[chaley]

Originally Posted by davidfor

It looks like it is the viewer as well. The following was in the same command-line window as for the editor.

Spoiler:

E:\CalibrePortable599\Calibre Portable\Calibre>calibre-debug.exe -w
DEBUG: 0.0 GetFileName::__init__.py - loading translations
devicePixelRatio: 1.0
logicalDpi: 96.0 x 96.0
physicalDpi: 127.66492146596858 x 127.59069767441859
Using calibre Qt style: False
qt.webenginecontext:

GL Type: desktop
Surface Type: OpenGL
Surface Profile: CompatibilityProfile
Surface Version: 4.4
QSG RHI Backend: OpenGL
Using Supported QSG Backend: yes
Using Software Dynamic GL: no
Using Multithreaded OpenGL: yes

Init Parameters:
* application-name calibre
* browser-subprocess-path E:\CalibrePortable599\Calibre Portable\Calibre\app\bin\QtWebEngineProcess.exe
* create-default-gl-context
* disable-es3-gl-context
* disable-features ConsolidatedMovementXY,InstalledApp,BackgroundFetc h,WebOTP,WebPayments,WebUSB,PictureInPicture
* disable-speech-api
* enable-features NetworkServiceInProcess,TracingServiceInProcess
* enable-threaded-compositing
* in-process-gpu
* use-gl desktop

Compiling viewer code...
QOpenGLShader::compile(Fragment): ERROR: 4:1: 'textureSampler' : syntax error syntax error


*** Problematic Fragment shader source code ***
#version 110
#ifdef GL_KHR_blend_equation_advanced
#extension GL_ARB_fragment_coord_conventions : enable
#extension GL_KHR_blend_equation_advanced : enable
#endif
#define lowp
#define mediump
#define highp
#line 1
varying highp vec2 uv;uniform sampler2DRect textureSampler;uniform bool swizzle;uniform highp float opacity;void main() { highp vec4 tmpFragColor = texture2DRect(textureSampler,uv); tmpFragColor.a *= opacity; gl_FragColor = swizzle ? tmpFragColor.bgra : tmpFragColor;}
***

E:\CalibrePortable599\Calibre Portable\Calibre>

I tried it and it works. Unfortunately we just had a power cut and I lost the log. One difference I saw is that I have "Surface version: 4.6" while DavidFor has 4.4. If that is the OpenGL version then that could explain it.