From b92c9d17efff6340dad64bd920900a130166ae11 Mon Sep 17 00:00:00 2001
From: 0undefined <oscar@nelin.dk>
Date: Tue, 11 Nov 2025 00:17:37 +0100
Subject: Add some lighting

Ambient & Diffuse, shadowmapping et. al. TBD
---
 resources/shader.frag | 17 ++++++++++++++++-
 resources/shader.vert | 13 ++++++-------
 2 files changed, 22 insertions(+), 8 deletions(-)

(limited to 'resources')

diff --git a/resources/shader.frag b/resources/shader.frag
index f81277d..0b81464 100644
--- a/resources/shader.frag
+++ b/resources/shader.frag
@@ -2,10 +2,25 @@
 
 // Ouput data
 in vec2 UV;
+in vec3 FragmentPos;
+in vec3 Normal;
 out vec3 color;
 
 uniform sampler2D textureSampler;
 
 void main() {
-  color = texture(textureSampler, UV).rgb;
+  vec3 light_color_ambient = vec3(0.4, 0.6, 0.9);
+  vec3 light_color_diffuse = vec3(0.8, 1.0, 1.0);
+
+  vec3 lightpos = vec3(16, 26, 32);
+
+  float ambient_strength = 0.3;
+  vec3 ambient = ambient_strength * light_color_ambient;
+
+  vec3 norm = normalize(Normal);
+  vec3 light_dir = normalize(lightpos - FragmentPos);
+
+  float diff = max(dot(norm, light_dir), 0.0);
+  vec3 diffuse = diff * light_color_diffuse;
+  color = (ambient + diffuse) * texture(textureSampler, UV).rgb;
 }
diff --git a/resources/shader.vert b/resources/shader.vert
index e5aff9a..50e8218 100644
--- a/resources/shader.vert
+++ b/resources/shader.vert
@@ -3,21 +3,20 @@
 // Input vertex data, different for all executions of this shader.
 layout(location = 0) in vec3 vertexPosition_modelspace;
 layout(location = 1) in vec2 vertexUV;
+layout(location = 2) in vec3 vNorm;
 
 out vec2 UV;
+out vec3 FragmentPos;
+out vec3 Normal;
 
 uniform mat4 MVP;
+uniform mat4 modelPosition;
 
 void main() {
 
     gl_Position = MVP * vec4(vertexPosition_modelspace, 1);
 
     UV = vertexUV;
-
-    //fragmentcolor.x = vertexPosition_modelspace.x; //= vertexColor;
-    //fragmentcolor.y = vertexPosition_modelspace.y; //= vertexColor;
-    //fragmentcolor.z = vertexPosition_modelspace.z; //= vertexColor;
-
-    //fragmentcolor += 1;
-    //fragmentcolor /= 2;
+    FragmentPos = vec3(modelPosition * vec4(vertexPosition_modelspace,1));
+    Normal = vNorm;
 }
-- 
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