From c7030ae2b41fc2e559304737a54d6f927cf3d740 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Tue, 19 Jan 2010 01:09:01 +0100
Subject: Added shader loader (and default shaders)

---
 src/de/gamezock/metacraft/ui/ShaderLoader.java | 72 ++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/de/gamezock/metacraft/ui/ShaderLoader.java

(limited to 'src/de/gamezock/metacraft/ui/ShaderLoader.java')

diff --git a/src/de/gamezock/metacraft/ui/ShaderLoader.java b/src/de/gamezock/metacraft/ui/ShaderLoader.java
new file mode 100644
index 0000000..25bc4eb
--- /dev/null
+++ b/src/de/gamezock/metacraft/ui/ShaderLoader.java
@@ -0,0 +1,72 @@
+package de.gamezock.metacraft.ui;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.AbstractMap;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import javax.media.opengl.GL2;
+
+public class ShaderLoader {
+  private static Map<Entry<String, String>, Integer> programs = new HashMap<Entry<String, String>, Integer>();
+  
+  static private String readStream(InputStream stream) throws IOException {
+    BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
+    String ret = "", line;
+    
+    while ((line = reader.readLine()) != null) {
+      ret += line + "\n";
+    }
+    
+    return ret;
+  }
+  
+  static boolean load(GL2 gl, String vsName, String fsName) {
+    Integer savedProg = programs.get(new AbstractMap.SimpleEntry<String, String>(vsName, fsName));
+    if(savedProg != null) {
+      gl.glUseProgram(savedProg);
+      return true;
+    }
+    
+    int vs = gl.glCreateShader(GL2.GL_VERTEX_SHADER);
+    int fs = gl.glCreateShader(GL2.GL_FRAGMENT_SHADER);
+    
+    InputStream vsStream = ShaderLoader.class.getResourceAsStream("/de/gamezock/metacraft/resources/shaders/" + vsName);
+    String vsSource;
+    try {
+      vsSource = readStream(vsStream);
+    } catch (IOException e) {
+      return false;
+    }
+    
+    gl.glShaderSource(vs, 1, new String[] {vsSource}, null);
+    gl.glCompileShader(vs);
+
+    InputStream fsStream = ShaderLoader.class.getResourceAsStream("/de/gamezock/metacraft/resources/shaders/" + fsName);
+    String fsSource;
+    try {
+      fsSource = readStream(fsStream);
+    } catch (IOException e) {
+      return false;
+    }
+    
+    gl.glShaderSource(fs, 1, new String[] {fsSource}, null);
+    gl.glCompileShader(fs);
+
+    int program = gl.glCreateProgram();
+    gl.glAttachShader(program, vs);
+    gl.glAttachShader(program, fs);
+    gl.glLinkProgram(program);
+    gl.glValidateProgram(program);
+
+    gl.glUseProgram(program);
+    
+    programs.put(new AbstractMap.SimpleEntry<String, String>(vsName, fsName), program);
+    
+    return true;
+  }
+}
-- 
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