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How can i use ASTC in Emulator_v1.2

jooyoung jung
Note: This was originally posted on 21st May 2013 at http://forums.arm.com

Hi.


i don't know astc load.

i tryed  as follows.

step1 . PNG file compressed using Mali_Compress_tool  (  768X512 PNG file   ->  Very fast   block: 4X4 Low Dynamic Range   ) 
              Output file:    test.astc

step2.  Using glCompressedTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGBA_ASTC_4x4_KHR, 768, 512, 0, astc_size, imageData)
                        [size=2]GL_CHECK(glTexParameteri(target, GL_TEXTURE_WRAP_S,     GL_CLAMP_TO_EDGE));[/size]
   GL_CHECK(glTexParameteri(target, GL_TEXTURE_WRAP_T,     GL_CLAMP_TO_EDGE));
   GL_CHECK(glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
   GL_CHECK(glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR));

astc_size :  file size
                FILE *f = fopen(filename, "rb");

  fseek(f, 0L, SEEK_END);
  astc_size = ftell(f);
  fseek(f, 0L, SEEK_SET);
[size=2]
[/size]
[size=2]imageData[/size][size=2]    :  [/size]

   [size=2]imageData[/size][size=2]    [/size]= (unsigned char*) malloc(size);
  fread([size=2]imageData[/size][size=2]    [/size], astc_size , 1, f);


error occurs in the [size=2]glCompressedTexImage2D[/size]
[size=2]
[/size]
[size=2]How can i load ASTC file?[/size]
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  • Note: This was originally posted on 24th June 2013 at http://forums.arm.com

    Jooyong, did you get this working?

    The code as you present it does not take account of the header at the front of the ASTC file, which is 16 bytes in length. It is constructed as follows:

    Bytes 0..3 are the magic header value 0x5CA1AB13
    Byte 4 is the X block dimension
    Byte 5 is the Y block dimension
    Byte 6 is the Z block dimension
    Bytes 7..9 are the X image size (this is a 24-bit value, measured in pixels)
    Bytes 10..12 are the Y image size
    Bytes 13..15 are the Z image size (which will be 1 for a 2D image)

    All multi-byte values are little-endian.

    Immediately following the header is the actual image data, which is of size (ftell(f)-16) bytes. This is the data that should be passed to glCompressedTexImage2D.
Reply
  • Note: This was originally posted on 24th June 2013 at http://forums.arm.com

    Jooyong, did you get this working?

    The code as you present it does not take account of the header at the front of the ASTC file, which is 16 bytes in length. It is constructed as follows:

    Bytes 0..3 are the magic header value 0x5CA1AB13
    Byte 4 is the X block dimension
    Byte 5 is the Y block dimension
    Byte 6 is the Z block dimension
    Bytes 7..9 are the X image size (this is a 24-bit value, measured in pixels)
    Bytes 10..12 are the Y image size
    Bytes 13..15 are the Z image size (which will be 1 for a 2D image)

    All multi-byte values are little-endian.

    Immediately following the header is the actual image data, which is of size (ftell(f)-16) bytes. This is the data that should be passed to glCompressedTexImage2D.
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