| 0x00 | 4 character ASCII string | Magic, should read "ShPk". |
| 0x04 | Unknown 4 byte. | Unknown. |
| 0x08 | 4 character ASCII string | The format of the shader, e.g. "DX11". |
| 0x0C | 32-bit integer | File length in bytes. |
| 0x10 | 32-bit integer | Offset in bytes to the shader bytecode. |
| 0x14 | 32-bit integer | Offset in bytes to the parameter list. |
| 0x18 | 32-bit integer | Number of vertex shaders. |
| 0x1C | 32-bit integer | Number of pixel shaders. |
| 0x20 | 32-bit integer | Number of scalar parameters. |
| 0x24 | 32-bit integer | Number of resource parameters. |
# Reading shader bytecode
Getting the shader bytecode from a shader package is easy, it begins at the shader bytecode offset in the header. Then, move your cursor up 12 bytes (to skip the initial `DXBC` ASCII, and some garbage data).
Then, collect a WORD (4 bytes) at a time and putting them into a buffer. Keep doing this until you hit the next `DXBC` ASCII and you found a complete shader bytecode. Rinse and repeat and you should have `N` shaders where `N = number of vertex shaders + number of pixel shaders`.
The format of this shader bytecode is nothing special, it's DXBC (the bytecode format used by DirectX before DXIL.) If you want to reverse this into something usable, like SPIR-V, HLSL or GLSL then you need to find a decompiler.
