initial EGL code

1 files changed, 226 insertions, 0 deletions

diff --git a/src/egl/main/eglcontext.c b/src/egl/main/eglcontext.c
new file mode 100644
index 00000000000..e7d833e24ff
--- /dev/null
+++ b/src/egl/main/eglcontext.c
@@ -0,0 +1,226 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+#include "eglconfig.h"
+#include "eglcontext.h"
+#include "egldriver.h"
+#include "eglglobals.h"
+#include "eglhash.h"
+#include "eglsurface.h"
+
+
+/**
+ * Initialize the given _EGLContext object to defaults.
+ */
+void
+_eglInitContext(_EGLContext *ctx)
+{
+   /* just init to zer for now */
+   memset(ctx, 0, sizeof(_EGLContext));
+}
+
+
+/*
+ * Assign an EGLContext handle to the _EGLContext object then put it into
+ * the hash table.
+ */
+void
+_eglSaveContext(_EGLContext *ctx)
+{
+   assert(ctx);
+   ctx->Handle = _eglHashGenKey(_eglGlobal.Contexts);
+   _eglHashInsert(_eglGlobal.Contexts, ctx->Handle, ctx);
+}
+
+
+/**
+ * Remove the given _EGLContext object from the hash table.
+ */
+void
+_eglRemoveContext(_EGLContext *ctx)
+{
+   _eglHashRemove(_eglGlobal.Contexts, ctx->Handle);
+}
+
+
+/**
+ * Return the _EGLContext object that corresponds to the given
+ * EGLContext handle.
+ */
+_EGLContext *
+_eglLookupContext(EGLContext ctx)
+{
+   _EGLContext *c = (_EGLContext *) _eglHashLookup(_eglGlobal.Contexts, ctx);
+   return c;
+}
+
+
+/**
+ * Return the currently bound _EGLContext object, or NULL.
+ */
+_EGLContext *
+_eglGetCurrentContext(void)
+{
+   /* XXX this should be per-thread someday */
+   return _eglGlobal.CurrentContext;
+}
+
+
+/**
+ * Just a placeholder/demo function.  Real driver will never use this!
+ */
+EGLContext
+_eglCreateContext(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, EGLContext share_list, const EGLint *attrib_list)
+{
+   _EGLConfig *conf = _eglLookupConfig(drv, dpy, config);
+   if (!conf) {
+      _eglError(EGL_BAD_CONFIG, "eglCreateContext");
+      return EGL_NO_CONTEXT;
+   }
+
+   if (share_list != EGL_NO_CONTEXT) {
+      _EGLContext *shareCtx = _eglLookupContext(share_list);
+      if (!shareCtx) {
+         _eglError(EGL_BAD_CONTEXT, "eglCreateContext(share_list)");
+         return EGL_NO_CONTEXT;
+      }
+   }
+
+   return EGL_NO_CONTEXT;
+}
+
+
+/**
+ * Default fallback routine - drivers should usually override this.
+ */
+EGLBoolean
+_eglDestroyContext(_EGLDriver *drv, EGLDisplay dpy, EGLContext ctx)
+{
+   _EGLContext *context = _eglLookupContext(ctx);
+   if (context) {
+      _eglHashRemove(_eglGlobal.Contexts, ctx);
+      if (context->IsBound) {
+         context->DeletePending = EGL_TRUE;
+      }
+      else {
+         free(context);
+      }
+      return EGL_TRUE;
+   }
+   else {
+      _eglError(EGL_BAD_CONTEXT, "eglDestroyContext");
+      return EGL_TRUE;
+   }
+}
+
+
+EGLBoolean
+_eglQueryContext(_EGLDriver *drv, EGLDisplay dpy, EGLContext ctx, EGLint attribute, EGLint *value)
+{
+   _EGLContext *c = _eglLookupContext(ctx);
+
+   (void) drv;
+   (void) dpy;
+
+   if (!c) {
+      _eglError(EGL_BAD_CONTEXT, "eglQueryContext");
+      return EGL_FALSE;
+   }
+
+   switch (attribute) {
+   case EGL_CONFIG_ID:
+      *value = GET_CONFIG_ATTRIB(c->Config, EGL_CONFIG_ID);
+      return EGL_TRUE;
+   default:
+      _eglError(EGL_BAD_ATTRIBUTE, "eglQueryContext");
+      return EGL_FALSE;
+   }
+}
+
+
+/**
+ * Drivers will typically call this to do the error checking and
+ * update the various IsBound and DeletePending flags.
+ * Then, the driver will do its device-dependent Make-Current stuff.
+ */
+EGLBoolean
+_eglMakeCurrent(_EGLDriver *drv, EGLDisplay dpy, EGLSurface d, EGLSurface r, EGLContext context)
+{
+   _EGLContext *ctx = _eglLookupContext(context);
+   _EGLSurface *draw = _eglLookupSurface(d);
+   _EGLSurface *read = _eglLookupSurface(r);
+
+   _EGLContext *oldContext = _eglGetCurrentContext();
+   _EGLSurface *oldDrawSurface = _eglGetCurrentSurface(EGL_DRAW);
+   _EGLSurface *oldReadSurface = _eglGetCurrentSurface(EGL_READ);
+
+   /* error checking */
+   if (ctx) {
+      if (draw == NULL || read == NULL) {
+         _eglError(EGL_BAD_MATCH, "eglMakeCurrent");
+         return EGL_FALSE;
+      }
+      if (draw->Config != ctx->Config) {
+         _eglError(EGL_BAD_MATCH, "eglMakeCurrent");
+         return EGL_FALSE;
+      }
+      if (read->Config != ctx->Config) {
+         _eglError(EGL_BAD_MATCH, "eglMakeCurrent");
+         return EGL_FALSE;
+      }
+   }
+
+   /*
+    * check if the old context or surfaces need to be deleted
+    */
+   if (oldDrawSurface != NULL) {
+      oldDrawSurface->IsBound = EGL_FALSE;
+      if (oldDrawSurface->DeletePending) {
+         /* make sure we don't try to rebind a deleted surface */
+         if (draw == oldDrawSurface || draw == oldReadSurface) {
+            draw = NULL;
+         }
+         /* really delete surface now */
+         drv->DestroySurface(drv, dpy, oldDrawSurface->Handle);
+      }
+   }
+   if (oldReadSurface != NULL && oldReadSurface != oldDrawSurface) {
+      oldReadSurface->IsBound = EGL_FALSE;
+      if (oldReadSurface->DeletePending) {
+         /* make sure we don't try to rebind a deleted surface */
+         if (read == oldDrawSurface || read == oldReadSurface) {
+            read = NULL;
+         }
+         /* really delete surface now */
+         drv->DestroySurface(drv, dpy, oldReadSurface->Handle);
+      }
+   }
+   if (oldContext != NULL) {
+      oldContext->IsBound = EGL_FALSE;
+      if (oldContext->DeletePending) {
+         /* make sure we don't try to rebind a deleted context */
+         if (ctx == oldContext) {
+            ctx = NULL;
+         }
+         /* really delete context now */
+         drv->DestroyContext(drv, dpy, oldContext->Handle);
+      }
+   }
+
+   if (ctx) {
+      /* check read/draw again, in case we deleted them above */
+      if (draw == NULL || read == NULL) {
+         _eglError(EGL_BAD_MATCH, "eglMakeCurrent");
+         return EGL_FALSE;
+      }
+      ctx->DrawSurface = draw;
+      ctx->ReadSurface = read;
+      ctx->IsBound = EGL_TRUE;
+      draw->IsBound = EGL_TRUE;
+      read->IsBound = EGL_TRUE;
+   }
+
+   _eglGlobal.CurrentContext = ctx;
+
+   return EGL_TRUE;
+}