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feat(ui): implement pausing

This commit is contained in:
Rekai Nyangadzayi Musuka 2023-05-21 15:01:42 -05:00
parent 89671f767e
commit 0204509923
3 changed files with 71 additions and 33 deletions
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17
src/imgui.zig
View File

@ -30,6 +30,7 @@ pub const State = struct {
fps_hist: RingBuffer(u32),
should_quit: bool = false,
emulation: Emulation,
win_stat: WindowStatus = .{},
@ -41,6 +42,12 @@ pub const State = struct {
show_palette: bool = false,
};
const Emulation = union(enum) {
Active,
Inactive,
Transition: enum { Active, Inactive },
};
/// if zba is initialized with a ROM already provided, this initializer should be called
/// with `title_opt` being non-null
pub fn init(allocator: Allocator, title_opt: ?*const [12]u8) !@This() {
@ -48,6 +55,7 @@ pub const State = struct {
return .{
.title = handleTitle(title_opt),
.emulation = if (title_opt == null) .Inactive else .Active,
.fps_hist = RingBuffer(u32).init(history),
};
}
@ -90,6 +98,7 @@ pub fn draw(state: *State, tex_id: GLuint, cpu: *Arm7tdmi) void {
};
state.title = handleTitle(&cpu.bus.pak.title);
state.emulation = .{ .Transition = .Active };
}
}
@ -105,6 +114,14 @@ pub fn draw(state: *State, tex_id: GLuint, cpu: *Arm7tdmi) void {
if (zgui.menuItem("Schedule", .{ .selected = state.win_stat.show_schedule }))
state.win_stat.show_schedule = true;
if (zgui.menuItem("Paused", .{ .selected = state.emulation == .Inactive })) {
state.emulation = switch (state.emulation) {
.Active => .{ .Transition = .Inactive },
.Inactive => .{ .Transition = .Active },
else => state.emulation,
};
}
if (zgui.menuItem("Restart", .{}))
emu.reset(cpu);
}

4
src/main.zig
View File

@ -127,6 +127,10 @@ pub fn main() void {
} else {
var tracker = FpsTracker.init();
// emu should start paused if there's no ROM to run
if (paths.rom == null)
channel.emu.push(.Pause);
const thread = std.Thread.spawn(.{}, emu.run, .{ &cpu, &scheduler, &tracker, &channel }) catch |e| exitln("emu thread panicked: {}", .{e});
defer thread.join();

83
src/platform.zig
View File

@ -121,13 +121,6 @@ pub const Gui = struct {
var win_dim: Dimensions = default_dim;
emu_loop: while (true) {
// `quit` from RunOptions may be modified by the GDBSTUB thread,
// so we want to recognize that it may change to `true` and exit the GUI thread
if (channel.gui.pop()) |event| switch (event) {
.Quit => break :emu_loop,
.Paused => @panic("TODO: We want to peek (and then pop if it's .Quit), not always pop"),
};
// Outside of `SDL.SDL_QUIT` below, the DearImgui UI might signal that the program
// should exit, in which case we should also handle this
if (self.state.should_quit) break :emu_loop;
@ -190,40 +183,64 @@ pub const Gui = struct {
}
}
{
channel.emu.push(.Pause);
defer channel.emu.push(.Resume);
switch (self.state.emulation) {
.Transition => |inner| switch (inner) {
.Active => blk: {
if (channel.gui.peek() == null) break :blk;
if (channel.gui.peek().? != .Paused) break :blk;
// Spin Loop until we know that the emu is paused
wait: while (true) switch (channel.gui.pop() orelse continue) {
.Paused => break :wait,
else => |any| std.debug.panic("[Gui/Channel]: Unhandled Event: {}", .{any}),
};
log.debug("-> Active | {?}", .{channel.gui.peek()});
_ = channel.gui.pop();
// Add FPS count to the histogram
if (tracker) |t| self.state.fps_hist.push(t.value()) catch {};
channel.emu.push(.Resume);
self.state.emulation = .Active;
},
.Inactive => blk: {
if (channel.gui.peek()) |value|
if (value == .Paused) break :blk;
// Draw GBA Screen to Texture
{
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo_id);
defer gl.bindFramebuffer(gl.FRAMEBUFFER, 0);
log.debug("-> Inactive | {?}", .{channel.gui.peek()});
const buf = cpu.bus.ppu.framebuf.get(.Renderer);
gl.viewport(0, 0, gba_width, gba_height);
opengl_impl.drawScreenTexture(emu_tex, prog_id, objects, buf);
}
channel.emu.push(.Pause);
self.state.emulation = .Inactive;
},
},
.Active => {
channel.emu.push(.Pause);
defer channel.emu.push(.Resume);
// Background Colour
const size = zgui.io.getDisplaySize();
gl.viewport(0, 0, @floatToInt(GLsizei, size[0]), @floatToInt(GLsizei, size[1]));
gl.clearColor(0, 0, 0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
// Spin Loop until we know that the emu is paused
wait: while (true) switch (channel.gui.pop() orelse continue) {
.Paused => break :wait,
.Quit => break :emu_loop, // TODO: Ensure this behaves as expected
};
zgui.backend.newFrame(@intToFloat(f32, win_dim.width), @intToFloat(f32, win_dim.height));
imgui.draw(&self.state, out_tex, cpu);
zgui.backend.draw();
// Add FPS count to the histogram
if (tracker) |t| self.state.fps_hist.push(t.value()) catch {};
// Draw GBA Screen to Texture
{
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo_id);
defer gl.bindFramebuffer(gl.FRAMEBUFFER, 0);
const buf = cpu.bus.ppu.framebuf.get(.Renderer);
gl.viewport(0, 0, gba_width, gba_height);
opengl_impl.drawScreenTexture(emu_tex, prog_id, objects, buf);
}
},
.Inactive => {},
}
// Background Colour
const size = zgui.io.getDisplaySize();
gl.viewport(0, 0, @floatToInt(GLsizei, size[0]), @floatToInt(GLsizei, size[1]));
gl.clearColor(0, 0, 0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
zgui.backend.newFrame(@intToFloat(f32, win_dim.width), @intToFloat(f32, win_dim.height));
imgui.draw(&self.state, out_tex, cpu);
zgui.backend.draw();
SDL.SDL_GL_SwapWindow(self.window);
}