Merge pull request 'Color mix animation' (#724) from winlith/colormix into master

Reviewed-on: https://codeberg.org/AnErrupTion/ly/pulls/724
Reviewed-by: AnErrupTion <anerruption@noreply.codeberg.org>

res/config.ini

@@ -30,9 +30,10 @@
 # config) will be used by Ly for fg = 0x0008.
 
 # The active animation
-# none   -> Nothing
-# doom   -> PSX DOOM fire
-# matrix -> CMatrix
+# none     -> Nothing
+# doom     -> PSX DOOM fire
+# matrix   -> CMatrix
+# colormix -> Color mixing shader
 animation = none
 
 # Stop the animation after some time
@@ -90,6 +91,15 @@ clock = null
 # CMatrix animation foreground color id
 cmatrix_fg = 0x0003
 
+# Color mixing animation first color id
+colormix_col1 = 0x0002
+
+# Color mixing animation second color id
+colormix_col2 = 0x0005
+
+# Color mixing animation third color id
+colormix_col3 = 0x0001
+
 # Console path
 console_dev = /dev/console
 

src/animations/ColorMix.zig

@@ -0,0 +1,76 @@
+const math = @import("std").math;
+const TerminalBuffer = @import("../tui/TerminalBuffer.zig");
+const utils = @import("../tui/utils.zig");
+
+const ColorMix = @This();
+
+const Vec2 = @Vector(2, f32);
+
+const time_scale: f32 = 0.01;
+const palette_len: usize = 12;
+
+fn length(vec: Vec2) f32 {
+    return math.sqrt(vec[0] * vec[0] + vec[1] * vec[1]);
+}
+
+terminal_buffer: *TerminalBuffer,
+frames: u64,
+pattern_cos_mod: f32,
+pattern_sin_mod: f32,
+palette: [palette_len]utils.Cell,
+
+pub fn init(terminal_buffer: *TerminalBuffer, col1: u16, col2: u16, col3: u16) ColorMix {
+    return .{
+        .terminal_buffer = terminal_buffer,
+        .frames = 0,
+        .pattern_cos_mod = terminal_buffer.random.float(f32) * math.pi * 2.0,
+        .pattern_sin_mod = terminal_buffer.random.float(f32) * math.pi * 2.0,
+        .palette = [palette_len]utils.Cell{
+            utils.initCell(0x2588, col1, col2),
+            utils.initCell(0x2593, col1, col2),
+            utils.initCell(0x2592, col1, col2),
+            utils.initCell(0x2591, col1, col2),
+            utils.initCell(0x2588, col2, col3),
+            utils.initCell(0x2593, col2, col3),
+            utils.initCell(0x2592, col2, col3),
+            utils.initCell(0x2591, col2, col3),
+            utils.initCell(0x2588, col3, col1),
+            utils.initCell(0x2593, col3, col1),
+            utils.initCell(0x2592, col3, col1),
+            utils.initCell(0x2591, col3, col1),
+        },
+    };
+}
+
+pub fn draw(self: *ColorMix) void {
+    self.frames +%= 1;
+    const time: f32 = @as(f32, @floatFromInt(self.frames)) * time_scale;
+
+    for (0..self.terminal_buffer.width) |x| {
+        for (0..self.terminal_buffer.height) |y| {
+            var uv: Vec2 = .{
+                @as(f32, @floatFromInt(@as(i32, @intCast(x)) * 2 - @as(i32, @intCast(self.terminal_buffer.width)))) / @as(f32, @floatFromInt(self.terminal_buffer.height * 2)),
+                @as(f32, @floatFromInt(@as(i32, @intCast(y)) * 2 - @as(i32, @intCast(self.terminal_buffer.height)))) / @as(f32, @floatFromInt(self.terminal_buffer.height)),
+            };
+
+            var uv2: Vec2 = @splat(uv[0] + uv[1]);
+
+            for (0..3) |_| {
+                uv2 += uv + @as(Vec2, @splat(length(uv)));
+                uv += @as(Vec2, @splat(0.5)) * Vec2{
+                    math.cos(self.pattern_cos_mod + uv2[1] * 0.2 + time * 0.1),
+                    math.sin(self.pattern_sin_mod + uv2[0] - time * 0.1),
+                };
+                uv -= @splat(1.0 * math.cos(uv[0] + uv[1]) - math.sin(uv[0] * 0.7 - uv[1]));
+            }
+
+            const cell = self.palette[@as(usize, @intFromFloat(math.floor(length(uv) * 5.0))) % palette_len];
+            const screen_index: usize = y * self.terminal_buffer.width + x;
+            self.terminal_buffer.buffer[screen_index] = .{
+                .ch = cell.ch,
+                .fg = cell.fg,
+                .bg = cell.bg,
+            };
+        }
+    }
+}

src/config/Config.zig

@@ -22,6 +22,9 @@ brightness_up_key: []const u8 = "F6",
 clear_password: bool = false,
 clock: ?[:0]const u8 = null,
 cmatrix_fg: u16 = 3,
+colormix_col1: u16 = 2,
+colormix_col2: u16 = 5,
+colormix_col3: u16 = 1,
 console_dev: []const u8 = "/dev/console",
 default_input: Input = .login,
 error_bg: u16 = 0,

src/enums.zig

@@ -2,6 +2,7 @@ pub const Animation = enum {
     none,
     doom,
     matrix,
+    colormix,
 };
 
 pub const DisplayServer = enum {
@@ -27,4 +28,4 @@ pub const Bigclock = enum {
     none,
     en,
     fa,
-};
+};

src/main.zig

@@ -8,6 +8,7 @@ const bigclock = @import("bigclock.zig");
 const interop = @import("interop.zig");
 const Doom = @import("animations/Doom.zig");
 const Matrix = @import("animations/Matrix.zig");
+const ColorMix = @import("animations/ColorMix.zig");
 const TerminalBuffer = @import("tui/TerminalBuffer.zig");
 const Session = @import("tui/components/Session.zig");
 const Text = @import("tui/components/Text.zig");
@@ -321,17 +322,20 @@ pub fn main() !void {
     // Initialize the animation, if any
     var doom: Doom = undefined;
     var matrix: Matrix = undefined;
+    var color_mix: ColorMix = undefined;
 
     switch (config.animation) {
         .none => {},
         .doom => doom = try Doom.init(allocator, &buffer),
         .matrix => matrix = try Matrix.init(allocator, &buffer, config.cmatrix_fg),
+        .colormix => color_mix = ColorMix.init(&buffer, config.colormix_col1, config.colormix_col2, config.colormix_col3),
     }
     defer {
         switch (config.animation) {
             .none => {},
             .doom => doom.deinit(),
             .matrix => matrix.deinit(),
+            .colormix => {},
         }
     }
 
@@ -383,6 +387,7 @@ pub fn main() !void {
                     .matrix => matrix.realloc() catch {
                         try info_line.addMessage(lang.err_alloc, config.error_bg, config.error_fg);
                     },
+                    .colormix => {},
                 }
 
                 update = true;
@@ -400,6 +405,7 @@ pub fn main() !void {
                         .none => {},
                         .doom => doom.draw(),
                         .matrix => matrix.draw(),
+                        .colormix => color_mix.draw(),
                     }
                 }
 
@@ -560,6 +566,7 @@ pub fn main() !void {
                     .none => {},
                     .doom => doom.deinit(),
                     .matrix => matrix.deinit(),
+                    .colormix => {},
                 }
             }
         } else if (config.bigclock != .none and config.clock == null) {