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Code Issues

Codechange: consider vehicle co-ordinates when identifying viewport candidate as using only the hash generates false positives

pull/8496/head
Matt Kimber 2021-01-03 14:02:53 +00:00 committed by Patric Stout
parent 9b28b15e67
commit 5728f9c7d0
2 changed files with 19 additions and 13 deletions
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22
src/vehicle.cpp
View File

@ -1124,11 +1124,15 @@ void ViewportAddVehicles(DrawPixelInfo *dpi)
const int t = dpi->top;
const int b = dpi->top + dpi->height;
/* Border size of MAX_VEHICLE_PIXEL_xy */
const int xb = MAX_VEHICLE_PIXEL_X * ZOOM_LVL_BASE;
const int yb = MAX_VEHICLE_PIXEL_Y * ZOOM_LVL_BASE;
/* The hash area to scan */
int xl, xu, yl, yu;
if (dpi->width + (MAX_VEHICLE_PIXEL_X * ZOOM_LVL_BASE) < GEN_HASHX_SIZE) {
xl = GEN_HASHX(l - MAX_VEHICLE_PIXEL_X * ZOOM_LVL_BASE);
if (dpi->width + xb < GEN_HASHX_SIZE) {
xl = GEN_HASHX(l - xb);
xu = GEN_HASHX(r);
} else {
/* scan whole hash row */
@ -1136,8 +1140,8 @@ void ViewportAddVehicles(DrawPixelInfo *dpi)
xu = GEN_HASHX_MASK;
}
if (dpi->height + (MAX_VEHICLE_PIXEL_Y * ZOOM_LVL_BASE) < GEN_HASHY_SIZE) {
yl = GEN_HASHY(t - MAX_VEHICLE_PIXEL_Y * ZOOM_LVL_BASE);
if (dpi->height + yb < GEN_HASHY_SIZE) {
yl = GEN_HASHY(t - yb);
yu = GEN_HASHY(b);
} else {
/* scan whole column */
@ -1158,9 +1162,14 @@ void ViewportAddVehicles(DrawPixelInfo *dpi)
b >= v->coord.top) {
DoDrawVehicle(v);
}
else {
else if (l <= v->coord.right + xb &&
t <= v->coord.bottom + yb &&
r >= v->coord.left - xb &&
b >= v->coord.top - yb)
{
/*
* Indicate that this vehicle was considered for rendering in a viewport,
* is within the bounds where a sprite could be valid for rendering
* and we therefore need to update sprites more frequently in case a callback
* will change the bounding box to one which will cause the sprite to be
* displayed.
@ -1168,9 +1177,6 @@ void ViewportAddVehicles(DrawPixelInfo *dpi)
* This reduces the chances of flicker when sprites enter the screen, if they
* are part of a newgrf vehicle set which changes bounding boxes within a
* single vehicle direction.
*
* TODO: this will consider too many false positives, use the bounding box
* information or something which better narrows down the candidates.
*/
v->sprite_cache.is_viewport_candidate = true;
}

10
src/vehicle_base.h
View File

@ -186,10 +186,10 @@ struct VehicleSpriteSeq {
* or calculating the viewport.
*/
struct MutableSpriteCache {
Direction last_direction; ///< Last direction we obtained sprites for
mutable bool is_viewport_candidate; ///< The vehicle has been in the hash for a shown viewport recently
mutable bool sprite_has_viewport_changes; ///< There have been viewport changes since the sprite was last updated
mutable VehicleSpriteSeq sprite_seq; ///< Vehicle appearance.
Direction last_direction; ///< Last direction we obtained sprites for
bool is_viewport_candidate; ///< The vehicle has been in the hash for a shown viewport recently
bool sprite_has_viewport_changes; ///< There have been viewport changes since the sprite was last updated
VehicleSpriteSeq sprite_seq; ///< Vehicle appearance.
};
/** A vehicle pool for a little over 1 million vehicles. */
@ -337,7 +337,7 @@ public:
NewGRFCache grf_cache; ///< Cache of often used calculated NewGRF values
VehicleCache vcache; ///< Cache of often used vehicle values.
MutableSpriteCache sprite_cache; ///< Cache of sprites and values related to recalculating them, see #MutableSpriteCache
mutable MutableSpriteCache sprite_cache; ///< Cache of sprites and values related to recalculating them, see #MutableSpriteCache
Vehicle(VehicleType type = VEH_INVALID);