5 replies to this topic

[Nick]

Hi all,

Could someone with an ATI graphics card test which Direct3D surface formats support sRGB reading and writing?

#include <stdio.h>

#include <d3d9.h>


int main()

{

    IDirect3D9 *d3d9 = Direct3DCreate9(D3D_SDK_VERSION);

    printf("Read sRGB:\n");

    for(int format = 0; format < 1000; format++)

        if(d3d9->CheckDeviceFormat(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, D3DFMT_X8R8G8B8, D3DUSAGE_QUERY_SRGBREAD, D3DRTYPE_TEXTURE, (D3DFORMAT)format) == D3D_OK)

            printf("\t%d\n", format);

    printf("Write sRGB:\n");

    for(int format = 0; format < 1000; format++)

        if(d3d9->CheckDeviceFormat(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, D3DFMT_X8R8G8B8, D3DUSAGE_QUERY_SRGBWRITE, D3DRTYPE_TEXTURE, (D3DFORMAT)format) == D3D_OK)

            printf("\t%d\n", format);

}

Thanks!

Nicolas

[Vilem Otte]

It returns 21, 22 and 33 for both writing sRGB and reading sRGB.
Tested on Radeon HD 2900 XT, 6GB RAM, Pentium D 2*2.8 Ghz, Windows XP Professional

[Nick]

Thanks a lot Vilém!

[roel]

Do you need information for other ATI cards too, Nick?

[Nick]

roel said:

Do you need information for other ATI cards too, Nick?

No, I was just trying to confirm the cause of a bug. NVIDIA cards also support sRGB for 16-bit surfaces, so you have to be careful no to do gamma correction in the shader as well...

But if you have some time to kill you're always welcome to post more results of course. I assume they support sRGB for DXTn and ATIn formats, but maybe that assumption will cause my next bug. ;)

[Kenneth Gorking]

Ran it on my Radeon Mobility 9700

Read sRGB:
21
22
26
50
51
Write sRGB:
21
22
26