kc3-lang/SDL/src/video/windows/SDL_windowsopengles.c

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• Hash : ab81a559
  Author :
  Date : 2022-06-07T02:01:27
  

  Windows DPI scaling/highdpi support Adds hint "SDL_WINDOWS_DPI_SCALING" which can be set to "1" to change the SDL coordinate system units to be DPI-scaled points, rather than pixels everywhere. This means windows will be appropriately sized, even when created on high-DPI displays with scaling. e.g. requesting a 640x480 window from SDL, on a display with 125% scaling in Windows display settings, will create a window with an 800x600 client area (in pixels). Setting this to "1" implicitly requests process DPI awareness (setting SDL_WINDOWS_DPI_AWARENESS is unnecessary), and forces SDL_WINDOW_ALLOW_HIGHDPI on all windows.

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• src/video/windows/SDL_windowsopengles.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../../SDL_internal.h"
  
  #if SDL_VIDEO_DRIVER_WINDOWS && SDL_VIDEO_OPENGL_EGL
  
  #include "SDL_windowsvideo.h"
  #include "SDL_windowsopengles.h"
  #include "SDL_windowsopengl.h"
  #include "SDL_windowswindow.h"
  
  /* EGL implementation of SDL OpenGL support */
  
  int
  WIN_GLES_LoadLibrary(_THIS, const char *path) {
  
      /* If the profile requested is not GL ES, switch over to WIN_GL functions  */
      if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
  #if SDL_VIDEO_OPENGL_WGL
          WIN_GLES_UnloadLibrary(_this);
          _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
          _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
          _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
          _this->GL_CreateContext = WIN_GL_CreateContext;
          _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
          _this->GL_GetDrawableSize = WIN_GL_GetDrawableSize;
          _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
          _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
          _this->GL_SwapWindow = WIN_GL_SwapWindow;
          _this->GL_DeleteContext = WIN_GL_DeleteContext;
          return WIN_GL_LoadLibrary(_this, path);
  #else
          return SDL_SetError("SDL not configured with OpenGL/WGL support");
  #endif
      }
      
      if (_this->egl_data == NULL) {
          return SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0);
      }
  
      return 0;
  }
  
  SDL_GLContext
  WIN_GLES_CreateContext(_THIS, SDL_Window * window)
  {
      SDL_GLContext context;
      SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
  
  #if SDL_VIDEO_OPENGL_WGL
      if (_this->gl_config.profile_mask != SDL_GL_CONTEXT_PROFILE_ES) {
          /* Switch to WGL based functions */
          WIN_GLES_UnloadLibrary(_this);
          _this->GL_LoadLibrary = WIN_GL_LoadLibrary;
          _this->GL_GetProcAddress = WIN_GL_GetProcAddress;
          _this->GL_UnloadLibrary = WIN_GL_UnloadLibrary;
          _this->GL_CreateContext = WIN_GL_CreateContext;
          _this->GL_MakeCurrent = WIN_GL_MakeCurrent;
          _this->GL_GetDrawableSize = WIN_GL_GetDrawableSize;
          _this->GL_SetSwapInterval = WIN_GL_SetSwapInterval;
          _this->GL_GetSwapInterval = WIN_GL_GetSwapInterval;
          _this->GL_SwapWindow = WIN_GL_SwapWindow;
          _this->GL_DeleteContext = WIN_GL_DeleteContext;
  
          if (WIN_GL_LoadLibrary(_this, NULL) != 0) {
              return NULL;
          }
  
          return WIN_GL_CreateContext(_this, window);
      }
  #endif
  
      context = SDL_EGL_CreateContext(_this, data->egl_surface);
      return context;
  }
  
  void
  WIN_GLES_DeleteContext(_THIS, SDL_GLContext context)
  {
      SDL_EGL_DeleteContext(_this, context);
      WIN_GLES_UnloadLibrary(_this);
  }
  
  SDL_EGL_SwapWindow_impl(WIN)
  SDL_EGL_MakeCurrent_impl(WIN)
  
  void
  WIN_GLES_GetDrawableSize(_THIS, SDL_Window* window, int* w, int* h)
  {
      WIN_GetDrawableSize(window, w, h);
  }
  
  int
  WIN_GLES_SetupWindow(_THIS, SDL_Window * window)
  {
      /* The current context is lost in here; save it and reset it. */
      SDL_WindowData *windowdata = (SDL_WindowData *) window->driverdata;
      SDL_Window *current_win = SDL_GL_GetCurrentWindow();
      SDL_GLContext current_ctx = SDL_GL_GetCurrentContext();
  
      if (_this->egl_data == NULL) {
          /* !!! FIXME: commenting out this assertion is (I think) incorrect; figure out why driver_loaded is wrong for ANGLE instead. --ryan. */
          #if 0  /* When hint SDL_HINT_OPENGL_ES_DRIVER is set to "1" (e.g. for ANGLE support), _this->gl_config.driver_loaded can be 1, while the below lines function. */
          SDL_assert(!_this->gl_config.driver_loaded);
          #endif
          if (SDL_EGL_LoadLibrary(_this, NULL, EGL_DEFAULT_DISPLAY, 0) < 0) {
              SDL_EGL_UnloadLibrary(_this);
              return -1;
          }
          _this->gl_config.driver_loaded = 1;
      }
    
      /* Create the GLES window surface */
      windowdata->egl_surface = SDL_EGL_CreateSurface(_this, (NativeWindowType)windowdata->hwnd);
  
      if (windowdata->egl_surface == EGL_NO_SURFACE) {
          return SDL_SetError("Could not create GLES window surface");
      }
  
      return WIN_GLES_MakeCurrent(_this, current_win, current_ctx);    
  }
  
  #endif /* SDL_VIDEO_DRIVER_WINDOWS && SDL_VIDEO_OPENGL_EGL */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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