DemoShader.txt

Vertex:
#version 330 core


in vec3 position;
in vec3 normal;
in vec2 texCoord;


uniform mat4 mvp;
uniform mat4 model;
uniform mat4 view;
uniform vec3 ambient;
uniform float specExp;


uniform struct {
        vec3 dir;
        vec3 color;
} light;


out vec3 color;
out vec2 texC;


void main() {
        gl_Position = mvp * vec4(position, 1);
        
        vec3 normalWorld = inverse(transpose(mat3(model))) * normal;
        normalWorld = normalize(normalWorld);
        
        float nDotL = dot(normalWorld, -normalize(light.dir));
        nDotL = max(0, nDotL);
        
        vec4 positionWorld = model * vec4(position, 1);
        vec4 cameraEyeWorld = inverse(view) * vec4(0,0,0,1);
        vec4 vertexToEye = cameraEyeWorld - positionWorld;
        vec3 lightReflected = reflect(light.dir, normalWorld);
        vertexToEye = normalize(vertexToEye);
        vec4 lightReflected4 = normalize(vec4(lightReflected, 0));
        
        float spec = pow(max(0, dot(vertexToEye, lightReflected4)), specExp);
        
        color = ambient + light.color * nDotL + light.color * spec;
        
        texC = texCoord;
}




Frag:
#version 330 core


out vec4 fragColor;


uniform sampler2D tex;


in vec3 color;
in vec2 texC;


void main() {
        vec4 textureColor = texture(tex, texC);
        fragColor = vec4(color * textureColor.rgb, 1);
}