X-Git-Url: http://git.subgeniuskitty.com/screensavers/.git/blobdiff_plain/7ce88c8e5a6ac5b1d1ccd2fa90e241b21e76ab44..80cfe219638914799dd0f4aef4a2840c20cf04ee:/hacks/WolframAutomata/WolframAutomata.c diff --git a/hacks/WolframAutomata/WolframAutomata.c b/hacks/WolframAutomata/WolframAutomata.c index 3ccb242..33182e1 100644 --- a/hacks/WolframAutomata/WolframAutomata.c +++ b/hacks/WolframAutomata/WolframAutomata.c @@ -14,18 +14,31 @@ /* TODO: Check manpage for all functions I use and ensure my includes are correct. I don't want to depend on picking up includes via screenhack.h. */ /* TODO: Verify everything in this file is C89. Get rid of things like '//' comments, pack all my declarations upfront, no stdint, etc. */ -/* TODO: Tabs -> Spaces before each commit. */ #include "screenhack.h" // Command line options // directory to output XBM files of each run (and call an external command to convert to PNGs?) +// -save-dir STRING // number of generations to simulate +// -num-generations N // delay time (speed of simulation) +// -delay-usec N // foreground and background color +// ??? (strings of some sort, but I need to look up what X resources to interact with) // display info overlay with CA number and start conditions? +// -overlay // which ruleset number to use? Or random? Or random from small set of hand-selected interesting examples? +// In order of precedence: +// -random (select a random rule on each run) +// -rule N (always simulate Rule N on each run) +// (if neither of the above two are specified, then a random CURATED rule is selected on each run) // which starting population to use? Or random? Or one bit in middle? Or one bit on edge? (For random: Can I allow specifying a density like 25%, 50%, 75%?) +// Options (with precedence): -population STRING (string is a comma separated list of cell IDs to populate, starting from 0) +// -population-curated +// -population-random +// size of pixel square (e.g. 1x1, 2x2, 3x3, etc) +// -pixel-size N struct state { /* Various X resources */ @@ -35,17 +48,36 @@ struct state { // TODO: Explain that this holds the whole evolution of the CA and the actual displayed visualization is simply a snapshot into this pixmap. Pixmap evolution_history; - size_t num_generations; // TODO: Explain all of these. - int delay_microsec; // per generation unsigned long fg, bg; int xlim, ylim, ypos; // explain roughly how and where we use these. Note: I'm not thrilled xlim/ylim since they are actually the width of the display, not the limit of the index (off by one). Change those names. Bool display_info; - // TODO: Add an option for 'pixel size', so the user can define 1x1 or 2x2 or 3x3 or ... pixels. But then I need to deal with leftover pixels. Bool * current_generation; - uint8_t ruleset; + + // TODO: Describe these. + uint8_t rule_number; // Note: This is not a CLI option. You're thinking of rule_requested. + uint8_t rule_requested; // Note: Repurposing Rule 0 as a null value. + Bool rule_random; + + /* Misc Commandline Options */ + int pixel_size; /* Size of CA cell in pixels (e.g. pixel_size=3 means 3x3 pixels per cell). */ + int delay_microsec; /* Requested delay to screenhack framework before next call to WolframAutomata_draw(). */ + int num_generations; /* Number of generations of the CA to simulate before restarting. */ + + /* Expository Variables - Not strictly necessary, but makes some code easier to read. */ + size_t number_of_cells; +}; + +// TODO: Check the full set of 256 CAs for visually interesting examples. +static const uint8_t curated_rule_list[] = { + 22, + 30, + 45, + 57, + 73, + 86 }; static void * @@ -67,24 +99,58 @@ WolframAutomata_init(Display * dpy, Window win) state->bg = gcv.background = get_pixel_resource(state->dpy, xgwa.colormap, "background", "Background"); state->gc = XCreateGC(state->dpy, state->win, GCForeground, &gcv); - state->delay_microsec = get_integer_resource(state->dpy, "delay", "Integer"); + state->delay_microsec = get_integer_resource(state->dpy, "delay-usec", "Integer"); if (state->delay_microsec < 0) state->delay_microsec = 0; + state->pixel_size = get_integer_resource(state->dpy, "pixel-size", "Integer"); + if (state->pixel_size < 1) state->pixel_size = 1; + if (state->pixel_size > state->xlim) state->pixel_size = state->xlim; + + state->number_of_cells = state->xlim / state->pixel_size; + + /* The minimum number of generations is 2 since we must allocate enough */ + /* space to hold the seed generation and at least one pass through */ + /* WolframAutomata_draw(), which is where we check whether or not we've */ + /* reached the end of the pixmap. */ + state->num_generations = get_integer_resource(state->dpy, "num-generations", "Integer"); + if (state->num_generations < 0) state->num_generations = 2; + + /* Time to figure out which rule to use for this simulation. */ + /* We ignore any weirdness resulting from the following cast since every */ + /* bit pattern is also a valid rule; if the user provides weird input, */ + /* then we'll return weird (but well-defined!) output. */ + state->rule_requested = (uint8_t) get_integer_resource(state->dpy, "rule-requested", "Integer"); + state->rule_random = get_boolean_resource(state->dpy, "rule-random", "Boolean"); + /* Through the following set of branches, we enforce CLI flag precedence. */ + if (state->rule_random) { + /* If this flag is set, the user wants truly random rules rather than */ + /* random rules from a curated list. */ + state->rule_number = (uint8_t) random(); + } else if (state->rule_requested != 0) { + /* Rule 0 is terribly uninteresting, so we are reusing it as a 'null' */ + /* value and hoping nobody notices. Finding a non-zero value means */ + /* the user requested a specific rule. Use it. */ + state->rule_number = state->rule_requested; + } else { + /* No command-line options were specified, so select rules randomly */ + /* from a curated list. */ + size_t number_of_array_elements = sizeof(curated_rule_list)/sizeof(curated_rule_list[0]); + state->rule_number = curated_rule_list[random() % number_of_array_elements]; + } + // TODO: These should be command-line options, but I need to learn how the get_integer_resource() and similar functions work first. state->display_info = True; - state->ruleset = 30; - state->num_generations = 10000; // TODO: Enforce that this is >1 in order to hold the seed generation and at least one pass through WolframAutomata_draw(), which is where we check for a full pixmap. - state->current_generation = calloc(1, (sizeof(*(state->current_generation))*(state->xlim))); // TODO: Check calloc() call TODO: Can't recall precedence; can I eliminate any parenthesis? + state->current_generation = calloc(1, (sizeof(*(state->current_generation))*state->number_of_cells)); // TODO: Check calloc() call TODO: Can't recall precedence; can I eliminate any parenthesis? // TODO: Make the starting state a user-configurable option. At least give the user some options like 'random', 'one-middle', 'one edge', etc. // Ideally accept something like a list of integers representing starting pixels to be "on". - state->current_generation[state->xlim-1] = True; + state->current_generation[0] = True; - state->evolution_history = XCreatePixmap(state->dpy, state->win, state->xlim, state->num_generations, xgwa.depth); + state->evolution_history = XCreatePixmap(state->dpy, state->win, state->xlim, state->num_generations*state->pixel_size, xgwa.depth); // Pixmap contents are undefined after creation. Explicitly set a black // background by drawing a black rectangle over the entire pixmap. XSetForeground(state->dpy, state->gc, state->bg); - XFillRectangle(state->dpy, state->evolution_history, state->gc, 0, 0, state->xlim, state->num_generations); + XFillRectangle(state->dpy, state->evolution_history, state->gc, 0, 0, state->xlim, state->num_generations*state->pixel_size); XSetForeground(state->dpy, state->gc, state->fg); // TODO: Need to draw starting generation on pixmap and increment state->ypos. @@ -97,10 +163,10 @@ size_t sindex(struct state * state, int index) { while (index < 0) { - index += state->xlim; + index += state->number_of_cells; } - while (index >= state->xlim) { - index -= state->xlim; + while (index >= state->number_of_cells) { + index -= state->number_of_cells; } return (size_t) index; } @@ -118,7 +184,7 @@ calculate_cell(struct state * state, int cell_id) cell_pattern |= 1; } } - if ((state->ruleset >> cell_pattern) & 1) { + if ((state->rule_number >> cell_pattern) & 1) { return True; } else { return False; @@ -130,9 +196,9 @@ void render_current_generation(struct state * state) { size_t xpos; - for (xpos = 0; xpos < state->xlim; xpos++) { + for (xpos = 0; xpos < state->number_of_cells; xpos++) { if (state->current_generation[xpos] == True) { - XFillRectangle(state->dpy, state->evolution_history, state->gc, xpos, state->ypos, 1, 1); + XFillRectangle(state->dpy, state->evolution_history, state->gc, xpos*state->pixel_size, state->ypos, state->pixel_size, state->pixel_size); } } } @@ -153,10 +219,10 @@ WolframAutomata_draw(Display * dpy, Window win, void * closure) int window_y_offset; Bool new_generation[state->xlim]; - for (xpos = 0; xpos < state->xlim; xpos++) { + for (xpos = 0; xpos < state->number_of_cells; xpos++) { new_generation[xpos] = calculate_cell(state, xpos); } - for (xpos = 0; xpos < state->xlim; xpos++) { + for (xpos = 0; xpos < state->number_of_cells; xpos++) { state->current_generation[xpos] = new_generation[xpos]; } render_current_generation(state); @@ -164,11 +230,12 @@ WolframAutomata_draw(Display * dpy, Window win, void * closure) // Was this the final generation of this particular simulation? If so, give // the user a moment to bask in the glory of our output and then start a // new simulation. - if (state->ypos < state->num_generations-1) { - state->ypos++; + if (state->ypos/state->pixel_size < state->num_generations-1) { + state->ypos += state->pixel_size; } else { // TODO: Wait for a second or two, clear the screen and do a new iteration with suitably changed settings. // Note: Since we can't actually loop or sleep here, we need to add a flag to the state struct to indicate that we're in an 'admiration timewindow' (and indicate when it should end) + printf("infinite hamster wheel\n"); while (1) continue; } @@ -188,15 +255,26 @@ WolframAutomata_draw(Display * dpy, Window win, void * closure) return state->delay_microsec; } +// TODO: Fix formatting static const char * WolframAutomata_defaults[] = { ".background: black", ".foreground: white", - "*delay: 2500", + "*delay-usec: 25000", + // TODO: Difference between dot and asterisk? Presumably the asterisk matches all resouces of attribute "pixelsize"? Apply answer to all new options. + "*pixel-size: 2", + "*num-generations: 5000", + "*rule-requested: 0", + "*rule-random: False", 0 }; +// TODO: Fix formatting static XrmOptionDescRec WolframAutomata_options[] = { - { "-delay", ".delay", XrmoptionSepArg, 0 }, + { "-delay-usec", ".delay-usec", XrmoptionSepArg, 0 }, + { "-pixel-size", ".pixel-size", XrmoptionSepArg, 0 }, + { "-num-generations", ".num-generations", XrmoptionSepArg, 0 }, + { "-rule", ".rule-requested", XrmoptionSepArg, 0 }, + { "-rule-random", ".rule-random", XrmoptionNoArg, "True" }, { 0, 0, 0, 0 } }; @@ -220,7 +298,7 @@ static void WolframAutomata_reshape(Display * dpy, Window win, void * closure, unsigned int w, unsigned int h) { WolframAutomata_free(dpy, win, closure); - WolframAutomata_init(dpy, win); + closure = WolframAutomata_init(dpy, win); } XSCREENSAVER_MODULE ("1D Nearest-Neighbor Cellular Automata", WolframAutomata)