erebus

annotate src/main.cc @ 19:6204e4d3f445

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scene loading
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 27 May 2014 07:43:55 +0300
parents 20d6c05529f1
children e49f4d7ad04c
rev   line source
nuclear@2 1 #include <stdio.h>
nuclear@2 2 #include <stdlib.h>
nuclear@2 3 #include <assert.h>
nuclear@19 4 #include <vector>
nuclear@2 5 #include "opengl.h"
nuclear@4 6 #include "erebus.h"
nuclear@2 7
nuclear@2 8 static bool init();
nuclear@2 9 static void cleanup();
nuclear@2 10 static void resize_rtarget(int xsz, int ysz);
nuclear@2 11 static void update_rect(int x, int y, int xsz, int ysz, float *pixels);
nuclear@4 12 static void idle();
nuclear@2 13 static void display();
nuclear@2 14 static void reshape(int x, int y);
nuclear@2 15 static void keyb(unsigned char key, int x, int y);
nuclear@9 16 static void keyb_up(unsigned char key, int x, int y);
nuclear@2 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 static void sball_button(int bn, int st);
nuclear@9 20 static void sball_motion(int x, int y, int z);
nuclear@2 21 static int next_pow2(int x);
nuclear@2 22
nuclear@2 23 static int width, height, rtex_width, rtex_height;
nuclear@2 24 static unsigned int rtex;
nuclear@2 25
nuclear@4 26 static erebus *erb;
nuclear@4 27 static bool render_pending;
nuclear@4 28
nuclear@19 29 static std::vector<char*> sfiles;
nuclear@4 30
nuclear@2 31 int main(int argc, char **argv)
nuclear@2 32 {
nuclear@2 33 glutInitWindowSize(1024, 600);
nuclear@2 34 glutInit(&argc, argv);
nuclear@19 35
nuclear@19 36 for(int i=1; i<argc; i++) {
nuclear@19 37 sfiles.push_back(argv[i]);
nuclear@19 38 }
nuclear@19 39
nuclear@2 40 glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
nuclear@2 41 glutCreateWindow("erebus OpenGL frontend");
nuclear@2 42
nuclear@2 43 glutDisplayFunc(display);
nuclear@2 44 glutReshapeFunc(reshape);
nuclear@2 45 glutKeyboardFunc(keyb);
nuclear@9 46 glutKeyboardUpFunc(keyb_up);
nuclear@2 47 glutMouseFunc(mouse);
nuclear@9 48 glutMotionFunc(motion);
nuclear@9 49 glutSpaceballButtonFunc(sball_button);
nuclear@9 50 glutSpaceballMotionFunc(sball_motion);
nuclear@2 51
nuclear@2 52 if(!init()) {
nuclear@2 53 return 1;
nuclear@2 54 }
nuclear@2 55 atexit(cleanup);
nuclear@2 56
nuclear@2 57 glutMainLoop();
nuclear@2 58 }
nuclear@2 59
nuclear@2 60 static bool init()
nuclear@2 61 {
nuclear@8 62 width = glutGet(GLUT_WINDOW_WIDTH) / 2;
nuclear@8 63 height = glutGet(GLUT_WINDOW_HEIGHT) / 2;
nuclear@5 64
nuclear@4 65 if(!(erb = erb_init())) {
nuclear@4 66 return false;
nuclear@4 67 }
nuclear@4 68 erb_setopti(erb, ERB_OPT_WIDTH, width);
nuclear@4 69 erb_setopti(erb, ERB_OPT_HEIGHT, height);
nuclear@4 70
nuclear@19 71 for(size_t i=0; i<sfiles.size(); i++) {
nuclear@19 72 printf("loading scene file: %s\n", sfiles[i]);
nuclear@19 73 if(erb_load_scene(erb, sfiles[i]) == -1) {
nuclear@19 74 return false;
nuclear@19 75 }
nuclear@4 76 }
nuclear@4 77
nuclear@4 78 printf("begin rendering\n");
nuclear@4 79 render_pending = true;
nuclear@4 80 glutIdleFunc(idle);
nuclear@4 81 erb_begin_frame(erb, 0);
nuclear@4 82
nuclear@8 83 glEnable(GL_TEXTURE_2D);
nuclear@2 84 return true;
nuclear@2 85 }
nuclear@2 86
nuclear@2 87 static void cleanup()
nuclear@2 88 {
nuclear@4 89 erb_destroy(erb);
nuclear@2 90 }
nuclear@2 91
nuclear@2 92 static void resize_rtarget(int xsz, int ysz)
nuclear@2 93 {
nuclear@2 94 static unsigned char *defpix;
nuclear@2 95
nuclear@8 96 width = xsz / 2;
nuclear@8 97 height = ysz / 2;
nuclear@2 98
nuclear@8 99 if(width <= rtex_width && height <= rtex_height) {
nuclear@2 100 return;
nuclear@2 101 }
nuclear@8 102 rtex_width = next_pow2(width);
nuclear@8 103 rtex_height = next_pow2(height);
nuclear@2 104
nuclear@2 105 printf("resizing framebuffer texture: %dx%d\n", rtex_width, rtex_height);
nuclear@2 106
nuclear@2 107 if(!rtex) {
nuclear@2 108 glGenTextures(1, &rtex);
nuclear@2 109 }
nuclear@2 110
nuclear@2 111 delete [] defpix;
nuclear@2 112 defpix = new unsigned char[rtex_width * rtex_height * 4];
nuclear@2 113 unsigned char *ptr = defpix;
nuclear@2 114 for(int i=0; i<rtex_height; i++) {
nuclear@2 115 for(int j=0; j<rtex_width; j++) {
nuclear@2 116 bool chess = ((i >> 4) & 1) == ((j >> 4) & 1);
nuclear@2 117
nuclear@2 118 int val = chess ? 64 : 48;
nuclear@2 119
nuclear@2 120 *ptr++ = val;
nuclear@2 121 *ptr++ = val;
nuclear@2 122 *ptr++ = val;
nuclear@2 123 *ptr++ = 255;
nuclear@2 124 }
nuclear@2 125 }
nuclear@2 126
nuclear@2 127 glBindTexture(GL_TEXTURE_2D, rtex);
nuclear@2 128 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
nuclear@2 129 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
nuclear@2 130 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F_ARB, rtex_width, rtex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, defpix);
nuclear@2 131 }
nuclear@2 132
nuclear@2 133 static void update_rect(int x, int y, int xsz, int ysz, float *pixels)
nuclear@2 134 {
nuclear@2 135 glBindTexture(GL_TEXTURE_2D, rtex);
nuclear@2 136 glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, xsz, ysz, GL_RGBA, GL_FLOAT, pixels);
nuclear@2 137 }
nuclear@2 138
nuclear@4 139 static void idle()
nuclear@4 140 {
nuclear@4 141 glutPostRedisplay();
nuclear@4 142 }
nuclear@4 143
nuclear@2 144 static void display()
nuclear@2 145 {
nuclear@4 146 if(render_pending) {
nuclear@8 147 if(erb_render(erb, 64) == 0) {
nuclear@4 148 render_pending = false;
nuclear@4 149 glutIdleFunc(0);
nuclear@4 150 }
nuclear@4 151 update_rect(0, 0, width, height, erb_get_framebuffer(erb));
nuclear@4 152 }
nuclear@4 153
nuclear@2 154 float maxu = (float)width / (float)rtex_width;
nuclear@2 155 float maxv = (float)height / (float)rtex_height;
nuclear@2 156
nuclear@2 157 glBegin(GL_QUADS);
nuclear@2 158 glTexCoord2f(0, maxv); glVertex2f(-1, -1);
nuclear@2 159 glTexCoord2f(maxu, maxv); glVertex2f(1, -1);
nuclear@2 160 glTexCoord2f(maxu, 0); glVertex2f(1, 1);
nuclear@2 161 glTexCoord2f(0, 0); glVertex2f(-1, 1);
nuclear@2 162 glEnd();
nuclear@2 163
nuclear@2 164 glutSwapBuffers();
nuclear@2 165 assert(glGetError() == GL_NO_ERROR);
nuclear@2 166 }
nuclear@2 167
nuclear@2 168 static void reshape(int x, int y)
nuclear@2 169 {
nuclear@2 170 glViewport(0, 0, x, y);
nuclear@2 171 resize_rtarget(x, y);
nuclear@4 172
nuclear@4 173 erb_setopti(erb, ERB_OPT_WIDTH, width);
nuclear@4 174 erb_setopti(erb, ERB_OPT_HEIGHT, height);
nuclear@2 175 }
nuclear@2 176
nuclear@2 177 static void keyb(unsigned char key, int x, int y)
nuclear@2 178 {
nuclear@2 179 switch(key) {
nuclear@2 180 case 27:
nuclear@2 181 exit(0);
nuclear@4 182
nuclear@4 183 case ' ':
nuclear@4 184 printf("begin rendering\n");
nuclear@4 185 render_pending = true;
nuclear@4 186 glutIdleFunc(idle);
nuclear@4 187 erb_begin_frame(erb, 0);
nuclear@4 188 break;
nuclear@2 189 }
nuclear@9 190
nuclear@10 191 if(erb_input_keyboard(erb, key, true)) {
nuclear@9 192 glutPostRedisplay();
nuclear@9 193 }
nuclear@9 194 }
nuclear@9 195
nuclear@9 196 static void keyb_up(unsigned char key, int x, int y)
nuclear@9 197 {
nuclear@10 198 if(erb_input_keyboard(erb, key, false)) {
nuclear@9 199 glutPostRedisplay();
nuclear@9 200 }
nuclear@2 201 }
nuclear@2 202
nuclear@2 203 static void mouse(int bn, int st, int x, int y)
nuclear@2 204 {
nuclear@10 205 if(erb_input_mouse_button(erb, bn - GLUT_LEFT_BUTTON, st == GLUT_DOWN, x, y)) {
nuclear@9 206 glutPostRedisplay();
nuclear@9 207 }
nuclear@9 208 }
nuclear@9 209
nuclear@9 210 static void motion(int x, int y)
nuclear@9 211 {
nuclear@15 212 if(erb_input_mouse_motion(erb, x, y)) {
nuclear@9 213 glutPostRedisplay();
nuclear@9 214 }
nuclear@9 215 }
nuclear@9 216
nuclear@9 217 static void sball_button(int bn, int state)
nuclear@9 218 {
nuclear@10 219 if(erb_input_6dof_button(erb, bn, state == GLUT_DOWN)) {
nuclear@9 220 glutPostRedisplay();
nuclear@9 221 }
nuclear@9 222 }
nuclear@9 223
nuclear@9 224 static void sball_motion(int x, int y, int z)
nuclear@9 225 {
nuclear@10 226 if(erb_input_6dof_motion(erb, x / 65536.0, y / 65536.0, z / 65536.0)) {
nuclear@9 227 glutPostRedisplay();
nuclear@9 228 }
nuclear@2 229 }
nuclear@2 230
nuclear@2 231 static int next_pow2(int x)
nuclear@2 232 {
nuclear@2 233 int res = 2;
nuclear@2 234 while(res < x) {
nuclear@2 235 res <<= 1;
nuclear@2 236 }
nuclear@2 237 return res;
nuclear@2 238 }