From bfb8b3dc419c9970144ad76e94b7708057cbbf4c Mon Sep 17 00:00:00 2001
From: retrisma <dhvanhise@gmail.com>
Date: Mon, 3 Jun 2024 21:01:51 -0400
Subject: [PATCH] a start on shaders

---
 Tiled/Maps/Exports/slime.lua | 15 ++++++++++++++-
 Tiled/Maps/slime.tmx         |  3 ++-
 camera.lua                   |  3 +++
 main.lua                     | 21 +++++++++++++++++++++
 map.lua                      |  5 ++++-
 shaders.lua                  | 36 ++++++++++++++++++++++++++++++++++++
 6 files changed, 80 insertions(+), 3 deletions(-)
 create mode 100644 shaders.lua

diff --git a/Tiled/Maps/Exports/slime.lua b/Tiled/Maps/Exports/slime.lua
index a60e1e8..8fd2d7f 100644
--- a/Tiled/Maps/Exports/slime.lua
+++ b/Tiled/Maps/Exports/slime.lua
@@ -10,7 +10,7 @@ return {
   tilewidth = 16,
   tileheight = 16,
   nextlayerid = 8,
-  nextobjectid = 73,
+  nextobjectid = 74,
   properties = {},
   tilesets = {
     {
@@ -9249,6 +9249,19 @@ return {
           rotation = 0,
           visible = true,
           properties = {}
+        },
+        {
+          id = 73,
+          name = "light",
+          type = "",
+          shape = "rectangle",
+          x = 608,
+          y = 2177,
+          width = 0,
+          height = 0,
+          rotation = 0,
+          visible = true,
+          properties = {}
         }
       }
     },
diff --git a/Tiled/Maps/slime.tmx b/Tiled/Maps/slime.tmx
index 24700d2..9998f04 100644
--- a/Tiled/Maps/slime.tmx
+++ b/Tiled/Maps/slime.tmx
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<map version="1.10" tiledversion="1.10.2" orientation="orthogonal" renderorder="right-down" width="250" height="170" tilewidth="16" tileheight="16" infinite="0" nextlayerid="8" nextobjectid="73">
+<map version="1.10" tiledversion="1.10.2" orientation="orthogonal" renderorder="right-down" width="250" height="170" tilewidth="16" tileheight="16" infinite="0" nextlayerid="8" nextobjectid="74">
  <editorsettings>
   <export target="Exports/slime.lua" format="lua"/>
  </editorsettings>
@@ -359,6 +359,7 @@
  </layer>
  <objectgroup id="2" name="Object Layer">
   <object id="2" name="animation" x="490.75" y="2133.25"/>
+  <object id="73" name="light" x="608" y="2177"/>
  </objectgroup>
  <objectgroup id="7" name="Triggers">
   <object id="55" name="CamLockY" x="402" y="1942" width="2553.33" height="462"/>
diff --git a/camera.lua b/camera.lua
index b03b280..f095e8a 100644
--- a/camera.lua
+++ b/camera.lua
@@ -62,4 +62,7 @@ function updatecamera(dt)
 
     camera.fx = math.floor(camera.rx)
     camera.fy = math.floor(camera.ry)
+
+    basic.shader:send("camera_pos", {camera.fx, camera.fy})
+    basic.shader:send("camera_scale", camera.scale)
 end
\ No newline at end of file
diff --git a/main.lua b/main.lua
index 985b2b9..0e9dd43 100644
--- a/main.lua
+++ b/main.lua
@@ -11,11 +11,14 @@ require "actor"
 require "player"
 require "triggers"
 require "tools"
+require "shaders"
 require "drawing"
+fmod = require "fmodlove"
 sti = require "lib/sti"
 moonshine = require "lib/moonshine"
 
 window = { width = 800, height = 460, scale = 1.3 }
+canvas = love.graphics.newCanvas(window.width * window.scale, window.height * window.scale)
 
 speed = { target = 1 / 60, multiplier = 1 }
 
@@ -34,6 +37,13 @@ function love.load()
     love.graphics.setDefaultFilter("nearest", "nearest")
 
     loadassets()
+
+    fmod.init(0, 32, 64, 1)
+
+    bi1 = fmod.loadBank("FMOD/Desktop/Master.bank", 0)
+    bi2 = fmod.loadBank("FMOD/Desktop/Master.strings.bank", 0)
+
+    fmod.setNumListeners(1)
     
     font = love.graphics.setFont(fonts["ElixiR"])
     map = loadmap("slime")
@@ -41,6 +51,8 @@ function love.load()
     for _,v in pairs(p) do
         if v.user == "player" then player = v break end
     end
+
+    basic.setup()
 end
 
 function love.update(dt)
@@ -70,11 +82,15 @@ function love.update(dt)
         end
     end
 
+    basic.update()
+
     mouse.op = mouse.p
 end
 
 function love.draw()
     --draw tiled map
+    love.graphics.setCanvas(canvas)
+    love.graphics.clear()
     map:draw(camera.fx * -1, camera.fy * -1, window.scale, window.scale)
 
     love.graphics.push()
@@ -94,6 +110,11 @@ function love.draw()
     love.graphics.circle("fill", mouse.x, mouse.y, 3)
 
     love.graphics.pop()
+    love.graphics.setCanvas()
+
+    love.graphics.setShader(basic.shader)
+    love.graphics.draw(canvas)
+    love.graphics.setShader()
 
     --if showdebug then
         love.graphics.print(printdebug(), 0, 0)
diff --git a/map.lua b/map.lua
index c1b2bc0..e801c6f 100644
--- a/map.lua
+++ b/map.lua
@@ -14,7 +14,10 @@ spawntable = {
         table.insert(p, a)
     end,
 
-
+    light = function(v)
+        local data = getobjectdata(v)
+        table.insert(basic.lights, {data.x, data.y})
+    end,
     CamLockY = function(v)
         local data = getobjectdata(v)
         CameraLockTrigger:add(data.x, data.y, data.width, data.height, false, data.y)
diff --git a/shaders.lua b/shaders.lua
new file mode 100644
index 0000000..d6f3105
--- /dev/null
+++ b/shaders.lua
@@ -0,0 +1,36 @@
+basic = {
+    lights = {}
+}
+
+basic.shader = love.graphics.newShader[[
+    uniform vec2[1] light_pos;
+    uniform vec2 camera_pos;
+    uniform float camera_scale;
+    uniform vec2 player_pos;
+
+    vec2 world_transform(vec2 world_coords) {
+        return (world_coords - camera_pos) * camera_scale;
+    }
+
+    float light_source(vec2 screen_coords, vec2 light, float falloff) {
+        float d = distance(screen_coords, world_transform(light));
+        float intensity = 1.5 - (d / falloff);
+        return clamp(intensity, 1.0, 0.0);
+    }
+
+    vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords) {
+        vec4 pixel = Texel(texture, texture_coords);
+        
+        float intensity = clamp(light_source(screen_coords, light_pos[0], 1000) + light_source(screen_coords, player_pos, 150), 0.4, 1.0);
+
+        return pixel * intensity;
+    }
+]]
+
+function basic.setup()
+    basic.shader:send("light_pos", unpack(basic.lights))
+end
+
+function basic.update()
+    basic.shader:send("player_pos", {player.x + player.width / 2, player.y + player.height / 2})
+end
\ No newline at end of file