/****************************************************************************
* apps/graphics/traveler/include/trv_rayrend.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_RAYEND_H
#define __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_RAYEND_H
/****************************************************************************
* Included Files
****************************************************************************/
#include "trv_types.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* The following macro calculates the texture index for the given the
* horizontal position (h), the vertical position (v) and the log2 bitmap
* size (s).
*/
#define TMASK(s) ((1 << (s)) - 1)
#define TFIX(x,s) ((x) << (s))
#define TFRAC(x,m) ((x) & (m))
#define TNDX(h,v,s,m) (TFIX( TFRAC( (~(v)), m ), s) + TFRAC( h, m ) )
/* Here is a macro to extract one pixel from a WALL texture. This is used
* by the raycasters to determine a hit in a transparent wall hit an
* opaque portion of the texture
*/
#define GET_FRONT_PIXEL(r,h,v) \
trv_get_rectpixel(h,v,g_even_bitmaps[ (r)->texture ], (r)->scale)
#define GET_BACK_PIXEL(r,h,v) \
trv_get_rectpixel(h,v,g_odd_bitmaps[ (r)->texture ], (r)->scale)
/* This is special value of a pixel in a "grandparent" rectangle which means
* that the pixel is transparent.
*/
#define INVISIBLE_PIXEL 0
/****************************************************************************
* Public Types
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
struct trv_camera_s;
struct trv_graphics_info_s;
struct trv_bitmap_s;
void trv_rend_backdrop(FAR struct trv_camera_s *camera,
FAR struct trv_graphics_info_s *ginfo);
void trv_rend_cell(uint8_t row, uint8_t col, uint8_t height, uint8_t width);
void trv_rend_row(uint8_t row, uint8_t col, uint8_t width);
void trv_rend_column(uint8_t row, uint8_t col, uint8_t height);
void trv_rend_pixel(uint8_t row, uint8_t col);
trv_pixel_t trv_get_rectpixel(int16_t hPos, int16_t vPos,
FAR struct trv_bitmap_s *bmp, uint8_t scale);
#endif /* __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_RAYEND_H */
