README.md

HlslDecompiler

Decompiles Shader Model 3.0 shaders into HLSL code

Usage

HlslDecompiler [--ast] shader.fxc

The program will output the assembly listing in shader.asm, e.g.

ps_3_0
def c0, 1, 0, 2, 0
dcl_texcoord v0.xz
mov oC0.x, -v0.z_abs
mad oC0.yzw, v0.xxx, c0.xyy, c0.yxz

and the decompiled HLSL code in shader.fx:

float4 main(float3 texcoord : TEXCOORD) : COLOR
{
	float4 o;

	o.x = -abs(texcoord.z);
	o.yzw = texcoord.xxx * float3(1, 0, 0) + float3(0, 1, 2);

	return o;
}

With the --ast option, the program will attempt generate more readable HLSL. It does this by taking the shader bytecode, constructing an abstract syntax tree, simplyfying it and compiling to HLSL:

float4 main(float3 texcoord : TEXCOORD) : COLOR
{
	return float4(-abs(texcoord.z), texcoord.x, 1, 2);
}