From 707c5557e471836c7c12413d54abcee212a63e7e Mon Sep 17 00:00:00 2001
From: Thyme1 <konrad1jasinski@gmail.com>
Date: Thu, 30 Dec 2021 18:06:40 +0100
Subject: [PATCH] add specular lighting based on cw5 earlier shaders

---
 grafika_projekt/shaders/shader_tex.frag | 15 ++++++++++++---
 grafika_projekt/shaders/shader_tex.vert |  2 ++
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/grafika_projekt/shaders/shader_tex.frag b/grafika_projekt/shaders/shader_tex.frag
index 6ea96e2..5ec1fe9 100644
--- a/grafika_projekt/shaders/shader_tex.frag
+++ b/grafika_projekt/shaders/shader_tex.frag
@@ -1,17 +1,26 @@
 #version 410 core
 
 uniform sampler2D textureSampler;
-uniform vec3 lightDir;
+//uniform vec3 lightDir;
+uniform vec3 lightPos;
+uniform vec3 cameraPos;
+uniform vec3 objectColor;
 
+in vec3 fragPos;
 in vec3 interpNormal;
 in vec2 interpTexCoord;
 
 void main()
 {
+	vec3 lightDir = normalize(lightPos-fragPos);
+	vec3 V = normalize(cameraPos-fragPos);
 	vec2 modifiedTexCoord = vec2(interpTexCoord.x, 1.0 - interpTexCoord.y); // Poprawka dla tekstur Ziemi, ktore bez tego wyswietlaja sie 'do gory nogami'
 	vec3 color = texture2D(textureSampler, modifiedTexCoord).rgb;
 	vec3 normal = normalize(interpNormal);
+	float diffuse = max(0,dot(normal,normalize(lightDir)));
+	vec3 R = reflect(-normalize(lightDir),normal);
 	float ambient = 0.2;
-	float diffuse = max(dot(normal, -lightDir), 0.1);
-	gl_FragColor = vec4(color * (ambient + (1-ambient) * diffuse * 0.6 ), 1.0);
+	float specular = pow(max(0,dot(R,V)),1000);
+	gl_FragColor = vec4(color*(ambient + (1-ambient)*diffuse)+vec3(1)*specular*0.2, 1.0);
+	
 }
diff --git a/grafika_projekt/shaders/shader_tex.vert b/grafika_projekt/shaders/shader_tex.vert
index c0e1d86..b289b49 100644
--- a/grafika_projekt/shaders/shader_tex.vert
+++ b/grafika_projekt/shaders/shader_tex.vert
@@ -9,10 +9,12 @@ uniform mat4 modelMatrix;
 
 out vec3 interpNormal;
 out vec2 interpTexCoord;
+out vec3 fragPos;
 
 void main()
 {
 	gl_Position = modelViewProjectionMatrix * vec4(vertexPosition, 1.0);
 	interpNormal = (modelMatrix * vec4(vertexNormal, 0.0)).xyz;
+	fragPos = (modelMatrix*vec4(vertexPosition,1)).xyz;
 	interpTexCoord = vertexTexCoord;
 }