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Merge pull request #16898 from Lerc/master 

add Image::bumpmap_to_normalmap conversion function
This commit is contained in:
Juan Linietsky 2018-04-08 15:52:05 -03:00 committed by GitHub
parent 9acc199bf8 4bea98de40
commit 59cdc5eb9d
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 43 additions and 0 deletions
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42
core/image.cpp
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@ -2239,6 +2239,7 @@ 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);
@ -2347,6 +2348,47 @@ 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] = (127.5 + normal.x * 127.5);
write_ptr[((ty * width + tx) << 2) + 1] = (127.5 + normal.y * 127.5);
write_ptr[((ty * width + tx) << 2) + 2] = (127.5 + normal.z * 127.5);
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);