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const std = @import("std");
const os = std.os.linux;
const drm = @import("../root.zig");
const cerror = @import("../../cerror.zig");
pub const Raw = struct {
const Self = @This();
card: drm.Card,
id: u32,
width: u32,
height: u32,
stride: u32,
handle: u32,
bytes: []volatile u8,
pub fn init(card: drm.Card, width: u32, height: u32) !Self {
var create_dumb = std.mem.zeroInit(drm.request.CreateDumb, .{
.width = width,
.height = height,
.bpp = 32,
});
try card.request(
.create_dumb,
&create_dumb
);
var fb = Self {
.id = 0,
.width = create_dumb.width,
.height = create_dumb.height,
.stride = create_dumb.pitch,
.handle = create_dumb.handle,
.bytes = undefined,
.card = card,
};
var buffer_cmd = drm.request.FrameBufferCmd2 {
.id = 0,
.width = fb.width,
.height = fb.height,
.pixel_format = drm.Pixel.Format.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 card.request(
.add_frame_buffer2,
&buffer_cmd
);
fb.id = buffer_cmd.id;
var map_dumb = std.mem.zeroInit(drm.request.MapDumb, .{ .handle = fb.handle });
try card.request(
.map_dumb,
&map_dumb
);
const address = os.mmap(
null,
create_dumb.size,
os.PROT.READ | os.PROT.WRITE,
.{ .TYPE = os.MAP_TYPE.SHARED },
card.file.handle,
map_dumb.offset
);
try cerror.from_usize(address);
fb.bytes = @as([*]volatile u8, @ptrFromInt(address))[0..create_dumb.size];
return fb;
}
pub fn deinit(self: *Self) void {
cerror.from_usize(
os.munmap(@ptrCast(@volatileCast(self.bytes)), self.bytes.len)
) catch |err| std.debug.panic("munmap failed in frame-buffer: {}", .{err});
self.card.request(
.remove_frame_buffer,
&self.id
) catch @panic("failed to remove frame-buffer");
self.card.request(
.destroy_dumb,
&self.handle
) catch @panic("failed to destroy dumb-buffer");
}
};
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