Pixel-Composer/scripts/blurSurface/blurSurface.gml
2024-03-16 12:23:47 +07:00

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globalvar GAUSSIAN_COEFF;
GAUSSIAN_COEFF = {};
function surface_blur_init() {
__blur_hori = surface_create(1, 1);
__blur_vert = surface_create(1, 1);
}
function __gaussian_get_kernel(size) {
size = max(1, round(size));
if(struct_has(GAUSSIAN_COEFF, size)) return GAUSSIAN_COEFF[$ 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;
GAUSSIAN_COEFF[$ size] = gau_array;
return gau_array;
}
function surface_apply_gaussian(surface, size, bg = false, bg_c = c_white, sampleMode = 0, overColor = noone) {
var format = surface_get_format(surface);
var _sw = surface_get_width_safe(surface);
var _sh = surface_get_height_safe(surface);
__blur_hori = surface_verify(__blur_hori, _sw, _sh, format);
__blur_vert = surface_verify(__blur_vert, _sw, _sh, format);
size = min(size, 128);
var gau_array = __gaussian_get_kernel(size);
BLEND_OVERRIDE
gpu_set_tex_filter(true);
surface_set_target(__blur_hori);
draw_clear_alpha(bg_c, bg);
shader_set(sh_blur_gaussian);
shader_set_f("dimension", [ _sw, _sh ]);
shader_set_f("weight", gau_array);
shader_set_i("sampleMode", sampleMode);
shader_set_i("size", size);
shader_set_i("horizontal", 1);
shader_set_i("overrideColor", overColor != noone);
shader_set_f("overColor", colToVec4(overColor));
draw_surface_safe(surface, 0, 0);
shader_reset();
surface_reset_target();
surface_set_target(__blur_vert);
draw_clear_alpha(bg_c, bg);
shader_set(sh_blur_gaussian);
shader_set_i("horizontal", 0);
draw_surface_safe(__blur_hori, 0, 0);
shader_reset();
surface_reset_target();
gpu_set_tex_filter(false);
BLEND_NORMAL;
return __blur_vert;
}