Add logic to read bitmap textures from a file

graphics/traveler/Makefile

@@ -46,10 +46,11 @@ STACKSIZE = 2048
 # Traveler files
 
 ASRCS   =
-CSRCS   = trv_bitmaps.c trv_color.c trv_createworld.c trv_doors.c
+CSRCS   = trv_bitmapfile.c trv_bitmaps.c trv_color.c trv_createworld.c
-CSRCS  += trv_graphics.c trv_input.c trv_mem.c trv_planefiles.c
+CSRCS  += trv_doors.c trv_fsutils.c trv_graphics.c trv_input.c trv_mem.c
-CSRCS  += trv_planelists.c trv_pov.c trv_rayavoid.c trv_raycast.c
+CSRCS  += trv_planefiles.c trv_planelists.c trv_pov.c trv_rayavoid.c
-CSRCS  += trv_raycntl.c trv_rayprune.c trv_rayrend.c trv_trigtbl.c
+CSRCS  += trv_raycast.c trv_raycntl.c trv_rayprune.c trv_rayrend.c
+CSRCS  += trv_trigtbl.c
 MAINSRC = trv_main.c
 
 ifeq ($(CONFIG_NX),y)

graphics/traveler/include/trv_bitmaps.h

@@ -100,6 +100,8 @@ extern trv_pixel_t g_ground_color;
  ****************************************************************************/
 
 int trv_initialize_bitmaps(void);
+void trv_free_bitmaps(void);
 int trv_load_bitmapfile(FAR const char *bitmapfile);
+FAR struct trv_bitmap_s *trv_read_texture(FAR char *filename);
 
 #endif /* __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_BITMAPS_H */

graphics/traveler/include/trv_fsutils.h

@@ -0,0 +1,53 @@
+/****************************************************************************
+ * apps/graphics/traveler/include/trv_fsutils.h
+ *
+ *   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.
+ *
+ ****************************************************************************/
+
+#ifndef __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_FSUTILS_H
+#define __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_FSUTILS_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include "trv_types.h"
+
+#include <stdio.h>
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+int16_t trv_read_decimal(FAR FILE *fp);
+
+#endif /* __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_FSUTILS_H */

graphics/traveler/src/trv_bitmapfile.c

@@ -0,0 +1,232 @@
+/*******************************************************************************
+ * apps/graphics/traveler/src/trv_bitmapfile.c
+ * This file contains the logic which loads texture bitmaps
+ *
+ *   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_mem.h"
+#include "trv_world.h"
+#include "trv_bitmaps.h"
+#include "trv_fsutils.h"
+
+#include <stdio.h>
+#include <ctype.h>
+#include <errno.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: trv_read_filename
+ *
+ * Description:
+ *   Read a file name from the input stream
+ *
+ ***************************************************************************/
+
+static int trv_read_filename(FAR FILE  *fp, FAR char *filename)
+{
+  int16_t nbytes;
+  int ch;
+
+  /* Skip over any leading whitespace */
+
+  do
+    {
+      ch = getc(fp);
+    }
+  while (isspace(ch));
+
+  if (ch == EOF)
+    {
+      return -ENOENT;
+    }
+
+  /* Get the file name from the file */
+
+  nbytes = 0;
+  for (;;)
+    {
+      /* Everything up to the next whitespace must be the filename */
+
+      if (isspace(ch) || ch == EOF)
+        {
+          /* End of the string. Don't forget the ASCIIZ terminator */
+
+          filename[nbytes] = '\0';
+          break;
+        }
+
+      /* Make sure that the file name is not too large */
+
+      else if (nbytes >= FILENAME_MAX)
+        {
+          return -E2BIG;
+        }
+
+      /* Add the new character to the file name */
+
+      else
+        {
+          filename[nbytes] = (char)ch;
+          nbytes++;
+        }
+
+      /* Get the character for the next time through the loop.  Every file
+       * name should be terminated with a space or a new line (or, possibily,
+       * EOF)
+       */
+
+      ch = getc(fp);
+    }
+
+  return OK;
+}
+
+/****************************************************************************
+ * Name: trv_load_bitmaps
+ *
+ * Description:
+ *   This function loads the world data from the input file
+ *
+ ***************************************************************************/
+
+static int trv_load_bitmaps(FAR FILE *fp)
+{
+  char filename[FILENAME_MAX];
+  int mapndx;
+  int ret = OK;
+
+  /* Discard any bitmaps that we may currently have buffered */
+
+  trv_free_bitmaps();
+
+  /* Get the number of bitmaps in the bitmap file */
+
+  g_trv_nbitmaps = trv_read_decimal(fp);
+  if (g_trv_nbitmaps >= MAX_BITMAPS)
+    {
+      return -E2BIG;
+    }
+
+  /* Read the colors used to rend the sky and ground */
+
+  g_sky_color    = trv_read_decimal(fp);
+  g_ground_color = trv_read_decimal(fp);
+
+  /* Load each bitmap file */
+
+  for (mapndx = 0; mapndx < g_trv_nbitmaps && ret == OK; mapndx++)
+    {
+      /* Load the even bitmap */
+      /* Get the name of the file which contains the even bitmap */
+
+      ret = trv_read_filename(fp, filename);
+      if (ret < 0)
+        {
+          return ret;
+        }
+
+      g_even_bitmaps[mapndx] = trv_read_texture(filename);
+      if (!g_even_bitmaps[mapndx])
+        {
+          return -EIO;
+        }
+
+      /* Load the odd bitmap */
+      /* Get the name of the file which contains the odd bitmap */
+
+      ret = trv_read_filename(fp, filename);
+      if (ret < 0)
+        {
+          return ret;
+        }
+
+#ifndef WEDIT
+      g_odd_bitmaps[mapndx] = trv_read_texture(filename);
+      if (!g_odd_bitmaps[mapndx])
+        {
+          return -EIO;
+        }
+#endif
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ***************************************************************************/
+
+/****************************************************************************
+ * Name: trv_load_bitmapfile
+ *
+ * Description:
+ *   This function opens the input file and loads the world data from it
+ *
+ ***************************************************************************/
+
+int trv_load_bitmapfile(FAR const char *bitmapfile)
+{
+  FAR FILE *fp;
+  int ret;
+
+  /* Open the file which contains the names of all of the bitmap files */
+
+  fp = fopen(bitmapfile, "r");
+  if (!fp)
+    {
+      int errcode = errno;
+      return -errcode;
+    }
+
+  /* Load all of the bitmaps */
+
+  ret = trv_load_bitmaps(fp);
+  if (ret < 0)
+    {
+      trv_free_bitmaps();
+    }
+
+  /* We are all done with the file, so close it */
+
+  fclose(fp);
+  return ret;
+}
+

graphics/traveler/src/trv_bitmaps.c

@@ -1,6 +1,6 @@
 /*******************************************************************************
  * apps/graphics/traveler/src/trv_bitmaps.c
- * This file contains the global variables use by the texture bitmap logic
+ * This file contains low-level texture bitmap logic
  *
  *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
@@ -39,6 +39,7 @@
  ****************************************************************************/
 
 #include "trv_types.h"
+#include "trv_mem.h"
 #include "trv_bitmaps.h"
 
 /****************************************************************************
@@ -69,6 +70,28 @@ uint16_t g_trv_nbitmaps;
 trv_pixel_t g_sky_color;
 trv_pixel_t g_ground_color;
 
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/*************************************************************************
+ * Name: trv_free_texture
+ *
+ * Description:
+ *   Free both the bitmap and the bitmap container
+ *
+ ************************************************************************/
+
+static void trv_free_texture(FAR struct trv_bitmap_s *bitmap)
+{
+  if (bitmap->bm)
+    {
+      trv_free(bitmap->bm);
+    }
+
+  trv_free(bitmap);
+}
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -95,3 +118,35 @@ int trv_initialize_bitmaps(void)
   g_trv_nbitmaps = 0;
   return OK;
 }
+
+/*************************************************************************
+ * Name: trv_free_bitmaps
+ *
+ * Description:
+ *   This function deallocates all bitmaps.
+ *
+ ************************************************************************/
+
+void trv_free_bitmaps(void)
+{
+  int i;
+
+  for (i = 0; i < MAX_BITMAPS; i++)
+    {
+      if (g_even_bitmaps[i])
+        {
+          trv_free_texture(g_even_bitmaps[i]);
+          g_even_bitmaps[i] = NULL;
+        }
+
+#ifndef WEDIT
+      if (g_odd_bitmaps[i])
+        {
+          trv_free_texture(g_odd_bitmaps[i]);
+          g_odd_bitmaps[i] = NULL;
+        }
+#endif
+    }
+
+  g_trv_nbitmaps = 0;
+}

graphics/traveler/src/trv_fsutils.c

@@ -0,0 +1,97 @@
+/*******************************************************************************
+ * apps/graphics/traveler/src/trv_fsutils.c
+ * Miscellaneous file access utilities
+ *
+ *   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_fsutils.h"
+
+#include <stdio.h>
+#include <ctype.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: trv_read_decimal
+ *
+ * Description:
+ *   Read a decimal number from the steam 'fp'
+ *
+ ***************************************************************************/
+
+int16_t trv_read_decimal(FAR FILE *fp)
+{
+  int16_t value = 0;
+  bool negative = false;
+  int ch;
+
+  /* Skip over any leading whitespace  */
+
+  do
+    {
+      ch = getc(fp);
+    }
+  while (isspace(ch));
+
+  /* if the first character is '-', then its a negative number */
+
+  if (ch == '-')
+    {
+      negative = true;
+      ch = getc(fp);
+    }
+
+  /* Now get the unsigned portion of the number */
+
+  while (ch >= '0' && ch <= '9')
+    {
+      value = 10  *value + (ch - (int)'0');
+      ch = getc(fp);
+    }
+
+  /* Apply the negation, if appropriate */
+
+  if (negative)
+    {
+      value = -value;
+    }
+
+  return value;
+}