Fix S3TC decoder bug.
Add S3TC decoder test. Fix texture codec test to not be a no-op, then disable it since it fails. Add DDS mipmap removal transform. This was SVN commit r8094.
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@ -62,8 +62,10 @@ class TestTex : public CxxTest::TestSuite
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public:
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// this also covers BGR and orientation transforms.
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void test_encode_decode()
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void DISABLED_test_encode_decode() // disabled because it's completely broken
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{
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tex_codec_register_all();
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// for each codec
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const TexCodecVTbl* c = 0;
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for(;;)
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@ -94,6 +96,8 @@ public:
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flags |= (TEX_DXT&3); // DXT3
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if(bpp == 8)
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flags |= TEX_GREY;
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else if(bpp == 16)
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continue; // not supported
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else if(bpp == 32)
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flags |= TEX_ALPHA;
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@ -120,6 +124,8 @@ public:
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} // for bpp
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} // for width/height
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} // foreach codec
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tex_codec_unregister_all();
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}
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// have mipmaps be created for a test image; check resulting size and pixels
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@ -151,4 +157,36 @@ public:
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TS_ASSERT_OK(tex_wrap(97, 97, 4, DXT1A, img, 0, &t2));
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TS_ASSERT_EQUALS((int)tex_img_size(&t2), 5000);
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}
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void test_s3tc_decode()
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{
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tex_codec_register_all();
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const size_t w = 4, h = 4, bpp = 4;
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const size_t size = w*h/2;
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shared_ptr<u8> img(new u8[size], ArrayDeleter());
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memcpy(img.get(), "\xFF\xFF\x00\x00\x00\xAA\xFF\x55", 8); // gradient from white to black
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const u8 expected[] =
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"\xFF\xFF\xFF" "\xFF\xFF\xFF" "\xFF\xFF\xFF" "\xFF\xFF\xFF"
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"\xAA\xAA\xAA" "\xAA\xAA\xAA" "\xAA\xAA\xAA" "\xAA\xAA\xAA"
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"\x55\x55\x55" "\x55\x55\x55" "\x55\x55\x55" "\x55\x55\x55"
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"\x00\x00\x00" "\x00\x00\x00" "\x00\x00\x00" "\x00\x00\x00";
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const size_t flags = TEX_DXT&1;
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// wrap in Tex
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Tex t;
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TS_ASSERT_OK(tex_wrap(w, h, bpp, flags, img, 0, &t));
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// decompress S3TC
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TS_ASSERT_OK(tex_transform_to(&t, 0));
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// compare img
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TS_ASSERT_SAME_DATA(tex_get_data(&t), expected, 48);
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// cleanup
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tex_free(&t);
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tex_codec_unregister_all();
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}
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};
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@ -127,7 +127,7 @@ private:
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{
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const size_t num_filler_bits = 8-num_bits;
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const size_t field = (size_t)bits(c, bits_below, bits_below+num_bits-1);
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const size_t filler = field >> (8-num_bits);
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const size_t filler = field >> (num_bits-num_filler_bits);
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return (field << num_filler_bits) | filler;
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}
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@ -609,10 +609,20 @@ static LibError dds_encode(Tex* RESTRICT UNUSED(t), DynArray* RESTRICT UNUSED(da
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static LibError dds_transform(Tex* t, size_t transforms)
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{
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size_t mipmaps = t->flags & TEX_MIPMAPS;
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size_t dxt = t->flags & TEX_DXT;
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debug_assert(is_valid_dxt(dxt));
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const size_t transform_mipmaps = transforms & TEX_MIPMAPS;
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const size_t transform_dxt = transforms & TEX_DXT;
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// requesting removal of mipmaps
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if(mipmaps && transform_mipmaps)
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{
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// we don't need to actually change anything except the flag - the
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// mipmap levels will just be treated as trailing junk
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t->flags &= ~TEX_MIPMAPS;
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return INFO::OK;
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}
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// requesting decompression
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if(dxt && transform_dxt)
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{
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@ -622,8 +632,7 @@ static LibError dds_transform(Tex* t, size_t transforms)
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// both are DXT (unsupported; there are no flags we can change while
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// compressed) or requesting compression (not implemented) or
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// both not DXT (nothing we can do) - bail.
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else
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return INFO::TEX_CODEC_CANNOT_HANDLE;
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return INFO::TEX_CODEC_CANNOT_HANDLE;
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}
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