207 lines
8.9 KiB
C
207 lines
8.9 KiB
C
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/* SNES NTSC video filter */
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/* snes_ntsc 0.2.2 */
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#ifndef SNES_NTSC_H
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#define SNES_NTSC_H
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#include "snes_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 snes_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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int merge_fields; /* if 1, merges even and odd fields together to reduce flicker */
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float const* decoder_matrix; /* optional RGB decoder matrix, 6 elements */
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unsigned long const* bsnes_colortbl; /* undocumented; set to 0 */
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} snes_ntsc_setup_t;
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/* Video format presets */
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extern snes_ntsc_setup_t const snes_ntsc_composite; /* color bleeding + artifacts */
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extern snes_ntsc_setup_t const snes_ntsc_svideo; /* color bleeding only */
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extern snes_ntsc_setup_t const snes_ntsc_rgb; /* crisp image */
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extern snes_ntsc_setup_t const snes_ntsc_monochrome;/* desaturated + artifacts */
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/* Initializes and adjusts parameters. Can be called multiple times on the same
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snes_ntsc_t object. Can pass NULL for either parameter. */
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typedef struct snes_ntsc_t snes_ntsc_t;
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void snes_ntsc_init( snes_ntsc_t* ntsc, snes_ntsc_setup_t const* setup );
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/* Filters one or more rows of pixels. Input pixel format is set by SNES_NTSC_IN_FORMAT
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and output RGB depth is set by SNES_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 snes_ntsc_blit( snes_ntsc_t const* ntsc, SNES_NTSC_IN_T const* input,
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long in_row_width, int burst_phase, int in_width, int in_height,
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void* rgb_out, long out_pitch );
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void snes_ntsc_blit_hires( snes_ntsc_t const* ntsc, SNES_NTSC_IN_T const* input,
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long in_row_width, int burst_phase, int in_width, int in_height,
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void* rgb_out, long out_pitch );
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/* Number of output pixels written by low-res blitter for given input width. Width
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might be rounded down slightly; use SNES_NTSC_IN_WIDTH() on result to find rounded
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value. Guaranteed not to round 256 down at all. */
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#define SNES_NTSC_OUT_WIDTH( in_width ) \
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((((in_width) - 1) / snes_ntsc_in_chunk + 1) * snes_ntsc_out_chunk)
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/* Number of low-res input pixels that will fit within given output width. Might be
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rounded down slightly; use SNES_NTSC_OUT_WIDTH() on result to find rounded
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value. */
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#define SNES_NTSC_IN_WIDTH( out_width ) \
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(((out_width) / snes_ntsc_out_chunk - 1) * snes_ntsc_in_chunk + 1)
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/* Interface for user-defined custom blitters */
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enum { snes_ntsc_in_chunk = 3 }; /* number of input pixels read per chunk */
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enum { snes_ntsc_out_chunk = 7 }; /* number of output pixels generated per chunk */
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enum { snes_ntsc_black = 0 }; /* palette index for black */
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enum { snes_ntsc_burst_count = 3 }; /* burst phase cycles through 0, 1, and 2 */
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/* Begins outputting row and starts three pixels. First pixel will be cut off a bit.
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Use snes_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 SNES_NTSC_BEGIN_ROW( ntsc, burst, pixel0, pixel1, pixel2 ) \
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char const* ktable = \
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(char const*) (ntsc)->table + burst * (snes_ntsc_burst_size * sizeof (snes_ntsc_rgb_t));\
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SNES_NTSC_BEGIN_ROW_6_( pixel0, pixel1, pixel2, SNES_NTSC_IN_FORMAT, ktable )
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/* Begins input pixel */
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#define SNES_NTSC_COLOR_IN( index, color ) \
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SNES_NTSC_COLOR_IN_( index, color, SNES_NTSC_IN_FORMAT, ktable )
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/* Generates output pixel. Bits can be 24, 16, 15, 14, 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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14: BBBBBGG GGGRRRRR (5-5-5 BGR, native SNES format)
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0: xxxRRRRR RRRxxGGG GGGGGxxB BBBBBBBx (native internal format; x = junk bits) */
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#define SNES_NTSC_RGB_OUT( index, rgb_out, bits ) \
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SNES_NTSC_RGB_OUT_14_( index, rgb_out, bits, 1 )
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/* Hires equivalents */
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#define SNES_NTSC_HIRES_ROW( ntsc, burst, pixel1, pixel2, pixel3, pixel4, pixel5 ) \
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char const* ktable = \
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(char const*) (ntsc)->table + burst * (snes_ntsc_burst_size * sizeof (snes_ntsc_rgb_t));\
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unsigned const snes_ntsc_pixel1_ = (pixel1);\
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snes_ntsc_rgb_t const* kernel1 = SNES_NTSC_IN_FORMAT( ktable, snes_ntsc_pixel1_ );\
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unsigned const snes_ntsc_pixel2_ = (pixel2);\
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snes_ntsc_rgb_t const* kernel2 = SNES_NTSC_IN_FORMAT( ktable, snes_ntsc_pixel2_ );\
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unsigned const snes_ntsc_pixel3_ = (pixel3);\
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snes_ntsc_rgb_t const* kernel3 = SNES_NTSC_IN_FORMAT( ktable, snes_ntsc_pixel3_ );\
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unsigned const snes_ntsc_pixel4_ = (pixel4);\
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snes_ntsc_rgb_t const* kernel4 = SNES_NTSC_IN_FORMAT( ktable, snes_ntsc_pixel4_ );\
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unsigned const snes_ntsc_pixel5_ = (pixel5);\
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snes_ntsc_rgb_t const* kernel5 = SNES_NTSC_IN_FORMAT( ktable, snes_ntsc_pixel5_ );\
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snes_ntsc_rgb_t const* kernel0 = kernel1;\
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snes_ntsc_rgb_t const* kernelx0;\
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snes_ntsc_rgb_t const* kernelx1 = kernel1;\
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snes_ntsc_rgb_t const* kernelx2 = kernel1;\
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snes_ntsc_rgb_t const* kernelx3 = kernel1;\
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snes_ntsc_rgb_t const* kernelx4 = kernel1;\
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snes_ntsc_rgb_t const* kernelx5 = kernel1
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#define SNES_NTSC_HIRES_OUT( x, rgb_out, bits ) {\
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snes_ntsc_rgb_t raw_ =\
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kernel0 [ x ] + kernel2 [(x+5)%7+14] + kernel4 [(x+3)%7+28] +\
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kernelx0 [(x+7)%7+7] + kernelx2 [(x+5)%7+21] + kernelx4 [(x+3)%7+35] +\
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kernel1 [(x+6)%7 ] + kernel3 [(x+4)%7+14] + kernel5 [(x+2)%7+28] +\
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kernelx1 [(x+6)%7+7] + kernelx3 [(x+4)%7+21] + kernelx5 [(x+2)%7+35];\
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SNES_NTSC_CLAMP_( raw_, 0 );\
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SNES_NTSC_RGB_OUT_( rgb_out, (bits), 0 );\
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}
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/* private */
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enum { snes_ntsc_entry_size = 128 };
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enum { snes_ntsc_palette_size = 0x2000 };
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typedef unsigned long snes_ntsc_rgb_t;
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struct snes_ntsc_t {
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snes_ntsc_rgb_t table [snes_ntsc_palette_size] [snes_ntsc_entry_size];
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};
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enum { snes_ntsc_burst_size = snes_ntsc_entry_size / snes_ntsc_burst_count };
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#define SNES_NTSC_RGB16( ktable, n ) \
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(snes_ntsc_rgb_t const*) (ktable + ((n & 0x001E) | (n >> 1 & 0x03E0) | (n >> 2 & 0x3C00)) * \
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(snes_ntsc_entry_size / 2 * sizeof (snes_ntsc_rgb_t)))
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#define SNES_NTSC_BGR15( ktable, n ) \
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(snes_ntsc_rgb_t const*) (ktable + ((n << 9 & 0x3C00) | (n & 0x03E0) | (n >> 10 & 0x001E)) * \
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(snes_ntsc_entry_size / 2 * sizeof (snes_ntsc_rgb_t)))
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/* common 3->7 ntsc macros */
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#define SNES_NTSC_BEGIN_ROW_6_( pixel0, pixel1, pixel2, ENTRY, table ) \
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unsigned const snes_ntsc_pixel0_ = (pixel0);\
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snes_ntsc_rgb_t const* kernel0 = ENTRY( table, snes_ntsc_pixel0_ );\
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unsigned const snes_ntsc_pixel1_ = (pixel1);\
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snes_ntsc_rgb_t const* kernel1 = ENTRY( table, snes_ntsc_pixel1_ );\
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unsigned const snes_ntsc_pixel2_ = (pixel2);\
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snes_ntsc_rgb_t const* kernel2 = ENTRY( table, snes_ntsc_pixel2_ );\
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snes_ntsc_rgb_t const* kernelx0;\
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snes_ntsc_rgb_t const* kernelx1 = kernel0;\
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snes_ntsc_rgb_t const* kernelx2 = kernel0
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#define SNES_NTSC_RGB_OUT_14_( x, rgb_out, bits, shift ) {\
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snes_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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SNES_NTSC_CLAMP_( raw_, shift );\
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SNES_NTSC_RGB_OUT_( rgb_out, bits, shift );\
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}
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/* common ntsc macros */
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#define snes_ntsc_rgb_builder ((1L << 21) | (1 << 11) | (1 << 1))
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#define snes_ntsc_clamp_mask (snes_ntsc_rgb_builder * 3 / 2)
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#define snes_ntsc_clamp_add (snes_ntsc_rgb_builder * 0x101)
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#define SNES_NTSC_CLAMP_( io, shift ) {\
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snes_ntsc_rgb_t sub = (io) >> (9-(shift)) & snes_ntsc_clamp_mask;\
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snes_ntsc_rgb_t clamp = snes_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 SNES_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 SNES_NTSC_RGB_OUT_( rgb_out, bits, x ) {\
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if ( bits == 16 )\
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rgb_out = (raw_>>(13-x)& 0xF800)|(raw_>>(8-x)&0x07E0)|(raw_>>(4-x)&0x001F);\
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if ( bits == 24 || bits == 32 )\
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rgb_out = (raw_>>(5-x)&0xFF0000)|(raw_>>(3-x)&0xFF00)|(raw_>>(1-x)&0xFF);\
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if ( bits == 15 )\
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rgb_out = (raw_>>(14-x)& 0x7C00)|(raw_>>(9-x)&0x03E0)|(raw_>>(4-x)&0x001F);\
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if ( bits == 14 )\
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rgb_out = (raw_>>(24-x)& 0x001F)|(raw_>>(9-x)&0x03E0)|(raw_<<(6+x)&0x7C00);\
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if ( bits == 0 )\
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rgb_out = raw_ << x;\
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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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