From 6eaf11cc02e841d7d7b896a9577bf59315e2490a Mon Sep 17 00:00:00 2001
From: Evert Prants <imsonotsleepy@gmail.com>
Date: Tue, 31 Dec 2019 22:09:10 +0200
Subject: [PATCH] Reduce environment lights for older gles even further

---
 assets/shaders/terrain.fs | 8 ++++----
 assets/shaders/terrain.vs | 6 +++---
 src/engine/environment.js | 2 +-
 3 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/assets/shaders/terrain.fs b/assets/shaders/terrain.fs
index 0b82eb5..da14641 100644
--- a/assets/shaders/terrain.fs
+++ b/assets/shaders/terrain.fs
@@ -1,13 +1,13 @@
 precision highp float;
 
 varying vec2 uv;
-varying vec3 toLightVector[5];
+varying vec3 toLightVector[4];
 varying vec3 surfaceNormal;
 varying vec3 toCameraVector;
 
 uniform sampler2D texture0;
-uniform vec3 lightColor[5];
-uniform vec3 attenuation[5];
+uniform vec3 lightColor[4];
+uniform vec3 attenuation[4];
 
 void main() {
 	float reflectivity = 0.0;
@@ -19,7 +19,7 @@ void main() {
 	vec3 totalDiffuse = vec3(0.0);
 	vec3 totalSpecular = vec3(0.0);
 
-	for(int i=0;i<5;i++){
+	for(int i=0;i<4;i++){
 		float distance = length(toLightVector[i]);
 		float attFactor = attenuation[i].x + (attenuation[i].y * distance) + (attenuation[i].z * distance * distance);
 		vec3 unitLightVector = normalize(toLightVector[i]);
diff --git a/assets/shaders/terrain.vs b/assets/shaders/terrain.vs
index 32d5b08..6521967 100644
--- a/assets/shaders/terrain.vs
+++ b/assets/shaders/terrain.vs
@@ -7,10 +7,10 @@ attribute vec2 aTexCoords;
 uniform mat4 uModelMatrix;
 uniform mat4 uViewMatrix;
 uniform mat4 uProjectionMatrix;
-uniform vec3 lightPosition[5];
+uniform vec3 lightPosition[4];
 
 varying vec2 uv;
-varying vec3 toLightVector[5];
+varying vec3 toLightVector[4];
 varying vec3 surfaceNormal;
 varying vec3 toCameraVector;
 
@@ -60,7 +60,7 @@ void main() {
 	gl_Position = uProjectionMatrix * uViewMatrix * worldPosition;
 	uv = aTexCoords;
 	surfaceNormal = (uModelMatrix * vec4(aNormal,0.0)).xyz;
-	for(int i=0;i<5;i++){
+	for(int i=0;i<4;i++){
 		toLightVector[i] = lightPosition[i] - worldPosition.xyz;
 	}
 	toCameraVector = (inverse(uViewMatrix) * vec4(0.0,0.0,0.0,1.0)).xyz - worldPosition.xyz;
diff --git a/src/engine/environment.js b/src/engine/environment.js
index 54f6e26..7c884f0 100644
--- a/src/engine/environment.js
+++ b/src/engine/environment.js
@@ -1,5 +1,5 @@
 
-const ENV_MAX_LIGHTS = 5
+const ENV_MAX_LIGHTS = 4
 
 class Light {
   constructor (pos, color, attenuation = [1.0, 0.0, 0.0]) {