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Render wall height offset

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This commit is contained in:
Miloslav Číž 2018-08-31 19:13:15 +02:00
parent fb3922a7ba
commit 50df4a40f4
1 changed files with 28 additions and 24 deletions
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52
raycastlib.h
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@ -485,37 +485,40 @@ void castRaysMultiHit(Camera cam, ArrayFunction arrayFunc,
}
PixelFunction _pixelFunction = 0;
ArrayFunction _arrayFunction = 0;
Camera _camera;
void _columnFunction(HitResult *hits, uint16_t hitCount, uint16_t x, Ray ray)
{
if (hitCount == 0)
return;
HitResult hit = hits[0];
Unit dist = // adjusted distance
(hit.distance * vectorsAngleCos(angleToDirection(_camera.direction),
ray.direction)) / UNITS_PER_SQUARE;
dist = dist == 0 ? 1 : dist; // prevent division by zero
int32_t height = perspectiveScale(50,dist,1);
Unit offset = perspectiveScale(_camera.height,dist,1);
uint32_t start = _camera.resolution.y / 2 - height / 2 + offset;
for (uint32_t i = start; i < start + height; ++i)
for (uint32_t j = 0; j < hitCount; ++j)
{
PixelInfo p;
HitResult hit = hits[j];
p.position.x = x;
p.position.y = i;
p.isWall = 1;
p.hit = hit;
Unit dist = // adjusted distance
(hit.distance * vectorsAngleCos(angleToDirection(_camera.direction),
ray.direction)) / UNITS_PER_SQUARE;
_pixelFunction(p);
dist = dist == 0 ? 1 : dist; // prevent division by zero
int32_t height = perspectiveScale(50,dist,1);
int16_t z = _arrayFunction(hit.square.x,hit.square.y) * 50;
Unit offset = perspectiveScale(_camera.height - z,dist,1);
uint32_t start = _camera.resolution.y / 2 - height / 2 + offset;
for (uint32_t i = start; i < start + height; ++i)
{
PixelInfo p;
p.position.x = x;
p.position.y = i;
p.isWall = 1;
p.hit = hit;
_pixelFunction(p);
}
}
}
@ -523,6 +526,7 @@ void render(Camera cam, ArrayFunction arrayFunc, PixelFunction pixelFunc,
RayConstraints constraints)
{
_pixelFunction = pixelFunc;
_arrayFunction = arrayFunc;
_camera = cam;
castRaysMultiHit(cam,arrayFunc,_columnFunction,constraints);
}