如何在OpenGL中使纹理透明？

#version 330 core
layout (location = 0) in vec4 vertex;

out vec2 TexCoords;

uniform mat4 model;
uniform mat4 projection;

void main()
{
    gl_Position = projection * model * vec4(vertex.xy, 0.0, 1.0);
    TexCoords = vertex.zw;
}

#version 330 core
out vec4 FragColor;

in vec2 TexCoords;

uniform sampler2D texture1;

void main()
{
    vec4 texColor = texture(texture1, TexCoords);
    if(texColor.a < 0.1)
        discard;
    FragColor = texColor;
}