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Fix object rendering

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Previous solution did not work well on high resolutions due to
incorrect tile calculations - was not updating edges and sometimes
hanged in endless loop trying to find upper-left or bottom-right
tiles.

New solution follows Sfall's HRP implementation.
This commit is contained in:
Alexander Batalov 2023-01-05 05:59:45 +03:00
parent 7496afa4f8
commit ac64fde502
3 changed files with 25 additions and 37 deletions
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49
src/object.cc
View File

@ -768,47 +768,23 @@ void _obj_render_pre_roof(Rect* rect, int elevation)
int minY = updatedRect.top - 240;
int maxX = updatedRect.right + 320;
int maxY = updatedRect.bottom + 240;
int topLeftTile = tileFromScreenXY(minX, minY, elevation);
int upperLeftTile = tileFromScreenXY(minX, minY, elevation, true);
int updateAreaHexWidth = (maxX - minX + 1) / 32;
int updateAreaHexHeight = (maxY - minY + 1) / 12;
// On some maps (which were designed too close to edges) HRP brings a new
// problem - extended update rect (+/- 320/240 stuff above) may end up
// outside of the map edge. In this case `topLeftTile` will be -1 which
// affect all subsequent calculations. In order to fix that attempt to
// find closest valid tile.
while (!hexGridTileIsValid(topLeftTile)) {
minX += 32;
minY += 12;
topLeftTile = tileFromScreenXY(minX, minY, elevation);
}
// Do the same for the for bottom-right part of the extended update rect.
int bottomRightTile = tileFromScreenXY(maxX, maxY, elevation);
while (!hexGridTileIsValid(bottomRightTile)) {
maxX -= 32;
maxY -= 12;
bottomRightTile = tileFromScreenXY(maxX, maxY, elevation);
}
updateAreaHexWidth = (maxX - minX + 1) / 32;
updateAreaHexHeight = (maxY - minY + 1) / 12;
int parity = gCenterTile & 1;
int* orders = _orderTable[parity];
int* offsets = _offsetTable[parity];
_outlineCount = 0;
int renderCount = 0;
for (int i = 0; i < gObjectsUpdateAreaHexSize; i++) {
int offsetIndex = *orders++;
int offsetIndex = _orderTable[parity][i];
if (updateAreaHexHeight > _offsetDivTable[offsetIndex] && updateAreaHexWidth > _offsetModTable[offsetIndex]) {
int lightIntensity;
ObjectListNode* objectListNode = hexGridTileIsValid(topLeftTile + offsets[offsetIndex])
? gObjectListHeadByTile[topLeftTile + offsets[offsetIndex]]
int tile = upperLeftTile + _offsetTable[parity][offsetIndex];
ObjectListNode* objectListNode = hexGridTileIsValid(tile)
? gObjectListHeadByTile[tile]
: NULL;
int lightIntensity;
if (objectListNode != NULL) {
// NOTE: Calls `lightGetTileIntensity` twice.
lightIntensity = std::max(ambientIntensity, lightGetTileIntensity(elevation, objectListNode->obj->tile));
@ -2995,7 +2971,7 @@ int _obj_intersects_with(Object* object, int x, int y)
// 0x48C5C4
int _obj_create_intersect_list(int x, int y, int elevation, int objectType, ObjectWithFlags** entriesPtr)
{
int v5 = tileFromScreenXY(x - 320, y - 240, elevation);
int upperLeftTile = tileFromScreenXY(x - 320, y - 240, elevation, true);
*entriesPtr = NULL;
if (gObjectsUpdateAreaHexSize <= 0) {
@ -3006,9 +2982,12 @@ int _obj_create_intersect_list(int x, int y, int elevation, int objectType, Obje
int parity = gCenterTile & 1;
for (int index = 0; index < gObjectsUpdateAreaHexSize; index++) {
int v7 = _orderTable[parity][index];
if (_offsetDivTable[v7] < 30 && _offsetModTable[v7] < 20) {
ObjectListNode* objectListNode = gObjectListHeadByTile[_offsetTable[parity][v7] + v5];
int offsetIndex = _orderTable[parity][index];
if (_offsetDivTable[offsetIndex] < 30 && _offsetModTable[offsetIndex] < 20) {
int tile = _offsetTable[parity][offsetIndex] + upperLeftTile;
ObjectListNode* objectListNode = hexGridTileIsValid(tile)
? gObjectListHeadByTile[tile]
: NULL;
while (objectListNode != NULL) {
Object* object = objectListNode->obj;
if (object->elevation > elevation) {

11
src/tile.cc
View File

@ -692,8 +692,13 @@ int tileToScreenXY(int tile, int* screenX, int* screenY, int elevation)
return 0;
}
// CE: Added optional `ignoreBounds` param to return tile number without
// validating hex grid bounds. The resulting invalid tile number serves as an
// origin for calculations using prepared offsets table during objects
// rendering.
//
// 0x4B1754
int tileFromScreenXY(int screenX, int screenY, int elevation)
int tileFromScreenXY(int screenX, int screenY, int elevation, bool ignoreBounds)
{
int v2;
int v3;
@ -763,6 +768,10 @@ int tileFromScreenXY(int screenX, int screenY, int elevation)
return gHexGridWidth * v10 + v12;
}
if (ignoreBounds) {
return gHexGridWidth * v10 + v12;
}
return -1;
}

2
src/tile.h
View File

@ -28,7 +28,7 @@ void tileWindowRefresh();
int tileSetCenter(int tile, int flags);
int tileRoofIsVisible();
int tileToScreenXY(int tile, int* x, int* y, int elevation);
int tileFromScreenXY(int x, int y, int elevation);
int tileFromScreenXY(int x, int y, int elevation, bool ignoreBounds = false);
int tileDistanceBetween(int a1, int a2);
bool tileIsInFrontOf(int tile1, int tile2);
bool tileIsToRightOf(int tile1, int tile2);