D3DLOCKED_RECT lockedRect;
tempSurface->LockRect(
&lockedRect, // pointer to receive locked data
0, // lock entire surface
0); // no lock flags specified
float* dataHolder = textureInfo[j];
memset(dataHolder, 0, sizeof(float)*Pixels*Pixels*3);
// Iterate through each pixel in the surface and set it to red.
BYTE *bytePointer=(BYTE*)lockedRect.pBits;
for (DWORD y=0;y<desc.Height;y++)
{
for (DWORD x=0;x<desc.Width;x++)
{
DWORD index=(x*4+(y*(lockedRect.Pitch)));
// Blue
BYTE r=bytePointer[index];
dataHolder[y*desc.Width*3 + x*3 + 2] = (float)r;
// Green
BYTE g=bytePointer[index+1];
dataHolder[y*desc.Width*3 + x*3 + 1] = (float)g;
// Red
BYTE b=bytePointer[index+2];
dataHolder[y*desc.Width*3 + x*3 + 0] = (float)b;
// Alpha
// BYTE a=bytePointer[index+3];
}
}
tempSurface->UnlockRect();
tempSurface->Release();
Extracting values from a surface
Author
Hi
I've been able to extract colour values from a D3DFMT_A8R8G8B8 texture as there is a lot of code available that demonstrates how to do it. However, I'm having difficult extracting colour values from D3DFMT_A16B16G16R16F textures. Can anyone tell me how to do this, for D3DFMT_A8R8G8B8 textures I use the following code:
If your current D3DFMT_A8R8G8B8 code is working, it should also work fine for the D3DFMT_A16B16G16R16F format. Just use a 16 bit pointer instead of 8 bits. Be aware of the pitch value though. lockedRect.Pitch is in bytes, so you'll need to divide that by 2 if you're working with a 16-bit pointer. And that is assuming the pitch is divisible by 2.
edit: Err, umm, also, I failed to realize that the data is BGR instead of RGB. So you'll have to reverse the way you read that.
edit: Err, umm, also, I failed to realize that the data is BGR instead of RGB. So you'll have to reverse the way you read that.
Author
Hi,
If my texture is 1x1 then am I right in assuming I don't need to worry about the pitch?
If my texture is 1x1 then am I right in assuming I don't need to worry about the pitch?
Quote:If my texture is 1x1 then am I right in assuming I don't need to worry about the pitch?
Yeppers
edit: Do you mean you're getting memory exceptions with the 1x1 texture?
Author
Actually, I looked at what was happening deeper and it appears that the lock_rect method call is failing.
I tried D3DFMT_A8R8G8B8 format and getting DirectX to autogenerate all mipmaps. I have a 64x64 texture and its creating 7 levels. When I try to access any of the levels the lock_rect method always fails.
By the way, my texture is a rendertarget, is that a problem? Also, if it is then is the only way to lock and read the values of the texture to copy it to another texture that isn't a render target?
I tried D3DFMT_A8R8G8B8 format and getting DirectX to autogenerate all mipmaps. I have a 64x64 texture and its creating 7 levels. When I try to access any of the levels the lock_rect method always fails.
By the way, my texture is a rendertarget, is that a problem? Also, if it is then is the only way to lock and read the values of the texture to copy it to another texture that isn't a render target?
I haven't messed with render targets much. Have you tried enabling Direct3D-debug mode with full output? It might tell you what the problem is there.
Sorry, wish I could be more helpful.
Sorry, wish I could be more helpful.
Author
Actually, I found out you can't lock rendertargets which is sad. Thanks for the help, I appreciate it a lot!
This topic is closed to new replies.
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