v/vlib/sokol/sapp/sapp_v.c.v

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module sapp
import os
// v_sapp_gl_read_rgba_pixels reads pixles from the OpenGL buffer into `pixels`.
fn C.v_sapp_gl_read_rgba_pixels(x int, y int, width int, height int, pixels charptr)
// screenshot takes a screenshot of the current window.
[inline]
pub fn screenshot(path string) ? {
if !path.ends_with('.ppm') {
return error(@MOD + '.' + @FN + ' currently only supports .ppm files.')
}
w := width()
h := height()
size := w * h * 4 //
mut pixels := []byte{len: size, init: 0}
C.v_sapp_gl_read_rgba_pixels(0, 0, w, h, pixels.data)
// TODO use separate thread for writing the data
// TODO use stbi to support more formats
// stbi.write_png(path, w, h, components, pixels.data, 3 * w)
// stbi.write_tga(path, w, h, components, pixels.data)
write_rgba_to_ppm(path, w, h, 4, pixels) ?
unsafe {
pixels.free()
}
}
// write_rgba_to_ppm writes `pixels` data in RGBA format to PPM3 format.
fn write_rgba_to_ppm(path string, w int, h int, components int, pixels []byte) ? {
mut f_out := os.create(path) ?
f_out.writeln('P3') ?
f_out.writeln('$w $h') ?
f_out.writeln('255') ?
for i := h - 1; i >= 0; i-- {
for j := 0; j < w; j++ {
idx := i * w * components + j * components
r := int(pixels[idx])
g := int(pixels[idx + 1])
b := int(pixels[idx + 2])
f_out.write_string('$r $g $b ') ?
}
}
f_out.close()
}