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Heres the full console text:

[23:55:56] [main/INFO]: Loading tweak class name shadersmod.launch.SMCTweaker
[23:55:57] [main/INFO]: Using primary tweak class name shadersmod.launch.SMCTweaker
[23:55:57] [main/INFO]: Calling tweak class shadersmod.launch.SMCTweaker
[SMC INF]ShadersMod 2.4.12
[23:55:57] [main/INFO]: Launching wrapped minecraft {net.minecraft.client.main.Main}
[SMC FNE]transforming bsu bsu
[SMC FNE]transforming cui cui
[23:55:57] [Client thread/INFO]: Setting user: cookie
[23:55:57] [Client thread/INFO]: (Session ID is token: :2dccd1ab3e03390aaa77359831c85ca2)
[SMC FNE]transforming atr atr
[SMC INF] blockAoLight
[SMC FNE]transforming aju aju
[23:55:59] [Client thread/INFO]: LWJGL Version: 2.9.1
[SMC FNE]transforming dax dax
[SMC FNT] set activeTexUnit
[SMC FNE]transforming ctp ctp
[SMC FNE]transforming cto cto
[SMC FNE]transforming cua cua
[SMC FNT] loadRes
[SMC FNT] loadRes
[SMC FNT] allocateTextureMap
[SMC FNT] setSprite setIconName
[SMC FNT] uploadTexSubForLoadAtlas
[23:56:00] [Client thread/INFO]: Reloading ResourceManager: Default, 3D Sword Pack 3.zip, [1.8.3]_R3D.CRAFT_SR-64x_v0.2.2.zip
[SMC FNE]transforming cug cug
[SMC FNE]transforming ciy ciy
[SMC FNE]transforming civ civ
[SMC FNE]transforming cus cus
[23:56:02] [Sound Library Loader/INFO]: Starting up SoundSystem...
[23:56:02] [Thread-7/INFO]: Initializing LWJGL OpenAL
[23:56:02] [Thread-7/INFO]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
[SMC FNE]transforming ctv ctv
[SMC FNR] loadSimpleTexture
[23:56:02] [Thread-7/INFO]: OpenAL initialized.
[23:56:03] [Sound Library Loader/INFO]: Sound engine started
---- Minecraft Crash Report ----
// My bad.

Time: 05/07/15 11:56 PM
Description: Registering texture

java.lang.OutOfMemoryError: Java heap space
at shadersmod.client.ShadersTex.getIntArray(ShadersTex.java:78)
at shadersmod.client.ShadersTex.loadSimpleTexture(ShadersTex.java:894)
at ctv.a(SourceFile:47)
at cug.a(SourceFile:56)
at cug.a(SourceFile:38)
at bty.<init>(SourceFile:59)
at bsu.aj(SourceFile:387)
at bsu.a(SourceFile:299)
at net.minecraft.client.main.Main.main(SourceFile:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Stacktrace:
at shadersmod.client.ShadersTex.getIntArray(ShadersTex.java:78)
at shadersmod.client.ShadersTex.loadSimpleTexture(ShadersTex.java:894)
at ctv.a(SourceFile:47)

-- Resource location being registered --
Details:
Resource location: minecraft:textures/font/ascii.png
Texture object class: ctv
Stacktrace:
at cug.a(SourceFile:56)
at cug.a(SourceFile:38)
at bty.<init>(SourceFile:59)
at bsu.aj(SourceFile:387)

-- Initialization --
Details:
Stacktrace:
at bsu.a(SourceFile:299)
at net.minecraft.client.main.Main.main(SourceFile:120)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.8.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 382126744 bytes (364 MB) / 523501568 bytes (499 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: 1.8-ShadersMod2.4.12
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2622, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Resource Packs: [3D Sword Pack 3.zip, [1.8.3]_R3D.CRAFT_SR-64x_v0.2.2.zip]
Current Language: Español (Argentina)
Profiler Position: N/A (disabled)
#@[email protected]# Game crashed! Crash report saved to: #@[email protected]# C:\Users\user\AppData\Roaming\.minecraft\crash-reports\crash-2015-07-05_23.56.04-client.txt
[23:56:04] [Client Shutdown Thread/INFO]: Stopping server
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) Client VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

Please help

what are your PC specs?