1 files changed, 28 insertions, 2 deletions
diff --git a/glsl/shader_2d_wired.vert.glsl b/glsl/shader_2d_wired.vert.glsl
index 97330dc..28cc55f 100644
--- a/glsl/shader_2d_wired.vert.glsl
+++ b/glsl/shader_2d_wired.vert.glsl
@@ -15,16 +15,42 @@
  */
 
 #version 450
+#extension GL_ARB_separate_shader_objects : enable
 
-layout(location = 0) in vec2 in_position;
+layout(location = 0) out int out_instance_index;
 
 layout(set = 0, binding = 0) uniform UBOView2D
 {
   mat4 proj;
 } ubo_view;
 
+layout(set = 1, binding = 0) uniform UBORectangles
+{
+  vec4 positions[128];
+} ubo_sprite_positions;
+
 void
 main()
 {
-  gl_Position = ubo_view.proj * vec4(in_position, 0.0, 1.0);
+  vec2 coordinate;
+  vec4 position = ubo_sprite_positions.positions[gl_InstanceIndex];
+
+  out_instance_index = gl_InstanceIndex;
+
+  switch(gl_VertexIndex)
+  {
+  case 0:
+    coordinate = vec2(position.x, position.y);
+    break;
+  case 1:
+    coordinate = vec2(position.x, position.w);
+    break;
+  case 2:
+    coordinate = vec2(position.z, position.y);
+    break;
+  case 3:
+    coordinate = vec2(position.z, position.w);
+    break;
+  }
+  gl_Position = ubo_view.proj * vec4(coordinate, 0.0, 1.0);
 }