This works fine for me:
// Project: golelorn
// Created: 2017-08-16
// show all errors
SetErrorMode(2)
// set window properties
SetWindowTitle( "golorn" )
SetWindowAllowResize( 1 ) // allow the user to resize the window
// set display properties
SetVirtualResolution( 1024, 768 ) // doesn't have to match the window
SetOrientationAllowed( 1, 1, 1, 1 ) // allow both portrait and landscape on mobile devices
SetSyncRate( 60, 0 ) // 30fps instead of 60 to save battery
SetScissor( 0,0,0,0 ) // use the maximum available screen space, no black borders
UseNewDefaultFonts( 1 ) // since version 2.0.22 we can use nicer default fonts
SetGenerateMipmaps(1)
SetAntialiasMode(1)
global FloorID,WallID as Integer
global dng_floor_texture,dng_wall_texture,d_floor_nrm,d_nrm_wall as Integer
WallID=LoadObject("/media/dng_wall.obj")
floorID=LoadObject("/media/dng_ground.obj")
dng_floor_texture = LoadImage( "/media/floor_1_color.png" )
dng_wall_texture = LoadImage( "/media/brick_2_color.png" )
d_floor_nrm = LoadImage( "/media/floor_1_nrm.png" )
d_nrm_wall = LoadImage( "/media/brick_2_nrm.png" )
SetImageWrapU( dng_floor_texture, 1 )
SetImageWrapV( dng_floor_texture, 1 )
SetImageWrapU( dng_wall_texture, 1 )
SetImageWrapV( dng_wall_texture, 1 )
SetImageWrapU( d_nrm_wall, 1 )
SetImageWrapV( d_nrm_wall, 1 )
SetImageWrapU( d_floor_nrm, 1 )
SetImageWrapV( d_floor_nrm, 1 )
SetObjectImage( WallID, dng_wall_texture, 0 )
SetObjectImage( floorID, dng_floor_texture, 0 )
SetObjectNormalMap( wallID, d_nrm_wall )
SetObjectNormalMap( floorID, d_floor_nrm )
w = random2(3,4)*2
h = random2(3,4)*2
SetObjectUVScale( floorID, 0, w/1.3, h/1.3 )
SetObjectScale( floorID, w, 1, h )
SetObjectPosition( wallID, 0, 0, 0+h)
SetObjectScale( wallID, w, 1, 1 )
SetObjectUVScale( wallID, 0, w,1)
//SetObjectUVScale( wallID, 2, w,1.0)
SetObjectRotation( wallID, 0, 180.0, 0 )
SetCameraPosition(1,0,5,-10)
do
SetCameraPosition(1,GetCameraX(1),GetCameraY(1),GetCameraZ(1)+0.005)
Print( ScreenFPS() )
Sync()
loop
I can only imagine you didn't set mipmaps on before you loaded the images?
I also switched on AA so you can see any difference with/without that.