Raimon Zamora
8dbcd4fcb7
- afegit el WAD del Doom 1 - Ja llegim FLATS i TEXTURES del WAD, falten els PATCH
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
#include "util.h"
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#include <SDL3/SDL.h>
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// Funcions de càlcul
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// Returns 1 if the lines intersect, otherwise 0. In addition, if the lines
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// intersect the intersection point may be stored in the floats i_x and i_y.
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const bool get_line_intersection(vec2 p0, vec2 p1, vec2 p2, vec2 p3, vec2 *i)
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{
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vec2 s1, s2;
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s1.x = p1.x - p0.x; s1.y = p1.y - p0.y;
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s2.x = p3.x - p2.x; s2.y = p3.y - p2.y;
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float s, t;
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s = (-s1.y * (p0.x - p2.x) + s1.x * (p0.y - p2.y)) / (-s2.x * s1.y + s1.x * s2.y);
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t = ( s2.x * (p0.y - p2.y) - s2.y * (p0.x - p2.x)) / (-s2.x * s1.y + s1.x * s2.y);
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if (s >= 0 && s <= 1 && t >= 0 && t <= 1)
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{
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// Collision detected
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if (i != NULL)
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{
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i->x = p0.x + (t * s1.x);
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i->y = p0.y + (t * s1.y);
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}
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return true;
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}
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return false; // No collision
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}
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const float distance(vec2 p1, vec2 p2)
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{
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const float xx = p2.x-p1.x;
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const float yy = p2.y-p1.y;
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return SDL_sqrtf(xx*xx+yy*yy);
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}
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const void normalize(vec2 *v)
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{
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const float length = SDL_sqrtf(v->x*v->x + v->y*v->y);
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if (length > 0.0f) {
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v->x /= length;
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v->y /= length;
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}
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}
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const float dot(vec2 v1, vec2 v2)
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{
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return v1.x*v2.x + v1.y*v2.y;
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}
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float is_enemy_in_fov(double Ax, double Ay, double orientation_deg, double Bx, double By) {
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// Convert orientation angle to radians
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double orientation_rad = orientation_deg * DEG_TO_RAD;
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// Compute view direction vector from angle
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double view_dx = SDL_cosf(orientation_rad);
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double view_dy = SDL_sinf(orientation_rad);
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// Vector from A to B
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double to_enemy_dx = Bx - Ax;
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double to_enemy_dy = By - Ay;
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// Normalize both vectors
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double len = SDL_sqrtf(to_enemy_dx * to_enemy_dx + to_enemy_dy * to_enemy_dy);
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if (len == 0) return 0.0; // Same position
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to_enemy_dx /= len;
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to_enemy_dy /= len;
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// Compute signed angle using atan2 of perp-dot and dot
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double dot = view_dx * to_enemy_dx + view_dy * to_enemy_dy;
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double cross = view_dx * to_enemy_dy - view_dy * to_enemy_dx;
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float angle_rad = SDL_atan2f(cross, dot);
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return angle_rad * RAD_TO_DEG; // Signed angle in degrees
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}
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