diff options
author | Colin Snover | 2016-01-06 20:00:28 -0600 |
---|---|---|
committer | Colin Snover | 2016-01-07 16:35:09 -0600 |
commit | aeee621e4413fe71ffada6c4bc096ae2a5a8c204 (patch) | |
tree | 41817ee3e96fcc279988bb5e604553694e2737ba /engines/sci/graphics/palette32.cpp | |
parent | 453afd7bbc7b83506638bf87b830384078f729e1 (diff) | |
download | scummvm-rg350-aeee621e4413fe71ffada6c4bc096ae2a5a8c204.tar.gz scummvm-rg350-aeee621e4413fe71ffada6c4bc096ae2a5a8c204.tar.bz2 scummvm-rg350-aeee621e4413fe71ffada6c4bc096ae2a5a8c204.zip |
SCI32: Add initial support for palette cycling (kPalCycle) and fading (kPalFade)
Graphics palette code was rewritten between SCI1 and SCI2, so
SCI32 palette engine code has been moved to a separate GfxPalette32
class.
Diffstat (limited to 'engines/sci/graphics/palette32.cpp')
-rw-r--r-- | engines/sci/graphics/palette32.cpp | 350 |
1 files changed, 350 insertions, 0 deletions
diff --git a/engines/sci/graphics/palette32.cpp b/engines/sci/graphics/palette32.cpp new file mode 100644 index 0000000000..61ca1b99c2 --- /dev/null +++ b/engines/sci/graphics/palette32.cpp @@ -0,0 +1,350 @@ +/* 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 2 + * 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, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +#include "common/file.h" + +#include "sci/sci.h" +#include "sci/graphics/palette32.h" + +namespace Sci { + +GfxPalette32::GfxPalette32(ResourceManager *resMan, GfxScreen *screen) + : GfxPalette(resMan, screen), _clutTable(0), _cyclers(), _cycleMap() {} + +GfxPalette32::~GfxPalette32() { + unloadClut(); + cycleAllOff(); +} + +bool GfxPalette32::loadClut(uint16 clutId) { + // loadClut() will load a color lookup table from a clu file and set + // the palette found in the file. This is to be used with Phantasmagoria 2. + + unloadClut(); + + Common::String filename = Common::String::format("%d.clu", clutId); + Common::File clut; + + if (!clut.open(filename) || clut.size() != 0x10000 + 236 * 3) + return false; + + // Read in the lookup table + // It maps each RGB565 color to a palette index + _clutTable = new byte[0x10000]; + clut.read(_clutTable, 0x10000); + + Palette pal; + memset(&pal, 0, sizeof(Palette)); + + // Setup 1:1 mapping + for (int i = 0; i < 256; i++) { + pal.mapping[i] = i; + } + + // Now load in the palette + for (int i = 1; i <= 236; i++) { + pal.colors[i].used = 1; + pal.colors[i].r = clut.readByte(); + pal.colors[i].g = clut.readByte(); + pal.colors[i].b = clut.readByte(); + } + + set(&pal, true); + setOnScreen(); + return true; +} + +byte GfxPalette32::matchClutColor(uint16 color) { + // Match a color in RGB565 format to a palette index based on the loaded CLUT + assert(_clutTable); + return _clutTable[color]; +} + +void GfxPalette32::unloadClut() { + // This will only unload the actual table, but not reset any palette + delete[] _clutTable; + _clutTable = 0; +} + +inline void GfxPalette32::_clearCycleMap(const uint16 fromColor, const uint16 numColorsToClear) { + bool *mapEntry = _cycleMap + fromColor; + const bool *lastEntry = _cycleMap + numColorsToClear; + while (mapEntry < lastEntry) { + *mapEntry++ = false; + } +} + +inline void GfxPalette32::_setCycleMap(const uint16 fromColor, const uint16 numColorsToSet) { + bool *mapEntry = _cycleMap + fromColor; + const bool *lastEntry = _cycleMap + numColorsToSet; + while (mapEntry < lastEntry) { + if (*mapEntry != false) { + error("Cycles intersect"); + } + *mapEntry++ = true; + } +} + +inline PalCycler *GfxPalette32::_getCycler(const uint16 fromColor) { + const int numCyclers = ARRAYSIZE(_cyclers); + + for (int cyclerIndex = 0; cyclerIndex < numCyclers; ++cyclerIndex) { + PalCycler *cycler = _cyclers[cyclerIndex]; + if (cycler != nullptr && cycler->fromColor == fromColor) { + return cycler; + } + } + + return nullptr; +} + +inline void _doCycle(PalCycler *cycler, const int16 speed) { + int16 currentCycle = cycler->currentCycle; + const uint16 numColorsToCycle = cycler->numColorsToCycle; + + if (cycler->direction == 0) { + currentCycle = (currentCycle - (speed % numColorsToCycle)) + numColorsToCycle; + } else { + currentCycle = currentCycle + speed; + } + + cycler->currentCycle = (uint8) (currentCycle % numColorsToCycle); +} + +inline void _applyCycleToPalette(PalCycler *cycler, Palette *palette) { + const int16 currentCycle = cycler->currentCycle; + const uint16 numColorsToCycle = cycler->numColorsToCycle; + + Sci::Color tempPalette[numColorsToCycle]; + Sci::Color *sourceColor = palette->colors + cycler->fromColor; + memcpy(tempPalette, sourceColor, sizeof(tempPalette)); + + Sci::Color *targetColor = sourceColor; + for (int numColorsCycled = 0; numColorsCycled < numColorsToCycle; ++numColorsCycled) { + Sci::Color sourceColor = *(tempPalette + ((currentCycle + numColorsCycled) % numColorsToCycle)); + *(targetColor + numColorsCycled) = sourceColor; + } +} + +void GfxPalette32::applyAllCycles() { + for (int cyclerIndex = 0, numCyclers = ARRAYSIZE(_cyclers); cyclerIndex < numCyclers; ++cyclerIndex) { + PalCycler *cycler = _cyclers[cyclerIndex]; + if (cycler != nullptr) { + cycler->currentCycle = (uint8) ((((int) cycler->currentCycle) + 1) % cycler->numColorsToCycle); + // Disassembly was not fully evaluated to verify this is exactly the same + // as the code from applyCycles, but it appeared to be at a glance + _applyCycleToPalette(cycler, &_sysPalette); + } + } +} + +void GfxPalette32::applyCycles() { + for (int i = 0, len = ARRAYSIZE(_cyclers); i < len; ++i) { + PalCycler *cycler = _cyclers[i]; + if (cycler == nullptr) { + continue; + } + + if (cycler->delay != 0 && cycler->numTimesPaused == 0) { + while ((cycler->delay + cycler->lastUpdateTick) < g_sci->getTickCount()) { + _doCycle(cycler, 1); + cycler->lastUpdateTick += cycler->delay; + } + } + + _applyCycleToPalette(cycler, &_sysPalette); + } +} + +int16 GfxPalette32::setCycle(const uint16 fromColor, const uint16 toColor, const int16 direction, const int16 delay) { + assert(fromColor <= UINT8_MAX); + assert(toColor <= UINT8_MAX); + assert(fromColor < toColor); + + int cyclerIndex; + const int numCyclers = ARRAYSIZE(_cyclers); + + PalCycler *cycler = _getCycler(fromColor); + + if (cycler != nullptr) { + debug("Resetting existing cycler"); + _clearCycleMap(fromColor, cycler->numColorsToCycle); + } else { + for (cyclerIndex = 0; cyclerIndex < numCyclers; ++cyclerIndex) { + if (_cyclers[cyclerIndex] == nullptr) { + cycler = new PalCycler; + _cyclers[cyclerIndex] = cycler; + break; + } + } + } + + // SCI engine overrides the first oldest cycler that it finds where + // “oldest” is determined by the difference between the tick and now + if (cycler == nullptr) { + int maxUpdateDelta = -1; + // Optimization: Unlike actual SCI (SQ6) engine, we call + // getTickCount only once and store it, instead of calling it + // twice on each iteration through the loop + const uint32 now = g_sci->getTickCount(); + + for (cyclerIndex = 0; cyclerIndex < numCyclers; ++cyclerIndex) { + PalCycler *candidate = _cyclers[cyclerIndex]; + + const int32 updateDelta = now - candidate->lastUpdateTick; + if (updateDelta >= maxUpdateDelta) { + maxUpdateDelta = updateDelta; + cycler = candidate; + } + } + + _clearCycleMap(cycler->fromColor, cycler->numColorsToCycle); + } + + const uint16 numColorsToCycle = 1 + ((uint8) toColor) - fromColor; + cycler->fromColor = (uint8) fromColor; + cycler->numColorsToCycle = (uint8) numColorsToCycle; + cycler->currentCycle = (uint8) fromColor; + cycler->direction = direction < 0 ? PalCycleBackward : PalCycleForward; + cycler->delay = delay; + cycler->lastUpdateTick = g_sci->getTickCount(); + cycler->numTimesPaused = 0; + + _setCycleMap(fromColor, numColorsToCycle); + + // TODO: Validate that this is the correct return value according + // to disassembly + return 0; +} + +void GfxPalette32::doCycle(const uint16 fromColor, const int16 speed) { + PalCycler *cycler = _getCycler(fromColor); + if (cycler != nullptr) { + cycler->lastUpdateTick = g_sci->getTickCount(); + _doCycle(cycler, speed); + } +} + +void GfxPalette32::cycleOn(const uint16 fromColor) { + PalCycler *cycler = _getCycler(fromColor); + if (cycler != nullptr && cycler->numTimesPaused > 0) { + --cycler->numTimesPaused; + } +} + +void GfxPalette32::cyclePause(const uint16 fromColor) { + PalCycler *cycler = _getCycler(fromColor); + if (cycler != nullptr) { + ++cycler->numTimesPaused; + } +} + +void GfxPalette32::cycleAllOn() { + for (int i = 0, len = ARRAYSIZE(_cyclers); i < len; ++i) { + PalCycler *cycler = _cyclers[i]; + if (cycler != nullptr && cycler->numTimesPaused > 0) { + --cycler->numTimesPaused; + } + } +} + +void GfxPalette32::cycleAllPause() { + // TODO: The SCI SQ6 cycleAllPause function does not seem to perform + // nullptr checking?? This would definitely cause null pointer + // dereference in SCI code. I have not seen anything actually call + // this function yet, so it is possible it is just unused and broken + // in SCI SQ6. This assert exists so that if this function is called, + // it is noticed and can be rechecked in the actual engine. + // Obviously this code *does* do nullptr checks instead of crashing. :) + assert(0); + for (int i = 0, len = ARRAYSIZE(_cyclers); i < len; ++i) { + PalCycler *cycler = _cyclers[i]; + if (cycler != nullptr) { + // This seems odd, because currentCycle is 0..numColorsPerCycle, + // but fromColor is 0..255. When applyAllCycles runs, the values + // end up back in range + cycler->currentCycle = cycler->fromColor; + } + } + + applyAllCycles(); + + for (int i = 0, len = ARRAYSIZE(_cyclers); i < len; ++i) { + PalCycler *cycler = _cyclers[i]; + if (cycler != nullptr) { + ++cycler->numTimesPaused; + } + } +} + +void GfxPalette32::cycleOff(const uint16 fromColor) { + for (int i = 0, len = ARRAYSIZE(_cyclers); i < len; ++i) { + PalCycler *cycler = _cyclers[i]; + if (cycler != nullptr && cycler->fromColor == fromColor) { + _clearCycleMap(fromColor, cycler->numColorsToCycle); + delete cycler; + _cyclers[i] = nullptr; + break; + } + } +} + +void GfxPalette32::cycleAllOff() { + for (int i = 0, len = ARRAYSIZE(_cyclers); i < len; ++i) { + PalCycler *cycler = _cyclers[i]; + if (cycler != nullptr) { + _clearCycleMap(cycler->fromColor, cycler->numColorsToCycle); + delete cycler; + _cyclers[i] = nullptr; + } + } +} + +void GfxPalette32::applyFade() { + // TODO: Create and update a _nextPalette, not a single _sysPalette, to + // conform to the way the actual SCI32 engine works (writes to a + // next-frame-palette and then copies to the current palette on frameout) + Sci::Color *color = _sysPalette.colors; + uint8 *fadeAmount = _fadeTable; + for (int i = 0; i < 256; ++i) { + if (*fadeAmount == 100) { + continue; + } + + color->r = ((int) color->r * ((int) *fadeAmount)) / 100; + color->g = ((int) color->r * ((int) *fadeAmount)) / 100; + color->b = ((int) color->r * ((int) *fadeAmount)) / 100; + } +} + +void GfxPalette32::setFade(uint8 percent, uint16 fromColor, uint16 toColor) { + uint8 *fadeAmount = _fadeTable; + for (int i = fromColor, len = toColor - fromColor + 1; i < len; ++i) { + *fadeAmount++ = percent; + } +} + +void GfxPalette32::fadeOff() { + setFade(100, 0, 255); +} + +} |