Initial commit

graphics/tinygl/colormasks.h

@@ -0,0 +1,146 @@
+/* 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/>.
+ *
+ */
+
+#ifndef GRAPHICS_TINYGL_COLORMASKS_H
+#define GRAPHICS_TINYGL_COLORMASKS_H
+
+#include "graphics/tinygl/gl.h"
+
+namespace TinyGL {
+
+template<uint Format, uint Type>
+struct ColorMasks {
+};
+
+template<>
+struct ColorMasks<TGL_RGB, TGL_UNSIGNED_SHORT_5_6_5> {
+	enum : uint {
+		kBytesPerPixel = 2,
+
+		kAlphaBits  = 0,
+		kRedBits    = 5,
+		kGreenBits  = 6,
+		kBlueBits   = 5,
+
+		kAlphaShift = 0,
+		kRedShift   = kGreenBits+kBlueBits,
+		kGreenShift = kBlueBits,
+		kBlueShift  = 0,
+
+		kAlphaMask  = ((1 << kAlphaBits) - 1) << kAlphaShift,
+		kRedMask    = ((1 << kRedBits) - 1) << kRedShift,
+		kGreenMask  = ((1 << kGreenBits) - 1) << kGreenShift,
+		kBlueMask   = ((1 << kBlueBits) - 1) << kBlueShift,
+
+		kRedBlueMask = kRedMask | kBlueMask,
+	};
+
+	typedef uint16 PixelType;
+};
+
+template<>
+struct ColorMasks<TGL_RGBA, TGL_UNSIGNED_SHORT_5_5_5_1> {
+	enum {
+		kBytesPerPixel = 2,
+
+		kAlphaBits  = 1,
+		kRedBits    = 5,
+		kGreenBits  = 5,
+		kBlueBits   = 5,
+
+		kAlphaShift = 0,
+		kRedShift   = kGreenBits+kBlueBits+kAlphaBits,
+		kGreenShift = kBlueBits+kAlphaBits,
+		kBlueShift  = kAlphaBits,
+
+		kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
+		kRedMask   = ((1 << kRedBits) - 1) << kRedShift,
+		kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
+		kBlueMask  = ((1 << kBlueBits) - 1) << kBlueShift,
+
+		kRedBlueMask = kRedMask | kBlueMask
+	};
+
+	typedef uint16 PixelType;
+};
+
+template<>
+struct ColorMasks<TGL_RGBA, TGL_UNSIGNED_SHORT_4_4_4_4> {
+	enum {
+		kBytesPerPixel = 2,
+
+		kAlphaBits  = 4,
+		kRedBits    = 4,
+		kGreenBits  = 4,
+		kBlueBits   = 4,
+
+		kAlphaShift = 0,
+		kRedShift   = kGreenBits+kBlueBits+kAlphaBits,
+		kGreenShift = kBlueBits+kAlphaBits,
+		kBlueShift  = kAlphaBits,
+
+		kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
+		kRedMask   = ((1 << kRedBits) - 1) << kRedShift,
+		kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
+		kBlueMask  = ((1 << kBlueBits) - 1) << kBlueShift,
+
+		kRedBlueMask = kRedMask | kBlueMask
+	};
+
+	typedef uint16 PixelType;
+};
+
+template<>
+struct ColorMasks<TGL_RGBA, TGL_UNSIGNED_BYTE> {
+	enum {
+		kBytesPerPixel = 4,
+
+		kAlphaBits  = 8,
+		kRedBits    = 8,
+		kGreenBits  = 8,
+		kBlueBits   = 8,
+
+#if defined(SCUMM_LITTLE_ENDIAN)
+		kAlphaShift = kRedBits+kGreenBits+kBlueBits,
+		kRedShift   = 0,
+		kGreenShift = kRedBits,
+		kBlueShift  = kRedBits+kGreenBits,
+#else
+		kAlphaShift = 0,
+		kRedShift   = kGreenBits+kBlueBits+kAlphaBits,
+		kGreenShift = kBlueBits+kAlphaBits,
+		kBlueShift  = kAlphaBits,
+#endif
+
+		kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
+		kRedMask   = ((1 << kRedBits) - 1) << kRedShift,
+		kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
+		kBlueMask  = ((1 << kBlueBits) - 1) << kBlueShift,
+
+		kRedBlueMask = kRedMask | kBlueMask,
+	};
+
+	typedef uint32 PixelType;
+};
+
+} // End of namespace Graphics
+
+#endif