From 4d7dcc17bbbdbdfeb413794d23238b6b737653e8 Mon Sep 17 00:00:00 2001
From: shadowislord <shadowislord@gmail.com>
Date: Tue, 4 Nov 2014 16:27:14 -0500
Subject: [PATCH]  * Don't depend on ContextCapabilities for determining OGL /
 GLSL versions

---
 .../jme3/renderer/lwjgl/LwjglRenderer.java    | 91 +++++++++++--------
 1 file changed, 54 insertions(+), 37 deletions(-)

diff --git a/jme3-lwjgl/src/main/java/com/jme3/renderer/lwjgl/LwjglRenderer.java b/jme3-lwjgl/src/main/java/com/jme3/renderer/lwjgl/LwjglRenderer.java
index 1a616fc92..f3ef9055c 100644
--- a/jme3-lwjgl/src/main/java/com/jme3/renderer/lwjgl/LwjglRenderer.java
+++ b/jme3-lwjgl/src/main/java/com/jme3/renderer/lwjgl/LwjglRenderer.java
@@ -148,18 +148,56 @@ public class LwjglRenderer implements Renderer {
         return caps;
     }
 
+    private static int extractVersion(String prefixStr, String versionStr) {
+        if (versionStr != null) {
+            int spaceIdx = versionStr.indexOf(" ", prefixStr.length());
+            if (spaceIdx >= 1) {
+                versionStr = versionStr.substring(prefixStr.length(), spaceIdx).trim();
+            } else {
+                versionStr = versionStr.substring(prefixStr.length()).trim();
+            }
+            // Some device have ":" at the end of the version.
+            versionStr = versionStr.replaceAll("\\:", "");
+            
+            // Pivot on first point.
+            int firstPoint = versionStr.indexOf(".");
+            
+            // Remove everything after second point.
+            int secondPoint = versionStr.indexOf(".", firstPoint + 1);
+            
+            if (secondPoint != -1) {
+                versionStr = versionStr.substring(0, secondPoint);
+            }
+            
+            String majorVerStr = versionStr.substring(0, firstPoint);
+            String minorVerStr = versionStr.substring(firstPoint + 1);
+            
+            if (minorVerStr.endsWith("0") && minorVerStr.length() > 1) {
+                minorVerStr = minorVerStr.substring(0, minorVerStr.length() - 1);
+            }
+            
+            int majorVer = Integer.parseInt(majorVerStr);
+            int minorVer = Integer.parseInt(minorVerStr);
+            
+            return majorVer * 100 + minorVer * 10;
+        } else {
+            return -1;
+        }
+    }
+    
     @SuppressWarnings("fallthrough")
     public void initialize() {
-        ctxCaps = GLContext.getCapabilities();
-        if (ctxCaps.OpenGL20) {
+        int oglVer  = extractVersion("", glGetString(GL_VERSION));
+        
+        if (oglVer >= 200) {
             caps.add(Caps.OpenGL20);
-            if (ctxCaps.OpenGL21) {
+            if (oglVer >= 210) {
                 caps.add(Caps.OpenGL21);
-                if (ctxCaps.OpenGL30) {
+                if (oglVer >= 300) {
                     caps.add(Caps.OpenGL30);
-                    if (ctxCaps.OpenGL31) {
+                    if (oglVer >= 310) {
                         caps.add(Caps.OpenGL31);
-                        if (ctxCaps.OpenGL32) {
+                        if (oglVer >= 320) {
                             caps.add(Caps.OpenGL32);
                         }
                     }
@@ -167,20 +205,6 @@ public class LwjglRenderer implements Renderer {
             }
         }
         
-        //workaround, always assume we support GLSL100
-        //some cards just don't report this correctly
-        caps.add(Caps.GLSL100);
-        
-        String versionStr = null;
-        if (ctxCaps.OpenGL20) {
-            versionStr = glGetString(GL_SHADING_LANGUAGE_VERSION);
-        }
-        if (versionStr == null || versionStr.equals("")) {
-            throw new UnsupportedOperationException("GLSL and OpenGL2 is "
-                    + "required for the LWJGL "
-                    + "renderer!");
-        }
-
         // Fix issue in TestRenderToMemory when GL_FRONT is the main
         // buffer being used.
         context.initialDrawBuf = glGetInteger(GL_DRAW_BUFFER);
@@ -192,23 +216,15 @@ public class LwjglRenderer implements Renderer {
 //        initialDrawBuf = GL_BACK;
 //        initialReadBuf = GL_BACK;
 
-        int spaceIdx = versionStr.indexOf(" ");
-        if (spaceIdx >= 1) {
-            versionStr = versionStr.substring(0, spaceIdx);
-        }
-
-        float version = Float.parseFloat(versionStr);
-        int glslVer = (int) (version * 100);
-
+        int glslVer = extractVersion("", glGetString(GL_SHADING_LANGUAGE_VERSION));
+        
         switch (glslVer) {
             default:
                 if (glslVer < 400) {
                     break;
                 }
-
-            // so that future OpenGL revisions wont break jme3
-
-            // fall through intentional
+                // so that future OpenGL revisions wont break jme3
+                // fall through intentional
             case 400:
             case 330:
             case 150:
@@ -225,12 +241,13 @@ public class LwjglRenderer implements Renderer {
                 caps.add(Caps.GLSL100);
                 break;
         }
+        
+        // Workaround, always assume we support GLSL100.
+        // Some cards just don't report this correctly.
+        caps.add(Caps.GLSL100);
 
-        if (!caps.contains(Caps.GLSL100)) {
-            logger.log(Level.WARNING, "Force-adding GLSL100 support, since OpenGL2 is supported.");
-            caps.add(Caps.GLSL100);
-        }
-
+        ctxCaps = GLContext.getCapabilities();
+        
         glGetInteger(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, intBuf16);
         vertexTextureUnits = intBuf16.get(0);
         logger.log(Level.FINER, "VTF Units: {0}", vertexTextureUnits);