diff --git a/README.md b/README.md
index 8b7810e19..da0cdbfd4 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ Requires 64 bit processor and operation system.
 |OS|Windows 7/macOS Sierra/Ubuntu 16.04|Windows 10/macOS Big Sur/Linux with Kernel 5.4|
 |CPU|AMD Phenom X4 9600/Intel Core 2 Duo E8400|AMD Ryzen 5 1500X/Intel Core i7-4770K/Apple M1|
 |Memory|4 GB RAM|8 GB RAM|
-|OpenGL|3.2|4.0|
+|OpenGL|3.3|4.0|
 |Graphics|GeForce 9600 GT|Anything that supports OpenGL 4.0|
 |Storage|2 GB available|2 GB available but faster|
 
diff --git a/src/net/torvald/terrarum/App.java b/src/net/torvald/terrarum/App.java
index 430462f49..cfabd7061 100644
--- a/src/net/torvald/terrarum/App.java
+++ b/src/net/torvald/terrarum/App.java
@@ -1671,8 +1671,8 @@ public class App implements ApplicationListener {
             frag = "#version 400\n"+frag0;
         }
         else {
-            vert = "#version 150\n#define fma(a,b,c) (((a)*(b))+(c))\n"+vert0;
-            frag = "#version 150\n#define fma(a,b,c) (((a)*(b))+(c))\n"+frag0;
+            vert = "#version 330\n#define fma(a,b,c) (((a)*(b))+(c))\n"+vert0;
+            frag = "#version 330\n#define fma(a,b,c) (((a)*(b))+(c))\n"+frag0;
         }
 
         ShaderProgram s = new ShaderProgram(vert, frag);
diff --git a/src/net/torvald/terrarum/TerrarumGLinfo.kt b/src/net/torvald/terrarum/TerrarumGLinfo.kt
index 75054bbb5..bbd6d54e5 100644
--- a/src/net/torvald/terrarum/TerrarumGLinfo.kt
+++ b/src/net/torvald/terrarum/TerrarumGLinfo.kt
@@ -7,7 +7,7 @@ import org.lwjgl.opengl.GL11
 class TerrarumGLinfo {
     private var _initialised = false
 
-    val MINIMAL_GL_VERSION = 320
+    val MINIMAL_GL_VERSION = 330
 
     var GL_VERSION = -1; private set
         get() = if (_initialised) field else throw UninitializedPropertyAccessException()
diff --git a/src/net/torvald/terrarum/weather/WeatherObjectCloud.kt b/src/net/torvald/terrarum/weather/WeatherObjectCloud.kt
index 87f2c2e16..ce8569ead 100644
--- a/src/net/torvald/terrarum/weather/WeatherObjectCloud.kt
+++ b/src/net/torvald/terrarum/weather/WeatherObjectCloud.kt
@@ -78,6 +78,13 @@ class WeatherObjectCloud(
 
     private val vecMult = Vector3(1f, 1f, 1f / (4f * H))
 
+    private fun packFloat(f: Float, g: Float): Float {
+        val fi = java.lang.Float.floatToRawIntBits(f)
+        val gi = java.lang.Float.floatToRawIntBits(g)
+        val hi = (fi and 0xffff0000.toInt()) or ((gi and 0xffff0000.toInt()) ushr 16)
+        return java.lang.Float.intBitsToFloat(hi)
+    }
+
     fun render(batch: UnpackedColourSpriteBatch, cloudDrawColour0: Color, shadiness: Float) {
         val sc = screenCoord
 
@@ -87,7 +94,7 @@ class WeatherObjectCloud(
             it.a = alpha
         }
         batch.color = cloudCol
-        batch.generic.set(rgbGamma, aGamma, shadiness, 0f)
+        batch.generic.set(packFloat(rgbGamma, aGamma), shadiness, 0f, 0f)
 
         if (flipW)
             batch.draw(texture, sc.x + texture.regionWidth / posZ, sc.y, -texture.regionWidth * sc.z, texture.regionHeight * sc.z)
diff --git a/src/shaders/clouds.frag b/src/shaders/clouds.frag
index 54963e4b1..e3f266250 100644
--- a/src/shaders/clouds.frag
+++ b/src/shaders/clouds.frag
@@ -2,7 +2,7 @@
 
 
 in vec4 v_color; // lightCol
-in vec4 v_generic; // [rgb gamma, a gamma, shadiness, 0]
+in vec4 v_generic; // [rgb gamma + a gamma, shadiness, 0, 0]
 in vec2 v_texCoords;
 uniform sampler2D u_texture;
 out vec4 fragColor;
@@ -16,9 +16,9 @@ vec4 shadeVec = vec4(1.0 + 3.333 * v_generic.z, 1.0 + 3.333 * v_generic.z, 1.0 +
 
 void main() {
     vec4 cloudCol = v_color;
-    float rgbGamma = v_generic.x;
-    float aGamma = v_generic.y;
-    vec4 gamma = v_generic.xxxy;
+    float rgbGamma = uintBitsToFloat(floatBitsToUint(v_generic.x) & 0xffff0000u);
+    float aGamma = uintBitsToFloat((floatBitsToUint(v_generic.x) & 0x0000ffffu) << 16);
+    vec4 gamma = vec4(rgbGamma, rgbGamma, rgbGamma, aGamma);
 
     vec4 range = vec4(vec3(min(rgbGamma, 1.0 / rgbGamma)), 1.0);
     vec4 offset = vec4(vec3(max(0.0, 1.0 - rgbGamma)), 0.0);