CatServer/patches/net/minecraft/client/shader/Framebuffer.java.patch

--- ../src-base/minecraft/net/minecraft/client/shader/Framebuffer.java
+++ ../src-work/minecraft/net/minecraft/client/shader/Framebuffer.java
@@ -118,8 +118,17 @@
             if (this.useDepth)
             {
                 OpenGlHelper.glBindRenderbuffer(OpenGlHelper.GL_RENDERBUFFER, this.depthBuffer);
+                if (!this.stencilEnabled)
+                {
                 OpenGlHelper.glRenderbufferStorage(OpenGlHelper.GL_RENDERBUFFER, 33190, this.framebufferTextureWidth, this.framebufferTextureHeight);
                 OpenGlHelper.glFramebufferRenderbuffer(OpenGlHelper.GL_FRAMEBUFFER, OpenGlHelper.GL_DEPTH_ATTACHMENT, OpenGlHelper.GL_RENDERBUFFER, this.depthBuffer);
+                }
+                else
+                {
+                    OpenGlHelper.glRenderbufferStorage(OpenGlHelper.GL_RENDERBUFFER, org.lwjgl.opengl.EXTPackedDepthStencil.GL_DEPTH24_STENCIL8_EXT, this.framebufferTextureWidth, this.framebufferTextureHeight);
+                    OpenGlHelper.glFramebufferRenderbuffer(OpenGlHelper.GL_FRAMEBUFFER, org.lwjgl.opengl.EXTFramebufferObject.GL_DEPTH_ATTACHMENT_EXT, OpenGlHelper.GL_RENDERBUFFER, this.depthBuffer);
+                    OpenGlHelper.glFramebufferRenderbuffer(OpenGlHelper.GL_FRAMEBUFFER, org.lwjgl.opengl.EXTFramebufferObject.GL_STENCIL_ATTACHMENT_EXT, OpenGlHelper.GL_RENDERBUFFER, this.depthBuffer);
+                }
             }
 
             this.framebufferClear();
@@ -279,4 +288,36 @@
         GlStateManager.clear(i);
         this.unbindFramebuffer();
     }
+
+    /*================================ FORGE START ================================================*/
+    private boolean stencilEnabled = false;
+    /**
+     * Attempts to enabled 8 bits of stencil buffer on this FrameBuffer.
+     * Modders must call this directly to set things up.
+     * This is to prevent the default cause where graphics cards do not support stencil bits.
+     * Modders should check the below 'isStencilEnabled' to check if another modder has already enabled them.
+     *
+     * Note:
+     *   As of now the only thing that is checked is if FBOs are supported entirely, in the future
+     *   we may expand to check for errors.
+     *
+     * @return True if the FBO was re-initialized with stencil bits.
+     */
+    public boolean enableStencil()
+    {
+        if (!OpenGlHelper.isFramebufferEnabled()) return false;
+        stencilEnabled = true;
+        this.createBindFramebuffer(framebufferWidth, framebufferHeight);
+        return true; //TODO: Find a way to detect if this failed?
+    }
+
+    /**
+     * Returns wither or not this FBO has been successfully initialized with stencil bits.
+     * If not, and a modder wishes it to be, they must call enableStencil.
+     */
+    public boolean isStencilEnabled()
+    {
+        return this.stencilEnabled;
+    }
+    /*================================ FORGE END   ================================================*/
 }