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TilemapVX: Clean up the horrible map viewport calculation code 

Also rename "offset" to "origin" which makes a lot more sense
for ox/oy attributes.
This commit is contained in:
Jonas Kulla 2015-07-16 19:05:15 +02:00
parent 5aaeb0206c
commit dd7545fcf2
3 changed files with 36 additions and 47 deletions
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5
src/etc-internal.h
View File

@ -136,6 +136,11 @@ struct Vec2i
return Vec2i(x % value, y % value);
}
Vec2i operator&(unsigned value) const
{
return Vec2i(x & value, y & value);
}
Vec2i operator-() const
{
return Vec2i(-x, -y);

7
src/tilemap-common.h
View File

@ -46,6 +46,13 @@ wrap(int value, int range)
return res < 0 ? res + range : res;
}
static inline Vec2i
wrap(const Vec2i &value, int range)
{
return Vec2i(wrap(value.x, range),
wrap(value.y, range));
}
static inline int16_t
tableGetWrapped(const Table &t, int x, int y, int z = 0)
{

69
src/tilemapvx.cpp
View File

@ -57,12 +57,12 @@ struct TilemapVXPrivate : public ViewportElement, TileAtlasVX::Reader
Table *mapData;
Table *flags;
Vec2i offset;
Vec2i origin;
Vec2i dispPos;
/* Map viewport position */
/* Subregion of the map that is drawn to screen (map viewport) */
IntRect mapViewp;
Vec2i sceneOffset;
/* Position on screen the map subregion is drawn at */
Vec2i dispPos;
Scene::Geometry sceneGeo;
std::vector<SVertex> groundVert;
@ -179,48 +179,29 @@ struct TilemapVXPrivate : public ViewportElement, TileAtlasVX::Reader
TileAtlasVX::build(atlas, bitmaps);
}
void updatePosition()
{
dispPos = -(offset - mapViewp.pos() * 32) + sceneOffset;
}
void updateMapViewport()
{
int tileOX, tileOY;
IntRect newMvp;
Vec2i offs = offset + sceneGeo.orig;
const Vec2i combOrigin = origin + sceneGeo.orig;
const Vec2i geoSize = sceneGeo.rect.size();
if (offs.x >= 0)
tileOX = offs.x / 32;
else
tileOX = -(-(offs.x-31) / 32);
/* Round the combined origin (which is in pixels) down to the nearest
* top left tile boundary, by masking off the lower 5 bits (2^5 = 32) */
newMvp.setPos((combOrigin & ~(32-1)) / 32);
if (offs.y >= 0)
tileOY = offs.y / 32;
else
tileOY = -(-(offs.y-31) / 32);
/* Ensure that the size is big enough to cover the whole viewport,
* and add one tile row/column as a buffer for scrolling */
newMvp.setSize((geoSize / 32) + !!(geoSize % 32) + Vec2i(1));
bool dirty = false;
if (tileOX < mapViewp.x || tileOX > mapViewp.x)
{
mapViewp.x = tileOX;
dirty = true;
}
if (tileOY < mapViewp.y || tileOY > mapViewp.y)
{
mapViewp.y = tileOY;
dirty = true;
}
if (dirty)
if (newMvp != mapViewp)
{
mapViewp = newMvp;
flashMap.setViewport(newMvp);
buffersDirty = true;
}
updatePosition();
flashMap.setViewport(mapViewp);
dispPos = sceneGeo.rect.pos() - wrap(combOrigin, 32);
}
static size_t quadBytes(size_t quads)
@ -365,10 +346,6 @@ struct TilemapVXPrivate : public ViewportElement, TileAtlasVX::Reader
void onGeometryChange(const Scene::Geometry &geo)
{
const Vec2i geoSize = geo.rect.size();
mapViewp.setSize((geoSize / 32) + !!(geoSize % 32) + Vec2i(1));
sceneOffset = geo.offset();
sceneGeo = geo;
buffersDirty = true;
@ -466,8 +443,8 @@ TilemapVX::BitmapArray &TilemapVX::getBitmapArray()
DEF_ATTR_RD_SIMPLE(TilemapVX, MapData, Table*, p->mapData)
DEF_ATTR_RD_SIMPLE(TilemapVX, FlashData, Table*, p->flashMap.getData())
DEF_ATTR_RD_SIMPLE(TilemapVX, Flags, Table*, p->flags)
DEF_ATTR_RD_SIMPLE(TilemapVX, OX, int, p->offset.x)
DEF_ATTR_RD_SIMPLE(TilemapVX, OY, int, p->offset.y)
DEF_ATTR_RD_SIMPLE(TilemapVX, OX, int, p->origin.x)
DEF_ATTR_RD_SIMPLE(TilemapVX, OY, int, p->origin.y)
Viewport *TilemapVX::getViewport() const
{
@ -540,10 +517,10 @@ void TilemapVX::setOX(int value)
{
guardDisposed();
if (p->offset.x == value)
if (p->origin.x == value)
return;
p->offset.x = value;
p->origin.x = value;
p->mapViewportDirty = true;
}
@ -551,10 +528,10 @@ void TilemapVX::setOY(int value)
{
guardDisposed();
if (p->offset.y == value)
if (p->origin.y == value)
return;
p->offset.y = value;
p->origin.y = value;
p->mapViewportDirty = true;
}