406 lines
13 KiB
C
406 lines
13 KiB
C
#include "pxl8_world.h"
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#include <stdlib.h>
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#include <string.h>
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#include "pxl8_bsp.h"
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#include "pxl8_gen.h"
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#include "pxl8_log.h"
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#include "pxl8_math.h"
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struct pxl8_world {
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pxl8_bsp bsp;
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bool loaded;
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bool wireframe;
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u32 wireframe_color;
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};
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pxl8_world* pxl8_world_create(void) {
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pxl8_world* world = (pxl8_world*)calloc(1, sizeof(pxl8_world));
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if (!world) {
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pxl8_error("Failed to allocate world");
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return NULL;
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}
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world->loaded = false;
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world->wireframe_color = 15;
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return world;
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}
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void pxl8_world_destroy(pxl8_world* world) {
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if (!world) return;
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if (world->loaded) {
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pxl8_bsp_destroy(&world->bsp);
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}
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free(world);
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}
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pxl8_result pxl8_world_generate(pxl8_world* world, pxl8_gfx* gfx, const pxl8_procgen_params* params) {
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if (!world || !gfx || !params) {
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pxl8_error("Invalid arguments to pxl8_world_generate");
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return PXL8_ERROR_INVALID_ARGUMENT;
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}
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if (world->loaded) {
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pxl8_bsp_destroy(&world->bsp);
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world->loaded = false;
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}
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memset(&world->bsp, 0, sizeof(pxl8_bsp));
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pxl8_result result = pxl8_procgen(&world->bsp, params);
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if (result != PXL8_OK) {
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pxl8_error("Failed to generate world: %d", result);
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pxl8_bsp_destroy(&world->bsp);
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return result;
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}
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world->loaded = true;
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return PXL8_OK;
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}
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pxl8_result pxl8_world_load(pxl8_world* world, const char* path) {
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if (!world || !path) return PXL8_ERROR_INVALID_ARGUMENT;
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if (world->loaded) {
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pxl8_bsp_destroy(&world->bsp);
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world->loaded = false;
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}
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memset(&world->bsp, 0, sizeof(pxl8_bsp));
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pxl8_result result = pxl8_bsp_load(path, &world->bsp);
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if (result != PXL8_OK) {
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pxl8_error("Failed to load world: %s", path);
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return result;
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}
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world->loaded = true;
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pxl8_info("Loaded world: %s", path);
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return PXL8_OK;
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}
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void pxl8_world_unload(pxl8_world* world) {
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if (!world || !world->loaded) return;
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pxl8_bsp_destroy(&world->bsp);
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world->loaded = false;
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}
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pxl8_result pxl8_world_apply_textures(pxl8_world* world, const pxl8_world_texture* textures, u32 count) {
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if (!world || !world->loaded || !textures || count == 0) {
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return PXL8_ERROR_INVALID_ARGUMENT;
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}
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pxl8_bsp* bsp = &world->bsp;
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u32 max_texinfo = count * 6;
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bsp->texinfo = calloc(max_texinfo, sizeof(pxl8_bsp_texinfo));
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if (!bsp->texinfo) {
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return PXL8_ERROR_OUT_OF_MEMORY;
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}
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bsp->num_texinfo = 0;
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for (u32 face_idx = 0; face_idx < bsp->num_faces; face_idx++) {
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pxl8_bsp_face* face = &bsp->faces[face_idx];
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pxl8_vec3 normal = bsp->planes[face->plane_id].normal;
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u32 matched_texture_idx = count;
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for (u32 tex_idx = 0; tex_idx < count; tex_idx++) {
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if (textures[tex_idx].rule && textures[tex_idx].rule(&normal, face, bsp)) {
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matched_texture_idx = tex_idx;
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break;
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}
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}
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if (matched_texture_idx >= count) {
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pxl8_warn("No texture rule matched for face %u", face_idx);
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continue;
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}
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const pxl8_world_texture* matched = &textures[matched_texture_idx];
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pxl8_vec3 u_axis, v_axis;
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if (fabsf(normal.y) > 0.9f) {
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u_axis = (pxl8_vec3){1.0f, 0.0f, 0.0f};
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v_axis = (pxl8_vec3){0.0f, 0.0f, 1.0f};
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} else if (fabsf(normal.x) > 0.7f) {
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u_axis = (pxl8_vec3){0.0f, 1.0f, 0.0f};
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v_axis = (pxl8_vec3){0.0f, 0.0f, 1.0f};
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} else {
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u_axis = (pxl8_vec3){1.0f, 0.0f, 0.0f};
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v_axis = (pxl8_vec3){0.0f, 1.0f, 0.0f};
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}
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u32 texinfo_idx = bsp->num_texinfo;
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bool found_existing = false;
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for (u32 i = 0; i < bsp->num_texinfo; i++) {
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if (strcmp(bsp->texinfo[i].name, matched->name) == 0 &&
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bsp->texinfo[i].miptex == matched->texture_id &&
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bsp->texinfo[i].u_axis.x == u_axis.x &&
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bsp->texinfo[i].u_axis.y == u_axis.y &&
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bsp->texinfo[i].u_axis.z == u_axis.z &&
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bsp->texinfo[i].v_axis.x == v_axis.x &&
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bsp->texinfo[i].v_axis.y == v_axis.y &&
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bsp->texinfo[i].v_axis.z == v_axis.z) {
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texinfo_idx = i;
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found_existing = true;
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break;
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}
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}
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if (!found_existing) {
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if (bsp->num_texinfo >= max_texinfo) {
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pxl8_error("Too many unique texinfo entries");
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return PXL8_ERROR_OUT_OF_MEMORY;
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}
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memcpy(bsp->texinfo[texinfo_idx].name, matched->name, sizeof(bsp->texinfo[texinfo_idx].name));
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bsp->texinfo[texinfo_idx].name[sizeof(bsp->texinfo[texinfo_idx].name) - 1] = '\0';
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bsp->texinfo[texinfo_idx].miptex = matched->texture_id;
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bsp->texinfo[texinfo_idx].u_offset = 0.0f;
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bsp->texinfo[texinfo_idx].v_offset = 0.0f;
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bsp->texinfo[texinfo_idx].u_axis = u_axis;
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bsp->texinfo[texinfo_idx].v_axis = v_axis;
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bsp->num_texinfo++;
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}
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face->texinfo_id = texinfo_idx;
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}
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pxl8_info("Applied %u textures to %u faces, created %u texinfo entries",
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count, bsp->num_faces, bsp->num_texinfo);
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return PXL8_OK;
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}
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bool pxl8_world_check_collision(const pxl8_world* world, pxl8_vec3 pos, f32 radius) {
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if (!world || !world->loaded) return false;
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const pxl8_bsp* bsp = &world->bsp;
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for (u32 i = 0; i < bsp->num_faces; i++) {
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const pxl8_bsp_face* face = &bsp->faces[i];
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const pxl8_bsp_plane* plane = &bsp->planes[face->plane_id];
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if (fabsf(plane->normal.y) > 0.7f) {
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continue;
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}
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f32 dist = plane->normal.x * pos.x +
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plane->normal.y * pos.y +
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plane->normal.z * pos.z - plane->dist;
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if (fabsf(dist) > radius) {
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continue;
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}
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pxl8_vec3 closest_point = {
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pos.x - plane->normal.x * dist,
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pos.y - plane->normal.y * dist,
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pos.z - plane->normal.z * dist
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};
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if (closest_point.x < face->aabb_min.x - radius || closest_point.x > face->aabb_max.x + radius ||
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closest_point.y < face->aabb_min.y - radius || closest_point.y > face->aabb_max.y + radius ||
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closest_point.z < face->aabb_min.z - radius || closest_point.z > face->aabb_max.z + radius) {
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continue;
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}
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return true;
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}
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return false;
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}
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bool pxl8_world_is_loaded(const pxl8_world* world) {
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return world && world->loaded;
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}
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pxl8_vec3 pxl8_world_resolve_collision(const pxl8_world* world, pxl8_vec3 from, pxl8_vec3 to, f32 radius) {
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if (!world || !world->loaded) return to;
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const pxl8_bsp* bsp = &world->bsp;
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pxl8_vec3 pos = to;
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pxl8_vec3 original_velocity = {to.x - from.x, to.y - from.y, to.z - from.z};
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pxl8_vec3 clip_planes[5];
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u32 num_planes = 0;
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const f32 edge_epsilon = 1.2f;
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const f32 radius_min = -radius + edge_epsilon;
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const f32 radius_max = radius - edge_epsilon;
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for (i32 iteration = 0; iteration < 4; iteration++) {
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bool collided = false;
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for (u32 i = 0; i < bsp->num_faces; i++) {
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const pxl8_bsp_face* face = &bsp->faces[i];
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const pxl8_bsp_plane* plane = &bsp->planes[face->plane_id];
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if (fabsf(plane->normal.y) > 0.7f) continue;
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f32 dist = plane->normal.x * pos.x +
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plane->normal.y * pos.y +
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plane->normal.z * pos.z - plane->dist;
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f32 abs_dist = fabsf(dist);
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if (abs_dist > radius) continue;
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pxl8_vec3 closest_point = {
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pos.x - plane->normal.x * dist,
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pos.y - plane->normal.y * dist,
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pos.z - plane->normal.z * dist
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};
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if (closest_point.x < face->aabb_min.x + radius_min || closest_point.x > face->aabb_max.x + radius_max ||
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closest_point.y < face->aabb_min.y + radius_min || closest_point.y > face->aabb_max.y + radius_max ||
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closest_point.z < face->aabb_min.z + radius_min || closest_point.z > face->aabb_max.z + radius_max) {
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continue;
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}
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f32 penetration = radius - abs_dist;
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if (penetration > 0.01f) {
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pxl8_vec3 push_dir;
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if (dist < 0) {
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push_dir.x = -plane->normal.x;
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push_dir.y = -plane->normal.y;
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push_dir.z = -plane->normal.z;
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} else {
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push_dir.x = plane->normal.x;
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push_dir.y = plane->normal.y;
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push_dir.z = plane->normal.z;
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}
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bool is_new_plane = true;
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for (u32 p = 0; p < num_planes; p++) {
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if (pxl8_vec3_dot(push_dir, clip_planes[p]) > 0.99f) {
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is_new_plane = false;
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break;
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}
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}
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if (is_new_plane && num_planes < 5) {
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clip_planes[num_planes++] = push_dir;
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}
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pos.x += push_dir.x * penetration;
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pos.y += push_dir.y * penetration;
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pos.z += push_dir.z * penetration;
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collided = true;
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}
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}
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if (!collided) {
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break;
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}
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if (num_planes >= 3) {
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break;
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}
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}
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if (num_planes == 2) {
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f32 orig_vel_len_sq = original_velocity.x * original_velocity.x +
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original_velocity.y * original_velocity.y +
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original_velocity.z * original_velocity.z;
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if (orig_vel_len_sq > 0.000001f) {
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f32 vdot0 = pxl8_vec3_dot(original_velocity, clip_planes[0]);
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f32 vdot1 = pxl8_vec3_dot(original_velocity, clip_planes[1]);
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f32 dot0 = fabsf(vdot0);
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f32 dot1 = fabsf(vdot1);
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pxl8_vec3 slide_vel;
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if (dot0 < dot1) {
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slide_vel.x = original_velocity.x - clip_planes[0].x * vdot0;
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slide_vel.y = original_velocity.y - clip_planes[0].y * vdot0;
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slide_vel.z = original_velocity.z - clip_planes[0].z * vdot0;
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} else {
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slide_vel.x = original_velocity.x - clip_planes[1].x * vdot1;
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slide_vel.y = original_velocity.y - clip_planes[1].y * vdot1;
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slide_vel.z = original_velocity.z - clip_planes[1].z * vdot1;
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}
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f32 slide_len = sqrtf(slide_vel.x * slide_vel.x + slide_vel.y * slide_vel.y + slide_vel.z * slide_vel.z);
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if (slide_len > 0.01f) {
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pos.x += slide_vel.x;
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pos.y += slide_vel.y;
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pos.z += slide_vel.z;
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pxl8_vec3 crease_dir = pxl8_vec3_cross(clip_planes[0], clip_planes[1]);
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f32 crease_len = pxl8_vec3_length(crease_dir);
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if (crease_len > 0.01f && fabsf(crease_dir.y / crease_len) > 0.9f) {
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f32 bias0 = pxl8_vec3_dot(original_velocity, clip_planes[0]);
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f32 bias1 = pxl8_vec3_dot(original_velocity, clip_planes[1]);
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if (bias0 < 0 && bias1 < 0) {
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const f32 corner_push = 0.1f;
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pxl8_vec3 push_away = {
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clip_planes[0].x + clip_planes[1].x,
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clip_planes[0].y + clip_planes[1].y,
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clip_planes[0].z + clip_planes[1].z
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};
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f32 push_len_sq = push_away.x * push_away.x + push_away.y * push_away.y + push_away.z * push_away.z;
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if (push_len_sq > 0.000001f) {
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f32 inv_push_len = corner_push / sqrtf(push_len_sq);
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pos.x += push_away.x * inv_push_len;
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pos.y += push_away.y * inv_push_len;
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pos.z += push_away.z * inv_push_len;
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}
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}
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}
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}
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}
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}
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f32 horizontal_movement_sq = (pos.x - from.x) * (pos.x - from.x) +
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(pos.z - from.z) * (pos.z - from.z);
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f32 desired_horizontal_sq = (to.x - from.x) * (to.x - from.x) +
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(to.z - from.z) * (to.z - from.z);
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if (desired_horizontal_sq > 0.01f && horizontal_movement_sq < desired_horizontal_sq * 0.25f) {
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const f32 max_step_height = 0.4f;
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pxl8_vec3 step_up = pos;
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step_up.y += max_step_height;
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if (!pxl8_world_check_collision(world, step_up, radius)) {
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pxl8_vec3 step_forward = {
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step_up.x + (to.x - pos.x),
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step_up.y,
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step_up.z + (to.z - pos.z)
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};
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if (!pxl8_world_check_collision(world, step_forward, radius)) {
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pos = step_forward;
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}
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}
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}
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return pos;
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}
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void pxl8_world_render(pxl8_world* world, pxl8_gfx* gfx, pxl8_vec3 camera_pos) {
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if (!world || !gfx || !world->loaded) {
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static int count = 0;
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if (count++ < 10) {
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pxl8_debug("world_render: early return - world=%p, gfx=%p, loaded=%d",
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(void*)world, (void*)gfx, world ? world->loaded : -1);
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}
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return;
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}
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if (world->wireframe) {
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pxl8_bsp_render_wireframe(gfx, &world->bsp, camera_pos, world->wireframe_color);
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} else {
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pxl8_bsp_render_textured(gfx, &world->bsp, camera_pos);
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}
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}
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