Function random_compress_test

example/example.cpp:664–1169

The main point of this test is to exercise lots of internal code paths.

// The main point of this test is to exercise lots of internal code paths.
bool random_compress_test()
{
    printf("Random XUASTC/ASTC LDR 4x4-12x12 compression test:\n");

    const uint32_t num_images = 18;
    image test_images[num_images + 1];

    for (uint32_t i = 0; i < num_images; i++)
        load_png(fmt_string("../test_files/kodim{02}.png", 1 + i).c_str(), test_images[i]);
    
    const uint32_t N = 16;
    //const uint32_t N = 5000;
    const uint32_t MAX_WIDTH = 1024, MAX_HEIGHT = 1024;
        
    basisu::rand rnd;
    
    float lowest_psnr1 = BIG_FLOAT_VAL, lowest_psnr2 = BIG_FLOAT_VAL;

    struct result
    {
        uint32_t m_seed;
        basist::basis_tex_format m_fmt;
        float m_psnr1;
        float m_psnr2;
    };
    basisu::vector<result> results;

    for (uint32_t i = 0; i < N; i++)
    {
        uint32_t seed = 166136844 + i;

        //seed = 23082246; // etc1s 1-bit SSE overflow
        //seed = 56636601; // UASTC HDR 4x4 assert tol
        //seed = 56636744; // HDR 6x6 float overflow

        fmt_printf("------------------------------ Seed: {}\n", seed);
        rnd.seed(seed);

        const uint32_t w = rnd.irand(1, MAX_WIDTH);
        const uint32_t h = rnd.irand(1, MAX_HEIGHT);
        const bool mips = rnd.bit();
        const bool use_a = rnd.bit();
                
        fmt_printf("Trying {}x{}, mips: {}, use_a: {}\n", w, h, mips, use_a);

        // Chose a random codec/block size to test
        basist::basis_tex_format tex_mode = basist::basis_tex_format::cETC1S;

        bool is_hdr = false;

        uint32_t rnd_codec_class = rnd.irand(0, (uint32_t)codec_class::cTOTAL - 1);
        
        // TODO - make this a command line
        //rnd_codec_class = rnd.bit() ? (uint32_t)codec_class::cXUASTC_LDR : (uint32_t)codec_class::cASTC_LDR;
        //rnd_codec_class = (uint32_t)codec_class::cXUASTC_LDR;
        //rnd_codec_class = (uint32_t)codec_class::cETC1S;

        switch (rnd_codec_class)