[osg-users] GLES link error for unidentified Program

Alessandro Terenzi a.terenzi at gmail.com
Wed Jan 24 08:18:01 PST 2018 

Hi,
I used to work with OSG 3.4.0 (stable) and now I'm trying version 3.5.10 on iOS (trying both GLES 2 and 3) but now I having the following error when the first frame is drawn:

glLinkProgram 0x1c41cda70"" FAILED
Program "" infolog:
ERROR: OpenGL ES requires exactly one vertex and one fragment shader to validly link.

Note that I have only one quad to which I apply a texture, I'm using a single 'vertex' and 'fragment shader' and there's only on 'program' around. The same code works fine with OSG 3.4.0 and even though with version 3.5.10 there is the above error, the texture is nonetheless displayed.

If I use a more verbose notification level I see that my program "BckProgram" is compiled and linked correctly but then another program with empty name is tried to be linked and it is the one for which I'm receiving the above error, but I did not create a second program anywhere... am I missing something?

And here's the verbose log:

View::init()
cull()
cull() got SceneView 0x106510300
ShaderComposer::~ShaderComposer() 0x1c02d7450
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
end cull() 0x1065101f0
draw() got SceneView 0x106510300
Renderer::compile()
State::convertShaderSourceToOsgBuiltIns()
++Before Converted source 
varying vec2 texcoord;
void main(void)
{
    texcoord = gl_MultiTexCoord0.xy;
    gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
}

++++++++
-------- Converted source 
attribute vec4 osg_MultiTexCoord0;
attribute vec4 osg_Vertex;
uniform mat4 osg_ModelViewProjectionMatrix;
varying vec2 texcoord;
void main(void)
{
    texcoord = osg_MultiTexCoord0.xy;
    gl_Position = osg_ModelViewProjectionMatrix * osg_Vertex;
}

----------------

Compiling A :VERTEX source:
    1: attribute vec4 osg_MultiTexCoord0;
    2: attribute vec4 osg_Vertex;
    3: uniform mat4 osg_ModelViewProjectionMatrix;
    4: varying vec2 texcoord;
    5: void main(void)
    6: {
    7:     texcoord = osg_MultiTexCoord0.xy;
    8:     gl_Position = osg_ModelViewProjectionMatrix * osg_Vertex;
    9: }

State::convertShaderSourceToOsgBuiltIns()
++Before Converted source 
precision mediump float;
uniform sampler2D texture0;
varying vec2 texcoord;
void main(void)
{
    gl_FragColor = texture2D( texture0, vec2(texcoord.x, 1.0-texcoord.y));
}

++++++++
-------- Converted source 
precision mediump float;
uniform sampler2D texture0;
varying vec2 texcoord;
void main(void)
{
    gl_FragColor = texture2D( texture0, vec2(texcoord.x, 1.0-texcoord.y));
}

----------------

Compiling A :FRAGMENT source:
    1: precision mediump float;
    2: uniform sampler2D texture0;
    3: varying vec2 texcoord;
    4: void main(void)
    5: {
    6:     gl_FragColor = texture2D( texture0, vec2(texcoord.x, 1.0-texcoord.y));
    7: }

Linking osg::Program "BckProgram" id=3 contextID=0
State's vertex attrib binding 2, osg_Color
State's vertex attrib binding 12, osg_FogCoord
State's vertex attrib binding 3, osg_MultiTexCoord0
State's vertex attrib binding 4, osg_MultiTexCoord1
State's vertex attrib binding 5, osg_MultiTexCoord2
State's vertex attrib binding 6, osg_MultiTexCoord3
State's vertex attrib binding 7, osg_MultiTexCoord4
State's vertex attrib binding 8, osg_MultiTexCoord5
State's vertex attrib binding 9, osg_MultiTexCoord6
State's vertex attrib binding 10, osg_MultiTexCoord7
State's vertex attrib binding 1, osg_Normal
State's vertex attrib binding 11, osg_SecondaryColor
State's vertex attrib binding 0, osg_Vertex
Program "BckProgram" link succeeded, infolog:
WARNING: Could not find vertex shader attribute 'osg_MultiTexCoord7' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_MultiTexCoord5' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_SecondaryColor' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_MultiTexCoord1' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_MultiTexCoord6' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_FogCoord' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_Normal' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_Color' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_MultiTexCoord4' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_MultiTexCoord2' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'osg_MultiTexCoord3' to match BindAttributeLocation request.

	Uniform "texture0" loc=4 size=1 type=sampler2D
	Uniform "osg_ModelViewProjectionMatrix" loc=0 size=1 type=mat4
	Attrib "osg_MultiTexCoord0" loc=3 size=1
	Attrib "osg_Vertex" loc=0 size=1

Created new 0x1c41294c0 TextureObject, _numOfTextureObjects 1
Warning: detected OpenGL error 'invalid enumerant' at after stateset.compileGLObjects in GLObjectsVisitor::apply(osg::StateSet& stateset)
OpenGL extension '' is not supported.
Adding parent0x1c02327e0
Adding parent0x1c02327e0
RenderStage::runCameraSetUp(osg::RenderInfo& renderInfo) 0x1063270e0
Setting up osg::Camera::FRAME_BUFFER
GLBufferObjectSet::GLBufferObjectSet _profile._size=80
    Allocating new glBufferData(), _allocatedSize=80
2018-01-24 16:58:10.501060+0100 CameraCaptureExample[7697:6519318] deviceOrientationDidChange: 5
Created new 0x1c41296a0 TextureObject, _numOfTextureObjects 1
Warning: detected OpenGL error 'invalid enumerant' at after RenderBin::draw(..)
Linking osg::Program "" id=4 contextID=0
State's vertex attrib binding 2, osg_Color
State's vertex attrib binding 12, osg_FogCoord
State's vertex attrib binding 3, osg_MultiTexCoord0
State's vertex attrib binding 4, osg_MultiTexCoord1
State's vertex attrib binding 5, osg_MultiTexCoord2
State's vertex attrib binding 6, osg_MultiTexCoord3
State's vertex attrib binding 7, osg_MultiTexCoord4
State's vertex attrib binding 8, osg_MultiTexCoord5
State's vertex attrib binding 9, osg_MultiTexCoord6
State's vertex attrib binding 10, osg_MultiTexCoord7
State's vertex attrib binding 1, osg_Normal
State's vertex attrib binding 11, osg_SecondaryColor
State's vertex attrib binding 0, osg_Vertex
glLinkProgram 0x1c41cda70"" FAILED
Program "" infolog:
ERROR: OpenGL ES requi2018-01-24 16:58:10.503075+0100 CameraCaptureExample[7697:6519318] ...
res exactly one vertex and one fragment shader to validly link.

Program "" infolog:
ERROR: OpenGL ES requires exactly one vertex and one fragment shader to validly link.

cull()
cull() got SceneView 0x106326740
ShaderComposer::~ShaderComposer() 0x1c02d74c0
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
Uniform Adding parent
end cull() 0x1065101f0
end draw() 0x1065101f0
draw() 0x1065101f0
draw() got SceneView 0x106326740
OpenGL extension '' is not supported.
Adding parent0x1c02327e0
Adding parent0x1c02327e0
RenderStage::runCameraSetUp(osg::RenderInfo& renderInfo) 0x106327d30
Setting up osg::Camera::FRAME_BUFFER
2018-01-24 16:58:10.510586+0100 CameraCaptureExample[7697:6519318] ...
cull()
cull() got SceneView 0x106510300
end cull() 0x1065101f0
end draw() 0x1065101f0
draw() 0x1065101f0
draw() got SceneView 0x106510300
end draw() 0x1065101f0

After this the cull/draw calls repeat without errors.

Thank you!
Alessandro

------------------
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http://forum.openscenegraph.org/viewtopic.php?p=72854#72854

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