Add GLSL cylinder files

src/noggit/rendering/glsl/cylinder_frag.glsl

@@ -0,0 +1,10 @@
+#version 330 core
+
+uniform vec4 color;
+
+out vec4 out_color;
+
+void main()
+{
+    out_color = color;
+}

src/noggit/rendering/glsl/cylinder_vert.glsl

@@ -0,0 +1,15 @@
+#version 330 core
+
+in vec4 position;
+
+uniform mat4 model_view_projection;
+uniform vec3 origin;
+uniform int height;
+uniform float radius;
+
+void main()
+{
+    vec3 offset = vec3(position.x * radius, position.y, position.z * radius);
+    vec3 p = origin + offset;
+    gl_Position = model_view_projection * vec4(p,1.);
+}