add some VideCore/R-pi support code

[libpicofe.git] / gl_platform.c

diff --git a/gl_platform.c b/gl_platform.c
new file mode 100644 (file)
index 0000000..74eea8f
--- /dev/null
+++ b/gl_platform.c
@@ -0,0 +1,120 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <EGL/egl.h>
+#include <GLES/gl.h>
+
+#include "gl.h"
+#include "gl_platform.h"
+
+#ifdef VCOS_VERSION
+
+/*
+ * hacks for Broadcom VideoCore / Raspberry Pi..
+ * Why do I have to do this proprietary API stuff,
+ * couldn't they implement EGL properly? D:
+ */
+#include <bcm_host.h>
+#include <X11/Xlib.h>
+
+static Display *x11display;
+static Window x11window;
+static DISPMANX_DISPLAY_HANDLE_T m_dispmanDisplay;
+static EGL_DISPMANX_WINDOW_T m_nativeWindow;
+
+static void get_window_rect(VC_RECT_T *rect)
+{
+       XWindowAttributes xattrs_root;
+       uint32_t disp_w = 0, disp_h = 0;
+       int dx = 0, dy = 0;
+       unsigned int dw = 0, dh = 0, dummy;
+       Window root, dummyw;
+
+       graphics_get_display_size(0, &disp_w, &disp_h);
+       if (disp_w == 0 || disp_h == 0)
+               fprintf(stderr, "ERROR: graphics_get_display_size is broken\n");
+
+       // default to fullscreen
+       rect->x = rect->y = 0;
+       rect->width = disp_w;
+       rect->height = disp_h;
+
+       if (x11display == NULL || x11window == 0)
+               return; // use fullscreen
+
+       XGetGeometry(x11display, x11window, &root, &dx, &dy, &dw, &dh,
+               &dummy, &dummy);
+       XGetWindowAttributes(x11display, root, &xattrs_root);
+
+       if (dw == xattrs_root.width && dh == xattrs_root.height)
+               return; // use fullscreen
+
+       XTranslateCoordinates(x11display, x11window, root,
+               dx, dy, &dx, &dy, &dummyw);
+
+       // how to deal with that weird centering thing?
+       // this is not quite right..
+       dx += (disp_w - xattrs_root.width) / 2;
+       dy += (disp_h - xattrs_root.height) / 2;
+
+       rect->x = dx;
+       rect->y = dy;
+       rect->width = dw;
+       rect->height = dh;
+}
+
+static void submit_rect(void)
+{
+       DISPMANX_UPDATE_HANDLE_T m_dispmanUpdate;
+       DISPMANX_ELEMENT_HANDLE_T m_dispmanElement;
+       VC_RECT_T srcRect = { 0, }; // unused, but we segfault without passing it??
+       VC_RECT_T dstRect;
+
+       get_window_rect(&dstRect);
+
+       m_dispmanDisplay = vc_dispmanx_display_open(0);
+       m_dispmanUpdate = vc_dispmanx_update_start(0);
+
+       m_dispmanElement = vc_dispmanx_element_add(m_dispmanUpdate,
+               m_dispmanDisplay, 0, &dstRect, 0, &srcRect,
+               DISPMANX_PROTECTION_NONE, 0, 0, DISPMANX_NO_ROTATE);
+
+       m_nativeWindow.element = m_dispmanElement;
+       m_nativeWindow.width = dstRect.width;
+       m_nativeWindow.height = dstRect.height;
+
+       vc_dispmanx_update_submit_sync(m_dispmanUpdate);
+}
+
+int gl_platform_init(void **display, void **window, int *quirks)
+{
+       x11display = *display;
+       x11window = (Window)*window;
+
+       bcm_host_init();
+       submit_rect();
+
+       *display = EGL_DEFAULT_DISPLAY;
+       *window = &m_nativeWindow;
+       *quirks |= GL_QUIRK_ACTIVATE_RECREATE;
+
+       return 0;
+}
+
+void gl_platform_finish(void)
+{
+       vc_dispmanx_display_close(m_dispmanDisplay);
+       bcm_host_deinit();
+}
+
+#else
+
+int gl_platform_init(void **display, void **window, int *quirks)
+{
+       return 0;
+}
+
+void gl_platform_finish(void)
+{
+}
+
+#endif