Adds support for EXT_occlusion_query_boolean
TRAC #19360
Signed-off-by: Daniel Koch
Authored-by: Shannon Woods
git-svn-id: https://angleproject.googlecode.com/svn/trunk@951 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/Query.cpp b/src/libGLESv2/Query.cpp
new file mode 100644
index 0000000..10edda5
--- /dev/null
+++ b/src/libGLESv2/Query.cpp
@@ -0,0 +1,128 @@
+//
+// Copyright (c) 2012 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// Query.cpp: Implements the gl::Query class
+
+#include "libGLESv2/Query.h"
+
+#include "libGLESv2/main.h"
+
+namespace gl
+{
+
+Query::Query(GLuint id, GLenum type) : RefCountObject(id)
+{
+ mQuery = NULL;
+ mStatus = GL_FALSE;
+ mResult = GL_FALSE;
+ mType = type;
+}
+
+Query::~Query()
+{
+ if (mQuery != NULL)
+ {
+ mQuery->Release();
+ mQuery = NULL;
+ }
+}
+
+void Query::begin()
+{
+ if (mQuery == NULL)
+ {
+ if (FAILED(getDevice()->CreateQuery(D3DQUERYTYPE_OCCLUSION, &mQuery)))
+ {
+ return error(GL_OUT_OF_MEMORY);
+ }
+ }
+
+ HRESULT result = mQuery->Issue(D3DISSUE_BEGIN);
+ ASSERT(SUCCEEDED(result));
+}
+
+void Query::end()
+{
+ if (mQuery == NULL)
+ {
+ return error(GL_INVALID_OPERATION);
+ }
+
+ HRESULT result = mQuery->Issue(D3DISSUE_END);
+ ASSERT(SUCCEEDED(result));
+
+ mStatus = GL_FALSE;
+ mResult = GL_FALSE;
+}
+
+GLuint Query::getResult()
+{
+ if (mQuery != NULL)
+ {
+ while (!testQuery())
+ {
+ Sleep(0);
+ // explicitly check for device loss
+ // some drivers seem to return S_FALSE even if the device is lost
+ // instead of D3DERR_DEVICELOST like they should
+ if (gl::getDisplay()->testDeviceLost())
+ {
+ gl::getDisplay()->notifyDeviceLost();
+ return error(GL_OUT_OF_MEMORY, 0);
+ }
+ }
+ }
+
+ return (GLuint)mResult;
+}
+
+GLboolean Query::isResultAvailable()
+{
+ if (mQuery != NULL)
+ {
+ testQuery();
+ }
+
+ return mStatus;
+}
+
+GLenum Query::getType() const
+{
+ return mType;
+}
+
+GLboolean Query::testQuery()
+{
+ if (mQuery != NULL && mStatus != GL_TRUE)
+ {
+ DWORD numPixels = 0;
+
+ HRESULT hres = mQuery->GetData(&numPixels, sizeof(DWORD), D3DGETDATA_FLUSH);
+ if (hres == S_OK)
+ {
+ mStatus = GL_TRUE;
+
+ switch (mType)
+ {
+ case GL_ANY_SAMPLES_PASSED_EXT:
+ case GL_ANY_SAMPLES_PASSED_CONSERVATIVE_EXT:
+ mResult = (numPixels > 0) ? GL_TRUE : GL_FALSE;
+ break;
+ default:
+ ASSERT(false);
+ }
+ }
+ else if (checkDeviceLost(hres))
+ {
+ return error(GL_OUT_OF_MEMORY, GL_TRUE);
+ }
+
+ return mStatus;
+ }
+
+ return GL_TRUE; // prevent blocking when query is null
+}
+}