godot_voxel/providers/voxel_provider_image.cpp

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#include "voxel_provider_image.h"
VoxelProviderImage::VoxelProviderImage() :
_channel(0) {
}
void VoxelProviderImage::set_image(Ref<Image> im) {
_image = im;
}
Ref<Image> VoxelProviderImage::get_image() const {
return _image;
}
void VoxelProviderImage::set_channel(VoxelBuffer::ChannelId channel) {
_channel = channel;
}
int VoxelProviderImage::get_channel() const {
return _channel;
}
namespace {
inline int umod(int a, int b) {
return ((unsigned int)a - (a < 0)) % (unsigned int)b;
}
inline float get_height_repeat(Image &im, int x, int y) {
return im.get_pixel(umod(x, im.get_width()), umod(y, im.get_height())).r;
}
inline float get_height_blurred(Image &im, int x, int y) {
float h = get_height_repeat(im, x, y);
h += get_height_repeat(im, x + 1, y);
h += get_height_repeat(im, x - 1, y);
h += get_height_repeat(im, x, y + 1);
h += get_height_repeat(im, x, y - 1);
return h * 0.2f;
}
} // namespace
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void VoxelProviderImage::emerge_block(Ref<VoxelBuffer> p_out_buffer, Vector3i origin_in_voxels, int lod) {
int ox = origin_in_voxels.x;
int oy = origin_in_voxels.y;
int oz = origin_in_voxels.z;
Image &image = **_image;
VoxelBuffer &out_buffer = **p_out_buffer;
image.lock();
int x = 0;
int z = 0;
int bs = out_buffer.get_size().x;
int dirt = 1;
float hbase = 50.0;
float hspan = 200.0;
while (z < bs) {
while (x < bs) {
int lx = x << lod;
int lz = z << lod;
if (_channel == VoxelBuffer::CHANNEL_ISOLEVEL) {
float h = get_height_blurred(image, ox + lx, oz + lz) * hspan - hbase;
for (int y = 0; y < bs; ++y) {
int ly = y << lod;
out_buffer.set_voxel_f((oy + ly) - h, x, y, z, _channel);
}
} else {
float h = get_height_repeat(image, ox + lx, oz + lz) * hspan - hbase;
h -= oy;
int ih = int(h);
if (ih > 0) {
if (ih > bs) {
ih = bs;
}
out_buffer.fill_area(dirt, Vector3(x, 0, z), Vector3(x + 1, ih, z + 1), _channel);
}
}
x += 1;
}
z += 1;
x = 0;
}
image.unlock();
}
void VoxelProviderImage::_bind_methods() {
ClassDB::bind_method(D_METHOD("set_image", "image"), &VoxelProviderImage::set_image);
ClassDB::bind_method(D_METHOD("get_image"), &VoxelProviderImage::get_image);
ClassDB::bind_method(D_METHOD("set_channel", "channel"), &VoxelProviderImage::set_channel);
ClassDB::bind_method(D_METHOD("get_channel"), &VoxelProviderImage::get_channel);
ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "image", PROPERTY_HINT_RESOURCE_TYPE, "Image"), "set_image", "get_image");
ADD_PROPERTY(PropertyInfo(Variant::INT, "channel"), "set_channel", "get_channel");
}