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POUnable to link compiled shaders (GLSL)
 

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  1. POUnable to link compiled shaders (GLSL)
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    <p>I have a small class that allows me to load shaders and use them in my program. I am able to compile the shaders, but when it's time to link them, they just don't want to. Using glGetProgramInfoLog I got the following error log. I don't understand why it tells me that there are no program defined since the compilation worked fine...</p> <pre><code>Vertex info ----------- (0) : error C3001: no program defined Fragment info ------------- (0) : error C3001: no program defined </code></pre> <p>The code below does the GLSL linking:</p> <pre><code>program_ = glCreateProgramObjectARB(); if (vertex_) { glAttachObjectARB(program_, vertex_); } if (fragment_) { glAttachObjectARB(program_, fragment_); } glLinkProgramARB(program_); </code></pre> <p>vertex_ and fragment_ are the vertex and fragment shader, and program_ is the ProgramObjectARB.</p> <p>I'd like to know what are the necessary modifications I need to do in order to make this run.</p> <p>Vertex shader:</p> <pre><code>varying vec4 OCPosition; // surface positon in world's coordinates varying vec4 ECposition; // surface position in eye coordinates varying vec4 ECballCenter; // ball center in eye coordinates uniform vec4 BallCenter; // ball center in modelling coordinates void main() { OCPosition = gl_Vertex; ECposition = gl_ModelViewMatrix * OCPosition; ECballCenter = gl_ModelViewMatrix * BallCenter; gl_Position = gl_ProjectionMatrix * ECposition; } </code></pre> <p>Fragment shader:</p> <pre><code>varying vec4 OCPosition; // surface position in world coordinates varying vec4 ECposition; // surface position in eye coordinates varying vec4 ECballCenter; // ball center in eye coordinates uniform vec4 LightDir; // light direction, should be normalized uniform vec4 HVector; // reflection vector for infinite light source uniform vec4 SpecularColor; uniform vec4 BaseColor, StripeColor; uniform float StripeWidth; // = 0.3 uniform float FWidth; // = 0.005 void main() { vec3 normal; // Analytically computed normal vec4 p; // Point in shader space vec4 surfColor; // Computed color of the surface float intensity; // Computed light intensity vec4 distance; // Computed distance values float inorout; // Counter for computing star pattern p.xyz = normalize(OCPosition.xyz); // Calculate p p.w = 1.0; distance.y = StripeWidth - abs(p.z); distance.xy = smoothstep(-FWidth, FWidth, distance.xy); surfColor = mix(BaseColor, StripeColor, distance.y); // normal = point on surface for sphere at (0,0,0) normal = normalize(ECposition.xyz - ECballCenter.xyz); // Per fragment diffuse lighting intensity = 0.2; // ambient intensity += 0.8 * clamp(dot(LightDir.xyz, normal), 0.0, 1.0); surfColor *= intensity; // Per fragment specular lighting intensity = clamp(dot(HVector.xyz, normal), 0.0, 1.0); intensity = pow(intensity, SpecularColor.a); surfColor += SpecularColor * intensity; gl_FragColor = surfColor; } </code></pre> <p><strong>EDIT - SOLUTION</strong> It seems the method I used to read the source file was incorrect. The shader would compile, but at linking, it was not working correctly. Now I use this method to read my file and the linking is correct:</p> <pre><code>char *textFileRead(char *fn) { FILE *fp; char *content = NULL; int count=0; if (fn != NULL) { fp = fopen(fn,"rt"); if (fp != NULL) { fseek(fp, 0, SEEK_END); count = ftell(fp); rewind(fp); if (count &gt; 0) { content = (char *)malloc(sizeof(char) * (count+1)); count = fread(content,sizeof(char),count,fp); content[count] = '\0'; } fclose(fp); } } return content; } </code></pre>
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