection ).background().color();
 
 #ifdef KWIN_HAVE_OPENGL_COMPOSITING
-            if( effects->compositingType() == OpenGLCompositing)
-                {
+            if (effects->compositingType() == OpenGLCompositing) {
+#ifndef KWIN_HAVE_OPENGLES
                 glPushAttrib( GL_CURRENT_BIT | GL_ENABLE_BIT );
+#endif
+                if (m_useShader) {
+                    m_colorShader->bind();
+                }
                 glEnable( GL_BLEND );
                 glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
-                glColor4f( color.red() / 255.0f, color.green() / 255.0f, color.blue() / 255.0f, alpha );
-                glBegin( GL_QUADS );
-                foreach( const QRect &r, paintRegion.rects() )
-                    {
-                    glVertex2i( r.x(), r.y() );
-                    glVertex2i( r.x() + r.width(), r.y() );
-                    glVertex2i( r.x() + r.width(), r.y() + r.height() );
-                    glVertex2i( r.x(), r.y() + r.height() );
-                    }
-                glEnd();
-                glPopAttrib();
+                color.setAlphaF(alpha);
+                m_vbo->setColor(color);
+                QVector<float> verts;
+                verts.reserve(paintRegion.rects().count()*12);
+                foreach( const QRect &r, paintRegion.rects() ) {
+                    verts << r.x() + r.width() << r.y();
+                    verts << r.x() << r.y();
+                    verts << r.x() << r.y() + r.height();
+                    verts << r.x() << r.y() + r.height();
+                    verts << r.x() + r.width() << r.y() + r.height();
+                    verts << r.x() + r.width() << r.y();
                 }
+                m_vbo->setData(verts.count()/2, 2, verts.data(), NULL);
+                m_vbo->render(GL_TRIANGLES);
+                if (m_useShader) {
+                    m_colorShader->unbind();
+                }
+                glDisable(GL_BLEND);
+#ifndef KWIN_HAVE_OPENGLES
+                glPopAttrib();
+#endif
+            }
 #endif
 
 #ifdef KWIN_HAVE_XRENDER_COMPOSITING
diff --git a/effects/resize/resize.h b/effects/resize/resize.h
index 9575fbcd20..f3c54512e8 100644
--- a/effects/resize/resize.h
+++ b/effects/resize/resize.h
@@ -25,6 +25,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 namespace KWin
 {
+class GLShader;
+class GLVertexBuffer;
 
 class ResizeEffect
     : public Effect
@@ -46,6 +48,11 @@ class ResizeEffect
         int m_features;
         EffectWindow* m_resizeWindow;
         QRect m_currentGeometry, m_originalGeometry;
+        bool m_useShader;
+#ifdef KWIN_HAVE_OPENGL_COMPOSITING
+        GLVertexBuffer *m_vbo;
+        GLShader *m_colorShader;
+#endif
     };
 
 }