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LEFTONE/core/loshader/menu_text.fshader

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layout (location = 0) uniform sampler2D u_tex;
layout (location = 1) uniform float u_alpha;
in vec2 v_uv;
in vec4 v_color;
out vec4 o_color;
void main(void) {
float a = texture(u_tex, v_uv).r;
o_color = vec4(v_color.rgb, v_color.a*a*u_alpha);
}