97 lines
4.1 KiB
C
97 lines
4.1 KiB
C
/****************************************************************************
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* apps/graphics/traveler/include/trv_rayrend.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_RAYEND_H
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#define __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_RAYEND_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include "trv_types.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* The following macro calculates the texture index for the given the
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* horizontal position (h), the vertical position (v) and the log2 bitmap
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* size (s).
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*/
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#define TMASK(s) ((1 << (s)) - 1)
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#define TFIX(x,s) ((x) << (s))
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#define TFRAC(x,m) ((x) & (m))
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#define TNDX(h,v,s,m) (TFIX( TFRAC( (~(v)), m ), s) + TFRAC( h, m ) )
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/* Here is a macro to extract one pixel from a WALL texture. This is used
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* by the raycasters to determine a hit in a transparent wall hit an
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* opaque portion of the texture
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*/
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#define GET_FRONT_PIXEL(r,h,v) \
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trv_get_rectpixel(h,v,g_even_bitmaps[ (r)->texture ], (r)->scale)
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#define GET_BACK_PIXEL(r,h,v) \
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trv_get_rectpixel(h,v,g_odd_bitmaps[ (r)->texture ], (r)->scale)
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/* This is special value of a pixel in a "grandparent" rectangle which means
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* that the pixel is transparent.
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*/
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#define INVISIBLE_PIXEL 0
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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struct trv_camera_s;
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struct trv_graphics_info_s;
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struct trv_bitmap_s;
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void trv_rend_backdrop(FAR struct trv_camera_s *camera,
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FAR struct trv_graphics_info_s *ginfo);
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void trv_rend_cell(uint8_t row, uint8_t col, uint8_t height, uint8_t width);
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void trv_rend_row(uint8_t row, uint8_t col, uint8_t width);
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void trv_rend_column(uint8_t row, uint8_t col, uint8_t height);
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void trv_rend_pixel(uint8_t row, uint8_t col);
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trv_pixel_t trv_get_rectpixel(int16_t hPos, int16_t vPos,
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FAR struct trv_bitmap_s *bmp, uint8_t scale);
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#endif /* __APPS_GRAPHICS_TRAVELER_INCLUDE_TRV_RAYEND_H */
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