mirror of
https://github.com/libretro/scummvm.git
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147 lines
3.6 KiB
C++
147 lines
3.6 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef GRAPHICS_TINYGL_COLORMASKS_H
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#define GRAPHICS_TINYGL_COLORMASKS_H
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#include "graphics/tinygl/gl.h"
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namespace TinyGL {
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template<uint Format, uint Type>
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struct ColorMasks {
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};
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template<>
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struct ColorMasks<TGL_RGB, TGL_UNSIGNED_SHORT_5_6_5> {
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enum : uint {
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kBytesPerPixel = 2,
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kAlphaBits = 0,
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kRedBits = 5,
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kGreenBits = 6,
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kBlueBits = 5,
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kAlphaShift = 0,
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kRedShift = kGreenBits+kBlueBits,
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kGreenShift = kBlueBits,
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kBlueShift = 0,
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask,
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};
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typedef uint16 PixelType;
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};
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template<>
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struct ColorMasks<TGL_RGBA, TGL_UNSIGNED_SHORT_5_5_5_1> {
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enum {
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kBytesPerPixel = 2,
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kAlphaBits = 1,
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kRedBits = 5,
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kGreenBits = 5,
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kBlueBits = 5,
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kAlphaShift = 0,
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kRedShift = kGreenBits+kBlueBits+kAlphaBits,
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kGreenShift = kBlueBits+kAlphaBits,
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kBlueShift = kAlphaBits,
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask
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};
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typedef uint16 PixelType;
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};
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template<>
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struct ColorMasks<TGL_RGBA, TGL_UNSIGNED_SHORT_4_4_4_4> {
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enum {
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kBytesPerPixel = 2,
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kAlphaBits = 4,
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kRedBits = 4,
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kGreenBits = 4,
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kBlueBits = 4,
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kAlphaShift = 0,
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kRedShift = kGreenBits+kBlueBits+kAlphaBits,
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kGreenShift = kBlueBits+kAlphaBits,
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kBlueShift = kAlphaBits,
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask
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};
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typedef uint16 PixelType;
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};
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template<>
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struct ColorMasks<TGL_RGBA, TGL_UNSIGNED_BYTE> {
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enum {
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kBytesPerPixel = 4,
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kAlphaBits = 8,
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kRedBits = 8,
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kGreenBits = 8,
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kBlueBits = 8,
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#if defined(SCUMM_LITTLE_ENDIAN)
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kAlphaShift = kRedBits+kGreenBits+kBlueBits,
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kRedShift = 0,
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kGreenShift = kRedBits,
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kBlueShift = kRedBits+kGreenBits,
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#else
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kAlphaShift = 0,
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kRedShift = kGreenBits+kBlueBits+kAlphaBits,
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kGreenShift = kBlueBits+kAlphaBits,
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kBlueShift = kAlphaBits,
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#endif
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kAlphaMask = ((1 << kAlphaBits) - 1) << kAlphaShift,
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kRedMask = ((1 << kRedBits) - 1) << kRedShift,
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kGreenMask = ((1 << kGreenBits) - 1) << kGreenShift,
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kBlueMask = ((1 << kBlueBits) - 1) << kBlueShift,
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kRedBlueMask = kRedMask | kBlueMask,
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};
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typedef uint32 PixelType;
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};
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} // End of namespace Graphics
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#endif
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