Interpolate Texture Scrolling

[MegaMech]

Requires Kenix3/libultraship#969

This version uses floats

void scroll_texture_interpolated_save(Gfx* writableDList, const char* gfxAsset, s32 stepX, s32 stepY) {
    int8_t opcode = 0;
    if ((NULL == writableDList) || (NULL == gfxAsset)) {
        return;
    }

    Gfx* gfx = (Gfx*) gfxAsset;
    if (GameEngine_OTRSigCheck(gfx)) {
        gfx = (Gfx*) ResourceGetDataByName(gfx);
    }

    while ((opcode = GFX_GET_OPCODE(gfx->words.w0) >> 24) != G_ENDDL) {
        if (opcode == (int8_t)G_SETTILESIZE) {
            // Get values from the old tile size command
            int32_t tile = _SHIFTR(gfx->words.w1, 24, 12);
            float uls  = _SHIFTR(gfx->words.w0, 12, 12);
            float ult  = _SHIFTR(gfx->words.w0, 0,  12);
            float lrs  = _SHIFTR(gfx->words.w1, 12, 12);
            float lrt  = _SHIFTR(gfx->words.w1, 0,  12);
            
            // Write over old command to point to the new writeableDList
            __gSPDisplayList(gfx, &writableDList[0]);

            // Write DL data into writableDList. gDPScrollTexture takes up two Gfx
            gDPScrollTextureF(&writableDList[0], tile, *(uint32_t*)&uls, *(uint32_t*)&ult, *(uint32_t*)&lrs, *(uint32_t*)&lrt, stepX, stepY);
            gSPEndDisplayList(&writableDList[2]);
            break;
        }
        gfx++;
    }
}