游戏编程理论课程期末考察作业（glsl源代码）

#include <stdio.h> #include <iostream> #include "Shader.h" int CheckGLError(char *file, int line) { GLenum glErr; int retCode = 0; glErr = glGetError(); while (glErr != GL_NO_ERROR) { cout << "GL Error #" << glErr << "(" << gluErrorString(glErr) << ") " << " in File " << file << " at line: " << line << endl; retCode = 1; glErr = glGetError(); } return retCode; } CShaderObject::CShaderObject(GLenum vShaderType) { _ShaderType = vShaderType; _ShaderID = glCreateShader(_ShaderType); if (_ShaderID == 0) { cout << "Fail to create shader object!\n"; exit(-1); } } CShaderObject::~CShaderObject(void) { glDeleteShader(_ShaderID); } unsigned long CShaderObject::getFileLength(ifstream& vFile) { if(!vFile.good()) return 0; unsigned long pos=vFile.tellg(); vFile.seekg(0,ios::end); unsigned long len = vFile.tellg(); vFile.seekg(ios::beg); return len; } GLuint CShaderObject::loadShaderFromFile(char* vFileName) { ifstream file; file.open(vFileName, ios::in); if(!file) return 0; GLint len = getFileLength(file); _pShaderSource = new char[len+1]; int i=0; while (file.good()) { _pShaderSource[i++] = file.get(); // get character from file if (i>len) i=len; } _pShaderSource[i] = 0; // 0 terminate it. int k = 1; while (_pShaderSource[i-k] != '}') { _pShaderSource[i-k] = 0; k++; } file.close(); int ShaderStatus; glShaderSource(_ShaderID, 1, (const GLchar **)&_pShaderSource, &len); CheckGLError(__FILE__, __LINE__); glCompileShader(_ShaderID); CheckGLError(__FILE__, __LINE__); glGetShaderiv(_ShaderID, GL_COMPILE_STATUS, &ShaderStatus); if (ShaderStatus == GL_FALSE) { cout << "Fail to compile the shader:" << vFileName << "\n"; GLchar compileErr[1024]; glGetShaderInfoLog(_ShaderID, 1024, NULL, compileErr); cout << "Compile errors: \n" << compileErr << "\n"; exit(-1); } return _ShaderID; } CProgramObject::CProgramObject(void) { _ProgramID = glCreateProgram(); if (_ProgramID == 0) { cout << "Fail to create shader program object!\n"; exit(-1); } } CProgramObject::~CProgramObject(void) { for (unsigned int i=0; i<_ShaderObjectList.size(); i++) { delete _ShaderObjectList[i].pObject; } glDeleteProgram(_ProgramID); } GLuint CProgramObject::loadShaderFromFile(char *vFileName, GLenum vShaderType) { CShaderObject *pObject=new CShaderObject(vShaderType); GLuint ShaderID; ShaderObject t; ShaderID = pObject->loadShaderFromFile(vFileName); if (ShaderID == 0) { cout << "Fail to load the shader source file!\n"; exit(-1); } t.pObject = pObject; t.ID = ShaderID; _ShaderObjectList.push_back(t); return ShaderID; } void CProgramObject::makePipeline(GLuint vVertexShaderID, GLuint vFragShaderID) { int ProgramStatus; GLuint attachedShaders[10]; int numAttachedShaders; glGetAttachedShaders(_ProgramID, 10, &numAttachedShaders, attachedShaders); for (int i=0; i<numAttachedShaders; i++) { glDetachShader(_ProgramID, attachedShaders[i]); CheckGLError(__FILE__, __LINE__); } glAttachShader(_ProgramID, vVertexShaderID); CheckGLError(__FILE__, __LINE__); glAttachShader(_ProgramID, vFragShaderID); CheckGLError(__FILE__, __LINE__); glLinkProgram(_ProgramID); glGetProgramiv(_ProgramID, GL_LINK_STATUS, &ProgramStatus); if (ProgramStatus == GL_FALSE) { cout << "Fail to link the program!\n"; exit(-1); } glUseProgram(_ProgramID); CheckGLError(__FILE__, __LINE__); } void CProgramObject::sendUniform3f(char* vVarName, GLfloat v0, GLfloat v1, GLfloat v2) { GLint loc; loc = glGetUniformLocation(_ProgramID, vVarName); if (loc == -1) { cout << "Error: can't find uniform variable \"" << vVarName << "\"\n"; } glUniform3f(loc, v0, v1, v2); } void CProgramObject::sendUniform1f(char* vVarName, GLfloat v) { GLint loc; loc = glGetUniformLocation(_ProgramID, vVarName); if (loc == -1) { cout << "Error: can't find uniform variable \"" << vVarName << "\"\n"; } glUniform1f(loc, v); } void CProgramObject::sendUniform1i(char* vVarName, GLint v) { GLint loc; loc = glGetUniformLocation(_ProgramID, vVarName); if (loc == -1) { cout << "Error: can't find uniform variable \"" << vVarName << "\"\n"; } glUniform1i(loc, v); }