I have troubles understanding how to read data from a locked texture. What im trying todo is to parse through an image of b/w texels to retrieve some informations. For testing that i created a 3x1 bmp file containing 2 black and 1 white (b,b,w) texel.(RGB, 8bit channels, 24bit depth)
So what i'm doing here is to create a texture out of that file and lock it. For my tests i directly access the pBits area of the locked rect. Yet they are not as expected.
As far as i know each texel will be represented by 4 bytes (b,g,r,a) on the locked memory area.
By that I would have expected a result like this:
First two black:
pbits[0] = 0
pbits[1] = 0
pbits[2] = 0
pbits[3] = 255
pbits[4] = 0
pbits[5] = 0
pbits[6] = 0
pbits[7] = 255
Last white:
pbits[8] = 255
pbits[9] = 255
pbits[10] = 255
pbits[11] = 255
Yet i receive something like this:
pbits[0] = 43
pbits[1] = 43
pbits[2] = 43
pbits[3] = 0
pbits[4] = 0
pbits[5] = 0
pbits[6] = 0
pbits[7] = 0
pbits[8] = 96
pbits[9] = 96
pbits[10] = 96
pbits[11] = 0
When i have only two pixel using black and white it does work however. Can someone help me finding out what i'm doing wrong here ? The pitch should not be important here as i only test the first 3 pixels, right ?!
Here a code snipped without all the checking stuff around:
IDirect3DTexture9* tex;
D3DXCreateTextureFromFile(g_device, "pixelTest.bmp", &tex);
D3DLOCKED_RECT lRect;
ZeroMemory(&lRect, sizeof(D3DLOCKED_RECT));
tex->LockRect(0, &lRect, NULL, NULL);
int iPitch = lRect.Pitch;
BYTE* pPBits = static_cast<BYTE*>(lRect.pBits);
Any help would be highly appreciated - this thing costs me some hours already
Thanks alot,
Oliver
