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Libretro: add gameboy printer support (save to png / real printer on DevTerm) #2886

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Libretro: add gameboy printer support (save to png / real printer on DevTerm) #2886

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99ba762
Libretro uses COLOR_5_6_5, this fixes incorrect format in PNGWritePixels
msizov Apr 16, 2023
0f468ae
Libretro: connect GB printer and save to PNG when USE_PNG is enabled
msizov Apr 16, 2023
ad44db5
Libretro: USE_DEVTERM connects ClockworkPi's real thermal printer to GB
msizov Apr 16, 2023
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15 changes: 12 additions & 3 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,7 @@ if(NOT LIBMGBA_ONLY)
set(BUILD_QT ON CACHE BOOL "Build Qt frontend")
set(BUILD_SDL ON CACHE BOOL "Build SDL frontend")
set(BUILD_LIBRETRO OFF CACHE BOOL "Build libretro core")
set(USE_DEVTERM OFF CACHE BOOL "Connect Game Boy core to DevTerm thermal printer")
if(APPLE)
set(BUILD_OPENEMU OFF CACHE BOOL "Build OpenEmu core")
endif()
Expand Down Expand Up @@ -987,11 +988,19 @@ if(BUILD_PYTHON)
endif()

if(BUILD_LIBRETRO)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include/mgba-util/image)
file(GLOB RETRO_SRC ${CMAKE_CURRENT_SOURCE_DIR}/src/platform/libretro/*.c)
add_library(${BINARY_NAME}_libretro SHARED ${CORE_SRC} ${RETRO_SRC})
add_library(${BINARY_NAME}_libretro SHARED ${CORE_SRC} ${GB_SIO_SRC} ${UTIL_SRC} ${RETRO_SRC})
add_dependencies(${BINARY_NAME}_libretro ${BINARY_NAME}-version-info)
set_target_properties(${BINARY_NAME}_libretro PROPERTIES PREFIX "" COMPILE_DEFINITIONS "__LIBRETRO__;COLOR_16_BIT;COLOR_5_6_5;DISABLE_THREADING;MGBA_STANDALONE;${OS_DEFINES};${FUNCTION_DEFINES};MINIMAL_CORE=2")
target_link_libraries(${BINARY_NAME}_libretro ${OS_LIB})
set(LIBRETRO_DEFINES "__LIBRETRO__;COLOR_16_BIT;COLOR_5_6_5;DISABLE_THREADING;MGBA_STANDALONE;${OS_DEFINES};${FUNCTION_DEFINES};MINIMAL_CORE=2")
if (USE_PNG)
string(APPEND LIBRETRO_DEFINES ";USE_PNG")
endif()
if (USE_DEVTERM)
string(APPEND LIBRETRO_DEFINES ";USE_DEVTERM")
endif()
set_target_properties(${BINARY_NAME}_libretro PROPERTIES PREFIX "" COMPILE_DEFINITIONS "${LIBRETRO_DEFINES}")
target_link_libraries(${BINARY_NAME}_libretro ${DEPENDENCY_LIBS} ${OS_LIB})
if(MSVC)
install(TARGETS ${BINARY_NAME}_libretro RUNTIME DESTINATION ${LIBRETRO_LIBDIR} COMPONENT ${BINARY_NAME}_libretro)
else()
Expand Down
3 changes: 3 additions & 0 deletions include/mgba/core/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,9 @@ CXX_GUARD_START
#ifdef USE_DEBUGGERS
#include <mgba/debugger/debugger.h>
#endif
#ifdef USE_PNG
#include <mgba-util/image/png-io.h>
#endif

enum mPlatform {
mPLATFORM_NONE = -1,
Expand Down
112 changes: 112 additions & 0 deletions src/platform/libretro/libretro.c
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
#include <mgba/internal/gb/gb.h>
#include <mgba/internal/gb/mbc.h>
#include <mgba/internal/gb/overrides.h>
#include <mgba/internal/gb/sio/printer.h>
#endif
#ifdef M_CORE_GBA
#include <mgba/gba/core.h>
Expand Down Expand Up @@ -108,6 +109,8 @@ static bool audioLowPassEnabled = false;
static int32_t audioLowPassRange = 0;
static int32_t audioLowPassLeftPrev = 0;
static int32_t audioLowPassRightPrev = 0;
static bool printerInitDone;
static struct GBPrinter gbPrinter;

static const int keymap[] = {
RETRO_DEVICE_ID_JOYPAD_A,
Expand Down Expand Up @@ -204,6 +207,112 @@ static void _initSensors(void) {

sensorsInitDone = true;
}
#ifdef USE_PNG
static void _printImage(struct GBPrinter* printer, int height, const uint8_t* data) {
struct mImage* image = mImageCreate(GB_VIDEO_HORIZONTAL_PIXELS, height, mCOLOR_RGB565);

uint32_t colors[4] = {
0xF8F8F8F8,
0xA8A8A8A8,
0x50505050,
0x00000000
};
for (int y = 0; y < height*2; ++y) {
for (int x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS; x += 4) {
uint8_t byte = data[(x + y * GB_VIDEO_HORIZONTAL_PIXELS) / 4];
mImageSetPixel(image, x + 0, y, colors[(byte & 0xC0) >> 6]);
mImageSetPixel(image, x + 1, y, colors[(byte & 0x30) >> 4]);
mImageSetPixel(image, x + 2, y, colors[(byte & 0x0C) >> 2]);
mImageSetPixel(image, x + 3, y, colors[(byte & 0x03) >> 0]);
}
}
uint64_t* creationUsec = malloc(sizeof(*creationUsec));
if (creationUsec) {
#ifndef _MSC_VER
struct timeval tv;
if (!gettimeofday(&tv, 0)) {
uint64_t usec = tv.tv_usec;
usec += tv.tv_sec * 1000000LL;
STORE_64LE(usec, 0, creationUsec);
}
#else
struct timespec ts;
if (timespec_get(&ts, TIME_UTC)) {
uint64_t usec = ts.tv_nsec / 1000;
usec += ts.tv_sec * 1000000LL;
STORE_64LE(usec, 0, creationUsec);
}
#endif
else {
free(creationUsec);
creationUsec = 0;
}
}
const char* saveDir = 0;
environCallback(RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY, &saveDir);
char buf[512];
snprintf(buf, 512, "%sgbprinter-%llu.png", saveDir, *creationUsec);
free(creationUsec);
bool status = mImageSave(image, buf, NULL);
mImageDestroy(image);
GBPrinterDonePrinting(printer);
}
#endif
#ifdef USE_DEVTERM
static void _printDevTerm(struct GBPrinter* printer, int height, const uint8_t* data) {
int fd = open("/tmp/DEVTERM_PRINTER_IN", O_RDWR);

/* upscale 2x */
char header[14] = {
0x1b, 'a', '1', /*align center*/
0x12, '#', 9, /*set print density*/
0x1d, 'v', '0', 'p', 0,0,0,0 /*image header*/};
header[10] = (GB_VIDEO_HORIZONTAL_PIXELS * 2 / 8) % 256;
header[11] = (GB_VIDEO_HORIZONTAL_PIXELS * 2 / 8) / 256;
header[12] = (height * 2) % 256;
header[13] = (height * 2) / 256;
write(fd, header, 14);

char line_buffer [GB_VIDEO_HORIZONTAL_PIXELS / 4];
for (int y = 0; y < height * 2; ++y) {
for (int x = 0; x < GB_VIDEO_HORIZONTAL_PIXELS; x += 4) {
line_buffer[x/4] =
((((data[(x + 0 + y / 2 * GB_VIDEO_HORIZONTAL_PIXELS)/4] & 0xC0) >> 6) > 1) << 7) +
((((data[(x + 0 + y / 2 * GB_VIDEO_HORIZONTAL_PIXELS)/4] & 0xC0) >> 6) > 1) << 6) +
((((data[(x + 1 + y / 2 * GB_VIDEO_HORIZONTAL_PIXELS)/4] & 0x30) >> 4) > 1) << 5) +
((((data[(x + 1 + y / 2 * GB_VIDEO_HORIZONTAL_PIXELS)/4] & 0x30) >> 4) > 1) << 4) +
((((data[(x + 2 + y / 2 * GB_VIDEO_HORIZONTAL_PIXELS)/4] & 0x0C) >> 2) > 1) << 3) +
((((data[(x + 2 + y / 2 * GB_VIDEO_HORIZONTAL_PIXELS)/4] & 0x0C) >> 2) > 1) << 2) +
((((data[(x + 3 + y / 2 * GB_VIDEO_HORIZONTAL_PIXELS)/4] & 0x03) >> 0) > 1) << 1) +
((((data[(x + 3 + y / 2 * GB_VIDEO_HORIZONTAL_PIXELS)/4] & 0x03) >> 0) > 1) << 0) ;
}
write(fd, line_buffer, GB_VIDEO_HORIZONTAL_PIXELS / 4);
}
close(fd);
GBPrinterDonePrinting(printer);
}
#endif
static void _initPrinter(void) {

if (printerInitDone) {
return;
}
#ifdef M_CORE_GB
if (core->platform(core) == mPLATFORM_GB) {
struct GB* gb = core->board;
GBPrinterCreate(&gbPrinter);
#ifdef USE_DEVTERM
gbPrinter.print = _printDevTerm;
#else
#ifdef USE_PNG
gbPrinter.print = _printImage;
#endif
#endif
GBSIOSetDriver(&gb->sio, &(gbPrinter.d));
printerInitDone = true;
}
#endif
}

static void _initRumble(void) {
if (rumbleInitDone) {
Expand Down Expand Up @@ -295,6 +404,9 @@ static void _reloadSettings(void) {
}

_updateGbPal();

printerInitDone = false;
_initPrinter();
#endif

var.key = "mgba_use_bios";
Expand Down
6 changes: 5 additions & 1 deletion src/util/image.c
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Original file line number Diff line number Diff line change
Expand Up @@ -208,6 +208,8 @@ bool mImageSave(const struct mImage* image, const char* path, const char* format

#ifdef USE_PNG
bool mImageSavePNG(const struct mImage* image, struct VFile* vf) {
#ifndef COLOR_16_BIT
#ifndef COLOR_5_6_5
if (image->format != mCOLOR_XBGR8 && image->format != mCOLOR_ABGR8) {
struct mImage* newImage;
if (mColorFormatHasAlpha(image->format)) {
Expand All @@ -219,12 +221,14 @@ bool mImageSavePNG(const struct mImage* image, struct VFile* vf) {
mImageDestroy(newImage);
return ret;
}
#endif
#endif

png_structp png = PNGWriteOpen(vf);
png_infop info = NULL;
bool ok = false;
if (png) {
if (image->format == mCOLOR_XBGR8) {
if (image->format == mCOLOR_XBGR8 || (image->format == mCOLOR_RGB565 || image->format == mCOLOR_BGR565 /*valid only with COLOR_5_6_5*/)) {
info = PNGWriteHeader(png, image->width, image->height);
if (info) {
ok = PNGWritePixels(png, image->width, image->height, image->stride, image->data);
Expand Down