如何使用GLSL渲染多个纹理

// 顶点着色器
#version 330 core
layout (location = 0) in vec3 aPos;
layout (location = 1) in vec2 aTexCoord1;
layout (location = 2) in vec2 aTexCoord2;

out vec2 TexCoord1;
out vec2 TexCoord2;

void main()
{
    gl_Position = vec4(aPos, 1.0);
    TexCoord1 = aTexCoord1;
    TexCoord2 = aTexCoord2;
}

// 片段着色器
#version 330 core
out vec4 FragColor;

in vec2 TexCoord1;
in vec2 TexCoord2;

uniform sampler2D texture1;
uniform sampler2D texture2;

void main()
{
    vec4 color1 = texture(texture1, TexCoord1);
    vec4 color2 = texture(texture2, TexCoord2);
    FragColor = mix(color1, color2, 0.5);
}