Initial commit

engines/ags/engine/gfx/blender.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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/>.
+ *
+ */
+
+#include "ags/engine/gfx/blender.h"
+#include "ags/lib/allegro.h"
+#include "ags/shared/core/types.h"
+
+namespace AGS3 {
+
+void set_my_trans_blender(int r, int g, int b, int a) {
+	// use standard allegro 15 and 16 bit blenders, but customize
+	// the 32-bit one to preserve the alpha channel
+	set_blender_mode(kAlphaPreservedBlenderMode, r, g, b, a);
+}
+
+void set_additive_alpha_blender() {
+	set_blender_mode(kAdditiveBlenderMode, 0, 0, 0, 0);
+}
+
+void set_argb2argb_blender(int alpha) {
+	set_blender_mode(kArgbToArgbBlender, 0, 0, 0, alpha);
+}
+
+void set_opaque_alpha_blender() {
+	set_blender_mode(kOpaqueBlenderMode, 0, 0, 0, 0);
+}
+
+void set_argb2any_blender() {
+	// TODO: Properly implement this new mode
+	set_blender_mode(kArgbToArgbBlender, 0, 0, 0, 0xff);
+}
+
+} // namespace AGS3