33 files changed, 530 insertions, 113 deletions

diff --git a/src/model/base.sqc b/src/model/base.sqc
new file mode 100644
index 0000000..901ccd7
--- a/dev/null
+++ b/src/model/base.sqc
@@ -0,0 +1,185 @@
+/* I seem to need this for glGenBuffers as per
+   http://www.gamedev.net/community/forums/topic.asp?topic_id=422358 */
+#define GL_GLEXT_PROTOTYPES
+
+#include "base.h"
+#include "../view/state0.h"
+#include "../util/check_error.h"
+#include <GL/glut.h>
+#include <string.h>
+#include <stdlib.h>
+#include "sqlca.h"
+extern struct sqlca sqlca;
+
+/*
+ * A simple alias to make the code more readable.
+ */
+#define S state0
+
+void
+base (void)
+{
+  /* 
+   * This implementation can be improved by mapping the video memory
+   * directly rather than loading into system memory and then copying
+   * into video memory.
+   */
+
+  /*
+   * db2dclgn -d exp004 -t coordinates
+   */
+  EXEC SQL BEGIN DECLARE SECTION;
+  EXEC SQL INCLUDE 'model/coordinates.h';
+  sqlint32 rows;
+  EXEC SQL END DECLARE SECTION;
+
+  /* Determine how many nodes have coordinates assigned to them. */
+  EXEC SQL SELECT COUNT (*) INTO:rows FROM coordinates;
+
+  /* Free any existing coordinates and allocate memory to store the
+     new values. */
+  S.rows = rows;
+
+  free (S.selection.set);
+  S.selection.set = calloc (rows, sizeof (bool));
+
+  free (S.gi_data);
+  S.gi_data = calloc (rows, sizeof (char) * 20);
+
+  free (S.base_vertices_data);
+  S.base_vertices_data = calloc (rows, sizeof (float) * 2);
+
+  free (S.base_colors_data);
+  S.base_colors_data = calloc (rows, sizeof (float) * 4);
+
+  EXEC SQL DECLARE c2 CURSOR FOR SELECT *FROM coordinates;
+
+  EXEC SQL OPEN c2;
+
+  /* 
+   * Initialize the bounding box of the points.
+   */
+  S.bb.min_x = 0.0;
+  S.bb.max_x = 0.0;
+  S.bb.min_y = 0.0;
+  S.bb.max_y = 0.0;
+
+  EXEC SQL FETCH c2 INTO:coordinates;
+  while (sqlca.sqlcode != 100)
+    {
+      int i = coordinates.coord_id - 1;
+
+      strncpy (S.gi_data + i, coordinates.gi.data, sizeof (S.gi_data[i]));
+
+      float *v = S.base_vertices_data + (i * 2);
+      *v = coordinates.x;
+      v++;
+      *v = coordinates.y;
+
+      v = S.base_vertices_data + (i * 2);
+      if (*v < S.bb.min_x)
+        S.bb.min_x = *v;
+      if (*v > S.bb.max_x)
+        S.bb.max_x = *v;
+
+      v++;
+      if (*v < S.bb.min_y)
+        S.bb.min_y = *v;
+      if (*v > S.bb.max_y)
+        S.bb.max_y = *v;
+
+      /*
+       * Deselected by default.
+       */
+      S.selection.set[i] = false;
+
+      float *c = S.base_colors_data + (i * 4);
+      *c = DEFAULT_COLOR_R;
+      c++;
+      *c = DEFAULT_COLOR_G;
+      c++;
+      *c = DEFAULT_COLOR_B;
+      c++;
+      *c = DEFAULT_COLOR_A;
+
+      EXEC SQL FETCH c2 INTO:coordinates;
+    }
+
+  EXEC SQL CLOSE c2;
+
+  EXEC SQL COMMIT;
+
+  /*
+   * Find the largest axis and use it to setup the projection.  This
+   * is done to preserve the aspect ratio.  The aspect ratio should be
+   * preserved since relative distance is a meaningful indicator in
+   * the map.
+   */
+
+  // Min of min x or min y.
+  if (S.bb.min_x <= S.bb.min_y)
+    S.ortho_min = S.bb.min_x;
+  else
+    S.ortho_min = S.bb.min_y;
+  S.ortho_min--;
+
+  // Max of max x or max y.
+  if (S.bb.max_x >= S.bb.max_y)
+    S.ortho_max = S.bb.max_x;
+  else
+    S.ortho_max = S.bb.max_y;
+  S.ortho_max++;
+
+  // Invert the y coordinate to match up with the LGL Java viewer.
+  float *v = S.base_vertices_data;
+  for (int i = 0; i < S.rows; i++)
+    {
+      v++;
+      *v = S.ortho_max - *v;
+      v++;
+    }
+
+  // Move the origin (0,0) to the center of the data.
+  S.ortho_min = 0.0;
+  S.ortho_max = 0.0;
+
+  v = S.base_vertices_data;
+  for (int i = 0; i < S.rows; i++)
+    {
+      *v = *v - (0.5 * (S.bb.max_x - S.bb.min_x));
+
+      if (S.ortho_min > *v)
+        S.ortho_min = *v;
+
+      if (S.ortho_max < *v)
+        S.ortho_max = *v;
+
+      v++;
+
+      *v = *v - (0.5 * (S.bb.max_y - S.bb.min_y));
+
+      if (S.ortho_min > *v)
+        S.ortho_min = *v;
+
+      if (S.ortho_max < *v)
+        S.ortho_max = *v;
+
+      v++;
+    }
+
+  glGenBuffers (2, S.buffers);
+
+  glBindBuffer (GL_ARRAY_BUFFER, S.buffers[BASE_VERTICES]);
+  glVertexPointer (2, GL_FLOAT, 0, 0);
+  glBufferData (GL_ARRAY_BUFFER,
+                sizeof (S.base_vertices_data), S.base_vertices_data,
+                GL_STATIC_DRAW);
+
+  glBindBuffer (GL_ARRAY_BUFFER, S.buffers[BASE_COLORS]);
+  glColorPointer (4, GL_FLOAT, 0, 0);
+  glBufferData (GL_ARRAY_BUFFER,
+                sizeof (S.base_colors_data), S.base_colors_data,
+                GL_STATIC_DRAW);
+
+  return;
+}