v0.4.2: Implemented no-lighting shader

Gives a very big performance boost on older devices
2016-09-05 01:32:19 -04:00
parent 182b24d9ae
commit 6ed1ec2214
8 changed files with 120 additions and 13 deletions
@@ -0,0 +1,80 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2015  Oleg Dolya
+ *
+ * Shattered Pixel Dungeon
+ * Copyright (C) 2014-2016 Evan Debenham
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package com.watabou.noosa;
+
+import com.watabou.glscripts.Script;
+
+//This class should be used on heavy pixel-fill based loads when lighting is not needed.
+// It skips the lighting component of the fragment shader, giving a significant performance boost
+
+//Remember that switching programs is expensive
+// if this script is to be used many times try to block them together
+public class NoosaScriptNoLighting extends NoosaScript {
+
+	public NoosaScriptNoLighting() {
+
+		compile( shader() );
+
+		//we can use the same components as regular noosascript
+		NoosaScript n = NoosaScript.get();
+		uCamera	= n.uCamera;
+		uModel	= n.uModel;
+		uTex	= n.uTex;
+		aXY		= n.aXY;
+		aUV		= n.aUV;
+
+	}
+
+	@Override
+	public void lighting(float rm, float gm, float bm, float am, float ra, float ga, float ba, float aa) {
+		//Does nothing
+	}
+
+	public static NoosaScriptNoLighting get(){
+		return Script.use( NoosaScriptNoLighting.class );
+	}
+
+	@Override
+	protected String shader() {
+		return SHADER;
+	}
+
+	private static final String SHADER =
+
+			"uniform mat4 uCamera;" +
+			"uniform mat4 uModel;" +
+			"attribute vec4 aXYZW;" +
+			"attribute vec2 aUV;" +
+			"varying vec2 vUV;" +
+			"void main() {" +
+			"  gl_Position = uCamera * uModel * aXYZW;" +
+			"  vUV = aUV;" +
+			"}" +
+
+			"//\n" +
+
+			"varying mediump vec2 vUV;" +
+			"uniform lowp sampler2D uTex;" +
+			"void main() {" +
+			"  gl_FragColor = texture2D( uTex, vUV );" +
+			"}";
+}