From e5acfb329827802fe2259f91701dc8762c2573b6 Mon Sep 17 00:00:00 2001
From: nathan <nathansmith@disroot.org>
Date: Fri, 8 Aug 2025 12:48:10 -0600
Subject: Mesh instancing test working

---
 src/assets.c |  3 ++-
 src/assets.h |  7 ++++---
 src/entity.c |  2 ++
 src/game.c   |  2 +-
 src/world.c  | 27 ++++++++++++++++++++++++---
 src/world.h  |  4 ++--
 6 files changed, 35 insertions(+), 10 deletions(-)

(limited to 'src')

diff --git a/src/assets.c b/src/assets.c
index 09388b8..1da7197 100644
--- a/src/assets.c
+++ b/src/assets.c
@@ -13,7 +13,8 @@ const char imageAssetPaths[IMAGE_ASSET_COUNT][FT_NAMEMAX] = {
 };
 
 const char shaderAssetNames[SHADER_ASSET_COUNT][FT_NAMEMAX] = {
-  "skybox"
+  "skybox",
+  "instancing"
 };
 
 const char modelAssetPaths[MODEL_ASSET_COUNT][FT_NAMEMAX] = {
diff --git a/src/assets.h b/src/assets.h
index 2457115..de849b0 100644
--- a/src/assets.h
+++ b/src/assets.h
@@ -5,7 +5,7 @@
 
 #define TEXTURE_ASSET_COUNT 5
 #define IMAGE_ASSET_COUNT 1
-#define SHADER_ASSET_COUNT 1
+#define SHADER_ASSET_COUNT 2
 #define MODEL_ASSET_COUNT 1
 
 extern const char textureAssetPaths[TEXTURE_ASSET_COUNT][FT_NAMEMAX];
@@ -26,12 +26,13 @@ enum {
 
 // Image asset ids.
 enum {
-  SKYBOX_IMAGE
+  SKYBOX_IMAGE,
 };
 
 // Shader asset ids.
 enum {
-  SKYBOX_SHADER
+  SKYBOX_SHADER,
+  INSTANCING_SHADER
 };
 
 // Model asset ids.
diff --git a/src/entity.c b/src/entity.c
index c63acf4..0fb784e 100644
--- a/src/entity.c
+++ b/src/entity.c
@@ -95,6 +95,8 @@ void updateEntity(Entity* entity, Game* game)
     /*                              (Vector3){0.0, UTILITY_POLE_HEIGHT}), */
     /*              UTILITY_POLE_RADIUS, UTILITY_POLE_RADIUS, */
     /*              UTILITY_POLE_HEIGHT * 2.0, 6, BROWN); */
+    /* DrawModel(game->assets.models[UTILITY_POLE_MODEL], entity->position, 1.0, */
+    /*           BROWN); */
     break;
   default:
     break;
diff --git a/src/game.c b/src/game.c
index e4d74ff..0d1fa79 100644
--- a/src/game.c
+++ b/src/game.c
@@ -30,7 +30,7 @@ void initGame(Game* game)
                        CUBEMAP_LAYOUT_AUTO_DETECT);
 
   // World.
-  game->world = createWorld(345893);
+  game->world = createWorld(345893, &game->assets);
 
   // Player.
   game->player = createPlayer();
diff --git a/src/world.c b/src/world.c
index 828aaa3..a5af6e7 100644
--- a/src/world.c
+++ b/src/world.c
@@ -473,8 +473,28 @@ Seed generateWorldPlants(World* world, Seed seed, int start, int end)
   return seed;
 }
 
-Seed generateWorldUtilityPoles(World* world, Seed seed, int start, int end)
+Seed generateWorldUtilityPoles(World* world, const Assets* assets, Seed seed,
+                               int start, int end)
 {
+  world->utilityPoleTransforms = (Matrix*)FT_CALLOC(WORLD_UTILITY_POLE_COUNT,
+                                                    sizeof(Matrix));
+
+  if (world->utilityPoleTransforms == NULL)
+  {
+    ALLOCATION_ERROR;
+    return seed;
+  }
+
+  // Instancing shader.
+  Shader shader = assets->shaders[INSTANCING_SHADER];
+  shader.locs[SHADER_LOC_MATRIX_MVP] = GetShaderLocation(shader, "mvp");
+  shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocationAttrib(shader,
+                                                                 "instance");
+  shader.locs[SHADER_LOC_MATRIX_VIEW] = GetShaderLocation(shader, "view");
+  shader.locs[SHADER_LOC_MATRIX_PROJECTION] = GetShaderLocation(shader,
+                                                                "projection");
+  assets->models[UTILITY_POLE_MODEL].materials[0].shader = shader;
+  
   for (int index = start; index < end; ++index)
   {
     FT_RANDOM16(seed);
@@ -523,7 +543,7 @@ Texture generateGroundTexture()
   return texture;
 }
 
-World createWorld(Seed seed)
+World createWorld(Seed seed, const Assets* assets)
 {
   World world;
   world.size = WORLD_SIZE;
@@ -573,7 +593,7 @@ World createWorld(Seed seed)
   // Utility poles.
   start = end;
   end = WORLD_UTILITY_POLE_COUNT + start;
-  seed = generateWorldUtilityPoles(&world, seed, start, end);
+  seed = generateWorldUtilityPoles(&world, assets, seed, start, end);
 
   // Items.
   start = end;
@@ -655,6 +675,7 @@ void freeWorld(World world)
   UnloadTexture(
     world.heightmap.materials[0].maps[MATERIAL_MAP_DIFFUSE].texture);
   UnloadModel(world.heightmap);
+  FT_FREE(world.utilityPoleTransforms);
   freeWorldBVH(world.bvh);
 }
 
diff --git a/src/world.h b/src/world.h
index fc84ca3..21e4c4c 100644
--- a/src/world.h
+++ b/src/world.h
@@ -58,12 +58,12 @@ struct World {
   BVHNode bvh;
 
   // Transforms for mesh instancing.
-  Matrix utilityPoleTransforms[WORLD_UTILITY_POLE_COUNT];
+  Matrix* utilityPoleTransforms;
 
   int bvhDebugSelect;
 };
 
-World createWorld(Seed seed);
+World createWorld(Seed seed, const Assets* assets);
 void updateWorld(World* world, Game* game);
 void freeWorld(World world);
 // Dam, I wanta live in a free world ):
-- 
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