Method copyToBmp

Engine/source/gfx/gl/gfxGLTextureObject.cpp:153–210

}

bool GFXGLTextureObject::copyToBmp(GBitmap * bmp)
{
   if (!bmp)
      return false;

   // check format limitations
   // at the moment we only support RGBA for the source (other 4 byte formats should
   // be easy to add though)
   AssertFatal(mFormat == GFXFormatR16G16B16A16F || mFormat == GFXFormatR8G8B8A8 || mFormat == GFXFormatR8G8B8A8_LINEAR_FORCE || mFormat == GFXFormatR8G8B8A8_SRGB, "copyToBmp: invalid format");
   if (mFormat != GFXFormatR16G16B16A16F && mFormat != GFXFormatR8G8B8A8 && mFormat != GFXFormatR8G8B8A8_LINEAR_FORCE && mFormat != GFXFormatR8G8B8A8_SRGB)
	   return false;

   AssertFatal(bmp->getWidth() == getWidth(), avar("GFXGLTextureObject::copyToBmp - Width mismatch: %i vs %i", bmp->getWidth(), getWidth()));
   AssertFatal(bmp->getHeight() == getHeight(), avar("GFXGLTextureObject::copyToBmp - Height mismatch: %i vs %i", bmp->getHeight(), getHeight()));

   PROFILE_SCOPE(GFXGLTextureObject_copyToBmp);

   PRESERVE_TEXTURE(mBinding);
   glBindTexture(mBinding, mHandle);

   U8 dstBytesPerPixel = GFXFormat_getByteSize( bmp->getFormat() );
   U8 srcBytesPerPixel = GFXFormat_getByteSize( mFormat );

   FrameAllocatorMarker mem;
   

   U32 mipLevels = getMipLevels();
   for (U32 mip = 0; mip < mipLevels; mip++)
   {
      U32 srcPixelCount = bmp->getSurfaceSize(mip)/ srcBytesPerPixel;

      U8* dest = bmp->getWritableBits(mip);
      U8* orig = (U8*)mem.alloc(srcPixelCount * srcBytesPerPixel);

      glGetTexImage(mBinding, mip, GFXGLTextureFormat[mFormat], GFXGLTextureType[mFormat], orig);
      if (mFormat == GFXFormatR16G16B16A16F)
      {
         dMemcpy(dest, orig, srcPixelCount * srcBytesPerPixel);
      }
      else
      {
         for (int i = 0; i < srcPixelCount; ++i)
         {
            dest[0] = orig[0];
            dest[1] = orig[1];
            dest[2] = orig[2];
            if (dstBytesPerPixel == 4)
               dest[3] = orig[3];

            orig += srcBytesPerPixel;
            dest += dstBytesPerPixel;
         }
      }
   }
   glBindTexture(mBinding, NULL);

   return true;
}