GLSL shaders (dev) texture function

---- Minecraft Crash Report ----
// Why is it breaking :(

Time: 6/07/13 7:44 AM
Description: Failed to start game

java.lang.ClassCastException: net.minecraft.client.renderer.texture.Texture cannot be cast to TextureNM
    at TextureNM.func_94281_a(TextureNM.java:46)
    at net.minecraft.client.renderer.texture.Stitcher.func_94306_e(Stitcher.java:69)
    at net.minecraft.client.renderer.texture.TextureMap.func_94247_b(TextureMap.java:158)
    at net.minecraft.client.renderer.RenderEngine.func_94152_c(RenderEngine.java:698)
    at net.minecraft.client.renderer.RenderEngine.func_78352_b(RenderEngine.java:572)
    at cpw.mods.fml.client.FMLClientHandler.onInitializationComplete(FMLClientHandler.java:258)
    at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:479)
    at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
    at net.minecraft.client.Minecraft.run(Minecraft.java:733)
    at java.lang.Thread.run(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
    Minecraft Version: 1.5.2
    Operating System: Windows 8 (amd64) version 6.2
    Java Version: 1.7.0_21, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 1009988816 bytes (963 MB) / 1483866112 bytes (1415 MB) up to 3817799680 bytes (3640 MB)
    JVM Flags: 3 total; -Xmx4096M -Xms512M -XX:MaxPermSize=512M
    AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
    Suspicious classes: FML and Forge are installed
    IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
    FML: MCP v7.51 FML v5.2.23.737 Minecraft Forge 7.8.1.737 Optifine OptiFine_1.5.2_HD_U_D3 12 mods loaded, 12 mods active
    mcp{7.51} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    FML{5.2.23.737} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    Forge{7.8.1.737} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    CodeChickenCore{0.8.7} [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    CoFHFramework{1.5.2.5} [CoFH Framework] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    InfiniBows{1.0.0 build 10} [Infinity Bow Fix] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    NotEnoughItems{1.5.2.28} [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    PowerCrystalsCore{1.1.6} [PowerCrystals Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    CoFHCore{1.5.2.5} [CoFHCore] (CoFHCore-1.5.2.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    CoFHWorld{1.5.2.5} [CoFHWorld] (CoFHCore-1.5.2.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    denLib{3.0.14} [denLib] (denLib-1.5.2-3.0.14.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    Railcraft{7.2.3.0} [Railcraft] (Railcraft_1.5.2-7.2.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
    LWJGL: 2.4.2
    OpenGL: GeForce GT 540M/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
    Is Modded: Definitely; Client brand changed to 'fml,forge'
    Type: Client (map_client.txt)
    Texture Pack: Default
    Profiler Position: N/A (disabled)
    Vec3 Pool Size: ~~ERROR~~ NullPointerException: null