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POOpenGL ES 2.0/MonoTouch: Linker error
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  1. POOpenGL ES 2.0/MonoTouch: Linker error
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    copied!<p>i currently trying to get my model loader to work and got a error when binding new shader attributes.</p> <p>At this point i would post the error message, but MonoTouch don't let me do this. The only thing i got is "WARNING: Could n", seems to be a issue with MonoTouch, because i used a template of the framework.</p> <p>Here is the shader code:</p> <pre><code>&lt;Shader&gt; &lt;Uniforms&gt; &lt;Uniform type="mat4" name="modelViewMatrix"/&gt; &lt;/Uniforms&gt; &lt;Vertex&gt; &lt;Attributes&gt; &lt;Attribute type="vec3" name="position" binding="Position"/&gt; &lt;Attribute type="vec3" name="normal" binding="Normals"/&gt; &lt;!--&lt;Attribute type="vec4" name="color" binding="Color"/&gt;--&gt; &lt;/Attributes&gt; &lt;Code&gt;&lt;![CDATA[ attribute vec3 position; attribute vec3 normal; varying vec4 colorVarying; uniform mat4 modelViewMatrix; void main() { gl_Position = modelViewMatrix * vec4(position.xyz, 1.0); float z = gl_Position.z / 100.0; colorVarying = vec4(z, z, z, 1.0) ; } ]]&gt;&lt;/Code&gt; &lt;/Vertex&gt; &lt;Pixel&gt; &lt;Code&gt;&lt;![CDATA[ varying lowp vec4 colorVarying; void main() { gl_FragColor = colorVarying; } ]]&gt;&lt;/Code&gt; &lt;/Pixel&gt; &lt;/Shader&gt; </code></pre> <p>The shader works perfectly when removing the "normal" attribute. When adding it i got the following error from mono ( Not from OpenGL ) after calling GL.LinkProgram:</p> <pre><code>App(553,0xacb752c0) malloc: *** error for object 0x1025a3c4: incorrect checksum for freed object - object was probably modified after being freed. *** set a breakpoint in malloc_error_break to debug </code></pre> <p>I noticed that it has something to do with the attribute binding. Here is the code:</p> <pre><code>// Bind attribute locations for (int i = 0; i &lt; _VertexAttributeList.Length; i++) { ShaderAttribute attribute = _VertexAttributeList[i]; GL.BindAttribLocation(_Program, i, attribute.Name); } </code></pre> <p>When i replace "_VertexAttributeList.Length" with the constant 1 it works without any errors.</p> <p>Cheers Felix</p>
 

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