Started working on parsing OBJ Files.

Why string manipulation is so tedious in C/++ :(

source/shapes/objfile.cpp

@@ -0,0 +1,145 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  OBJ File implementation
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <tuple.h>
+#include <ray.h>
+#include <shape.h>
+#include <objfile.h>
+#include <math_helper.h>
+#include <group.h>
+
+#define MIN_ALLOC (2)
+#define DEFAULT_GROUP (0)
+
+OBJFile::OBJFile() : Shape(SHAPE_OBJFILE), ignoredLines(0)
+{
+    stats.addOBJFile();
+
+    this->allocatedFaceGroupCount = MIN_ALLOC;
+    this->faceGroupList = (Shape **)calloc(sizeof(Shape *), MIN_ALLOC);
+    this->faceGroupCount = 0;
+
+    this->allocatedVertexCount = MIN_ALLOC;
+    this->vertexList = (Tuple **)calloc(sizeof(Tuple *), MIN_ALLOC);
+    this->vertexCount = 0;
+
+    /* There is always a default group */
+    this->addGroup(new Group());
+};
+
+OBJFile::OBJFile(const char *filepath) : OBJFile()
+{
+    FILE *fp;
+    size_t fileSize;
+    char *fileBuff;
+    fp = fopen(filepath, "rt");
+    if (fp)
+    {
+        fseek(fp, 0, SEEK_END);
+        fileSize = ftell(fp);
+        fileBuff = (char *)calloc(fileSize, 1);
+        fseek(fp, 0, SEEK_SET);
+        fileSize = fread(fileBuff, 1, fileSize, fp);
+        fclose(fp);
+
+        this->parseOBJFile(fileBuff);
+
+        free(fileBuff);
+    }
+    else
+    {
+        printf("ERROR: Can't open/find the file '%s'.\n", filepath);
+    }
+}
+
+void OBJFile::addGroup(Shape *group)
+{
+    if ((this->faceGroupCount + 1) > this->allocatedFaceGroupCount)
+    {
+        this->allocatedFaceGroupCount *= 2;
+        this->faceGroupList = (Shape **)realloc(this->faceGroupList, sizeof(Shape **) * this->allocatedFaceGroupCount);
+    }
+
+    group->parent = this;
+    group->updateTransform();
+
+    this->faceGroupList[this->faceGroupCount++] = group;
+
+    this->bounds | group->getBounds();
+}
+
+void OBJFile::addVertex(Tuple *vertex)
+{
+    if ((this->vertexCount + 1) > this->allocatedVertexCount)
+    {
+        this->allocatedVertexCount *= 2;
+        this->vertexList = (Tuple **)realloc(this->vertexList, sizeof(Tuple **) * this->allocatedVertexCount);
+    }
+
+    this->vertexList[this->vertexCount++] = vertex;
+}
+
+Intersect OBJFile::localIntersect(Ray r)
+{
+
+}
+
+Tuple OBJFile::localNormalAt(Tuple point)
+{
+
+}
+
+BoundingBox OBJFile::getLocalBounds()
+{
+
+}
+
+#define MAX_LINE_LENGTH (512)
+/* Here start the fun! */
+int OBJFile::parseOBJFile(const char *content)
+{
+    /* I don't think we will handle lines of more than 512 characters... */
+    char lineBuff[MAX_LINE_LENGTH];
+    uint32_t currentLineNum = 1;
+
+    /* Need to process line by line */
+    const char *bufferPos = content;
+    const char *lineNewline;
+    while(*bufferPos != '\0')
+    {
+        uint32_t lineLength;
+        lineNewline = strchr(bufferPos, '\n');
+        if (lineNewline == nullptr)
+        {
+            /* We are on the last line */
+            lineLength = strlen(bufferPos);
+        }
+        else
+        {
+            lineLength = (lineNewline - bufferPos);
+        }
+        if (lineLength >= MAX_LINE_LENGTH)
+        {
+            printf("ERROR: Line %d is too long! (%d)\n", currentLineNum);
+        }
+        memset(lineBuff, 0, MAX_LINE_LENGTH);
+        strncpy(lineBuff, bufferPos, lineLength);
+
+        printf("line %d = %s\n", currentLineNum, lineBuff);
+
+        bufferPos += lineLength + 1;
+        currentLineNum++;
+    }
+
+
+
+}