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sms, add ghosting for GG LCD (generic+libretro only)

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This commit is contained in:
kub 2021-11-04 20:33:28 +01:00
parent 27005bdb5f
commit f55ce7bf47
7 changed files with 135 additions and 18 deletions
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1
platform/common/emu.h
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@ -90,6 +90,7 @@ typedef struct _currentConfig_t {
int renderer;
int renderer32x;
int filter; // EOPT_FILTER_* video filter
int ghosting;
int analog_deadzone;
int msh2_khz;
int ssh2_khz;

1
platform/common/menu_pico.h
View file

@ -89,6 +89,7 @@ typedef enum
MA_32XOPT_SSH2_CYCLES,
MA_SMSOPT_HARDWARE,
MA_SMSOPT_MAPPER,
MA_SMSOPT_GHOSTING,
MA_CTRL_PLAYER1,
MA_CTRL_PLAYER2,
MA_CTRL_EMU,

39
platform/common/upscale.h
View file

@ -36,16 +36,16 @@
#include <pico/pico_types.h>
/* LSB of all colors in a pixel */
/* LSB of all colors in 1 or 2 pixels */
#if defined(USE_BGR555)
#define PXLSB 0x0421
#define PXLSB 0x04210421
#else
#define PXLSB 0x0821
#define PXLSB 0x08210821
#endif
/* RGB565 pixel mixing, see https://www.compuphase.com/graphic/scale3.htm and
http://blargg.8bitalley.com/info/rgb_mixing.html */
/* 2-level mixing */
/* 2-level mixing. NB blargg version isn't 2-pixel-at-once safe for RGB565 */
//#define p_05(d,p1,p2) d=(((p1)+(p2) + ( ((p1)^(p2))&PXLSB))>>1) // round up
//#define p_05(d,p1,p2) d=(((p1)+(p2) - ( ((p1)^(p2))&PXLSB))>>1) // round down
#define p_05(d,p1,p2) d=(((p1)&(p2)) + ((((p1)^(p2))&~PXLSB)>>1))
@ -379,7 +379,7 @@ scalers v:
*/
#define v_mix(di,li,ri,w,p_mix,f) do { \
u16 i, t, u; (void)t, (void)u; \
int i; u32 t, u; (void)t, (void)u; \
for (i = 0; i < w; i += 4) { \
p_mix((di)[i ], f((li)[i ]),f((ri)[i ])); \
p_mix((di)[i+1], f((li)[i+1]),f((ri)[i+1])); \
@ -587,6 +587,35 @@ scalers v:
} while (0)
/* exponentially smoothing (for LCD ghosting): y[n] = x[n]*a + y[n-1]*(1-a) */
#define PXLSBn (PXLSB*15) // using 4 LSBs of each subpixel for subtracting
// NB implement rounding to x[n] by adding 1 to counter round down if y[n] is
// smaller than x[n]: use some of the lower bits to implement subtraction on
// subpixels, with an additional bit to detect borrow, then add the borrow.
// It's doing the increment wrongly in a lot of cases, which doesn't matter
// much since it will converge to x[n] in a few frames anyway if x[n] is static
#define p_05_round(d,p1,p2) \
p_05(u, p1, p2); \
t=(u|~PXLSBn)-(p1&PXLSBn); d = u+(~(t>>4)&PXLSB)
// Unfortunately this won't work for p_025, where adding 1 isn't enough and
// adding 2 would be too much, so offer only p_075 here
#define p_075_round(d,p1,p2) \
p_075(u, p1, p2); \
t=(u|~PXLSBn)-(p1&PXLSBn); d = u+(~(t>>4)&PXLSB)
// this is essentially v_mix and v_copy combined
#define v_blend(di,ri,w,p_mix) do { \
int i; u32 t, u; (void)t, (void)u; \
for (i = 0; i < w; i += 4) { \
p_mix((ri)[i ], (di)[i ],(ri)[i ]); (di)[i ] = (ri)[i ]; \
p_mix((ri)[i+1], (di)[i+1],(ri)[i+1]); (di)[i+1] = (ri)[i+1]; \
p_mix((ri)[i+2], (di)[i+2],(ri)[i+2]); (di)[i+2] = (ri)[i+2]; \
p_mix((ri)[i+3], (di)[i+3],(ri)[i+3]); (di)[i+3] = (ri)[i+3]; \
} \
} while (0)
/* X x Y -> X*5/4 x Y, for X 256->320 */
void upscale_rgb_nn_x_4_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal);
void upscale_rgb_snn_x_4_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal);