I cannot get the PVRTexLib v4.2 to transcode to ePVRTPF_PVRTCI_2bpp_RGBA or ePVRTPF_PVRTCI_4bpp_RGBA formats but am able to do just about any other format with the exact same input and output.
I’d understand if no PVRTC was working but ePVRTPF_PVRTCII_2bpp and ePVRTPF_PVRTCII_4bpp are working without failure at all just the v1 formats.
With my code sample below is there something I’m potentially doing that isn’t supported in PVRTC v1 that is in the other formats or is it a bug in the encoder?
Any tips appreciated:
Objective-C++:
- (NSData *)encodePixelDataToPVRFileData:(NSData *)pData
height:(NSUInteger)pHeight
width:(NSUInteger)pWidth
fromPixelFormat:(NSString *)pFromPixelFormat
toPixelFormat:(NSString *)pToPixelFormat
alphaPremultiplied:(signed char)pAlphaPremultiplied
allowDithering:(signed char)pAllowDithering {
// get pixel types
PixelType inPixelType = [self _pixelTypeFromPixelFormat:pFromPixelFormat];
PixelType outPixelType = [self _pixelTypeFromPixelFormat:pToPixelFormat];
// setup data structures
CPVRTextureHeader inTextureHeader(inPixelType.PixelTypeID, (uint32_t)pHeight, (uint32_t)pWidth);
inTextureHeader.setIsPreMultiplied(pAlphaPremultiplied);
CPVRTexture texture(inTextureHeader, pData.bytes);
// encode
if(Transcode(texture, outPixelType, ePVRTVarTypeUnsignedByteNorm, ePVRTCSpacelRGB, ePVRTCBest, pAllowDithering)) {
NSMutableData *data = [NSMutableData data];
size_t fileHeaderLength = PVRTEX3_HEADERSIZE;
PVRTextureHeaderV3 fileHeader = texture.getHeader().getFileHeader();
[data appendBytes:&fileHeader length:fileHeaderLength];
size_t fileDataLength = texture.getDataSize();
void *fileData = texture.getDataPtr();
[data appendBytes:fileData length:fileDataLength];
return data;
}
return nil;
}
- (PixelType)_pixelTypeFromPixelFormat:(NSString *)pPixelFormat {
if([pPixelFormat isEqualToString:@“pvrtc2bpp”]) {
return PixelType(ePVRTPF_PVRTCI_2bpp_RGBA);
} else if([pPixelFormat isEqualToString:@“pvrtc4bpp”]) {
return PixelType(ePVRTPF_PVRTCI_4bpp_RGBA);
} else if([pPixelFormat isEqualToString:@“pvrtcii2bpp”]) {
return PixelType(ePVRTPF_PVRTCII_2bpp);
} else if([pPixelFormat isEqualToString:@“pvrtcii4bpp”]) {
return PixelType(ePVRTPF_PVRTCII_4bpp);
} else {
const char *chars = [pPixelFormat UTF8String];
uint8 pf[8];
for(NSInteger i = 0; i < pPixelFormat.length; ++i) {
switch(chars) {
case ‘r’ :
case ‘g’ :
case ‘b’ :
case ‘a’ :
pf = chars;
break;
case ‘0’ :
pf = 0;
break;
case ‘1’ :
pf = 1;
break;
case ‘2’ :
pf = 2;
break;
case ‘3’ :
pf = 3;
break;
case ‘4’ :
pf = 4;
break;
case ‘5’ :
pf = 5;
break;
case ‘6’ :
pf = 6;
break;
case ‘7’ :
pf = 7;
break;
case ‘8’ :
pf = 8;
break;
}
}
return PixelType(pf[0], pf[1], pf[2], pf[3], pf[4], pf[5], pf[6], pf[7]);
}
}
