WEBGL_draw_buffers not supported in a machine that supports multiple render targets
Reported by
ferse...@gmail.com,
Oct 31 2017
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Issue description
UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Safari/604.1.38
Steps to reproduce the problem:
Execute the following line:
document.createElement("canvas").getContext("webgl").getSupportedExtensions().join("\n")
What is the expected behavior?
WEBG_draw_buffers is listed
What went wrong?
WEBGL_draw_buffers not listed in a machine that actually supports multiple render targerts. The extension is listed in the same machine, using Safari and Firefox.
in a 15" MacBook Pro retina, early 2013 (Intel HD4000 and envidia GTX650M), the extension IS NOT listed.
In a 12" MacBook early 2016 (Intel 520) the extension IT IS listed.
Did this work before? No
Does this work in other browsers? Yes
Chrome version: 61.0.3163.100 (Build oficial) (64 bits) Channel: n/a
OS Version: OS X 10.13
Flash Version:
,
Nov 1 2017
,
Nov 2 2017
I have noticed the following problem: Disable EXT_draw_buffers on GeForce GT 650M on Mac OS X due to driver bugs Applied Workarounds: disable_ext_draw_buffers But that does not explain why this extension works on Safari and Firefox.
,
Nov 2 2017
Thank you for providing more feedback. Adding requester "kbr@chromium.org" to the cc list and removing "Needs-Feedback" label. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
,
Nov 2 2017
OK, thanks for the info. This extension was disabled a long time ago on this particular GPU in Issue 180397 due to bad graphics driver bugs in the operating system leading to whole-machine hangs. (We didn't document this very well.) Each browser makes its own decisions about which features to blacklist and which graphics driver bug workarounds to enable. Please start Chrome from the Terminal with this command line: /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --user-data-dir=/tmp/t1 --disable_ext_draw_buffers=0 The extension should be enabled then. Can you do some tests and confirm that this seems to be working OK on your OS? If so I'll re-enable the extension on later OS releases. Also, you might need the additional flag: --disable-features=WebGLImageChromium because of other, new, graphics driver bugs in 10.13. See Issue 773705 and related bugs.
,
Nov 3 2017
It seems to work fine, and even at a higher frame rate than Firefox Quantum. I my test I have implemented a deferred render engine that uses multiple render buffers, several render passes, and the shaders are very complex (SSAO, SSRT, etc). It works fine and very stable.
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Nov 18 2017
,
Nov 18 2017
The following revision refers to this bug: https://chromium.googlesource.com/chromium/src.git/+/c0da091a05eb6ca8a74cfb3ac40dd4cd68ef7bbc commit c0da091a05eb6ca8a74cfb3ac40dd4cd68ef7bbc Author: Kenneth Russell <kbr@chromium.org> Date: Sat Nov 18 01:47:57 2017 Re-enable EXT_draw_buffers on NVIDIA Macs on newer macOS. Seems the earlier problems have been fixed. BUG= 779991 NOTRY=true Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel Change-Id: I8e5563ce02c2817e84611e0758edc44a19edc602 Reviewed-on: https://chromium-review.googlesource.com/775999 Commit-Queue: Kenneth Russell <kbr@chromium.org> Reviewed-by: Zhenyao Mo <zmo@chromium.org> Cr-Commit-Position: refs/heads/master@{#517672} [modify] https://crrev.com/c0da091a05eb6ca8a74cfb3ac40dd4cd68ef7bbc/gpu/config/gpu_driver_bug_list.json
,
Nov 18 2017
Calling this fixed. Please comment / reopen or file a new bug and email me the bug ID if problems persist. |
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Comment 1 by kbr@chromium.org
, Nov 1 2017Please provide about:gpu from your system. This is working fine on a nearly identical MacBook Pro: c = document.createElement('canvas') <canvas> gl = c.getContext('webgl') WebGLRenderingContext {canvas: canvas, drawingBufferWidth: 300, drawingBufferHeight: 150} gl.getSupportedExtensions() (25) ["ANGLE_instanced_arrays", "EXT_blend_minmax", "EXT_disjoint_timer_query", "EXT_frag_depth", "EXT_shader_texture_lod", "EXT_sRGB", "EXT_texture_filter_anisotropic", "WEBKIT_EXT_texture_filter_anisotropic", "OES_element_index_uint", "OES_standard_derivatives", "OES_texture_float", "OES_texture_float_linear", "OES_texture_half_float", "OES_texture_half_float_linear", "OES_vertex_array_object", "WEBGL_compressed_texture_s3tc", "WEBKIT_WEBGL_compressed_texture_s3tc", "WEBGL_compressed_texture_s3tc_srgb", "WEBGL_debug_renderer_info", "WEBGL_debug_shaders", "WEBGL_depth_texture", "WEBKIT_WEBGL_depth_texture", "WEBGL_draw_buffers", "WEBGL_lose_context", "WEBKIT_WEBGL_lose_context"] Graphics Feature Status Canvas: Software only, hardware acceleration unavailable CheckerImaging: Disabled Flash: Hardware accelerated Flash Stage3D: Hardware accelerated Flash Stage3D Baseline profile: Hardware accelerated Compositing: Hardware accelerated Multiple Raster Threads: Enabled Native GpuMemoryBuffers: Hardware accelerated Rasterization: Software only, hardware acceleration unavailable Video Decode: Hardware accelerated Video Encode: Hardware accelerated WebGL: Hardware accelerated WebGL2: Hardware accelerated Driver Bug Workarounds adjust_src_dst_region_for_blitframebuffer avoid_stencil_buffers decode_encode_srgb_for_generatemipmap disable_framebuffer_cmaa get_frag_data_info_bug msaa_is_slow needs_offscreen_buffer_workaround pack_parameters_workaround_with_pack_buffer regenerate_struct_names remove_invariant_and_centroid_for_essl3 scalarize_vec_and_mat_constructor_args set_zero_level_before_generating_mipmap unfold_short_circuit_as_ternary_operation unpack_alignment_workaround_with_unpack_buffer use_intermediary_for_copy_texture_image use_unused_standard_shared_blocks Problems Detected Macs with NVidia GPUs experience rendering issues on High Sierra: 773705 Disabled Features: accelerated_2d_canvas, gpu_rasterization Work around a bug in offscreen buffers on NVIDIA GPUs on Macs: 89557 Applied Workarounds: needs_offscreen_buffer_workaround Unfold short circuit on Mac OS X: 307751 Applied Workarounds: unfold_short_circuit_as_ternary_operation Always rewrite vec/mat constructors to be consistent: 398694 Applied Workarounds: scalarize_vec_and_mat_constructor_args Mac drivers handle struct scopes incorrectly: 403957 Applied Workarounds: regenerate_struct_names glGenerateMipmap fails if the zero texture level is not set on some Mac drivers: 560499 Applied Workarounds: set_zero_level_before_generating_mipmap Pack parameters work incorrectly with pack buffer bound: 563714 Applied Workarounds: pack_parameters_workaround_with_pack_buffer Alignment works incorrectly with unpack buffer bound: 563714 Applied Workarounds: unpack_alignment_workaround_with_unpack_buffer copyTexImage2D fails when reading from IOSurface on multiple GPU types.: 581777 Applied Workarounds: use_intermediary_for_copy_texture_image Limited enabling of Chromium GL_INTEL_framebuffer_CMAA: 535198 Applied Workarounds: disable_framebuffer_cmaa glGetFragData{Location|Index} works incorrectly on Max: 638340 Applied Workarounds: get_frag_data_info_bug Decode and encode before generateMipmap for srgb format textures on macosx: 634519 Applied Workarounds: decode_encode_srgb_for_generatemipmap Insert statements to reference all members in unused std140/shared blocks on Mac: 618464 Applied Workarounds: use_unused_standard_shared_blocks adjust src/dst region if blitting pixels outside read framebuffer on Mac: 644740 Applied Workarounds: adjust_src_dst_region_for_blitframebuffer Mac driver GL 4.1 requires invariant and centroid to match between shaders: 639760, 641129 Applied Workarounds: remove_invariant_and_centroid_for_essl3 Disable KHR_blend_equation_advanced until cc shaders are updated: 661715 Applied Workarounds: disable(GL_KHR_blend_equation_advanced), disable(GL_KHR_blend_equation_advanced_coherent) Certain Apple devices leak stencil buffers: 713854 Applied Workarounds: avoid_stencil_buffers On Intel GPUs MSAA performance is not acceptable for GPU rasterization: 527565, 751919 Applied Workarounds: msaa_is_slow Checker-imaging has been disabled via finch trial or the command line. Disabled Features: checker_imaging Version Information Data exported 10/31/2017, 6:24:08 PM Chrome version Chrome/62.0.3202.75 Operating system Mac OS X 10.13.0 Software rendering list version 13.13 Driver bug list version 10.30 ANGLE commit id e8ef2bc4bd01 2D graphics backend Skia/62 e74b41c6c84638d5a9ee6d254a715bcd9e17c603- Command Line /Applications/Google Chrome.app/Contents/MacOS/Google Chrome --flag-switches-begin --flag-switches-end Driver Information Initialization time 23 In-process GPU false Passthrough Command Decoder false Supports overlays false Sandboxed true GPU0 VENDOR = 0x10de, DEVICE= 0x0fe9 *ACTIVE* GPU1 VENDOR = 0x8086, DEVICE= 0x0d26 Optimus true Optimus true AMD switchable false Driver vendor Driver version 10.24.28 355.11.10.10.10.160 Driver date Pixel shader version 4.10 Vertex shader version 4.10 Max. MSAA samples 8 Machine model name MacBookPro Machine model version 11.3 GL_VENDOR NVIDIA Corporation GL_RENDERER NVIDIA GeForce GT 750M OpenGL Engine GL_VERSION 4.1 NVIDIA-10.24.28 355.11.10.10.10.160 GL_EXTENSIONS GL_ARB_blend_func_extended GL_ARB_draw_buffers_blend GL_ARB_draw_indirect GL_ARB_ES2_compatibility GL_ARB_explicit_attrib_location GL_ARB_gpu_shader_fp64 GL_ARB_gpu_shader5 GL_ARB_instanced_arrays GL_ARB_internalformat_query GL_ARB_occlusion_query2 GL_ARB_sample_shading GL_ARB_sampler_objects GL_ARB_separate_shader_objects GL_ARB_shader_bit_encoding GL_ARB_shader_subroutine GL_ARB_shading_language_include GL_ARB_tessellation_shader GL_ARB_texture_buffer_object_rgb32 GL_ARB_texture_cube_map_array GL_ARB_texture_gather GL_ARB_texture_query_lod GL_ARB_texture_rgb10_a2ui GL_ARB_texture_storage GL_ARB_texture_swizzle GL_ARB_timer_query GL_ARB_transform_feedback2 GL_ARB_transform_feedback3 GL_ARB_vertex_attrib_64bit GL_ARB_vertex_type_2_10_10_10_rev GL_ARB_viewport_array GL_EXT_debug_label GL_EXT_debug_marker GL_EXT_depth_bounds_test GL_EXT_framebuffer_multisample_blit_scaled GL_EXT_texture_compression_s3tc GL_EXT_texture_filter_anisotropic GL_EXT_texture_mirror_clamp GL_EXT_texture_sRGB_decode GL_APPLE_client_storage GL_APPLE_container_object_shareable GL_APPLE_flush_render GL_APPLE_object_purgeable GL_APPLE_rgb_422 GL_APPLE_row_bytes GL_APPLE_texture_range GL_ATI_texture_mirror_once GL_NV_texture_barrier Disabled Extensions GL_KHR_blend_equation_advanced GL_KHR_blend_equation_advanced_coherent Window system binding vendor Window system binding version Window system binding extensions Direct rendering Yes Reset notification strategy 0x0000 GPU process crash count 0 Compositor Information Tile Update Mode Zero-copy Partial Raster Enabled GpuMemoryBuffers Status ATC Software only ATCIA Software only DXT1 Software only DXT5 Software only ETC1 Software only R_8 GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT R_16 Software only RG_88 Software only BGR_565 Software only RGBA_4444 Software only RGBX_8888 Software only RGBA_8888 GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE BGRX_8888 GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE BGRA_8888 GPU_READ, SCANOUT, SCANOUT_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT RGBA_F16 GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT YVU_420 Software only YUV_420_BIPLANAR GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT UYVY_422 GPU_READ_CPU_READ_WRITE, GPU_READ_CPU_READ_WRITE_PERSISTENT