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Merge pull request #49421 from floppyhammer/fix-vram-compressed-mipmaps

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Fix mipmaps of VRAM compressed textures
This commit is contained in:
Juan Linietsky 2021-06-11 12:35:00 -03:00 committed by GitHub
commit fbb5a541ef
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 23 additions and 12 deletions
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35
core/io/image.cpp
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@ -1428,16 +1428,23 @@ void Image::flip_x() {
}
}
/// Get mipmap size and offset.
int Image::_get_dst_image_size(int p_width, int p_height, Format p_format, int &r_mipmaps, int p_mipmaps, int *r_mm_width, int *r_mm_height) {
// Data offset in mipmaps (including the original texture).
int size = 0;
int w = p_width;
int h = p_height;
// Current mipmap index in the loop below. p_mipmaps is the target mipmap index.
// In this function, mipmap 0 represents the first mipmap instead of the original texture.
int mm = 0;
int pixsize = get_format_pixel_size(p_format);
int pixshift = get_format_pixel_rshift(p_format);
int block = get_format_block_size(p_format);
//technically, you can still compress up to 1 px no matter the format, so commenting this
// Technically, you can still compress up to 1 px no matter the format, so commenting this.
//int minw, minh;
//get_format_min_pixel_size(p_format, minw, minh);
int minw = 1, minh = 1;
@ -1453,17 +1460,6 @@ int Image::_get_dst_image_size(int p_width, int p_height, Format p_format, int &
size += s;
if (r_mm_width) {
*r_mm_width = bw;
}
if (r_mm_height) {
*r_mm_height = bh;
}
if (p_mipmaps >= 0 && mm == p_mipmaps) {
break;
}
if (p_mipmaps >= 0) {
w = MAX(minw, w >> 1);
h = MAX(minh, h >> 1);
@ -1474,6 +1470,21 @@ int Image::_get_dst_image_size(int p_width, int p_height, Format p_format, int &
w = MAX(minw, w >> 1);
h = MAX(minh, h >> 1);
}
// Set mipmap size.
// It might be necessary to put this after the minimum mipmap size check because of the possible occurrence of "1 >> 1".
if (r_mm_width) {
*r_mm_width = bw >> 1;
}
if (r_mm_height) {
*r_mm_height = bh >> 1;
}
// Reach target mipmap.
if (p_mipmaps >= 0 && mm == p_mipmaps) {
break;
}
mm++;
}