Crash when compiling/linking/using GLSL shaders in win32?

Graphics and GPU Programming Programming

Started by DominicHughes April 14, 2012 11:12 AM

5 comments, last by thetooth 12 years ago

DominicHughes

143

Author

April 14, 2012 11:12 AM

Hello I was just trying to use GLSL shaders in win32 but having issues with my function:



//LOAD SHADER FUNCTION

GLuint LoadProgram(const char * vertex_file_path, const char * Fragment_file_path)

{

  GLuint VertexShaderID = glCreateShader(GL_VERTEX_SHADER);

  cout << "Vertex Shader Creation" << endl;

  GLuint FragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);

  cout << "Fragment Shader Creation" << endl;

  //READ THE VERTEX SHADER CODE

  string VertexShaderCode;

  ifstream VertexShaderStream(vertex_file_path, std::ios::in);

  cout << "Reading Vertex Shader" << endl;

  if(VertexShaderStream.is_open())

  {

	string Line = "";

	while(getline(VertexShaderStream, Line))

	  VertexShaderCode += "\n" + Line;

	VertexShaderStream.close();

  }

  //READ THE FRAGMENT SHADER CODE

  string FragmentShaderCode;

  ifstream FragmentShaderStream(Fragment_file_path, std::ios::in);

  if(FragmentShaderStream.is_open())

  {

	string Line = "";

	while(getline(FragmentShaderStream, Line))

	  FragmentShaderCode += "\n" + Line;

	FragmentShaderStream.close();

  }

  GLint Result = GL_FALSE;

  int InfoLogLength;

  //Compile Vertex Shader

  printf("Compiling Shader : %s\n", vertex_file_path);

  char const * VertexSourcePointer = VertexShaderCode.c_str();

  glShaderSource(VertexShaderID,  1,  &VertexSourcePointer,  NULL);

  glCompileShader(VertexShaderID);

  //Check Vertex Shader

  glGetShaderiv(VertexShaderID, GL_COMPILE_STATUS,  &Result);

  glGetShaderiv(VertexShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);

  vector<char> VertexShaderErrorMessage(InfoLogLength);

  glGetShaderInfoLog(VertexShaderID, InfoLogLength, NULL, &VertexShaderErrorMessage[0]);

  fprintf(stdout, "%s\n",  &VertexShaderErrorMessage[0]);

  //Compile Fragment Shader

  printf("Compiling Shader : %s\n",  Fragment_file_path);

  char const * FragmentSourcePointer = FragmentShaderCode.c_str();

  glShaderSource(FragmentShaderID, 1, &FragmentSourcePointer, NULL);

  glCompileShader(FragmentShaderID);

  //Check Fragment Shader

  glGetShaderiv(FragmentShaderID, GL_COMPILE_STATUS, &Result);

  glGetShaderiv(FragmentShaderID, GL_INFO_LOG_LENGTH, &InfoLogLength);

  vector<char> FragmentShaderErrorMessage(InfoLogLength);

  glGetShaderInfoLog(FragmentShaderID, InfoLogLength, NULL, &FragmentShaderErrorMessage[0]);

  fprintf(stdout,  "%s\n",  &FragmentShaderErrorMessage[0]);

  fprintf(stdout,  "Linking Program\n");

  GLuint ProgramID = glCreateProgram();

  //Bind Attribute

  glBindAttribLocation(ProgramID, 0, "position");

  glBindAttribLocation(ProgramID, 1, "Texcoord0");

  //Link The Program

  glAttachShader(ProgramID, VertexShaderID);

  glAttachShader(ProgramID, FragmentShaderID);

  glLinkProgram(ProgramID);

  texture1 = glGetUniformLocation(ProgramID, "myTextureSampler");

  matrixuniform =  glGetUniformLocation(ProgramID, "myMatrix");



  //Check The Program

  glGetProgramiv(ProgramID,  GL_LINK_STATUS, &Result);

  glGetProgramiv(ProgramID, GL_INFO_LOG_LENGTH, &InfoLogLength);

  vector<char> ProgramErrorMessage( max(InfoLogLength, int(1)) );

  fprintf(stdout,  "%s\n", &ProgramErrorMessage[0]);

  //Delete Shader

  glDeleteShader(VertexShaderID);

  glDeleteShader(FragmentShaderID);

  glUseProgram(ProgramID);

  //Return ProgramID

  return ProgramID;

}

this function ^^
EDIT: It crashes after that function ^^

not being executed after I call hRC = wglCreateContext(hDC);

or any other time

I have no idea why? could someone tell me what the common errors are for this function not working in win32? it works in SDL/C++? so why shouldn't it work with this ???.

Thanks in advance

L. Spiro

25,818

April 14, 2012 11:25 AM

I don’t understand. Your topic mentions a crash but your post does not. Your post says that function is not executed (called?) after wglCreateContext() or any other time.
Exactly what is the error?

L. Spiro

I restore Nintendo 64 video-game OST’s into HD! https://www.youtube.com/channel/UCCtX_wedtZ5BoyQBXEhnVZw/playlists?view=1&sort=lad&flow=grid

DominicHughes

143

Author

April 14, 2012 11:26 AM

it crashes thats why it won't execute should have made that clearer damit lol

thetooth

103

April 14, 2012 03:50 PM

I tested your code and found nothing _wrong_ with what it does, you could lay off the STL a bit but i was able to load a shader and run it, so your crash is being caused by something else.

Also it would help if you posted some more information, im sure your debugger will give you a stack trace, so just follow that and see what the environment looks like at that point in time.

One more thing to note is its not a good idea to delete your shaders after linking, just in case you decide(or more importantly, the driver decides) the shader needs to be recompiled you will have linker problems.

RobinsonUK

108

April 14, 2012 05:19 PM

arghhh. Sorry, edit fail... deleted :-).

DominicHughes

143

Author

April 14, 2012 06:11 PM

I fixed my problem I forgot to use wglMakeCurrent(hDC, hRC); after wglCreateContext(hDC) Stupid error. but now my problem is trying to do texture mapping I need to get a HBITMAP to a glTexImage2D function in OpenGL has any one had any luck with this?.

thetooth

103

April 14, 2012 06:27 PM

http://msdn.microsoft.com/en-us/library/dd183371(v=vs.85).aspx

all of the data needed to handle the image provided for you in that type, just initialise the texture with the contents of bmBits, afaik this is just raw pixel data which is what opengl takes using glTexImage2D, where this gets tricky is if you're trying to use some built in resources or perhaps a strange format, in which case you'll have to pay attention to the encoding of the pixel data other wise you'll end up with garbage or no output.

Crash when compiling/linking/using GLSL shaders in win32?

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