OpenGL学习主要代码类

#include "stdafx.h" #include "GLRender.h" //创建临时窗口用 static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { return DefWindowProc(hWnd, message, wParam, lParam); } CGLRenderer::CGLRenderer(void) { } CGLRenderer:: ~CGLRenderer(void) { } bool CGLRenderer::GetPixelFormat(CREATESTRUCT& cs) { // 1. 创建临时窗口 CString m_ClassName("TempView"); WNDCLASS wnd; wnd.cbClsExtra = 0; wnd.cbWndExtra = 0; wnd.hCursor = LoadCursor(0, IDC_ARROW); wnd.hIcon = LoadIcon(0, IDI_WINLOGO); wnd.lpszMenuName = 0; wnd.style = 0; wnd.hbrBackground = 0; wnd.lpfnWndProc = WndProc; wnd.hInstance = cs.hInstance; wnd.lpszClassName = m_ClassName; //Register window class RegisterClass(&wnd); HWND hwnd = CreateWindowEx(NULL, m_ClassName, m_ClassName, WS_OVERLAPPEDWINDOW, 0, 0, 20, 20, NULL, NULL, cs.hInstance, NULL); ::ShowWindow(hwnd, SW_HIDE); // Don't show the window. HDC tempHdc = GetDC(hwnd); // 2.获得临时窗口的pixelformat pfd = { sizeof(PIXELFORMATDESCRIPTOR), 1, PFD_DRAW_TO_WINDOW | // support window PFD_SUPPORT_OPENGL | // support OpenGL PFD_DOUBLEBUFFER, // double buffered PFD_TYPE_RGBA, // RGBA type 32, // 32-bit color depth 0, 0, 0, 0, 0, 0, // color bits ignored 0, // no alpha buffer 0, // shift bit ignored 0, // no accumulation buffer 0, 0, 0, 0, // accum bits ignored 24, // 24-bit z-buffer 0, // no stencil buffer 0, // no auxiliary buffer PFD_MAIN_PLANE, // main layer 0, // reserved 0, 0, 0 // layer masks ignored }; int nPixelFormat = ChoosePixelFormat(tempHdc, &pfd); if (nPixelFormat == 0) { return false; } BOOL bResult = SetPixelFormat(tempHdc, nPixelFormat, &pfd); if (!bResult) { return false; } HGLRC tempContext = wglCreateContext(tempHdc); wglMakeCurrent(tempHdc, tempContext); //3. 有了临时RC之后才能初始化GLEW glewExperimental = GL_TRUE; GLenum err = glewInit(); if (GLEW_OK != err) { AfxMessageBox(_T("GLEW is not initialized!")); } // 清空临时RC和临时窗口 wglMakeCurrent(NULL, NULL); wglDeleteContext(tempContext); ::DestroyWindow(hwnd); return true; } bool CGLRenderer::CreateGLContext(CDC* pDC) { //4. 设定 pixelformat int nPixCount = 0; float fPixAttribs[] = { 0, 0 }; int iPixAttribs[] = { WGL_DRAW_TO_WINDOW_ARB, GL_TRUE, WGL_SUPPORT_OPENGL_ARB, GL_TRUE, WGL_DOUBLE_BUFFER_ARB, GL_TRUE, WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB, WGL_COLOR_BITS_ARB, 32, WGL_DEPTH_BITS_ARB, 24, WGL_STENCIL_BITS_ARB, 8, WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB, WGL_SAMPLE_BUFFERS_ARB, GL_TRUE, // MSAA on,开启多重采样 WGL_SAMPLES_ARB, 4, // 4x MSAA ,多重采样样本数量为4 0 }; //新的查询像素格式的函数 wglChoosePixelFormatARB(pDC->GetSafeHdc(), iPixAttribs, fPixAttribs, 1, &nPixelFormat, (UINT*)&nPixCount); //多重采样时,如果硬件不支持就使用下面的代码关闭多重采样 if (nPixelFormat == -1) { iPixAttribs[18] = 1; wglChoosePixelFormatARB(pDC->GetSafeHdc(), iPixAttribs, fPixAttribs, 1, &nPixelFormat, (UINT*)&nPixCount); } SetPixelFormat(pDC->GetSafeHdc(), nPixelFormat, &pfd); int attribs[] = { WGL_CONTEXT_MAJOR_VERSION_ARB, 3, WGL_CONTEXT_MINOR_VERSION_ARB, 2, //要求返回兼容模式环境,如果不指定或指定为WGL_CONTEXT_CORE_PROFILE_BIT_ARB会返回只包含核心功能的环境 WGL_CONTEXT_PROFILE_MASK_ARB,WGL_CONTEXT_CORE_PROFILE_BIT_ARB, 0 }; if (wglewIsSupported("WGL_ARB_create_context") == 1) { m_hrc = wglCreateContextAttribsARB(pDC->GetSafeHdc(), 0, attribs); wglMakeCurrent(NULL, NULL); wglMakeCurrent(pDC->m_hDC, m_hrc); } if (!m_hrc) return false; return true; } void CGLRenderer::OutputError(const char* funcName) { #ifdef _DEBUG GLenum error = glGetError();//Context删除之后geterror信息无效 switch (error) { case GL_INVALID_ENUM: TRACE("\n\n警告！运行到 %s 有错误，错误函数为GL_INVALID_ENUM，错误提示：%s\n\n", funcName, glewGetErrorString(error)); break; case GL_INVALID_VALUE: TRACE("\n\n警告！运行到 %s 有错误，错误函数为GL_INVALID_VALUE，错误提示：%s\n\n", funcName, glewGetErrorString(error)); break; case GL_INVALID_OPERATION: TRACE("\n\n警告！运行到 %s 有错误，错误函数为GL_INVALID_OPERATION，错误提示：%s\n\n", funcName, glewGetErrorString(error)); break; case GL_STACK_OVERFLOW: TRACE("\n\n警告！运行到 %s 有错误，错误函数为GL_STACK_OVERFLOW，错误提示：%s\n\n", funcName, glewGetErrorString(error)); break; case GL_STACK_UNDERFLOW: TRACE("\n\n警告！运行到 %s 有错误，错误函数为GL_STACK_UNDERFLOW，错误提示：%s\n\n", funcName, glewGetErrorString(error)); break; case GL_OUT_OF_MEMORY: TRACE("\n\n警告！运行到 %s 有错误，错误函数为GL_OUT_OF_MEMORY，错误提示：%s\n\n", funcName, glewGetErrorString(error)); break; default: break; } #endif } void CGLRenderer::PrepareScene(void) { m_pProgram = new CGLProgram(); m_pVertSh = new CGLShader(GL_VERTEX_SHADER); m_pFragSh = new CGLShader(GL_FRAGMENT_SHADER); m_pVertSh->Load(_T("minimal.vert")); m_pFragSh->Load(_T("minimal.frag")); m_pVertSh->Compile(); m_pFragSh->Compile(); m_pProgram->AttachShader(m_pVertSh); m_pProgram->AttachShader(m_pFragSh); m_pProgram->BindAttribLocation(0, "in_Position"); m_pProgram->BindAttribLocation(1, "in_Color"); m_pProgram->Link(); m_pProgram->Use(); SetData(); } void CGLRenderer::SetData() { // First simple object float* vert = new float[9]; // vertex array float* col = new float[9]; // color array vert[0] = -0.3f; vert[1] = 0.5f; vert[2] = -1.0f; vert[3] = -0.8f; vert[4] = -0.5f; vert[5] = -1.0f; vert[6] = 0.2f; vert[7] = -0.5f; vert[8] = -1.0f; col[0] = 1.0f; col[1] = 0.0f; col[2] = 0.0f; col[3] = 0.0f; col[4] = 1.0f; col[5] = 0.0f; col[6] = 0.0f; col[7] = 0.0f; col[8] = 1.0f; // Second simple object float* vert2 = new float[9]; // vertex array vert2[0] = -0.2f; vert2[1] = 0.5f; vert2[2] = -1.0f; vert2[3] = 0.3f; vert2[4] = -0.5f; vert2[5] = -1.0f; vert2[6] = 0.8f; vert2[7] = 0.5f; vert2[8] = -1.0f; // Two VAOs allocation glGenVertexArrays(2, &m_vaoID[0]); // First VAO setup glBindVertexArray(m_vaoID[0]); glGenBuffers(2, m_vboID); glBindBuffer(GL_ARRAY_BUFFER, m_vboID[0]); glBufferData(GL_ARRAY_BUFFER, 9 * sizeof(GLfloat), vert, GL_STATIC_DRAW); glVertexAttribPointer((GLuint)0, 3, GL_FLOAT, GL_FALSE, 0, 0); glEnableVertexAttribArray(0); glBindBuffer(GL_ARRAY_BUFFER, m_vboID[1]); glBufferData(GL_ARRAY_BUFFER, 9 * sizeof(GLfloat), col, GL_STATIC_DRAW); glVertexAttribPointer((GLuint)1, 3, GL_FLOAT, GL_FALSE, 0, 0); glEnableVertexAttribArray(1); // Second VAO setup glBindVertexArray(m_vaoID[1]); glGenBuffers(1, &m_vboID[2]); glBindBuffer(GL_ARRAY_BUFFER, m_vboID[2]); glBufferData(GL_ARRAY_BUFFER, 9 * sizeof(GLfloat), vert2, GL_STATIC_DRAW); glVertexAttribPointer((GLuint)0, 3, GL_FLOAT, GL_FALSE, 0, 0); glEnableVertexAttribArray(0); glBindVertexArray(0); delete[] vert; delete[] vert2; delete[] col; } void CGLRenderer::Reshape(int w, int h) { glViewport(0, 0, w, h); } void CGLRenderer::DrawScene(CDC *pDC) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glBindVertexArray(m_vaoID[0]); // select first VAO glDrawArrays(GL_TRIANGLES, 0, 3); // draw first object glBindVertexArray(m_vaoID[1]); // select second VAO glVertexAttrib3f((GLuint)1, 1.0, 0.0, 0.0); // set constant color attribute glDrawArrays(GL_TRIANGLES, 0, 3); // draw second o