diff options
Diffstat (limited to 'src/render_sprite.c')
| -rw-r--r-- | src/render_sprite.c | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/render_sprite.c b/src/render_sprite.c new file mode 100644 index 0000000..0570a71 --- /dev/null +++ b/src/render_sprite.c @@ -0,0 +1,84 @@ +/* ************************************************************************** */ +/* */ +/* ::: :::::::: */ +/* render_sprite.c :+: :+: :+: */ +/* +:+ +:+ +:+ */ +/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */ +/* +#+#+#+#+#+ +#+ */ +/* Created: 2020/02/02 17:39:07 by cacharle #+# #+# */ +/* Updated: 2020/02/02 23:52:29 by cacharle ### ########.fr */ +/* */ +/* ************************************************************************** */ + +#include "cub3d.h" + +int sprite_compar(const void *a, const void *b) +{ + const t_sprite *sprite_a; + const t_sprite *sprite_b; + + sprite_a = a; + sprite_b = b; + if (sprite_a->dist > sprite_b->dist) + return -1; + if (sprite_a->dist < sprite_b->dist) + return 1; + return 0; +} + +void sprites_dist(t_state *state) +{ + int i; + + i = -1; + while (++i < state->sprites_num) + state->sprites[i].dist = vector_norm(vector_sub(state->sprites[i].pos, state->pos)); +} + +void render_update_sprite(t_state *state) +{ + sprites_dist(state); + ft_qsort(state->sprites, state->sprites_num, sizeof(t_sprite), sprite_compar); + for(int i = 0; i < state->sprites_num; i++) + { + double sprite_x = state->sprites[i].pos.x - state->pos.x; + double sprite_y = state->sprites[i].pos.y - state->pos.y; + + double inverse_det = 1.0 / (state->plane.x * state->dir.y - state->dir.x * state->plane.y); + double transform_x = inverse_det * (state->dir.y * sprite_x - state->dir.x * sprite_y); + double transform_y = inverse_det * (-state->plane.y * sprite_x + state->plane.x * sprite_y); + int sprite_window_x = (int)((state->window.width / 2) * (1 + transform_x / transform_y)); + + int sprite_height = abs((int)(state->window.height / (transform_y))); + int draw_start = -sprite_height / 2 + state->window.height / 2; + if(draw_start < 0) + draw_start = 0; + int draw_end_y = sprite_height / 2 + state->window.height / 2; + if(draw_end_y >= state->window.height) + draw_end_y = state->window.height - 1; + + int sprite_width = abs( (int) (state->window.height / (transform_y))); + int draw_start_x = -sprite_width / 2 + sprite_window_x; + if (draw_start_x < 0) + draw_start_x = 0; + int draw_end_x = sprite_width / 2 + sprite_window_x; + if (draw_end_x >= state->window.width) + draw_end_x = state->window.width - 1; + + for(int stripe = draw_start_x; stripe < draw_end_x; stripe++) + { + int tex_width = state->textures[TEX_SPRITE].width; + int tex_height = state->textures[TEX_SPRITE].height; + int tex_x = (int)(256 * (stripe - (-sprite_width / 2 + sprite_window_x)) * tex_width / sprite_width) / 256; + if(transform_y > 0 && stripe > 0 && stripe < state->window.width && transform_y < state->z_buffer[stripe]) + for(int y = draw_start; y < draw_end_y; y++) + { + int d = y * 256 - state->window.height * 128 + sprite_height * 128; + int tex_y = ((d * tex_height) / sprite_height) / 256; + t_color color = ((t_color*)state->textures[TEX_SPRITE].data)[tex_width * tex_y + tex_x]; + if ((color.hexcode & 0x00FFFFFF) != 0) // if not empty pixel + ((t_color*)state->window.data)[y * state->window.width + stripe] = color; + } + } + } +} |