java.lang.OutOfMemoryError: Java heap space

Minecraft Crash Report ----
// Who set us up the TNT?

Time: 5/28/14 4:21 PM
Description: Registering texture

java.lang.OutOfMemoryError: Java heap space
at bsn.a(SourceFile:196)
at bsj.b(SourceFile:142)
at bsj.a(SourceFile:90)
at bsp.a(SourceFile:72)
at bsp.a(SourceFile:61)
at bsp.a(SourceFile:52)
at ban.ag(SourceFile:438)
at ban.f(SourceFile:712)
at net.minecraft.client.main.Main.main(SourceFile:148)

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

– Head –
Stacktrace:
at bsn.a(SourceFile:196)
at bsj.b(SourceFile:142)
at bsj.a(SourceFile:90)

– Resource location being registered –
Details:
Resource location: minecraft:textures/atlas/blocks.png
Texture object class: bsj
Stacktrace:
at bsp.a(SourceFile:72)
at bsp.a(SourceFile:61)
at bsp.a(SourceFile:52)
at ban.ag(SourceFile:438)

– Initialization –
Details:
Stacktrace:
at ban.f(SourceFile:712)
at net.minecraft.client.main.Main.main(SourceFile:148)

– System Details –
Details:
Minecraft Version: 1.7.7
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_51, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 35136384 bytes (33 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.7.7
LWJGL: 2.9.1
OpenGL: AMD Radeon HD 7640G GL version 4.2.11774 Compatibility Profile Context, ATI Technologies Inc.
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [Inter_Realistic_Resource_Pack_512_V1.6.4.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)