libpsys

annotate examples/simple/simple.c @ 10:0f83e882fd04

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author John Tsiombikas <nuclear@member.fsf.org>
date Wed, 29 Aug 2012 03:16:58 +0300
parents a10f19674147
children 3871a45a4e4b
rev   line source
nuclear@1 1 #include <stdio.h>
nuclear@1 2 #include <stdlib.h>
nuclear@2 3 #include <assert.h>
nuclear@1 4
nuclear@1 5 #ifndef __APPLE__
nuclear@1 6 #include <GL/glut.h>
nuclear@1 7 #else
nuclear@1 8 #include <GLUT/glut.h>
nuclear@1 9 #endif
nuclear@1 10
nuclear@1 11 #include <vmath.h>
nuclear@2 12 #include <imago2.h>
nuclear@1 13 #include "psys.h"
nuclear@1 14
nuclear@8 15 void cleanup(void);
nuclear@1 16 void disp(void);
nuclear@1 17 void idle(void);
nuclear@1 18 void reshape(int x, int y);
nuclear@1 19 void keyb(unsigned char key, int x, int y);
nuclear@1 20 void mouse(int bn, int state, int x, int y);
nuclear@1 21 void motion(int x, int y);
nuclear@1 22 vec3_t get_mouse_hit(float x, float y);
nuclear@2 23 unsigned int load_texture(const char *fname);
nuclear@1 24
nuclear@1 25 struct psys_emitter *ps;
nuclear@2 26 unsigned int tex;
nuclear@1 27
nuclear@9 28 #define RATE 300.0
nuclear@9 29
nuclear@1 30 int main(int argc, char **argv)
nuclear@1 31 {
nuclear@1 32 glutInitWindowSize(800, 600);
nuclear@1 33 glutInit(&argc, argv);
nuclear@1 34 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
nuclear@1 35 glutCreateWindow("libpsys example: simple");
nuclear@1 36
nuclear@1 37 glutDisplayFunc(disp);
nuclear@1 38 glutReshapeFunc(reshape);
nuclear@1 39 glutKeyboardFunc(keyb);
nuclear@1 40 glutMouseFunc(mouse);
nuclear@1 41 glutMotionFunc(motion);
nuclear@1 42 glutIdleFunc(idle);
nuclear@1 43
nuclear@2 44 glClearColor(0.05, 0.05, 0.05, 1);
nuclear@2 45
nuclear@2 46 if(!(tex = load_texture("pimg.png"))) {
nuclear@8 47 fprintf(stderr, "failed to load the texture\n");
nuclear@2 48 return 1;
nuclear@2 49 }
nuclear@1 50
nuclear@1 51 if(!(ps = psys_create())) {
nuclear@1 52 return 1;
nuclear@1 53 }
nuclear@9 54 ps->attr.tex = tex;
nuclear@9 55 ps->attr.drag = 2;
nuclear@9 56 psys_set_value3(&ps->attr.grav, 0, v3_cons(0, -4, 0));
nuclear@8 57 psys_set_anm_rnd(&ps->attr.life, 0, 2, 0);
nuclear@9 58 psys_set_value3(&ps->attr.spawn_range, 0, v3_cons(0.3, 0.3, 0.3));
nuclear@9 59 psys_set_anm_rnd3(&ps->attr.dir, 0, v3_cons(0, 0, 0), v3_cons(4, 4, 4));
nuclear@9 60
nuclear@9 61 psys_set_value3(&ps->attr.part_attr.color, 0, v3_cons(1.0, 0.6, 0.4));
nuclear@9 62 psys_set_value3(&ps->attr.part_attr.color, 1000, v3_cons(0.6, 0.3, 1.0));
nuclear@9 63 psys_set_value(&ps->attr.part_attr.alpha, 0, 1);
nuclear@9 64 psys_set_value(&ps->attr.part_attr.alpha, 700, 1);
nuclear@9 65 psys_set_value(&ps->attr.part_attr.alpha, 1000, 0);
nuclear@8 66
nuclear@8 67 atexit(cleanup);
nuclear@1 68
nuclear@1 69 glutMainLoop();
nuclear@1 70 return 0;
nuclear@1 71 }
nuclear@1 72
nuclear@8 73 void cleanup(void)
nuclear@8 74 {
nuclear@8 75 psys_free(ps);
nuclear@8 76 }
nuclear@8 77
nuclear@1 78 void disp(void)
nuclear@1 79 {
nuclear@1 80 static unsigned int prev_msec;
nuclear@1 81 unsigned int msec = glutGet(GLUT_ELAPSED_TIME);
nuclear@1 82
nuclear@1 83 glMatrixMode(GL_MODELVIEW);
nuclear@1 84 glLoadIdentity();
nuclear@1 85 glTranslatef(0, 0, -10);
nuclear@1 86
nuclear@1 87 glClear(GL_COLOR_BUFFER_BIT);
nuclear@1 88
nuclear@1 89 psys_update(ps, (msec - prev_msec) / 1000.0);
nuclear@1 90 psys_draw(ps);
nuclear@1 91
nuclear@1 92 glutSwapBuffers();
nuclear@2 93 assert(glGetError() == GL_NO_ERROR);
nuclear@1 94 }
nuclear@1 95
nuclear@1 96 void idle(void)
nuclear@1 97 {
nuclear@1 98 glutPostRedisplay();
nuclear@1 99 }
nuclear@1 100
nuclear@1 101 void reshape(int x, int y)
nuclear@1 102 {
nuclear@1 103 glViewport(0, 0, x, y);
nuclear@1 104
nuclear@1 105 glMatrixMode(GL_PROJECTION);
nuclear@1 106 glLoadIdentity();
nuclear@1 107 gluPerspective(45.0, (float)x / (float)y, 1.0, 1000.0);
nuclear@1 108 }
nuclear@1 109
nuclear@1 110 void keyb(unsigned char key, int x, int y)
nuclear@1 111 {
nuclear@1 112 switch(key) {
nuclear@1 113 case 27:
nuclear@1 114 exit(0);
nuclear@1 115 }
nuclear@1 116 }
nuclear@1 117
nuclear@1 118 static int bnstate[32];
nuclear@1 119 void mouse(int bn, int state, int x, int y)
nuclear@1 120 {
nuclear@1 121 bnstate[bn - GLUT_LEFT_BUTTON] = state == GLUT_DOWN;
nuclear@1 122 if(bn == GLUT_LEFT_BUTTON) {
nuclear@9 123 psys_set_value(&ps->attr.rate, 0, state == GLUT_DOWN ? RATE : 0.0);
nuclear@1 124 psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1 125 }
nuclear@1 126 }
nuclear@1 127
nuclear@1 128 void motion(int x, int y)
nuclear@1 129 {
nuclear@1 130 if(bnstate[0]) {
nuclear@1 131 psys_set_pos(ps, get_mouse_hit(x, y), 0);
nuclear@1 132 }
nuclear@1 133 }
nuclear@1 134
nuclear@1 135 vec3_t get_mouse_hit(float x, float y)
nuclear@1 136 {
nuclear@1 137 double mv[16], proj[16];
nuclear@1 138 int vp[4];
nuclear@1 139 double res_x, res_y, res_z;
nuclear@1 140 float t;
nuclear@1 141 vec3_t res, pnear, pfar;
nuclear@1 142
nuclear@1 143 glGetDoublev(GL_MODELVIEW_MATRIX, mv);
nuclear@1 144 glGetDoublev(GL_PROJECTION_MATRIX, proj);
nuclear@1 145 glGetIntegerv(GL_VIEWPORT, vp);
nuclear@1 146
nuclear@1 147 y = vp[3] - y;
nuclear@1 148
nuclear@1 149 gluUnProject(x, y, 0, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1 150 pnear.x = res_x;
nuclear@1 151 pnear.y = res_y;
nuclear@1 152 pnear.z = res_z;
nuclear@1 153
nuclear@1 154 gluUnProject(x, y, 1, mv, proj, vp, &res_x, &res_y, &res_z);
nuclear@1 155 pfar.x = res_x;
nuclear@1 156 pfar.y = res_y;
nuclear@1 157 pfar.z = res_z;
nuclear@1 158
nuclear@1 159 t = fabs(pnear.z) / fabs(pfar.z - pnear.z);
nuclear@1 160 res = v3_add(pnear, v3_scale(v3_sub(pfar, pnear), t));
nuclear@1 161
nuclear@1 162 return res;
nuclear@1 163 }
nuclear@2 164
nuclear@2 165 unsigned int load_texture(const char *fname)
nuclear@2 166 {
nuclear@2 167 void *pixels;
nuclear@2 168 int xsz, ysz;
nuclear@2 169 unsigned int tex;
nuclear@2 170
nuclear@2 171 if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
nuclear@2 172 return 0;
nuclear@2 173 }
nuclear@2 174
nuclear@2 175 glGenTextures(1, &tex);
nuclear@2 176 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@2 177 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@2 178 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@2 179 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
nuclear@2 180 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
nuclear@2 181 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
nuclear@2 182 img_free_pixels(pixels);
nuclear@2 183
nuclear@2 184 return tex;
nuclear@2 185 }