nuclear@1: #include <stdio.h>
nuclear@1: #include <stdlib.h>
nuclear@2: #include <assert.h>
nuclear@1: 
nuclear@1: #ifndef __APPLE__
nuclear@1: #include <GL/glut.h>
nuclear@1: #else
nuclear@1: #include <GLUT/glut.h>
nuclear@1: #endif
nuclear@1: 
nuclear@1: #include <vmath.h>
nuclear@2: #include <imago2.h>
nuclear@1: #include "psys.h"
nuclear@1: 
nuclear@8: void cleanup(void);
nuclear@1: void disp(void);
nuclear@1: void idle(void);
nuclear@1: void reshape(int x, int y);
nuclear@1: void keyb(unsigned char key, int x, int y);
nuclear@1: void mouse(int bn, int state, int x, int y);
nuclear@1: void motion(int x, int y);
nuclear@1: vec3_t get_mouse_hit(float x, float y);
nuclear@2: unsigned int load_texture(const char *fname);
nuclear@1: 
nuclear@1: struct psys_emitter *ps;
nuclear@2: unsigned int tex;
nuclear@1: 
nuclear@9: #define RATE	300.0
nuclear@9: 
nuclear@1: int main(int argc, char **argv)
nuclear@1: {
nuclear@1: 	glutInitWindowSize(800, 600);
nuclear@1: 	glutInit(&argc, argv);
nuclear@1: 	glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
nuclear@1: 	glutCreateWindow("libpsys example: simple");
nuclear@1: 
nuclear@1: 	glutDisplayFunc(disp);
nuclear@1: 	glutReshapeFunc(reshape);
nuclear@1: 	glutKeyboardFunc(keyb);
nuclear@1: 	glutMouseFunc(mouse);
nuclear@1: 	glutMotionFunc(motion);
nuclear@1: 	glutIdleFunc(idle);
nuclear@1: 
nuclear@2: 	glClearColor(0.05, 0.05, 0.05, 1);
nuclear@2: 
nuclear@2: 	if(!(tex = load_texture("pimg.png"))) {
nuclear@8: 		fprintf(stderr, "failed to load the texture\n");
nuclear@2: 		return 1;
nuclear@2: 	}
nuclear@1: 
nuclear@1: 	if(!(ps = psys_create())) {
nuclear@1: 		return 1;
nuclear@1: 	}
nuclear@9: 	ps->attr.tex = tex;
nuclear@9: 	ps->attr.drag = 2;
nuclear@9: 	psys_set_value3(&ps->attr.grav, 0, v3_cons(0, -4, 0));
nuclear@8: 	psys_set_anm_rnd(&ps->attr.life, 0, 2, 0);
nuclear@9: 	psys_set_value3(&ps->attr.spawn_range, 0, v3_cons(0.3, 0.3, 0.3));
nuclear@9: 	psys_set_anm_rnd3(&ps->attr.dir, 0, v3_cons(0, 0, 0), v3_cons(4, 4, 4));
nuclear@9: 
nuclear@9: 	psys_set_value3(&ps->attr.part_attr.color, 0, v3_cons(1.0, 0.6, 0.4));
nuclear@9: 	psys_set_value3(&ps->attr.part_attr.color, 1000,  v3_cons(0.6, 0.3, 1.0));
nuclear@9: 	psys_set_value(&ps->attr.part_attr.alpha, 0, 1);
nuclear@9: 	psys_set_value(&ps->attr.part_attr.alpha, 700, 1);
nuclear@9: 	psys_set_value(&ps->attr.part_attr.alpha, 1000, 0);
nuclear@8: 
nuclear@8: 	atexit(cleanup);
nuclear@1: 
nuclear@1: 	glutMainLoop();
nuclear@1: 	return 0;
nuclear@1: }
nuclear@1: 
nuclear@8: void cleanup(void)
nuclear@8: {
nuclear@8: 	psys_free(ps);
nuclear@8: }
nuclear@8: 
nuclear@1: void disp(void)
nuclear@1: {
nuclear@1: 	static unsigned int prev_msec;
nuclear@1: 	unsigned int msec = glutGet(GLUT_ELAPSED_TIME);
nuclear@1: 
nuclear@1: 	glMatrixMode(GL_MODELVIEW);
nuclear@1: 	glLoadIdentity();
nuclear@1: 	glTranslatef(0, 0, -10);
nuclear@1: 
nuclear@1: 	glClear(GL_COLOR_BUFFER_BIT);
nuclear@1: 
nuclear@1: 	psys_update(ps, (msec - prev_msec) / 1000.0);
nuclear@1: 	psys_draw(ps);
nuclear@1: 
nuclear@1: 	glutSwapBuffers();
nuclear@2: 	assert(glGetError() == GL_NO_ERROR);
nuclear@1: }
nuclear@1: 
nuclear@1: void idle(void)
nuclear@1: {
nuclear@1: 	glutPostRedisplay();
nuclear@1: }
nuclear@1: 
nuclear@1: void reshape(int x, int y)
nuclear@1: {
nuclear@1: 	glViewport(0, 0, x, y);
nuclear@1: 
nuclear@1: 	glMatrixMode(GL_PROJECTION);
nuclear@1: 	glLoadIdentity();
nuclear@1: 	gluPerspective(45.0, (float)x / (float)y, 1.0, 1000.0);
nuclear@1: }
nuclear@1: 
nuclear@1: void keyb(unsigned char key, int x, int y)
nuclear@1: {
nuclear@1: 	switch(key) {
nuclear@1: 	case 27:
nuclear@1: 		exit(0);
nuclear@1: 	}
nuclear@1: }
nuclear@1: 
nuclear@1: static int bnstate[32];
nuclear@1: void mouse(int bn, int state, int x, int y)
nuclear@1: {
nuclear@1: 	bnstate[bn - GLUT_LEFT_BUTTON] = state == GLUT_DOWN;
nuclear@1: 	if(bn == GLUT_LEFT_BUTTON) {
nuclear@9: 		psys_set_value(&ps->attr.rate, 0, state == GLUT_DOWN ? RATE : 0.0);
nuclear@1: 		psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1: 	}
nuclear@1: }
nuclear@1: 
nuclear@1: void motion(int x, int y)
nuclear@1: {
nuclear@1: 	if(bnstate[0]) {
nuclear@1: 		psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1: 	}
nuclear@1: }
nuclear@1: 
nuclear@1: vec3_t get_mouse_hit(float x, float y)
nuclear@1: {
nuclear@1: 	double mv[16], proj[16];
nuclear@1: 	int vp[4];
nuclear@1: 	double res_x, res_y, res_z;
nuclear@1: 	float t;
nuclear@1: 	vec3_t res, pnear, pfar;
nuclear@1: 
nuclear@1: 	glGetDoublev(GL_MODELVIEW_MATRIX, mv);
nuclear@1: 	glGetDoublev(GL_PROJECTION_MATRIX, proj);
nuclear@1: 	glGetIntegerv(GL_VIEWPORT, vp);
nuclear@1: 
nuclear@1: 	y = vp[3] - y;
nuclear@1: 
nuclear@1: 	gluUnProject(x, y, 0, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1: 	pnear.x = res_x;
nuclear@1: 	pnear.y = res_y;
nuclear@1: 	pnear.z = res_z;
nuclear@1: 
nuclear@1: 	gluUnProject(x, y, 1, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1: 	pfar.x = res_x;
nuclear@1: 	pfar.y = res_y;
nuclear@1: 	pfar.z = res_z;
nuclear@1: 
nuclear@1: 	t = fabs(pnear.z) / fabs(pfar.z - pnear.z);
nuclear@1: 	res = v3_add(pnear, v3_scale(v3_sub(pfar, pnear), t));
nuclear@1: 
nuclear@1: 	return res;
nuclear@1: }
nuclear@2: 
nuclear@2: unsigned int load_texture(const char *fname)
nuclear@2: {
nuclear@2: 	void *pixels;
nuclear@2: 	int xsz, ysz;
nuclear@2: 	unsigned int tex;
nuclear@2: 
nuclear@2: 	if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
nuclear@2: 		return 0;
nuclear@2: 	}
nuclear@2: 
nuclear@2: 	glGenTextures(1, &tex);
nuclear@2: 	glBindTexture(GL_TEXTURE_2D, tex);
nuclear@2: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@2: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@2: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
nuclear@2: 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
nuclear@2: 	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
nuclear@2: 	img_free_pixels(pixels);
nuclear@2: 
nuclear@2: 	return tex;
nuclear@2: }