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Skip loading menu ROM if Nuklear UI is enabled. Allow disabling Nuklear UI in favor of old menu ROM both at compile time and in config. Fall back to ROM UI if GL is unavailable
author Michael Pavone <pavone@retrodev.com>
date Sat, 25 Nov 2017 20:43:20 -0800
parents 8464a3f09b94
children ce1f93be0104
line wrap: on
line source

#include <string.h>
#include <stdlib.h>
#include <stddef.h>
#include "sms.h"
#include "blastem.h"
#include "render.h"
#include "util.h"
#include "debug.h"
#include "saves.h"

static void *memory_io_write(uint32_t location, void *vcontext, uint8_t value)
{
	z80_context *z80 = vcontext;
	sms_context *sms = z80->system;
	if (location & 1) {
		uint8_t fuzzy_ctrl_0 = sms->io.ports[0].control, fuzzy_ctrl_1 = sms->io.ports[1].control;
		io_control_write(sms->io.ports, (~value) << 5 & 0x60, z80->current_cycle);
		fuzzy_ctrl_0 |= sms->io.ports[0].control;
		io_control_write(sms->io.ports+1, (~value) << 3 & 0x60, z80->current_cycle);
		fuzzy_ctrl_1 |= sms->io.ports[1].control;
		if (
			(fuzzy_ctrl_0 & 0x40 & (sms->io.ports[0].output ^ (value << 1)) & (value << 1))
			|| (fuzzy_ctrl_0 & 0x40 & (sms->io.ports[1].output ^ (value >> 1)) & (value >> 1))
		) {
			//TH is an output and it went from 0 -> 1
			vdp_run_context(sms->vdp, z80->current_cycle);
			vdp_latch_hv(sms->vdp);
		}
		io_data_write(sms->io.ports, value << 1, z80->current_cycle);
		io_data_write(sms->io.ports + 1, value >> 1, z80->current_cycle);
	} else {
		//TODO: memory control write
	}
	return vcontext;
}

static uint8_t hv_read(uint32_t location, void *vcontext)
{
	z80_context *z80 = vcontext;
	sms_context *sms = z80->system;
	vdp_run_context(sms->vdp, z80->current_cycle);
	uint16_t hv = vdp_hv_counter_read(sms->vdp);
	if (location & 1) {
		return hv;
	} else {
		return hv >> 8;
	}
}

static void *sms_psg_write(uint32_t location, void *vcontext, uint8_t value)
{
	z80_context *z80 = vcontext;
	sms_context *sms = z80->system;
	psg_run(sms->psg, z80->current_cycle);
	psg_write(sms->psg, value);
	return vcontext;
}

static void update_interrupts(sms_context *sms)
{
	uint32_t vint = vdp_next_vint(sms->vdp);
	uint32_t hint = vdp_next_hint(sms->vdp);
	sms->z80->int_pulse_start = vint < hint ? vint : hint;
}

static uint8_t vdp_read(uint32_t location, void *vcontext)
{
	z80_context *z80 = vcontext;
	sms_context *sms = z80->system;
	vdp_run_context(sms->vdp, z80->current_cycle);
	if (location & 1) {
		uint8_t ret = vdp_control_port_read(sms->vdp);
		sms->vdp->flags2 &= ~(FLAG2_VINT_PENDING|FLAG2_HINT_PENDING);
		update_interrupts(sms);
		return ret;
	} else {
		return vdp_data_port_read_pbc(sms->vdp);
	}
}

static void *vdp_write(uint32_t location, void *vcontext, uint8_t value)
{
	z80_context *z80 = vcontext;
	sms_context *sms = z80->system;
	if (location & 1) {
		vdp_run_context_full(sms->vdp, z80->current_cycle);
		vdp_control_port_write_pbc(sms->vdp, value);
		update_interrupts(sms);
	} else {
		vdp_run_context(sms->vdp, z80->current_cycle);
		vdp_data_port_write_pbc(sms->vdp, value);
	}
	return vcontext;
}

static uint8_t io_read(uint32_t location, void *vcontext)
{
	z80_context *z80 = vcontext;
	sms_context *sms = z80->system;
	if (location == 0xC0 || location == 0xDC) {
		uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle);
		uint8_t port_b = io_data_read(sms->io.ports+1, z80->current_cycle);
		return (port_a & 0x3F) | (port_b << 6);
	}
	if (location == 0xC1 || location == 0xDD) {
		uint8_t port_a = io_data_read(sms->io.ports, z80->current_cycle);
		uint8_t port_b = io_data_read(sms->io.ports+1, z80->current_cycle);
		return (port_a & 0x40) | (port_b >> 2 & 0xF) | (port_b << 1 & 0x80) | 0x10;
	}
	return 0xFF;
}

static void update_mem_map(uint32_t location, sms_context *sms, uint8_t value)
{
	z80_context *z80 = sms->z80;
	void *old_value;
	if (location) {
		uint32_t idx = location - 1;
		old_value = z80->mem_pointers[idx];
		z80->mem_pointers[idx] = sms->rom + (value << 14 & (sms->rom_size-1));
		if (old_value != z80->mem_pointers[idx]) {
			//invalidate any code we translated for the relevant bank
			z80_invalidate_code_range(z80, idx ? idx * 0x4000 : 0x400, idx * 0x4000 + 0x4000);
		}
	} else {
		old_value = z80->mem_pointers[2];
		if (value & 8) {
			//cartridge RAM is enabled
			z80->mem_pointers[2] = sms->cart_ram + (value & 4 ? (SMS_CART_RAM_SIZE/2) : 0);
		} else {
			//cartridge RAM is disabled
			z80->mem_pointers[2] = sms->rom + (sms->bank_regs[3] << 14 & (sms->rom_size-1));
		}
		if (old_value != z80->mem_pointers[2]) {
			//invalidate any code we translated for the relevant bank
			z80_invalidate_code_range(z80, 0x8000, 0xC000);
		}
	}
}

static void *mapper_write(uint32_t location, void *vcontext, uint8_t value)
{
	z80_context *z80 = vcontext;
	sms_context *sms = z80->system;
	location &= 3;
	sms->ram[0x1FFC + location] = value;
	sms->bank_regs[location] = value;
	update_mem_map(location, sms, value);
	return vcontext;
}

static void *cart_ram_write(uint32_t location, void *vcontext, uint8_t value)
{
	z80_context *z80 = vcontext;
	sms_context *sms = z80->system;
	if (sms->bank_regs[0] & 8) {
		//cartridge RAM is enabled
		location &= 0x3FFF;
		z80->mem_pointers[2][location] = value;
		z80_handle_code_write(0x8000 + location, z80);
	}
	return vcontext;
}

uint8_t debug_commands(system_header *system, char *input_buf)
{
	sms_context *sms = (sms_context *)system;
	switch(input_buf[0])
	{
	case 'v':
		if (input_buf[1] == 'r') {
			vdp_print_reg_explain(sms->vdp);
		} else if (input_buf[1] == 's') {
			vdp_print_sprite_table(sms->vdp);
		} else {
			return 0;
		}
		break;
	}
	return 1;
}

static memmap_chunk io_map[] = {
	{0x00, 0x40, 0xFF, 0, 0, 0, NULL, NULL, NULL, NULL,     memory_io_write},
	{0x40, 0x80, 0xFF, 0, 0, 0, NULL, NULL, NULL, hv_read,  sms_psg_write},
	{0x80, 0xC0, 0xFF, 0, 0, 0, NULL, NULL, NULL, vdp_read, vdp_write},
	{0xC0, 0x100,0xFF, 0, 0, 0, NULL, NULL, NULL, io_read,  NULL}
};

static void set_speed_percent(system_header * system, uint32_t percent)
{
	sms_context *context = (sms_context *)system;
	uint32_t old_clock = context->master_clock;
	context->master_clock = ((uint64_t)context->normal_clock * (uint64_t)percent) / 100;

	psg_adjust_master_clock(context->psg, context->master_clock);
}

void sms_serialize(sms_context *sms, serialize_buffer *buf)
{
	start_section(buf, SECTION_Z80);
	z80_serialize(sms->z80, buf);
	end_section(buf);
	
	start_section(buf, SECTION_VDP);
	vdp_serialize(sms->vdp, buf);
	end_section(buf);
	
	start_section(buf, SECTION_PSG);
	psg_serialize(sms->psg, buf);
	end_section(buf);
	
	start_section(buf, SECTION_SEGA_IO_1);
	io_serialize(sms->io.ports, buf);
	end_section(buf);
	
	start_section(buf, SECTION_SEGA_IO_2);
	io_serialize(sms->io.ports + 1, buf);
	end_section(buf);
	
	start_section(buf, SECTION_MAIN_RAM);
	save_int8(buf, sizeof(sms->ram) / 1024);
	save_buffer8(buf, sms->ram, sizeof(sms->ram));
	end_section(buf);
	
	start_section(buf, SECTION_MAPPER);
	save_int8(buf, 1);//mapper type, 1 for Sega mapper
	save_buffer8(buf, sms->bank_regs, sizeof(sms->bank_regs));
	end_section(buf);
	
	start_section(buf, SECTION_CART_RAM);
	save_int8(buf, SMS_CART_RAM_SIZE / 1024);
	save_buffer8(buf, sms->cart_ram, SMS_CART_RAM_SIZE);
	end_section(buf);
}

static void ram_deserialize(deserialize_buffer *buf, void *vsms)
{
	sms_context *sms = vsms;
	uint32_t ram_size = load_int8(buf) * 1024;
	if (ram_size > sizeof(sms->ram)) {
		fatal_error("State has a RAM size of %d bytes", ram_size);
	}
	load_buffer8(buf, sms->ram, ram_size);
}

static void cart_ram_deserialize(deserialize_buffer *buf, void *vsms)
{
	sms_context *sms = vsms;
	uint32_t ram_size = load_int8(buf) * 1024;
	if (ram_size > SMS_CART_RAM_SIZE) {
		fatal_error("State has a cart RAM size of %d bytes", ram_size);
	}
	load_buffer8(buf, sms->cart_ram, ram_size);
}

static void mapper_deserialize(deserialize_buffer *buf, void *vsms)
{
	sms_context *sms = vsms;
	uint8_t mapper_type = load_int8(buf);
	if (mapper_type != 1) {
		warning("State contains an unrecognized mapper type %d, it may be from a newer version of BlastEm\n", mapper_type);
		return;
	}
	for (int i = 0; i < sizeof(sms->bank_regs); i++)
	{
		sms->bank_regs[i] = load_int8(buf);
		update_mem_map(i, sms, sms->bank_regs[i]);
	}
}

void sms_deserialize(deserialize_buffer *buf, sms_context *sms)
{
	register_section_handler(buf, (section_handler){.fun = z80_deserialize, .data = sms->z80}, SECTION_Z80);
	register_section_handler(buf, (section_handler){.fun = vdp_deserialize, .data = sms->vdp}, SECTION_VDP);
	register_section_handler(buf, (section_handler){.fun = psg_deserialize, .data = sms->psg}, SECTION_PSG);
	register_section_handler(buf, (section_handler){.fun = io_deserialize, .data = sms->io.ports}, SECTION_SEGA_IO_1);
	register_section_handler(buf, (section_handler){.fun = io_deserialize, .data = sms->io.ports + 1}, SECTION_SEGA_IO_2);
	register_section_handler(buf, (section_handler){.fun = ram_deserialize, .data = sms}, SECTION_MAIN_RAM);
	register_section_handler(buf, (section_handler){.fun = mapper_deserialize, .data = sms}, SECTION_MAPPER);
	register_section_handler(buf, (section_handler){.fun = cart_ram_deserialize, .data = sms}, SECTION_CART_RAM);
	//TODO: cart RAM
	while (buf->cur_pos < buf->size)
	{
		load_section(buf);
	}
	z80_invalidate_code_range(sms->z80, 0xC000, 0x10000);
	if (sms->bank_regs[0] & 8) {
		//cart RAM is enabled, invalidate the region in case there is any code there
		z80_invalidate_code_range(sms->z80, 0x8000, 0xC000);
	}
}

static void save_state(sms_context *sms, uint8_t slot)
{
	char *save_path = get_slot_name(&sms->header, slot, "state");
	serialize_buffer state;
	init_serialize(&state);
	sms_serialize(sms, &state);
	save_to_file(&state, save_path);
	printf("Saved state to %s\n", save_path);
	free(save_path);
	free(state.data);
}

static uint8_t load_state_path(sms_context *sms, char *path)
{
	deserialize_buffer state;
	uint8_t ret;
	if ((ret = load_from_file(&state, path))) {
		sms_deserialize(&state, sms);
		free(state.data);
		printf("Loaded %s\n", path);
	}
	return ret;
}

static uint8_t load_state(system_header *system, uint8_t slot)
{
	sms_context *sms = (sms_context *)system;
	char *statepath = get_slot_name(system, slot, "state");
	uint8_t ret;
	if (!sms->z80->native_pc) {
		ret = get_modification_time(statepath) != 0;
		if (ret) {
			system->delayed_load_slot = slot + 1;
		}
		goto done;
		
	}
	ret = load_state_path(sms, statepath);
done:
	free(statepath);
	return ret;
}

static void run_sms(system_header *system)
{
	render_disable_ym();
	sms_context *sms = (sms_context *)system;
	uint32_t target_cycle = sms->z80->current_cycle + 3420*16;
	//TODO: PAL support
	render_set_video_standard(VID_NTSC);
	while (!sms->should_return)
	{
		if (system->delayed_load_slot) {
			load_state(system, system->delayed_load_slot - 1);
			system->delayed_load_slot = 0;
			
		}
		if (system->enter_debugger && sms->z80->pc) {
			system->enter_debugger = 0;
			zdebugger(sms->z80, sms->z80->pc);
		}
		if (sms->z80->nmi_start == CYCLE_NEVER) {
			uint32_t nmi = vdp_next_nmi(sms->vdp);
			if (nmi != CYCLE_NEVER) {
				z80_assert_nmi(sms->z80, nmi);
			}
		}
		z80_run(sms->z80, target_cycle);
		if (sms->z80->reset) {
			z80_clear_reset(sms->z80, sms->z80->current_cycle + 128*15);
		}
		target_cycle = sms->z80->current_cycle;
		vdp_run_context(sms->vdp, target_cycle);
		psg_run(sms->psg, target_cycle);
		
		if (system->save_state) {
			while (!sms->z80->pc) {
				//advance Z80 to an instruction boundary
				z80_run(sms->z80, sms->z80->current_cycle + 1);
			}
			save_state(sms, system->save_state - 1);
			system->save_state = 0;
		}
		
		target_cycle += 3420*16;
		if (target_cycle > 0x10000000) {
			uint32_t adjust = sms->z80->current_cycle - 3420*262*2;
			io_adjust_cycles(sms->io.ports, sms->z80->current_cycle, adjust);
			io_adjust_cycles(sms->io.ports+1, sms->z80->current_cycle, adjust);
			z80_adjust_cycles(sms->z80, adjust);
			vdp_adjust_cycles(sms->vdp, adjust);
			sms->psg->cycles -= adjust;
			target_cycle -= adjust;
		}
	}
	vdp_release_framebuffer(sms->vdp);
	sms->should_return = 0;
	render_enable_ym();
}

static void resume_sms(system_header *system)
{
	sms_context *sms = (sms_context *)system;
	vdp_reacquire_framebuffer(sms->vdp);
	run_sms(system);
}

static void start_sms(system_header *system, char *statefile)
{
	sms_context *sms = (sms_context *)system;
	set_keybindings(&sms->io);
	
	z80_assert_reset(sms->z80, 0);
	z80_clear_reset(sms->z80, 128*15);
	
	if (statefile) {
		load_state_path(sms, statefile);
	}
	
	if (system->enter_debugger) {
		system->enter_debugger = 0;
		zinsert_breakpoint(sms->z80, sms->z80->pc, (uint8_t *)zdebugger);
	}
	
	run_sms(system);
}

static void soft_reset(system_header *system)
{
	sms_context *sms = (sms_context *)system;
	z80_assert_reset(sms->z80, sms->z80->current_cycle);
	sms->z80->target_cycle = sms->z80->sync_cycle = sms->z80->current_cycle;
}

static void free_sms(system_header *system)
{
	sms_context *sms = (sms_context *)system;
	vdp_free(sms->vdp);
	z80_options_free(sms->z80->options);
	free(sms->z80);
	psg_free(sms->psg);
	free(sms);
}

static uint16_t get_open_bus_value(system_header *system)
{
	return 0xFFFF;
}

static void request_exit(system_header *system)
{
	sms_context *sms = (sms_context *)system;
	sms->should_return = 1;
}

static void inc_debug_mode(system_header *system)
{
	sms_context *sms = (sms_context *)system;
	sms->vdp->debug++;
	if (sms->vdp->debug == 7) {
		sms->vdp->debug = 0;
	}
}

static void inc_debug_pal(system_header *system)
{
	sms_context *sms = (sms_context *)system;
	sms->vdp->debug_pal++;
	if (sms->vdp->debug_pal == 4) {
		sms->vdp->debug_pal = 0;
	}
}

static void load_save(system_header *system)
{
	//TODO: Implement me
}

static void persist_save(system_header *system)
{
	//TODO: Implement me
}

sms_context *alloc_configure_sms(system_media *media, uint32_t opts, uint8_t force_region, rom_info *info_out)
{
	memset(info_out, 0, sizeof(*info_out));
	sms_context *sms = calloc(1, sizeof(sms_context));
	uint32_t rom_size = nearest_pow2(media->size);
	memmap_chunk memory_map[6];
	if (media->size > 0xC000)  {
		info_out->map_chunks = 6;
		uint8_t *ram_reg_overlap = sms->ram + sizeof(sms->ram) - 4;
		memory_map[0] = (memmap_chunk){0x0000, 0x0400,  0xFFFF,             0, 0, MMAP_READ,                        media->buffer, NULL, NULL, NULL, NULL};
		memory_map[1] = (memmap_chunk){0x0400, 0x4000,  0xFFFF,             0, 0, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL,     NULL, NULL, NULL, NULL};
		memory_map[2] = (memmap_chunk){0x4000, 0x8000,  0x3FFF,             0, 1, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL,     NULL, NULL, NULL, NULL};
		memory_map[3] = (memmap_chunk){0x8000, 0xC000,  0x3FFF,             0, 2, MMAP_READ|MMAP_PTR_IDX|MMAP_CODE, NULL,     NULL, NULL, NULL, cart_ram_write};
		memory_map[4] = (memmap_chunk){0xC000, 0xFFFC,  sizeof(sms->ram)-1, 0, 0, MMAP_READ|MMAP_WRITE|MMAP_CODE,   sms->ram, NULL, NULL, NULL, NULL};
		memory_map[5] = (memmap_chunk){0xFFFC, 0x10000, 0x0003,             0, 0, MMAP_READ,                        ram_reg_overlap, NULL, NULL, NULL, mapper_write};
	} else {
		info_out->map_chunks = 2;
		memory_map[0] = (memmap_chunk){0x0000, 0xC000,  rom_size-1,         0, 0, MMAP_READ,                      media->buffer,  NULL, NULL, NULL, NULL};
		memory_map[1] = (memmap_chunk){0xC000, 0x10000, sizeof(sms->ram)-1, 0, 0, MMAP_READ|MMAP_WRITE|MMAP_CODE, sms->ram, NULL, NULL, NULL, NULL};
	};
	info_out->map = malloc(sizeof(memmap_chunk) * info_out->map_chunks);
	memcpy(info_out->map, memory_map, sizeof(memmap_chunk) * info_out->map_chunks);
	z80_options *zopts = malloc(sizeof(z80_options));
	init_z80_opts(zopts, info_out->map, info_out->map_chunks, io_map, 4, 15, 0xFF);
	sms->z80 = init_z80_context(zopts);
	sms->z80->system = sms;
	sms->z80->options->gen.debug_cmd_handler = debug_commands;
	
	sms->rom = media->buffer;
	sms->rom_size = rom_size;
	if (info_out->map_chunks > 2) {
		sms->z80->mem_pointers[0] = sms->rom;
		sms->z80->mem_pointers[1] = sms->rom + 0x4000;
		sms->z80->mem_pointers[2] = sms->rom + 0x8000;
		sms->bank_regs[1] = 0;
		sms->bank_regs[2] = 0x4000 >> 14;
		sms->bank_regs[3] = 0x8000 >> 14;
	}
	
	char * lowpass_cutoff_str = tern_find_path(config, "audio\0lowpass_cutoff\0", TVAL_PTR).ptrval;
	uint32_t lowpass_cutoff = lowpass_cutoff_str ? atoi(lowpass_cutoff_str) : 3390;
	
	//TODO: Detect region and pick master clock based off of that
	sms->normal_clock = sms->master_clock = 53693175;
	
	sms->psg = malloc(sizeof(psg_context));
	psg_init(sms->psg, render_sample_rate(), sms->master_clock, 15*16, render_audio_buffer(), lowpass_cutoff);
	
	sms->vdp = malloc(sizeof(vdp_context));
	init_vdp_context(sms->vdp, 0);
	sms->vdp->system = &sms->header;
	
	info_out->save_type = SAVE_NONE;
	info_out->name = strdup(media->name);
	
	setup_io_devices(config, info_out, &sms->io);
	
	sms->header.set_speed_percent = set_speed_percent;
	sms->header.start_context = start_sms;
	sms->header.resume_context = resume_sms;
	sms->header.load_save = load_save;
	sms->header.persist_save = persist_save;
	sms->header.load_state = load_state;
	sms->header.free_context = free_sms;
	sms->header.get_open_bus_value = get_open_bus_value;
	sms->header.request_exit = request_exit;
	sms->header.soft_reset = soft_reset;
	sms->header.inc_debug_mode = inc_debug_mode;
	sms->header.inc_debug_pal = inc_debug_pal;
	sms->header.type = SYSTEM_SMS;
	
	return sms;
}