From cad366d3319aad9f448db1d16445dea7e9dcb599 Mon Sep 17 00:00:00 2001
From: Jeanne-Kamikaze <jeannekamikaze@gmail.com>
Date: Tue, 12 Mar 2013 15:58:10 +0100
Subject: Added unbind functions

---
 Spear/GL.hs | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/Spear/GL.hs b/Spear/GL.hs
index 65f985b..aa3e930 100644
--- a/Spear/GL.hs
+++ b/Spear/GL.hs
@@ -5,6 +5,7 @@ module Spear.GL
 ,   newProgram
 ,   linkProgram
 ,   useProgram
+,   unuseProgram
 ,   withGLSLProgram
     -- ** Locations
 ,   attribLocation
@@ -36,6 +37,7 @@ module Spear.GL
 ,   VAO
 ,   newVAO
 ,   bindVAO
+,   unbindVAO
 ,   enableVAOAttrib
 ,   attribVAOPointer
     -- ** Rendering
@@ -47,6 +49,7 @@ module Spear.GL
 ,   BufferUsage(..)
 ,   newBuffer
 ,   bindBuffer
+,   unbindBuffer
 ,   BufferData(..)
 ,   bufferData'
 ,   withGLBuffer
@@ -59,6 +62,7 @@ module Spear.GL
 ,   loadTextureImage
     -- ** Manipulation
 ,   bindTexture
+,   unbindTexture
 ,   loadTextureData
 ,   texParami
 ,   texParamf
@@ -162,10 +166,8 @@ newProgram shaders = do
     when (h == 0) $ gameError "glCreateProgram failed"
     rkey <- register $ deleteProgram h
     let program = GLSLProgram h rkey
-
     mapM_ (gameIO . attachShader program) shaders
     linkProgram program
-
     return program
 
 -- | Delete the program.
@@ -196,6 +198,10 @@ linkProgram prog = do
 useProgram :: GLSLProgram -> IO ()
 useProgram prog = glUseProgram $ getProgram prog
 
+-- | Deactivate the active program.
+unuseProgram :: IO ()
+unuseProgram = glUseProgram 0
+
 -- | Attach the given shader to the given program.
 attachShader :: GLSLProgram -> GLSLShader -> IO ()
 attachShader prog shader = glAttachShader (getProgram prog) (getShader shader)
@@ -411,6 +417,10 @@ deleteVAO vao = Foreign.with vao $ glDeleteVertexArrays 1
 bindVAO :: VAO -> IO ()
 bindVAO = glBindVertexArray . getVAO
 
+-- | Unbind the bound vao.
+unbindVAO :: IO ()
+unbindVAO = glBindVertexArray 0
+
 -- | Enable the given vertex attribute of the bound vao.
 --
 -- See also 'bindVAO'.
@@ -516,6 +526,10 @@ deleteBuffer buf = Foreign.with buf $ glDeleteBuffers 1
 bindBuffer :: GLBuffer -> TargetBuffer -> IO ()
 bindBuffer buf target = glBindBuffer (fromTarget target) $ getBuffer buf
 
+-- | Unbind the bound buffer.
+unbindBuffer :: TargetBuffer -> IO ()
+unbindBuffer target = glBindBuffer (fromTarget target) 0
+
 class Storable a => BufferData a where
       -- | Set the buffer's data.
       bufferData :: TargetBuffer -> [a] -> BufferUsage -> IO ()
@@ -616,6 +630,10 @@ loadTextureImage file minFilter magFilter = do
 bindTexture :: Texture -> IO ()
 bindTexture = glBindTexture gl_TEXTURE_2D . getTex
 
+-- | Unbind the bound texture.
+unbindTexture :: IO ()
+unbindTexture = glBindTexture gl_TEXTURE_2D 0
+
 -- | Load data onto the bound texture.
 --
 -- See also 'bindTexture'.
-- 
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