#version 310 es precision mediump float; layout(location = 0) in vec4 v_fragmentColor; layout(location = 1) in vec2 v_texCoord; layout(binding = 0) uniform sampler2D u_tex0; layout(location = 0) out vec4 FragColor; void main() { float x = texture(u_tex0, v_texCoord).x; FragColor = vec4(v_fragmentColor.rgb, v_fragmentColor.a * x); }