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Optimize helper functions

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Miloslav Číž 2019-10-12 01:49:35 +02:00
parent eda0106d08
commit 10399c778a
1 changed files with 6 additions and 5 deletions
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11
raycastlib.h
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@ -26,7 +26,7 @@
author: Miloslav "drummyfish" Ciz author: Miloslav "drummyfish" Ciz
license: CC0 1.0 license: CC0 1.0
version: 0.88 version: 0.89
*/ */
#include <stdint.h> #include <stdint.h>
@ -154,7 +154,8 @@
#define RCL_min(a,b) ((a) < (b) ? (a) : (b)) #define RCL_min(a,b) ((a) < (b) ? (a) : (b))
#define RCL_max(a,b) ((a) > (b) ? (a) : (b)) #define RCL_max(a,b) ((a) > (b) ? (a) : (b))
#define RCL_nonZero(v) ((v) != 0 ? (v) : 1) ///< To prevent zero divisions. #define RCL_nonZero(v) (v + (v == 0)) ///< To prevent zero divisions.
#define RCL_zeroClamp(x) (x * (x >= 0))
#define RCL_logV2D(v)\ #define RCL_logV2D(v)\
printf("[%d,%d]\n",v.x,v.y); printf("[%d,%d]\n",v.x,v.y);
@ -542,7 +543,7 @@ static inline RCL_Unit RCL_absVal(RCL_Unit value)
{ {
RCL_profileCall(RCL_absVal); RCL_profileCall(RCL_absVal);
return value >= 0 ? value : -1 * value; return value * (((value >= 0) << 1) - 1);
} }
/// Like mod, but behaves differently for negative values. /// Like mod, but behaves differently for negative values.
@ -1092,7 +1093,7 @@ static inline int16_t _RCL_drawHorizontalColumn(
if (doDepth) /*constant condition - compiler should optimize it out*/\ if (doDepth) /*constant condition - compiler should optimize it out*/\
{\ {\
depth += depthIncrement;\ depth += depthIncrement;\
pixelInfo->depth = depth * (depth > 0); /* fast abs val */ \ pixelInfo->depth = RCL_zeroClamp(depth); \
/* ^ int comparison is fast, it is not braching! (= test instr.) */\ /* ^ int comparison is fast, it is not braching! (= test instr.) */\
}\ }\
if (doCoords) /*constant condition - compiler should optimize it out*/\ if (doCoords) /*constant condition - compiler should optimize it out*/\
@ -1180,7 +1181,7 @@ static inline int16_t _RCL_drawWall(
else else
{ {
// with floor wall, don't start under 0 // with floor wall, don't start under 0
pixelInfo->texCoords.y = RCL_max(0,pixelInfo->texCoords.y); pixelInfo->texCoords.y = RCL_zeroClamp(pixelInfo->texCoords.y);
} }
RCL_Unit textureCoordScaled = pixelInfo->texCoords.y; RCL_Unit textureCoordScaled = pixelInfo->texCoords.y;