/* * 3D Engine * mesh.c: * Based on pikuma.com 3D software renderer in C * Copyright (c) 2021 986-Studio. All rights reserved. * * Created by Manoƫl Trapier on 04/03/2021. */ #include #include #include #include #include #include #include #include #include #include #define N_CUBE_VERTICES (8) extern vec3_t cubeVertices[N_CUBE_VERTICES]; #define N_CUBE_FACES (6 * 2) extern face_t cubeFaces[N_CUBE_FACES]; vec3_t cubeVertices[N_CUBE_VERTICES] = { [0] = { .x = -1, .y = -1, .z = -1}, [1] = { .x = -1, .y = 1, .z = -1}, [2] = { .x = 1, .y = 1, .z = -1}, [3] = { .x = 1, .y = -1, .z = -1}, [4] = { .x = 1, .y = 1, .z = 1}, [5] = { .x = 1, .y = -1, .z = 1}, [6] = { .x = -1, .y = 1, .z = 1}, [7] = { .x = -1, .y = -1, .z = 1}, }; face_t cubeFaces[N_CUBE_FACES] = { // front { .a = 1, .b = 2, .c = 3, .a_uv = { 0, 1 }, .b_uv = { 0, 0 }, .c_uv = { 1, 0 }, .colour = 0xFFFFFFFF }, { .a = 1, .b = 3, .c = 4, .a_uv = { 0, 1 }, .b_uv = { 1, 0 }, .c_uv = { 1, 1 }, .colour = 0xFFFFFFFF }, // right { .a = 4, .b = 3, .c = 5, .a_uv = { 0, 1 }, .b_uv = { 0, 0 }, .c_uv = { 1, 0 }, .colour = 0xFFFFFFFF }, { .a = 4, .b = 5, .c = 6, .a_uv = { 0, 1 }, .b_uv = { 1, 0 }, .c_uv = { 1, 1 }, .colour = 0xFFFFFFFF }, // back { .a = 6, .b = 5, .c = 7, .a_uv = { 0, 1 }, .b_uv = { 0, 0 }, .c_uv = { 1, 0 }, .colour = 0xFFFFFFFF }, { .a = 6, .b = 7, .c = 8, .a_uv = { 0, 1 }, .b_uv = { 1, 0 }, .c_uv = { 1, 1 }, .colour = 0xFFFFFFFF }, // left { .a = 8, .b = 7, .c = 2, .a_uv = { 0, 1 }, .b_uv = { 0, 0 }, .c_uv = { 1, 0 }, .colour = 0xFFFFFFFF }, { .a = 8, .b = 2, .c = 1, .a_uv = { 0, 1 }, .b_uv = { 1, 0 }, .c_uv = { 1, 1 }, .colour = 0xFFFFFFFF }, // top { .a = 2, .b = 7, .c = 5, .a_uv = { 0, 1 }, .b_uv = { 0, 0 }, .c_uv = { 1, 0 }, .colour = 0xFFFFFFFF }, { .a = 2, .b = 5, .c = 3, .a_uv = { 0, 1 }, .b_uv = { 1, 0 }, .c_uv = { 1, 1 }, .colour = 0xFFFFFFFF }, // bottom { .a = 6, .b = 8, .c = 1, .a_uv = { 0, 1 }, .b_uv = { 0, 0 }, .c_uv = { 1, 0 }, .colour = 0xFFFFFFFF }, { .a = 6, .b = 1, .c = 4, .a_uv = { 0, 1 }, .b_uv = { 1, 0 }, .c_uv = { 1, 1 }, .colour = 0xFFFFFFFF } }; mesh_t mesh = { .vertices = NULL, .faces = NULL, .rotation = { 0, 0, 0 }, .scale = { 1, 1, 1 }, .translation = { 0, 0, 0 }, }; void loadCubeMeshData() { int i; meshFree(); for(i = 0; i < N_CUBE_VERTICES; i++) { arrayAdd(mesh.vertices, cubeVertices[i]); } for(i = 0; i < N_CUBE_FACES; i++) { arrayAdd(mesh.faces, cubeFaces[i]); } mesh.rotation.x = 0; mesh.rotation.y = 0; mesh.rotation.z = 0; } void meshFree() { arrayEmpty(mesh.normalVertices); arrayEmpty(mesh.textureVertices); arrayFree(mesh.faces); arrayFree(mesh.vertices); } /*********************************************************************************************************************** * OBJ File interpreter based on my project DoRayMe ( https://trac.godzil.net/Godzil/DoRayMe ) **********************************************************************************************************************/ /* Function used to load OBJ files */ static int objFileLoaderParser(const char *content); static void objFileLoaderLineParser(char *line, uint32_t currentLine); static int objFileLoaderExecuteLine(int argc, char *argv[], uint32_t currentLine); static void updateFaceUVValues(); static uint32_t objFileLoaderIgnoredLines = 0; static uint32_t objFileLoaderLoadedVertices = 0; static uint32_t objFileLoaderLoadedVerticesNormal = 0; static uint32_t objFileLoaderLoadedVerticesTexture = 0; static uint32_t objFileLoaderLoadedFaces = 0; static uint32_t objFileLoaderTotalTri = 0; static void updateFaceUVValues() { uint32_t i; uint32_t faceCount = arrayGetSize(mesh.faces); if (arrayGetSize(mesh.textureVertices) > 0) { for (i = 0 ; i < faceCount ; i++) { face_t *face = &mesh.faces[i]; face->a_uv.u = mesh.textureVertices[face->at].u; face->a_uv.v = mesh.textureVertices[face->at].v; face->b_uv.u = mesh.textureVertices[face->bt].u; face->b_uv.v = mesh.textureVertices[face->bt].v; face->c_uv.u = mesh.textureVertices[face->ct].u; face->c_uv.v = mesh.textureVertices[face->ct].v; } } } void loadOBJFile(const char *filepath) { FILE *fp; size_t fileSize; char *fileBuff; fp = fopen(filepath, "rt"); if (fp) { fseek(fp, 0, SEEK_END); fileSize = ftell(fp); /* Add one byte to the size to make sure it is null terminated */ fileBuff = (char *)calloc(fileSize + 1, 1); fseek(fp, 0, SEEK_SET); fileSize = fread(fileBuff, 1, fileSize, fp); fclose(fp); objFileLoaderIgnoredLines = 0; objFileLoaderLoadedVertices = 0; objFileLoaderLoadedVerticesNormal = 0; objFileLoaderLoadedVerticesTexture = 0; objFileLoaderLoadedFaces = 0; objFileLoaderTotalTri = 0; meshFree(); if (objFileLoaderParser(fileBuff)) { Log(TLOG_ERROR, "OBJLoader", "Errors occurred while opening the file '%s'.", filepath); } Log(TLOG_VERBOSE, "OBJLoader", "OBJ File '%s' loaded. Some stats:", filepath); Log(TLOG_VERBOSE, "OBJLoader", "Total ignored lines : %lu", objFileLoaderIgnoredLines); Log(TLOG_VERBOSE, "OBJLoader", "Number of vertices : %lu", objFileLoaderLoadedVertices); Log(TLOG_VERBOSE, "OBJLoader", "Number of normal vertices : %lu", objFileLoaderLoadedVerticesNormal); Log(TLOG_VERBOSE, "OBJLoader", "Number of texture vertices : %lu", objFileLoaderLoadedVerticesTexture); Log(TLOG_VERBOSE, "OBJLoader", "Number of faces in file : %lu", objFileLoaderLoadedFaces); Log(TLOG_VERBOSE, "OBJLoader", "Number of created triangles : %lu", objFileLoaderTotalTri); free(fileBuff); updateFaceUVValues(); } else { Log(TLOG_ERROR, "OBJLoader", "Can't open/find the file '%s'.", filepath); } } #define MAX_LINE_LENGTH (512) /* Here start the fun! */ static int objFileLoaderParser(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; uint32_t totalLength = strlen(content); /* 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 == NULL) { /* We are on the last line */ lineLength = strlen(bufferPos); } else { lineLength = (lineNewline - bufferPos); } if (lineLength >= MAX_LINE_LENGTH) { Log(TLOG_ERROR, "OBJLoader", "Line %d is too long! (%d)", currentLineNum, lineLength); return -1; } memset(lineBuff, 0, MAX_LINE_LENGTH); strncpy(lineBuff, bufferPos, lineLength); objFileLoaderLineParser(lineBuff, currentLineNum); bufferPos += lineLength + 1; if ((bufferPos - content) >= totalLength) { /* We are past the length of the buffer, don't need to continue */ break; } currentLineNum++; } return 0; } #define MAX_ARGS (15) /* Parse the line into a couple ofr argc/argv using space as argument separator */ static void objFileLoaderLineParser(char *line, uint32_t currentLine) { char *argv[MAX_ARGS]; uint32_t argc = 0; char *buffer = line; uint32_t lineLength = strlen(line); uint32_t linePos = 0; /* First argument */ argv[argc++] = line; while(linePos < lineLength) { char *next = strchr(buffer, ' '); if (next != NULL) { *next = '\0'; linePos = next - line; buffer = next + 1; /* Skip empty strings as it mean multiple spaces */ if (strlen(buffer) > 0) { argv[argc++] = buffer; } } else { linePos = lineLength; } } if (objFileLoaderExecuteLine(argc, argv, currentLine)) { objFileLoaderIgnoredLines++; } } static int objFileLoaderParseFaceVertex(char *buf, uint32_t *v, uint32_t *vt, uint32_t *vn) { uint32_t bufPos = 0; uint32_t lineLength = strlen(buf); *vt = INT32_MAX; *vn = INT32_MAX; int ret = 0; int token = 0; while (bufPos < lineLength) { char *next = strchr(buf, '/'); if (next != NULL) { *next = '\0'; bufPos = next - buf; } else { bufPos = lineLength; } if (strlen(buf) > 0) { switch (token) { case 0: *v = atol(buf); break; case 1: *vt = atol(buf); break; case 2: *vn = atol(buf); break; default: Log(TLOG_ERROR, "OBJLoader", "Too many entry for a face vertex!"); ret = 1; break; } } buf = next + 1; token++; } return ret; } /* Actually execute the line */ int objFileLoaderExecuteLine(int argc, char *argv[], uint32_t currentLine) { int ret = 1; if (strncmp(argv[0], "v", 2) == 0) { /* Vertice entry */ if (argc != 4) { Log(TLOG_ERROR, "OBJLoader", "Malformed file at line %d: Vertices expect 3 parameters!", currentLine); } else { vec3_t vertex = { atof(argv[1]), atof(argv[2]), atof(argv[3]) }; arrayAdd(mesh.vertices, vertex); objFileLoaderLoadedVertices++; ret = 0; } } else if (strncmp(argv[0], "vn", 3) == 0) { /* Vertice Normal entry */ if (argc != 4) { Log(TLOG_ERROR, "OBJLoader", "Malformed file at line %d: Vertices normal expect 3 parameters!", currentLine); } else { vec3_t vertex = { atof(argv[1]), atof(argv[2]), atof(argv[3]) }; arrayAdd(mesh.normalVertices, vertex); objFileLoaderLoadedVerticesNormal++; ret = 0; } } else if (strncmp(argv[0], "vt", 3) == 0) { /* Vertice Normal entry */ if ((argc < 3) || (argc > 4)) { Log(TLOG_ERROR, "OBJLoader", "Malformed file at line %d: Vertices texture expect 2 or 3 parameters!", currentLine); } else { tex2_t vertex = { atof(argv[1]), atof(argv[2]) }; arrayAdd(mesh.textureVertices, vertex); objFileLoaderLoadedVerticesTexture++; ret = 0; } } else if (strncmp(argv[0], "f", 2) == 0) { /* Faces entry */ int i; uint32_t v[MAX_ARGS], vt[MAX_ARGS], vn[MAX_ARGS]; for(i = 1; i < argc; i++) { objFileLoaderParseFaceVertex(argv[i], &v[i], &vt[i], &vn[i]); } if (argc == 4) { objFileLoaderTotalTri++; objFileLoaderLoadedFaces++; face_t face = { .a = v[1] - 1, .b = v[2] - 1, .c = v[3] - 1, .at = vt[1] - 1 , .bt = vt[2] - 1, .ct = vt[3] - 1, .colour = MAKE_RGB(45, 170, 10) }; arrayAdd(mesh.faces, face); ret = 0; } else if (argc > 4) { objFileLoaderLoadedFaces++; /* This is not a triangle, so we need to fan it */ for(i = 2; i < (argc - 1); i++) { face_t face = { .a = v[1] - 1, .b = v[i] - 1, .c = v[i + 1] - 1, .at = vt[1] - 1, .bt = vt[i] - 1, .ct = vt[i + 1] - 1, .colour = MAKE_RGB(45, 170, 10) }; arrayAdd(mesh.faces, face); objFileLoaderTotalTri++; } ret = 0; } else { Log(TLOG_ERROR, "OBJLoader", "Malformed file at line %d: Too few/many parameters!", currentLine); } } /* We ignore groups for now, may use it later. */ #if 0 else if (strncmp(argv[0], "g", 2) == 0) { if (argc == 2) { this->addGroup(new Group(argv[1])); } else { Log(TLOG_ERROR, "OBJLoader", "Malformed file at line %d: Too few/many parameters!", currentLine); } } #endif return ret; }