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MYST3: Implement the resonance rings effect

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This commit is contained in:
Bastien Bouclet 2014-03-15 10:49:36 +01:00
parent d495731508
commit c25069b110
2 changed files with 41 additions and 1 deletions
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38
engines/myst3/effects.cpp
View File

@ -291,6 +291,7 @@ MagnetEffect::MagnetEffect(Myst3Engine *vm) :
_lastSoundId(0),
_lastTime(0),
_position(0),
_lastAmpl(0),
_shakeStrength(nullptr) {
}
@ -346,6 +347,18 @@ bool MagnetEffect::update() {
_shakeStrength->seek(soundPosition, SEEK_SET);
_vm->_state->setMagnetEffectUnk3(_shakeStrength->readByte());
// Update the vertical displacements
float ampl = (_vm->_state->getMagnetEffectUnk1() + _vm->_state->getMagnetEffectUnk3())
/ (float)_vm->_state->getMagnetEffectUnk2();
if (ampl != _lastAmpl) {
for (uint i = 0; i < 256; i++) {
_verticalDisplacement[i] = sin(i * 2 * M_PI / 255.0) * ampl;
}
_lastAmpl = ampl;
}
// Update the position in the effect cycle
uint32 time = g_system->getMillis();
if (_lastTime) {
@ -369,7 +382,30 @@ void MagnetEffect::applyForFace(uint face, Graphics::Surface *src, Graphics::Sur
if (!mask)
error("No mask for face %d", face);
//TODO
apply(src, dst, mask, _position * 256.0);
}
void MagnetEffect::apply(Graphics::Surface *src, Graphics::Surface *dst, Graphics::Surface *mask, int32 position) {
uint32 *dstPtr = (uint32 *)dst->getPixels();
byte *maskPtr = (byte *)mask->getPixels();
for (uint y = 0; y < dst->h; y++) {
for (uint x = 0; x < dst->w; x++) {
uint8 maskValue = *maskPtr;
if (maskValue != 0) {
uint32 displacement = _verticalDisplacement[(maskValue + position) % 256];
uint32 srcValue1 = *(uint32 *) src->getBasePtr(x, y + displacement);
uint32 srcValue2 = *(uint32 *) src->getBasePtr(x, y);
*dstPtr = 0xFF000000 | ((0x007F7F7F & (srcValue1 >> 1)) + (0x007F7F7F & (srcValue2 >> 1)));
}
maskPtr++;
dstPtr++;
}
}
}
ShakeEffect::ShakeEffect(Myst3Engine *vm) :

4
engines/myst3/effects.h
View File

@ -97,11 +97,15 @@ public:
protected:
MagnetEffect(Myst3Engine *vm);
void apply(Graphics::Surface *src, Graphics::Surface *dst, Graphics::Surface *mask, int32 position);
int32 _lastSoundId;
Common::MemoryReadStream *_shakeStrength;
uint32 _lastTime;
float _position;
float _lastAmpl;
int32 _verticalDisplacement[256];
};
class ShakeEffect : public Effect {