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#include "all.h"
#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>
char map_peek(MapParser *p) {
if (p->pos >= p->length) return 0;
return p->data[p->pos];
}
char map_get(MapParser *p) {
if (p->pos >= p->length) return 0;
return p->data[p->pos++];
}
void map_skip_whitespace(MapParser *p) {
while (true) {
char c = map_peek(p);
if (isspace(c)) {
map_get(p);
} else if (c == '/' && p->data[p->pos + 1] == '/') {
while (map_peek(p) != '\n' && map_peek(p) != 0) map_get(p);
} else {
break;
}
}
}
bool map_expect(MapParser *p, char expected) {
map_skip_whitespace(p);
if (map_get(p) == expected) return true;
return false;
}
void map_parse_token(MapParser *p, char *buffer, int size) {
map_skip_whitespace(p);
int i = 0;
bool quoted = false;
if (map_peek(p) == '"') {
quoted = true;
map_get(p);
}
while (true) {
char c = map_peek(p);
if (c == 0) break;
if (quoted) {
if (c == '"') {
map_get(p);
break;
}
} else {
if (isspace(c) || c == '(' || c == ')' || c == '{' || c == '}') break;
}
if (i < size - 1) buffer[i++] = map_get(p);
else map_get(p);
}
buffer[i] = 0;
}
Vector3 map_parse_vector(MapParser *p) {
map_expect(p, '(');
char buf[64];
map_parse_token(p, buf, sizeof(buf));
float x = (float)atof(buf);
map_parse_token(p, buf, sizeof(buf));
float y = (float)atof(buf);
map_parse_token(p, buf, sizeof(buf));
float z = (float)atof(buf);
map_expect(p, ')');
return (Vector3){ x, z, -y };
}
Map ParseMap(const char *filename) {
size_t size;
char *data = read_entire_file(filename, &size);
Map map = { 0 };
if (!data) return map;
MapParser p = { data, size, 0 };
array(MapEntity) entities;
array_init(entities);
while (true) {
map_skip_whitespace(&p);
if (map_peek(&p) == 0) break;
if (map_expect(&p, '{')) {
MapEntity entity = { 0 };
array(MapProperty) props;
array(MapBrush) brushes;
array_init(props);
array_init(brushes);
while (true) {
map_skip_whitespace(&p);
char c = map_peek(&p);
if (c == '}') {
map_get(&p);
break;
} else if (c == '"') {
MapProperty prop;
map_parse_token(&p, prop.key, sizeof(prop.key));
map_parse_token(&p, prop.value, sizeof(prop.value));
array_push(props, prop);
} else if (c == '{') {
map_get(&p);
MapBrush brush = { 0 };
array(MapPlane) planes;
array_init(planes);
while (true) {
map_skip_whitespace(&p);
if (map_peek(&p) == '}') {
map_get(&p);
break;
}
MapPlane plane;
plane.p[0] = map_parse_vector(&p);
plane.p[1] = map_parse_vector(&p);
plane.p[2] = map_parse_vector(&p);
map_parse_token(&p, plane.texture, sizeof(plane.texture));
char buf[64];
map_parse_token(&p, buf, sizeof(buf)); plane.shift[0] = (float)atof(buf);
map_parse_token(&p, buf, sizeof(buf)); plane.shift[1] = (float)atof(buf);
map_parse_token(&p, buf, sizeof(buf)); plane.rotate = (float)atof(buf);
map_parse_token(&p, buf, sizeof(buf)); plane.scale[0] = (float)atof(buf);
map_parse_token(&p, buf, sizeof(buf)); plane.scale[1] = (float)atof(buf);
array_push(planes, plane);
}
brush.planes = planes.data;
brush.plane_count = (int)planes.length;
array_push(brushes, brush);
} else {
map_get(&p);
}
}
entity.properties = props.data;
entity.property_count = (int)props.length;
entity.brushes = brushes.data;
entity.brush_count = (int)brushes.length;
array_push(entities, entity);
}
}
map.entities = entities.data;
map.entity_count = (int)entities.length;
free(data);
return map;
}
void FreeMap(Map map) {
for (int i = 0; i < map.entity_count; i++) {
MapEntity *e = &map.entities[i];
if (e->properties) free(e->properties);
for (int j = 0; j < e->brush_count; j++) {
if (e->brushes[j].planes) free(e->brushes[j].planes);
}
if (e->brushes) free(e->brushes);
}
if (map.entities) free(map.entities);
}
Plane PlaneFromPoints(Vector3 p1, Vector3 p2, Vector3 p3) {
Vector3 v1 = Vector3Subtract(p2, p1);
Vector3 v2 = Vector3Subtract(p3, p1);
Vector3 normal = Vector3Normalize(Vector3CrossProduct(v1, v2));
return (Plane){ normal, Vector3DotProduct(normal, p1) };
}
void PolyFree(Polygon p) {
if (p.verts) free(p.verts);
}
Polygon PolyClip(Polygon poly, Plane plane) {
if (poly.count == 0) return poly;
array(Vector3) out_verts;
array_init(out_verts);
for (int i = 0; i < poly.count; i++) {
Vector3 p1 = poly.verts[i];
Vector3 p2 = poly.verts[(i + 1) % poly.count];
float d1 = Vector3DotProduct(plane.normal, p1) - plane.dist;
float d2 = Vector3DotProduct(plane.normal, p2) - plane.dist;
// Using a smaller epsilon and more robust logic
const float eps = 0.001f;
if (d1 >= -eps) {
if (d2 >= -eps) {
array_push(out_verts, p2);
} else {
float t = d1 / (d1 - d2);
Vector3 intersect = Vector3Add(p1, Vector3Scale(Vector3Subtract(p2, p1), t));
array_push(out_verts, intersect);
}
} else {
if (d2 >= -eps) {
float t = d1 / (d1 - d2);
Vector3 intersect = Vector3Add(p1, Vector3Scale(Vector3Subtract(p2, p1), t));
array_push(out_verts, intersect);
array_push(out_verts, p2);
}
}
}
Polygon res;
res.verts = out_verts.data;
res.count = (int)out_verts.length;
return res;
}
Polygon CreateLargeQuad(Plane plane) {
Vector3 n = plane.normal;
Vector3 up = (fabsf(n.y) < 0.999f) ? (Vector3){ 0, 1, 0 } : (Vector3){ 1, 0, 0 };
Vector3 right = Vector3Normalize(Vector3CrossProduct(up, n));
up = Vector3CrossProduct(n, right);
Vector3 center = Vector3Scale(n, plane.dist);
float size = 10000.0f;
Polygon poly;
poly.verts = ALLOC(Vector3, 4);
poly.count = 4;
poly.verts[0] = Vector3Add(center, Vector3Add(Vector3Scale(right, size), Vector3Scale(up, size)));
poly.verts[1] = Vector3Add(center, Vector3Add(Vector3Scale(right, -size), Vector3Scale(up, size)));
poly.verts[2] = Vector3Add(center, Vector3Add(Vector3Scale(right, -size), Vector3Scale(up, -size)));
poly.verts[3] = Vector3Add(center, Vector3Add(Vector3Scale(right, size), Vector3Scale(up, -size)));
return poly;
}
Vector2 GetUV(Vector3 p, MapPlane *mp, Plane plane) {
Vector3 n = plane.normal;
Vector3 up = (fabsf(n.y) < 0.999f) ? (Vector3){ 0, 1, 0 } : (Vector3){ 1, 0, 0 };
Vector3 right = Vector3Normalize(Vector3CrossProduct(up, n));
up = Vector3CrossProduct(n, right);
float u = Vector3DotProduct(p, right) * (1.0f / (mp->scale[0] ? mp->scale[0] : 1.0f)) + mp->shift[0];
float v = Vector3DotProduct(p, up) * (1.0f / (mp->scale[1] ? mp->scale[1] : 1.0f)) + mp->shift[1];
return (Vector2){ u / 64.0f, v / 64.0f };
}
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