From efb82daf30324a91ec638e4e8358b6e2abbe6430 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Gr=C3=A4=C3=9Flin?= <kde@martin-graesslin.com>
Date: Sat, 1 Jan 2011 18:55:51 +0100
Subject: [PATCH] Adding high-level method for glLoadMatrix

---
 lib/kwinglutils.cpp | 16 ++++++++++++++++
 lib/kwinglutils.h   |  8 ++++++++
 2 files changed, 24 insertions(+)

diff --git a/lib/kwinglutils.cpp b/lib/kwinglutils.cpp
index fc82b2c54a..3338919a9e 100644
--- a/lib/kwinglutils.cpp
+++ b/lib/kwinglutils.cpp
@@ -351,6 +351,22 @@ void multiplyMatrix(const QMatrix4x4 &matrix)
 #endif
 }
 
+void loadMatrix(const QMatrix4x4 &matrix)
+{
+#ifdef KWIN_HAVE_OPENGLES
+    Q_UNUSED(matrix)
+#else
+    GLfloat m[16];
+    const qreal *data = matrix.constData();
+    for (int i = 0; i < 4; ++i) {
+        for (int j=0; j < 4; ++j) {
+            m[i*4+j] = data[i*4+j];
+        }
+    }
+    glLoadMatrixf(m);
+#endif
+}
+
 void popMatrix()
 {
 #ifndef KWIN_HAVE_OPENGLES
diff --git a/lib/kwinglutils.h b/lib/kwinglutils.h
index e50deab132..4897a9f42a 100644
--- a/lib/kwinglutils.h
+++ b/lib/kwinglutils.h
@@ -151,6 +151,14 @@ KWIN_EXPORT void pushMatrix(const QMatrix4x4 &matrix);
  * @since 4.7
  **/
 KWIN_EXPORT void multiplyMatrix(const QMatrix4x4 &matrix);
+/**
+ * Replaces the current matrix on GL stack with @p matrix.
+ * In GLES this method is a no-op. This method should be preferred over glLoadMatrix
+ * as it also handles GLES.
+ * @param matrix The new matrix to replace the existing one on the GL stack.
+ * @since 4.7
+ **/
+KWIN_EXPORT void loadMatrix(const QMatrix4x4 &matrix);
 /**
  * Pops the current matrix from the GL matrix stack.
  * In GLES this method is a noop. This method should be preferred over glPopMatrix