src/modules/engines/gl_glew/evas_glew_win32_main.c

   1 #include "evas_engine.h"
   2
   3 #ifdef HAVE_GL_GLEW_H
   4 # include <GL/wglew.h>
   5 #endif
   6
   7 static Evas_GL_Glew_Window *_evas_gl_glew_window = NULL;
   8
   9 Evas_GL_Glew_Window *
  10 eng_window_new(HWND  window,
  11                int   depth,
  12                int   width,
  13                int   height)
  14 {
  15    PIXELFORMATDESCRIPTOR pfd;
  16    Evas_GL_Glew_Window  *gw;
  17    int                   format;
  18
  19    gw = calloc(1, sizeof(Evas_GL_Glew_Window));
  20    if (!gw) return NULL;
  21
  22    gw->window = window;
  23    gw->depth = depth;
  24
  25    gw->dc = GetDC(window);
  26    if (!gw->dc)
  27     goto free_window;
  28
  29    ZeroMemory(&pfd, sizeof (pfd));
  30    pfd.nSize = sizeof (pfd);
  31    pfd.nVersion = 1;
  32    pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
  33    pfd.iPixelType = PFD_TYPE_RGBA;
  34    pfd.cColorBits = 24;
  35    pfd.cDepthBits = 32;
  36    pfd.iLayerType = PFD_MAIN_PLANE;
  37
  38    format = ChoosePixelFormat(gw->dc, &pfd);
  39    if (!format)
  40      goto release_dc;
  41
  42    SetPixelFormat(gw->dc, format, &pfd);
  43
  44    if (pfd.iPixelType != PFD_TYPE_RGBA)
  45      goto release_dc;
  46
  47    gw->context = wglCreateContext(gw->dc);
  48    if (!gw->context)
  49      goto release_dc;
  50
  51    wglMakeCurrent(gw->dc, gw->context);
  52
  53    if (glewInit() != GLEW_OK)
  54      goto delete_context;
  55
  56    if (!GLEW_VERSION_2_0)
  57      {
  58         fprintf(stderr, "\nERROR: OpenGL 2.0 not supported. Exiting...\n\n");
  59         goto delete_context;
  60      }
  61
  62    _evas_gl_glew_window = gw;
  63
  64    gw->gl_context = evas_gl_common_context_new();
  65    if (!gw->gl_context)
  66      goto delete_context;
  67    evas_gl_common_context_resize(gw->gl_context, width, height);
  68
  69    return gw;
  70
  71  delete_context:
  72    wglMakeCurrent(NULL, NULL);
  73    wglDeleteContext(gw->context);
  74  release_dc:
  75    ReleaseDC(window, gw->dc);
  76  free_window:
  77    free(gw);
  78
  79    return NULL;
  80 }
  81
  82 void
  83 eng_window_free(Evas_GL_Glew_Window *gw)
  84 {
  85    if (!gw)
  86      return;
  87    if (gw == _evas_gl_glew_window) _evas_gl_glew_window = NULL;
  88    evas_gl_common_context_free(gw->gl_context);
  89    wglMakeCurrent(NULL, NULL);
  90    wglDeleteContext(gw->context);
  91    ReleaseDC(gw->window, gw->dc);
  92    free(gw);
  93 }
  94
  95 void
  96 eng_window_use(Evas_GL_Glew_Window *gw)
  97 {
  98    if (_evas_gl_glew_window != gw)
  99      {
 100         if (_evas_gl_glew_window)
 101           evas_gl_common_context_flush(_evas_gl_glew_window->gl_context);
 102         _evas_gl_glew_window = gw;
 103         wglMakeCurrent(gw->dc, gw->context);
 104      }
 105    evas_gl_common_context_use(gw->gl_context);
 106 }
 107
 108 void
 109 eng_window_swap_buffers(Evas_GL_Glew_Window *gw)
 110 {
 111    SwapBuffers(gw->dc);
 112 }
 113
 114 void
 115 eng_window_vsync_set(int on)
 116 {
 117 #if 1 /* Using Glew */
 118    wglSwapIntervalEXT(on);
 119 #else /* Using plain OpenGL */
 120    const char *extensions = glGetString(GL_EXTENSIONS);
 121
 122    /* check if WGL_EXT_swap_control extension is supported */
 123    if (strstr(extensions, "WGL_EXT_swap_control") == 0)
 124      return;
 125    else
 126      {
 127         wglSwapIntervalEXT = (PFNWGLSWAPINTERVALFARPROC)wglGetProcAddress("wglSwapIntervalEXT");
 128
 129         if (wglSwapIntervalEXT)
 130           wglSwapIntervalEXT(on);
 131      }
 132 #endif
 133 }