着色器（练习）

float offset = 0.5f; 
ourShader.setFloat("xOffset", offset);

#version 330 core layout (location = 0) in vec3 aPos; 
layout (location = 1) in vec3 aColor; 
out vec3 ourColor; 
uniform float xOffset; 
void main() { 
    gl_Position = vec4(aPos.x + xOffset, aPos.y, aPos.z, 1.0); // add the xOffset to the x position of the vertex position 
    ourColor = aColor; 
}

#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec3 aColor;

// out vec3 ourColor;
out vec3 ourPosition;

void main()
{
    gl_Position = vec4(aPos, 1.0); 
    // ourColor = aColor;
    ourPosition = aPos;
}

#version 330 core
out vec4 FragColor;
// in vec3 ourColor;
in vec3 ourPosition;

void main()
{
    FragColor = vec4(ourPosition, 1.0);    // note how the position value is linearly interpolated to get all the different colors
}