Method copyResource

Engine/source/gfx/gl/gfxGLDevice.cpp:483–547

}

void GFXGLDevice::copyResource(GFXTextureObject* pDst, GFXCubemap* pSrc, const U32 face)
{
   AssertFatal(pDst, "GFXGLDevice::copyResource: Destination texture is null");
   AssertFatal(pSrc, "GFXGLDevice::copyResource: Source cubemap is null");

   GFXGLTextureObject* gGLDst = static_cast<GFXGLTextureObject*>(pDst);
   GFXGLCubemap* pGLSrc = static_cast<GFXGLCubemap*>(pSrc);

   const GFXFormat format = pGLSrc->getFormat();
   const bool isCompressed = ImageUtil::isCompressedFormat(format);
   const U32 mipLevels = pGLSrc->getMipMapLevels();
   const U32 texSize = pGLSrc->getSize();

   //set up pbo if we don't have copyImage support
   if (!GFXGL->mCapabilities.copyImage)
   {
      const GLuint pbo = gGLDst->getBuffer();
      glBindBuffer(GL_PIXEL_PACK_BUFFER, pbo);
      //allocate data
      glBufferData(GL_PIXEL_PACK_BUFFER, texSize * texSize * GFXFormat_getByteSize(format), NULL, GL_STREAM_COPY);
   }

   for (U32 mip = 0; mip < mipLevels; mip++)
   {
      const U32 mipSize =  texSize >> mip;
      if (GFXGL->mCapabilities.copyImage)
      {
         glCopyImageSubData(pGLSrc->mCubemap, GL_TEXTURE_CUBE_MAP, mip, 0, 0, face, gGLDst->getHandle(), GL_TEXTURE_2D, mip, 0, 0, 0, mipSize, mipSize, 1);
      }
      else
      {
         //pbo id
         const GLuint pbo = gGLDst->getBuffer();

         //copy source texture data to pbo
         glBindTexture(GL_TEXTURE_CUBE_MAP, pGLSrc->mCubemap);
         glBindBuffer(GL_PIXEL_PACK_BUFFER, pbo);

         if (isCompressed)
            glGetCompressedTexImage(GFXGLFaceType[face], mip, NULL);
         else
            glGetTexImage(GFXGLFaceType[face], mip, GFXGLTextureFormat[format], GFXGLTextureType[format], NULL);

         glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
         glBindTexture(GL_TEXTURE_CUBE_MAP, 0);

         //copy data from pbo to destination
         glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
         glBindTexture(gGLDst->getBinding(), gGLDst->getHandle());

         if (isCompressed)
         {
            const U32 mipDataSize = getCompressedSurfaceSize(format, pGLSrc->getSize(), pGLSrc->getSize(), 0);
            glCompressedTexSubImage2D(gGLDst->getBinding(), mip, 0, 0, mipSize, mipSize, GFXGLTextureFormat[format], mipDataSize, NULL);
         }
         else
         {
            glTexSubImage2D(gGLDst->getBinding(), mip, 0, 0, mipSize, mipSize, GFXGLTextureFormat[format], GFXGLTextureType[format], NULL);