[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=77 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=78 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=79 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=80 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=81 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=82 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=83 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=84 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=85 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=86 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=87 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=88 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=89 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=90 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=91 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[POC-TRACE] FramebufferGL::ensureAttachmentsInitialized: colorAttachments=0x1 enabledDrawBuffers=0x0 -> FALLBACK to per-attachment init
[POC-TRACE] BlitGL::clearRenderbuffer rb=92 sizedFmt=0x8d7c componentType=0x1405 isInt=1 -> issuing plain glClear
[4402:4402:0527/103302.635139:INFO:CONSOLE:13] "[POC] GL_VENDOR   = Google Inc. (Mesa/X.org)", source: http://127.0.0.1:8080/poc.html (13)
[4402:4402:0527/103302.635231:INFO:CONSOLE:13] "[POC] GL_RENDERER = ANGLE (Mesa/X.org, llvmpipe (LLVM 15.0.6 256 bits), OpenGL 4.5)", source: http://127.0.0.1:8080/poc.html (13)
[4402:4402:0527/103302.635290:INFO:CONSOLE:13] "[POC] GL_VERSION  = WebGL 2.0 (OpenGL ES 3.0 Chromium)", source: http://127.0.0.1:8080/poc.html (13)
[4402:4402:0527/103302.636271:INFO:CONSOLE:13] "[POC] total pixels read   : 1048576", source: http://127.0.0.1:8080/poc.html (13)
[4402:4402:0527/103302.636311:INFO:CONSOLE:13] "[POC] non-zero pixels     : 0", source: http://127.0.0.1:8080/poc.html (13)
[4402:4402:0527/103302.636338:INFO:CONSOLE:13] "[POC] sentinel-match pix  : 0", source: http://127.0.0.1:8080/poc.html (13)
[4402:4402:0527/103302.636362:INFO:CONSOLE:13] "[POC] No non-zero data observed on this driver. The buggy ANGLE code path (BlitGL::clearRenderbuffer -> plain glClear on RGBA8UI) was still exercised; either this native GL driver happens to apply glClear to integer attachments (spec leaves it undefined), or it zero-initializes fresh renderbuffer storage (e.g. software rasterizers backed by host RAM). On hardware GPUs that hand out un-zeroed VRAM and follow the spec, this returns stale cross-origin pixel data.", source: http://127.0.0.1:8080/poc.html (13)