diff options
| -rw-r--r-- | src/mesa/state_tracker/st_gen_mipmap.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/src/mesa/state_tracker/st_gen_mipmap.c b/src/mesa/state_tracker/st_gen_mipmap.c index 8acf6160494..701c8e54e6d 100644 --- a/src/mesa/state_tracker/st_gen_mipmap.c +++ b/src/mesa/state_tracker/st_gen_mipmap.c @@ -105,10 +105,32 @@ decompress_image(enum pipe_format format, unsigned width, unsigned height) { const struct util_format_description *desc = util_format_description(format); - const uint dst_stride = 4 * width; + const uint bw = util_format_get_blockwidth(format); + const uint bh = util_format_get_blockheight(format); + const uint dst_stride = 4 * MAX2(width, bw); const uint src_stride = util_format_get_stride(format, width); desc->unpack_rgba_8unorm(dst, dst_stride, src, src_stride, width, height); + + if (width < bw || height < bh) { + /* We're decompressing an image smaller than the compression + * block size. We don't want garbage pixel values in the region + * outside (width x height) so replicate pixels from the (width + * x height) region to fill out the (bw x bh) block size. + */ + uint x, y; + for (y = 0; y < bh; y++) { + for (x = 0; x < bw; x++) { + if (x >= width || y >= height) { + uint p = (y * bw + x) * 4; + dst[p + 0] = dst[0]; + dst[p + 1] = dst[1]; + dst[p + 2] = dst[2]; + dst[p + 3] = dst[3]; + } + } + } + } } @@ -222,7 +244,7 @@ fallback_generate_mipmap(GLcontext *ctx, GLenum target, dstWidth2); /* stride in texels */ /* compress the new image: dstTemp -> dstData */ - compress_image(format, dstTemp, dstData, dstWidth2, dstHeight2); + compress_image(format, dstTemp, dstData, dstWidth, dstHeight); free(srcTemp); free(dstTemp); |