ReferenceError: _glGetString is not defined

[buggabugga]

Hi,

I'm trying to run glfw3.c test found here: https://github.com/emscripten-core/emscripten/blob/master/tests/glfw3.c, on emcc (Emscripten gcc/clang-like replacement) 1.38.30 ((unknown revision)), with the following command line:

emcc -s USE_GLFW=3 -s USE_WEBGL2=1 -lGL qqq.cpp -o qqq.html --emrun

I get errors when I run it in a browser (see below). Any help?

qqq.js:5574 Failed to execute 'requestFullscreen' on 'Element': API can only be initiated by a user gesture.

requestFullscreen @ qqq.js:5574

createWindow @ qqq.js:5866

_glfwCreateWindow @ qqq.js:5950

(anonymous) @ wasm-0004ecb2-373:558

Module._main @ qqq.js:6890

callMain @ qqq.js:7170

doRun @ qqq.js:7228

(anonymous) @ qqq.js:7239

setTimeout (async)

run @ qqq.js:7235

runCaller @ qqq.js:7147

removeRunDependency @ qqq.js:1531

receiveInstance @ qqq.js:1643

receiveInstantiatedSource @ qqq.js:1670

Promise.then (async)

createWasm @ qqq.js:1686

Module.asm @ qqq.js:1716

(anonymous) @ qqq.js:6797

qqq.js:4414 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.

_emscripten_set_main_loop_timing @ qqq.js:4414

_glfwSwapInterval @ qqq.js:6233

(anonymous) @ wasm-0004ecb2-373:792

Module._main @ qqq.js:6890

callMain @ qqq.js:7170

doRun @ qqq.js:7228

(anonymous) @ qqq.js:7239

setTimeout (async)

run @ qqq.js:7235

runCaller @ qqq.js:7147

removeRunDependency @ qqq.js:1531

receiveInstance @ qqq.js:1643

receiveInstantiatedSource @ qqq.js:1670

Promise.then (async)

createWasm @ qqq.js:1686

Module.asm @ qqq.js:1716

(anonymous) @ qqq.js:6797

qqq.html:1246 exception thrown: ReferenceError: _glGetString is not defined,ReferenceError: _glGetString is not defined

    at _glfwExtensionSupported (http://localhost:8080/qqq.js:5963:9)

    at wasm-function[373]:1708

    at Object.Module._main (http://localhost:8080/qqq.js:6890:33)

    at Object.callMain (http://localhost:8080/qqq.js:7170:30)

    at doRun (http://localhost:8080/qqq.js:7228:60)

    at http://localhost:8080/qqq.js:7239:7

printErr @ qqq.html:1246

emrun_printErr @ qqq.js:7375

callMain @ qqq.js:7190

doRun @ qqq.js:7228

(anonymous) @ qqq.js:7239

setTimeout (async)

run @ qqq.js:7235

runCaller @ qqq.js:7147

removeRunDependency @ qqq.js:1531

receiveInstance @ qqq.js:1643

receiveInstantiatedSource @ qqq.js:1670

Promise.then (async)

createWasm @ qqq.js:1686

Module.asm @ qqq.js:1716

(anonymous) @ qqq.js:6797

qqq.js:5963 Uncaught ReferenceError: _glGetString is not defined

    at _glfwExtensionSupported (qqq.js:5963)

    at wasm-function[373]:1708

    at Object.Module._main (qqq.js:6890)

    at Object.callMain (qqq.js:7170)

    at doRun (qqq.js:7228)

    at qqq.js:7239

_glfwExtensionSupported @ qqq.js:5963

(anonymous) @ wasm-0004ecb2-373:794

Module._main @ qqq.js:6890

callMain @ qqq.js:7170

doRun @ qqq.js:7228

(anonymous) @ qqq.js:7239

setTimeout (async)

run @ qqq.js:7235

runCaller @ qqq.js:7147

removeRunDependency @ qqq.js:1531

receiveInstance @ qqq.js:1643

receiveInstantiatedSource @ qqq.js:1670

Promise.then (async)

createWasm @ qqq.js:1686

Module.asm @ qqq.js:1716

(anonymous) @ qqq.js:6797

qqq.js:5574 Uncaught (in promise) TypeError: fullscreen error

    at Object.requestFullscreen (qqq.js:5574)

    at Object.createWindow (qqq.js:5866)

    at _glfwCreateWindow (qqq.js:5950)

    at wasm-function[373]:1178

    at Object.Module._main (qqq.js:6890)

    at Object.callMain (qqq.js:7170)

    at doRun (qqq.js:7228)

    at qqq.js:7239

[Alon Zakai]

Looking in the test suite code that compiles it, in tests/test_browser.py, it is built with -s LEGACY_GL_EMULATION=1 as it depends on some legacy functionality in GL. It should work with that.

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[キャロウ マーク]

On Jun 12, 2019, at 9:12, Alon Zakai <alon...@gmail.com> wrote:

Looking in the test suite code that compiles it, in tests/test_browser.py, it is built with -s LEGACY_GL_EMULATION=1 as it depends on some legacy functionality in GL. It should work with that.

That seems counterintuitive}. The only part of glGetString that is legacy is passing it the GL_EXTENSIONS query. That is no longer supported in Core OpenGL, though it still is in OpenGL ES, even the most recent which is 3.2. So calling glGetString should not require LEGACY_GL_EMULATION=1.

Regards

    -Mark

[Alon Zakai]

Good point, thanks Mark! Yeah, looking more carefully, it should work without that flag. The bug was a missing dependency, fix in

https://github.com/emscripten-core/emscripten/pull/8786

- Alon

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