73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/* *****************************************************************************
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* update.c -- update the scene.
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* Copyright (C) 2017 Olivier "Ninestars" Lanneau
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* Copyright (C) 2017 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
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*
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* This file is part of libwindmill.
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* libwindmill is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 3.0 of the License,
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* or (at your option) any later version.
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*
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* libwindmill is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with libwindmill; if not, see <http://www.gnu.org/licenses/>.
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* ************************************************************************** */
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#include <libwindmill/internals.h>
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/**
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* wml_update_camera:
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* Update the camera.
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*
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* @arg scene the scene to update.
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*/
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void wml_update_camera(wml_scene_t *scene)
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{
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scene->camera_yaw = (int)(scene->camera_yaw + 360) % 360;
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float camera_yaw_rad = M_PI * scene->camera_yaw / 180.0;
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/* calculate intermediate value */
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float camera_pitch_rad = M_PI * scene->camera_pitch / 180.0;
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float cos_yaw = cosf(camera_yaw_rad), sin_yaw = sinf(camera_yaw_rad);
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float cos_pitch = cosf(camera_pitch_rad);
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float sin_pitch = sinf(camera_pitch_rad);
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/* set final values */
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scene->a1 = 128.0 * cos_yaw;
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scene->a2 = 128.0 * -sin_yaw;
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scene->a3 = 0.0;
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scene->a4 = 128.0 * cos_pitch * sin_yaw;
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scene->a5 = 128.0 * cos_pitch * cos_yaw;
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scene->a6 = 128.0 * -sin_pitch;
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scene->a7 = 128.0 * sin_pitch * sin_yaw;
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scene->a8 = 128.0 * sin_pitch * cos_yaw;
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scene->a9 = 128.0 * cos_pitch;
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}
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/**
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* wml_update_viewport:
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* Update the viewport.
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*
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* @arg scene the scene to update.
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*/
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void wml_update_viewport(wml_scene_t *scene)
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{
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free(scene->z_buffer);
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scene->shift_x = (scene->viewport_x1 + scene->viewport_x2 - 128) / 2;
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scene->shift_y = (scene->viewport_y1 + scene->viewport_y2 - 64) / 2;
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scene->z_buffer_size = (scene->viewport_x2 - scene->viewport_x1)
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* (scene->viewport_y2 -scene->viewport_y2);
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scene->z_buffer = (unsigned short*)calloc(scene->z_buffer_size, 2);
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scene->z_buffer_width = scene->viewport_x2 - scene->viewport_x1;
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scene->z_buffer_offset = 64 - scene->viewport_x1
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+ scene->z_buffer_width * (32 - scene->viewport_y1);
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memset(scene->z_buffer, 0xFF, scene->z_buffer_size * 2);
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}
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