Add colour attribute to triangle vertices

shaders/frag.glsl

@@ -1,7 +1,8 @@
 #version 460 core
 
+in vec3 vert_colours;
 out vec4 color;
 
 void main() {
-  color = vec4(0.93f, 0.42f, 0.35f, 1.0f);
+  color = vec4(vert_colours.r, vert_colours.g, vert_colours.b, 1.0f);
 };

shaders/vert.glsl

@@ -1,7 +1,11 @@
 #version 460 core
 
-in vec4 position;
+layout(location=0) in vec3 position;
+layout(location=1) in vec3 vert_colour;
+
+out vec3 vert_colours;
 
 void main() {
-  gl_Position = vec4(position.x, position.y, position.z, position.w);
+  vert_colours = vert_colour;
+  gl_Position = vec4(position.x, position.y, position.z, 1.0f);
 };