virtualx-engine/modules/noise/noise.cpp

/*************************************************************************/
/*  noise.cpp                                                            */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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#include "noise.h"

Ref<Image> Noise::get_seamless_image(int p_width, int p_height, bool p_invert, real_t p_blend_skirt) {
	int skirt_width = p_width * p_blend_skirt;
	int skirt_height = p_height * p_blend_skirt;
	int src_width = p_width + skirt_width;
	int src_height = p_height + skirt_height;

	Ref<Image> src = get_image(src_width, src_height, p_invert);
	bool grayscale = (src->get_format() == Image::FORMAT_L8);
	if (grayscale) {
		return _generate_seamless_image<uint8_t>(src, p_width, p_height, p_invert, p_blend_skirt);
	} else {
		return _generate_seamless_image<uint32_t>(src, p_width, p_height, p_invert, p_blend_skirt);
	}
}

// Template specialization for faster grayscale blending.
template <>
uint8_t Noise::_alpha_blend<uint8_t>(uint8_t p_bg, uint8_t p_fg, int p_alpha) const {
	uint16_t alpha = p_alpha + 1;
	uint16_t inv_alpha = 256 - p_alpha;

	return (uint8_t)((alpha * p_fg + inv_alpha * p_bg) >> 8);
}

void Noise::_bind_methods() {
	// Noise functions.
	ClassDB::bind_method(D_METHOD("get_noise_1d", "x"), &Noise::get_noise_1d);
	ClassDB::bind_method(D_METHOD("get_noise_2d", "x", "y"), &Noise::get_noise_2d);
	ClassDB::bind_method(D_METHOD("get_noise_2dv", "v"), &Noise::get_noise_2dv);
	ClassDB::bind_method(D_METHOD("get_noise_3d", "x", "y", "z"), &Noise::get_noise_3d);
	ClassDB::bind_method(D_METHOD("get_noise_3dv", "v"), &Noise::get_noise_3dv);

	// Textures.
	ClassDB::bind_method(D_METHOD("get_image", "width", "height", "invert"), &Noise::get_image, DEFVAL(false));
	ClassDB::bind_method(D_METHOD("get_seamless_image", "width", "height", "invert", "skirt"), &Noise::get_seamless_image, DEFVAL(false), DEFVAL(0.1));
}