170 lines
3.4 KiB
C
170 lines
3.4 KiB
C
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#define GL_GLEXT_PROTOTYPES
|
|
#include <GL/glut.h>
|
|
#include <unistd.h>
|
|
#include <signal.h>
|
|
|
|
unsigned show_fps = 0;
|
|
unsigned int frame_cnt = 0;
|
|
void alarmhandler(int);
|
|
static const char *filename = NULL;
|
|
|
|
static void usage(char *name)
|
|
{
|
|
fprintf(stderr, "usage: %s [ options ] shader_filename\n", name);
|
|
fprintf(stderr, "\n" );
|
|
fprintf(stderr, "options:\n");
|
|
fprintf(stderr, " -fps show frames per second\n");
|
|
}
|
|
|
|
void alarmhandler (int sig)
|
|
{
|
|
if (sig == SIGALRM) {
|
|
printf("%d frames in 5.0 seconds = %.3f FPS\n", frame_cnt,
|
|
frame_cnt / 5.0);
|
|
|
|
frame_cnt = 0;
|
|
}
|
|
signal(SIGALRM, alarmhandler);
|
|
alarm(5);
|
|
}
|
|
|
|
static void args(int argc, char *argv[])
|
|
{
|
|
GLint i;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
if (strcmp(argv[i], "-fps") == 0) {
|
|
show_fps = 1;
|
|
}
|
|
else if (i == argc - 1) {
|
|
filename = argv[i];
|
|
}
|
|
else {
|
|
usage(argv[0]);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
if (!filename) {
|
|
usage(argv[0]);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
static void Init( void )
|
|
{
|
|
GLint errno;
|
|
GLuint prognum;
|
|
char buf[4096];
|
|
GLuint sz;
|
|
FILE *f;
|
|
|
|
if ((f = fopen(filename, "r")) == NULL) {
|
|
fprintf(stderr, "Couldn't open %s\n", filename);
|
|
exit(1);
|
|
}
|
|
|
|
sz = fread(buf, 1, sizeof(buf), f);
|
|
if (!feof(f)) {
|
|
fprintf(stderr, "file too long\n");
|
|
exit(1);
|
|
}
|
|
fprintf(stderr, "%.*s\n", sz, buf);
|
|
|
|
if (!glutExtensionSupported("GL_ARB_fragment_program")) {
|
|
printf("Error: GL_ARB_fragment_program not supported!\n");
|
|
exit(1);
|
|
}
|
|
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
|
|
|
|
/* Setup the fragment program */
|
|
glGenProgramsARB(1, &prognum);
|
|
glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prognum);
|
|
glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
|
|
sz, (const GLubyte *)buf);
|
|
|
|
errno = glGetError();
|
|
printf("glGetError = 0x%x\n", errno);
|
|
if (errno != GL_NO_ERROR) {
|
|
GLint errorpos;
|
|
|
|
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
|
|
printf("errorpos: %d\n", errorpos);
|
|
printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
|
|
(char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
|
|
}
|
|
glEnable(GL_FRAGMENT_PROGRAM_ARB);
|
|
|
|
glClearColor(.3, .3, .3, 0);
|
|
}
|
|
|
|
static void Reshape(int width, int height)
|
|
{
|
|
|
|
glViewport(0, 0, (GLint)width, (GLint)height);
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
|
|
glMatrixMode(GL_MODELVIEW);
|
|
}
|
|
|
|
static void Key(unsigned char key, int x, int y)
|
|
{
|
|
|
|
switch (key) {
|
|
case 27:
|
|
exit(1);
|
|
default:
|
|
return;
|
|
}
|
|
|
|
glutPostRedisplay();
|
|
}
|
|
|
|
static void Display(void)
|
|
{
|
|
glClear(GL_COLOR_BUFFER_BIT);
|
|
|
|
glBegin(GL_TRIANGLES);
|
|
glColor3f(0,0,1);
|
|
glVertex3f( 0.9, -0.9, -30.0);
|
|
glColor3f(1,0,0);
|
|
glVertex3f( 0.9, 0.9, -30.0);
|
|
glColor3f(0,1,0);
|
|
glVertex3f(-0.9, 0.0, -30.0);
|
|
glEnd();
|
|
|
|
glFlush();
|
|
|
|
if (show_fps) {
|
|
++frame_cnt;
|
|
glutPostRedisplay();
|
|
}
|
|
}
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
glutInit(&argc, argv);
|
|
glutInitWindowPosition(0, 0);
|
|
glutInitWindowSize(250, 250);
|
|
glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH);
|
|
glutCreateWindow(argv[0]);
|
|
glutReshapeFunc(Reshape);
|
|
glutKeyboardFunc(Key);
|
|
glutDisplayFunc(Display);
|
|
args(argc, argv);
|
|
Init();
|
|
if (show_fps) {
|
|
signal(SIGALRM, alarmhandler);
|
|
alarm(5);
|
|
}
|
|
glutMainLoop();
|
|
return 0;
|
|
}
|