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| Amrazek |
Posted - Mar 24 2003 : 6:21:47 PM
Don't go and explode on me! I'm perfectly aware that DirectDraw doesn't support lighting... Natively. I want to write my own functions to do it for me, using GetLockedArray() and modifying the memory.
However, before I continue with what I already have, I'd like to get assured on a few things:
1) The longs in the array returned from GetLockedArray() are NOT normal colors, and I have to somehow convert them.
2) The array from GetLockedArray() will have the same dimensions as the screen, right?
3) Some of the lighting code from www.Directx4vb.com will work, with slight modification.
4) I CANNOT make DLL calls while I have a surface locked, correct?
Thanks!
-Amrazek |
| Amrazek |
Posted - Jun 19 2003 : 1:09:23 PM
According to the DirectX7 SDK, the long argument in the ColorGet functions is supposed to be between 0 and 255...
color
Color from which the red component is retrieved. A value between 0 and 255.
? |
| Amrazek |
Posted - Jun 15 2003 : 12:11:18 PM
I downloaded the source code to the Dx/DD fullscreen tutorial and tried this out, and got the same results, so it's probably not the initialization... |
| Amrazek |
Posted - Jun 15 2003 : 12:51:58 AM
Hmm... Interesting... I'll post the portion of GfxEngine that contains that:
Public Function GetColorRed(lngDXColor As Long) As Single
GetColorRed = DX.ColorGetRed(lngDXColor)
End Function
Public Function GetColorGreen(lngDXColor As Long) As Single
GetColorGreen = DX.ColorGetGreen(lngDXColor)
End Function
Public Function GetColorBlue(lngDXColor As Long) As Single
GetColorBlue = DX.ColorGetBlue(lngDXColor)
End Function
That looks alright to me... Perhaps something in the initialize sub is wrong?
Private Sub DDInit(ByRef myForm As Long, ByRef iScreenWidth As Integer, ByRef _
iScreenHeight As Integer, ByRef iBPP As Integer, ByRef _
iColorKey As Integer, ByRef bUseVideoMemory As Boolean, _
ByRef bytFontRed As Byte, ByRef bytFontGreen As Byte, _
ByRef bytFontBlue As Byte, ByRef bSetFontTransparent As _
Boolean, ByRef iBackBufferCount As Integer, ByRef _
bGammaController As Boolean, ByRef bytGammaRed As Byte, _
ByRef bytGammaGreen As Byte, ByRef bytGammaBlue As Byte)
On Error Resume Next
Set DX = New DirectX7
Set DD = DX.DirectDrawCreate("")
Call DD.SetCooperativeLevel(myForm, DDSCL_FULLSCREEN Or DDSCL_ALLOWMODEX Or DDSCL_EXCLUSIVE)
DD.SetDisplayMode iScreenWidth, iScreenHeight, iBPP, 0, DDSDM_DEFAULT
Ddsd1.lFlags = DDSD_CAPS Or DDSD_BACKBUFFERCOUNT
If Not bSetFontTransparent = True Then
Ddsd1.ddsCaps.lCaps = DDSCAPS_PRIMARYSURFACE Or DDSCAPS_FLIP Or DDSCAPS_COMPLEX Or DDSCAPS_SYSTEMMEMORY
Else
Ddsd1.ddsCaps.lCaps = DDSCAPS_PRIMARYSURFACE Or DDSCAPS_FLIP Or DDSCAPS_COMPLEX
End If
Ddsd1.ddsCaps.lCaps = DDSCAPS_PRIMARYSURFACE Or DDSCAPS_3DDEVICE Or DDSCAPS_FLIP Or DDSCAPS_COMPLEX Or DDSCAPS_VIDEOMEMORY
Ddsd1.lBackBufferCount = iBackBufferCount
Set ddsFront = DD.CreateSurface(Ddsd1)
InitializeLighting
If bGammaController Then
Set GammaController = ddsFront.GetDirectDrawGammaControl
GammaController.GetGammaRamp DDSGR_DEFAULT, OriginalRamp
End If
Dim Caps As DDSCAPS2
If Not bUseVideoMemory = True Then
Caps.lCaps = DDSCAPS_BACKBUFFER Or DDSCAPS_SYSTEMMEMORY
Else
Caps.lCaps = DDSCAPS_BACKBUFFER
End If
Set ddsBack = ddsFront.GetAttachedSurface(Caps)
ddsBack.GetSurfaceDesc Ddsd2
Set D3D = DD.GetDirect3D
Set DEV = D3D.CreateDevice("IID_IDirect3DHALDevice", ddsBack)
DDSetFont "Calligraphic 421 BT", 12, RGB(bytFontRed, bytFontGreen, bytFontBlue)
If bSetFontTransparent Then
ddsBack.SetFontTransparency True
End If
With Screen
.nWidth = iScreenWidth
.nHeight = iScreenHeight
.nBPP = iBPP
.bytFontRed = bytFontRed
.bytFontGreen = bytFontGreen
.bytFontBlue = bytFontBlue
.bFontTransparent = bSetFontTransparent
.iColorKey = iColorKey
.bUseVideoMemory = bUseVideoMemory
.iBackBufferCount = iBackBufferCount
.bGammaController = bGammaController
.bytGammaRed = bytGammaRed
.bytGammaGreen = bytGammaGreen
.bytGammaBlue = bytGammaBlue
End With
If bGammaController Then
SetGamma bytGammaRed, bytGammaGreen, bytGammaBlue
End If
Also of note: I'm using 2 backbuffers, and am using the gamma controller. BPP = 16, and the ColorKey is black. Another thing: GfxEngine is actually a whole DirectDraw engine I wrote, and is a DLL.
This is more difficult than I initially thought...  Oh well, much knowledge to be gained.
-Amrazek |
| Eric Coleman |
Posted - Jun 15 2003 : 12:16:08 AM
Did you write the "GetColor" functions in the GfxEngine class? A value of "h31" should translate to value of "1.0" in 16 bit color. |
| Amrazek |
Posted - Jun 14 2003 : 2:23:23 PM
The pixel format is beginning to make sense. I was using this:
Dim pBytes(0 To 1) As Byte
pBytes(0) = BytMem(0 * 2, 0)
pBytes(1) = BytMem(0 * 2 + 1, 0)
CopyMemory pDest, pBytes(0), 2
Debug.Print "Output:"
Debug.Print " Returned: "; CStr(pDest)
Debug.Print " Hex: "; Hex(pDest)
Debug.Print " Byte1: "; CStr(pBytes(0))
Debug.Print " Byte2: "; CStr(pBytes(1))
Debug.Print " retR: "; GfxEngine.GetColorRed(pDest)
Debug.Print " retG: "; GfxEngine.GetColorGreen(pDest)
Debug.Print " retB: "; GfxEngine.GetColorBlue(pDest)
I made a solid blue rectangle on the screen and tried various things with it. The results that were outputted were:
Output:
Returned: 31
Hex: 1F
Byte1: 31
Byte2: 0
retR: 0
retG: 0
retB: 0.1215686
I see that the blue channel is at least returning something, but I don't know what it means... I have no idea of what format retB is in.
-Amrazek |
| Eric Coleman |
Posted - Jun 07 2003 : 12:30:19 PM
Try using some solid color surfaces first to help you get a better idea of how the bytes are laid out in the byte array. You could try an all blue surface, and then output a few bytes in HEX, then you could easily combine them with the windows Calculator to see how things are organized. For example, if you use Debug.print to get something like this... 0 1F 0 1F, you would use the number "001F001F" in Calculator to convert to a binary of "0000 0001 1111 0000 0000 0001 1111", and that would show you the color is only using 6 Bits. If you explore a bit more, you'll understand how things are packed together. |
| Amrazek |
Posted - Jun 06 2003 : 10:47:13 PM
I believe I understand now -- didn't know that it was only 2 bytes and that you could use CopyMemory to combine them. That helps a lot =)
However, the value returned is still incorrect... Perhaps I need to do some kind of a conversion on it? |
| Eric Coleman |
Posted - Jun 04 2003 : 9:55:51 PM
.GetColorRed/Green/Blue expects a LONG, the data from the byte array is a BYTE. If you are in 16bit mode, two bytes make a color for each pixel, in 24bit mode, then its 3 bytes to a pixel, and in 32 bit mode, its 4 bytes to a pixel.
A 32bit example would look something like this after you use GetLockedArray
Dim B(0 to 3) as Byte, L as Long
B(0)= LckdArray(0+0,0)
B(1)= LckdArray(0+1,0)
B(2)= LckdArray(0+2,0)
B(3)= LckdArray(0+3,0)
CopyMemory(L, B(0), 4) Debug.Print dx.ColorGetRed(L)
Debug.Print dx.ColorGetGreen(L)
Debug.Print dx.ColorGetBlue(L)
A 16bit example would be only two bytes to the byte array, B(0 to 1), and then copymemory would be CopyMemory(L, B(0)), 2).
Of course, there are faster ways to do this. I'm just trying to show you how the bytes are arranged. The pixel at location (0,0) would be LckdArray(0,0), LckdArray(1,0), LckdArray(2,0), LckdArray(3,0), the pixel at location (1,0) would be LckdArray(4,0), LckdArray(5,0), LckdArray(6,0), LckdArray(7,0). |
| Amrazek |
Posted - Jun 04 2003 : 9:26:57 PM
My hopeful idea didn't work... I was thinking that .GetLockedArray returned the width of the surface * 3, for BGR... However, .ColorGetRed/Green/Blue didn't work... Red returned 1, the others returned 0. Frustrating  |
| Amrazek |
Posted - Jun 04 2003 : 6:16:12 PM
I've got the changing my RGB color into a DXRGB color conversion working. However, I cannot change a DXRGB color back into RGB... I've tried .ColorGetRed / Blue / Green, but that requires a value of 0-255. As I understand it, the values in GetLockedArray ARE up to 255, but it's in a different format... There are 3 bytes per pixel... Unless... Just maybe... I've got an idea. I'll have to go check it out right now.
-Amrazek |
| Eric Coleman |
Posted - Jun 04 2003 : 09:41:41 AM
Look at that link I provided in my last message. For GetLockedArray(), I think you are supposed to use an array of Bytes. |
| Amrazek |
Posted - Jun 03 2003 : 9:47:54 PM
I'm having difficulty returning the color of a pixel... I just can't seem to figure out how to change the DirectDraw long value back into RGB... |
| Amrazek |
Posted - May 30 2003 : 3:18:16 PM
I put this project off a little bit, for lack of understanding, but my interest has been rekindled. So far, I've got the code to set the correct color implemented and working, but the second part is returning a color back to its original state. I've lost the source for this project, but I had added a few capabilites to my general game engine that will allow me to rebuild it in about a half hour. I've got a couple theories going; I'll add a reply on anything that I've found.
-Amrazek |
| Eric Coleman |
Posted - Apr 14 2003 : 4:08:09 PM
check out the discussion about color here
To sum it all up, you need to find the color masks for your surface, and then use those to extract the data returned from GetLockedArray. If you have the individual R,G,B color components, then you can decrease each one individualy, or if you want to be really accurate, you could convert the RGB color to a different color space and change the luminance or brightness.
This is what YCC conversion would look like using RGB values 0 to 255,
Y = 0.299 * R + 0.587 * G + 0.114 * B
Cb = -0.1687 * R - 0.3313 * G + 0.5 * B + 128
Cr = 0.5 * R - 0.4187 * G - 0.0813 * B + 128
Y = Y * 0.9
R = Y + 1.402 * (Cr - 128)
G = Y - 0.34414 * (Cb - 128) - 0.71414 * (Cr - 128)
B = Y + 1.772 * (Cb - 128)
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| Amrazek |
Posted - Apr 13 2003 : 10:38:22 AM
I feel like I've run into a brick wall. I'm using GetLockedArray() to get a pointer to the [backbuffer's] surface memory, and so far all that works. Changes are reflected in the surface, as they should be.
The problem is that I cannot obtain the 'true' color of a pixel, nor specify my own color. This is because I cannot determine the RGB of the pixel -- it's in a format that I don't know how to change. How can I convert the raw data into a usable RGB format?
Mind as well hit two birds with one stone... Is there a 'darkening' formula I can use? Just changing the RGB of a pixel to a lower value doesn't darken it; it changes the color completely.
Thanks!
Amrazek |
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| VBGamer |
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