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ludic/packages/ludic.render3d/overlay.ludic
Orkuncakilkaya cc89fc37a4 feat(lang): strict numbers in float files; render3d on float 
A numbers float file adapts decimal literals to a fixed operand or slot, and refuses to
promote a computed int to a float implicitly: there it is almost always float bits. Explicit
float(x) is always allowed.

render3d's numbers are float, converted by tools/migrate/floatbits.py - a whole-program
inference of which ints carried IEEE bits (union-find over flows, calls, returns, buffers,
nested buffers and lexical scopes) and a rewriter to operators, Math.* and float literals,
with float_bits / float_from_bits left only where bits really cross (runtime scratch
buffers, mixed buffers). Seed regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-23 17:13:25 +03:00

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# ============================================================================
# overlay.ludic — 2D drawing over the finished frame, in screen pixels with the
# origin top-left (the same space Input.mouse_x/y report): filled rectangles,
# textured quads and text from a baked font atlas (tools/blender/font_build.py).
# Quads are batched into one buffer for the whole frame and uploaded ONCE at ov_end;
# a texture change only closes a draw range. (On Apple's GL every glBufferSubData
# flushes the context and waits for the GPU; uploading per texture change made a HUD
# with dozens of changes wait dozens of times a frame: 26 ms -> 40 ms, sampled.)
# ============================================================================
const OV_MAX_QUADS: int = 6000
const OV_FLOATS: int = 8 # x, y, u, v, r, g, b, a
var ov_prog: int = 0
var ov_mesh: Mesh = null
var ov_vbo: int = 0
var ov_buf: pointer = null
var ov_n: int = 0
var ov_tex: int = 0
var ov_mode: int = 2 # what the next quads read: 0 the image texture, 1 the font, 2 a flat colour
var ov_voff: float = 0.0 # float bits: 4 x ov_mode, added to v (overlay.frag)
var ov_white: int = 0
var ov_font: int = 0
var ov_font_adv: floats = null # float bits, em units, one per glyph in the atlas
var ov_font_n: int = 0 # glyphs in the atlas
# Text is UTF-8, and the atlas says which code points it holds. font.json's "codes" lists
# them in atlas order; an older atlas without it is ASCII from "first" (32) on, which is
# what every font built before this was. ov_font_map[cp] is glyph + 1 for a code point
# under OV_MAP_N (0: not in the atlas); anything above is looked up in the sorted tail.
const OV_MAP_N: int = 8192
var ov_font_map: words = null
var ov_font_hi_cp: words = null # code points >= OV_MAP_N, ascending
var ov_font_hi_g: words = null
var ov_font_hi_n: int = 0
var ov_font_space: int = 0 # the glyph for ' ', and for what has none: '?'
var ov_font_qmark: int = 0
var ov_font_cols: int = 16
var ov_font_rows: int = 6
var ov_font_cell: int = 128 # px per cell in the atlas
var ov_font_em: int = 100 # px per em in the atlas
var ov_pad_x: float = 0.0 # float bits, em
var ov_base_y: float = 0.0
var ov_ready: bool = false
var ov_open: bool = false
var ov_dbg: bool = false
const OV_MAX_RANGES: int = 512
const OV_RANGE_W: int = 7 # texture, first quad, quad count, clip x, y, w, h (w = 0: none)
var ov_ranges: words = null
var ov_nr: int = 0
var ov_range_start: int = 0
var ov_clip_x: int = 0 # the current clip rectangle in screen pixels (top-left origin)
var ov_clip_y: int = 0
var ov_clip_w: int = 0
var ov_clip_h: int = 0
# The interface is sRGB. While the output is HDR10 the overlay draws with its HDR10 variant, which puts
# the interface at the picture's paper white; the SDR program there sent sRGB values as PQ, and the
# menu's yellow read as red on an HDR display.
var ov_prog_sdr: int = 0
var ov_prog_hdr: int = 0
# How bright the interface's white is while HDR10 is on, as a multiple of paper white. It is 1 for the
# interface; a calibration screen draws its test patches at a number of nits with ov_hdr_nits, which
# closes the batch so far - the multiple is one uniform per flush. On an SDR frame it does nothing.
var ov_hdr_scale: float = 0.0 # float bits; 0 until ov_begin sets 1
function ov_hdr_nits(nits: float) -> void {
var s = 1.0
if nits != 0.0 { s = nits / r3d_hdr_paper_nits() }
if s == ov_hdr_scale { return }
if ov_open { ov_flush() }
ov_hdr_scale = s
}
# back to the interface's own white
function ov_hdr_paper() -> void { ov_hdr_nits(0.0) }
function ov_pick_prog() -> void {
if gpu_hdr_active() {
if ov_prog_hdr == 0 {
r3d_program_log("overlay.vert", "overlay.frag", "#define HDR10\n")
ov_prog_hdr = gpu_program("#version 410 core\n#define HDR10\n" + r3d_shader_file("overlay.vert"), "#version 410 core\n#define HDR10\n" + r3d_shader_file("overlay.frag"), "overlay.vert", "overlay.frag", "#define HDR10\n")
}
if ov_prog_hdr != 0 { ov_prog = ov_prog_hdr; return }
}
ov_prog = ov_prog_sdr
}
function overlay_init(font_dir: string) -> bool {
r3d_program_log("overlay.vert", "overlay.frag", "")
ov_prog = gpu_program("#version 410 core\n" + r3d_shader_file("overlay.vert"), "#version 410 core\n" + r3d_shader_file("overlay.frag"), "overlay.vert", "overlay.frag", "")
if ov_prog == 0 { print("overlay: program failed"); return false }
ov_prog_sdr = ov_prog
ov_mesh = gpu_mesh_new()
ov_vbo = gpu_mesh_vertices(ov_mesh, null, gl_bytes_of(OV_MAX_QUADS * 6 * OV_FLOATS), GPU_DYNAMIC)
gpu_mesh_attr(ov_mesh, 0, 2, GPU_F32, OV_FLOATS * 4, 0, false)
gpu_mesh_attr(ov_mesh, 1, 2, GPU_F32, OV_FLOATS * 4, 8, false)
gpu_mesh_attr(ov_mesh, 2, 4, GPU_F32, OV_FLOATS * 4, 16, false)
gpu_mesh_done(ov_mesh)
ov_buf = gl_floats(OV_MAX_QUADS * 6 * OV_FLOATS)
ov_ranges = words(OV_MAX_RANGES * OV_RANGE_W)
ov_white = tex_solid(255, 255, 255, 255)
overlay_font(font_dir)
if ov_font == 0 { print("overlay: no font atlas, text disabled") }
ov_dbg = r3d_env_has("R3D_FONTDBG")
ov_ready = true
return true
}
# Load (or swap to) the font atlas in `font_dir`: font.png and font.json. A game calls it
# again to change fonts at run time - a language whose script the default atlas does not
# carry brings its own. Returns false, and keeps the font it had, if there is none there.
function overlay_font(font_dir: string) -> bool {
let meta = Fs.read_text(font_dir + "/font.json")
if meta == null { return false }
let tex = tex_load_ex(font_dir + "/font.png", false, 0)
if tex == 0 { return false }
let j = Json.parse(meta)
ov_font_cols = jint(j, "cols", 16); ov_font_rows = jint(j, "rows", 6)
ov_font_cell = int(jnum(value_get(j, "cell"))); ov_font_em = int(jnum(value_get(j, "em")))
ov_pad_x = 0.14; ov_base_y = 0.30
if value_has(j, "pad_x") != 0 { ov_pad_x = jnum(value_get(j, "pad_x")) }
if value_has(j, "base_y") != 0 { ov_base_y = jnum(value_get(j, "base_y")) }
let adv = value_get(j, "adv")
let n = value_count(adv)
let first = jint(j, "first", 32)
var codes: Val = null
if value_has(j, "codes") != 0 { codes = value_get(j, "codes") }
ov_font_n = n
ov_font_adv = floats(n + 1)
for i in 0 .. n { ov_font_adv[i] = jnum(value_at(adv, i)) }
ov_font_map = words(OV_MAP_N)
for c in 0 .. OV_MAP_N { ov_font_map[c] = 0 }
ov_font_hi_cp = words(n + 1); ov_font_hi_g = words(n + 1); ov_font_hi_n = 0
for i in 0 .. n {
var cp = first + i
if codes != null and i < value_count(codes) { cp = int(jnum(value_at(codes, i))) }
if cp >= 0 and cp < OV_MAP_N { ov_font_map[cp] = i + 1 }
else if cp >= OV_MAP_N {
# kept ascending: the builder writes code points in order, so this is an append
ov_font_hi_cp[ov_font_hi_n] = cp; ov_font_hi_g[ov_font_hi_n] = i; ov_font_hi_n += 1
}
}
ov_font_space = 0
if ov_font_map[32] > 0 { ov_font_space = ov_font_map[32] - 1 }
ov_font_qmark = ov_font_space
if ov_font_map[63] > 0 { ov_font_qmark = ov_font_map[63] - 1 }
ov_font = tex
return true
}
# The code point starting at sp[i], with the bytes it took in ov_u8_len. A malformed or
# cut-off sequence is one byte of '?', so a string sliced mid-character still draws.
var ov_u8_len: int = 1
function ov_u8(sp: pointer, i: int, n: int) -> int {
let b0 = sp[i] & 255
ov_u8_len = 1
if b0 < 128 { return b0 }
if b0 >= 240 and b0 < 248 and i + 3 < n {
ov_u8_len = 4
return ((b0 & 7) << 18) | ((sp[i + 1] & 63) << 12) | ((sp[i + 2] & 63) << 6) | (sp[i + 3] & 63)
}
if b0 >= 224 and b0 < 240 and i + 2 < n {
ov_u8_len = 3
return ((b0 & 15) << 12) | ((sp[i + 1] & 63) << 6) | (sp[i + 2] & 63)
}
if b0 >= 192 and b0 < 224 and i + 1 < n {
ov_u8_len = 2
return ((b0 & 31) << 6) | (sp[i + 1] & 63)
}
return 63
}
# the atlas glyph for a code point: a control character is a space, a missing one is '?'
function ov_glyph(cp: int) -> int {
if cp < 32 { return ov_font_space }
if cp < OV_MAP_N {
let g = ov_font_map[cp]
if g > 0 { return g - 1 }
return ov_font_qmark
}
var lo = 0
var hi = ov_font_hi_n - 1
while lo <= hi {
let mid = (lo + hi) / 2
if ov_font_hi_cp[mid] == cp { return ov_font_hi_g[mid] }
if ov_font_hi_cp[mid] < cp { lo = mid + 1 } else { hi = mid - 1 }
}
return ov_font_qmark
}
# start drawing onto the screen: blending on, depth off
function ov_begin() -> void {
if not ov_ready { return }
gpu_fb_bind(gpu_screen_fb())
gpu_viewport(0, 0, gl_w, gl_h)
gpu_depth_test(false)
gpu_cull(false)
gpu_blend(true)
gpu_blend_func(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
ov_pick_prog()
gpu_use_program(ov_prog)
u_f2(gpu_uniform(ov_prog, "u_screen"), float(gl_w), float(gl_h))
ov_n = 0; ov_nr = 0; ov_range_start = 0
ov_tex = ov_white
ov_mode = 2; ov_voff = 8.0
ov_clip_w = 0
ov_hdr_scale = 1.0
ov_open = true
}
# everything drawn until ov_unclip stays inside this rectangle (a scrolling list)
function ov_clip(x: int, y: int, w: int, h: int) -> void {
ov_close_range()
ov_clip_x = x; ov_clip_y = y; ov_clip_w = w; ov_clip_h = h
}
function ov_unclip() -> void { ov_close_range(); ov_clip_w = 0 }
# close the current draw range (quads since its start, with the current texture)
function ov_close_range() -> void {
let n = ov_n - ov_range_start
if n <= 0 { return }
if ov_nr >= OV_MAX_RANGES { ov_flush(); return }
let o = ov_nr * OV_RANGE_W
ov_ranges[o] = ov_tex; ov_ranges[o + 1] = ov_range_start; ov_ranges[o + 2] = n
ov_ranges[o + 3] = ov_clip_x; ov_ranges[o + 4] = ov_clip_y; ov_ranges[o + 5] = ov_clip_w; ov_ranges[o + 6] = ov_clip_h
ov_nr += 1
ov_range_start = ov_n
}
# one upload of everything batched so far, then a draw per range
function ov_flush() -> void {
ov_close_range()
if ov_n == 0 { ov_nr = 0; ov_range_start = 0; return }
# The overlay draws onto the screen, whatever was bound since ov_begin: a render-scale change
# rebuilds the scene targets mid-frame and leaves framebuffer 0 bound, and on a headless run
# (where the screen is an offscreen framebuffer) every overlay draw after it was an invalid
# framebuffer operation. Saying the target at each flush is what a render pass says anyway.
gpu_fb_bind(gpu_screen_fb())
gpu_viewport(0, 0, gl_w, gl_h)
ov_pick_prog()
gpu_use_program(ov_prog)
gpu_mesh_bind(ov_mesh)
gpu_buffer_upload(ov_vbo, gl_bytes_of(ov_n * 6 * OV_FLOATS), ov_buf, GPU_STREAM)
var font = ov_font
if font == 0 { font = ov_white }
r3d_bind_2d(ov_prog, "u_font", 1, font)
var hs = ov_hdr_scale
if hs == 0.0 { hs = 1.0 }
u_f(gpu_uniform(ov_prog, "u_hdr_paper"), r3d_hdr_paper_nits())
u_f(gpu_uniform(ov_prog, "u_hdr_scale"), hs)
var last = -1
var clipped = false
for i in 0 .. ov_nr {
let o = i * OV_RANGE_W
let t = ov_ranges[o]
if t != last { r3d_bind_2d(ov_prog, "u_tex", 0, t); last = t }
if ov_ranges[o + 5] > 0 {
clipped = true
gpu_scissor(ov_ranges[o + 3], ov_ranges[o + 4], ov_ranges[o + 5], ov_ranges[o + 6])
} else if clipped { gpu_scissor_off(); clipped = false }
gpu_draw_range(ov_mesh, ov_ranges[o + 1] * 6, ov_ranges[o + 2] * 6)
}
if clipped { gpu_scissor_off() }
gpu_mesh_unbind()
ov_n = 0; ov_nr = 0; ov_range_start = 0
}
function ov_end() -> void {
if not ov_open { return }
ov_flush()
gpu_blend(false)
gpu_depth_test(true)
ov_open = false
}
# Text and flat panels never end a draw: the font atlas stays bound beside the image texture and each
# vertex says which it reads (ov_voff). Only a different image texture closes the range. A panel and
# its label used to alternate the white and font textures, and the HUD was 77-91 draws a frame.
function ov_use_tex(t: int) -> void {
if t != 0 and t == ov_font { ov_mode = 1; ov_voff = 4.0; return }
if t == ov_white { ov_mode = 2; ov_voff = 8.0; return }
ov_mode = 0; ov_voff = 0.0
if t != ov_tex { ov_close_range(); ov_tex = t }
}
# one vertex into the batch
function ov_vert(k: int, x: float, y: float, u: float, v: float, r: float, g: float, b: float, a: float) -> void {
let o = k * OV_FLOATS
gl_put_bits(ov_buf, o, float_bits(x)); gl_put_bits(ov_buf, o + 1, float_bits(y))
gl_put_bits(ov_buf, o + 2, float_bits(u)); gl_put_bits(ov_buf, o + 3, float_bits(v + ov_voff))
gl_put_bits(ov_buf, o + 4, float_bits(r)); gl_put_bits(ov_buf, o + 5, float_bits(g)); gl_put_bits(ov_buf, o + 6, float_bits(b)); gl_put_bits(ov_buf, o + 7, float_bits(a))
}
# a textured quad, float-bit pixel corners and uvs
function ov_quad(x0: float, y0: float, x1: float, y1: float, u0: float, v0: float, u1: float, v1: float, r: float, g: float, b: float, a: float) -> void {
if ov_n >= OV_MAX_QUADS { ov_flush() }
let k = ov_n * 6
ov_vert(k, x0, y0, u0, v0, r, g, b, a)
ov_vert(k + 1, x1, y0, u1, v0, r, g, b, a)
ov_vert(k + 2, x1, y1, u1, v1, r, g, b, a)
ov_vert(k + 3, x0, y0, u0, v0, r, g, b, a)
ov_vert(k + 4, x1, y1, u1, v1, r, g, b, a)
ov_vert(k + 5, x0, y1, u0, v1, r, g, b, a)
ov_n += 1
}
# a filled rectangle at integer pixels; colour as float bits 0..1
function ov_rect(x: int, y: int, w: int, h: int, r: float, g: float, b: float, a: float) -> void {
ov_use_tex(ov_white)
ov_quad(float(x), float(y), float(x + w), float(y + h), 0.0, 0.0, 1.0, 1.0, r, g, b, a)
}
function ov_frame(x: int, y: int, w: int, h: int, t: int, r: float, g: float, b: float, a: float) -> void {
ov_rect(x, y, w, t, r, g, b, a)
ov_rect(x, y + h - t, w, t, r, g, b, a)
ov_rect(x, y, t, h, r, g, b, a)
ov_rect(x + w - t, y, t, h, r, g, b, a)
}
# a whole texture at integer pixels
function ov_image(tex: int, x: int, y: int, w: int, h: int, a: float) -> void {
ov_use_tex(tex)
ov_quad(float(x), float(y), float(x + w), float(y + h), 0.0, 0.0, 1.0, 1.0, 1.0, 1.0, 1.0, a)
}
# the width in pixels of `s` at `size` pixels per em
function ov_text_w(size: int, s: string) -> int {
if ov_font_adv == null { return 0 }
var w = 0.0
let sp: pointer = s # UTF-8 bytes, not one-character strings
let n = len(sp)
var i = 0
while i < n {
let g = ov_glyph(ov_u8(sp, i, n))
i += ov_u8_len
w = w + ov_font_adv[g] * float(size)
}
return int(w)
}
# text with its top-left at (x, y); returns the pen x after it
function ov_text(x: int, y: int, size: int, s: string, r: float, g: float, b: float, a: float) -> int {
if ov_font == 0 { return x }
ov_use_tex(ov_font)
let k = float(size) / float(ov_font_em) # atlas px -> screen px
let cell = float(ov_font_cell) * k
var pen = float(x)
let base = float(y) + float(size) * 0.80
let px = ov_pad_x * float(ov_font_em) * k
let py = ov_base_y * float(ov_font_em) * k
let sp: pointer = s
let n = len(sp)
var i = 0
while i < n {
let c = ov_glyph(ov_u8(sp, i, n))
i += ov_u8_len
if c != ov_font_space {
let cx = c - (c / ov_font_cols) * ov_font_cols
let cy = c / ov_font_cols
let u0 = float(cx) / float(ov_font_cols); let u1 = float(cx + 1) / float(ov_font_cols)
let v0 = float(cy) / float(ov_font_rows); let v1 = float(cy + 1) / float(ov_font_rows)
let x0 = pen - px; let y1 = base + py
ov_quad(x0, y1 - cell, x0 + cell, y1, u0, v0, u1, v1, r, g, b, a)
}
pen = pen + ov_font_adv[c] * float(size)
}
return int(pen)
}
# text with a soft dark shadow under it (HUD over a bright meadow)
function ov_text_sh(x: int, y: int, size: int, s: string, r: float, g: float, b: float, a: float) -> int {
let d = size / 18 + 1
ov_text(x + d, y + d, size, s, 0.0, 0.0, 0.0, a * 0.7)
return ov_text(x, y, size, s, r, g, b, a)
}
function ov_text_center(cx: int, y: int, size: int, s: string, r: float, g: float, b: float, a: float) -> void {
ov_text(cx - ov_text_w(size, s) / 2, y, size, s, r, g, b, a)
}
# text wrapped at `maxw` pixels on spaces; returns the y after the last line
function ov_text_wrap(x: int, y: int, size: int, maxw: int, s: string, r: float, g: float, b: float, a: float) -> int {
let sp: pointer = s
let n = len(sp)
var first = 0
var ly = y
while first < n {
var last_space = -1
var i = first
var stop = n
while i < n {
if sp[i] == 10 { stop = i; break }
if sp[i] == 32 { last_space = i }
let piece: string = s[first .. i + 1]
if ov_text_w(size, piece) > maxw and last_space > first { stop = last_space; break }
i += 1
}
let line: string = s[first .. stop]
ov_text(x, ly, size, line, r, g, b, a)
ly += size * 13 / 10
first = stop
while first < n and (sp[first] == 32 or sp[first] == 10) { first += 1 }
}
return ly
}
# ---- more shapes for a game's interface -------------------------------------------------
# a sub-rectangle of a texture (uv corners as float bits) tinted, at integer pixels
function ov_sub(tex: int, x: int, y: int, w: int, h: int, u0: float, v0: float, u1: float, v1: float, r: float, g: float, b: float, a: float) -> void {
ov_use_tex(tex)
ov_quad(float(x), float(y), float(x + w), float(y + h), u0, v0, u1, v1, r, g, b, a)
}
# a whole texture stretched by nine slices: corners `src` texels wide in a `tw` px square
# texture, drawn `dst` pixels wide, so rounded corners keep their shape at any size
function ov_nine(tex: int, tw: int, src: int, x: int, y: int, w: int, h: int, dst: int, r: float, g: float, b: float, a: float) -> void {
ov_use_tex(tex)
let s = float(src) / float(tw)
let xs = floats(4); let ys = floats(4); let us = floats(4); let vs = floats(4)
xs[0] = float(x); xs[1] = float(x + dst); xs[2] = float(x + w - dst); xs[3] = float(x + w)
ys[0] = float(y); ys[1] = float(y + dst); ys[2] = float(y + h - dst); ys[3] = float(y + h)
us[0] = 0.0; us[1] = s; us[2] = 1.0 - s; us[3] = 1.0
vs[0] = 0.0; vs[1] = s; vs[2] = 1.0 - s; vs[3] = 1.0
for j in 0 .. 3 {
for i in 0 .. 3 { ov_quad(xs[i], ys[j], xs[i + 1], ys[j + 1], us[i], vs[j], us[i + 1], vs[j + 1], r, g, b, a) }
}
free(xs); free(ys); free(us); free(vs)
}
# an arbitrary quad (float-bit pixel corners, clockwise from top-left) of a texture
function ov_quad4(x0: float, y0: float, x1: float, y1: float, x2: float, y2: float, x3: float, y3: float, u0: float, v0: float, u1: float, v1: float, r: float, g: float, b: float, a: float) -> void {
if ov_n >= OV_MAX_QUADS { ov_flush() }
let k = ov_n * 6
ov_vert(k, x0, y0, u0, v0, r, g, b, a)
ov_vert(k + 1, x1, y1, u1, v0, r, g, b, a)
ov_vert(k + 2, x2, y2, u1, v1, r, g, b, a)
ov_vert(k + 3, x0, y0, u0, v0, r, g, b, a)
ov_vert(k + 4, x2, y2, u1, v1, r, g, b, a)
ov_vert(k + 5, x3, y3, u0, v1, r, g, b, a)
ov_n += 1
}
# a line of thickness `t` pixels between two points (float-bit pixels)
function ov_line(x0: float, y0: float, x1: float, y1: float, t: float, r: float, g: float, b: float, a: float) -> void {
ov_use_tex(ov_white)
let dx = x1 - x0; let dy = y1 - y0
let l = Math.max(Math.sqrt(dx * dx + dy * dy), 0.001)
let nx = -dy / l * (t * 0.5); let ny = dx / l * (t * 0.5)
ov_quad4(x0 + nx, y0 + ny, x1 + nx, y1 + ny, x1 - nx, y1 - ny, x0 - nx, y0 - ny, 0.0, 0.0, 1.0, 1.0, r, g, b, a)
}
# a sub-rectangle of a texture rotated by `ang` radians about its centre (cx, cy), `w` x `h` pixels
function ov_sub_rot(tex: int, cx: int, cy: int, w: int, h: int, ang: float, u0: float, v0: float, u1: float, v1: float, r: float, g: float, b: float, a: float) -> void {
ov_use_tex(tex)
let c = Math.cos(ang); let s = Math.sin(ang)
let hw = float(w) * 0.5; let hh = float(h) * 0.5
let fx = float(cx); let fy = float(cy)
# corners: (-hw,-hh) (hw,-hh) (hw,hh) (-hw,hh) rotated
let x0 = fx + (-hw * c - -hh * s); let y0 = fy + (-hw * s + -hh * c)
let x1 = fx + (hw * c - -hh * s); let y1 = fy + (hw * s + -hh * c)
let x2 = fx + (hw * c - hh * s); let y2 = fy + (hw * s + hh * c)
let x3 = fx + (-hw * c - hh * s); let y3 = fy + (-hw * s + hh * c)
ov_quad4(x0, y0, x1, y1, x2, y2, x3, y3, u0, v0, u1, v1, r, g, b, a)
}
# a filled circle approximated by `n` wedges (float-bit centre and radius)
function ov_disc(cx: float, cy: float, rad: float, n: int, r: float, g: float, b: float, a: float) -> void {
ov_use_tex(ov_white)
let step = 2.0 * PI / float(n)
for i in 0 .. n {
let a0 = float(i) * step; let a1 = a0 + step
let ax = cx + Math.cos(a0) * rad; let ay = cy + Math.sin(a0) * rad
let bx = cx + Math.cos(a1) * rad; let by = cy + Math.sin(a1) * rad
ov_quad4(cx, cy, ax, ay, bx, by, cx, cy, 0.0, 0.0, 1.0, 1.0, r, g, b, a)
}
}
# a ring: `n` segments of thickness `t`, from angle a0 for `span` radians (float bits)
function ov_arc(cx: float, cy: float, rad: float, t: float, a0: float, span: float, n: int, r: float, g: float, b: float, a: float) -> void {
let step = span / float(n)
for i in 0 .. n {
let b0 = a0 + float(i) * step; let b1 = b0 + step
ov_line(cx + Math.cos(b0) * rad, cy + Math.sin(b0) * rad, cx + Math.cos(b1) * rad, cy + Math.sin(b1) * rad, t, r, g, b, a)
}
}
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