99 lines
3.7 KiB
Text
99 lines
3.7 KiB
Text
# render3d_image.ludic - pictures for the render3d backend: a texture by path (its sRGB bytes as they
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# are, clamped at its edges, loaded again when the file changes) and a cell of a named atlas
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module ludic_ui
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function r3u_tex(path: string) -> int {
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for i in 0 .. len(r3u_tex_paths) {
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if r3u_tex_paths[i] == path { return r3u_tex_fresh(i) }
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}
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push(r3u_tex_paths, path)
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push(r3u_tex_ids, r3u_tex_load(path))
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push(r3u_tex_sizes, Fs.size(path))
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push(r3u_tex_seen, r3u_now())
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return r3u_tex_ids[len(r3u_tex_ids) - 1]
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}
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# a picture is looked at again every half second: a file that has changed (or that was not there,
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# and is now) is loaded again, so an <img> of a photograph written over the old one shows the new one
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function r3u_tex_fresh(i: int) -> int {
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let now = r3u_now()
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if now - r3u_tex_seen[i] < 0.5 and now >= r3u_tex_seen[i] { return r3u_tex_ids[i] }
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r3u_tex_seen[i] = now
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let size = Fs.size(r3u_tex_paths[i])
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if size == r3u_tex_sizes[i] and (r3u_tex_ids[i] != 0 or size < 0) { return r3u_tex_ids[i] }
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if r3u_tex_ids[i] != 0 { gpu_tex_free(r3u_tex_ids[i]) }
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r3u_tex_ids[i] = r3u_tex_load(r3u_tex_paths[i])
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r3u_tex_sizes[i] = size
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return r3u_tex_ids[i]
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}
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# the interface is drawn in sRGB, and a picture's bytes are sRGB, so they are taken as they are
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# (not decoded to linear, which would darken it); clamped at its edges
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function r3u_tex_load(path: string) -> int {
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let t = tex_load(path, false)
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if t != 0 {
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gpu_tex_bind(GPU_TEX2D, t)
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gpu_tex_param(GPU_TEX2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
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gpu_tex_param(GPU_TEX2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
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}
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return t
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}
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# a picture the program has written again, loaded again the next time it is drawn
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export function ui_image_reload(path: string) -> void {
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for i in 0 .. len(r3u_tex_paths) {
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if r3u_tex_paths[i] == path {
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r3u_tex_seen[i] = -1000000.0
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r3u_tex_sizes[i] = -2
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}
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}
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}
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function r3u_image(src: string, x: float, y: float, w: float, h: float, c: int, a: float) -> void {
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var colon = -1
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for i in 0 .. len(src) {
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if colon < 0 and src[i] == 58 { colon = i }
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}
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if colon > 0 {
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let prefix: string = src[0..colon]
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for k in 0 .. len(r3u_atlas) {
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if r3u_atlas[k] == prefix {
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r3u_cell(k, src[colon + 1..len(src)], x, y, w, h, c, a)
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return
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}
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}
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}
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let t = r3u_tex(src)
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if t != 0 { ov_sub(t, int(x), int(y), int(w), int(h), 0.0, 0.0, 1.0, 1.0, r3u_r(c), r3u_g(c), r3u_b(c), a) }
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}
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# a picture's own size, for object-fit; an atlas cell is drawn square
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function r3u_image_w(src: string) -> float {
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if r3u_is_cell(src) { return 1.0 }
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return float(tex_width(r3u_tex(src)))
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}
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function r3u_image_h(src: string) -> float {
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if r3u_is_cell(src) { return 1.0 }
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return float(tex_height(r3u_tex(src)))
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}
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function r3u_is_cell(src: string) -> bool {
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for k in 0 .. len(r3u_atlas) {
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let p = r3u_atlas[k]
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if len(src) > len(p) and src[0..len(p)] == p and src[len(p)] == 58 { return true }
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}
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return false
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}
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function r3u_cell(k: int, name: string, x: float, y: float, w: float, h: float, c: int, a: float) -> void {
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let names = r3u_atlas_names[k]
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var idx = -1
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for i in 0 .. len(names) {
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if names[i] == name { idx = i }
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}
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if idx < 0 and len(name) > 0 and name[0] >= 48 and name[0] <= 57 { idx = int(el_num(name)) }
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if idx < 0 {
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ui_err(`{r3u_atlas[k]}:{name}: the atlas has no such picture`)
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return
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}
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let cols = r3u_atlas_cols[k]
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let rows = r3u_atlas_rows[k]
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let cx = idx % cols
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let cy = idx / cols
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let u0 = float(cx) / float(cols)
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let v0 = float(cy) / float(rows)
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let s = Math.min(w, h)
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ov_sub(r3u_atlas_tex[k], int(x + (w - s) / 2.0), int(y + (h - s) / 2.0), int(s), int(s), u0, v0, u0 + 1.0 / float(cols), v0 + 1.0 / float(rows), r3u_r(c), r3u_g(c), r3u_b(c), a)
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}
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