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add Image::bumpmap_to_normalmap conversion function

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This commit is contained in:
Neil Graham 2018-02-21 11:43:58 +13:00
parent e3be5bb61d
commit bc7db7a08d
2 changed files with 43 additions and 0 deletions
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42
core/image.cpp
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@ -2271,6 +2271,7 @@ void Image::_bind_methods() {
ClassDB::bind_method(D_METHOD("premultiply_alpha"), &Image::premultiply_alpha);
ClassDB::bind_method(D_METHOD("srgb_to_linear"), &Image::srgb_to_linear);
ClassDB::bind_method(D_METHOD("normalmap_to_xy"), &Image::normalmap_to_xy);
ClassDB::bind_method(D_METHOD("bumpmap_to_normalmap","bump_scale"), &Image::bumpmap_to_normalmap, DEFVAL(1.0));
ClassDB::bind_method(D_METHOD("blit_rect", "src", "src_rect", "dst"), &Image::blit_rect);
ClassDB::bind_method(D_METHOD("blit_rect_mask", "src", "mask", "src_rect", "dst"), &Image::blit_rect_mask);
@ -2379,6 +2380,47 @@ void Image::normalmap_to_xy() {
convert(Image::FORMAT_LA8);
}
void Image::bumpmap_to_normalmap(float bump_scale) {
ERR_FAIL_COND(!_can_modify(format));
convert(Image::FORMAT_RF);
PoolVector<uint8_t> result_image; //rgba output
result_image.resize(width * height* 4);
{
PoolVector<uint8_t>::Read rp = data.read();
PoolVector<uint8_t>::Write wp = result_image.write();
unsigned char *write_ptr = wp.ptr();
float *read_ptr = (float*) rp.ptr();
for (int ty = 0; ty < height; ty++) {
int py = ty+1;
if (py >= height) py-=height;
for (int tx = 0; tx < width; tx++) {
int px=tx+1;
if (px >= width) px-=width;
float here = read_ptr[ty*width + tx];
float to_right= read_ptr[ty*width + px];
float above= read_ptr[py*width + tx];
Vector3 up = Vector3(0,1,(here-above)*bump_scale);
Vector3 across = Vector3(1,0,(to_right-here)*bump_scale);
Vector3 normal = across.cross(up);
normal.normalize();
write_ptr[ ((ty*width + tx) <<2) +0 ]= (128.0 + normal.x * 127.0);
write_ptr[ ((ty*width + tx) <<2) +1 ]= (128.0 + normal.y * 127.0);
write_ptr[ ((ty*width + tx) <<2) +2 ]= (128.0 + normal.z * 127.0);
write_ptr[ ((ty*width + tx) <<2) +3 ]= 255;
}
}
}
format=FORMAT_RGBA8;
data=result_image;
}
void Image::srgb_to_linear() {
if (data.size() == 0)

1
core/image.h
View file

@ -284,6 +284,7 @@ public:
void premultiply_alpha();
void srgb_to_linear();
void normalmap_to_xy();
void bumpmap_to_normalmap(float bump_scale=1.0);
void blit_rect(const Ref<Image> &p_src, const Rect2 &p_src_rect, const Point2 &p_dest);
void blit_rect_mask(const Ref<Image> &p_src, const Ref<Image> &p_mask, const Rect2 &p_src_rect, const Point2 &p_dest);