utility-functions-glsl

[vinjn]

#define REPORT_COMPILE_ERRORS

//////////////////////////////////////////////////////////////////////////////////////////////
inline GLuint CompileGLSLShader( GLenum target, const char* shader)
{
    GLuint object;

    object = glCreateShader( target);

    if (!object)
        return object;

    glShaderSource( object, 1, &shader, NULL);

    glCompileShader(object);

    // check if shader compiled
    GLint compiled = 0;
    glGetShaderiv(object, GL_COMPILE_STATUS, &compiled);

    if (!compiled)
    {
#ifdef REPORT_COMPILE_ERRORS
        char temp[256] = "";
        glGetShaderInfoLog( object, 256, NULL, temp);
        fprintf( stderr, "Compile failed:\n%s\n", temp);
#endif
        glDeleteShader( object);
        return 0;
    }

    return object;
}

// Create a program composed of vertex and fragment shaders.
inline GLuint LinkGLSLProgram( GLuint vertexShader, GLuint fragmentShader)
{
    GLuint program = glCreateProgram();
    glAttachShader(program, vertexShader);
    glAttachShader(program, fragmentShader);
    glLinkProgram(program);

#ifdef REPORT_COMPILE_ERRORS
    // Get error log.
    GLint charsWritten, infoLogLength;
    glGetProgramiv(program, GL_INFO_LOG_LENGTH, &infoLogLength);

    char * infoLog = new char[infoLogLength];
    glGetProgramInfoLog(program, infoLogLength, &charsWritten, infoLog);
    printf(infoLog);
    delete [] infoLog;
#endif

    // Test linker result.
    GLint linkSucceed = GL_FALSE;
    glGetProgramiv(program, GL_LINK_STATUS, &linkSucceed);

    if (linkSucceed == GL_FALSE)
    {
        glDeleteProgram(program);
        return 0;
    }

    return program;
}