Error out if depth textures have more than one level.
Error out if depth textures have more than one level.

Trac #20959
Signed-off-by: Nicolas Capens

git-svn-id: a070b70d2b8c44c266a3870c0cddd9a0ee470458@1135 736b8ea6-26fd-11df-bfd4-992fa37f6226

jgcaaprom/android_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle_dx11,mrobinson/rust-angle,ehsan/angle,KTXSoftware/angleproject,nandhanurrevanth/angle,MSOpenTech/angle-win8.0,ecoal95/angle,MIPS/external-chromium_org-third_party-angle_dx11,mrobinson/rust-angle,KTXSoftware/angleproject,vvuk/angle-old,ghostoy/angle,pombreda/angleproject,pombreda/angleproject,geekboxzone/lollipop_external_chromium_org_third_party_angle,shairai/angleproject,nandhanurrevanth/angle,csa7mdm/angle,xuxiandi/angleproject,MIPS/external-chromium_org-third_party-angle,KalebDark/angleproject,android-ia/platform_external_chromium_org_third_party_angle_dx11,jgcaaprom/android_external_chromium_org_third_party_angle,xin3liang/platform_external_chromium_org_third_party_angle_dx11,RepublicMaster/angleproject,xin3liang/platform_external_chromium_org_third_party_angle,themusicgod1/angleproject,mrobinson/rust-angle,mlfarrell/angle,larsbergstrom/angle,KTXSoftware/angleproject,android-ia/platform_external_chromium_org_third_party_angle_dx11,mrobinson/rust-angle,mybios/angle,bsergean/angle,ppy/angle,csa7mdm/angle,xin3liang/platform_external_chromium_org_third_party_angle,crezefire/angle,domokit/waterfall,MIPS/external-chromium_org-third_party-angle_dx11,ehsan/angle,xuxiandi/angleproject,MIPS/external-chromium_org-third_party-angle_dx11,larsbergstrom/angle,ecoal95/angle,vvuk/angle,larsbergstrom/angle,shairai/angleproject,RepublicMaster/angleproject,domokit/waterfall,ecoal95/angle,xuxiandi/angleproject,ghostoy/angle,mybios/angle,crezefire/angle,android-ia/platform_external_chromium_org_third_party_angle_dx11,RepublicMaster/angleproject,shairai/angleproject,geekboxzone/lollipop_external_chromium_org_third_party_angle,MSOpenTech/angle-win8.0,android-ia/platform_external_chromium_org_third_party_angle,cantren/angleproject,cvsuser-chromium/chromium-third-party_angle_dx11,crezefire/angle,vvuk/angle,MSOpenTech/angle,ppy/angle,vvuk/angle,ghostoy/angle,csa7mdm/angle,MSOpenTech/angle,mikolalysenko/angle,android-ia/platform_external_chromium_org_third_party_angle,xuxiandi/angleproject,android-ia/platform_external_chromium_org_third_party_angle,MSOpenTech/angle-win8.0,ppy/angle,ghostoy/angle,xin3liang/platform_external_chromium_org_third_party_angle,android-ia/platform_external_chromium_org_third_party_angle_dx11,themusicgod1/angleproject,mlfarrell/angle,KTXSoftware/angleproject,cantren/angleproject,ecoal95/angle,cvsuser-chromium/chromium-third-party_angle_dx11,ecoal95/angle,cvsuser-chromium/chromium-third-party_angle_dx11,shairai/angleproject,vvuk/angle-old,themusicgod1/angleproject,vvuk/angle-old,mikolalysenko/angle,KalebDark/angleproject,ehsan/angle,xin3liang/platform_external_chromium_org_third_party_angle_dx11,cantren/angleproject,KalebDark/angleproject,mlfarrell/angle,ppy/angle,KTXSoftware/angleproject,MSOpenTech/angle-win8.0,MIPS/external-chromium_org-third_party-angle_dx11,bsergean/angle,stammen/angleproject,RepublicMaster/angleproject,crezefire/angle,vvuk/angle-old,pombreda/angleproject,bsergean/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,themusicgod1/angleproject,mybios/angle,mrobinson/rust-angle,pombreda/angleproject,xin3liang/platform_external_chromium_org_third_party_angle,stammen/angleproject,bsergean/angle,ehsan/angle,xin3liang/platform_external_chromium_org_third_party_angle_dx11,MIPS/external-chromium_org-third_party-angle,MIPS/external-chromium_org-third_party-angle,nandhanurrevanth/angle,KalebDark/angleproject,mikolalysenko/angle,csa7mdm/angle,MSOpenTech/angle,mybios/angle,cvsuser-chromium/chromium-third-party_angle_dx11,MSOpenTech/angle,geekboxzone/lollipop_external_chromium_org_third_party_angle,jgcaaprom/android_external_chromium_org_third_party_angle,nandhanurrevanth/angle,mlfarrell/angle,cantren/angleproject,android-ia/platform_external_chromium_org_third_party_angle,vvuk/angle,stammen/angleproject,stammen/angleproject,MIPS/external-chromium_org-third_party-angle,jgcaaprom/android_external_chromium_org_third_party_angle,mikolalysenko/angle,larsbergstrom/angle