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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 SKIP_STEPS 1000000
#define NUM_STEPS 300000
#define UNUSED(a) ((void) (a))
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
on_set_rom_bank(
const gb_t * const ctx,
const uint16_t bank
) {
printf("set rom bank: bank = %u, PC = %04x\n", bank, ctx->cpu.rs[5]);
}
static void
on_set_ram_bank(
const gb_t * const ctx,
const uint16_t bank
) {
printf("set ram bank: bank = %u, PC = %04x\n", bank, ctx->cpu.rs[5]);
}
static void
on_vblank(
const gb_t * const ctx
) {
printf("vblank: PC = %04x\n", ctx->cpu.rs[5]);
}
static void
on_hblank(
const gb_t * const ctx
) {
printf("hblank: PC = %04x\n", ctx->cpu.rs[5]);
}
static void
on_timer(
const gb_t * const ctx
) {
printf("timer: PC = %04x\n", ctx->cpu.rs[5]);
}
/*
* static void
* on_gpu_step(
* const gb_t * const ctx
* ) {
* printf("gpu step: gpu clock = 0x%04x\n", ctx->gpu.clock);
* }
*/
static void
on_gpu_set_mode(
const gb_t * const ctx,
const uint8_t mode
) {
UNUSED(ctx);
printf("gpu mode: %u, line = %u\n", mode, ctx->gpu.line);
}
static void
on_set_cpu_state(
const gb_t * const ctx,
const gb_cpu_state_t state
) {
printf("cpu state: PC = %04x, state = %d\n", ctx->cpu.rs[5], state);
}
static void
on_rst(
const gb_t * const ctx,
const uint16_t addr
) {
UNUSED(ctx);
printf("rst: addr = %04x\n", addr);
}
static const gb_config_t
EXECUTE_CONFIG = {
.on_set_rom_bank = on_set_rom_bank,
.on_set_ram_bank = on_set_ram_bank,
.on_vblank = on_vblank,
.on_hblank = on_hblank,
.on_timer = on_timer,
// .on_gpu_step = on_gpu_step,
.on_gpu_set_mode = on_gpu_set_mode,
.on_set_cpu_state = on_set_cpu_state,
.on_rst = on_rst,
};
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, NULL, 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(
gb_t * const ctx
) {
for (int i = 0; RWS[i]; i++) {
printf("%s:%04X ", RWS[i], ctx->cpu.rs[i]);
}
char buf[128];
size_t buf_len = sizeof(buf);
if (gb_disasm(ctx, buf, &buf_len)) {
printf("%s\n", buf);
} else {
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, &EXECUTE_CONFIG, rom_data, rom_size);
fprintf(stderr, "gb context initialized\n");
#ifdef SKIP_STEPS
for (size_t i = 0; i < SKIP_STEPS; i++) {
// step cpu
gb_step(&ctx);
}
#endif /* SKIP_STEPS */
// run cpu
for (size_t i = 0; i < NUM_STEPS; i++) {
// print context
gb_dump_context(&ctx);
// step cpu
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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