fix precision and attribute types

Author: mikolalysenko

exercises/light-1/files/fragment.glsl

@@ -1,4 +1,4 @@
-precision highp float;
+precision mediump float;
 
 uniform mat4 model, view, projection;
 uniform vec3 ambient;

exercises/light-1/files/vertex.glsl

@@ -1,9 +1,9 @@
-precision highp float;
+precision mediump float;
 
-attribute vec4 position;
+attribute vec3 position;
 uniform mat4 model, view, projection;
 uniform vec3 ambient;
 
 void main() {
-  gl_Position = position;
+  gl_Position = vec4(position, 1);
 }

exercises/light-3/files/fragment.glsl

@@ -1,4 +1,4 @@
-precision highp float;
+precision mediump float;
 
 uniform mat4 model, view, projection;
 uniform mat4 inverseModel, inverseView, inverseProjection;

exercises/light-3/files/vertex.glsl

@@ -1,11 +1,11 @@
-precision highp float;
+precision mediump float;
 
-attribute vec4 position, normal;
+attribute vec3 position, normal;
 uniform mat4 model, view, projection;
 uniform mat4 inverseModel, inverseView, inverseProjection;
 uniform vec3 ambient, diffuse, specular, lightDirection;
 uniform float shininess;
 
 void main() {
-  gl_Position = position;
+  gl_Position = vec4(position, 1);
 }