Shader::Shader(const char* vsFilePath, const char* fsFilePath)
:m_vShaderFile(NULL), m_fShaderFile(NULL), m_vFileSize(0), m_fFileSize(0)
{
// 加载 vs
if (_loadShader(vsFilePath, &m_vShaderFile, &m_vFileSize) != 0) return;
const char* tmp = m_vShaderFile;
// 编译
GLuint vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &tmp, NULL);
glCompileShader(vertexShader);
GLint success ;
GLchar infoLog[1024];
glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
if (!success)
{
//输出错误信息；
glGetShaderInfoLog(vertexShader, 1024, NULL, infoLog);
return;
}
//加载
if (_loadShader(fsFilePath, &m_fShaderFile, &m_fFileSize) != 0) return;
tmp = m_fShaderFile;
//fs obj
GLuint fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &tmp, NULL);
glCompileShader(fragmentShader);
// 检查 fs 编译结果：
glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
if (!success)
{
//输出错误信息；
glGetShaderInfoLog(fragmentShader, 1024, NULL, infoLog);
return;
}
//生成 program objec 并且进行链接
m_shaderProgram = glCreateProgram();
glAttachShader(m_shaderProgram, vertexShader);
glAttachShader(m_shaderProgram, fragmentShader);
glLinkProgram(m_shaderProgram);
glGetProgramiv(m_shaderProgram, GL_LINK_STATUS, &success);
if (!success)
{
//输出错误信息；
glGetProgramInfoLog(m_shaderProgram, 1024, NULL, infoLog);
return;
}
//删除 vs,fs
glDeleteShader(vertexShader);
glDeleteShader(fragmentShader);
}
bool GLSLShaders::loadShaders(const std::string &vShader,
const std::string &fShader,
const GLEWContext *glewContext)
{
if (_shadersLoaded)
return true;
LBASSERT(glewContext);
_glewContext = glewContext;
_program = glCreateProgramObjectARB();
GLhandleARB vertexShader = _loadShader(vShader, GL_VERTEX_SHADER_ARB);
if (!vertexShader)
return _cleanupOnError();
glAttachObjectARB(_program, vertexShader);
GLhandleARB fragmentShader = _loadShader(fShader, GL_FRAGMENT_SHADER_ARB);
if (!fragmentShader)
return _cleanupOnError(vertexShader);
glAttachObjectARB(_program, fragmentShader);
glLinkProgramARB(_program);
GLint status;
glGetObjectParameterivARB(_program, GL_OBJECT_LINK_STATUS_ARB, &status);
if (status != GL_FALSE)
{
_shadersLoaded = true;
return true;
}
_printLog(_program, "Linking");
return _cleanupOnError(vertexShader, fragmentShader);
}
bool CShaderMngr::LoadShader(const char *strFileName, GLenum nShaderType, const char *strName)
{
shaderData *sData = new shaderData;
if (_loadShader(strFileName, sData) == 0)
{
if (_compileShader(sData, nShaderType))
{
m_Shaders.push_back(std::pair<string, shaderData*>(string(strName), sData));
return true;
}
}
return false;
}
