First commit

.gitignore

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+/shrooms-vb
+/shrooms-vb.exe
+.vscode

.gitmodules

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+[submodule "shrooms-vb-core"]
+	path = shrooms-vb-core
+	url = https://git.virtual-boy.com/PVB/shrooms-vb-core.git

README.md

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+# Shrooms VB (native)
+
+An SDL-based implementation of shrooms-vb.
+
+## Setup
+
+Install the following dependencies:
+ - `gcc` (or MinGW on Windows) (or whatever, just set `CC`)
+ - `pkg-config`
+ - sdl2
+
+Run
+```sh
+make build
+```

cli.c

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+#include <cli.h>
+#include <stdio.h>
+
+int parseCLIArgs(int argc, char **argv, CLIArgs *args) {
+    if (argc != 2) {
+        fprintf(stderr, "usage: %s /path/to/rom.vb\n", argv[0]);
+        return 1;
+    }
+    args->filename = argv[1];
+    return 0;
+}

cli.h

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+#ifndef SHROOMS_VB_NATIVE_CLI_
+#define SHROOMS_VB_NATIVE_CLI_
+
+typedef struct {
+    char *filename;
+} CLIArgs;
+
+int parseCLIArgs(int argc, char **argv, CLIArgs *args);
+
+#endif

game.c

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+#include <game.h>
+#include <SDL2/SDL.h>
+#include <time.h>
+
+int sleepNanos(long int ns) {
+    struct timespec time;
+    time.tv_sec = ns / 1000000000;
+    time.tv_nsec = ns % 1000000000;
+    return nanosleep(&time, NULL);
+}
+
+#define MAX_STEP_CLOCKS 20000
+
+int runGame(VB *sim) {
+    uint32_t clocks;
+    SDL_Event event;
+
+    while (1) {
+        clocks = MAX_STEP_CLOCKS;
+        vbEmulate(sim, &clocks);
+        while (SDL_PollEvent(&event)) {
+            if (event.type == SDL_QUIT) {
+                return 0;
+            }
+        }
+        sleepNanos((MAX_STEP_CLOCKS - clocks) * 50);
+    }
+}

game.h

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+#ifndef SHROOMS_VB_NATIVE_GAME_
+#define SHROOMS_VB_NATIVE_GAME_
+
+#include <vb.h>
+
+int runGame(VB *sim);
+
+#endif

main.c

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+#include <cli.h>
+#include <game.h>
+#include <SDL2/SDL.h>
+#include "shrooms-vb-core/core/vb.h"
+#include <stdio.h>
+
+uint8_t *readROM(char *filename, uint32_t *size) {
+    FILE *file = fopen(filename, "rb");
+    uint8_t *rom;
+    long filesize;
+
+    if (!file) {
+        perror("could not open file");
+        return NULL;
+    }
+
+    if (fseek(file, 0, SEEK_END)) {
+        perror("could not seek file end");
+        return NULL;
+    }
+    filesize = ftell(file);
+    if (filesize == -1) {
+        perror("could not read file size");
+        return NULL;
+    }
+    if (fseek(file, 0, SEEK_SET)) {
+        perror("could not seek file start");
+        return NULL;
+    }
+
+    *size = (uint32_t) filesize;
+    rom = malloc(*size);
+    if (!rom) {
+        perror("could not allocate ROM");
+        return NULL;
+    }
+    fread(rom, 1, *size, file);
+    if (ferror(file)) {
+        perror("could not read file");
+        return NULL;
+    }
+    if (fclose(file)) {
+        perror("could not close file");
+        return NULL;
+    }
+
+    return rom;
+}
+
+int main(int argc, char **argv) {
+    VB *sim;
+    uint8_t *rom;
+    uint32_t romSize;
+    SDL_Surface *winSurface;
+    SDL_Window *window;
+    CLIArgs args;
+    int status;
+
+    if (parseCLIArgs(argc, argv, &args)) {
+        return 1;
+    }
+    
+    rom = readROM(args.filename, &romSize);
+    if (!rom) {
+        return 1;
+    }
+
+    sim = malloc(vbSizeOf());
+    vbInit(sim);
+    vbSetCartROM(sim, rom, romSize);
+
+    if (SDL_Init(SDL_INIT_EVERYTHING)) {
+        fprintf(stderr, "Error initializing SDL: %s\n", SDL_GetError());
+        return 1;
+    }
+
+    window = SDL_CreateWindow("Shrooms VB",
+        SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
+        384, 224, SDL_WINDOW_SHOWN | SDL_WINDOW_ALLOW_HIGHDPI);
+    if (!window) {
+        fprintf(stderr, "Error creating window: %s\n", SDL_GetError());
+        return 1;
+    }
+
+    winSurface = SDL_GetWindowSurface(window);
+    if (!winSurface) {
+        fprintf(stderr, "Error getting surface: %s\n", SDL_GetError());
+        return 1;
+    }
+
+    SDL_FillRect(winSurface, NULL, SDL_MapRGB(winSurface->format, 255, 0, 0));
+    SDL_UpdateWindowSurface(window);
+
+    status = runGame(sim);
+
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+
+    return status;
+}

makefile

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+CC?=gcc
+SHROOMSFLAGS=shrooms-vb-core/core/vb.c -I shrooms-vb-core/core
+SDL2FLAGS=$(shell pkg-config sdl2 --cflags --libs)
+
+.PHONY: clean
+clean:
+ifeq ($(OS),WINDOWS_NT)
+	@del shrooms-vb.exe
+else
+	@rm -f shrooms-vb
+endif
+
+build:
+	@$(CC) cli.c game.c main.c -I . \
+		$(SHROOMSFLAGS) $(SDL2FLAGS) \
+		-D POSIX_C_SOURCE=199309L \
+		-o shrooms-vb \
+		-Werror -std=c90 -Wall -Wextra -Wpedantic