physics: handle entity collisions

code/game/header/profiler.h

@@ -10,6 +10,7 @@ typedef enum {
     PROF_UPDATE_SYSTEMS,
     PROF_ENTITY_LERP,
     PROF_ENTITY_REMOVAL,
+    PROF_INTEGRATE_POS,
     
     MAX_PROF,
     PROF_FORCE_UINT8 = UINT8_MAX

code/game/header/world/blocks.h

@@ -4,7 +4,7 @@
 #define BLOCK_INVALID 0xF
 
 typedef enum {
-    BLOCK_FLAG_COLLISION = (1 << 0)
+    BLOCK_FLAG_COLLISION = (1 << 1)
 } block_flags;
 
 #include "blocks_info.h"

code/game/header/world/world.h

@@ -30,11 +30,13 @@ typedef struct {
     uint32_t size;
     uint16_t chunk_size;
     uint16_t chunk_amount;
+    uint8_t **block_mapping;
     uint16_t dim;
     uint64_t tracker_update[3];
     uint8_t active_layer_id;
     ecs_world_t *ecs;
     ecs_query_t *ecs_update;
+    ecs_entity_t *chunk_mapping;
     librg_world *tracker;
     world_pkt_reader_proc *reader_proc;
     world_pkt_writer_proc *writer_proc;
@@ -55,3 +57,13 @@ librg_world * world_tracker(void);
 uint16_t world_chunk_size(void);
 uint16_t world_chunk_amount(void);
 uint16_t world_dim(void);
+ecs_entity_t world_chunk_mapping(librg_chunk id);
+
+typedef struct {
+    uint32_t id;
+    uint8_t block_id;
+    ecs_entity_t chunk_id;
+    float ox, oy;
+} world_block_lookup;
+
+world_block_lookup world_block_from_realpos(float x, float y);

code/game/source/debug_ui.c

@@ -46,6 +46,11 @@ typedef struct debug_item {
             uint8_t is_collapsed;
         } list;
         
+        struct {
+            float val, min, max;
+            void (*on_change)(float);
+        } slider;
+        
         void (*on_click)(void);
     };
     
@@ -79,6 +84,7 @@ static debug_item items[] = {
                 { .kind = DITEM_TEXT, .name = "delta time", .proc = DrawDeltaTime },
                 { .kind = DITEM_TEXT, .name = "random literal", .text = "hello", .proc = DrawLiteral },
                 { .kind = DITEM_TEXT, .name = "zoom", .proc = DrawZoom },
+                { .kind = DITEM_SLIDER, .name = "slider", .slider = { .min = 0.0f, .max = 1.0f, .val = 0.5f } },
                 { .kind = DITEM_END },
             }
         }
@@ -95,6 +101,7 @@ static debug_item items[] = {
                 { .kind = DITEM_RAW, .val = PROF_UPDATE_SYSTEMS, .proc = DrawProfilerDelta },
                 { .kind = DITEM_RAW, .val = PROF_ENTITY_LERP, .proc = DrawProfilerDelta },
                 { .kind = DITEM_RAW, .val = PROF_ENTITY_REMOVAL, .proc = DrawProfilerDelta },
+                { .kind = DITEM_RAW, .val = PROF_INTEGRATE_POS, .proc = DrawProfilerDelta },
                 { .kind = DITEM_END },
             },
             .is_collapsed = 1
@@ -163,6 +170,25 @@ debug_draw_result debug_draw_list(debug_item *list, float xpos, float ypos, bool
                 ypos = res.y;
             }break;
             
+            case DITEM_SLIDER: {
+                assert(it->slider.min != it->slider.max);
+                char const *text = TextFormat("%s: ", it->name);
+                if (it->name_width == 0) {
+                    it->name_width = UIMeasureText(text, DBG_FONT_SIZE);
+                }
+                UIDrawText(text, xpos, ypos, DBG_FONT_SIZE, RAYWHITE);
+                xpos += it->name_width;
+                
+                DrawRectangleLines(xpos, ypos, 100.0f, DBG_FONT_SIZE, RAYWHITE);
+                
+                float stick_x = xpos + ((it->slider.val / it->slider.max) * 100.0f) - 5.0f;
+                DrawRectangle(stick_x, ypos, 10.0f, DBG_FONT_SIZE, RED);
+                
+                xpos += 100.0f + 5.0f;
+                DrawFloat(xpos, ypos, it->slider.val);
+                ypos += DBG_FONT_SPACING;
+            }break;
+            
             default: {
                 
             }break;

code/game/source/entity.c

@@ -22,11 +22,19 @@ uint64_t entity_spawn(char *name) {
     
     ecs_set(world_ecs(), e, EcsName, {.alloc_value = name });
     ecs_set(world_ecs(), e, Velocity, {0});
-    ecs_set(world_ecs(), e, Position, {0});
     ecs_add(world_ecs(), e, Walking);
+    Position *pos = ecs_get_mut(world_ecs(), e, Position, NULL);
+#if 1
+    pos->x=rand() % world_dim();
+    pos->y=rand() % world_dim();
+#else
+    pos->x=35;
+    pos->y=33;
+#endif
+    
     
     librg_entity_track(world_tracker(), e);
-    librg_entity_chunk_set(world_tracker(), e, librg_chunk_from_realpos(world_tracker(), 0, 0, 0));
+    librg_entity_chunk_set(world_tracker(), e, librg_chunk_from_realpos(world_tracker(), pos->x, pos->y, 0));
     
     return (uint64_t)e;
 }

code/game/source/player.c

@@ -21,28 +21,18 @@ uint64_t player_spawn(char *name) {
     ECS_IMPORT(world_ecs(), General);
     ECS_IMPORT(world_ecs(), Controllers);
     ECS_IMPORT(world_ecs(), Net);
+    
     ecs_set(world_ecs(), e, EcsName, {.alloc_value = name });
     ecs_add(world_ecs(), e, EcsClient);
     ecs_set(world_ecs(), e, ClientInfo, {0});
     ecs_set(world_ecs(), e, Input, {0});
     ecs_add(world_ecs(), e, Player);
-    Position *pos = ecs_get_mut(world_ecs(), e, Position, NULL);
-#if 1
-    pos->x=rand() % world_dim();
-    pos->y=rand() % world_dim();
-#else
-    pos->x=10;
-    pos->y=10;
-#endif
     
     librg_entity_owner_set(world_tracker(), e, (int64_t)e);
-    librg_entity_radius_set(world_tracker(), e, 3);
-    librg_entity_chunk_set(world_tracker(), e, librg_chunk_from_realpos(world_tracker(), pos->x, pos->y, 0));
     
     return (uint64_t)e;
 }
 
 void player_despawn(uint64_t ent_id) {
-    librg_entity_untrack(world_tracker(), ent_id);
+    entity_despawn(ent_id);
-    ecs_delete(world_ecs(), ent_id);
 }

code/game/source/profiler.c

@@ -13,6 +13,7 @@ static profiler profilers[] = {
     { .id = PROF_UPDATE_SYSTEMS, .name = "update systems" },
     { .id = PROF_ENTITY_LERP, .name = "entity lerp" },
     { .id = PROF_ENTITY_REMOVAL, .name = "entity removal" },
+    { .id = PROF_INTEGRATE_POS, .name = "entity movement" },
 };
 
 static_assert((sizeof(profilers)/sizeof(profilers[0])) == MAX_PROF, "mismatched profilers");

code/game/source/world/world.c

@@ -42,7 +42,7 @@ entity_view world_build_entity_view(int64_t e) {
         view.blocks_used = 1;
         
         for (int i = 0; i < world.chunk_size*world.chunk_size; i += 1) {
-            view.blocks[i] = *ecs_vector_get(chpos->blocks, uint8_t, i);
+            view.blocks[i] = world.block_mapping[chpos->id][i];
         }
     }
     
@@ -139,6 +139,8 @@ int32_t world_init(int32_t seed, uint16_t chunk_size, uint16_t chunk_amount) {
     ECS_IMPORT(world.ecs, General);
     ECS_IMPORT(world.ecs, Net);
     world.ecs_update = ecs_query_new(world.ecs, "net.ClientInfo, general.Position");
+    world.chunk_mapping = zpl_malloc(sizeof(ecs_entity_t)*zpl_square(chunk_amount));
+    world.block_mapping = zpl_malloc(sizeof(uint8_t*)*zpl_square(chunk_amount));
     
     int32_t world_build_status = worldgen_test(&world);
     ZPL_ASSERT(world_build_status >= 0);
@@ -149,14 +151,16 @@ int32_t world_init(int32_t seed, uint16_t chunk_size, uint16_t chunk_amount) {
         librg_entity_track(world.tracker, e);
         librg_entity_chunk_set(world.tracker, e, i);
         librg_chunk_to_chunkpos(world.tracker, i, &chunk->x, &chunk->y, NULL);
-        chunk->blocks = NULL;
+        world.chunk_mapping[i] = e;
+        world.block_mapping[i] = zpl_malloc(sizeof(uint8_t)*zpl_square(chunk_size));
+        chunk->id = i;
         
         for (int y = 0; y < world.chunk_size; y += 1) {
             for (int x = 0; x < world.chunk_size; x += 1) {
                 int chk = world.chunk_size * i;
                 int chk_x = chk % world.dim;
                 int chk_y = chk / world.dim;
-                uint8_t *c = ecs_vector_add(&chunk->blocks, uint8_t);
+                uint8_t *c = &world.block_mapping[i][(y*chunk_size)+x];
                 *c = world.data[(chk_y+y)*world.dim + (chk_x+x)];
             }
         }
@@ -171,6 +175,11 @@ int32_t world_destroy(void) {
     librg_world_destroy(world.tracker);
     ecs_fini(world.ecs);
     zpl_mfree(world.data);
+    zpl_mfree(world.chunk_mapping);
+    for (int i = 0; i < zpl_square(world.chunk_amount); i+=1) {
+        zpl_mfree(world.block_mapping[i]);
+    }
+    zpl_mfree(world.block_mapping);
     zpl_memset(&world, 0, sizeof(world));
     zpl_printf("[INFO] World was destroyed.\n");
     return WORLD_ERROR_NONE;
@@ -269,3 +278,41 @@ uint16_t world_chunk_amount(void) {
 uint16_t world_dim(void) {
     return WORLD_BLOCK_SIZE * world.chunk_size * world.chunk_amount;
 }
+
+ecs_entity_t world_chunk_mapping(librg_chunk id) {
+    assert(id >= 0 && id < zpl_square(world.chunk_amount));
+    return world.chunk_mapping[id];
+}
+
+world_block_lookup world_block_from_realpos(float x, float y) {
+    x = zpl_clamp(x, 0, world_dim()-1);
+    y = zpl_clamp(y, 0, world_dim()-1);
+    librg_chunk chunk_id = librg_chunk_from_realpos(world.tracker, x, y, 0);
+    ecs_entity_t e = world.chunk_mapping[chunk_id];
+    int32_t size = world.chunk_size * WORLD_BLOCK_SIZE;
+    int16_t chunk_x, chunk_y;
+    librg_chunk_to_chunkpos(world.tracker, chunk_id, &chunk_x, &chunk_y, NULL);
+    
+    // NOTE(zaklaus): pos relative to chunk
+    float chx = x - chunk_x * size;
+    float chy = y - chunk_y * size;
+    
+    uint32_t bx = (uint32_t)chx / WORLD_BLOCK_SIZE;
+    uint32_t by = (uint32_t)chy / WORLD_BLOCK_SIZE;
+    uint32_t block_idx = (by*world.chunk_size)+bx;
+    uint8_t block_id = world.block_mapping[chunk_id][block_idx];
+    
+    // NOTE(zaklaus): pos relative to block's center
+    float box = chx - bx * WORLD_BLOCK_SIZE - WORLD_BLOCK_SIZE/2.0f;
+    float boy = chy - by * WORLD_BLOCK_SIZE - WORLD_BLOCK_SIZE/2.0f;
+    
+    world_block_lookup lookup = {
+        .id = block_idx,
+        .block_id = block_id,
+        .chunk_id = e,
+        .ox = box,
+        .oy = boy,
+    };
+    
+    return lookup;
+}

code/modules/modules/general.h

@@ -9,9 +9,10 @@ ECS_STRUCT(Vector2D, {
            });
 
 ECS_STRUCT(Chunk, {
+               uint32_t id;
                int16_t x;
                int16_t y;
-    ecs_vector(uint8_t) blocks;
+               //ecs_vector(uint8_t) blocks;
            });
 
 ECS_STRUCT(Drawable, {

code/modules/modules/physics.h

@@ -13,7 +13,7 @@ typedef struct {
     ECS_DECLARE_COMPONENT(Velocity);
     ECS_DECLARE_ENTITY(MoveWalk);
     ECS_DECLARE_ENTITY(UpdateTrackerPos);
-    ECS_DECLARE_ENTITY(HandleCollisions);
+    ECS_DECLARE_ENTITY(IntegratePositions);
 } Physics;
 
 #define PhysicsImportHandles(handles)\
@@ -23,6 +23,6 @@ typedef struct {
 ECS_IMPORT_COMPONENT(handles, Velocity);\
 ECS_IMPORT_ENTITY(handles, MoveWalk);\
 ECS_IMPORT_ENTITY(handles, UpdateTrackerPos);\
-    ECS_IMPORT_ENTITY(handles, HandleCollisions);\
+ECS_IMPORT_ENTITY(handles, IntegratePositions);\
 
 void PhysicsImport(ecs_world_t *ecs);

code/modules/source/physics.c

@@ -1,23 +1,28 @@
+
 #include "zpl.h"
 #include "modules/physics.h"
 #include "world/world.h"
+#include "world/blocks.h"
+#include "profiler.h"
 
+#define PHY_BLOCK_COLLISION 1
 #define PHY_WALK_DRAG 0.12
+#define PHY_LOOKAHEAD(x) (zpl_sign(x)*16.0f)
+#define PHY_CORRECTION(x) ((zpl_max(0.0f, (WORLD_BLOCK_SIZE/2.0f) - zpl_abs(x))*zpl_sign(x)))*(WORLD_BLOCK_SIZE/2.0f)
 
 void MoveWalk(ecs_iter_t *it) {
-    Position *p = ecs_column(it, Position, 1);
+    Velocity *v = ecs_column(it, Velocity, 1);
-    Velocity *v = ecs_column(it, Velocity, 2);
     
     for (int i = 0; i < it->count; i++) {
-        p[i].x += v[i].x * it->delta_time;
-        p[i].y += v[i].y * it->delta_time;
         v[i].x = zpl_lerp(v[i].x, 0.0f, PHY_WALK_DRAG);
         v[i].y = zpl_lerp(v[i].y, 0.0f, PHY_WALK_DRAG);
     }
 }
 
-void HandleCollisions(ecs_iter_t *it) {
+void IntegratePositions(ecs_iter_t *it) {
+    profile(PROF_INTEGRATE_POS) {
         Position *p = ecs_column(it, Position, 1);
+        Velocity *v = ecs_column(it, Velocity, 2);
         
         for (int i = 0; i < it->count; i++) {
             // NOTE(zaklaus): world bounds
@@ -26,6 +31,30 @@ void HandleCollisions(ecs_iter_t *it) {
                 p[i].x = zpl_clamp(p[i].x, 0, w-1);
                 p[i].y = zpl_clamp(p[i].y, 0, w-1);
             }
+            
+#if PHY_BLOCK_COLLISION==1
+            // NOTE(zaklaus): X axis
+            {
+                world_block_lookup lookup = world_block_from_realpos(p[i].x+PHY_LOOKAHEAD(v[i].x), p[i].y);
+                uint32_t flags = blocks_get_flags(lookup.block_id);
+                if (flags & BLOCK_FLAG_COLLISION) {
+                    v[i].x = PHY_CORRECTION(lookup.ox);
+                }
+            }
+            
+            // NOTE(zaklaus): Y axis
+            {
+                world_block_lookup lookup = world_block_from_realpos(p[i].x, p[i].y+PHY_LOOKAHEAD(v[i].y));
+                uint32_t flags = blocks_get_flags(lookup.block_id);
+                if (flags & BLOCK_FLAG_COLLISION) {
+                    v[i].y = PHY_CORRECTION(lookup.oy);
+                }
+            }
+#endif
+            
+            p[i].x += v[i].x * it->delta_time;
+            p[i].y += v[i].y * it->delta_time;
+        }
     }
 }
 
@@ -47,8 +76,8 @@ void PhysicsImport(ecs_world_t *ecs) {
     
     ECS_META(ecs, Velocity);
     
-    ECS_SYSTEM(ecs, MoveWalk, EcsOnUpdate, general.Position, Velocity);
+    ECS_SYSTEM(ecs, MoveWalk, EcsOnUpdate, Velocity);
-    ECS_SYSTEM(ecs, HandleCollisions, EcsOnValidate, general.Position, Velocity);
+    ECS_SYSTEM(ecs, IntegratePositions, EcsOnValidate, general.Position, Velocity);
     ECS_SYSTEM(ecs, UpdateTrackerPos, EcsPostUpdate, general.Position);
     
     ECS_SET_TYPE(Movement);
@@ -57,5 +86,5 @@ void PhysicsImport(ecs_world_t *ecs) {
     ECS_SET_COMPONENT(Velocity);
     ECS_SET_ENTITY(MoveWalk);
     ECS_SET_ENTITY(UpdateTrackerPos);
-    ECS_SET_ENTITY(HandleCollisions);
+    ECS_SET_ENTITY(IntegratePositions);
 }