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//
// vi/controller.c: Video interface controller.
//
// CEN64: Cycle-Accurate Nintendo 64 Emulator.
// Copyright (C) 2015, Tyler J. Stachecki.
//
// This file is subject to the terms and conditions defined in
// 'LICENSE', which is part of this source code package.
//
#include "common.h"
#include "context.h"
#include "bus/address.h"
#include "bus/controller.h"
#include "device/device.h"
#include "os/main.h"
#include "timer.h"
#include "ri/controller.h"
#include "vi/controller.h"
#include "vi/render.h"
#include "vi/window.h"
#include "vr4300/interface.h"
#define VI_COUNTER_START (62500000.0 / 60.0) + 1;
#ifdef DEBUG_MMIO_REGISTER_ACCESS
const char *vi_register_mnemonics[NUM_VI_REGISTERS] = {
#define X(reg) #reg,
#include "vi/registers.md"
#undef X
};
#endif
// Reads a word from the VI MMIO register space.
int read_vi_regs(void *opaque, uint32_t address, uint32_t *word) {
struct vi_controller *vi = (struct vi_controller *) opaque;
unsigned offset = address - VI_REGS_BASE_ADDRESS;
enum vi_register reg = (offset >> 2);
// TODO: Possibly a giant hack.
if (vi->regs[VI_V_SYNC_REG] > 0) {
vi->regs[VI_CURRENT_REG] =
(((62500000.0f / 60.0f) + 1) - (vi->counter)) /
(((62500000.0f / 60.0f) + 1) / vi->regs[VI_V_SYNC_REG]);
vi->regs[VI_CURRENT_REG] &= ~0x1;
}
else
vi->regs[VI_CURRENT_REG] = 0;
*word = vi->regs[reg];
debug_mmio_read(vi, vi_register_mnemonics[reg], *word);
return 0;
}
// Advances the controller by one clock cycle.
void vi_cycle(struct vi_controller *vi) {
#ifndef __APPLE__
struct cen64_context c;
#endif
cen64_gl_window window;
size_t copy_size;
struct render_area *ra = &vi->render_area;
struct bus_controller *bus;
float hcoeff, vcoeff;
if (likely(vi->counter-- != 0))
return;
#ifndef __APPLE__
cen64_context_save(&c);
#endif
window = vi->window;
// Calculate the bounding positions.
ra->x.start = vi->regs[VI_H_START_REG] >> 16 & 0x3FF;
ra->x.end = vi->regs[VI_H_START_REG] & 0x3FF;
ra->y.start = vi->regs[VI_V_START_REG] >> 16 & 0x3FF;
ra->y.end = vi->regs[VI_V_START_REG] & 0x3FF;
hcoeff = (float) (vi->regs[VI_X_SCALE_REG] & 0xFFF) / (1 << 10);
vcoeff = (float) (vi->regs[VI_Y_SCALE_REG] & 0xFFF) / (1 << 10);
// Interact with the user interface?
if (likely(window)) {
cen64_mutex_lock(&window->event_mutex);
if (unlikely(window->exit_requested)) {
cen64_mutex_unlock(&window->event_mutex);
device_exit(vi->bus);
}
cen64_mutex_unlock(&window->event_mutex);
cen64_mutex_lock(&window->render_mutex);
// Calculate the height and width of the frame.
window->frame_vres = ra->height =((ra->y.end - ra->y.start) >> 1) * vcoeff;
window->frame_hres = ra->width = ((ra->x.end - ra->x.start)) * hcoeff;
window->frame_hskip = ra->hskip = vi->regs[VI_WIDTH_REG] - ra->width;
window->frame_type = vi->regs[VI_STATUS_REG] & 0x3;
if (window->frame_hres <= 0 || window->frame_vres <= 0)
window->frame_type = 0;
// Copy the frame data into a temporary buffer.
copy_size = sizeof(bus->ri->ram) - (vi->regs[VI_ORIGIN_REG] & 0xFFFFFF);
if (copy_size > sizeof(vi->window->frame_buffer))
copy_size = sizeof(vi->window->frame_buffer);
memcpy(&bus, vi, sizeof(bus));
memcpy(vi->window->frame_buffer,
bus->ri->ram + (vi->regs[VI_ORIGIN_REG] & 0xFFFFFF),
copy_size);
cen64_mutex_unlock(&vi->window->render_mutex);
cen64_gl_window_push_frame(window);
}
else if (++(vi->frame_count) == 60) {
cen64_time current_time;
float ns;
get_time(¤t_time);
ns = compute_time_difference(¤t_time, &vi->last_update_time);
vi->last_update_time = current_time;
vi->frame_count = 0;
printf("VI/s: %.2f\n", (60 / (ns / NS_PER_SEC)));
}
// Raise an interrupt to indicate refresh.
signal_rcp_interrupt(vi->bus->vr4300, MI_INTR_VI);
vi->counter = VI_COUNTER_START;
#ifndef __APPLE__
cen64_context_restore(&c);
#endif
}
// Initializes the VI.
int vi_init(struct vi_controller *vi,
struct bus_controller *bus, bool no_interface) {
vi->counter = VI_COUNTER_START;
vi->bus = bus;
if (!no_interface) {
if (vi_create_window(vi))
return -1;
gl_window_init(vi);
}
return 0;
}
// Writes a word to the VI MMIO register space.
int write_vi_regs(void *opaque, uint32_t address, uint32_t word, uint32_t dqm) {
struct vi_controller *vi = (struct vi_controller *) opaque;
unsigned offset = address - VI_REGS_BASE_ADDRESS;
enum vi_register reg = (offset >> 2);
debug_mmio_write(vi, vi_register_mnemonics[reg], word, dqm);
if (reg == VI_CURRENT_REG)
clear_rcp_interrupt(vi->bus->vr4300, MI_INTR_VI);
else {
vi->regs[reg] &= ~dqm;
vi->regs[reg] |= word;
}
return 0;
}
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