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render3d: HUD text, panels and images share a draw - the font stays bound and each vertex says what it reads

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A panel and its label alternated the white and font textures, and every switch closed the overlay's
draw range: 77-91 ranges a frame in town. The font atlas is now bound beside the image texture for the
whole flush, and v carries 4 x the vertex's mode (0 image, 1 font, 2 flat colour) on top of its real
coordinate, so only a different image texture or a clip rectangle closes a range. Town: 24 ranges.
OpenGL frames byte-identical at all five viewpoints; MoltenVK with validation adds no message.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-15 17:14:53 +03:00
parent cdfffa62bb
commit eb1cd3e01a
4 changed files with 33 additions and 21 deletions
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22
packages/ludic.render3d/overlay.ludic
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@ -17,6 +17,8 @@ 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: int = 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: words = null # float bits, em units, one per glyph in the atlas
@ -165,6 +167,7 @@ function ov_begin() -> void {
u_f2(gpu_uniform(ov_prog, "u_screen"), fi(gl_w), fi(gl_h))
ov_n = 0; ov_nr = 0; ov_range_start = 0
ov_tex = ov_white
ov_mode = 2; ov_voff = fi(8)
ov_clip_w = 0
ov_open = true
}
@ -198,18 +201,15 @@ function ov_flush() -> void {
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 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)
var is_font = F_ZERO
if t == ov_font { is_font = F_ONE }
u_f(gpu_uniform(ov_prog, "u_is_font"), is_font)
last = t
}
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])
@ -227,7 +227,13 @@ function ov_end() -> void {
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 = fi(4); return }
if t == ov_white { ov_mode = 2; ov_voff = fi(8); return }
ov_mode = 0; ov_voff = F_ZERO
if t != ov_tex { ov_close_range(); ov_tex = t }
}
@ -235,7 +241,7 @@ function ov_use_tex(t: int) -> void {
function ov_vert(k: int, x: int, y: int, u: int, v: int, r: int, g: int, b: int, a: int) -> void {
let o = k * OV_FLOATS
gl_put_bits(ov_buf, o, x); gl_put_bits(ov_buf, o + 1, y)
gl_put_bits(ov_buf, o + 2, u); gl_put_bits(ov_buf, o + 3, v)
gl_put_bits(ov_buf, o + 2, u); gl_put_bits(ov_buf, o + 3, f_add(v, ov_voff))
gl_put_bits(ov_buf, o + 4, r); gl_put_bits(ov_buf, o + 5, g); gl_put_bits(ov_buf, o + 6, b); gl_put_bits(ov_buf, o + 7, a)
}
# a textured quad, float-bit pixel corners and uvs