Switch to translating the quad using a translation matrix

shaders/frag.glsl

@@ -3,8 +3,6 @@
 in vec3 vert_colours;
 out vec4 color;
 
-uniform float u_offset;
-
 void main() {
-  color = vec4(vert_colours.r, vert_colours.g + u_offset, vert_colours.b, 1.0f);
+  color = vec4(vert_colours.r, vert_colours.g, vert_colours.b, 1.0f);
 };

shaders/vert.glsl

@@ -3,11 +3,11 @@
 layout(location=0) in vec3 position;
 layout(location=1) in vec3 vert_colour;
 
-uniform float u_offset;
+uniform mat4 u_model;
 
 out vec3 vert_colours;
 
 void main() {
   vert_colours = vert_colour;
-  gl_Position = vec4(position.x, position.y + u_offset, position.z, 1.0f);
+  gl_Position = u_model * vec4(position, 1.0f);
 };