bool Cc3dProgram::initWithFile(const string&vertShaderFilePath,const string&fragShaderFilePath){
m_vertShaderFilePath=vertShaderFilePath;
m_fragShaderFilePath=fragShaderFilePath;
//create shader
vector<string> _vertShaderFileName=splitStrInTwoByLastDot(vertShaderFilePath);
vector<string> _fragShaderFileName=splitStrInTwoByLastDot(fragShaderFilePath);
//创建Program
GLuint vertShader=createShader(_vertShaderFileName[0].c_str(), _vertShaderFileName[1].c_str());
GLuint fragShader=createShader(_fragShaderFileName[0].c_str(), _fragShaderFileName[1].c_str());
//Calls glCreateProgram, glAttachShader, and glLinkProgram to link the vertex and fragment shaders into a complete program.
GLuint programHandle = glCreateProgram();
glAttachShader(programHandle, vertShader);
glAttachShader(programHandle, fragShader);
//needs to be done prior to linking
{
glBindAttribLocation(programHandle, ATTRIB_LOC_position_local, "position_local");
glBindAttribLocation(programHandle, ATTRIB_LOC_texCoord, "texCoordIn");
glBindAttribLocation(programHandle, ATTRIB_LOC_normal_local, "normal_local");
}
glLinkProgram(programHandle);//link过以后，通过glGet**Location得到的索引就是固定的了
//check and see if there were any link errors
GLint linkSuccess;
glGetProgramiv(programHandle, GL_LINK_STATUS, &linkSuccess);
if (linkSuccess == GL_FALSE) {
GLchar messages[1024];
glGetProgramInfoLog(programHandle, sizeof(messages), 0, &messages[0]);
C3DASSERT(false,messages);
}
m_program=programHandle;
return true;
}
GLuint createShader_plat(const char*shaderName,const char*ext)
{
//judage shader type: vertex shader or fragment shader
GLuint shaderHandle=0;
string postFix=ext;//后缀--abc
if(postFix == "vert"){//是顶点shader
shaderHandle = glCreateShader(GL_VERTEX_SHADER);
}else if(postFix == "frag"){
shaderHandle = glCreateShader(GL_FRAGMENT_SHADER);
}else{
C3DASSERT(false);
}
string fileName=string(shaderName)+"."+ext;
string filePath=Cc3dFileUtils::sharedFileUtils()->getFullPath(fileName.c_str());
const char*content = textFileRead((char*)filePath.c_str());//文件内容--abc
glShaderSource(shaderHandle, 1, &content,NULL);
free((char*)content);
glCompileShader(shaderHandle);
return shaderHandle;
}
void getMemStatistics_plat(int&memUsed,int&memFree,int&memTotal){//获得内存统计数据--abc
//no implemented yet
C3DASSERT(false);
}
