From 89fc42251fd4be9bab1220b3e949221c46d0eaec Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Thu, 13 Sep 2012 23:43:04 -0400
Subject: [PATCH] create buffers for overlay hex tiles

---
 src/client/Client-gl.cc | 25 +++++++++++++++++++++++++
 src/client/Client.h     |  2 ++
 2 files changed, 27 insertions(+)

diff --git a/src/client/Client-gl.cc b/src/client/Client-gl.cc
index e8f207e..9490a06 100644
--- a/src/client/Client-gl.cc
+++ b/src/client/Client-gl.cc
@@ -32,6 +32,19 @@ static const char *obj_uniform_names[] = {
 #define OBJ_MODELVIEW obj_uniform_locations[6]
     "modelview"
 };
+/* points of a horizontal hexagon 1.0 units high */
+static const float overlay_hex_attributes[][2] = {
+    {0.0, 0.0},
+    {HEX_WIDTH_TO_HEIGHT / 2.0, 0.0},
+    {HEX_WIDTH_TO_HEIGHT / 4.0, 0.5},
+    {-HEX_WIDTH_TO_HEIGHT / 4.0, 0.5},
+    {-HEX_WIDTH_TO_HEIGHT / 2.0, 0.0},
+    {-HEX_WIDTH_TO_HEIGHT / 4.0, -0.5},
+    {HEX_WIDTH_TO_HEIGHT / 4.0, -0.5}
+};
+static const GLshort overlay_hex_indices[] = {
+    0, 1, 2, 3, 4, 5, 6
+};
 
 static bool load_file(const char *fname, WFObj::Buffer & buff)
 {
@@ -104,6 +117,18 @@ bool Client::initgl()
         cerr << "Error loading hex-tile model" << endl;
         return false;
     }
+    if (!m_overlay_hex_attributes.create(GL_ARRAY_BUFFER, GL_STATIC_DRAW,
+                overlay_hex_attributes, sizeof(overlay_hex_attributes)))
+    {
+        cerr << "Error creating overlay hex attribute buffer" << endl;
+        return false;
+    }
+    if (!m_overlay_hex_indices.create(GL_ELEMENT_ARRAY_BUFFER, GL_STATIC_DRAW,
+                overlay_hex_indices, sizeof(overlay_hex_indices)))
+    {
+        cerr << "Error creating overlay hex indices buffer" << endl;
+        return false;
+    }
     m_obj_program.get_uniform_locations(obj_uniform_names, NUM_OBJ_UNIFORMS,
             obj_uniform_locations);
     m_obj_program.use();
diff --git a/src/client/Client.h b/src/client/Client.h
index 6c321bb..8f6f5f7 100644
--- a/src/client/Client.h
+++ b/src/client/Client.h
@@ -36,6 +36,8 @@ class Client
         WFObj m_tile_obj;
         GLMatrix m_projection;
         GLMatrix m_modelview;
+        GLBuffer m_overlay_hex_attributes;
+        GLBuffer m_overlay_hex_indices;
 };
 
 #endif