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Optimize floor precomputation

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This commit is contained in:
Miloslav Číž 2018-09-29 07:07:27 +02:00
parent 94a4fdb9ba
commit 228a247800
1 changed files with 9 additions and 4 deletions
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13
raycastlib.h
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@ -1538,13 +1538,18 @@ void _RCL_columnFunctionSimple(RCL_HitResult *hits, uint16_t hitCount,
-1,&ray,&p);
}
/**
Precomputes a distance from camera to the floor at each screen row into an
array (must be preallocated with sufficient (camera.resolution.y) length).
*/
static inline void _RCL_precomputeFloorDistances(RCL_Camera camera,
RCL_Unit *dest)
RCL_Unit *dest, uint16_t startIndex)
{
RCL_Unit camHeightScreenSize =
(camera.height * camera.resolution.y) / RCL_UNITS_PER_SQUARE;
for (uint16_t i = 0; i < camera.resolution.y; ++i)
for (uint16_t i = startIndex
; i < camera.resolution.y; ++i)
dest[i] = RCL_perspectiveScaleInverse(camHeightScreenSize,
RCL_absVal(i - _RCL_middleRow));
}
@ -1580,7 +1585,7 @@ void RCL_renderComplex(RCL_Camera cam, RCL_ArrayFunction floorHeightFunc,
#if RCL_COMPUTE_FLOOR_TEXCOORDS == 1
RCL_Unit floorPixelDistances[cam.resolution.y];
_RCL_precomputeFloorDistances(cam,floorPixelDistances);
_RCL_precomputeFloorDistances(cam,floorPixelDistances,0);
_RCL_floorPixelDistances = floorPixelDistances; // pass to column function
#endif
@ -1611,7 +1616,7 @@ void RCL_renderSimple(RCL_Camera cam, RCL_ArrayFunction floorHeightFunc,
#if RCL_COMPUTE_FLOOR_TEXCOORDS == 1
RCL_Unit floorPixelDistances[cam.resolution.y];
_RCL_precomputeFloorDistances(cam,floorPixelDistances);
_RCL_precomputeFloorDistances(cam,floorPixelDistances,_RCL_middleRow);
_RCL_floorPixelDistances = floorPixelDistances; // pass to column function
#endif