Shader creation Opengl - opengl

Question

I am using OpenGl 3 and the tutorial from BennyBox on Youtube.
Using this method:
static void CheckShaderError(GLuint shader, GLuint flag, bool isProgram, const std::string& errorMessage){
GLint success = 0;
GLchar error [1024] = {0};
if(isProgram){
glGetProgramiv(shader, flag, &success);
}else{
glGetShaderiv(shader, flag, &success);
}
if(success == GL_FALSE){
if(isProgram){
glGetProgramInfoLog(shader, sizeof(error), NULL, error);
}else{
glGetShaderInfoLog(shader,sizeof(error), NULL, error);
}
std::cerr<< errorMessage<< ": " << error<< "'"<<std::endl;
}
}
I should be able to load shader file (fragment and vertex shaders). It works with basic shaders but when I try to modify them to that point:
#version 120
attribute vec3 position;
attribute vec2 texCoord;
varying vec2 texCoord;
void main(){
gl_Position = vec4(position, 1.0);
texCoord0 = texCoord;
}
The I get:
Error compiling shader!: 'ERROR: 0:6: 'texCoord' : redefinition
ERROR: 0:11: 'texCoord0' : undeclared identifier
ERROR: 0:11: 'assign' : cannot convert from 'attribute 2-component vector of float' to 'float'
and the fragment shader:
#version 120
uniform sampler2D diffuse;
varying vec2 texCoord0;
void main(){
gl_FragColor = texture2D(diffuse, texCoord0);
}
gives:
Unable to load shader: ./res/basicShader.fs
Error linking shader program: 'Attached vertex shader is not compiled.
I have the exact same code as the video, and it runs fine using basic coloring shader. I am on Visual Studio 2012.

Answer 1

There are two errors in your vertex shader.
First, you are declaring texCoord twice.
attribute vec2 texCoord;
varying vec2 texCoord;
Then you are trying to use a varying called texCoord0, without ever declaring it.
texCoord0 = texCoord;
Your vertex shader should look like this:
#version 120
attribute vec3 position;
attribute vec2 texCoord;
varying vec2 texCoord0;
void main(){
gl_Position = vec4(position, 1.0);
texCoord0 = texCoord;
}