Setup projection matrix and position the quad properly

shaders/vert.glsl

@@ -4,10 +4,11 @@ layout(location=0) in vec3 position;
 layout(location=1) in vec3 vert_colour;
 
 uniform mat4 u_model;
+uniform mat4 u_projection;
 
 out vec3 vert_colours;
 
 void main() {
   vert_colours = vert_colour;
-  gl_Position = u_model * vec4(position, 1.0f);
+  gl_Position = u_projection * u_model * vec4(position, 1.0f);
 };