Pixel-Composer/scripts/blurSurface/blurSurface.gml
2022-12-27 10:00:50 +07:00

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function surface_apply_gaussian(surface, size, bg = false, bg_c = c_white, clamp_border = false, mask = noone) {
static uni_bor = shader_get_uniform(sh_blur_gaussian, "clamp_border");
static uni_dim = shader_get_uniform(sh_blur_gaussian, "dimension");
static uni_hor = shader_get_uniform(sh_blur_gaussian, "horizontal");
static uni_wei = shader_get_uniform(sh_blur_gaussian, "weight");
static uni_sze = shader_get_uniform(sh_blur_gaussian, "size");
static uni_umk = shader_get_uniform(sh_blur_gaussian, "useMask");
static uni_msk = shader_get_sampler_index(sh_blur_gaussian, "mask");
var hori = surface_create_valid(surface_get_width(surface), surface_get_height(surface));
var vert = surface_create_valid(surface_get_width(surface), surface_get_height(surface));
size = max(1, round(size));
var gau_array = array_create(size);
var we = 0;
var b = 0.3 * ((size - 1) * 0.5 - 1) + 0.8;
for(var i = 0; i < size; i++) {
var _x = i * .5;
gau_array[i] = (1 / sqrt(2 * pi * b)) * exp( -sqr(_x) / (2 * sqr(b)) );
we += i? gau_array[i] * 2 : gau_array[i];
}
for(var i = 0; i < size; i++) {
gau_array[i] /= we;
}
surface_set_target(hori);
draw_clear_alpha(bg_c, bg);
shader_set(sh_blur_gaussian);
shader_set_uniform_f_array(uni_dim, [ surface_get_width(surface), surface_get_height(surface) ]);
shader_set_uniform_f_array(uni_wei, gau_array);
shader_set_uniform_i(uni_bor, clamp_border? 1 : 0);
shader_set_uniform_i(uni_sze, size);
shader_set_uniform_i(uni_hor, 1);
shader_set_uniform_i(uni_umk, is_surface(mask));
texture_set_stage(uni_msk, surface_get_texture(mask));
draw_surface_safe(surface, 0, 0);
shader_reset();
surface_reset_target();
surface_set_target(vert);
draw_clear_alpha(bg_c, bg);
shader_set(sh_blur_gaussian);
shader_set_uniform_i(uni_hor, 0);
draw_surface_safe(hori, 0, 0);
shader_reset();
surface_reset_target();
surface_free(hori);
return vert;
}