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Add LUT option
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1 changed files with 42 additions and 4 deletions
46
raycastlib.h
46
raycastlib.h
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@ -11,11 +11,12 @@
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version: 0.1
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- Game field's bottom left corner is at [0,0].
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- X axis goes right.
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- Y axis goes up.
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- Each game square is UNITS_PER_SQUARE * UNITS_PER_SQUARE.
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- X axis goes right in the ground plane.
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- Y axis goes up in the ground plane.
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- Height means the Z (vertical) coordinate.
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- Each game square is UNITS_PER_SQUARE * UNITS_PER_SQUARE points.
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- Angles are in Units, 0 means pointing right (x+) and positively rotates
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clockwise, a full angle has UNITS_PER_SQUARE Units.
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clockwise. A full angle has UNITS_PER_SQUARE Units.
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*/
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#include <stdint.h>
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@ -37,6 +38,14 @@
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typedef uint16_t uint_maybe32_t;
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#endif
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#ifndef USE_COS_LUT
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#define USE_COS_LUT 0 /**< type of look up table for cos function:
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0: none (compute)
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1: 64 items
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2: 128 items
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*/
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#endif
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#ifndef VERTICAL_FOV
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#define VERTICAL_FOV (UNITS_PER_SQUARE / 2)
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#endif
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@ -366,6 +375,29 @@ Unit divRoundDown(Unit value, Unit divisor)
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(UNITS_PER_SQUARE / 2 * UNITS_PER_SQUARE / 2 - 4 * (x) * (x)) /\
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(UNITS_PER_SQUARE / 2 * UNITS_PER_SQUARE / 2 + (x) * (x)))
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#if USE_COS_LUT == 1
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const Unit cosLUT[64] =
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{
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1024,1019,1004,979,946,903,851,791,724,649,568,482,391,297,199,100,0,-100,
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-199,-297,-391,-482,-568,-649,-724,-791,-851,-903,-946,-979,-1004,-1019,
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-1023,-1019,-1004,-979,-946,-903,-851,-791,-724,-649,-568,-482,-391,-297,
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-199,-100,0,100,199,297,391,482,568,649,724,791,851,903,946,979,1004,1019
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};
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#elif USE_COS_LUT == 2
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const Unit cosLUT[128] =
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{
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1024,1022,1019,1012,1004,993,979,964,946,925,903,878,851,822,791,758,724,
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687,649,609,568,526,482,437,391,344,297,248,199,150,100,50,0,-50,-100,-150,
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-199,-248,-297,-344,-391,-437,-482,-526,-568,-609,-649,-687,-724,-758,-791,
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-822,-851,-878,-903,-925,-946,-964,-979,-993,-1004,-1012,-1019,-1022,-1023,
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-1022,-1019,-1012,-1004,-993,-979,-964,-946,-925,-903,-878,-851,-822,-791,
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-758,-724,-687,-649,-609,-568,-526,-482,-437,-391,-344,-297,-248,-199,-150,
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-100,-50,0,50,100,150,199,248,297,344,391,437,482,526,568,609,649,687,724,
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758,791,822,851,878,903,925,946,964,979,993,1004,1012,1019,1022
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};
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#endif
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Unit cosInt(Unit input)
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{
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profileCall(cosInt);
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@ -374,6 +406,11 @@ Unit cosInt(Unit input)
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input = wrap(input,UNITS_PER_SQUARE);
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#if USE_COS_LUT == 1
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return cosLUT[input / 16];
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#elif USE_COS_LUT == 2
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return cosLUT[input / 8];
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#else
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if (input < UNITS_PER_SQUARE / 4)
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return trigHelper(input);
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else if (input < UNITS_PER_SQUARE / 2)
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@ -382,6 +419,7 @@ Unit cosInt(Unit input)
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return -1 * trigHelper(input - UNITS_PER_SQUARE / 2);
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else
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return trigHelper(UNITS_PER_SQUARE - input);
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#endif
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}
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#undef trigHelper
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