Qt3D Demos: "QOpenGLShader::compile(Vertex): ERROR: 2:1: '' : syntax error: #version is mandatory and should be set before any other token" + "QOpenGLShader::link: "ERROR: Definition for \"void main()\" not found.\n"

[privet]

The "normal" Qt Demos of Qt 5.5 are working fine when opening + building with QtCreator 3.4.2
but
None of the Qt3D Demos are working; they compile fine, but fail during execution with a black screen and the below error output
( see also screenshot: http://privet.bplaced.net/temp/qt55_qt3d_examples.png )
What is wrong?
How can I fix this?

---

Starte C:\Qt\5.5\Src\qt3d\build-examples-5_5_desktop_64bit_vs2013-Release\qt3d\anaglyph-rendering\release\anaglyph-rendering.exe...
QOpenGLShader::compile(Vertex): ERROR: 2:1: '' : syntax error: #version is mandatory and should be set before any other token

*** Problematic Vertex shader source code ***
#define lowp
#define mediump
#define highp
#line 1
attribute vec3 vertexPosition;
varying vec3 texCoord0;

uniform mat4 mvp;
uniform mat4 inverseProjectionMatrix;
uniform mat4 inverseModelView;

void main()
{
texCoord0 = vertexPosition.xyz;
gl_Position = vec4(mvp * vec4(vertexPosition, 1.0)).xyww;
}

---

Failed to compile shader: "ERROR: 2:1: '' : syntax error: #version is mandatory and should be set before any other token\n\n"
QOpenGLShader::compile(Fragment): ERROR: 2:1: '' : syntax error: #version is mandatory and should be set before any other token

*** Problematic Fragment shader source code ***
#define lowp
#define mediump
#define highp
#line 1
varying highp vec3 texCoord0;
uniform samplerCube skyboxTexture;

void main()
{
gl_FragColor = textureCube(skyboxTexture, texCoord0);
}

---

Failed to compile shader: "ERROR: 2:1: '' : syntax error: #version is mandatory and should be set before any other token\n\n"
QOpenGLShader::link: "Link called without any attached shader objects.\n"
Failed to link shader program: "Link called without any attached shader objects.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::compile(Vertex): ERROR: 2:1: '' : syntax error: #version is mandatory and should be set before any other token

*** Problematic Vertex shader source code ***
#define lowp
#define mediump
#define highp
#line 1
attribute vec3 vertexPosition;
attribute vec3 vertexNormal;

varying vec3 position;
varying vec3 normal;

uniform mat4 modelView;
uniform mat3 modelViewNormal;
uniform mat4 mvp;

void main()
{
normal = normalize( modelViewNormal * vertexNormal );
position = vec3( modelView * vec4( vertexPosition, 1.0 ) );

gl_Position = mvp * vec4( vertexPosition, 1.0 );

}

---

Failed to compile shader: "ERROR: 2:1: '' : syntax error: #version is mandatory and should be set before any other token\n\n"
QOpenGLShader::compile(Fragment): ERROR: 2:3: '' : syntax error: #version is mandatory and should be set before any other token

*** Problematic Fragment shader source code ***
#define lowp
#define mediump
#define highp
#line 1
#define FP highp

uniform FP vec4 lightPosition;
uniform FP vec3 lightIntensity;

// TODO: Replace with a struct
uniform FP vec3 ka; // Ambient reflectivity
uniform FP vec3 kd; // Diffuse reflectivity
uniform FP vec3 ks; // Specular reflectivity
uniform FP float shininess; // Specular shininess factor

varying FP vec3 position;
varying FP vec3 normal;

FP vec3 adsModel( const FP vec3 pos, const FP vec3 n )
{
// Calculate the vector from the light to the fragment
FP vec3 s = normalize( vec3( lightPosition ) - pos );

// Calculate the vector from the fragment to the eye position
// (origin since this is in "eye" or "camera" space)
FP vec3 v = normalize( -pos );

// Reflect the light beam using the normal at this fragment
FP vec3 r = reflect( -s, n );

// Calculate the diffuse component
FP float diffuse = max( dot( s, n ), 0.0 );

// Calculate the specular component
FP float specular = 0.0;
if ( dot( s, n ) > 0.0 )
    specular = pow( max( dot( r, v ), 0.0 ), shininess );

// Combine the ambient, diffuse and specular contributions
return lightIntensity * ( ka + kd * diffuse + ks * specular );

}

void main()
{
gl_FragColor = vec4( adsModel( position, normalize( normal ) ), 1.0 );
}

---

Failed to compile shader: "ERROR: 2:3: '' : syntax error: #version is mandatory and should be set before any other token\n\n"
QOpenGLShader::link: "Link called without any attached shader objects.\n"
Failed to link shader program: "Link called without any attached shader objects.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"
QOpenGLShader::link: "ERROR: Definition for "void main()" not found.\n"

[Sergey Perevalov]

Actually, compiler may be pointing on your mistake. You haven't set version of GLSL in your shaders.

[privet]

@Sergey-Perevalov
wow, is the version of GLSL in the shaders not set in the Qt5.5-Qt3D code base?
(as the errors root cause is in the code of the lib, not in the demo-code)
Does that mean, that none of the demos is working?
Does that mean, that nobody has now working Qt5.5-Qt3D code-base?
That would be a big mistake in the Qt5.5 Release...
That would mean, that nobody can work with Qt5.5-Qt3D...
:-(

[Sergey Perevalov]

Well, I'm working with Qt3D right now and it works just fine.
Try to add
#version 150 core
at the beginning of your shaders.
By the way, Qt3D module right now is only a technological preview, so some features still not implemented. It is enough for simple renders though.

[privet]

@Sergey-Perevalov
I was looking at one of the examples
%Qt%\5.5\Src\qt3d\examples\qt3d\anaglyph-rendering
and was looking for the problematic code part ... without success!
See screenshots:
http://privet.bplaced.net/temp/qt55_qt3d_example_project_all_sources.png
(showing all sources of the demo on the left, which file do you mean?)
(in the project, there are no .frag/.vert/.shr files, also no shader in the .qml/.cpp files)
http://privet.bplaced.net/temp/qt55_qt3d_example_issue_is_not_in_project.png
(showing when I search for the problematic code from error messages, founding nothing)
(also nothing found in the examples dir if I search on the file system)
(error messages: http://privet.bplaced.net/temp/qt55_qt3d_examples.txt)

Is your app working really on all 'normal' machines, also inside of virtual machines?
Also with (weak?) Intel graphic cards (Intel HD Graphics 3000)?

[Sergey Perevalov]

These examples work fine on Intel HD Graphics 4400 and on my Android device.
I looked through the anaglyph rendering example and haven't found any shader references either. That's strange, the problem is obviously in shaders, but I have no clue how to gain access to their source code. Maybe they are located somewhere else in the Qt folder.

[yoavmil]

I found the solution:
at Window::Window(), mark out this line

format.setVersion(4, 3);

for some reason, it makes the Qt3D to think your PC is a ES2 device, making it select the ES2 shaders, which doesn't have the #version whatever line.

for the Qt developers, look at void Renderer::buildDefaultTechnique() , at if (m_graphicsContext->openGLContext()->isOpenGLES()) {

the isOpenGLES() is wrong on my PC.

[privet]

workaround: see
https://forum.qt.io/topic/57239/qt3d-basic-shapes-c-example-doesn-t-run/5