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added some comments for doom animation

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peterc-s 2024-10-22 04:00:46 +01:00
parent 020f27b203
commit 5e05d29e0c
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GPG Key ID: 41E806B8F7F83E59
1 changed files with 10 additions and 0 deletions
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10
src/animations/Doom.zig
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@ -53,21 +53,28 @@ pub fn realloc(self: *Doom) !void {
pub fn draw_with_update(self: Doom) void { pub fn draw_with_update(self: Doom) void {
for (0..self.terminal_buffer.width) |x| { for (0..self.terminal_buffer.width) |x| {
for (1..self.terminal_buffer.height) |y| { for (1..self.terminal_buffer.height) |y| {
// get source index
const source = y * self.terminal_buffer.width + x; const source = y * self.terminal_buffer.width + x;
// random number between 0 and 3 inclusive
const random = (self.terminal_buffer.random.int(u16) % 7) & 3; const random = (self.terminal_buffer.random.int(u16) % 7) & 3;
// adjust destination index based on random value
var dest = (source - @min(source, random)) + 1; var dest = (source - @min(source, random)) + 1;
if (self.terminal_buffer.width > dest) dest = 0 else dest -= self.terminal_buffer.width; if (self.terminal_buffer.width > dest) dest = 0 else dest -= self.terminal_buffer.width;
// get source intensity and destination offset
const buffer_source = self.buffer[source]; const buffer_source = self.buffer[source];
const buffer_dest_offset = random & 1; const buffer_dest_offset = random & 1;
if (buffer_source < buffer_dest_offset) continue; if (buffer_source < buffer_dest_offset) continue;
// calculate the destination intensity
var buffer_dest = buffer_source - buffer_dest_offset; var buffer_dest = buffer_source - buffer_dest_offset;
if (buffer_dest > 12) buffer_dest = 0; if (buffer_dest > 12) buffer_dest = 0;
self.buffer[dest] = @intCast(buffer_dest); self.buffer[dest] = @intCast(buffer_dest);
// update terminal
self.terminal_buffer.buffer[dest] = toTermboxCell(FIRE[buffer_dest]); self.terminal_buffer.buffer[dest] = toTermboxCell(FIRE[buffer_dest]);
self.terminal_buffer.buffer[source] = toTermboxCell(FIRE[buffer_source]); self.terminal_buffer.buffer[source] = toTermboxCell(FIRE[buffer_source]);
} }
@ -77,10 +84,13 @@ pub fn draw_with_update(self: Doom) void {
pub fn draw(self: Doom) void { pub fn draw(self: Doom) void {
for (0..self.terminal_buffer.width) |x| { for (0..self.terminal_buffer.width) |x| {
for (1..self.terminal_buffer.height) |y| { for (1..self.terminal_buffer.height) |y| {
// get source index
const source = y * self.terminal_buffer.width + x; const source = y * self.terminal_buffer.width + x;
// get intensity from buffer
const buffer_source = self.buffer[source]; const buffer_source = self.buffer[source];
// set cell to correct fire char
self.terminal_buffer.buffer[source] = toTermboxCell(FIRE[buffer_source]); self.terminal_buffer.buffer[source] = toTermboxCell(FIRE[buffer_source]);
} }
} }