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Rewrite DOOM animation (fixes #692) 

Signed-off-by: AnErrupTion <anerruption@disroot.org>
This commit is contained in:
AnErrupTion 2025-05-30 16:11:14 +02:00
parent cedb7a3b02
commit 67a4dd8f9d
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1 changed files with 13 additions and 21 deletions
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34
src/animations/Doom.zig
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@ -55,31 +55,21 @@ fn realloc(self: *Doom) anyerror!void {
fn draw(self: *Doom) void {
for (0..self.terminal_buffer.width) |x| {
// We start from 1 so that we always have the topmost line when spreading fire
for (1..self.terminal_buffer.height) |y| {
const source = y * self.terminal_buffer.width + x;
const random = (self.terminal_buffer.random.int(u16) % 7) & 3;
// Get current cell
const from = y * self.terminal_buffer.width + x;
const cell_index = self.buffer[from];
var dest = (source - @min(source, random)) + 1;
if (self.terminal_buffer.width > dest) dest = 0 else dest -= self.terminal_buffer.width;
// Spread fire
const propagate = self.terminal_buffer.random.int(u1);
const to = from - self.terminal_buffer.width; // Get the line above
const buffer_source = self.buffer[source];
const buffer_dest_offset = random & 1;
self.buffer[to] = if (cell_index > 0) cell_index - propagate else cell_index;
if (buffer_source < buffer_dest_offset) continue;
var buffer_dest = buffer_source - buffer_dest_offset;
if (buffer_dest > STEPS) buffer_dest = 0;
self.buffer[dest] = @intCast(buffer_dest);
const dest_y = dest / self.terminal_buffer.width;
const dest_x = dest % self.terminal_buffer.width;
const dest_cell = self.fire[buffer_dest];
dest_cell.put(dest_x, dest_y);
const source_y = source / self.terminal_buffer.width;
const source_x = source % self.terminal_buffer.width;
const source_cell = self.fire[buffer_source];
source_cell.put(source_x, source_y);
// Put the cell
const cell = self.fire[cell_index];
cell.put(x, y);
}
}
}
@ -89,6 +79,8 @@ fn initBuffer(buffer: []u8, width: usize) void {
const slice_start = buffer[0..length];
const slice_end = buffer[length..];
// Initialize the framebuffer in black, except for the "fire source" as the
// last color
@memset(slice_start, 0);
@memset(slice_end, STEPS);
}