Update

res/shaders/vertex.frag

@@ -0,0 +1,10 @@
+#version 450
+#extension GL_ARB_separate_shader_objects: enable
+
+layout (location = 0) in vec3 fragColor;
+
+layout (location = 0) out vec4 outColor;
+
+void main() {
+    outColor = vec4(fragColor, 1.0);
+}

res/shaders/vertex.vert

@@ -0,0 +1 @@
+#version 450
#extension GL_ARB_separate_shader_objects: enable

// NOTE: names must match the `Vertex` struct in Rust
layout (location = 0) in vec2 pos;
layout (location = 1) in vec3 color;

layout (location = 0) out vec3 fragColor;

out gl_PerVertex {
    vec4 gl_Position;
};

void main() {
    gl_Position = vec4(pos, 0.0, 1.0);
    fragColor = color;
}