Renamed files
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243
box/box_engine.c
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243
box/box_engine.c
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#include "engine.h"
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#include "lib_engine.h"
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#include "lib_input.h"
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#include "lib_node.h"
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#include "lib_standard.h"
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#include "lib_timer.h"
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#include "lib_runner.h"
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#include "repl_tools.h"
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#include "memory.h"
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#include "lexer.h"
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#include "parser.h"
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#include "compiler.h"
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#include "interpreter.h"
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#include "literal_array.h"
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#include "literal_dictionary.h"
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#include "console_colors.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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//define the extern engine object
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Engine engine;
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//errors here should be fatal
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static void fatalError(char* message) {
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fprintf(stderr, "%s", message);
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exit(-1);
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}
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//exposed functions
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void initEngine() {
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//clear
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engine.rootNode = NULL;
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engine.running = false;
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engine.window = NULL;
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engine.renderer = NULL;
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//init SDL
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if (SDL_Init(SDL_INIT_VIDEO) != 0) {
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fatalError("Failed to initialize SDL2");
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}
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//init events
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initLiteralArray(&engine.keyDownEvents);
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initLiteralDictionary(&engine.symKeyDownEvents);
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initLiteralArray(&engine.keyUpEvents);
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initLiteralDictionary(&engine.symKeyUpEvents);
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//init Toy
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initInterpreter(&engine.interpreter);
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injectNativeHook(&engine.interpreter, "engine", hookEngine);
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injectNativeHook(&engine.interpreter, "node", hookNode);
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injectNativeHook(&engine.interpreter, "input", hookInput);
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injectNativeHook(&engine.interpreter, "standard", hookStandard);
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injectNativeHook(&engine.interpreter, "timer", hookTimer);
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injectNativeHook(&engine.interpreter, "runner", hookRunner);
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size_t size = 0;
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char* source = readFile("./assets/scripts/init.toy", &size);
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unsigned char* tb = compileString(source, &size);
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free((void*)source);
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runInterpreter(&engine.interpreter, tb, size);
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}
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void freeEngine() {
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//clear existing root node
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if (engine.rootNode != NULL) {
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callRecursiveEngineNode(engine.rootNode, &engine.interpreter, "onFree", NULL);
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freeEngineNode(engine.rootNode);
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engine.rootNode = NULL;
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}
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freeInterpreter(&engine.interpreter);
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//free events
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freeLiteralArray(&engine.keyDownEvents);
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freeLiteralDictionary(&engine.symKeyDownEvents);
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freeLiteralArray(&engine.keyUpEvents);
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freeLiteralDictionary(&engine.symKeyUpEvents);
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//free SDL
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SDL_DestroyRenderer(engine.renderer);
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SDL_DestroyWindow(engine.window);
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SDL_Quit();
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engine.renderer = NULL;
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engine.window = NULL;
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}
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static void execEvents() {
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//clear event lists
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if (engine.keyDownEvents.count > 0) {
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freeLiteralArray(&engine.keyDownEvents);
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//NOTE: this is likely memory intensive - a more bespoke linked list designed for this task would be better
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//NOTE: alternatively - manual memory-wipes, skipping the free step could be better
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}
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if (engine.keyUpEvents.count > 0) {
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freeLiteralArray(&engine.keyUpEvents);
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}
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//poll all events
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SDL_Event event;
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while (SDL_PollEvent(&event)) {
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switch(event.type) {
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//quit
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case SDL_QUIT: {
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engine.running = false;
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}
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break;
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//window events are handled internally
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case SDL_WINDOWEVENT: {
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switch(event.window.event) {
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case SDL_WINDOWEVENT_RESIZED:
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engine.screenWidth = event.window.data1;
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engine.screenHeight = event.window.data2;
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SDL_RenderSetLogicalSize(engine.renderer, engine.screenWidth, engine.screenHeight);
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break;
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}
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}
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break;
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//input
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case SDL_KEYDOWN: {
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//bugfix: ignore repeat messages
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if (event.key.repeat) {
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break;
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}
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//determine the given keycode
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Literal keycodeLiteral = TO_INTEGER_LITERAL( (int)(event.key.keysym.sym) );
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if (!existsLiteralDictionary(&engine.symKeyDownEvents, keycodeLiteral)) {
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break;
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}
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//get the event name
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Literal eventLiteral = getLiteralDictionary(&engine.symKeyDownEvents, keycodeLiteral);
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//push to the event list
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pushLiteralArray(&engine.keyDownEvents, eventLiteral);
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}
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break;
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case SDL_KEYUP: {
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//bugfix: ignore repeat messages
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if (event.key.repeat) {
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break;
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}
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//determine the given keycode
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Literal keycodeLiteral = TO_INTEGER_LITERAL( (int)(event.key.keysym.sym) );
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if (!existsLiteralDictionary(&engine.symKeyUpEvents, keycodeLiteral)) {
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break;
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}
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//get the event name
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Literal eventLiteral = getLiteralDictionary(&engine.symKeyUpEvents, keycodeLiteral);
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//push to the event list
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pushLiteralArray(&engine.keyUpEvents, eventLiteral);
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}
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break;
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}
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}
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//process input events
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if (engine.rootNode != NULL) {
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//key down events
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for (int i = 0; i < engine.keyDownEvents.count; i++) { //TODO: could pass in the whole array?
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LiteralArray args;
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initLiteralArray(&args);
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pushLiteralArray(&args, engine.keyDownEvents.literals[i]);
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callRecursiveEngineNode(engine.rootNode, &engine.interpreter, "onKeyDown", &args);
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freeLiteralArray(&args);
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}
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//key up events
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for (int i = 0; i < engine.keyUpEvents.count; i++) {
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LiteralArray args;
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initLiteralArray(&args);
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pushLiteralArray(&args, engine.keyUpEvents.literals[i]);
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callRecursiveEngineNode(engine.rootNode, &engine.interpreter, "onKeyUp", &args);
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freeLiteralArray(&args);
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}
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}
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}
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void execStep() {
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if (engine.rootNode != NULL) {
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//steps
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callRecursiveEngineNode(engine.rootNode, &engine.interpreter, "onStep", NULL);
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}
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}
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//the heart of the engine
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void execEngine() {
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if (!engine.running) {
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fatalError("Can't execute the engine (did you forget to initialize the screen?)");
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}
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//set up time
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gettimeofday(&engine.realTime, NULL);
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engine.simTime = engine.realTime;
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struct timeval delta = { .tv_sec = 0, .tv_usec = 1000 * 1000 / 60 }; //60 frames per second
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while (engine.running) {
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execEvents();
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//calc the time passed
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gettimeofday(&engine.realTime, NULL);
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//if not enough time has passed
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if (timercmp(&engine.simTime, &engine.realTime, <)) {
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//while not enough time has passed
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while(timercmp(&engine.simTime, &engine.realTime, <)) {
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//simulate the world
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execStep();
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//calc the time simulation
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timeradd(&delta, &engine.simTime, &engine.simTime);
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}
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}
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else {
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SDL_Delay(10); //let the machine sleep, 10ms
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}
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//render the world
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SDL_SetRenderDrawColor(engine.renderer, 0, 0, 0, 255); //NOTE: This line can be disabled later
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SDL_RenderClear(engine.renderer); //NOTE: This line can be disabled later
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callRecursiveEngineNode(engine.rootNode, &engine.interpreter, "onDraw", NULL);
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SDL_RenderPresent(engine.renderer);
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}
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}
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