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#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include "lodepng.h"
#include "gb.h"
#define NUM_FRAMES 600
#define NUM_STEPS 20000
static uint32_t
file_size(
const char * const path
) {
struct stat st;
if (stat(path, &st)) {
perror("stat():");
exit(EXIT_FAILURE);
}
return st.st_size;
}
static const uint8_t *
load(
const char * const path,
uint32_t * const r_file_size
) {
const uint32_t rom_size = file_size(path);
uint8_t *rom_data = malloc(rom_size);
if (!rom_data) {
perror("malloc():");
exit(EXIT_FAILURE);
}
FILE *fh = fopen(path, "rb");
if (!fh) {
perror("fopen():");
exit(EXIT_FAILURE);
}
if (!fread(rom_data, rom_size, 1, fh)) {
perror("fread():");
exit(EXIT_FAILURE);
}
fclose(fh);
if (r_file_size) {
*r_file_size = (uint32_t) rom_size;
}
return rom_data;
}
// buffer for rendered frames
static uint8_t frames[NUM_FRAMES * GB_FRAME_SIZE];
static void
test_render_frames(
const char * const png_path,
const char * const rom_path
) {
// load rom data
uint32_t rom_size = 0;
const uint8_t *rom_data = load(rom_path, &rom_size);
fprintf(stderr, "loaded \"%s\" (%u bytes)\n", rom_path, rom_size);
// init context
gb_t ctx;
gb_init(&ctx, rom_data, rom_size);
fprintf(stderr, "gb context initialized\n");
// render frames
for (size_t j = 0; j < NUM_FRAMES; j++) {
// render frame
gb_frame(&ctx);
// copy frame to buffer
memcpy(frames + GB_FRAME_SIZE * j, gb_get_rgb_frame(&ctx), GB_FRAME_SIZE);
}
// save png
if (lodepng_encode24_file(png_path, frames, 160, 144 * NUM_FRAMES)) {
fprintf(stderr, "lode_png_encode24_file() failed\n");
exit(EXIT_FAILURE);
}
fprintf(stderr, "%d frames rendered\n", NUM_FRAMES);
// free rom data
free((void*) rom_data);
}
const char * const RWS[] = {
"AF",
"BC",
"DE",
"HL",
"SP",
"PC",
NULL
};
static void
gb_dump_context(
const gb_t * const ctx
) {
for (int i = 0; RWS[i]; i++) {
printf("%s%s: 0x%04X", (!i) ? "" : ", ", RWS[i], ctx->cpu.rs[i]);
}
printf("\n");
}
static void
test_execute_steps(
const char * const rom_path
) {
// load rom data
uint32_t rom_size = 0;
const uint8_t *rom_data = load(rom_path, &rom_size);
fprintf(stderr, "loaded \"%s\" (%u bytes)\n", rom_path, rom_size);
// init context
gb_t ctx;
gb_init(&ctx, rom_data, rom_size);
fprintf(stderr, "gb context initialized\n");
// render frames
for (size_t j = 0; j < NUM_STEPS; j++) {
// print context
gb_dump_context(&ctx);
// render frame
gb_step(&ctx);
}
// free rom data
free((void*) rom_data);
}
int main(int argc, char *argv[]) {
// render 600 frames
for (int i = 2; i < argc; i++) {
if (argv[1][0] == 'f') {
test_render_frames("out.png", argv[i]);
} else if (argv[1][0] == 'e') {
test_execute_steps(argv[i]);
} else {
fprintf(stderr, "unknown test: %s\n", argv[i]);
exit(EXIT_FAILURE);
}
}
// return success
return 0;
}
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