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// Debug print utility: renders f32 values and ASCII strings using an 8×8 C64-style font.
// Include: #include "debug/debug_print"
//
// Usage:
// col = debug_f32(col, pos.xy, vec2f(10.0, 10.0), my_value);
// col = debug_str(col, pos.xy, vec2f(10.0, 20.0), vec4u(0x48454C4Cu, 0x4F000000u, 0u, 0u), 5u);
//
// debug_f32 format : [-]DDD.DDD (8 chars × 8px wide = 64×8 pixel area)
// range -999.999 to 999.999
// debug_str format : up to 16 printable ASCII chars packed in a vec4u
// each component holds 4 chars (MSB = leftmost char)
// e.g. "Hi!" -> vec4u(0x48692100u, 0u, 0u, 0u), 3u
const ink_color = vec4f(1.0, 1.0, 0.0, 1.0); // yellow
// Returns lit pixel (0 or 1) for ASCII code [0x20-0x7E], row r [0-7], col c [0-7].
// Encoding: 2 u32s per glyph; hi covers rows 0-3, lo covers rows 4-7.
// Within each u32, row r occupies bits [(3-r%4)*8+7 : (3-r%4)*8].
fn _dbg_char(ascii: u32, r: u32, c: u32) -> u32 {
let idx = (clamp(ascii, 0x20u, 0x7Eu) - 0x20u) * 2u;
let data = array<u32, 190>(
// 0x20 ' '
0x00000000u, 0x00000000u,
// 0x21 '!'
0x18181818u, 0x00180000u,
// 0x22 '"'
0x66660000u, 0x00000000u,
// 0x23 '#'
0x36367F36u, 0x7F363600u,
// 0x24 '$'
0x183E603Cu, 0x067C1800u,
// 0x25 '%'
0x62660C18u, 0x30664600u,
// 0x26 '&'
0x386C6876u, 0xDCCC7600u,
// 0x27 "'"
0x18183000u, 0x00000000u,
// 0x28 '('
0x0C183030u, 0x30180C00u,
// 0x29 ')'
0x30180C0Cu, 0x0C183000u,
// 0x2A '*'
0x00663CFFu, 0x3C660000u,
// 0x2B '+'
0x0018187Eu, 0x18180000u,
// 0x2C ','
0x00000000u, 0x00181830u,
// 0x2D '-'
0x0000007Eu, 0x00000000u,
// 0x2E '.'
0x00000000u, 0x00181800u,
// 0x2F '/'
0x00060C18u, 0x30600000u,
// 0x30 '0'
0x3C666E76u, 0x66663C00u,
// 0x31 '1'
0x18381818u, 0x18187E00u,
// 0x32 '2'
0x3C66060Cu, 0x18307E00u,
// 0x33 '3'
0x3C66061Cu, 0x06663C00u,
// 0x34 '4'
0x0C1C2C4Cu, 0x7E0C0C00u,
// 0x35 '5'
0x7E607C06u, 0x06663C00u,
// 0x36 '6'
0x1C30607Cu, 0x66663C00u,
// 0x37 '7'
0x7E060C18u, 0x18181800u,
// 0x38 '8'
0x3C66663Cu, 0x66663C00u,
// 0x39 '9'
0x3C66663Eu, 0x060C3800u,
// 0x3A ':'
0x00181800u, 0x00181800u,
// 0x3B ';'
0x00181800u, 0x00181830u,
// 0x3C '<'
0x0E183060u, 0x30180E00u,
// 0x3D '='
0x00007E00u, 0x007E0000u,
// 0x3E '>'
0x70180C06u, 0x0C187000u,
// 0x3F '?'
0x3C66060Cu, 0x18001800u,
// 0x40 '@'
0x3C666E6Au, 0x6E603C00u,
// 0x41 'A'
0x183C6666u, 0x7E666600u,
// 0x42 'B'
0x7C66667Cu, 0x66667C00u,
// 0x43 'C'
0x3C666060u, 0x60663C00u,
// 0x44 'D'
0x786C6666u, 0x666C7800u,
// 0x45 'E'
0x7E60607Cu, 0x60607E00u,
// 0x46 'F'
0x7E60607Cu, 0x60606000u,
// 0x47 'G'
0x3C66606Eu, 0x66663C00u,
// 0x48 'H'
0x6666667Eu, 0x66666600u,
// 0x49 'I'
0x3C181818u, 0x18183C00u,
// 0x4A 'J'
0x1E0C0C0Cu, 0x0C6C3800u,
// 0x4B 'K'
0x666C7870u, 0x786C6600u,
// 0x4C 'L'
0x60606060u, 0x60607E00u,
// 0x4D 'M'
0xC6EEFED6u, 0xC6C6C600u,
// 0x4E 'N'
0x66767E6Eu, 0x66666600u,
// 0x4F 'O'
0x3C666666u, 0x66663C00u,
// 0x50 'P'
0x7C66667Cu, 0x60606000u,
// 0x51 'Q'
0x3C666666u, 0x663C0E00u,
// 0x52 'R'
0x7C66667Cu, 0x786C6600u,
// 0x53 'S'
0x3C66603Cu, 0x06663C00u,
// 0x54 'T'
0x7E181818u, 0x18181800u,
// 0x55 'U'
0x66666666u, 0x66663C00u,
// 0x56 'V'
0x66666666u, 0x663C1800u,
// 0x57 'W'
0xC6C6C6D6u, 0xFEEEC600u,
// 0x58 'X'
0x66663C18u, 0x3C666600u,
// 0x59 'Y'
0x6666663Cu, 0x18181800u,
// 0x5A 'Z'
0x7E060C18u, 0x30607E00u,
// 0x5B '['
0x3C303030u, 0x30303C00u,
// 0x5C '\'
0x00603018u, 0x0C060000u,
// 0x5D ']'
0x3C0C0C0Cu, 0x0C0C3C00u,
// 0x5E '^'
0x10386CC6u, 0x00000000u,
// 0x5F '_'
0x00000000u, 0x000000FFu,
// 0x60 '`'
0x30180C00u, 0x00000000u,
// 0x61 'a'
0x00003C06u, 0x3E663E00u,
// 0x62 'b'
0x60607C66u, 0x66667C00u,
// 0x63 'c'
0x00003C66u, 0x60663C00u,
// 0x64 'd'
0x06063E66u, 0x66663E00u,
// 0x65 'e'
0x00003C66u, 0x7E603C00u,
// 0x66 'f'
0x0E18187Cu, 0x18181800u,
// 0x67 'g'
0x00003E66u, 0x663E063Cu,
// 0x68 'h'
0x60607C66u, 0x66666600u,
// 0x69 'i'
0x18003818u, 0x18183C00u,
// 0x6A 'j'
0x06000606u, 0x0606663Cu,
// 0x6B 'k'
0x6060666Cu, 0x786C6600u,
// 0x6C 'l'
0x38181818u, 0x18183C00u,
// 0x6D 'm'
0x0000C6EEu, 0xFED6C600u,
// 0x6E 'n'
0x00007C66u, 0x66666600u,
// 0x6F 'o'
0x00003C66u, 0x66663C00u,
// 0x70 'p'
0x00007C66u, 0x667C6060u,
// 0x71 'q'
0x00003E66u, 0x663E0606u,
// 0x72 'r'
0x00007C66u, 0x60606000u,
// 0x73 's'
0x00003C60u, 0x3C063C00u,
// 0x74 't'
0x18187E18u, 0x18180E00u,
// 0x75 'u'
0x00006666u, 0x66663E00u,
// 0x76 'v'
0x00006666u, 0x663C1800u,
// 0x77 'w'
0x0000C6C6u, 0xD6FE6C00u,
// 0x78 'x'
0x0000663Cu, 0x183C6600u,
// 0x79 'y'
0x00006666u, 0x663E063Cu,
// 0x7A 'z'
0x00007E0Cu, 0x18307E00u,
// 0x7B '{'
0x0E181870u, 0x18180E00u,
// 0x7C '|'
0x18181818u, 0x18181800u,
// 0x7D '}'
0x7018180Eu, 0x18187000u,
// 0x7E '~'
0x76DC0000u, 0x00000000u,
);
let word = data[idx + (r / 4u)];
let shift = (3u - (r % 4u)) * 8u + (7u - c);
return (word >> shift) & 1u;
}
// Overlays a f32 value onto col, returning updated RGB.
// pixel_pos : @builtin(position).xy
// origin : top-left corner of text in screen pixels
// value : f32 to display (format: [-]DDD.DDD, 64×8 px)
fn debug_f32(col: vec4f, pixel_pos: vec2f, origin: vec2f, value: f32) -> vec4f {
let lp = pixel_pos - origin;
if (lp.x < 0.0 || lp.x >= 64.0 || lp.y < 0.0 || lp.y >= 8.0) {
return col;
}
let ix = u32(lp.x);
let iy = u32(lp.y);
let char_col = ix / 8u;
let bit_col = ix % 8u;
let neg = value < 0.0;
let abs_val = min(abs(value), 999.999f);
let int_part = u32(abs_val);
let frac_s = min(u32((abs_val - f32(int_part)) * 1000.0 + 0.5), 999u);
var ascii: u32;
switch char_col {
case 0u: { ascii = select(0x20u, 0x2Du, neg); } // ' ' or '-'
case 1u: { ascii = 0x30u + (int_part / 100u) % 10u; } // hundreds
case 2u: { ascii = 0x30u + (int_part / 10u) % 10u; } // tens
case 3u: { ascii = 0x30u + int_part % 10u; } // ones
case 4u: { ascii = 0x2Eu; } // '.'
case 5u: { ascii = 0x30u + (frac_s / 100u) % 10u; } // tenths
case 6u: { ascii = 0x30u + (frac_s / 10u) % 10u; } // hundredths
default: { ascii = 0x30u + frac_s % 10u; } // thousandths
}
return mix(col, ink_color, f32(_dbg_char(ascii, iy, bit_col)));
}
// Overlays an ASCII string onto col, returning updated RGB.
// pixel_pos : @builtin(position).xy
// origin : top-left corner of text in screen pixels
// s : up to 16 chars packed as 4 bytes per u32, big-endian
// s.x = chars 0-3, s.y = chars 4-7, s.z = chars 8-11, s.w = chars 12-15
// len : number of characters to render (1-16)
//
// Example — "Hello" (5 chars, ASCII 0x48 0x65 0x6C 0x6C 0x6F):
// debug_str(col, pos.xy, origin, vec4u(0x48656C6Cu, 0x6F000000u, 0u, 0u), 5u)
fn debug_str(col: vec4f, pixel_pos: vec2f, origin: vec2f, s: vec4u, len: u32) ->
vec4f {
let lp = pixel_pos - origin;
let max_w = f32(len * 8u);
if (lp.x < 0.0 || lp.x >= max_w || lp.y < 0.0 || lp.y >= 8.0) {
return col;
}
let ix = u32(lp.x);
let iy = u32(lp.y);
let char_idx = ix / 8u;
let bit_col = ix % 8u;
// Extract byte from packed vec4u (big-endian: MSB = leftmost char)
let word_idx = char_idx / 4u;
let byte_pos = 3u - (char_idx % 4u); // shift in bytes within the u32
var packed: u32;
switch word_idx {
case 0u: { packed = s.x; }
case 1u: { packed = s.y; }
case 2u: { packed = s.z; }
default: { packed = s.w; }
}
let ascii = (packed >> (byte_pos * 8u)) & 0xFFu;
return mix(col, ink_color, f32(_dbg_char(ascii, iy, bit_col)));
}
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