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|
const std = @import("std");
const os = std.os.linux;
const Card = @import("../card.zig").Card;
const Drm = @import("../request.zig").Drm;
const PixelFormat = @import("pixelformat.zig").PixelFormat;
const cerror = @import("../../cerror.zig");
const CreateDumb = extern struct {
height: u32,
width: u32,
bpp: u32,
flags: u32,
handle: u32,
pitch: u32,
size: u32,
};
const FrameBufferCmd2 = extern struct {
id: u32,
width: u32,
height: u32,
pixel_format: PixelFormat,
flags: u32,
handles: [4]u32,
pitches: [4]u32,
offsets: [4]u32,
modifier: [4]u32,
};
const MapDumb = extern struct {
handle: u32,
__padding: u32,
offset: i64,
};
pub const DoubleBuffer = struct {
const Self = @This();
back: FrameBuffer,
front: FrameBuffer,
pub fn init(card: *Card, width: u32, height: u32, bpp: u32) !Self {
return .{
.back = try FrameBuffer.init(card, width, height, bpp),
.front = try FrameBuffer.init(card, width, height, bpp),
};
}
pub fn swap(self: *Self) void {
const back_data = self.back.data;
self.back.data = self.front.data;
self.front.data = back_data;
const back_id = self.back.id;
self.back.id = self.front.id;
self.front.id = back_id;
}
pub fn deinit(self: *Self) void {
self.back.deinit();
self.front.deinit();
}
pub fn buffer(self: *Self) *FrameBuffer {
return &self.back;
}
pub fn crtc_buffer(self: *Self) *FrameBuffer {
return &self.front;
}
};
pub const Pixel = packed struct(u32) {
blue: u8,
green: u8,
red: u8,
_padding: u8 = 0x0,
};
pub const FrameBuffer = struct {
const Self = @This();
card: *Card,
id: u32,
width: u32,
height: u32,
bpp: u32,
stride: u32,
data_size: u64,
canvas_size: u64,
handle: u32,
data: [*]volatile Pixel,
pub fn init(card: *Card, width: u32, height: u32, bpp: u32) !Self {
var create_dumb = std.mem.zeroInit(CreateDumb, .{
.width = width,
.height = height,
.bpp = bpp,
});
try Drm.create_dumb.request(
card.file.handle,
CreateDumb,
&create_dumb
);
var fb = Self {
.id = 0,
.width = create_dumb.width,
.height = create_dumb.height,
.bpp = create_dumb.bpp,
.stride = create_dumb.pitch,
.data_size = create_dumb.size,
.canvas_size = create_dumb.size / (bpp / 8),
.handle = create_dumb.handle,
.data = undefined,
.card = card,
};
var buffer_cmd = FrameBufferCmd2 {
.id = 0,
.width = fb.width,
.height = fb.height,
.pixel_format = PixelFormat.xrgb8888,
.flags = 0,
.handles = [_] u32 { fb.handle, 0, 0, 0 },
.pitches = [_] u32 { fb.stride, 0, 0, 0 },
.offsets = [_] u32 { 0, 0, 0, 0 },
.modifier = [_] u32 { 0, 0, 0, 0 },
};
try Drm.add_frame_buffer2.request(
card.file.handle,
FrameBufferCmd2,
&buffer_cmd
);
fb.id = buffer_cmd.id;
var map_dumb = std.mem.zeroInit(MapDumb, .{ .handle = fb.handle });
try Drm.map_dumb.request(
card.file.handle,
MapDumb,
&map_dumb
);
const address = os.mmap(
null,
fb.data_size,
os.PROT.READ | os.PROT.WRITE,
.{ .TYPE = os.MAP_TYPE.SHARED },
card.file.handle,
map_dumb.offset
);
try cerror.from_usize(address);
fb.data = @ptrFromInt(address);
return fb;
}
pub fn set(self: *Self, x: u32, y: u32, pixel: Pixel) void {
self.data[x + self.width * y] = pixel;
}
pub fn fill(self: *Self, pixel: Pixel) void {
@memset(self.data[0..self.canvas_size], pixel);
}
pub fn deinit(self: *Self) void {
cerror.from_usize(
os.munmap(@ptrCast(@volatileCast(self.data)), self.data_size)
) catch |err| std.debug.panic("munmap failed in frame-buffer: {}", .{err});
Drm.remove_frame_buffer.request(
self.card.file.handle,
u32,
&self.id
) catch @panic("failed to remove frame-buffer");
Drm.destroy_dumb.request(
self.card.file.handle,
u32,
&self.handle
) catch @panic("failed to destroy dumb-buffer");
}
};
|
