gl_platform.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <EGL/egl.h>
   4 #include <GLES/gl.h>
   5
   6 #include "gl.h"
   7 #include "gl_platform.h"
   8
   9 #ifdef VCOS_VERSION
  10
  11 /*
  12  * hacks for Broadcom VideoCore / Raspberry Pi..
  13  * Why do I have to do this proprietary API stuff,
  14  * couldn't they implement EGL properly? D:
  15  */
  16 #include <bcm_host.h>
  17 #include <X11/Xlib.h>
  18 #include <dlfcn.h>
  19
  20 static Display *x11display;
  21 static Window x11window;
  22 static DISPMANX_DISPLAY_HANDLE_T m_dispmanDisplay;
  23 static EGL_DISPMANX_WINDOW_T m_nativeWindow;
  24
  25 static void *x11lib;
  26 #define FPTR(f) typeof(f) * p##f
  27 static FPTR(XGetGeometry);
  28 static FPTR(XGetWindowAttributes);
  29 static FPTR(XTranslateCoordinates);
  30
  31 static void get_window_rect(VC_RECT_T *rect)
  32 {
  33         XWindowAttributes xattrs_root;
  34         uint32_t disp_w = 0, disp_h = 0;
  35         int dx = 0, dy = 0;
  36         unsigned int dw = 0, dh = 0, dummy;
  37         Window root, dummyw;
  38
  39         graphics_get_display_size(0, &disp_w, &disp_h);
  40         if (disp_w == 0 || disp_h == 0)
  41                 fprintf(stderr, "ERROR: graphics_get_display_size is broken\n");
  42
  43         // default to fullscreen
  44         rect->x = rect->y = 0;
  45         rect->width = disp_w;
  46         rect->height = disp_h;
  47
  48         if (x11display == NULL || x11window == 0)
  49                 return; // use fullscreen
  50
  51         pXGetGeometry(x11display, x11window, &root, &dx, &dy, &dw, &dh,
  52                 &dummy, &dummy);
  53         pXGetWindowAttributes(x11display, root, &xattrs_root);
  54
  55         if (dw == xattrs_root.width && dh == xattrs_root.height)
  56                 return; // use fullscreen
  57
  58         pXTranslateCoordinates(x11display, x11window, root,
  59                 dx, dy, &dx, &dy, &dummyw);
  60
  61         // how to deal with that weird centering thing?
  62         // this is not quite right..
  63         dx += (disp_w - xattrs_root.width) / 2;
  64         dy += (disp_h - xattrs_root.height) / 2;
  65
  66         rect->x = dx;
  67         rect->y = dy;
  68         rect->width = dw;
  69         rect->height = dh;
  70 }
  71
  72 static void submit_rect(void)
  73 {
  74         DISPMANX_UPDATE_HANDLE_T m_dispmanUpdate;
  75         DISPMANX_ELEMENT_HANDLE_T m_dispmanElement;
  76         VC_RECT_T srcRect = { 0, }; // unused, but we segfault without passing it??
  77         VC_RECT_T dstRect;
  78
  79         get_window_rect(&dstRect);
  80
  81         m_dispmanDisplay = vc_dispmanx_display_open(0);
  82         m_dispmanUpdate = vc_dispmanx_update_start(0);
  83
  84         m_dispmanElement = vc_dispmanx_element_add(m_dispmanUpdate,
  85                 m_dispmanDisplay, 0, &dstRect, 0, &srcRect,
  86                 DISPMANX_PROTECTION_NONE, 0, 0, DISPMANX_NO_ROTATE);
  87
  88         m_nativeWindow.element = m_dispmanElement;
  89         m_nativeWindow.width = dstRect.width;
  90         m_nativeWindow.height = dstRect.height;
  91
  92         vc_dispmanx_update_submit_sync(m_dispmanUpdate);
  93 }
  94
  95 int gl_platform_init(void **display, void **window, int *quirks)
  96 {
  97         x11display = NULL;
  98         x11window = 0;
  99
 100         x11lib = dlopen("libX11.so.6", RTLD_LAZY);
 101         if (x11lib != NULL) {
 102                 pXGetGeometry = dlsym(x11lib, "XGetGeometry");
 103                 pXGetWindowAttributes = dlsym(x11lib, "XGetWindowAttributes");
 104                 pXTranslateCoordinates = dlsym(x11lib, "XTranslateCoordinates");
 105                 if (pXGetGeometry != NULL && pXGetWindowAttributes != NULL
 106                     && pXTranslateCoordinates != NULL)
 107                 {
 108                         x11display = *display;
 109                         x11window = (Window)*window;
 110                 }
 111         }
 112
 113         bcm_host_init();
 114         submit_rect();
 115
 116         *display = EGL_DEFAULT_DISPLAY;
 117         *window = &m_nativeWindow;
 118         *quirks |= GL_QUIRK_ACTIVATE_RECREATE;
 119
 120         return 0;
 121 }
 122
 123 void gl_platform_finish(void)
 124 {
 125         vc_dispmanx_display_close(m_dispmanDisplay);
 126         bcm_host_deinit();
 127
 128         if (x11lib) {
 129                 dlclose(x11lib);
 130                 x11lib = NULL;
 131         }
 132
 133         x11display = NULL;
 134         x11window = 0;
 135 }
 136
 137 #else
 138
 139 int gl_platform_init(void **display, void **window, int *quirks)
 140 {
 141         return 0;
 142 }
 143
 144 void gl_platform_finish(void)
 145 {
 146 }
 147
 148 #endif