Add initial prototype.

3-mid/physics/implement/box2d/contrib/testbed/settings.cpp

@@ -0,0 +1,176 @@
+// MIT License
+
+// Copyright (c) 2019 Erin Catto
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#define _CRT_SECURE_NO_WARNINGS
+#include "settings.h"
+#include "sajson/sajson.h"
+#include <stdio.h>
+
+static const char* fileName = "settings.ini";
+
+// Load a file. You must free the character array.
+static bool sReadFile(char*& data, int& size, const char* filename)
+{
+	FILE* file = fopen(filename, "rb");
+	if (file == nullptr)
+	{
+		return false;
+	}
+
+	fseek(file, 0, SEEK_END);
+	size = ftell(file);
+	fseek(file, 0, SEEK_SET);
+
+	if (size == 0)
+	{
+		return false;
+	}
+
+	data = (char*)malloc(size + 1);
+	fread(data, size, 1, file);
+	fclose(file);
+	data[size] = 0;
+
+	return true;
+}
+
+void Settings::Save()
+{
+	FILE* file = fopen(fileName, "w");
+	fprintf(file, "{\n");
+	fprintf(file, "  \"testIndex\": %d,\n", m_testIndex);
+	fprintf(file, "  \"windowWidth\": %d,\n", m_windowWidth);
+	fprintf(file, "  \"windowHeight\": %d,\n", m_windowHeight);
+	fprintf(file, "  \"hertz\": %.9g,\n", m_hertz);
+	fprintf(file, "  \"velocityIterations\": %d,\n", m_velocityIterations);
+	fprintf(file, "  \"positionIterations\": %d,\n", m_positionIterations);
+	fprintf(file, "  \"drawShapes\": %s,\n", m_drawShapes ? "true" : "false");
+	fprintf(file, "  \"drawJoints\": %s,\n", m_drawJoints ? "true" : "false");
+	fprintf(file, "  \"drawAABBs\": %s,\n", m_drawAABBs ? "true" : "false");
+	fprintf(file, "  \"drawContactPoints\": %s,\n", m_drawContactPoints ? "true" : "false");
+	fprintf(file, "  \"drawContactNormals\": %s,\n", m_drawContactNormals ? "true" : "false");
+	fprintf(file, "  \"drawContactImpulse\": %s,\n", m_drawContactImpulse ? "true" : "false");
+	fprintf(file, "  \"drawFrictionImpulse\": %s,\n", m_drawFrictionImpulse ? "true" : "false");
+	fprintf(file, "  \"drawCOMs\": %s,\n", m_drawCOMs ? "true" : "false");
+	fprintf(file, "  \"drawStats\": %s,\n", m_drawStats ? "true" : "false");
+	fprintf(file, "  \"drawProfile\": %s,\n", m_drawProfile ? "true" : "false");
+	fprintf(file, "  \"enableWarmStarting\": %s,\n", m_enableWarmStarting ? "true" : "false");
+	fprintf(file, "  \"enableContinuous\": %s,\n", m_enableContinuous ? "true" : "false");
+	fprintf(file, "  \"enableSubStepping\": %s,\n", m_enableSubStepping ? "true" : "false");
+	fprintf(file, "  \"enableSleep\": %s\n", m_enableSleep ? "true" : "false");
+	fprintf(file, "}\n");
+	fclose(file);
+}
+
+void Settings::Load()
+{
+	char* data = nullptr;
+	int size = 0;
+	bool found = sReadFile(data, size, fileName);
+	if (found ==  false)
+	{
+		return;
+	}
+
+	const sajson::document& document = sajson::parse(sajson::dynamic_allocation(), sajson::mutable_string_view(size, data));
+	if (document.is_valid() == false)
+	{
+		return;
+	}
+
+	sajson::value root = document.get_root();
+	int fieldCount = int(root.get_length());
+	for (int i = 0; i < fieldCount; ++i)
+	{
+		sajson::string fieldName = root.get_object_key(i);
+		sajson::value fieldValue = root.get_object_value(i);
+
+		if (strncmp(fieldName.data(), "testIndex", fieldName.length()) == 0)
+		{
+			if (fieldValue.get_type() == sajson::TYPE_INTEGER)
+			{
+				m_testIndex = fieldValue.get_integer_value();
+			}
+			continue;
+		}
+
+		if (strncmp(fieldName.data(), "windowWidth", fieldName.length()) == 0)
+		{
+			if (fieldValue.get_type() == sajson::TYPE_INTEGER)
+			{
+				m_windowWidth = fieldValue.get_integer_value();
+			}
+			continue;
+		}
+
+		if (strncmp(fieldName.data(), "windowHeight", fieldName.length()) == 0)
+		{
+			if (fieldValue.get_type() == sajson::TYPE_INTEGER)
+			{
+				m_windowHeight = fieldValue.get_integer_value();
+			}
+			continue;
+		}
+
+		if (strncmp(fieldName.data(), "hertz", fieldName.length()) == 0)
+		{
+			if (fieldValue.get_type() == sajson::TYPE_DOUBLE || fieldValue.get_type() == sajson::TYPE_INTEGER)
+			{
+				m_hertz = float(fieldValue.get_number_value());
+			}
+			continue;
+		}
+
+		if (strncmp(fieldName.data(), "velocityIterations", fieldName.length()) == 0)
+		{
+			if (fieldValue.get_type() == sajson::TYPE_INTEGER)
+			{
+				m_velocityIterations = fieldValue.get_integer_value();
+			}
+			continue;
+		}
+
+		if (strncmp(fieldName.data(), "positionIterations", fieldName.length()) == 0)
+		{
+			if (fieldValue.get_type() == sajson::TYPE_INTEGER)
+			{
+				m_positionIterations = fieldValue.get_integer_value();
+			}
+			continue;
+		}
+
+		if (strncmp(fieldName.data(), "drawShapes", fieldName.length()) == 0)
+		{
+			if (fieldValue.get_type() == sajson::TYPE_FALSE)
+			{
+				m_drawShapes = false;
+			}
+			else if (fieldValue.get_type() == sajson::TYPE_TRUE)
+			{
+				m_drawShapes = true;
+			}
+			continue;
+		}
+	}
+
+	free(data);
+}