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/* 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 "exp004base.h"
#include "../view/exp004state0.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 exp004state0
void
exp004base (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 * 20, sizeof (char));
free (S.base_vertices_data);
S.base_vertices_data = calloc (rows * 2, sizeof (float));
free (S.base_colors_data);
S.base_colors_data = calloc (rows * 4, sizeof (float));
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;
}
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