goat3dgfx

annotate examples/cubemap/src/main.cc @ 34:3eb6c8f89fe1

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author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Mar 2014 17:41:10 +0200
parents 25b911c7c35c
children
rev   line source
nuclear@9 1 #include <stdio.h>
nuclear@9 2 #include <stdlib.h>
nuclear@9 3 #include <algorithm>
nuclear@9 4 #include <goat3dgfx/goat3dgfx.h>
nuclear@9 5 #include <vmath/vmath.h>
nuclear@9 6
nuclear@17 7 using namespace goatgfx;
nuclear@17 8
nuclear@9 9 #define CUBEMAP_FILENAME "data/cubemap2.jpg"
nuclear@9 10
nuclear@9 11 static bool init();
nuclear@9 12 static void cleanup();
nuclear@9 13 static void display();
nuclear@9 14 static void skybox(const TextureCube *cubemap = 0);
nuclear@9 15 static void reshape(int x, int y);
nuclear@9 16 static void keyboard(unsigned char key, int x, int y);
nuclear@9 17 static void mouse(int bn, int st, int x, int y);
nuclear@9 18 static void motion(int x, int y);
nuclear@9 19
nuclear@9 20 static float cam_theta, cam_phi;
nuclear@9 21
nuclear@9 22 static TextureCube *cubemap;
nuclear@9 23 static ShaderProg *sdrsky;
nuclear@9 24
nuclear@9 25 int main(int argc, char **argv)
nuclear@9 26 {
nuclear@9 27 glutInit(&argc, argv);
nuclear@9 28 glutInitWindowSize(800, 600);
nuclear@9 29 glutInitDisplayMode(GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
nuclear@9 30 glutCreateWindow("cubemap");
nuclear@9 31
nuclear@9 32 glutDisplayFunc(display);
nuclear@9 33 glutReshapeFunc(reshape);
nuclear@9 34 glutKeyboardFunc(keyboard);
nuclear@9 35 glutMouseFunc(mouse);
nuclear@9 36 glutMotionFunc(motion);
nuclear@9 37
nuclear@9 38 if(!init()) {
nuclear@9 39 return 1;
nuclear@9 40 }
nuclear@9 41 atexit(cleanup);
nuclear@9 42
nuclear@9 43 glutMainLoop();
nuclear@9 44 return 0;
nuclear@9 45 }
nuclear@9 46
nuclear@9 47 static bool init()
nuclear@9 48 {
nuclear@9 49 glewInit();
nuclear@9 50
nuclear@9 51 glEnable(GL_DEPTH_TEST);
nuclear@9 52 //glEnable(GL_CULL_FACE);
nuclear@9 53
nuclear@9 54 cubemap = new TextureCube;
nuclear@9 55 if(!cubemap->load(CUBEMAP_FILENAME)) {
nuclear@9 56 fatal_log("Failed to load cubemap: %s\n", CUBEMAP_FILENAME);
nuclear@9 57 return false;
nuclear@9 58 }
nuclear@9 59
nuclear@9 60 if(!(sdrsky = get_sdrprog("sdr/sky.v.glsl", "sdr/sky.p.glsl"))) {
nuclear@9 61 fatal_log("failed to load skybox shader\n");
nuclear@9 62 return false;
nuclear@9 63 }
nuclear@9 64
nuclear@9 65 return true;
nuclear@9 66 }
nuclear@9 67
nuclear@9 68 static void cleanup()
nuclear@9 69 {
nuclear@9 70 delete cubemap;
nuclear@9 71 }
nuclear@9 72
nuclear@9 73 static void display()
nuclear@9 74 {
nuclear@9 75 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
nuclear@9 76
nuclear@9 77 Matrix4x4 view_matrix;
nuclear@9 78 view_matrix.rotate(Vector3(1, 0, 0), M_PI * cam_phi / 180.0);
nuclear@9 79 view_matrix.rotate(Vector3(0, 1, 0), M_PI * cam_theta / 180.0);
nuclear@9 80 set_view_matrix(view_matrix);
nuclear@9 81
nuclear@9 82 setup_gl_matrices();
nuclear@9 83
nuclear@9 84 skybox(cubemap);
nuclear@9 85
nuclear@9 86 glutSwapBuffers();
nuclear@9 87 CHECKGLERR;
nuclear@9 88 }
nuclear@9 89
nuclear@9 90 static void skybox(const TextureCube *cubemap)
nuclear@9 91 {
nuclear@9 92 static Mesh *skybox;
nuclear@9 93
nuclear@9 94 if(!skybox) {
nuclear@9 95 skybox = new Mesh;
nuclear@9 96 gen_sphere(skybox, 10.0, 12, 6);
nuclear@9 97 }
nuclear@9 98
nuclear@9 99 glPushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT);
nuclear@9 100 glDisable(GL_DEPTH_TEST);
nuclear@9 101 glDisable(GL_CULL_FACE);
nuclear@9 102 glDisable(GL_LIGHTING);
nuclear@9 103
nuclear@9 104 glEnable(GL_TEXTURE_CUBE_MAP);
nuclear@9 105
nuclear@9 106 if(cubemap) cubemap->bind();
nuclear@9 107 sdrsky->bind();
nuclear@9 108
nuclear@9 109 skybox->draw();
nuclear@9 110
nuclear@9 111 glUseProgram(0);
nuclear@9 112 glPopAttrib();
nuclear@9 113 }
nuclear@9 114
nuclear@9 115 static void reshape(int x, int y)
nuclear@9 116 {
nuclear@9 117 glViewport(0, 0, x, y);
nuclear@9 118
nuclear@9 119 Matrix4x4 proj;
nuclear@9 120 proj.set_perspective(M_PI / 4.0, (float)x / (float)y, 0.5, 500.0);
nuclear@9 121 set_projection_matrix(proj);
nuclear@9 122 }
nuclear@9 123
nuclear@9 124 static void keyboard(unsigned char key, int x, int y)
nuclear@9 125 {
nuclear@9 126 switch(key) {
nuclear@9 127 case 27:
nuclear@9 128 exit(0);
nuclear@9 129 }
nuclear@9 130 }
nuclear@9 131
nuclear@9 132 static bool bnstate[16];
nuclear@9 133 static int prev_x, prev_y;
nuclear@9 134
nuclear@9 135 static void mouse(int bn, int st, int x, int y)
nuclear@9 136 {
nuclear@9 137 bnstate[bn - GLUT_LEFT_BUTTON] = st == GLUT_DOWN;
nuclear@9 138 prev_x = x;
nuclear@9 139 prev_y = y;
nuclear@9 140 }
nuclear@9 141
nuclear@9 142 static void motion(int x, int y)
nuclear@9 143 {
nuclear@9 144 int dx = x - prev_x;
nuclear@9 145 int dy = y - prev_y;
nuclear@9 146 prev_x = x;
nuclear@9 147 prev_y = y;
nuclear@9 148
nuclear@9 149 if(!dx && !dy) return;
nuclear@9 150
nuclear@9 151 if(bnstate[0]) {
nuclear@9 152 cam_theta += dx * 0.5;
nuclear@9 153 cam_phi += dy * 0.5;
nuclear@9 154 cam_phi = std::max(-90.0f, std::min(90.0f, cam_phi));
nuclear@9 155 glutPostRedisplay();
nuclear@9 156 }
nuclear@9 157 }