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