initial EGL code

src/egl/main/egldriver.c

@@ -0,0 +1,226 @@
+#include <assert.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <string.h>
+#include "eglconfig.h"
+#include "eglcontext.h"
+#include "egldisplay.h"
+#include "egldriver.h"
+#include "eglglobals.h"
+#include "eglmode.h"
+#include "eglsurface.h"
+
+
+const char *DefaultDriverName = "demo";
+
+
+/**
+ * Choose and open/init the hardware driver for the given EGLDisplay.
+ * Previously, the EGLDisplay was created with _eglNewDisplay() where
+ * we recorded the user's NativeDisplayType parameter.
+ *
+ * Now we'll use the NativeDisplayType value.
+ *
+ * Currently, the native display value is treated as a string.
+ * If the first character is ':' we interpret it as a screen or card index
+ * number (i.e. ":0" or ":1", etc)
+ * Else if the first character is '!' we interpret it as specific driver name
+ * (i.e. "!r200" or "!i830".
+ */
+_EGLDriver *
+_eglChooseDriver(EGLDisplay display)
+{
+   _EGLDisplay *dpy = _eglLookupDisplay(display);
+   _EGLDriver *drv;
+   const char *driverName = DefaultDriverName;
+   const char *name;
+
+   assert(dpy);
+
+   name = dpy->Name;
+   if (!name) {
+      /* use default */
+   }
+   else if (name[0] == ':' && (name[1] >= '0' && name[1] <= '9') && !name[2]) {
+      printf("EGL: Use driver for screen: %s\n", name);
+      /* XXX probe hardware here to determine which driver to open */
+      /* driverName = "something"; */
+   }
+   else if (name[0] == '!') {
+      /* use specified driver name */
+      driverName = name + 1;
+      printf("EGL: Use driver named %s\n", driverName);
+   }
+   else {
+      /* Maybe display was returned by XOpenDisplay? */
+      printf("EGL: can't parse display pointer\n");
+   }
+
+   drv = _eglOpenDriver(dpy, driverName);
+   dpy->Driver = drv;
+
+   return drv;
+}
+
+
+/**
+ * Open/load the named driver and call its bootstrap function: _eglMain().
+ * \return  new _EGLDriver object.
+ */
+_EGLDriver *
+_eglOpenDriver(_EGLDisplay *dpy, const char *driverName)
+{
+   void *lib;
+   char driverFilename[1000];
+
+   /* XXX also prepend a directory path??? */
+   sprintf(driverFilename, "%sdriver.so", driverName);
+
+#if 1
+   lib = dlopen(driverFilename, RTLD_NOW);
+   if (lib) {
+      _EGLDriver *drv;
+      _EGLMain_t mainFunc;
+
+      mainFunc = (_EGLMain_t) dlsym(lib, "_eglMain");
+      if (!mainFunc) {
+         fprintf(stderr, "_eglMain not found in %s", (char *) driverFilename);
+         dlclose(lib);
+         return NULL;
+      }
+
+      drv = mainFunc(dpy);
+      if (!drv) {
+         dlclose(lib);
+         return NULL;
+      }
+
+      drv->LibHandle = lib;
+      drv->Display = dpy;
+      return drv;
+   }
+   else {
+      fprintf(stderr, "EGLdebug: Error opening %s: %s\n",
+              driverFilename, dlerror());
+      return NULL;
+   }
+#else
+   /* use built-in driver */
+   return _eglDefaultMain(d);
+#endif
+}
+
+
+EGLBoolean
+_eglCloseDriver(_EGLDriver *drv, EGLDisplay dpy)
+{
+   void *handle = drv->LibHandle;
+   EGLBoolean b;
+   fprintf(stderr, "EGL debug: Closing driver\n");
+
+   /*
+    * XXX check for currently bound context/surfaces and delete them?
+    */
+
+   b = drv->Terminate(drv, dpy);
+   dlclose(handle);
+   return b;
+}
+
+
+/**
+ * Given a display handle, return the _EGLDriver for that display.
+ */
+_EGLDriver *
+_eglLookupDriver(EGLDisplay dpy)
+{
+   _EGLDisplay *d = _eglLookupDisplay(dpy);
+   if (d)
+      return d->Driver;
+   else
+      return NULL;
+}
+
+
+/**
+ * Plug all the available fallback routines into the given driver's
+ * dispatch table.
+ */
+void
+_eglInitDriverFallbacks(_EGLDriver *drv)
+{
+   /* If a pointer is set to NULL, then the device driver _really_ has
+    * to implement it.
+    */
+   drv->Initialize = NULL;
+   drv->Terminate = NULL;
+
+   drv->GetConfigs = _eglGetConfigs;
+   drv->ChooseConfig = _eglChooseConfig;
+   drv->GetConfigAttrib = _eglGetConfigAttrib;
+
+   drv->CreateContext = _eglCreateContext;
+   drv->DestroyContext = _eglDestroyContext;
+   drv->MakeCurrent = _eglMakeCurrent;
+   drv->QueryContext = _eglQueryContext;
+
+   drv->CreateWindowSurface = _eglCreateWindowSurface;
+   drv->CreatePixmapSurface = _eglCreatePixmapSurface;
+   drv->CreatePbufferSurface = _eglCreatePbufferSurface;
+   drv->DestroySurface = _eglDestroySurface;
+   drv->QuerySurface = _eglQuerySurface;
+   drv->SurfaceAttrib = _eglSurfaceAttrib;
+   drv->BindTexImage = _eglBindTexImage;
+   drv->ReleaseTexImage = _eglReleaseTexImage;
+   drv->SwapInterval = _eglSwapInterval;
+   drv->SwapBuffers = _eglSwapBuffers;
+   drv->CopyBuffers = _eglCopyBuffers;
+
+   drv->QueryString = _eglQueryString;
+   drv->WaitGL = _eglWaitGL;
+   drv->WaitNative = _eglWaitNative;
+
+   /* EGL_MESA_screen */
+   drv->GetModesMESA = _eglGetModesMESA;
+   drv->GetModeAttribMESA = _eglGetModeAttribMESA;
+}
+
+
+const char *
+_eglQueryString(_EGLDriver *drv, EGLDisplay dpy, EGLint name)
+{
+   (void) drv;
+   (void) dpy;
+   switch (name) {
+   case EGL_VENDOR:
+      return "Mesa Project";
+   case EGL_VERSION:
+      return "1.0";
+   case EGL_EXTENSIONS:
+      return "";
+   default:
+      _eglError(EGL_BAD_PARAMETER, "eglQueryString");
+      return NULL;
+   }
+}
+
+
+EGLBoolean
+_eglWaitGL(_EGLDriver *drv, EGLDisplay dpy)
+{
+   /* just a placeholder */
+   (void) drv;
+   (void) dpy;
+   return EGL_TRUE;
+}
+
+
+EGLBoolean
+_eglWaitNative(_EGLDriver *drv, EGLDisplay dpy, EGLint engine)
+{
+   /* just a placeholder */
+   (void) drv;
+   (void) dpy;
+   (void) engine;
+   return EGL_TRUE;
+}