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invert two x,y loops for more efficient grid updating

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This commit is contained in:
fgenesis 2023-07-11 03:49:49 +02:00
parent d94219e91c
commit 6686080ddb
1 changed files with 30 additions and 24 deletions
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54
BBGE/RenderGrid.cpp
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@ -82,26 +82,31 @@ void RenderGrid::update(float dt)
{
gridTimer += dt * drawGridTimeMultiplier;
reset();
size_t hx = grid.width()/2;
for (size_t x = 0; x < grid.width(); x++)
const size_t w = grid.width();
const size_t h = grid.height();
size_t nx = w;
if(drawGridOut)
nx /= 2;
for (size_t y = 0; y < h; y++)
{
float yoffset = x * drawGridOffsetY;
float addY = 0;
if (drawGridModY != 0)
addY = cosf(gridTimer+yoffset)*drawGridModY;
for (size_t y = 0; y < grid.height(); y++)
{
float xoffset = y * drawGridOffsetX;
if (drawGridModX != 0)
Vector * const row = grid.row(y);
const float xoffset = y * drawGridOffsetX;
const float addx = sinf(gridTimer+xoffset)*drawGridModX;
size_t x;
for (x = 0; x < nx; x++)
row[x].x -= addx;
for (; x < w; x++)
row[x].x += addx;
if(const float dgmy = drawGridModY)
for (x = 0; x < w; x++)
{
float addX = (sinf(gridTimer+xoffset)*drawGridModX);
if (drawGridOut && x < hx)
grid(x,y).x += addX;
else
grid(x,y).x -= addX;
float yoffset = x * drawGridOffsetY;
row[x].y += cosf(gridTimer+yoffset)*dgmy;
}
grid(x,y).y += addY;
}
}
}
}
@ -155,16 +160,17 @@ void RenderGrid::setFromWavy(const Vector* wavy, size_t len, float width)
const size_t H = grid.height();
const float iw = 1.0f / width;
for (size_t x = 0; x < NX; x++) // TODO invert loop
for (size_t y = 0; y < H; y++)
{
for (size_t y = 0; y < H; y++)
const size_t wavy_y = (H - y)-1;
if (wavy_y < len)
{
const size_t wavy_y = (H - y)-1;
if (wavy_y < len)
const float tmp = wavy[wavy_y].x * iw;
Vector * const row = grid.row(y);
for (size_t x = 0; x < NX; x++)
{
const float tmp = wavy[wavy_y].x * iw;
grid(x,y).x = tmp - 0.5f;
grid(x+1,y).x = tmp + 0.5f;
row[x].x = tmp - 0.5f;
row[x+1].x = tmp + 0.5f;
}
}
}