1 files changed, 469 insertions, 0 deletions
diff --git a/apps/graphics/traveler/src/trv_world.c b/apps/graphics/traveler/src/trv_world.c
new file mode 100644
index 000000000..b21379be3
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+++ b/apps/graphics/traveler/src/trv_world.c
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+/*******************************************************************************
+ * apps/graphics/traveler/src/trv_world.c
+ * This file contains the logic that creates and destroys the world.
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included files
+ ****************************************************************************/
+
+#include "trv_types.h"
+#include "trv_paltable.h"
+#include "trv_world.h"
+#include "trv_plane.h"
+#include "trv_bitmaps.h"
+
+#include <stdio.h>
+#include <errno.h>
+#include <apps/inifile.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Everything related to the camera POV is defined in the camera section. */
+
+#define CAMERA_SECTION_NAME    "camera"
+
+/* These values define the initial camera position. */
+
+#define CAMERA_INITIAL_X       "initialcamerax"
+#define CAMERA_INITIAL_Y       "initialcameray"
+#define CAMERA_INITIAL_Z       "initialcameraz"
+
+/* These values define the orientation of the g_camera. */
+
+#define CAMERA_INITIAL_YAW     "initialcamerayaw"
+#define CAMERA_INITIAL_PITCH   "initialcamerayaw"
+
+/* Everything related to the player is defined in the player section. */
+
+#define PLAYER_SECTION_NAME    "player"
+
+/* These are characteristics of the player. */
+
+#define PLAYER_HEIGHT          "playerheight"
+#define PLAYER_WALK_STEPHEIGHT "playerwalkstepheight"
+#define PLAYER_RUN_STEPHEIGHT  "playerrunstepheight"
+
+/* Everything related to the world is defined in the world section. */
+
+#define WORLD_SECTION_NAME     "world"
+
+/* Other files: */
+
+#define WORLD_MAP              "worldmap"
+#define WORLD_PALETTE          "worldpalette"
+#define WORLD_IMAGES           "worldimages"
+
+/****************************************************************************
+ * Private Type Declarations
+ ***************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static int trv_ini_short(INIHANDLE inihandle, FAR int16_t *value,
+                         FAR const char *section, FAR const char *name);
+#if 0 /* Not used */
+static int trv_ini_long(INIHANDLE inihandle, FAR  long *value,
+                        FAR const char *section, FAR const char *name);
+#endif
+static int trv_ini_filename(INIHANDLE inihandle, FAR char **filename,
+                            FAR const char *section, FAR const char *name);
+static int trv_manage_wldfile(INIHANDLE inihandle);
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/* This is the starting position and orientation of the camera in the world */
+
+struct trv_camera_s g_initial_camera;
+
+/* This is the height of player (distance from the camera Z position to
+ * the position of the player's "feet"
+ */
+
+trv_coord_t g_player_height;
+
+/* This is size of something that the player can step over when "walking" */
+
+trv_coord_t g_walk_stepheight;
+
+/* This is size of something that the player can step over when "running" */
+
+trv_coord_t g_run_stepheight;
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const char g_camera_section_name[]        = CAMERA_SECTION_NAME;
+static const char g_camera_initialx_name[]       = CAMERA_INITIAL_X;
+static const char g_camera_initialy_name[]       = CAMERA_INITIAL_Y;
+static const char g_camera_initialz_name[]       = CAMERA_INITIAL_Z;
+static const char g_camera_initialyaw_name[]     = CAMERA_INITIAL_YAW;
+static const char g_camera_initialpitch_name[]   = CAMERA_INITIAL_PITCH;
+
+static const char g_player_section_name[]        = PLAYER_SECTION_NAME;
+static const char g_player_height_name[]         = PLAYER_HEIGHT;
+static const char g_player_walkstepheight_name[] = PLAYER_WALK_STEPHEIGHT;
+static const char g_player_runstepheight_name[]  = PLAYER_RUN_STEPHEIGHT;
+
+static const char g_world_section_name[]         = WORLD_SECTION_NAME;
+static const char g_world_map_name[]             = WORLD_MAP;
+static const char g_world_palette_name[]         = WORLD_PALETTE;
+static const char g_world_images_name[]          = WORLD_IMAGES;
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: trv_ini_short
+ *
+ * Description:
+ *   Reads a short value from the INI file and assures that it is within
+ *   range for an a int16_t
+ *
+ ***************************************************************************/
+
+static int trv_ini_short(INIHANDLE inihandle, FAR int16_t *value,
+                         FAR const char *section, FAR const char *name)
+{
+  /* Read the long integer from the .INI file.  We supply the default
+   * value of INT32_MAX.  If this value is returned, we assume that
+   * that is evidence that the requested value was not supplied in the
+   * .INI file.
+   */
+
+  long inivalue = inifile_read_integer(inihandle, section, name, INT32_MAX);
+
+  /* Make sure that it is in range for a int16_t. */
+
+  if (inivalue < INT16_MIN || inivalue > INT16_MAX)
+    {
+      /* It is not!... */
+
+      *value = 0;
+
+      /* Is this because the integer was not found? or because
+       * it is really out of range.
+       */
+
+      if (inivalue != INT32_MAX)
+        {
+
+          fprintf(stderr, "ERROR: Integer out of range in INI file:\n");
+          fprintf(stderr, "       Section=\"%s\" Variable name=\"%s\" value=%ld\n",
+                  section, name, (long)inivalue);
+          return -ENOENT;
+
+        }
+      else
+        {
+          fprintf(stderr, "ERROR: Required integer not found in INI file:\n");
+          fprintf(stderr, "       Section=\"%s\" Variable name=\"%s\"\n",
+                  section, name);
+          return -ERANGE;
+        }
+    }
+  else
+    {
+      *value = (int16_t)inivalue;
+      return OK;
+    }
+}
+
+/****************************************************************************
+ * Name: trv_ini_long
+ *
+ * Description:
+ *   Reads a long value from the INI file
+ *
+ ***************************************************************************/
+
+#if 0 /* Not used */
+static uint8_t trv_ini_long(INIHANDLE inihandle, FAR long *value,
+                            FAR const char *section, FAR const char *name)
+{
+  /* Read the long integer from the .INI file.*/
+
+  *value = inifile_read_integer(inihandle, section, name, 0);
+  return 0;
+}
+#endif
+
+/****************************************************************************
+ * Name: trv_ini_filename
+ *
+ * Description:
+ *   Reads a file name from the the INI file.
+ *
+ ***************************************************************************/
+
+static int trv_ini_filename(INIHANDLE inihandle, FAR char **filename,
+                            FAR const char *section, FAR const char *name)
+{
+  /* Read the string from the .INI file.  We supply the default value of
+   * NULL.  If this value is returned, we assume that that is evidence that
+   * the requested value was not supplied in the .INI file.
+   */
+
+  FAR char *value = inifile_read_string(inihandle, section, name, NULL);
+
+  /* Did we get the file name? */
+
+  if (!value)
+    {
+      /* No... */
+
+      *filename = NULL;
+
+      fprintf(stderr, "ERROR: Required filename not found in INI file:\n");
+      fprintf(stderr, "       Section=\"%s\" Variable name=\"%s\"\n",
+              section, name);
+      return -ENOENT;
+    }
+  else
+    {
+      *filename = value;
+      return OK;
+    }
+}
+/****************************************************************************
+ * Name: trv_manage_wldfile
+ *
+ * Description:
+ *   This is the guts of trv_world_create.  It is implemented as a separate 
+ *   function in order to simplify error handling
+ *
+ ***************************************************************************/
+
+static int trv_manage_wldfile(INIHANDLE inihandle)
+{
+  FAR char *filename;
+  int ret;
+
+  /* Read the initial camera/player position */
+
+  ret = trv_ini_short(inihandle, &g_initial_camera.x, 
+                      g_camera_section_name, g_camera_initialx_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  ret = trv_ini_short(inihandle, &g_initial_camera.y,
+                      g_camera_section_name, g_camera_initialy_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  ret = trv_ini_short(inihandle, &g_initial_camera.z,
+                      g_camera_section_name, g_camera_initialz_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  /* Get the player's yaw/pitch orientation */
+
+  ret = trv_ini_short(inihandle, &g_initial_camera.yaw,
+                      g_camera_section_name, g_camera_initialyaw_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  ret = trv_ini_short(inihandle, &g_initial_camera.pitch, 
+                      g_camera_section_name, g_camera_initialpitch_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  /* Get the height of the player */
+
+  ret = trv_ini_short(inihandle, &g_player_height,
+                      g_player_section_name, g_player_height_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  /* Read the player's capability to step on top of things in the world. */
+
+  ret = trv_ini_short(inihandle, &g_walk_stepheight,
+                      g_player_section_name, g_player_walkstepheight_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  ret = trv_ini_short(inihandle, &g_run_stepheight,
+                      g_player_section_name, g_player_runstepheight_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  /* Get the name of the file containing the world map */
+
+  ret = trv_ini_filename(inihandle, &filename,
+                         g_world_section_name, g_world_map_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  /* Allocate and load the world */
+
+  ret = trv_initialize_planes();
+   if (ret < 0)
+    {
+      return ret;
+    }
+
+  ret = trv_load_planefile(filename);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  inifile_free_string(filename);
+
+  /* Get the name of the file containing the palette table which is used
+   * to adjust the lighting with distance.
+   */
+
+  ret = trv_ini_filename(inihandle, &filename,
+                         g_world_section_name, g_world_palette_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  /* Then load it into g_paltable. */
+
+  ret = trv_load_paltable(filename);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  inifile_free_string(filename);
+
+  /* Get the name of the file containing the texture data */
+
+  ret = trv_ini_filename(inihandle, &filename,
+                         g_world_section_name, g_world_images_name);
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  /* Then load the bitmaps */
+
+  ret = trv_initialize_bitmaps();
+  if (ret < 0)
+    {
+      return ret;
+    }
+
+  ret = trv_load_bitmapfile(filename);
+  inifile_free_string(filename);
+
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: trv_world_create
+ *
+ * Description:
+ *   Load the world data structures from information in an INI file
+ *
+ ***************************************************************************/
+
+int trv_world_create(FAR const char *wldfile)
+{
+  INIHANDLE inihandle;
+  int ret;
+
+  /* Open the INI file which contains all of the information that we
+   * need to construct the world
+   */
+
+  inihandle = inifile_initialize(wldfile);
+  if (!inihandle)
+    {
+      fprintf(stderr, "ERROR:  Could not open INI file=\"%s\"\n", wldfile);
+      return -ENOENT;
+    }
+
+  /* Load the world file data */
+
+  ret = trv_manage_wldfile(inihandle);
+
+  /* Close the INI file and return */
+
+  inifile_uninitialize(inihandle);
+  return ret;
+}
+
+/****************************************************************************
+ * Name: trv_world_destroy
+ *
+ * Description:
+ *   Destroy the world and release all of its resources
+ *
+ ***************************************************************************/
+
+void trv_world_destroy(void)
+{
+  trv_release_planes();
+  trv_release_bitmaps();
+  trv_release_paltable();
+}