diff options
Diffstat (limited to 'modules/etcpak/image_compress_etcpak.cpp')
| -rw-r--r-- | modules/etcpak/image_compress_etcpak.cpp | 63 |
1 files changed, 57 insertions, 6 deletions
diff --git a/modules/etcpak/image_compress_etcpak.cpp b/modules/etcpak/image_compress_etcpak.cpp index c79d449d41..274d43d437 100644 --- a/modules/etcpak/image_compress_etcpak.cpp +++ b/modules/etcpak/image_compress_etcpak.cpp @@ -132,8 +132,35 @@ void _compress_etcpak(EtcpakType p_compresstype, Image *r_img, float p_lossy_qua // Compress image data and (if required) mipmaps. const bool mipmaps = r_img->has_mipmaps(); - const int width = r_img->get_width(); - const int height = r_img->get_height(); + int width = r_img->get_width(); + int height = r_img->get_height(); + + /* + The first mipmap level of a compressed texture must be a multiple of 4. Quote from D3D11.3 spec: + + BC format surfaces are always multiples of full blocks, each block representing 4x4 pixels. + For mipmaps, the top level map is required to be a multiple of 4 size in all dimensions. + The sizes for the lower level maps are computed as they are for all mipmapped surfaces, + and thus may not be a multiple of 4, for example a top level map of 20 results in a second level + map size of 10. For these cases, there is a differing 'physical' size and a 'virtual' size. + The virtual size is that computed for each mip level without adjustment, which is 10 for the example. + The physical size is the virtual size rounded up to the next multiple of 4, which is 12 for the example, + and this represents the actual memory size. The sampling hardware will apply texture address + processing based on the virtual size (using, for example, border color if specified for accesses + beyond 10), and thus for the example case will not access the 11th and 12th row of the resource. + So for mipmap chains when an axis becomes < 4 in size, only texels 'a','b','e','f' + are used for a 2x2 map, and texel 'a' is used for 1x1. Note that this is similar to, but distinct from, + the surface pitch, which can encompass additional padding beyond the physical surface size. + */ + int next_width = (width + 3) & ~3; + int next_height = (height + 3) & ~3; + if (next_width != width || next_height != height) { + r_img->resize(next_width, next_height, Image::INTERPOLATE_LANCZOS); + width = r_img->get_width(); + height = r_img->get_height(); + } + ERR_FAIL_COND(width % 4 != 0 || height % 4 != 0); // Should be guaranteed by above + const uint8_t *src_read = r_img->get_data().ptr(); print_verbose(vformat("ETCPAK: Encoding image size %dx%d to format %s.", width, height, Image::get_format_name(target_format))); @@ -144,24 +171,48 @@ void _compress_etcpak(EtcpakType p_compresstype, Image *r_img, float p_lossy_qua uint8_t *dest_write = dest_data.ptrw(); int mip_count = mipmaps ? Image::get_image_required_mipmaps(width, height, target_format) : 0; + Vector<uint32_t> padded_src; for (int i = 0; i < mip_count + 1; i++) { // Get write mip metrics for target image. - int mip_w, mip_h; - int mip_ofs = Image::get_image_mipmap_offset_and_dimensions(width, height, target_format, i, mip_w, mip_h); + int orig_mip_w, orig_mip_h; + int mip_ofs = Image::get_image_mipmap_offset_and_dimensions(width, height, target_format, i, orig_mip_w, orig_mip_h); // Ensure that mip offset is a multiple of 8 (etcpak expects uint64_t pointer). ERR_FAIL_COND(mip_ofs % 8 != 0); uint64_t *dest_mip_write = (uint64_t *)&dest_write[mip_ofs]; // Block size. Align stride to multiple of 4 (RGBA8). - mip_w = (mip_w + 3) & ~3; - mip_h = (mip_h + 3) & ~3; + int mip_w = (orig_mip_w + 3) & ~3; + int mip_h = (orig_mip_h + 3) & ~3; const uint32_t blocks = mip_w * mip_h / 16; // Get mip data from source image for reading. int src_mip_ofs = r_img->get_mipmap_offset(i); const uint32_t *src_mip_read = (const uint32_t *)&src_read[src_mip_ofs]; + // Pad textures to nearest block by smearing. + if (mip_w != orig_mip_w || mip_h != orig_mip_h) { + padded_src.resize(mip_w * mip_h); + uint32_t *ptrw = padded_src.ptrw(); + int x = 0, y = 0; + for (y = 0; y < orig_mip_h; y++) { + for (x = 0; x < orig_mip_w; x++) { + ptrw[mip_w * y + x] = src_mip_read[orig_mip_w * y + x]; + } + // First, smear in x. + for (; x < mip_w; x++) { + ptrw[mip_w * y + x] = ptrw[mip_w * y + x - 1]; + } + } + // Then, smear in y. + for (; y < mip_h; y++) { + for (x = 0; x < mip_w; x++) { + ptrw[mip_w * y + x] = ptrw[mip_w * y + x - mip_w]; + } + } + // Override the src_mip_read pointer to our temporary Vector. + src_mip_read = padded_src.ptr(); + } if (p_compresstype == EtcpakType::ETCPAK_TYPE_ETC1) { CompressEtc1RgbDither(src_mip_read, dest_mip_write, blocks, mip_w); } else if (p_compresstype == EtcpakType::ETCPAK_TYPE_ETC2 || p_compresstype == EtcpakType::ETCPAK_TYPE_ETC2_RA_AS_RG) { |