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Fix FOV

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This commit is contained in:
Miloslav Číž 2020-02-27 12:07:48 +01:00
parent f09006066d
commit 8a4077bd03
1 changed files with 22 additions and 27 deletions
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49
raycastlib.h
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@ -26,7 +26,7 @@
author: Miloslav "drummyfish" Ciz
license: CC0 1.0
version: 0.902
version: 0.903
*/
#include <stdint.h>
@ -107,9 +107,11 @@
#endif
#ifndef RCL_VERTICAL_FOV
#define RCL_VERTICAL_FOV (RCL_UNITS_PER_SQUARE / 2)
#define RCL_VERTICAL_FOV (RCL_UNITS_PER_SQUARE / 5)
#endif
#define RCL_VERTICAL_FOV_TAN (RCL_VERTICAL_FOV * 4) ///< tan approximation
#ifndef RCL_HORIZONTAL_FOV
#define RCL_HORIZONTAL_FOV (RCL_UNITS_PER_SQUARE / 4)
#endif
@ -890,8 +892,18 @@ void RCL_castRayMultiHit(RCL_Ray ray, RCL_ArrayFunction arrayFunc,
#if !RCL_RECTILINEAR
h.distance = RCL_dist(h.position,ray.start);
#endif
#else
h.distance = (h.distance * 23) / 32;
/* ^ UGLY HACK
For some reason the computed distance with rectilinear is larger, the
correct distance is about 0.711 (~= 23/32) of the computed distance, so
we correct it here in this ugly way.
TODO: investigate why, fix nicely
*/
#endif
if (typeFunc != 0)
h.type = typeFunc(currentSquare.x,currentSquare.y);
@ -1202,20 +1214,6 @@ static inline int16_t _RCL_drawWall(
RCL_Unit textureCoordScaled = pixelInfo->texCoords.y;
#if RCL_RECTILINEAR
RCL_Unit tmp = pixelInfo->depth;
pixelInfo->depth = (pixelInfo->depth * 23) / 32;
/* ^ UGLY HACK
For some reason the computed distance with rectilinear is larger, the
correct distance is about 0.711 (~= 23/32) of the computed distance, so
we correct it here in this ugly way.
TODO: investigate why, fix nicely
*/
#endif
for (RCL_Unit i = yCurrent + increment;
increment == -1 ? i >= limit : i <= limit; // TODO: is efficient?
i += increment)
@ -1232,10 +1230,6 @@ static inline int16_t _RCL_drawWall(
RCL_PIXEL_FUNCTION(pixelInfo);
}
#if RCL_RECTILINEAR
pixelInfo->depth = tmp;
#endif
return limit;
}
@ -1697,10 +1691,11 @@ RCL_PixelInfo RCL_mapToScreen(RCL_Vector2D worldPosition, RCL_Unit height,
result.position.x =
middleColumn + (-1 * toPoint.y * middleColumn) / RCL_nonZero(result.depth);
result.position.y = camera.resolution.y / 2 -
(((3 * camera.resolution.y) / 4 ) *
RCL_perspectiveScale(height - camera.height,result.depth))
/ RCL_UNITS_PER_SQUARE + camera.shear;
result.position.y =
camera.resolution.y / 2 -
(RCL_perspectiveScale(height - camera.height,result.depth)
* camera.resolution.y) / RCL_UNITS_PER_SQUARE
+ camera.shear;
return result;
}
@ -1716,7 +1711,7 @@ RCL_Unit RCL_perspectiveScale(RCL_Unit originalSize, RCL_Unit distance)
return distance != 0 ?
(originalSize * RCL_UNITS_PER_SQUARE) /
((RCL_VERTICAL_FOV * 2 * distance) / RCL_UNITS_PER_SQUARE)
((RCL_VERTICAL_FOV_TAN * 2 * distance) / RCL_UNITS_PER_SQUARE)
: 0;
}
@ -1726,7 +1721,7 @@ RCL_Unit RCL_perspectiveScaleInverse(RCL_Unit originalSize,
return scaledSize != 0 ?
(originalSize * RCL_UNITS_PER_SQUARE + RCL_UNITS_PER_SQUARE / 2) /
// ^ take the middle
((RCL_VERTICAL_FOV * 2 * scaledSize) / RCL_UNITS_PER_SQUARE)
((RCL_VERTICAL_FOV_TAN * 2 * scaledSize) / RCL_UNITS_PER_SQUARE)
: RCL_INFINITY;
}