1 // Copyright 2016 The SwiftShader Authors. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 /****************************************************************************** 16 17 @File OGLSimpleCube.cpp 18 19 @Title OpenGL Simple cube application 20 21 @Version 1.0 22 23 @Platform Windows 24 25 @Description Basic window with a cube drawn in it, using libGL (opengl32). 26 Inspired by http://www.cs.rit.edu/~ncs/Courses/570/UserGuide/OpenGLonWin-11.html 27 28 ******************************************************************************/ 29 #include <windows.h> 30 #include <math.h> 31 32 #include <gl\GL.h> 33 34 #define PI 3.14159265 35 #define SCALE_FACTOR 0.5 36 37 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam); 38 39 const char *className = "OpenGL"; 40 const char *windowName = "OpenGL Cube"; 41 int winX = 0, winY = 0; 42 int winWidth = 300, winHeight = 300; 43 float angle = 0.1f; 44 double theta = angle * PI / 180.0; 45 int listIndex; 46 47 // Rotation matrix 48 GLfloat R[16] = { 1, 0, 0, 0, 0, cos(theta), -sin(theta), 0, 0, sin(theta), cos(theta), 0, 0, 0, 0, 1 }; 49 50 // Scaling matrix 51 GLfloat S[16] = { SCALE_FACTOR, 0, 0, 0, 0, SCALE_FACTOR, 0, 0, 0, 0, SCALE_FACTOR, 0, 0, 0, 0, 1 }; 52 53 HDC hDC; 54 HGLRC hGLRC; 55 HPALETTE hPalette; 56 57 GLfloat vertices1[] = { 58 0.5F, 0.5F, 0.5F, -0.5F, 0.5F, 0.5F, -0.5F, -0.5F, 0.5F, 0.5F, -0.5F, 0.5F, 59 -0.5F, -0.5F, -0.5F, -0.5F, 0.5F, -0.5F, 0.5F, 0.5F, -0.5F, 0.5F, -0.5F, -0.5F, 60 0.5F, 0.5F, 0.5F, 0.5F, 0.5F, -0.5F, -0.5F, 0.5F, -0.5F, -0.5F, 0.5F, 0.5F, 61 -0.5F, -0.5F, -0.5F, 0.5F, -0.5F, -0.5F, 0.5F, -0.5F, 0.5F, -0.5F, -0.5F, 0.5F, 62 0.5F, 0.5F, 0.5F, 0.5F, -0.5F, 0.5F, 0.5F, -0.5F, -0.5F, 0.5F, 0.5F, -0.5F, 63 -0.5F, -0.5F, -0.5F, -0.5F, -0.5F, 0.5F, -0.5F, 0.5F, 0.5F, -0.5F, 0.5F, -0.5F 64 }; 65 66 GLfloat normals1[] = { 67 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 68 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 69 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 70 0, -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 71 1, 0, 0, 1, 0, 0, 1, 0, 0, 1, 0, 0, 72 -1, 0, 0, -1, 0, 0, -1, 0, 0, -1, 0, 0 73 }; 74 75 GLfloat colors1[] = { 76 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 77 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 1, 0, 78 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 0, 0, 79 0, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 80 1, 1, 1, 1, 0, 1, 0, 0, 1, 0, 0, 0, 81 0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1 82 }; 83 84 void initializeView(void) 85 { 86 // Set viewing projection 87 glMatrixMode(GL_PROJECTION); 88 glFrustum(-0.5, 0.5, -0.5, 0.5, 1.0, 3.0); 89 90 // Position viewer 91 glMatrixMode(GL_MODELVIEW); 92 glTranslatef(0.0F, 0.0F, -2.0F); 93 94 // Position object 95 glRotatef(30.0F, 1.0F, 0.0F, 0.0F); 96 glRotatef(30.0F, 0.0F, 1.0F, 0.0F); 97 98 glEnable(GL_DEPTH_TEST); 99 glEnable(GL_COLOR_MATERIAL); 100 } 101 102 void initDisplayList(void) 103 { 104 listIndex = glGenLists(1); 105 glNewList(listIndex, GL_COMPILE); 106 glNormalPointer(GL_FLOAT, 0, normals1); 107 glColorPointer(3, GL_FLOAT, 0, colors1); 108 glVertexPointer(3, GL_FLOAT, 0, vertices1); 109 110 glEnableClientState(GL_NORMAL_ARRAY); 111 glEnableClientState(GL_COLOR_ARRAY); 112 glEnableClientState(GL_VERTEX_ARRAY); 113 114 glPushMatrix(); 115 glMultMatrixf(S); 116 glDrawArrays(GL_QUADS, 0, 24); 117 glPopMatrix(); 118 119 glDisableClientState(GL_VERTEX_ARRAY); 120 glDisableClientState(GL_COLOR_ARRAY); 121 glDisableClientState(GL_NORMAL_ARRAY); 122 glEndList(); 123 } 124 125 void redraw(void) 126 { 127 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 128 glCallList(listIndex); 129 130 // Rotation 131 glMultMatrixf(R); 132 133 SwapBuffers(hDC); 134 } 135 136 void resize(void) 137 { 138 // Set viewport to cover the window 139 glViewport(0, 0, winWidth, winHeight); 140 } 141 142 void setupPixelFormat(HDC hDC) 143 { 144 PIXELFORMATDESCRIPTOR pfd = { 145 sizeof(PIXELFORMATDESCRIPTOR), // Size 146 1, // Version 147 PFD_SUPPORT_OPENGL | 148 PFD_DRAW_TO_WINDOW | 149 PFD_DOUBLEBUFFER, // Support double-buffering 150 PFD_TYPE_RGBA, // Color type 151 16, // Prefered color depth 152 0, 0, 0, 0, 0, 0, // Color bits (ignored) 153 0, // No alpha buffer 154 0, // Alpha bits (ignored) 155 0, // No accumulation buffer 156 0, 0, 0, 0, // Accum bits (ignored) 157 16, // Depth buffer 158 0, // No stencil buffer 159 0, // No auxiliary buffers 160 PFD_MAIN_PLANE, // Main layer 161 0, // Reserved 162 0, 0, 0, // No layer, visible, damage masks 163 }; 164 int pixelFormat; 165 166 pixelFormat = ChoosePixelFormat(hDC, &pfd); 167 if(pixelFormat == 0) { 168 MessageBox(WindowFromDC(hDC), L"ChoosePixelFormat failed.", L"Error", 169 MB_ICONERROR | MB_OK); 170 exit(1); 171 } 172 173 if(SetPixelFormat(hDC, pixelFormat, &pfd) != TRUE) { 174 MessageBox(WindowFromDC(hDC), L"SetPixelFormat failed.", L"Error", 175 MB_ICONERROR | MB_OK); 176 exit(1); 177 } 178 } 179 180 int __stdcall WinMain(__in HINSTANCE hCurrentInst, __in_opt HINSTANCE hPreviousInst, __in_opt LPSTR lpCmdLine, __in int nShowCmd) 181 { 182 WNDCLASS wndClass; 183 HWND hWnd; 184 MSG msg; 185 186 // Register window class 187 wndClass.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW; 188 wndClass.lpfnWndProc = WndProc; 189 wndClass.cbClsExtra = 0; 190 wndClass.cbWndExtra = 0; 191 wndClass.hInstance = hCurrentInst; 192 wndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION); 193 wndClass.hCursor = LoadCursor(NULL, IDC_ARROW); 194 wndClass.hbrBackground = (HBRUSH)BLACK_BRUSH; 195 wndClass.lpszMenuName = NULL; 196 wndClass.lpszClassName = L"OpenGL cube"; 197 RegisterClass(&wndClass); 198 199 // Create window 200 hWnd = CreateWindow( 201 L"OpenGL cube", L"OpenGL", 202 WS_OVERLAPPEDWINDOW, 203 winX, winY, winWidth, winHeight, 204 NULL, NULL, hCurrentInst, NULL); 205 206 // Display window 207 ShowWindow(hWnd, nShowCmd); 208 209 hDC = GetDC(hWnd); 210 setupPixelFormat(hDC); 211 hGLRC = wglCreateContext(hDC); 212 wglMakeCurrent(hDC, hGLRC); 213 initializeView(); 214 initDisplayList(); 215 216 while(true) 217 { 218 if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) 219 { 220 if(msg.message == WM_QUIT) 221 { 222 break; 223 } 224 225 TranslateMessage(&msg); 226 DispatchMessage(&msg); 227 } 228 else 229 { 230 redraw(); 231 } 232 } 233 234 wglMakeCurrent(NULL, NULL); 235 wglDeleteContext(hGLRC); 236 ReleaseDC(hWnd, hDC); 237 238 return msg.wParam; 239 } 240 241 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) 242 { 243 switch(message) { 244 case WM_DESTROY: 245 // Finish OpenGL rendering 246 if(hGLRC) { 247 wglMakeCurrent(NULL, NULL); 248 wglDeleteContext(hGLRC); 249 } 250 if(hPalette) { 251 DeleteObject(hPalette); 252 } 253 ReleaseDC(hWnd, hDC); 254 PostQuitMessage(0); 255 return 0; 256 case WM_SIZE: 257 // Track window size changes 258 if(hGLRC) { 259 winWidth = (int)LOWORD(lParam); 260 winHeight = (int)HIWORD(lParam); 261 resize(); 262 return 0; 263 } 264 case WM_PALETTECHANGED: 265 // Realize palette if this is *not* the current window 266 if(hGLRC && hPalette && (HWND)wParam != hWnd) { 267 UnrealizeObject(hPalette); 268 SelectPalette(hDC, hPalette, FALSE); 269 RealizePalette(hDC); 270 redraw(); 271 break; 272 } 273 break; 274 case WM_QUERYNEWPALETTE: 275 // Realize palette if this is the current window 276 if(hGLRC && hPalette) { 277 UnrealizeObject(hPalette); 278 SelectPalette(hDC, hPalette, FALSE); 279 RealizePalette(hDC); 280 return TRUE; 281 } 282 break; 283 default: 284 break; 285 } 286 287 return DefWindowProc(hWnd, message, wParam, lParam); 288 }
