From da886760f66bdcb8045d386dcb3ef12c588a3845 Mon Sep 17 00:00:00 2001
From: Matthias Schiffer <matthias@gamezock.de>
Date: Tue, 19 Jan 2010 19:14:13 +0100
Subject: Print info logs when loading shaders

---
 src/de/gamezock/metacraft/ui/ShaderLoader.java | 91 ++++++++++++++++----------
 1 file changed, 58 insertions(+), 33 deletions(-)

diff --git a/src/de/gamezock/metacraft/ui/ShaderLoader.java b/src/de/gamezock/metacraft/ui/ShaderLoader.java
index 25bc4eb..1f696f8 100644
--- a/src/de/gamezock/metacraft/ui/ShaderLoader.java
+++ b/src/de/gamezock/metacraft/ui/ShaderLoader.java
@@ -4,6 +4,8 @@ import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
+import java.nio.ByteBuffer;
+import java.nio.IntBuffer;
 import java.util.AbstractMap;
 import java.util.HashMap;
 import java.util.Map;
@@ -14,6 +16,23 @@ import javax.media.opengl.GL2;
 public class ShaderLoader {
   private static Map<Entry<String, String>, Integer> programs = new HashMap<Entry<String, String>, Integer>();
   
+  static private void printInfoLog(GL2 gl, int object) {
+    IntBuffer lengthBuffer = IntBuffer.allocate(1);
+
+    gl.glGetObjectParameterivARB(object, GL2.GL_OBJECT_INFO_LOG_LENGTH_ARB, lengthBuffer);
+    
+    int length = lengthBuffer.get(0);
+    
+    if(length > 0) {
+      ByteBuffer log = ByteBuffer.allocate(length);
+      
+      IntBuffer foo = IntBuffer.allocate(1);
+      gl.glGetInfoLogARB(object, length, foo, log);
+      System.err.println(new String(log.array()));
+    }
+
+  }
+  
   static private String readStream(InputStream stream) throws IOException {
     BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
     String ret = "", line;
@@ -25,48 +44,54 @@ public class ShaderLoader {
     return ret;
   }
   
-  static boolean load(GL2 gl, String vsName, String fsName) {
+  static private int loadShader(GL2 gl, String name, int type) {
+    int shader = gl.glCreateShaderObjectARB(type);
+    
+    try {
+      InputStream stream = ShaderLoader.class.getResourceAsStream("/de/gamezock/metacraft/resources/shaders/" + name);
+      
+      String source = readStream(stream);
+      
+      gl.glShaderSourceARB(shader, 1, new String[] {source}, null);
+      gl.glCompileShaderARB(shader);
+      
+      printInfoLog(gl, shader);
+      
+      return shader;
+    } catch (IOException e) {
+    }
+    
+    if(shader != 0)
+      gl.glDeleteObjectARB(shader);
+    
+    return 0;
+  }
+  
+  static public 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);
+    int vs = loadShader(gl, vsName, GL2.GL_VERTEX_SHADER);
+    int fs = loadShader(gl, fsName, 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);
+    if(vs != 0 && fs != 0) {
+      int program = gl.glCreateProgramObjectARB();
+      gl.glAttachObjectARB(program, vs);
+      gl.glAttachObjectARB(program, fs);
+      gl.glLinkProgramARB(program);
+      
+      printInfoLog(gl, program);
+      
+      gl.glUseProgramObjectARB(program);
 
-    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);
+      programs.put(new AbstractMap.SimpleEntry<String, String>(vsName, fsName), program);
 
-    int program = gl.glCreateProgram();
-    gl.glAttachShader(program, vs);
-    gl.glAttachShader(program, fs);
-    gl.glLinkProgram(program);
-    gl.glValidateProgram(program);
+      return true;
+    }
 
-    gl.glUseProgram(program);
-    
-    programs.put(new AbstractMap.SimpleEntry<String, String>(vsName, fsName), program);
-    
-    return true;
+    return false;
   }
 }
-- 
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