reimplemented transitions

effects/internal/crossdissolvetransition.cpp

@@ -0,0 +1,19 @@
+#include "../transition.h"
+
+#include <QOpenGLFunctions>
+
+// TODO port to GLSL?
+
+CrossDissolveTransition::CrossDissolveTransition() : Transition(VIDEO_DISSOLVE_TRANSITION) {}
+
+void CrossDissolveTransition::process_transition(double progress) {
+    float color[4];
+    glGetFloatv(GL_CURRENT_COLOR, color);
+	glColor4f(1.0, 1.0, 1.0, color[3]*progress);
+}
+
+Transition* CrossDissolveTransition::copy() {
+	Transition* t = new CrossDissolveTransition();
+	t->length = length;
+	return t;
+}