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Improve shadow dithering

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This commit is contained in:
Miloslav Číž 2019-10-03 23:37:52 +02:00
parent d3c6a246ed
commit 48ac982460
2 changed files with 41 additions and 12 deletions
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51
main.c
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@ -175,6 +175,38 @@ struct
uint8_t doorRecordCount;
} SFG_currentLevel;
#if SFG_DITHERED_SHADOW
SFG_PROGRAM_MEMORY uint8_t SFG_ditheringPatterns[] =
{
0,0,0,0,
0,0,0,0,
0,0,0,0,
0,1,0,0,
0,0,0,0,
0,1,0,1,
1,0,1,0,
0,1,0,0,
1,0,1,0,
0,1,0,1,
1,0,1,0,
0,1,1,1,
1,1,1,1,
0,1,0,1,
1,1,1,1,
0,1,1,1,
1,1,1,1,
1,1,1,1
};
#endif
void SFG_pixelFunc(RCL_PixelInfo *pixel)
{
uint8_t color;
@ -230,20 +262,17 @@ void SFG_pixelFunc(RCL_PixelInfo *pixel)
if (color != SFG_TRANSPARENT_COLOR)
{
#if SFG_DITHERED_SHADOW
uint8_t fogShadow = (pixel->depth) / RCL_UNITS_PER_SQUARE;
uint8_t fogShadow = (pixel->depth * 4) / (RCL_UNITS_PER_SQUARE);
uint8_t fogShadowPart = fogShadow & 0x03;
uint8_t xMod2 = pixel->position.x & 0x01;
uint8_t fogShadowPart = fogShadow & 0x07;
fogShadow /= 8;
uint8_t xMod4 = pixel->position.x & 0x03;
uint8_t yMod2 = pixel->position.y & 0x01;
fogShadow >>= 2;
if (((fogShadowPart == 1) && xMod2 && yMod2) ||
((fogShadowPart == 2) && (xMod2 == yMod2)) ||
((fogShadowPart == 3) && (xMod2 || yMod2)))
fogShadow += 1;
shadow += fogShadow;
shadow +=
fogShadow + SFG_ditheringPatterns[fogShadowPart * 8 + yMod2 * 4 + xMod4];
#else
shadow += pixel->depth / (RCL_UNITS_PER_SQUARE * 2);
#endif

2
settings.h
View File

@ -22,7 +22,7 @@
/**
Whether shadows (fog) should be dithered, i.e. more smooth (needs a bit more
performance).
CPU performance and memory).
*/
#define SFG_DITHERED_SHADOW 1