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+ GNU GENERAL PUBLIC LICENSE
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+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+ The GNU General Public License does not permit incorporating your program
+into proprietary programs. If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <signal.h>
+#include <alloca.h>
+#include <imago2.h>
+#include <drawtext.h>
+#include "opengl.h"
+#include <GL/glut.h>
+#include "erebus.h"
+#include "console.h"
+
+static int init();
+static void cleanup();
+static void begin_frame(long tm);
+static void end_frame();
+static void resize_rtarget(int xsz, int ysz);
+static void update_rect(int x, int y, int xsz, int ysz, float *pixels);
+static void idle();
+static void display();
+static void display_statusbar(const struct erb_render_status *status);
+static void save_image(const char *fname);
+static void reshape(int x, int y);
+static void keyb(unsigned char key, int x, int y);
+static void keyb_up(unsigned char key, int x, int y);
+static void skeyb(int key, int x, int y);
+static void mouse(int bn, int st, int x, int y);
+static void motion(int x, int y);
+static int next_pow2(int x);
+static void sighandler(int s);
+static int parse_args(int argc, char **argv);
+static void con_parse(const char *line, void *cls);
+
+static int win_width, win_height, width, height, rtex_width, rtex_height;
+static unsigned int rtex;
+
+static int opt_samples = -1;
+static int opt_iter = -1;
+static int opt_threads = -1;
+static float opt_imgscale = 2.0f;
+
+static struct erebus *erb;
+static int render_pending;
+static int show_status = 1;
+static unsigned long start_time;
+
+static struct input_file {
+ char *fname;
+ struct input_file *next;
+} *input_files, *input_files_tail;
+
+#define FONTSZ 22
+static struct dtx_font *font;
+
+int main(int argc, char **argv)
+{
+ glutInitWindowSize(1024, 600);
+ glutInit(&argc, argv);
+
+ if(parse_args(argc, argv) == -1) {
+ return 1;
+ }
+
+ glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
+ glutCreateWindow("erebus OpenGL frontend");
+
+ glutDisplayFunc(display);
+ glutReshapeFunc(reshape);
+ glutKeyboardFunc(keyb);
+ glutKeyboardUpFunc(keyb_up);
+ glutSpecialFunc(skeyb);
+ glutMouseFunc(mouse);
+ glutMotionFunc(motion);
+
+ if(init() == -1) {
+ return 1;
+ }
+ atexit(cleanup);
+ signal(SIGINT, sighandler);
+ signal(SIGSEGV, sighandler);
+ signal(SIGILL, sighandler);
+ signal(SIGTERM, sighandler);
+ signal(SIGFPE, sighandler);
+
+ glutMainLoop();
+ return 0;
+}
+
+static int init()
+{
+ struct input_file *infile;
+
+ width = glutGet(GLUT_WINDOW_WIDTH) / opt_imgscale;
+ height = glutGet(GLUT_WINDOW_HEIGHT) / opt_imgscale;
+
+ if(!(font = dtx_open_font_glyphmap("data/serif.glyphmap"))) {
+ fprintf(stderr, "warning: failed to load font!\n");
+ }
+
+ struct dtx_font *confont = dtx_open_font_glyphmap("data/mono.glyphmap");
+ if(confont) {
+ con_set_font(confont, 14);
+ } else {
+ con_set_font(font, FONTSZ);
+ }
+ con_set_command_func(con_parse, 0);
+
+ if(!(erb = erb_init())) {
+ return -1;
+ }
+ erb_setopti(erb, ERB_OPT_WIDTH, width);
+ erb_setopti(erb, ERB_OPT_HEIGHT, height);
+
+ if(opt_samples != -1) {
+ erb_setopti(erb, ERB_OPT_MAX_SAMPLES, opt_samples);
+ }
+ if(opt_iter != -1) {
+ erb_setopti(erb, ERB_OPT_MAX_ITER, opt_iter);
+ }
+ if(opt_threads != -1) {
+ erb_setopti(erb, ERB_OPT_NUM_THREADS, opt_threads);
+ }
+
+ infile = input_files;
+ while(infile) {
+ printf("loading scene file: %s\n", infile->fname);
+ if(erb_load_scene(erb, infile->fname) == -1) {
+ return -1;
+ }
+ infile = infile->next;
+ }
+
+ if(input_files) {
+ begin_frame(0);
+ }
+
+ glEnable(GL_TEXTURE_2D);
+ return 0;
+}
+
+static void cleanup()
+{
+ save_image("final.png");
+ erb_destroy(erb);
+}
+
+static void begin_frame(long tm)
+{
+ printf("rendering frame (t=%ld) ...\n", tm);
+
+ render_pending = 1;
+ glutIdleFunc(idle);
+ erb_begin_frame(erb, 0);
+
+ start_time = glutGet(GLUT_ELAPSED_TIME);
+}
+
+static void end_frame()
+{
+ if(!render_pending) return;
+
+ long full_msec = glutGet(GLUT_ELAPSED_TIME) - start_time;
+ long msec, sec, min, hr, days;
+
+ msec = full_msec;
+ con_printf("done in ");
+ if((sec = msec / 1000) > 0) {
+ msec %= 1000;
+ if((min = sec / 60) > 0) {
+ sec %= 60;
+ if((hr = min / 60) > 0) {
+ min %= 60;
+ if((days = hr / 24) > 0) {
+ hr %= 24;
+ con_printf("%ld days ", days);
+ }
+ con_printf("%ld hours ", hr);
+ }
+ con_printf("%ld min ", min);
+ }
+ con_printf("%ld sec ", sec);
+ }
+ con_printf("%ld ms (%ld total msec)\n", msec, full_msec);
+
+ render_pending = 0;
+ glutIdleFunc(0);
+}
+
+static void resize_rtarget(int xsz, int ysz)
+{
+ static unsigned char *defpix;
+ int i, j;
+ unsigned char *ptr;
+
+ if(render_pending) {
+ erb_end_frame(erb);
+ }
+
+ win_width = xsz;
+ win_height = ysz;
+
+ width = xsz / opt_imgscale;
+ height = ysz / opt_imgscale;
+
+ if(width > rtex_width || height > rtex_height) {
+ rtex_width = next_pow2(width);
+ rtex_height = next_pow2(height);
+
+ printf("resizing framebuffer texture: %dx%d\n", rtex_width, rtex_height);
+
+ if(!rtex) {
+ glGenTextures(1, &rtex);
+ }
+
+ free(defpix);
+ if(!(defpix = malloc(rtex_width * rtex_height * 4))) {
+ fprintf(stderr, "failed to allocate %dx%d framebuffer\n", rtex_width, rtex_height);
+ abort();
+ }
+ ptr = defpix;
+ for(i=0; i<rtex_height; i++) {
+ for(j=0; j<rtex_width; j++) {
+ int chess = ((i >> 4) & 1) == ((j >> 4) & 1) ? 1 : 0;
+ int val = chess ? 64 : 48;
+
+ *ptr++ = val;
+ *ptr++ = val;
+ *ptr++ = val;
+ *ptr++ = 255;
+ }
+ }
+
+ glBindTexture(GL_TEXTURE_2D, rtex);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16F_ARB, rtex_width, rtex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, defpix);
+ }
+
+ if(render_pending) {
+ begin_frame(0);
+ }
+}
+
+static void update_rect(int x, int y, int xsz, int ysz, float *pixels)
+{
+ glBindTexture(GL_TEXTURE_2D, rtex);
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, xsz, ysz, GL_RGBA, GL_FLOAT, pixels);
+}
+
+static void idle()
+{
+ glutPostRedisplay();
+}
+
+static void display()
+{
+ static struct erb_render_status status;
+ float maxu, maxv;
+
+ if(render_pending) {
+ if(erb_render(erb, 64) == 0) {
+ end_frame();
+ }
+ update_rect(0, 0, width, height, erb_get_framebuffer(erb));
+ erb_get_status(erb, &status);
+ }
+
+ maxu = (float)width / (float)rtex_width;
+ maxv = (float)height / (float)rtex_height;
+
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, rtex);
+
+ glBegin(GL_QUADS);
+ glColor4f(1, 1, 1, 1);
+ glTexCoord2f(0, maxv); glVertex2f(-1, -1);
+ glTexCoord2f(maxu, maxv); glVertex2f(1, -1);
+ glTexCoord2f(maxu, 0); glVertex2f(1, 1);
+ glTexCoord2f(0, 0); glVertex2f(-1, 1);
+ glEnd();
+
+ // draw the console
+ con_update();
+ con_draw();
+
+ // draw progress information etc...
+ if(show_status) {
+ display_statusbar(&status);
+ }
+
+ glutSwapBuffers();
+ assert(glGetError() == GL_NO_ERROR);
+}
+
+static void display_statusbar(const struct erb_render_status *status)
+{
+ int show_progress = opt_samples > 0;
+ int bar_height, prog_width;
+
+ if(!font) return;
+ dtx_use_font(font, FONTSZ);
+
+ glDisable(GL_TEXTURE_2D);
+
+ glMatrixMode(GL_PROJECTION);
+ glPushMatrix();
+ glLoadIdentity();
+ glOrtho(0, win_width, 0, win_height, -1, 1);
+
+ glMatrixMode(GL_MODELVIEW);
+ glPushMatrix();
+ glLoadIdentity();
+
+ struct dtx_box bbox;
+ dtx_glyph_box('Q', &bbox);
+
+ // draw progress/status bar
+ bar_height = bbox.height + 4;
+ prog_width = show_progress ? status->progress_percent * win_width / 100 : 0;
+
+ glBegin(GL_QUADS);
+ glColor4f(0, 0, 0, 1);
+ glVertex2f(prog_width, 0);
+ glVertex2f(win_width, 0);
+ glVertex2f(win_width, bar_height);
+ glVertex2f(prog_width, bar_height);
+
+ glColor4f(0.25, 0, 0, 1);
+ glVertex2f(0, 0);
+ glVertex2f(prog_width, 0);
+ glVertex2f(prog_width, bar_height);
+ glVertex2f(0, bar_height);
+ glEnd();
+
+ // draw the text
+ glTranslatef(bbox.x + 2, bbox.y + 2, 0);
+
+ glColor4f(1, 1, 1, 1);
+
+ if(opt_samples > 0) {
+ dtx_printf("samples: %ld / %ld", status->samples, status->max_samples);
+
+ glLoadIdentity();
+ glTranslatef(win_width - dtx_string_width("progress: 100%") - 2, bbox.y + 2, 0);
+ dtx_printf("progress: %ld%%", status->progress_percent);
+ } else {
+ dtx_printf("samples: %ld", status->samples);
+ }
+
+ {
+ // samples/sec display
+ static unsigned long paths_per_sec, prev_msec, prev_paths;
+
+ unsigned long msec = glutGet(GLUT_ELAPSED_TIME) - start_time;
+ unsigned long dt = msec - prev_msec;
+
+ if(dt >= 1500) { // average over 1.5 seconds
+ unsigned long paths = status->samples * width * height;
+ if(prev_msec > 0 && prev_paths <= paths) { // check valid interval (not a restart or whatever)
+ paths_per_sec = 1000 * (paths - prev_paths) / dt;
+ }
+ prev_msec = msec;
+ prev_paths = paths;
+ }
+
+ glLoadIdentity();
+ glTranslatef((win_width - dtx_string_width("paths/s: 999999")) / 2, bbox.y + 2, 0);
+ if(paths_per_sec) {
+ dtx_printf("paths/s: %ld", paths_per_sec);
+ } else {
+ dtx_printf("paths/s: ???");
+ }
+ }
+
+ glPopMatrix();
+ glMatrixMode(GL_PROJECTION);
+ glPopMatrix();
+}
+
+static void save_image(const char *fname)
+{
+ float *fb = erb_get_framebuffer(erb);
+
+ if(img_save_pixels(fname ? fname : "output.png", fb, width, height, IMG_FMT_RGBAF) == -1) {
+ fprintf(stderr, "failed to save image\n");
+ }
+}
+
+static void reshape(int x, int y)
+{
+ glViewport(0, 0, x, y);
+ resize_rtarget(x, y);
+
+ erb_setopti(erb, ERB_OPT_WIDTH, width);
+ erb_setopti(erb, ERB_OPT_HEIGHT, height);
+}
+
+static void keyb(unsigned char key, int x, int y)
+{
+ switch(key) {
+ case 27:
+ if(con_is_visible()) {
+ con_hide();
+ glutPostRedisplay();
+ } else {
+ end_frame();
+ exit(0);
+ }
+ break;
+
+ case ' ':
+ if(!con_is_visible()) {
+ begin_frame(0);
+ } else {
+ con_input_key(' ');
+ glutPostRedisplay();
+ }
+ break;
+
+ case '`':
+ con_set_visible(!con_is_visible());
+ glutPostRedisplay();
+ break;
+
+ case '~':
+ show_status = !show_status;
+ glutPostRedisplay();
+ break;
+
+ default:
+ // otherwise if the console is visible, let them through
+ if(con_is_visible()) {
+ con_input_key(key);
+ glutPostRedisplay();
+ return; // don't pass anything to the erb input handler
+ }
+ }
+
+ /* TODO handle input */
+}
+
+static void keyb_up(unsigned char key, int x, int y)
+{
+ /* TODO handle input */
+}
+
+static void skeyb(int key, int x, int y)
+{
+ if(key == GLUT_KEY_F12) {
+ printf("saving image...\n");
+ save_image(0);
+ return;
+ }
+
+ if(con_is_visible()) {
+ switch(key) {
+ case GLUT_KEY_F8:
+ con_debug();
+ return;
+
+ case GLUT_KEY_LEFT:
+ con_input_key(CON_KEY_LEFT);
+ break;
+ case GLUT_KEY_RIGHT:
+ con_input_key(CON_KEY_RIGHT);
+ break;
+ case GLUT_KEY_UP:
+ con_input_key(CON_KEY_UP);
+ break;
+ case GLUT_KEY_DOWN:
+ con_input_key(CON_KEY_DOWN);
+ break;
+ case GLUT_KEY_HOME:
+ con_input_key(CON_KEY_HOME);
+ break;
+ case GLUT_KEY_END:
+ con_input_key(CON_KEY_END);
+ break;
+ case GLUT_KEY_INSERT:
+ con_input_key(CON_KEY_INS);
+ break;
+ case GLUT_KEY_PAGE_UP:
+ con_input_key(CON_KEY_PGUP);
+ break;
+ case GLUT_KEY_PAGE_DOWN:
+ con_input_key(CON_KEY_PGDOWN);
+ break;
+
+ default:
+ return;
+ }
+ glutPostRedisplay();
+ }
+}
+
+static void mouse(int bn, int st, int x, int y)
+{
+ /* TODO handle input */
+}
+
+static void motion(int x, int y)
+{
+ /* TODO handle input */
+}
+
+static int next_pow2(int x)
+{
+ int res = 2;
+ while(res < x) {
+ res <<= 1;
+ }
+ return res;
+}
+
+static void sighandler(int s)
+{
+ exit(0);
+}
+
+static int parse_args(int argc, char **argv)
+{
+ int i;
+
+ for(i=1; i<argc; i++) {
+ if(argv[i][0] == '-') {
+ if(strcmp(argv[i], "-samples") == 0) {
+ opt_samples = atoi(argv[++i]);
+ if(opt_samples <= 0) {
+ fprintf(stderr, "invalid -samples option: %s\n", argv[i]);
+ return -1;
+ }
+
+ } else if(strcmp(argv[i], "-iter") == 0) {
+ opt_iter = atoi(argv[++i]);
+ if(opt_iter <= 0) {
+ fprintf(stderr, "invalid -iter option: %s\n", argv[i]);
+ return -1;
+ }
+
+ } else if(strcmp(argv[i], "-threads") == 0) {
+ opt_threads = atoi(argv[++i]);
+ if(opt_threads <= 0) {
+ fprintf(stderr, "invalid -threads option: %s\n", argv[i]);
+ return -1;
+ }
+
+ } else if(strcmp(argv[i], "-scale") == 0) {
+ opt_imgscale = atof(argv[++i]);
+ if(opt_imgscale <= 0.0f) {
+ fprintf(stderr, "invalid -scale option: %s\n", argv[i]);
+ return -1;
+ }
+
+ } else {
+ fprintf(stderr, "invalid option: %s\n", argv[i]);
+ return -1;
+ }
+ } else {
+ struct input_file *infile;
+
+ if(!(infile = malloc(sizeof *infile))) {
+ fprintf(stderr, "failed to allocate input file node\n");
+ return -1;
+ }
+ infile->fname = argv[i];
+ infile->next = 0;
+
+ if(input_files_tail) {
+ input_files_tail->next = infile;
+ input_files_tail = infile;
+ } else {
+ input_files = input_files_tail = infile;
+ }
+ }
+ }
+
+ return 0;
+}
+
+static void con_parse(const char *line, void *cls)
+{
+ int len, i;
+ char *buf, *tok;
+ char *args[128];
+ int argc = 0;
+
+ if(!(len = strlen(line))) return;
+
+ buf = alloca(len + 1);
+ memcpy(buf, line, len + 1);
+
+ while((tok = strtok(buf, " \n\r\v\t"))) {
+ buf = 0;
+ args[argc++] = tok;
+ }
+ args[argc] = 0;
+
+ if(!args[0]) return;
+
+ if(strcmp(args[0], "exit") == 0 || strcmp(args[0], "quit") == 0) {
+ exit(0);
+
+ } else if(strcmp(args[0], "clear") == 0) {
+ erb_clear(erb);
+
+ } else if(strcmp(args[0], "stop") == 0) {
+ erb_end_frame(erb);
+
+ } else if(strcmp(args[0], "render") == 0) {
+ long tm = 0;
+ if(args[1]) {
+ char *endp;
+ tm = strtol(args[1], &endp, 10);
+ if(endp == args[1]) {
+ con_printf("the argument to render must be a time value in milliseconds\n");
+ return;
+ }
+ }
+ begin_frame(tm);
+
+ } else if(strcmp(args[0], "samples") == 0) {
+ if(args[1] && (opt_samples = atoi(args[1]))) {
+ erb_setopti(erb, ERB_OPT_MAX_SAMPLES, opt_samples);
+ con_printf("max samples is now %d\n", opt_samples);
+ } else {
+ con_printf("invalid samples command: %s\n", line);
+ }
+
+ } else if(strcmp(args[0], "load") == 0) {
+ for(i=1; i<argc; i++) {
+ if(erb_load_scene(erb, args[i]) == -1) {
+ con_printf("failed to load scene: %s\n", args[1]);
+ } else {
+ begin_frame(0);
+ }
+ }
+
+ /*
+ } else if(strcmp(args[0], "add") == 0) {
+ if(erb_proc_cmd(erb, line + 4) == -1) {
+ con_puts("invalid add command\n");
+ } else {
+ begin_frame(0);
+ }
+ */
+
+ } else if(strcmp(args[0], "help") == 0) {
+ con_printf("Available commands:\n");
+ con_printf("render [anim time] begins rendering a frame with the given time (default: 0)\n");
+ con_printf("stop stops rendering\n");
+ con_printf("samples <count> sets the maximum number of samples per pixel\n");
+ con_printf("iter <count> sets the maximum number of ray bounces\n");
+ con_printf("load <filename> loads a scene file\n");
+ con_printf("add <object command> adds another object to the scene. For valid object commands see test/scene\n");
+
+ } else {
+ con_printf("unrecognized command: %s\n", args[0]);
+ }
+}
projects / erebus / commitdiff