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https://github.com/ekeeke/Genesis-Plus-GX.git
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158 lines
6.4 KiB
C
158 lines
6.4 KiB
C
/* Sega Master System/Game Gear/TI 99/4A NTSC video filter */
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/* sms_ntsc 0.2.3 */
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#ifndef SMS_NTSC_H
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#define SMS_NTSC_H
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#include "sms_ntsc_config.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Image parameters, ranging from -1.0 to 1.0. Actual internal values shown
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in parenthesis and should remain fairly stable in future versions. */
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typedef struct sms_ntsc_setup_t
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{
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/* Basic parameters */
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double hue; /* -1 = -180 degrees +1 = +180 degrees */
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double saturation; /* -1 = grayscale (0.0) +1 = oversaturated colors (2.0) */
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double contrast; /* -1 = dark (0.5) +1 = light (1.5) */
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double brightness; /* -1 = dark (0.5) +1 = light (1.5) */
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double sharpness; /* edge contrast enhancement/blurring */
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/* Advanced parameters */
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double gamma; /* -1 = dark (1.5) +1 = light (0.5) */
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double resolution; /* image resolution */
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double artifacts; /* artifacts caused by color changes */
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double fringing; /* color artifacts caused by brightness changes */
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double bleed; /* color bleed (color resolution reduction) */
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float const* decoder_matrix; /* optional RGB decoder matrix, 6 elements */
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unsigned char* palette_out; /* optional RGB palette out, 3 bytes per color */
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} sms_ntsc_setup_t;
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/* Video format presets */
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extern sms_ntsc_setup_t const sms_ntsc_composite; /* color bleeding + artifacts */
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extern sms_ntsc_setup_t const sms_ntsc_svideo; /* color bleeding only */
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extern sms_ntsc_setup_t const sms_ntsc_rgb; /* crisp image */
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extern sms_ntsc_setup_t const sms_ntsc_monochrome;/* desaturated + artifacts */
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enum { sms_ntsc_palette_size = 4096 };
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/* Initializes and adjusts parameters. Can be called multiple times on the same
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sms_ntsc_t object. Can pass NULL for either parameter. */
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typedef struct sms_ntsc_t sms_ntsc_t;
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void sms_ntsc_init( sms_ntsc_t* ntsc, sms_ntsc_setup_t const* setup );
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/* Filters one or more rows of pixels. Input pixel format is set by SMS_NTSC_IN_FORMAT
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and output RGB depth is set by SMS_NTSC_OUT_DEPTH. Both default to 16-bit RGB.
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In_row_width is the number of pixels to get to the next input row. Out_pitch
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is the number of *bytes* to get to the next output row. */
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void sms_ntsc_blit( sms_ntsc_t const* ntsc, SMS_NTSC_IN_T const* table, unsigned char* input,
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int in_width, int vline);
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/* Number of output pixels written by blitter for given input width. */
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#define SMS_NTSC_OUT_WIDTH( in_width ) \
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(((in_width) / sms_ntsc_in_chunk + 1) * sms_ntsc_out_chunk)
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/* Number of input pixels that will fit within given output width. Might be
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rounded down slightly; use SMS_NTSC_OUT_WIDTH() on result to find rounded
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value. */
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#define SMS_NTSC_IN_WIDTH( out_width ) \
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(((out_width) / sms_ntsc_out_chunk - 1) * sms_ntsc_in_chunk + 2)
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/* Interface for user-defined custom blitters */
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enum { sms_ntsc_in_chunk = 3 }; /* number of input pixels read per chunk */
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enum { sms_ntsc_out_chunk = 7 }; /* number of output pixels generated per chunk */
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enum { sms_ntsc_black = 0 }; /* palette index for black */
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/* Begins outputting row and starts three pixels. First pixel will be cut off a bit.
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Use sms_ntsc_black for unused pixels. Declares variables, so must be before first
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statement in a block (unless you're using C++). */
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#define SMS_NTSC_BEGIN_ROW( ntsc, pixel0, pixel1, pixel2 ) \
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SMS_NTSC_BEGIN_ROW_6_( pixel0, pixel1, pixel2, SMS_NTSC_IN_FORMAT, ntsc )
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/* Begins input pixel */
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#define SMS_NTSC_COLOR_IN( in_index, ntsc, color_in ) \
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SMS_NTSC_COLOR_IN_( in_index, color_in, SMS_NTSC_IN_FORMAT, ntsc )
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/* Generates output pixel. Bits can be 24, 16, 15, 32 (treated as 24), or 0:
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24: RRRRRRRR GGGGGGGG BBBBBBBB (8-8-8 RGB)
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16: RRRRRGGG GGGBBBBB (5-6-5 RGB)
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15: RRRRRGG GGGBBBBB (5-5-5 RGB)
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0: xxxRRRRR RRRxxGGG GGGGGxxB BBBBBBBx (native internal format; x = junk bits) */
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#define SMS_NTSC_RGB_OUT( index, rgb_out, bits ) \
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SMS_NTSC_RGB_OUT_14_( index, rgb_out, bits, 0 )
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/* private */
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enum { sms_ntsc_entry_size = 3 * 14 };
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typedef unsigned long sms_ntsc_rgb_t;
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struct sms_ntsc_t {
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sms_ntsc_rgb_t table [sms_ntsc_palette_size] [sms_ntsc_entry_size];
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};
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#define SMS_NTSC_BGR12( ntsc, n ) (ntsc)->table [n & 0xFFF]
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#define SMS_NTSC_RGB16( ntsc, n ) \
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(sms_ntsc_rgb_t const*) ((char const*) (ntsc)->table +\
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((n << 10 & 0x7800) | (n & 0x0780) | (n >> 9 & 0x0078)) *\
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(sms_ntsc_entry_size * sizeof (sms_ntsc_rgb_t) / 8))
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#define SMS_NTSC_RGB15( ntsc, n ) \
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(sms_ntsc_rgb_t const*) ((char const*) (ntsc)->table +\
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((n << 9 & 0x3C00) | (n & 0x03C0) | (n >> 9 & 0x003C)) *\
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(sms_ntsc_entry_size * sizeof (sms_ntsc_rgb_t) / 4))
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/* common 3->7 ntsc macros */
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#define SMS_NTSC_BEGIN_ROW_6_( pixel0, pixel1, pixel2, ENTRY, table ) \
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unsigned const sms_ntsc_pixel0_ = (pixel0);\
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sms_ntsc_rgb_t const* kernel0 = ENTRY( table, sms_ntsc_pixel0_ );\
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unsigned const sms_ntsc_pixel1_ = (pixel1);\
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sms_ntsc_rgb_t const* kernel1 = ENTRY( table, sms_ntsc_pixel1_ );\
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unsigned const sms_ntsc_pixel2_ = (pixel2);\
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sms_ntsc_rgb_t const* kernel2 = ENTRY( table, sms_ntsc_pixel2_ );\
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sms_ntsc_rgb_t const* kernelx0;\
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sms_ntsc_rgb_t const* kernelx1 = kernel0;\
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sms_ntsc_rgb_t const* kernelx2 = kernel0
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#define SMS_NTSC_RGB_OUT_14_( x, rgb_out, bits, shift ) {\
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sms_ntsc_rgb_t raw_ =\
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kernel0 [x ] + kernel1 [(x+12)%7+14] + kernel2 [(x+10)%7+28] +\
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kernelx0 [(x+7)%14] + kernelx1 [(x+ 5)%7+21] + kernelx2 [(x+ 3)%7+35];\
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SMS_NTSC_CLAMP_( raw_, shift );\
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SMS_NTSC_RGB_OUT_( rgb_out, bits, shift );\
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}
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/* common ntsc macros */
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#define sms_ntsc_rgb_builder ((1L << 21) | (1 << 11) | (1 << 1))
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#define sms_ntsc_clamp_mask (sms_ntsc_rgb_builder * 3 / 2)
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#define sms_ntsc_clamp_add (sms_ntsc_rgb_builder * 0x101)
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#define SMS_NTSC_CLAMP_( io, shift ) {\
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sms_ntsc_rgb_t sub = (io) >> (9-(shift)) & sms_ntsc_clamp_mask;\
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sms_ntsc_rgb_t clamp = sms_ntsc_clamp_add - sub;\
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io |= clamp;\
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clamp -= sub;\
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io &= clamp;\
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}
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#define SMS_NTSC_COLOR_IN_( index, color, ENTRY, table ) {\
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unsigned color_;\
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kernelx##index = kernel##index;\
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kernel##index = (color_ = (color), ENTRY( table, color_ ));\
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}
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/* x is always zero except in snes_ntsc library */
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#define SMS_NTSC_RGB_OUT_( rgb_out, bits, x ) {\
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rgb_out = (raw_>>(13-x)& 0xF800)|(raw_>>(8-x)&0x07E0)|(raw_>>(4-x)&0x001F);\
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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