moved from h4570/tyra

2020-10-28 09:16:49 +01:00
commit 68eb496e11
90 changed files with 8066 additions and 0 deletions
@@ -0,0 +1,120 @@
+/*
+# ______       ____   ___
+#   |     \/   ____| |___|    
+#   |     |   |   \  |   |       
+#-----------------------------------------------------------------------
+# Copyright 2020, tyra - https://github.com/h4570/tyra
+# Licenced under Apache License 2.0
+# Sandro Sobczyński <sandro.sobczynski@gmail.com>
+*/
+
+#include "../include/loaders/obj_loader.hpp"
+
+#include "../include/utils/debug.hpp"
+#include <string.h>
+
+// ----
+// Constructors/Destructors
+// ----
+
+ObjLoader::ObjLoader() {}
+
+ObjLoader::~ObjLoader() {}
+
+// ----
+// Methods
+// ----
+
+/** Load, parse .obj file and load data into given MeshSpec */
+void ObjLoader::load(ObjModel *o_result, char *t_filename, float t_scale)
+{
+    FILE *file = fopen(t_filename, "rb");
+    if (file == NULL)
+        PRINT_ERR("Failed to load .obj file!");
+    setObjDataQuantities(file, o_result);
+    o_result->allocateMemory();
+    u32 verticesI = 0, cordsI = 0, normalsI = 0, i = 0, vertexIndex[3], coordIndex[3], normalIndex[3];
+    while (1)
+    {
+        char lineHeader[128]; // read the first word of the line
+        int res = fscanf(file, "%s", lineHeader);
+        if (res != EOF)
+        {
+            if (strcmp(lineHeader, "v") == 0)
+            {
+                Vector3 vector = Vector3();
+                fscanf(file, "%f %f %f\n", &vector.x, &vector.y, &vector.z);
+                o_result->vertices[verticesI++] = vector * t_scale;
+            }
+            else if (strcmp(lineHeader, "vt") == 0)
+            {
+                Vector3 vector = Vector3();
+                fscanf(file, "%f %f\n", &vector.x, &vector.y);
+                o_result->coordinates[cordsI++] = vector;
+            }
+            else if (strcmp(lineHeader, "vn") == 0)
+            {
+                Vector3 vector = Vector3();
+                fscanf(file, "%f %f %f\n", &vector.x, &vector.y, &vector.z);
+                o_result->normals[normalsI++] = vector;
+            }
+            else if (strcmp(lineHeader, "f") == 0)
+            {
+                int matches = fscanf(file, "%d/%d/%d %d/%d/%d %d/%d/%d\n",
+                                     &vertexIndex[0], &coordIndex[0], &normalIndex[0],
+                                     &vertexIndex[1], &coordIndex[1], &normalIndex[1],
+                                     &vertexIndex[2], &coordIndex[2], &normalIndex[2]);
+                if (matches != 9)
+                    PRINT_ERR(".obj can't be read by this simple parser. Try exporting with other options");
+                else
+                {
+                    o_result->verticeFaces[i] = vertexIndex[0] - 1;
+                    o_result->verticeFaces[i + 1] = vertexIndex[1] - 1;
+                    o_result->verticeFaces[i + 2] = vertexIndex[2] - 1;
+
+                    o_result->coordinateFaces[i] = coordIndex[0] - 1;
+                    o_result->coordinateFaces[i + 1] = coordIndex[1] - 1;
+                    o_result->coordinateFaces[i + 2] = coordIndex[2] - 1;
+
+                    o_result->normalFaces[i] = normalIndex[0] - 1;
+                    o_result->normalFaces[i + 1] = normalIndex[1] - 1;
+                    o_result->normalFaces[i + 2] = normalIndex[2] - 1;
+                    i += 3;
+                }
+            }
+        }
+        else
+            break;
+    }
+    fclose(file);
+}
+
+/** Calculate how many vertices(v), coordinates(vt), normals(vn) and faces(f) have .obj file
+ * When done, file read offset is resetted to the begginning of file
+ */
+void ObjLoader::setObjDataQuantities(FILE *t_file, ObjModel *o_result)
+{
+    o_result->verticesCount = 0;
+    o_result->coordinatesCount = 0;
+    o_result->normalsCount = 0;
+    o_result->facesCount = 0;
+    while (1)
+    {
+        char lineHeader[128];
+        int res = fscanf(t_file, "%s", lineHeader);
+        if (res != EOF)
+        {
+            if (strcmp(lineHeader, "v") == 0)
+                o_result->verticesCount += 1;
+            else if (strcmp(lineHeader, "vt") == 0)
+                o_result->coordinatesCount += 1;
+            else if (strcmp(lineHeader, "vn") == 0)
+                o_result->normalsCount += 1;
+            else if (strcmp(lineHeader, "f") == 0)
+                o_result->facesCount += 3;
+        }
+        else
+            break;
+    }
+    fseek(t_file, 0, SEEK_SET);
+}