Hello,
the procedure wglGetGPUInfoAMD will always fail if no call was made to wglGetGPUIDsAMD.
example:
// retrieve the id of the device from the current context
gpuId = wglGetContextGPUIDAMD(currentContext);
// retrieve the amount of ram
UINT gpuMem = 0;
wglGetGPUInfoAMD(gpuId, WGL_GPU_RAM_AMD, GL_UNSIGNED_INT, sizeof(UINT), &gpuMem); // return -1
the above code will alway fail. you must add a call to wglGetGPUIDsAMD
this code will work:
// non sense call
wglGetGPUIDsAMD(0, 0);
// retrieve the id of the device from the current context
gpuId = wglGetContextGPUIDAMD(currentContext);
// retrieve the amount of ram
UINT gpuMem = 0;
wglGetGPUInfoAMD(gpuId, WGL_GPU_RAM_AMD, GL_UNSIGNED_INT, sizeof(UINT), &gpuMem);
is wglGetGPUIDsAMD do any kind of initializations that wglGetContextGPUIDAMD does not ? the spec file has no words about it.
my specs:
windows seven x64 (same behavior apply on 32 bits)
ati radeon hd 5770
catalyst 12.6
thanks.
