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Some comments and better names

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This commit is contained in:
disinvite 2023-10-02 23:25:41 -04:00
parent 7c6807de8f
commit 67a01d9ac3
2 changed files with 22 additions and 18 deletions
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36
LEGO1/mxtransitionmanager.cpp
View File

@ -59,25 +59,26 @@ void MxTransitionManager::Transition_Dissolve()
// If we are starting the animation
if (m_animationTimer == 0) {
// Populate
// Generate the list of columns in order...
for (int i = 0; i < 640; i++) {
m_pad36[i] = i;
m_columnOrder[i] = i;
}
// Randomize (sorta)
// ...then shuffle the list (to ensure that we hit each column once)
for (i = 0; i < 640; i++) {
int swap_ofs = rand() % 640;
undefined2 t = m_pad36[i];
m_pad36[i] = m_pad36[swap_ofs];
m_pad36[swap_ofs] = t;
int swap = rand() % 640;
MxU16 t = m_columnOrder[i];
m_columnOrder[i] = m_columnOrder[swap];
m_columnOrder[swap] = t;
}
// For each scanline, pick a random X offset
for (i = 0; i < 480; i++) {
m_pad536[i] = rand() % 640;
m_randomShift[i] = rand() % 640;
}
}
// Else run one tick of the animation
// Run one tick of the animation
DDSURFACEDESC ddsd;
memset(&ddsd, 0, sizeof(ddsd));
ddsd.dwSize = sizeof(ddsd);
@ -92,21 +93,24 @@ void MxTransitionManager::Transition_Dissolve()
FUN_1004c4d0(&ddsd);
for (int i = 0; i < 640; i++) {
if (m_animationTimer * 16 > m_pad36[i])
// Select 16 columns on each tick
if (m_animationTimer * 16 > m_columnOrder[i])
continue;
if (m_animationTimer * 16 + 15 < m_pad36[i])
if (m_animationTimer * 16 + 15 < m_columnOrder[i])
continue;
for (int j = 0; j < 480; j++) {
int jt = (m_pad536[j] + i) % 640;
// Shift the chosen column a different amount at each scanline.
// We use the same shift for that scanline each time.
// By the end, every pixel gets hit.
int ofs = (m_randomShift[j] + i) % 640;
// Set the chosen pixel to black
if (ddsd.ddpfPixelFormat.dwRGBBitCount == 8) {
MxU8 *pix = (MxU8*)ddsd.lpSurface;
pix[j * ddsd.lPitch + jt] = 0;
((MxU8*)ddsd.lpSurface)[j * ddsd.lPitch + ofs] = 0;
} else {
MxU16 *pix = (MxU16*)ddsd.lpSurface;
pix[j * ddsd.lPitch + jt] = 0;
((MxU16*)ddsd.lpSurface)[j * ddsd.lPitch + ofs] = 0;
}
}
}

4
LEGO1/mxtransitionmanager.h
View File

@ -107,8 +107,8 @@ class MxTransitionManager : public MxCore
TransitionType m_transitionType;
LPDIRECTDRAWSURFACE m_ddSurface;
MxU16 m_animationTimer;
undefined2 m_pad36[640]; // 0x36
undefined2 m_pad536[480]; // 0x536
MxU16 m_columnOrder[640]; // 0x36
MxU16 m_randomShift[480]; // 0x536
MxULong m_systemTime;
MxS32 m_animationSpeed;
};