Archived issue #0031668

Visualization - WebGL sample doesn't work on Emscripten 1.39

Open CASCADEOCCT:Visualizationclosed12 public notes

Description

Building WebGL sample using latest Emscripten release 1.39 switched from fastcomp to upstream (LLVM) toolchain results in numerous errors and non-working input.

First blocking error:

Uncaught (in promise) DOMException: Document.querySelector: '0' is not a valid selector occt-webgl-sample.js:9416

next error specific to eglSetSwapInterval():

emscripten_set_main_loop_timing: Cannot set timing mode for main loop since a main loop does not exist! Call emscripten_set_main_loop first to set one up.

another one related to eglGetProcAddress() for functions required by OpenGL ES 3.0 specs:

TKOpenGl | Type: Error | ID: 0 | Severity: High | Message:
  Error! OpenGL context reports version 3.0 but does not export required functions for 3.0 (glMapBufferRange)
Please report this issue to OpenGL driver vendor 'mozilla'

Public activity

12 archived notes

Participants are labeled by their role within this record.

01Commenter 22020-07-16 16:13

Branch [archived branch] has been created by Author.

[revision removed]

Detailed log of new commits:

Author: Author
Date: Thu Jul 16 16:15:22 2020 +0300

    0031668: Visualization - WebGL sample doesn't work on latest Emscripten

    OpenGl_Context now skips loading functions related to mapping buffer,
    which are required by OpenGL ES 3.0 specs but not provided by WebGL 2.0.

    WasmOcctView::initWindow() - callbacks now set using EMSCRIPTEN_EVENT_TARGET_WINDOW
    instead of 0 used by older Emscripten API.
    Added emscripten_set_main_loop() setup to shut up eglSetSwapInterval() error.

02Commenter 22020-07-16 16:39