level.c

   1 #include <GL/gl.h>
   2 #include <assimp/cimport.h>
   3 #include <assimp/postprocess.h>
   4 #include <stdlib.h>
   5
   6 #include "level.h"
   7 #include "logger.h"
   8
   9 static Block blockEmpty = { .type = BLOCKTYPE_SPACE,
  10                             .sceneData = NULL,
  11                             .textureIds = NULL };
  12 static Block blockWall01 = { .type = BLOCKTYPE_OBSTACLE,
  13                              .sceneData = NULL,
  14                              .textureIds = NULL };
  15
  16 static Block* testBlocks[9] = { &blockWall01, &blockWall01, &blockWall01,
  17                                 &blockEmpty, &blockEmpty, &blockEmpty,
  18                                 &blockWall01, &blockEmpty, &blockWall01 };
  19
  20 BlockGrid levelGrid = { .width = 3,
  21                         .depth = 3,
  22                         .blocks = testBlocks };
  23
  24 //static TgaImage* levelImage = NULL;
  25
  26 static const char* replaceFileExtension(const AiString path, const char* ext);
  27
  28 void initLevel() {
  29         const AiScene* sceneData = importScene("out/assets/wall01.3ds");
  30         blockWall01.sceneData = sceneData;
  31         if (sceneData != NULL) {
  32                 const unsigned int numTextures = sceneData->mNumMeshes;
  33
  34                 blockWall01.textureIds = malloc(numTextures * sizeof(GLuint));
  35                 glGenTextures(numTextures, blockWall01.textureIds);
  36
  37                 for (unsigned int i = 0; i < numTextures; ++i) {
  38                         glBindTexture(GL_TEXTURE_2D, blockWall01.textureIds[i]);
  39                         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  40
  41                         AiString originalTexturePath;
  42                         if (aiGetMaterialTexture(sceneData->mMaterials[sceneData->mMeshes[i]->mMaterialIndex],
  43                                                  aiTextureType_DIFFUSE,
  44                                                  0,
  45                                                  &originalTexturePath,
  46                                                  NULL, NULL, NULL, NULL, NULL, NULL) == AI_SUCCESS) {
  47                                 const char* textureFile = replaceFileExtension(originalTexturePath, ".tga");
  48                                 size_t textureFileLength = strlen(textureFile);
  49                                 char* texturePath = malloc(strlen("out/assets/") + textureFileLength + 1);
  50                                 strcpy(texturePath, "out/assets/");
  51                                 strncat(texturePath, textureFile, textureFileLength);
  52                                 TgaImage* textureImage = readTga(texturePath);
  53                                 if (textureImage == NULL) {
  54                                         logError("Asset texture file not found: %s", texturePath);
  55                                 }
  56                                 else {
  57                                         glTexImage2D(GL_TEXTURE_2D,
  58                                                      0,
  59                                                      textureImage->imageComponents,
  60                                                      textureImage->header.imageWidth,
  61                                                      textureImage->header.imageHeight,
  62                                                      0,
  63                                                      textureImage->imageFormat,
  64                                                      GL_UNSIGNED_BYTE,
  65                                                      textureImage->bytes);
  66                                         free(textureImage->bytes);
  67                                 }
  68                         }
  69                 }
  70
  71                 glBindTexture(GL_TEXTURE_2D, 0);
  72         }
  73
  74         buildLevelFromImage(readTga("out/assets/level01.tga"));
  75 }
  76
  77 void buildLevelFromImage(TgaImage* image) {
  78         if (image == NULL) {
  79                 logError("Null image received, cannot build level");
  80                 return;
  81         }
  82
  83         if (image->header.imageBpp != 32) {
  84                 logError("Invalid level image format (%d bpp)", image->header.imageBpp);
  85                 return;
  86         }
  87
  88         BlockGrid newGrid = { .width = image->header.imageWidth,
  89                               .depth = image->header.imageHeight,
  90                               .blocks = malloc(image->header.imageWidth
  91                                                * image->header.imageHeight
  92                                                * sizeof(Block*)) };
  93
  94         for (int z = 0; z < newGrid.depth; ++z) {
  95                 for (int x = 0; x < newGrid.width; ++x) {
  96                         uint32_t pixelColorARGB = ((uint32_t*) image->bytes)[(z * newGrid.width) + x];
  97                         Block* block;
  98                         switch (pixelColorARGB) {
  99                                 case 0xFFFF0000:
 100                                         block = &blockWall01;
 101                                         break;
 102                                 default:
 103                                         block = &blockEmpty;
 104                                         break;
 105                         }
 106                         setBlockInGrid(newGrid, x, z, block);
 107                 }
 108         }
 109
 110         levelGrid = newGrid;
 111 }
 112
 113 const AiScene* importScene(const char* path) {
 114         const AiScene* scene = aiImportFile(path, aiProcess_PreTransformVertices);
 115         if (scene == NULL) {
 116                 logError("Failed to import asset from %s", path);
 117         }
 118         else if ((scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE) == AI_SCENE_FLAGS_INCOMPLETE) {
 119                 logError("Incomplete scene imported from %s", path);
 120                 aiReleaseImport(scene);
 121                 scene = NULL;
 122         }
 123         return scene;
 124         // TODO aiReleaseImport(scene);
 125 }
 126
 127 /** BUGS
 128  * The following function will not work properly with texture
 129  * file names (excluding directory part) beginning with '.'
 130  */
 131 static const char* replaceFileExtension(const AiString path, const char* ext) {
 132                 size_t lengthToCopy = path.length;
 133
 134                 char* lastDotSubstr = strrchr(path.data, '.');
 135                 if (lastDotSubstr != NULL) {
 136                         if (strpbrk(lastDotSubstr, "\\/") == NULL) {
 137                                 lengthToCopy = lastDotSubstr - path.data;
 138                         }
 139                 }
 140
 141                 size_t extLength = strlen(ext) + 1;
 142                 char* newPath = malloc(lengthToCopy + extLength);
 143                 strncpy(newPath, path.data, lengthToCopy);
 144                 strncpy(newPath + lengthToCopy, ext, extLength);
 145
 146                 return newPath;
 147 }