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cgbwebcam
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initial grey version

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lif 2024-03-02 22:43:07 -08:00
commit fa030c4bc4
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4
.gitignore vendored Normal file
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_build
.cache
compile_commands.json
gbcamera.gb

6
.gitmodules vendored Normal file
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[submodule "SDL"]
path = SDL
url = https://github.com/libsdl-org/SDL/
[submodule "mgba"]
path = mgba
url = https://github.com/mgba-emu/mgba/

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CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 3.5)
project(cgbwebcam)
set(SDL_STATIC ON)
set(SDL_SHARED OFF)
set(SDL_AUDIO OFF)
set(SDL_CAMERA ON)
set(SDL_VIDEO ON)
add_subdirectory(SDL)
set(BUILD_GL OFF)
set(BUILD_GLES2 OFF)
set(BUILD_GLES3 OFF)
set(BUILD_LIBRETRO OFF)
set(BUILD_PYTHON OFF)
set(BUILD_QT OFF)
set(BUILD_SDL OFF)
set(BUILD_SHARED OFF)
set(BUILD_STATIC ON)
set(DISABLE_DEPS ON)
set(ENABLE_SCRIPTING OFF)
set(M_CORE_GB ON)
set(M_CORE_GBA OFF)
set(USE_DEBUGGERS OFF)
set(USE_DISCORD_RPC OFF)
set(USE_FFMPEG OFF)
set(USE_LUA OFF)
add_subdirectory(mgba)
include_directories(SDL/include)
include_directories(mgba/include)
add_executable(cgbwebcam main.c)
target_link_libraries(cgbwebcam SDL3-static mgba)

1
SDL Submodule

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Subproject commit 7ff9be739827a53763b393897a371674d45b053d

369
main.c Normal file
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#include "SDL_error.h"
#include "SDL_stdinc.h"
#include "SDL_surface.h"
#include "mgba/core/config.h"
#include <stdint.h>
#define SDL_MAIN_USE_CALLBACKS 1
#include "SDL3/SDL_init.h"
#include "SDL3/SDL_log.h"
#include "SDL3/SDL_main.h"
#include "SDL3/SDL_pixels.h"
#include "SDL3/SDL_render.h"
#include "SDL3/SDL_timer.h"
#include "SDL3/SDL_video.h"
#include "mgba/core/core.h"
#include "mgba/core/interface.h"
#include "mgba/feature/commandline.h"
#include "mgba-util/image.h"
static SDL_Window* window = NULL;
static SDL_Renderer* renderer = NULL;
static SDL_Camera* camera = NULL;
static SDL_CameraSpec spec;
static SDL_Texture* texture = NULL;
static SDL_bool texture_updated = SDL_FALSE;
static SDL_Surface* frame_current = NULL;
static SDL_CameraDeviceID front_camera = 0;
static SDL_CameraDeviceID back_camera = 0;
static SDL_Surface* scaled = NULL;
static SDL_Surface* screen = NULL;
static struct mCore* core = NULL;
enum mColorFormat pixfmt_sdl_to_mgba(uint32_t sdl_fmt) {
switch (sdl_fmt) {
case SDL_PIXELFORMAT_ABGR1555: return mCOLOR_BGR5;
case SDL_PIXELFORMAT_ABGR8888: return mCOLOR_ABGR8;
case SDL_PIXELFORMAT_ARGB1555: return mCOLOR_RGB5;
case SDL_PIXELFORMAT_ARGB8888: return mCOLOR_ARGB8;
case SDL_PIXELFORMAT_BGR565: return mCOLOR_BGR565;
case SDL_PIXELFORMAT_BGRA8888: return mCOLOR_BGRA8;
case SDL_PIXELFORMAT_BGRX8888: return mCOLOR_BGRX8;
case SDL_PIXELFORMAT_RGB565: return mCOLOR_RGB565;
case SDL_PIXELFORMAT_RGBA8888: return mCOLOR_RGBA8;
case SDL_PIXELFORMAT_RGBX8888: return mCOLOR_RGBX8;
case SDL_PIXELFORMAT_XBGR1555: return mCOLOR_BGR5;
case SDL_PIXELFORMAT_XBGR8888: return mCOLOR_XBGR8;
case SDL_PIXELFORMAT_XRGB1555: return mCOLOR_RGB5;
case SDL_PIXELFORMAT_XRGB8888: return mCOLOR_XRGB8;
// does this even make sense?
case SDL_PIXELFORMAT_INDEX8: return mCOLOR_PAL8;
// others don't quite match between mgba and SDL
default: return mCOLOR_ANY;
}
}
void myStartRequestImage(struct mImageSource* self, unsigned w, unsigned h, int colorFormats) {
SDL_DestroySurface(scaled);
scaled = SDL_CreateSurface(w, h, SDL_PIXELFORMAT_XBGR1555);
SDL_Log("scaled: %d x %d", w, h);
// SDL_DestroyTexture(texture);
// texture = SDL_CreateTextureFromSurface(renderer, scaled);
}
void myStopRequestImage(struct mImageSource* self) {
SDL_DestroySurface(scaled);
scaled = NULL;
}
void myRequestImage(struct mImageSource* self, const void** buf, size_t* stride, enum mColorFormat* fmt) {
if (scaled != NULL && frame_current != NULL) {
struct SDL_Rect srcrect = frame_current->clip_rect;
int w = srcrect.h * scaled->clip_rect.w / scaled->clip_rect.h;
if (w >= srcrect.w) {
srcrect.x = (srcrect.w - w) / 2;
srcrect.w = w;
} else {
int h = srcrect.w * scaled->clip_rect.h / scaled->clip_rect.w;
srcrect.y = (srcrect.h - h) / 2;
srcrect.h = h;
}
int res = SDL_BlitSurfaceScaled(frame_current, &srcrect, scaled, &scaled->clip_rect, SDL_SCALEMODE_NEAREST);
if (res != 0) {
SDL_Log("failed to scale: %s", SDL_GetError());
}
*fmt = pixfmt_sdl_to_mgba(scaled->format->format);
*stride = scaled->pitch / (BYTES_PER_PIXEL / scaled->format->bytes_per_pixel);
*buf = scaled->pixels;
}
}
const struct mImageSource gb_img_src = {
.requestImage = myRequestImage,
.startRequestImage = myStartRequestImage,
.stopRequestImage = myStopRequestImage,
};
int SDL_AppInit(int argc, char *argv[]) {
int devcount = 0;
int i;
struct mArguments args = {};
bool parsed = mArgumentsParse(&args, argc, argv, NULL, 0);
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
if (!parsed) {
SDL_Log("Couldn't parse arguments");
return -1;
}
core = mCoreFind(args.fname);
if (!core || !core->init(core)) {
SDL_Log("Couldn't initialize mgba core!");
return -1;
}
if (!mCoreLoadFile(core, args.fname)) {
SDL_Log("Failed to load ROM");
return -1;
}
mCoreConfigInit(&core->config, NULL);
//mCoreConfigLoad(&core->config);
mArgumentsApply(&args, NULL, 0, &core->config);
mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "detect");
mCoreConfigSetDefaultValue(&core->config, "sgb.borders", "0");
mCoreLoadConfig(core);
unsigned w, h;
core->currentVideoSize(core, &w, &h);
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_CAMERA) != 0) {
SDL_Log("Couldn't initialize SDL3: %s", SDL_GetError());
return -1;
}
window = SDL_CreateWindow("cgbwebcam", w, h, 0);
if (!window) {
SDL_Log("Couldn't create window: %s", SDL_GetError());
return -1;
}
renderer = SDL_CreateRenderer(window, NULL, 0);
if (!renderer) {
SDL_Log("Couldn't create renderer: %s", SDL_GetError());
return -1;
}
SDL_LogSetAllPriority(SDL_LOG_PRIORITY_VERBOSE);
SDL_CameraDeviceID *devices = SDL_GetCameraDevices(&devcount);
if (!devices) {
SDL_Log("SDL_GetCameraDevices failed: %s", SDL_GetError());
return -1;
}
SDL_Log("Saw %d camera devices.", devcount);
for (i = 0; i < devcount; i++) {
const SDL_CameraDeviceID device = devices[i];
char *name = SDL_GetCameraDeviceName(device);
const SDL_CameraPosition position = SDL_GetCameraDevicePosition(device);
const char *posstr = "";
if (position == SDL_CAMERA_POSITION_FRONT_FACING) {
front_camera = device;
posstr = "[front-facing] ";
} else if (position == SDL_CAMERA_POSITION_BACK_FACING) {
back_camera = device;
posstr = "[back-facing] ";
}
SDL_Log(" - Camera #%d: %s %s", i, posstr, name);
SDL_free(name);
}
const SDL_CameraDeviceID devid = front_camera ? front_camera : devices[0]; /* no front-facing? just take the first one. */
SDL_free(devices);
if (!devid) {
SDL_Log("No cameras available?");
return -1;
}
SDL_CameraSpec spec = {
.format = SDL_PIXELFORMAT_XBGR1555,
.width = 320,
.height = 240,
.interval_numerator = 1,
.interval_denominator = 30,
};
camera = SDL_OpenCameraDevice(devid, &spec);
if (!camera) {
SDL_Log("Failed to open camera device: %s", SDL_GetError());
return -1;
}
#if BYTES_PER_PIXEL == 4
screen = SDL_CreateSurface(w, h, SDL_PIXELFORMAT_XBGR8888);
#elif BYTES_PER_PIXEL == 2
screen = SDL_CreateSurface(w, h, SDL_PIXELFORMAT_XBGR1555);
#else
#error "unknown pixel format"
#endif
core->setVideoBuffer(core, screen->pixels, screen->pitch / BYTES_PER_PIXEL);
/* Create texture with appropriate format */
texture = SDL_CreateTextureFromSurface(renderer, screen);
if (!texture) {
SDL_Log("Couldn't create texture: %s", SDL_GetError());
return -1;
}
core->setPeripheral(core, mPERIPH_IMAGE_SOURCE, (void*)&gb_img_src);
core->reset(core);
core->setKeys(core, 0);
for (i = 0; i < 600; i++) {
core->runFrame(core);
}
core->setKeys(core, 1); // title screen
core->runFrame(core);
core->setKeys(core, 0);
for (i = 0; i < 25; i++) {
core->runFrame(core);
}
core->setKeys(core, 1); // select 'shoot'
core->runFrame(core);
core->setKeys(core, 0);
for (i = 0; i < 75; i++) {
core->runFrame(core);
}
core->setKeys(core, 1); // select 'shoot' again
core->runFrame(core);
core->setKeys(core, 0);
for (i = 0; i < 100; i++) {
core->runFrame(core);
}
return 0; /* start the main app loop. */
}
static int FlipCamera(void) {
static Uint64 last_flip = 0;
if ((SDL_GetTicks() - last_flip) < 3000) { /* must wait at least 3 seconds between flips. */
return 0;
}
if (camera) {
const SDL_CameraDeviceID current = SDL_GetCameraInstanceID(camera);
SDL_CameraDeviceID nextcam = 0;
if (current == front_camera) {
nextcam = back_camera;
} else if (current == back_camera) {
nextcam = front_camera;
}
if (nextcam) {
SDL_Log("Flip camera!");
if (frame_current) {
SDL_ReleaseCameraFrame(camera, frame_current);
frame_current = NULL;
}
SDL_CloseCamera(camera);
camera = SDL_OpenCameraDevice(nextcam, NULL);
if (!camera) {
SDL_Log("Failed to open camera device: %s", SDL_GetError());
return -1;
}
last_flip = SDL_GetTicks();
}
}
return 0;
}
int SDL_AppEvent(const SDL_Event *event) {
switch (event->type) {
case SDL_EVENT_KEY_DOWN: {
const SDL_Keycode sym = event->key.keysym.sym;
if (sym == SDLK_ESCAPE || sym == SDLK_AC_BACK) {
SDL_Log("Key : Escape!");
return 1;
} else if (sym == SDLK_SPACE) {
FlipCamera();
return 0;
}
break;
}
case SDL_EVENT_MOUSE_BUTTON_DOWN:
/* !!! FIXME: only flip if clicked in the area of a "flip" icon. */
return FlipCamera();
case SDL_EVENT_QUIT:
SDL_Log("Quit!");
return 1;
case SDL_EVENT_CAMERA_DEVICE_APPROVED:
SDL_Log("Camera approved!");
if (SDL_GetCameraFormat(camera, &spec) < 0) {
SDL_Log("Couldn't get camera spec: %s", SDL_GetError());
return -1;
}
break;
case SDL_EVENT_CAMERA_DEVICE_DENIED:
SDL_Log("Camera denied!");
return -1;
}
return 0;
}
int SDL_AppIterate(void) {
SDL_SetRenderDrawColor(renderer, 0x99, 0x99, 0x99, 255);
SDL_RenderClear(renderer);
Uint64 timestampNS = 0;
SDL_Surface *frame_next = camera ? SDL_AcquireCameraFrame(camera, &timestampNS) : NULL;
if (frame_next) {
if (frame_current) {
if (SDL_ReleaseCameraFrame(camera, frame_current) < 0) {
SDL_Log("err SDL_ReleaseCameraFrame: %s", SDL_GetError());
}
}
SDL_Log("new frame %d x %d %s", frame_next->w, frame_next->h, SDL_GetPixelFormatName(frame_next->format->format));
/* It's not needed to keep the frame once updated the texture is updated.
* But in case of 0-copy, it's needed to have the frame while using the texture.
*/
frame_current = frame_next;
texture_updated = SDL_FALSE;
}
core->runFrame(core);
/* Update SDL_Texture with last video frame (only once per new frame) */
if (frame_current && !texture_updated) {
// if (scaled) SDL_UpdateTexture(texture, NULL, scaled->pixels, scaled->pitch);
SDL_UpdateTexture(texture, NULL, screen->pixels, screen->pitch);
texture_updated = SDL_TRUE;
}
SDL_RenderTexture(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
return 0; /* keep iterating. */
}
void SDL_AppQuit(void) {
mCoreConfigDeinit(&core->config);
core->deinit(core);
SDL_ReleaseCameraFrame(camera, frame_current);
SDL_CloseCamera(camera);
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
}

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mgba Submodule

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Subproject commit 3571b112dc821d3612e5073afb8b6be41a35dc55