started pair of transition derivatives

These will serve as stock transitions and as a reference implementation for
hardware accelerated transitions.

app/node/block/transition/crossdissolve/CMakeLists.txt

@@ -0,0 +1,22 @@
+# Olive - Non-Linear Video Editor
+# Copyright (C) 2019 Olive Team
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set(OLIVE_SOURCES
+  ${OLIVE_SOURCES}
+  node/block/transition/crossdissolve/crossdissolve.h
+  node/block/transition/crossdissolve/crossdissolve.cpp
+  PARENT_SCOPE
+)

app/node/block/transition/crossdissolve/crossdissolve.cpp

@@ -0,0 +1,54 @@
+#include "crossdissolve.h"
+
+CrossDissolveTransition::CrossDissolveTransition()
+{
+
+}
+
+Node *CrossDissolveTransition::copy() const
+{
+  return new CrossDissolveTransition();
+}
+
+QString CrossDissolveTransition::Name() const
+{
+  return tr("Cross Dissolve");
+}
+
+QString CrossDissolveTransition::id() const
+{
+  return "org.olivevideoeditor.Olive.crossdissolve";
+}
+
+QString CrossDissolveTransition::Description() const
+{
+  return tr("A smooth fade transition from one video clip to another.");
+}
+
+bool CrossDissolveTransition::IsAccelerated() const
+{
+  return true;
+}
+
+QString CrossDissolveTransition::CodeFragment() const
+{
+  return "#version 110\n"
+         "\n"
+         "varying vec2 ove_texcoord;\n"
+         "\n"
+         "uniform sampler2D out_block_in;\n"
+         "uniform sampler2D in_block_in;\n"
+         "\n"
+         "uniform float transition_total_prog;\n"
+         "uniform float transition_out_prog;\n"
+         "uniform float transition_in_prog;\n"
+         "\n"
+         "void main(void) {\n"
+         "  vec4 out_tex = texture2D(out_block_in, ove_texcoord);\n"
+         "  vec4 in_tex = texture2D(in_block_in, ove_texcoord);\n"
+         "  \n"
+         "  in_tex *= transition_total_prog;\n"
+         "  \n"
+         "  gl_FragColor = out_tex - in_tex.a + in_tex;\n"
+         "}\n";
+}

app/node/block/transition/crossdissolve/crossdissolve.h

@@ -0,0 +1,21 @@
+#ifndef CROSSDISSOLVETRANSITION_H
+#define CROSSDISSOLVETRANSITION_H
+
+#include "../transition.h"
+
+class CrossDissolveTransition : public TransitionBlock
+{
+public:
+  CrossDissolveTransition();
+
+  virtual Node* copy() const override;
+
+  virtual QString Name() const override;
+  virtual QString id() const override;
+  virtual QString Description() const override;
+
+  virtual bool IsAccelerated() const override;
+  virtual QString CodeFragment() const override;
+};
+
+#endif // CROSSDISSOLVETRANSITION_H

app/node/block/transition/diptoblack/CMakeLists.txt

@@ -0,0 +1,22 @@
+# Olive - Non-Linear Video Editor
+# Copyright (C) 2019 Olive Team
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set(OLIVE_SOURCES
+  ${OLIVE_SOURCES}
+  node/block/transition/diptoblack/diptoblack.h
+  node/block/transition/diptoblack/diptoblack.cpp
+  PARENT_SCOPE
+)

app/node/block/transition/diptoblack/diptoblack.cpp

@@ -0,0 +1,6 @@
+#include "diptoblack.h"
+
+DipToBlackTransition::DipToBlackTransition()
+{
+
+}

app/node/block/transition/diptoblack/diptoblack.h

@@ -0,0 +1,12 @@
+#ifndef DIPTOBLACKTRANSITION_H
+#define DIPTOBLACKTRANSITION_H
+
+#include "../transition.h"
+
+class DipToBlackTransition : public TransitionBlock
+{
+public:
+  DipToBlackTransition();
+};
+
+#endif // DIPTOBLACKTRANSITION_H