kolibrios/contrib/sdk/samples/Mesa/demos/osgears.c

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/*
* Demo of off-screen Mesa rendering
*
* See Mesa/include/GL/osmesa.h for documentation of the OSMesa functions.
*
* If you want to render BIG images you'll probably have to increase
* MAX_WIDTH and MAX_Height in src/config.h.
*
* This program is in the public domain.
*
* Brian Paul
*
* PPM output provided by Joerg Schmalzl.
* ASCII PPM output added by Brian Paul.
*
* Usage: osdemo [filename]
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <assert.h>
#define GL_GLEXT_PROTOTYPES
#include "GL/osmesa.h"
#include <GL/glext.h>
#include "eglut.h"
#include <kos32sys.h>
void init(void);
void reshape(int width, int height);
void draw(void);
void keyboard(unsigned char key);
extern GLfloat angle;
static void idle(void)
{
static uint32_t t0;
uint32_t t, dt;
t = get_tick_count();
dt = t - t0;
t0 = t;
angle += 70.0 * dt / 100; /* 70 degrees per second */
if (angle > 3600.0)
angle -= 3600.0;
}
static int time_now(void)
{
struct timeval tv;
struct timezone tz;
(void) gettimeofday(&tv, &tz);
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}
int main(int argc, char *argv[])
{
int Width = 384;
int Height = 384;
OSMesaContext ctx;
void *buffer;
char *filename = NULL;
int ev;
int repeat=1;
/* Create an RGBA-mode context */
/* specify Z, stencil, accum sizes */
ctx = OSMesaCreateContextExt( OSMESA_BGRA, 16, 0, 0, NULL );
if (!ctx) {
printf("OSMesaCreateContext failed!\n");
return 0;
}
/* Allocate the image buffer */
buffer = malloc( Width * Height * 4 * sizeof(GLubyte) );
if (!buffer) {
printf("Alloc image buffer failed!\n");
return 0;
}
/* Bind the buffer to the context and make it current */
if (!OSMesaMakeCurrent( ctx, buffer, GL_UNSIGNED_BYTE, Width, Height )) {
printf("OSMesaMakeCurrent failed!\n");
return 0;
}
{
int z, s, a;
glGetIntegerv(GL_DEPTH_BITS, &z);
glGetIntegerv(GL_STENCIL_BITS, &s);
glGetIntegerv(GL_ACCUM_RED_BITS, &a);
printf("Depth=%d Stencil=%d Accum=%d\n", z, s, a);
}
reshape(Width, Height);
glClearColor( 0, 0, 0, 1);
init();
draw();
DrawWindow(10, 10, Width+TYPE_3_BORDER_WIDTH*2, Height+TYPE_3_BORDER_WIDTH+get_skin_height(),
"OpenGL Engine Demo", 0x000000, 0x74);
Blit(buffer, TYPE_3_BORDER_WIDTH, get_skin_height(), 0, 0, Width, Height, Width,Height,Width*4);
int start = time_now();
int frames = 0;
while(repeat)
{
int now = time_now();
oskey_t key;
ev = check_os_event();
switch(ev)
{
case 1:
DrawWindow(0,0,0,0, NULL, 0x000000,0x74);
break;
case 2:
key = get_key();
keyboard(key.code);
break;
case 3:
if(get_os_button()==1)
repeat=0;
continue;
};
if (now - start >= 5000)
{
double elapsed = (double) (now - start) / 1000.0;
printf("%d frames in %3.1f seconds = %6.3f FPS\n",
frames, elapsed, frames / elapsed);
fflush(stdout);
start = now;
frames = 0;
}
idle();
draw();
glFlush();
Blit(buffer, TYPE_3_BORDER_WIDTH, get_skin_height(), 0, 0, Width, Height, Width,Height,Width*4);
frames++;
};
/* free the image buffer */
free( buffer );
/* destroy the context */
OSMesaDestroyContext( ctx );
return 0;
}