In Qt's Qt 3D Wireframe QML example, the vertex shader code looks as follows:
#version 330 core
in vec3 vertexPosition;
in vec3 vertexNormal;
out EyeSpaceVertex {
vec3 position;
vec3 normal;
} vs_out;
uniform mat4 modelView;
uniform mat3 modelViewNormal;
uniform mat4 mvp;
void main()
{
vs_out.normal = normalize( modelViewNormal * vertexNormal );
vs_out.position = vec3( modelView * vec4( vertexPosition, 1.0 ) );
gl_Position = mvp * vec4( vertexPosition, 1.0 );
}
None of the uniform variables above are initialized in the example's source code, so they must receive default values as explained in the doc for ShaderProgram, which states:
Qt3D will automatically populate a set of default uniforms if they are encountered during the shader instrospection phase.
The list of "default uniforms" is given as well.
I tried to find the part in the Qt source code where these uniforms are assigned their default values (which I guess are identity matrices), but couldn't somehow. Any ideas?
