From 376c26aae6d27643280e0561147ef6babbd1dc46 Mon Sep 17 00:00:00 2001
From: Emil Kosz <ekosz@int.pl>
Date: Wed, 4 Jun 2025 20:58:30 +0200
Subject: [PATCH] Cloud shader fix, entity waving effect

---
 game/res/shaders/clouds.frag  |  2 +-
 game/res/shaders/clouds.vert  |  4 +++-
 game/res/shaders/default.vert | 19 ++++++++++++++++++-
 game/src/chunk/chunkman.h     |  2 +-
 game/src/entity/entity.h      |  1 +
 game/src/entity/entman.c      | 17 +++++++++++++----
 game/src/entity/templates.c   |  2 ++
 game/src/state.c              |  4 +++-
 8 files changed, 42 insertions(+), 9 deletions(-)

diff --git a/game/res/shaders/clouds.frag b/game/res/shaders/clouds.frag
index 18447de..bbf83b7 100644
--- a/game/res/shaders/clouds.frag
+++ b/game/res/shaders/clouds.frag
@@ -13,5 +13,5 @@ void main ()
       discard;
     }
   
-  gl_FragColor = texture2D (texture, f_uv);
+  gl_FragColor = vec4 (0.7, 0.7, 0.7, 1.0);
 }
diff --git a/game/res/shaders/clouds.vert b/game/res/shaders/clouds.vert
index de17b21..bf6b552 100644
--- a/game/res/shaders/clouds.vert
+++ b/game/res/shaders/clouds.vert
@@ -12,6 +12,8 @@ varying vec2 f_uv;
 
 void main ()
 {
-  f_uv = (uv * 20.0) + (time * 20.0);
+  /* Because the UVs go from 0 to 1, and I CBA to wrap textures, we
+     gotta mod it. */
+  f_uv = (uv * 20.0) + vec2 (mod(time * 0.000003, 1.0), mod(time * 0.000002, 1.0));
   gl_Position = projection * view * model * position;
 }
diff --git a/game/res/shaders/default.vert b/game/res/shaders/default.vert
index 21ce9f3..b539105 100644
--- a/game/res/shaders/default.vert
+++ b/game/res/shaders/default.vert
@@ -7,10 +7,27 @@ uniform mat4 view;
 uniform mat4 projection;
 uniform mat4 model;
 
+uniform float time;
+uniform bool wavy;
+
 varying vec2 f_uv;
 
 void main ()
 {
   f_uv = uv;
-  gl_Position = projection * view * model * position;
+
+  vec4 pos = position;
+
+  if (wavy)
+    {
+      vec2 center = vec2 (0.5, 0.5);
+      vec2 local = pos.xz - center;
+      
+      local.x += sin(local.x * time * 0.001) / 64.0;
+      local.y += cos(local.y * time * 0.001) / 64.0;
+      
+      pos.xz = local + center;      
+    }
+  
+  gl_Position = projection * view * model * pos;
 }
diff --git a/game/src/chunk/chunkman.h b/game/src/chunk/chunkman.h
index 316b413..ac26702 100644
--- a/game/src/chunk/chunkman.h
+++ b/game/src/chunk/chunkman.h
@@ -9,7 +9,7 @@
 #include "../entity/entman.h"
 #include "../entity/templates.h"
 
-#define RENDER_DISTANCE 6
+#define RENDER_DISTANCE 4
 
 void chunkman_init ();
 void chunkman_update (vec3 camera_position);
diff --git a/game/src/entity/entity.h b/game/src/entity/entity.h
index dbfe4cd..f77e5b9 100644
--- a/game/src/entity/entity.h
+++ b/game/src/entity/entity.h
@@ -12,6 +12,7 @@ typedef struct Entity
   enum { RENDER_NORMAL, RENDER_BILLBOARD_Y, RENDER_BILLBOARD } render_type;
   bool visible;
   bool dont_cull;
+  bool wavy;
   
   void *userdata;
   
diff --git a/game/src/entity/entman.c b/game/src/entity/entman.c
index bbc03e8..c1b0bf4 100644
--- a/game/src/entity/entman.c
+++ b/game/src/entity/entman.c
@@ -7,7 +7,7 @@
 extern vec3 camera_position;
 extern int last_time;
 
-Entity *player_entity;
+Entity *player_entity, *sky_entity;
 
 static GSequence *entities;
 static EntityMesh mesh_quad1, mesh_quad2, mesh_quad_x;
@@ -40,8 +40,8 @@ entman_init ()
 
   ENTADD (player_entity);
 
-  Entity *sky = malloc (sizeof (Entity));
-  *sky = (Entity) {
+  sky_entity = malloc (sizeof (Entity));
+  *sky_entity = (Entity) {
     .mesh_type = MESH_QUAD1,
     .origin = ORIGIN_CENTER,
     .visible = true,
@@ -53,7 +53,7 @@ entman_init ()
     .program = RESPRG ("clouds")
   };
 
-  ENTADD (sky);
+  ENTADD (sky_entity);
 }
 
 void
@@ -184,6 +184,15 @@ entman_render_internal (gpointer data, gpointer userdata)
   program_set_mat4 (entity->program, "model", model);
   program_set_float (entity->program, "time", last_time);
 
+  if (entity->wavy)
+    {
+      program_set_float (entity->program, "wavy", true);
+    }
+  else
+    {
+      program_set_float (entity->program, "wavy", false);
+    }
+
   if (entity->texture != last_texture)
     {
       glActiveTexture (GL_TEXTURE0);
diff --git a/game/src/entity/templates.c b/game/src/entity/templates.c
index afa7f6b..ceec908 100644
--- a/game/src/entity/templates.c
+++ b/game/src/entity/templates.c
@@ -23,6 +23,7 @@ ent_templates_init ()
   *tree = (Entity) {
     .mesh_type = MESH_QUAD_X,
     .visible = true,
+    .wavy = true,
     .origin = ORIGIN_BOTTOM,
     .position = { 0.0 },
     .scale = { 3.0, 8.0, 3.0 },
@@ -38,6 +39,7 @@ ent_templates_init ()
     .mesh_type = MESH_QUAD1,
     .render_type = RENDER_BILLBOARD_Y,
     .visible = true,
+    .wavy = true,
     .origin = ORIGIN_BOTTOM,
     .position = { 0.0 },
     .scale = { 1.0, 0.5, 1.0 },
diff --git a/game/src/state.c b/game/src/state.c
index 5b8b491..c77a7e6 100644
--- a/game/src/state.c
+++ b/game/src/state.c
@@ -1,7 +1,7 @@
 #include "state.h"
 
 extern vec3 camera_position;
-extern Entity *player_entity;
+extern Entity *player_entity, *sky_entity;
 
 float delta_time;
 int last_time;
@@ -21,6 +21,8 @@ game_state_tick (int ticks)
 
   glm_vec3_copy (player_entity->position, camera_position);
   camera_position[1] += player_entity->scale[1] - 0.2;
+  sky_entity->position[0] = camera_position[0];
+  sky_entity->position[2] = camera_position[2];
   
   if (flags_get ("moving_forward"))
     {