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Add fps counter (by Malte)

This commit is contained in:
hasufell 2014-05-16 00:32:38 +02:00
parent be95307ceb
commit a3bac07c2b
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GPG Key ID: 220CD1C5BDEED020
1 changed files with 37 additions and 0 deletions
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37
src/gl_draw.c
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@ -37,9 +37,12 @@
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#define XY_WIRE_COUNT 10.0f
#define FPS_OUT_SIZE 17
#define ROT_FACTOR_PLANET_SUN (360.0 / yearabs)
#define ROT_FACTOR_PLANET (360.0 / 1.0)
#define ROT_FACTOR_MOON (360.0 / dayabs)
@ -72,6 +75,7 @@ static void draw_normals(HE_obj const * const obj,
float const scale_inc);
static void draw_vertices(HE_obj const * const obj,
bool disco);
static float calculateFPS();
static void draw_normals(HE_obj const * const obj,
@ -356,12 +360,40 @@ static void draw_Planet_2(void)
glPopMatrix();
}
/**
* Calculates the frames per second rate.
*
* @return the actual frames per second rate
*/
static float calculateFPS(void)
{
static int frameCount = 0;
static int currentTime = 0;
static int previousTime = 0;
static float fps = 0;
frameCount++;
currentTime = glutGet(GLUT_ELAPSED_TIME);
int timeInterval = currentTime - previousTime;
if (timeInterval > 1000) {
fps = frameCount / (timeInterval / 1000.0f);
previousTime = currentTime;
frameCount = 0;
}
return fps;
}
/**
* Displays the whole setup with the sun, planet one,
* planet two and the frame rate
*/
void display(void)
{
char fps_out[FPS_OUT_SIZE];
char *tmp_ptr = fps_out;
float fps = calculateFPS();
int i;
glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
@ -380,6 +412,11 @@ void display(void)
glColor3f(1.0f, 1.0f, 1.0f);
glRasterPos2i(5, 10);
sprintf(fps_out, "FPS: %f", fps);
for (i = 0; i < FPS_OUT_SIZE; ++i)
glutBitmapCharacter(GLUT_BITMAP_9_BY_15, *tmp_ptr++);
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);