API tools faq
paste
Advertisement
Guest User

Untitled

a guest
Nov 12th, 2019
122
0
Never
Add comment
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
text 8.54 KB | None | 0 0
raw download clone embed print report
  1. // opengl_context.cpp : Defines the entry point for the application.
  2. //
  3.  
  4. #include "stdafx.h"
  5. #include "opengl_context.h"
  6. #include "GLExtensions.h"
  7.  
  8. #include <windows.h> /* must include this before GL/gl.h */
  9. #include <GL/gl.h> /* OpenGL header file */
  10. #include <GL/glu.h> /* OpenGL utilities header file */
  11. #include <stdio.h>
  12. #include <assert.h>
  13.  
  14. #define POLL 1
  15. #define ENABLE_VBO 1
  16. #define RENDER_ITERATIONS 0xf
  17.  
  18. static const GLfloat vertices[] = {
  19. // front
  20. -1.0f, -1.0f, +1.0f,
  21. +1.0f, -1.0f, +1.0f,
  22. -1.0f, +1.0f, +1.0f,
  23. +1.0f, +1.0f, +1.0f,
  24. // back
  25. +1.0f, -1.0f, -1.0f,
  26. -1.0f, -1.0f, -1.0f,
  27. +1.0f, +1.0f, -1.0f,
  28. -1.0f, +1.0f, -1.0f,
  29. // right
  30. +1.0f, -1.0f, +1.0f,
  31. +1.0f, -1.0f, -1.0f,
  32. +1.0f, +1.0f, +1.0f,
  33. +1.0f, +1.0f, -1.0f,
  34. // left
  35. -1.0f, -1.0f, -1.0f,
  36. -1.0f, -1.0f, +1.0f,
  37. -1.0f, +1.0f, -1.0f,
  38. -1.0f, +1.0f, +1.0f,
  39. // top
  40. -1.0f, +1.0f, +1.0f,
  41. +1.0f, +1.0f, +1.0f,
  42. -1.0f, +1.0f, -1.0f,
  43. +1.0f, +1.0f, -1.0f,
  44. // bottom
  45. -1.0f, -1.0f, -1.0f,
  46. +1.0f, -1.0f, -1.0f,
  47. -1.0f, -1.0f, +1.0f,
  48. +1.0f, -1.0f, +1.0f,
  49. };
  50.  
  51. static const GLfloat colors[] = {
  52. // front
  53. 0.0f, 0.0f, 1.0f, // blue
  54. 1.0f, 0.0f, 1.0f, // magenta
  55. 0.0f, 1.0f, 1.0f, // cyan
  56. 1.0f, 1.0f, 1.0f, // white
  57. // back
  58. 1.0f, 0.0f, 0.0f, // red
  59. 0.0f, 0.0f, 0.0f, // black
  60. 1.0f, 1.0f, 0.0f, // yellow
  61. 0.0f, 1.0f, 0.0f, // green
  62. // right
  63. 1.0f, 0.0f, 1.0f, // magenta
  64. 1.0f, 0.0f, 0.0f, // red
  65. 1.0f, 1.0f, 1.0f, // white
  66. 1.0f, 1.0f, 0.0f, // yellow
  67. // left
  68. 0.0f, 0.0f, 0.0f, // black
  69. 0.0f, 0.0f, 1.0f, // blue
  70. 0.0f, 1.0f, 0.0f, // green
  71. 0.0f, 1.0f, 1.0f, // cyan
  72. // top
  73. 0.0f, 1.0f, 1.0f, // cyan
  74. 1.0f, 1.0f, 1.0f, // white
  75. 0.0f, 1.0f, 0.0f, // green
  76. 1.0f, 1.0f, 0.0f, // yellow
  77. // bottom
  78. 0.0f, 0.0f, 0.0f, // black
  79. 1.0f, 0.0f, 0.0f, // red
  80. 0.0f, 0.0f, 1.0f, // blue
  81. 1.0f, 0.0f, 1.0f // magenta
  82. };
  83.  
  84. static const GLfloat normals[] = {
  85. // front
  86. +0.0f, +0.0f, +1.0f, // forward
  87. +0.0f, +0.0f, +1.0f, // forward
  88. +0.0f, +0.0f, +1.0f, // forward
  89. +0.0f, +0.0f, +1.0f, // forward
  90. // back
  91. +0.0f, +0.0f, -1.0f, // backward
  92. +0.0f, +0.0f, -1.0f, // backward
  93. +0.0f, +0.0f, -1.0f, // backward
  94. +0.0f, +0.0f, -1.0f, // backward
  95. // right
  96. +1.0f, +0.0f, +0.0f, // right
  97. +1.0f, +0.0f, +0.0f, // right
  98. +1.0f, +0.0f, +0.0f, // right
  99. +1.0f, +0.0f, +0.0f, // right
  100. // left
  101. -1.0f, +0.0f, +0.0f, // left
  102. -1.0f, +0.0f, +0.0f, // left
  103. -1.0f, +0.0f, +0.0f, // left
  104. -1.0f, +0.0f, +0.0f, // left
  105. // top
  106. +0.0f, +1.0f, +0.0f, // up
  107. +0.0f, +1.0f, +0.0f, // up
  108. +0.0f, +1.0f, +0.0f, // up
  109. +0.0f, +1.0f, +0.0f, // up
  110. // bottom
  111. +0.0f, -1.0f, +0.0f, // down
  112. +0.0f, -1.0f, +0.0f, // down
  113. +0.0f, -1.0f, +0.0f, // down
  114. +0.0f, -1.0f, +0.0f // down
  115. };
  116.  
  117. void
  118. display()
  119. {
  120. /* rotate a triangle around */
  121. glClearColor(0.0, 0.5, 0.5, 1.0);
  122. glClear(GL_COLOR_BUFFER_BIT);
  123.  
  124. #if ENABLE_VBO
  125. glDrawArrays(GL_TRIANGLES, 0, 3);
  126. /*
  127. glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
  128. glDrawArrays(GL_TRIANGLE_STRIP, 4, 4);
  129. glDrawArrays(GL_TRIANGLE_STRIP, 8, 4);
  130. glDrawArrays(GL_TRIANGLE_STRIP, 12, 4);
  131. glDrawArrays(GL_TRIANGLE_STRIP, 16, 4);
  132. glDrawArrays(GL_TRIANGLE_STRIP, 20, 4);
  133. */
  134. #endif
  135.  
  136. glFlush();
  137. }
  138.  
  139.  
  140. LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
  141. {
  142. static int pass = 0;
  143. static PAINTSTRUCT ps;
  144.  
  145. UNREFERENCED_PARAMETER(pass);
  146.  
  147. switch (uMsg) {
  148. case WM_PAINT:
  149. display();
  150. BeginPaint(hWnd, &ps);
  151. EndPaint(hWnd, &ps);
  152.  
  153. return 0;
  154.  
  155. case WM_SIZE:
  156. glViewport(0, 0, LOWORD(lParam), HIWORD(lParam));
  157. PostMessage(hWnd, WM_PAINT, 0, 0);
  158. return 0;
  159.  
  160. case WM_CHAR:
  161. switch (wParam) {
  162. case 27: /* ESC key */
  163. PostQuitMessage(0);
  164. break;
  165. }
  166. return 0;
  167.  
  168. case WM_CLOSE:
  169. PostQuitMessage(0);
  170. return 0;
  171. }
  172.  
  173. return DefWindowProc(hWnd, uMsg, wParam, lParam);
  174. }
  175.  
  176. HWND
  177. CreateOpenGLWindow(char* title, int x, int y, int width, int height,
  178. BYTE type, DWORD flags)
  179. {
  180. int pf;
  181. HDC hDC;
  182. HWND hWnd;
  183. WNDCLASS wc;
  184. PIXELFORMATDESCRIPTOR pfd;
  185. static HINSTANCE hInstance = 0;
  186. const LPCWSTR err1 = L"RegisterClass() failed : Cannot register window class.";
  187. const LPCWSTR err2 = L"CreateWindow() failed : Cannot create a window.";
  188.  
  189. /* only register the window class once - use hInstance as a flag. */
  190. if (!hInstance) {
  191. hInstance = GetModuleHandle(NULL);
  192. wc.style = CS_OWNDC;
  193. wc.lpfnWndProc = (WNDPROC)WndProc;
  194. wc.cbClsExtra = 0;
  195. wc.cbWndExtra = 0;
  196. wc.hInstance = hInstance;
  197. wc.hIcon = LoadIcon(NULL, IDI_WINLOGO);
  198. wc.hCursor = LoadCursor(NULL, IDC_ARROW);
  199. wc.hbrBackground = NULL;
  200. wc.lpszMenuName = NULL;
  201. wc.lpszClassName = L"OpenGL";
  202.  
  203. if (!RegisterClass(&wc)) {
  204. MessageBox(NULL, err1, L"Error", MB_OK);
  205. return NULL;
  206. }
  207. }
  208.  
  209. UNREFERENCED_PARAMETER(title);
  210. hWnd = CreateWindow(L"OpenGL", L"Window Title", WS_OVERLAPPEDWINDOW |
  211. WS_CLIPSIBLINGS | WS_CLIPCHILDREN,
  212. x, y, width, height, NULL, NULL, hInstance, NULL);
  213.  
  214. if (hWnd == NULL) {
  215. MessageBox(NULL, err2, L"Error", MB_OK);
  216. return NULL;
  217. }
  218.  
  219. hDC = GetDC(hWnd);
  220.  
  221. /* there is no guarantee that the contents of the stack that become
  222. the pfd are zeroed, therefore _make sure_ to clear these bits. */
  223. memset(&pfd, 0, sizeof(pfd));
  224. pfd.nSize = sizeof(pfd);
  225. pfd.nVersion = 1;
  226. pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | flags;
  227. pfd.iPixelType = type;
  228. pfd.cColorBits = 32;
  229.  
  230. pf = ChoosePixelFormat(hDC, &pfd);
  231.  
  232. if (pf == 0) {
  233. MessageBox(NULL, L"ChoosePixelFormat() failed: "
  234. "Cannot find a suitable pixel format.", L"Error", MB_OK);
  235. return 0;
  236. }
  237.  
  238. if (SetPixelFormat(hDC, pf, &pfd) == FALSE) {
  239. MessageBox(NULL, L"SetPixelFormat() failed: "
  240. "Cannot set format specified.", L"Error", MB_OK);
  241. return 0;
  242. }
  243.  
  244. DescribePixelFormat(hDC, pf, sizeof(PIXELFORMATDESCRIPTOR), &pfd);
  245.  
  246. ReleaseDC(hWnd, hDC);
  247.  
  248. return hWnd;
  249. }
  250.  
  251.  
  252. int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
  253. _In_opt_ HINSTANCE hPrevInstance,
  254. _In_ LPWSTR lpCmdLine,
  255. _In_ int nCmdShow)
  256. {
  257. HDC hDC; /* device context */
  258. HGLRC hRC; /* opengl context */
  259. HWND hWnd; /* window */
  260. MSG msg; /* message */
  261.  
  262. hWnd = CreateOpenGLWindow("minimal", 0, 0, 256, 256, PFD_TYPE_RGBA, 0);
  263. if (hWnd == NULL)
  264. exit(1);
  265.  
  266. hDC = GetDC(hWnd);
  267. assert(hDC && "hDC context is null");
  268.  
  269. hRC = wglCreateContext(hDC);
  270. wglMakeCurrent(hDC, hRC);
  271. glEnable(GL_CULL_FACE);
  272.  
  273. static const GLfloat g_vertex_buffer_data[] = {
  274. -1.0f, -1.0f, 0.0f,
  275. 1.0f, -1.0f, 0.0f,
  276. 0.0f, 1.0f, 0.0f,
  277. };
  278.  
  279. #if ENABLE_VBO
  280. GLuint vertexbuffer;
  281. // Generate 1 buffer, put the resulting identifier in vertexbuffer
  282. glGenBuffers(1, &vertexbuffer);
  283. // The following commands will talk about our 'vertexbuffer' buffer
  284. glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
  285. // Give our vertices to OpenGL.
  286. glBufferData(GL_ARRAY_BUFFER, sizeof(g_vertex_buffer_data), g_vertex_buffer_data, GL_STATIC_DRAW);
  287.  
  288. glEnableVertexAttribArray(0);
  289. glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer);
  290. glVertexAttribPointer(
  291. 0, // attribute 0. No particular reason for 0, but must match the layout in the shader.
  292. 3, // size
  293. GL_FLOAT, // type
  294. GL_FALSE, // normalized?
  295. 0, // stride
  296. (void*)0 // array buffer offset
  297. );
  298. #endif
  299.  
  300. ShowWindow(hWnd, nCmdShow);
  301.  
  302. #if POLL
  303. UNREFERENCED_PARAMETER(msg);
  304. for (UINT32 i = 0; i < RENDER_ITERATIONS; i++)
  305. display();
  306. #else
  307. while (GetMessage(&msg, hWnd, 0, 0)) {
  308. TranslateMessage(&msg);
  309. DispatchMessage(&msg);
  310. }
  311. #endif
  312.  
  313. wglMakeCurrent(NULL, NULL);
  314. ReleaseDC(hWnd, hDC);
  315. wglDeleteContext(hRC);
  316. DestroyWindow(hWnd);
  317.  
  318. return static_cast<int>(0);
  319. }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement
Public Pastes
Advertisement
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy.  OK, I Understand
Not a member of Pastebin yet?
Sign Up, it unlocks many cool features!