public class VertexColorShader : IPixelShader
{
    
    float3[] vertexColors = new[]
    {
        new float3(1.0f, 0.0f, 0.0f),
        new float3(0.0f, 1.0f, 0.0f),
        new float3(0.0f, 0.0f, 1.0f),
    };
    public float3 GetColor(float3 barycentric, int screenX, int screenY, int frame)
    {
        float amount1 = MathF.Cos(frame * 0.02f) * 0.5f + 0.5f;
        float amount2 = MathF.Sin(frame * 0.02f) * 0.5f + 0.5f;
        float3 c1 = new float3(vertexColors[0].x * amount1, vertexColors[0].y * amount1, vertexColors[0].z * amount1);
        float3 c2 = new float3(vertexColors[1].x * amount2, vertexColors[1].y * amount2, vertexColors[1].z * amount2);
        
        float3 color =  barycentric.x * c1 +
               barycentric.y * c2 +
               barycentric.z * vertexColors[2];
        
        // if((int)(screenX + MathF.Cos(frame * 0.02f) * 30) % 5 == 0 && (int)(screenY + MathF.Sin(frame * 0.02f) * 30) % 5 == 0) color += new float3(0.0f, 0.25f, 0.0f);
        if((int)(screenX) % 5 == 0 && (int)(screenY) % 5 == 0) color += new float3(0.0f, 0.25f, 0.0f);
        
        
        return color;
    }
}