1 files changed, 92 insertions, 0 deletions
diff --git a/libs/hwui/Stencil.cpp b/libs/hwui/Stencil.cpp
new file mode 100644
index 0000000..84df82b
--- /dev/null
+++ b/libs/hwui/Stencil.cpp
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <GLES2/gl2.h>
+
+#include "Properties.h"
+#include "Stencil.h"
+
+namespace android {
+namespace uirenderer {
+
+Stencil::Stencil(): mState(kDisabled) {
+}
+
+uint32_t Stencil::getStencilSize() {
+    return STENCIL_BUFFER_SIZE;
+}
+
+void Stencil::clear() {
+    glClearStencil(0);
+    glClear(GL_STENCIL_BUFFER_BIT);
+}
+
+void Stencil::enableTest() {
+    if (mState != kTest) {
+        enable();
+        glStencilFunc(GL_EQUAL, 0x1, 0x1);
+        // We only want to test, let's keep everything
+        glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+        mState = kTest;
+    }
+}
+
+void Stencil::enableWrite() {
+    if (mState != kWrite) {
+        enable();
+        glStencilFunc(GL_ALWAYS, 0x1, 0x1);
+        // The test always passes so the first two values are meaningless
+        glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
+        glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+        mState = kWrite;
+    }
+}
+
+void Stencil::enableDebugTest(GLint value, bool greater) {
+    enable();
+    glStencilFunc(greater ? GL_LESS : GL_EQUAL, value, 0xffffffff);
+    // We only want to test, let's keep everything
+    glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+    mState = kTest;
+}
+
+void Stencil::enableDebugWrite() {
+    if (mState != kWrite) {
+        enable();
+        glStencilFunc(GL_ALWAYS, 0x1, 0xffffffff);
+        // The test always passes so the first two values are meaningless
+        glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
+        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+        mState = kWrite;
+    }
+}
+
+void Stencil::enable() {
+    if (mState == kDisabled) {
+        glEnable(GL_STENCIL_TEST);
+    }
+}
+
+void Stencil::disable() {
+    if (mState != kDisabled) {
+        glDisable(GL_STENCIL_TEST);
+        mState = kDisabled;
+    }
+}
+
+}; // namespace uirenderer
+}; // namespace android