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RetroArch/gfx/video_filters/gameboy3x.c
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/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2018 - Daniel De Matteis
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
/* Compile: gcc -o gameboy3x.so -shared gameboy3x.c -std=c99 -O3 -Wall -pedantic -fPIC */
#include "softfilter.h"
#include <stdlib.h>
#include <string.h>
#ifdef RARCH_INTERNAL
#define softfilter_get_implementation gameboy3x_get_implementation
#define softfilter_thread_data gameboy3x_softfilter_thread_data
#define filter_data gameboy3x_filter_data
#endif
/* Default colours match Gambatte's
* Gameboy Pocket palette */
#define GAMEBOY_3X_DEFAULT_PALETTE_0 0x2A3325
#define GAMEBOY_3X_DEFAULT_PALETTE_1 0x535f49
#define GAMEBOY_3X_DEFAULT_PALETTE_2 0x86927C
#define GAMEBOY_3X_DEFAULT_PALETTE_3 0xA7B19A
#define GAMEBOY_3X_DEFAULT_PALETTE_GRID 0xADB8A0
#define GAMEBOY_3X_RGB24_TO_RGB565(rgb24) ( ((rgb24 >> 8) & 0xF800) | ((rgb24 >> 5) & 0x7E0) | ((rgb24 >> 3) & 0x1F) )
typedef struct
{
struct
{
uint32_t pixel_lut[4];
uint32_t grid_lut[4];
} xrgb8888;
struct
{
uint16_t pixel_lut[4];
uint16_t grid_lut[4];
} rgb565;
} gameboy3x_colors_t;
struct softfilter_thread_data
{
void *out_data;
const void *in_data;
size_t out_pitch;
size_t in_pitch;
unsigned colfmt;
unsigned width;
unsigned height;
int first;
int last;
};
struct filter_data
{
unsigned threads;
struct softfilter_thread_data *workers;
unsigned in_fmt;
gameboy3x_colors_t colors;
};
static unsigned gameboy3x_generic_input_fmts(void)
{
return SOFTFILTER_FMT_RGB565 | SOFTFILTER_FMT_XRGB8888;
}
static unsigned gameboy3x_generic_output_fmts(unsigned input_fmts)
{
return input_fmts;
}
static unsigned gameboy3x_generic_threads(void *data)
{
struct filter_data *filt = (struct filter_data*)data;
return filt->threads;
}
static uint32_t gameboy3x_get_grid_colour(unsigned palette, unsigned grid)
{
/* > Grid colour is a 3:2 mix of palette:grid
* > We only have four pixel colours, so can
* pre-calculate everything in advance */
uint32_t palette_r = (palette & 0xFF0000) >> 16;
uint32_t palette_g = (palette & 0xFF00) >> 8;
uint32_t palette_b = (palette & 0xFF);
uint32_t grid_r = (grid & 0xFF0000) >> 16;
uint32_t grid_g = (grid & 0xFF00) >> 8;
uint32_t grid_b = (grid & 0xFF);
uint32_t mix_r = ((3 * palette_r) + (2 * grid_r)) / 5;
uint32_t mix_g = ((3 * palette_g) + (2 * grid_g)) / 5;
uint32_t mix_b = ((3 * palette_b) + (2 * grid_b)) / 5;
return (mix_r << 16) | (mix_g << 8) | mix_b;
}
static void gameboy3x_initialize(struct filter_data *filt,
const struct softfilter_config *config,
void *userdata)
{
unsigned palette[4];
unsigned palette_grid;
size_t i;
/* Read raw colour values */
config->get_hex(userdata, "palette_0", &palette[0],
GAMEBOY_3X_DEFAULT_PALETTE_0);
config->get_hex(userdata, "palette_1", &palette[1],
GAMEBOY_3X_DEFAULT_PALETTE_1);
config->get_hex(userdata, "palette_2", &palette[2],
GAMEBOY_3X_DEFAULT_PALETTE_2);
config->get_hex(userdata, "palette_3", &palette[3],
GAMEBOY_3X_DEFAULT_PALETTE_3);
config->get_hex(userdata, "palette_grid", &palette_grid,
GAMEBOY_3X_DEFAULT_PALETTE_GRID);
/* Loop over palette colours */
for (i = 0; i < 4; i++)
{
uint32_t grid_color;
/* Populate pixel lookup tables */
filt->colors.rgb565.pixel_lut[i] = GAMEBOY_3X_RGB24_TO_RGB565(palette[i]);
filt->colors.xrgb8888.pixel_lut[i] = palette[i];
/* Populate grid lookup tables */
grid_color = gameboy3x_get_grid_colour(palette[i], palette_grid);
filt->colors.rgb565.grid_lut[i] = GAMEBOY_3X_RGB24_TO_RGB565(grid_color);
filt->colors.xrgb8888.grid_lut[i] = grid_color;
}
}
static void *gameboy3x_generic_create(const struct softfilter_config *config,
unsigned in_fmt, unsigned out_fmt,
unsigned max_width, unsigned max_height,
unsigned threads, softfilter_simd_mask_t simd, void *userdata)
{
struct filter_data *filt = (struct filter_data*)calloc(1, sizeof(*filt));
if (!filt)
return NULL;
if (!(filt->workers = (struct softfilter_thread_data*)calloc(1, sizeof(struct softfilter_thread_data))))
{
free(filt);
return NULL;
}
/* Apparently the code is not thread-safe,
* so force single threaded operation... */
filt->threads = 1;
filt->in_fmt = in_fmt;
/* Initialise colour lookup tables */
gameboy3x_initialize(filt, config, userdata);
return filt;
}
static void gameboy3x_generic_output(void *data,
unsigned *out_width, unsigned *out_height,
unsigned width, unsigned height)
{
*out_width = width * 3;
*out_height = height * 3;
}
static void gameboy3x_generic_destroy(void *data)
{
struct filter_data *filt = (struct filter_data*)data;
if (!filt)
return;
free(filt->workers);
free(filt);
}
static void gameboy3x_work_cb_rgb565(void *data, void *thread_data)
{
struct filter_data *filt = (struct filter_data*)data;
struct softfilter_thread_data *thr = (struct softfilter_thread_data*)thread_data;
const uint16_t *input = (const uint16_t*)thr->in_data;
uint16_t *output = (uint16_t*)thr->out_data;
uint16_t in_stride = (uint16_t)(thr->in_pitch >> 1);
uint16_t out_stride = (uint16_t)(thr->out_pitch >> 1);
uint16_t *pixel_lut = filt->colors.rgb565.pixel_lut;
uint16_t *grid_lut = filt->colors.rgb565.grid_lut;
uint16_t x, y;
for (y = 0; y < thr->height; ++y)
{
uint16_t *out_ptr = output;
for (x = 0; x < thr->width; ++x)
{
uint16_t *out_line_ptr = out_ptr;
uint16_t in_color = *(input + x);
uint16_t in_rgb_mean =
(in_color >> 11 & 0x1F) +
(in_color >> 6 & 0x1F) +
(in_color & 0x1F);
uint16_t out_pixel_color;
uint16_t out_grid_color;
uint16_t lut_index;
/* Calculate mean value of the 3 RGB
* colour components */
in_rgb_mean += (in_rgb_mean + 2) >> 2;
in_rgb_mean += (in_rgb_mean + 8) >> 4;
in_rgb_mean += (in_rgb_mean + 128) >> 8;
in_rgb_mean >>= 2;
/* Convert to lookup table index
* > This can never be greater than 3,
* but check anyway... */
lut_index = in_rgb_mean >> 3;
lut_index = (lut_index > 3) ? 3 : lut_index;
/* Get output pixel and grid colours */
out_pixel_color = *(pixel_lut + lut_index);
out_grid_color = *(grid_lut + lut_index);
/* - Pixel layout (p = pixel, g = grid) -
* Before: After:
* (p) (g)(p)(p)
* (g)(p)(p)
* (g)(g)(g)
*/
/* Row 1: (g)(p)(p) */
*out_line_ptr = out_grid_color;
*(out_line_ptr + 1) = out_pixel_color;
*(out_line_ptr + 2) = out_pixel_color;
out_line_ptr += out_stride;
/* Row 2: (g)(p)(p) */
*out_line_ptr = out_grid_color;
*(out_line_ptr + 1) = out_pixel_color;
*(out_line_ptr + 2) = out_pixel_color;
out_line_ptr += out_stride;
/* Row 3: (g)(g)(g) */
*out_line_ptr = out_grid_color;
*(out_line_ptr + 1) = out_grid_color;
*(out_line_ptr + 2) = out_grid_color;
out_ptr += 3;
}
input += in_stride;
output += out_stride * 3;
}
}
static void gameboy3x_work_cb_xrgb8888(void *data, void *thread_data)
{
struct filter_data *filt = (struct filter_data*)data;
struct softfilter_thread_data *thr = (struct softfilter_thread_data*)thread_data;
const uint32_t *input = (const uint32_t*)thr->in_data;
uint32_t *output = (uint32_t*)thr->out_data;
uint32_t in_stride = (uint32_t)(thr->in_pitch >> 2);
uint32_t out_stride = (uint32_t)(thr->out_pitch >> 2);
uint32_t *pixel_lut = filt->colors.xrgb8888.pixel_lut;
uint32_t *grid_lut = filt->colors.xrgb8888.grid_lut;
uint32_t x, y;
for (y = 0; y < thr->height; ++y)
{
uint32_t *out_ptr = output;
for (x = 0; x < thr->width; ++x)
{
uint32_t *out_line_ptr = out_ptr;
uint32_t in_color = *(input + x);
uint32_t in_rgb_mean =
(in_color >> 16 & 0xFF) +
(in_color >> 8 & 0xFF) +
(in_color & 0xFF);
uint32_t out_pixel_color;
uint32_t out_grid_color;
uint32_t lut_index;
/* Calculate mean value of the 3 RGB
* colour components */
in_rgb_mean += (in_rgb_mean + 2) >> 2;
in_rgb_mean += (in_rgb_mean + 8) >> 4;
in_rgb_mean += (in_rgb_mean + 128) >> 8;
in_rgb_mean >>= 2;
/* Convert to lookup table index
* > This can never be greater than 3,
* but check anyway... */
lut_index = in_rgb_mean >> 6;
lut_index = (lut_index > 3) ? 3 : lut_index;
/* Get output pixel and grid colours */
out_pixel_color = *(pixel_lut + lut_index);
out_grid_color = *(grid_lut + lut_index);
/* - Pixel layout (p = pixel, g = grid) -
* Before: After:
* (p) (g)(p)(p)
* (g)(p)(p)
* (g)(g)(g)
*/
/* Row 1: (g)(p)(p) */
*out_line_ptr = out_grid_color;
*(out_line_ptr + 1) = out_pixel_color;
*(out_line_ptr + 2) = out_pixel_color;
out_line_ptr += out_stride;
/* Row 2: (g)(p)(p) */
*out_line_ptr = out_grid_color;
*(out_line_ptr + 1) = out_pixel_color;
*(out_line_ptr + 2) = out_pixel_color;
out_line_ptr += out_stride;
/* Row 3: (g)(g)(g) */
*out_line_ptr = out_grid_color;
*(out_line_ptr + 1) = out_grid_color;
*(out_line_ptr + 2) = out_grid_color;
out_ptr += 3;
}
input += in_stride;
output += out_stride * 3;
}
}
static void gameboy3x_generic_packets(void *data,
struct softfilter_work_packet *packets,
void *output, size_t output_stride,
const void *input, unsigned width, unsigned height, size_t input_stride)
{
/* We are guaranteed single threaded operation
* (filt->threads = 1) so we don't need to loop
* over threads and can cull some code */
struct filter_data *filt = (struct filter_data*)data;
struct softfilter_thread_data *thr = (struct softfilter_thread_data*)&filt->workers[0];
thr->out_data = (uint8_t*)output;
thr->in_data = (const uint8_t*)input;
thr->out_pitch = output_stride;
thr->in_pitch = input_stride;
thr->width = width;
thr->height = height;
if (filt->in_fmt == SOFTFILTER_FMT_RGB565)
packets[0].work = gameboy3x_work_cb_rgb565;
else if (filt->in_fmt == SOFTFILTER_FMT_XRGB8888)
packets[0].work = gameboy3x_work_cb_xrgb8888;
packets[0].thread_data = thr;
}
static const struct softfilter_implementation gameboy3x_generic = {
gameboy3x_generic_input_fmts,
gameboy3x_generic_output_fmts,
gameboy3x_generic_create,
gameboy3x_generic_destroy,
gameboy3x_generic_threads,
gameboy3x_generic_output,
gameboy3x_generic_packets,
SOFTFILTER_API_VERSION,
"Gameboy3x",
"gameboy3x",
};
const struct softfilter_implementation *softfilter_get_implementation(
softfilter_simd_mask_t simd)
{
return &gameboy3x_generic;
}
#ifdef RARCH_INTERNAL
#undef softfilter_get_implementation
#undef softfilter_thread_data
#undef filter_data
#endif
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