diff options
| -rw-r--r-- | core/image.cpp | 42 | ||||
| -rw-r--r-- | core/image.h | 1 |
2 files changed, 43 insertions, 0 deletions
diff --git a/core/image.cpp b/core/image.cpp index 790f17a9d6..2ac8ffea56 100644 --- a/core/image.cpp +++ b/core/image.cpp @@ -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) diff --git a/core/image.h b/core/image.h index e962787ae9..17477d88ea 100644 --- a/core/image.h +++ b/core/image.h @@ -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); |