Members - Reputation: 145
Posted 23 September 2012 - 02:59 PM
Unhandled exception at 0x777b15de in d3dDrawTriangle.exe: 0xC0000005: Access violation reading location 0x00000000.
I've narrowed the problem down to these lines:
// load and compile the two shaders
ID3D10Blob *VS, *PS;
ID3D10Blob *VErrorMessage, *PErrorMessage;
D3DX11CompileFromFile(L"shaders.hlsl", 0, 0, "VShader", "vs_5_0", 0, 0, 0, &VS, &VErrorMessage, 0); // for some reason this is returning a NULL pointer for &VS
D3DX11CompileFromFile(L"shaders.hlsl", 0, 0, "PShader", "ps_5_0", 0, 0, 0, &PS, &PErrorMessage, 0); // for some reason this is returning s NULL pointer for &PS
// encapsulate both shaders into shader objects
dev->CreateVertexShader(VS->GetBufferPointer(), VS->GetBufferSize(), NULL, &pVS);
dev->CreatePixelShader(PS->GetBufferPointer(), PS->GetBufferSize(), NULL, &pPS);
After some research I figured out that for some reason, D3DX11CompileFromFile is returning a NULL pointer, so when it tries to use VS, and I'm assuming PS, it is NULL, and thus doesn't work. I've tried updating my graphics card driver, but that hasn't helped, and I have no idea how to fix this problem. Any help would be amazing.
Also, here's the shader file I am using:
float4 position : SV_POSITION;
float4 color : COLOR;
VOut VShader(float4 position : POSITION, float4 color : COLOR)
output.position = position;
output.color = color;
float4 PShader(float4 position : SV_POSITION, float4 color : COLOR) : SV_TARGET
Crossbones+ - Reputation: 12273
Posted 23 September 2012 - 03:32 PM
char *verror = (char *) VErrorMessage->GetBufferPointer (); char *perror = (char *) PErrorMessage->GetBufferPointer ();
Edited by mhagain, 23 September 2012 - 03:33 PM.
It appears that the gentleman thought C++ was extremely difficult and he was overjoyed that the machine was absorbing it; he understood that good C++ is difficult but the best C++ is well-nigh unintelligible.
Members - Reputation: 145
Posted 23 September 2012 - 07:55 PM
Alright, I did that, and the char on both Error Messages results to this:
If you take your VErrorMessage and PErrorMessage blobs, call GetBufferPointer on them and cast the result to "char *" it will tell you what went wrong. Most probable is that it can't find the files you specify.
= CXX0030: Error: expression cannot be evaluated
I don't really get what that means, and I have moved the shaders.hlsl file into the project file, but that hasn't helped. I'm still stuck...
Crossbones+ - Reputation: 4031
Posted 24 September 2012 - 12:01 AM
A robust way is to get the path of the executable using GetModuleFileName (, strip the exe file name from that), and concatenate it with the shader file name.
The error blobs do not catch "file not found", because the errors are written by the compiler after it actually gets to work on a found file data.
Crossbones+ - Reputation: 4492
Posted 24 September 2012 - 07:50 AM
If it's unclear whether the FromFile() methods even know where to find the files in the first place, you should use a custom loader for the hlsl data. First make sure the data is available, then pass it to D3DX11CompileFromMemory.
Edited by eppo, 24 September 2012 - 07:52 AM.