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TSAGE: Implement original engine scene scrolling optimisations

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Wide screens are broken into 160x100 chunks. When scrolling, sections of the scene which have already been previously decoded for display can be reused, rather than re-decoding them from scratch
This commit is contained in:
Paul Gilbert 2011-03-19 14:20:15 +11:00
parent 9dad957454
commit 8246758e7e
1 changed files with 11 additions and 10 deletions
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21
engines/tsage/scenes.cpp
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@ -360,19 +360,20 @@ void Scene::refreshBackground(int xAmount, int yAmount) {
_enabledSections[xp * 16 + yp] = 0xffff;
} else {
// Check if the section is already loaded
// if (_enabledSections[xp * 16 + yp] || ((xAmount == 0) && (yAmount == 0))) {
if ((_enabledSections[xp * 16 + yp] == 0xffff) || ((xAmount == 0) && (yAmount == 0))) {
// Chunk isn't loaded, so load it in
Graphics::Surface s = _backSurface.lockSurface();
GfxSurface::loadScreenSection(s, xp - xHalfOffset, yp - yHalfOffset, xp, yp);
_backSurface.unlockSurface();
changedFlag = true;
/* } else {
int yv = _enabledSections[xp * 16 + yp] == ((xp - xHalfOffset) << 4) ? 0 : 1;
if (yv != (yp - yHalfOffset)) {
} else {
int yv = (_enabledSections[xp * 16 + yp] == ((xp - xHalfOffset) << 4)) ? 0 : 1;
if (yv | (yp - yHalfOffset)) {
// Copy an existing 160x100 screen section previously loaded
int xSectionSrc = xp - xHalfOffset;
int ySectionSrc = yp - yHalfOffset;
int xSectionDest = _enabledSections[xp * 16 + yp] >> 4;
int ySectionDest = _enabledSections[xp * 16 + yp] & 0xffff;
int xSectionDest = xp - xHalfOffset;
int ySectionDest = yp - yHalfOffset;
int xSectionSrc = _enabledSections[xp * 16 + yp] >> 4;
int ySectionSrc = _enabledSections[xp * 16 + yp] & 0xf;
Rect srcBounds(xSectionSrc * 160, ySectionSrc * 100,
(xSectionSrc + 1) * 160, (ySectionSrc + 1) * 100);
@ -381,10 +382,10 @@ void Scene::refreshBackground(int xAmount, int yAmount) {
_backSurface.copyFrom(_backSurface, srcBounds, destBounds);
}
}*/
}
_enabledSections[xp * 16 + yp] =
((xp - xHalfOffset) << 4) && (yp - yHalfOffset);
((xp - xHalfOffset) << 4) | (yp - yHalfOffset);
}
}
}