BGRA only? No difference b/w PixelFomats? RGB BGR RGBA

I proves to be that no matter which Pixel Format I use they all behave like PF_BYTE_BGRA only.

pointer = pixelBuffer.lock(0,width*height,ogre.HardwareBuffer.HBL_NORMAL)
#number 4 here is use to accommodate the bytes for r, g, b, a may vary with different pixel formats
storageclass = ctypes.c_uint8 * (width*height*4)
cbuffer=storageclass.from_address(ogre.CastInt(pointer))
pos = 0
for x in range(height*width):
cbuffer[pos] = dataArray[x][2]
pos += 1
cbuffer[pos] = dataArray[x][1]
pos += 1
cbuffer[pos] = dataArray[x][0]
pos += 1
cbuffer[pos] = 1
pos += 1

Surprisingly no matter which BYTE* pixel format I use they all give me the same result as PF_BYTE_BGRA. Even using PF_BYTE_RGBA does not swap Red and Blue.


However if I use 3 pixels and skip alpha copying. The image results in this. So it only works right if I assume the pixel format is BGRA.


Is there any problem with binding problem pixel formats enums.

Can you post the code that deals with the pixel format enum? Also did you take a look at the demo which does the pixel format manipulation?

DOES NOT MATTER which PF_BYTE* I use, the final result is always ogre.PF_BYTE_BGRA. The code is based on a post in this form. That post uses PF_BYTE_BGRA too.


def make_tex(self):
## Test pixel stuff..
# Create the texture
texture = ogre.TextureManager.getSingleton().createManual(
"DynamicTexture", # name
ogre.ResourceGroupManager.DEFAULT_RESOURCE_GROUP_NAME,
ogre.TEX_TYPE_2D, # type
256, 256, # width & height
0, # number of mipmaps
# DOES NOT MATTER which PF_BYTE* I use, the result is
# always ogre.PF_BYTE_BGRA
ogre.PF_BYTE_RGB, # pixel format
ogre.TU_DEFAULT) # usage; should be TU_DYNAMIC_WRITE_ONLY_DISCARDABLE for
# textures updated very often (e.g. each frame)



# Create a material using the texture
material = ogre.MaterialManager.getSingleton().create(
"MatTV", # name
ogre.ResourceGroupManager.DEFAULT_RESOURCE_GROUP_NAME)

material.getTechnique(0).getPass(0).createTextureUnitState("DynamicTexture")
return (material, texture)

Are you sure your card supports the other Pixel Formats?. For me I have the same problem with my card for both C++ and python ogre as:
http://www.ogre3d.org/phpBB2/viewtopic. ... =pfbytergb

No need to shout. I was just trying to remove sources of error. I know there are some demos/samples that manipulate the pixels directly. They could of been using a different pixel format, and if they worked, it would just be a simple coding error on your part. That is also my reason for asking for a more complete code sample.

I believe a complete Ogre log shows the supported pixel formats for your card. Maybe you could check that.

You guys are right my card (intel 945g dx9 compatible) doest support this format. I read a post on ogre which says pxiel formats fallbacks to next possible format incase orignal not found.


Anyhow this is what I was trying to acheive.
M.A.M.E (Arcade Emulator) and my TvTuner in PythonOgre