pass a uniform

src/shaders/triangle.vert

@@ -1,11 +1,15 @@
 #version 450
 
-layout(location = 0) in vec4 a_pos;
-layout(location = 1) in vec3 a_color;
+layout (set = 0, binding = 0) uniform CameraBuffer {
+    mat4 viewproj;
+} cam;
 
-layout(location = 0) out vec3 v_color;
+layout (location = 0) in vec4 a_pos;
+layout (location = 1) in vec3 a_color;
+
+layout (location = 0) out vec3 v_color;
 
 void main() {
-    gl_Position = a_pos;
+    gl_Position = a_pos * cam.viewproj;
     v_color = a_color;
 }