Rendering is working

README.md

@@ -19,4 +19,4 @@ Make sure the program can see the `assets` folder (symbolic links can help).
 ## Dependencies
 
 * SDL2
-
+* SDL2_image

assets/scripts/render.toy

@@ -0,0 +1,17 @@
+import render;
+
+fn onInit(node: opaque) {
+	node.loadTextureRenderNode("assets/sprites/character.png");
+}
+
+fn onStep(node: opaque) {
+	//
+}
+
+fn onFree(node: opaque) {
+	node.freeTextureRenderNode();
+}
+
+fn onDraw(node: opaque) {
+	node.drawRenderNode(50, 50);
+}

assets/scripts/root.toy

@@ -1,5 +1,6 @@
 import standard;
 import engine;
+import render;
 
 fn _makeChild(parent: opaque, fname: string, init: bool) {
 	var child: opaque = loadNode(fname);
@@ -13,21 +14,25 @@ fn _makeChild(parent: opaque, fname: string, init: bool) {
 
 //root node can load the whole scene, and essentially act as the scene object
 fn onInit(node: opaque) {
-	print "root.toy:onInit() called";
+	//print "root.toy:onInit() called";
 
 	//make a child
-	node.makeChild("assets/scripts/child.toy", true); //indicate whether to call "init" on the new node or not
-	node.makeChild("assets/scripts/child.toy", false);
-	node.makeChild("assets/scripts/child.toy", false);
+	//node.makeChild("assets/scripts/child.toy", true); //indicate whether to call "init" on the new node or not
+	//node.makeChild("assets/scripts/child.toy", false);
+	//node.makeChild("assets/scripts/child.toy", false);
 
 	//actually, grab that first node and free it
-	node.freeChildNode(0); //must be done from the parent node, so it's pointer can be nullified
+	//node.freeChildNode(0); //must be done from the parent node, so it's pointer can be nullified
+
+	var r = loadRenderNode("assets/scripts/render.toy");
+
+	node.pushNode(r);
 }
 
 fn onStep(node: opaque) {
-	print clock();
+	//print clock();
 }
 
 fn onFree(node: opaque) {
-	print "root.toy:onFree() called";
+	//print "root.toy:onFree() called";
 }

core/engine.c

@@ -1,6 +1,7 @@
 #include "engine.h"
 
 #include "lib_engine.h"
+#include "lib_render.h"
 #include "lib_standard.h"
 #include "repl_tools.h"
 
@@ -41,6 +42,7 @@ void initEngine() {
 	//init Toy
 	initInterpreter(&engine.interpreter);
 	injectNativeHook(&engine.interpreter, "engine", hookEngine);
+	injectNativeHook(&engine.interpreter, "render", hookRender);
 	injectNativeHook(&engine.interpreter, "standard", hookStandard);
 
 	size_t size = 0;
@@ -146,6 +148,9 @@ void execEngine() {
 		//render the world
 		SDL_SetRenderDrawColor(engine.renderer, 0, 0, 0, 255); //NOTE: This line can be disabled later
 		SDL_RenderClear(engine.renderer); //NOTE: This line can be disabled later
+
+		callEngineNode(engine.rootNode, &engine.interpreter, "onDraw");
+
 		SDL_RenderPresent(engine.renderer);
 	}
 }

core/lib_render.c

@@ -0,0 +1,364 @@
+#include "lib_render.h"
+#include "render_node.h"
+
+#include "engine.h"
+#include "repl_tools.h"
+
+#include "memory.h"
+#include "literal_array.h"
+
+static int nativeLoadRenderNode(Interpreter* interpreter, LiteralArray* arguments) {
+	if (arguments->count != 1) {
+		interpreter->errorOutput("Incorrect number of arguments passed to loadRenderNode\n");
+		return -1;
+	}
+
+	//extract the arguments
+	Literal fname = popLiteralArray(arguments);
+
+	Literal fnameIdn = fname;
+	if (IS_IDENTIFIER(fname) && parseIdentifierToValue(interpreter, &fname)) {
+		freeLiteral(fnameIdn);
+	}
+
+	//check argument types
+	if (!IS_STRING(fname)) {
+		interpreter->errorOutput("Incorrect argument type passed to loadRenderNode\n");
+		freeLiteral(fname);
+		return -1;
+	}
+
+	//load the new node
+	size_t size = 0;
+	char* source = readFile(AS_STRING(fname), &size);
+	unsigned char* tb = compileString(source, &size);
+	free((void*)source);
+
+	RenderNode* node = ALLOCATE(RenderNode, 1);
+
+	//BUGFIX: make an inner-interpreter
+	Interpreter inner;
+
+	//init the inner interpreter manually
+	initLiteralArray(&inner.literalCache);
+	inner.scope = pushScope(NULL);
+	inner.bytecode = tb;
+	inner.length = size;
+	inner.count = 0;
+	inner.codeStart = -1;
+	inner.depth = interpreter->depth + 1;
+	inner.panic = false;
+	initLiteralArray(&inner.stack);
+	inner.exports = interpreter->exports;
+	inner.exportTypes = interpreter->exportTypes;
+	inner.hooks = interpreter->hooks;
+	setInterpreterPrint(&inner, interpreter->printOutput);
+	setInterpreterAssert(&inner, interpreter->assertOutput);
+	setInterpreterError(&inner, interpreter->errorOutput);
+
+	initRenderNode(node, &inner, tb, size);
+
+	//NOTE: initNode() must be called manually
+
+	// return the node
+	Literal nodeLiteral = TO_OPAQUE_LITERAL(node, -1);
+	pushLiteralArray(&interpreter->stack, nodeLiteral);
+
+	//cleanup
+	freeLiteralArray(&inner.stack);
+	freeLiteralArray(&inner.literalCache);
+	freeLiteral(fname);
+	freeLiteral(nodeLiteral);
+
+	return 1;
+}
+
+static int nativeLoadTextureRenderNode(Interpreter* interpreter, LiteralArray* arguments) {
+	if (arguments->count != 2) {
+		interpreter->errorOutput("Incorrect number of arguments passed to loadTextureRenderNode\n");
+		return -1;
+	}
+
+	//extract the arguments
+	Literal fname = popLiteralArray(arguments);
+	Literal nodeLiteral = popLiteralArray(arguments);
+
+	Literal fnameIdn = fname;
+	if (IS_IDENTIFIER(fname) && parseIdentifierToValue(interpreter, &fname)) {
+		freeLiteral(fnameIdn);
+	}
+
+	Literal nodeIdn = nodeLiteral;
+	if (IS_IDENTIFIER(nodeLiteral) && parseIdentifierToValue(interpreter, &nodeLiteral)) {
+		freeLiteral(nodeIdn);
+	}
+
+	//check argument types
+	if (!IS_STRING(fname) || !IS_OPAQUE(nodeLiteral)) {
+		interpreter->errorOutput("Incorrect argument type passed to loadTextureRenderNode\n");
+		freeLiteral(fname);
+		freeLiteral(nodeLiteral);
+		return -1;
+	}
+
+	//actually load TODO: number the opaques, and check the numbers
+	RenderNode* node = (RenderNode*)AS_OPAQUE(nodeLiteral);
+
+	if (node->texture != NULL) {
+		freeTextureRenderNode(node);
+	}
+
+	if (loadTextureRenderNode(node, AS_STRING(fname)) != 0) {
+		interpreter->errorOutput("Failed to load the texture into the RenderNode\n");
+		freeLiteral(fname);
+		freeLiteral(nodeLiteral);
+		return -1;
+	}
+
+	//cleanup
+	freeLiteral(fname);
+	freeLiteral(nodeLiteral);
+	return 0;
+}
+
+static int nativeFreeTextureRenderNode(Interpreter* interpreter, LiteralArray* arguments) {
+	if (arguments->count != 1) {
+		interpreter->errorOutput("Incorrect number of arguments passed to freeTextureRenderNode\n");
+		return -1;
+	}
+
+	//extract the arguments
+	Literal nodeLiteral = popLiteralArray(arguments);
+
+	Literal nodeIdn = nodeLiteral;
+	if (IS_IDENTIFIER(nodeLiteral) && parseIdentifierToValue(interpreter, &nodeLiteral)) {
+		freeLiteral(nodeIdn);
+	}
+
+	//check argument types
+	if (!IS_OPAQUE(nodeLiteral)) {
+		interpreter->errorOutput("Incorrect argument type passed to freeTextureRenderNode\n");
+		freeLiteral(nodeLiteral);
+		return -1;
+	}
+
+	//actually load TODO: number the opaques, and check the numbers
+	RenderNode* node = (RenderNode*)AS_OPAQUE(nodeLiteral);
+
+	if (node->texture != NULL) {
+		freeTextureRenderNode(node);
+	}
+
+	//cleanup
+	freeLiteral(nodeLiteral);
+	return 0;
+}
+
+static int nativeSetRectRenderNode(Interpreter* interpreter, LiteralArray* arguments) {
+	if (arguments->count != 5) {
+		interpreter->errorOutput("Incorrect number of arguments passed to setRectRenderNode\n");
+		return -1;
+	}
+
+	//extract the arguments
+	Literal h = popLiteralArray(arguments);
+	Literal w = popLiteralArray(arguments);
+	Literal y = popLiteralArray(arguments);
+	Literal x = popLiteralArray(arguments);
+	Literal nodeLiteral = popLiteralArray(arguments);
+
+	Literal nodeIdn = nodeLiteral;
+	if (IS_IDENTIFIER(nodeLiteral) && parseIdentifierToValue(interpreter, &nodeLiteral)) {
+		freeLiteral(nodeIdn);
+	}
+
+	Literal xi = x;
+	if (IS_IDENTIFIER(x) && parseIdentifierToValue(interpreter, &x)) {
+		freeLiteral(xi);
+	}
+
+	Literal yi = y;
+	if (IS_IDENTIFIER(y) && parseIdentifierToValue(interpreter, &y)) {
+		freeLiteral(yi);
+	}
+
+	Literal wi = w;
+	if (IS_IDENTIFIER(w) && parseIdentifierToValue(interpreter, &w)) {
+		freeLiteral(wi);
+	}
+
+	Literal hi = h;
+	if (IS_IDENTIFIER(h) && parseIdentifierToValue(interpreter, &h)) {
+		freeLiteral(hi);
+	}
+
+	//check argument types
+	if (!IS_OPAQUE(nodeLiteral) || !IS_INTEGER(x) || !IS_INTEGER(y) || !IS_INTEGER(w) || !IS_INTEGER(h)) {
+		interpreter->errorOutput("Incorrect argument type passed to setRectRenderNode\n");
+		freeLiteral(nodeLiteral);
+		freeLiteral(xi);
+		freeLiteral(yi);
+		freeLiteral(wi);
+		freeLiteral(hi);
+		return -1;
+	}
+
+	//actually set
+	RenderNode* node = (RenderNode*)AS_OPAQUE(nodeLiteral);
+
+	SDL_Rect r = {AS_INTEGER(x), AS_INTEGER(y), AS_INTEGER(w), AS_INTEGER(h)};
+	setRectRenderNode(node, r);
+
+	//cleanup
+	freeLiteral(nodeLiteral);
+	freeLiteral(xi);
+	freeLiteral(yi);
+	freeLiteral(wi);
+	freeLiteral(hi);
+	return 0;
+}
+
+static int nativeDrawRenderNode(Interpreter* interpreter, LiteralArray* arguments) {
+	if (arguments->count != 3 && arguments->count != 5) {
+		interpreter->errorOutput("Incorrect number of arguments passed to drawRenderNode\n");
+		return -1;
+	}
+
+	//extract the arguments
+	Literal w = TO_NULL_LITERAL, h = TO_NULL_LITERAL;
+	if (arguments->count == 5) {
+		h = popLiteralArray(arguments);
+		w = popLiteralArray(arguments);
+	}
+
+	Literal y = popLiteralArray(arguments);
+	Literal x = popLiteralArray(arguments);
+	Literal nodeLiteral = popLiteralArray(arguments);
+
+	Literal nodeIdn = nodeLiteral;
+	if (IS_IDENTIFIER(nodeLiteral) && parseIdentifierToValue(interpreter, &nodeLiteral)) {
+		freeLiteral(nodeIdn);
+	}
+
+	Literal xi = x;
+	if (IS_IDENTIFIER(x) && parseIdentifierToValue(interpreter, &x)) {
+		freeLiteral(xi);
+	}
+
+	Literal yi = y;
+	if (IS_IDENTIFIER(y) && parseIdentifierToValue(interpreter, &y)) {
+		freeLiteral(yi);
+	}
+
+	Literal wi = w;
+	if (IS_IDENTIFIER(w) && parseIdentifierToValue(interpreter, &w)) {
+		freeLiteral(wi);
+	}
+
+	Literal hi = h;
+	if (IS_IDENTIFIER(h) && parseIdentifierToValue(interpreter, &h)) {
+		freeLiteral(hi);
+	}
+
+	//check argument types
+	if (!IS_OPAQUE(nodeLiteral) || !IS_INTEGER(x) || !IS_INTEGER(y) || (!IS_INTEGER(w) && !IS_NULL(w)) || (!IS_INTEGER(h) && !IS_NULL(h))) {
+		interpreter->errorOutput("Incorrect argument type passed to drawRenderNode\n");
+		freeLiteral(nodeLiteral);
+		freeLiteral(xi);
+		freeLiteral(yi);
+		freeLiteral(wi);
+		freeLiteral(hi);
+		return -1;
+	}
+
+	//actually render
+	RenderNode* node = (RenderNode*)AS_OPAQUE(nodeLiteral);
+
+	SDL_Rect r = {AS_INTEGER(x), AS_INTEGER(y), 0, 0};
+	if (IS_INTEGER(w) && IS_INTEGER(h)) {
+		r.w = AS_INTEGER(w);
+		r.h = AS_INTEGER(h);
+	}
+	else {
+		r.w = node->rect.w;
+		r.h = node->rect.h;
+	}
+
+	drawRenderNode(node, r);
+
+	//cleanup
+	freeLiteral(nodeLiteral);
+	freeLiteral(xi);
+	freeLiteral(yi);
+	freeLiteral(wi);
+	freeLiteral(hi);
+	return 0;
+}
+
+//call the hook
+typedef struct Natives {
+	char* name;
+	NativeFn fn;
+} Natives;
+
+int hookRender(Interpreter* interpreter, Literal identifier, Literal alias) {
+	//build the natives list
+	Natives natives[] = {
+		{"loadRenderNode", nativeLoadRenderNode},
+		{"_loadTextureRenderNode", nativeLoadTextureRenderNode},
+		{"_freeTextureRenderNode", nativeFreeTextureRenderNode},
+		{"_setRectRenderNode", nativeSetRectRenderNode},
+		{"_drawRenderNode", nativeDrawRenderNode},
+		{NULL, NULL}
+	};
+
+	//store the library in an aliased dictionary
+	if (!IS_NULL(alias)) {
+		//make sure the name isn't taken
+		if (isDelcaredScopeVariable(interpreter->scope, alias)) {
+			interpreter->errorOutput("Can't override an existing variable\n");
+			freeLiteral(alias);
+			return false;
+		}
+
+		//create the dictionary to load up with functions
+		LiteralDictionary* dictionary = ALLOCATE(LiteralDictionary, 1);
+		initLiteralDictionary(dictionary);
+
+		//load the dict with functions
+		for (int i = 0; natives[i].name; i++) {
+			Literal name = TO_STRING_LITERAL(copyString(natives[i].name, strlen(natives[i].name)), strlen(natives[i].name));
+			Literal func = TO_FUNCTION_LITERAL((void*)natives[i].fn, 0);
+			func.type = LITERAL_FUNCTION_NATIVE;
+
+			setLiteralDictionary(dictionary, name, func);
+
+			freeLiteral(name);
+			freeLiteral(func);
+		}
+
+		//build the type
+		Literal type = TO_TYPE_LITERAL(LITERAL_DICTIONARY, true);
+		Literal strType = TO_TYPE_LITERAL(LITERAL_STRING, true);
+		Literal fnType = TO_TYPE_LITERAL(LITERAL_FUNCTION_NATIVE, true);
+		TYPE_PUSH_SUBTYPE(&type, strType);
+		TYPE_PUSH_SUBTYPE(&type, fnType);
+
+		//set scope
+		Literal dict = TO_DICTIONARY_LITERAL(dictionary);
+		declareScopeVariable(interpreter->scope, alias, type);
+		setScopeVariable(interpreter->scope, alias, dict, false);
+
+		//cleanup
+		freeLiteral(dict);
+		freeLiteral(type);
+		return 0;
+	}
+
+	//default
+	for (int i = 0; natives[i].name; i++) {
+		injectNativeFn(interpreter, natives[i].name, natives[i].fn);
+	}
+
+	return 0;
+}

core/lib_render.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include "interpreter.h"
+
+int hookRender(Interpreter* interpreter, Literal identifier, Literal alias);
+

core/makefile

@@ -2,7 +2,7 @@ CC=gcc
 
 IDIR+=. ../Toy/source
 CFLAGS+=$(addprefix -I,$(IDIR)) -DSDL_MAIN_HANDLED -g -Wall -W -Wno-unused-parameter -Wno-unused-function -Wno-unused-variable
-LIBS+=-lSDL2 -ltoy
+LIBS+=-lSDL2 -lSDL2_image -ltoy
 
 ODIR = obj
 SRC = $(wildcard *.c)

core/render_node.c

@@ -0,0 +1,87 @@
+#include "render_node.h"
+
+#include "engine.h"
+#include "memory.h"
+
+#include <SDL2/SDL_image.h>
+
+static void freeMemory(void* ptr) {
+	RenderNode* node = (RenderNode*)ptr;
+
+	SDL_DestroyTexture(node->texture);
+
+	//free this node type's memory
+	FREE(RenderNode, ptr);
+}
+
+//duplicate the initEngineNode() functionality, plus extra stuff
+void initRenderNode(RenderNode* node, Interpreter* interpreter, void* tb, size_t size) {
+	//init
+	node->freeMemory = freeMemory;
+	node->functions = ALLOCATE(LiteralDictionary, 1);
+	node->children = NULL;
+	node->capacity = 0;
+	node->count = 0;
+
+	node->texture = NULL;
+
+	initLiteralDictionary(node->functions);
+
+	//run bytecode
+	runInterpreter(interpreter, tb, size);
+
+	//grab all top-level function literals
+	LiteralDictionary* variablesPtr = &interpreter->scope->variables;
+
+	for (int i = 0; i < variablesPtr->capacity; i++) {
+		//skip empties and tombstones
+		if (IS_NULL(variablesPtr->entries[i].key)) {
+			continue;
+		}
+
+		//if this variable is a function
+		_entry* entry = &variablesPtr->entries[i];
+		if (IS_FUNCTION(entry->value)) {
+			//save a copy
+			setLiteralDictionary(node->functions, entry->key, entry->value);
+		}
+	}
+}
+
+int loadTextureRenderNode(RenderNode* node, char* fname) {
+	SDL_Surface* surface = IMG_Load(fname);
+
+	if (surface == NULL) {
+		return -1;
+	}
+
+	node->texture = SDL_CreateTextureFromSurface(engine.renderer, surface);
+
+	if (node->texture == NULL) {
+		return -2;
+	}
+
+	SDL_FreeSurface(surface);
+
+	int w, h;
+	SDL_QueryTexture(node->texture, NULL, NULL, &w, &h);
+	SDL_Rect r = { 0, 0, w, h };
+	setRectRenderNode(node, r);
+
+	return 0;
+}
+
+void freeTextureRenderNode(RenderNode* node) {
+	if (node->texture != NULL) {
+		SDL_DestroyTexture(node->texture);
+		node->texture = NULL;
+	}
+}
+
+void setRectRenderNode(RenderNode* node, SDL_Rect rect) {
+	node->rect = rect;
+}
+
+void drawRenderNode(RenderNode* node, SDL_Rect dest) {
+	SDL_RenderCopy(engine.renderer, node->texture, &node->rect, &dest);
+}

core/render_node.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "common.h"
+
+//mimic the engine node
+#include "engine_node.h"
+
+#include <SDL2/SDL.h>
+
+typedef struct _renderNode {
+	//function for releasing memory
+	EngineNodeCallback freeMemory;
+
+	//toy functions, stored in a dict for flexibility
+	LiteralDictionary* functions;
+
+	//use Toy's memory model
+	EngineNode** children;
+	int capacity;
+	int count; //includes tombstones
+
+	//RenderNode-specific features
+	SDL_Texture* texture;
+	SDL_Rect rect;
+	//TODO: depth
+} RenderNode;
+
+CORE_API void initRenderNode(RenderNode* node, Interpreter* interpreter, void* tb, size_t size);
+CORE_API int loadTextureRenderNode(RenderNode* node, char* fname);
+CORE_API void freeTextureRenderNode(RenderNode* node);
+
+CORE_API void setRectRenderNode(RenderNode* node, SDL_Rect rect);
+//TODO: getRectRenderNode
+CORE_API void drawRenderNode(RenderNode* node, SDL_Rect dest);