ash/examples/texture/shader/triangle.frag

#version 450
#extension GL_ARB_separate_shader_objects : enable
#extension GL_ARB_shading_language_420pack : enable

layout (binding = 0) uniform UBO{
    vec3 color;
} ubo;
layout (location = 0) in vec4 o_color;
layout (location = 0) out vec4 uFragColor;

void main() {
    uFragColor = vec4(ubo.color, 1);
}