8ce00301a0
Bug #7146141 When non-rectangular clipping occurs in a layer the render buffer used as the stencil buffer is not cached. If this happens on a View's hardware layer the render buffer will live for as long as the layer is bound to the view. When a stencil buffer is required because of a call to Canvas.saveLayer() it will be allocated on every frame. A future change will address this problem. If "show GPU overdraw" is enabled, non-rectangular clips are not supported anymore and we fall back to rectangular clips instead. This is a limitation imposed by OpenGL ES that cannot be worked around at this time. This change also improves the Matrix4 implementation to easily detect when a rect remains a rect after transform. Change-Id: I0e69fb901792d38bc0c4ca1bf9fdb02d7db415b9
93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <GLES2/gl2.h>
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#include "Properties.h"
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#include "Stencil.h"
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namespace android {
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namespace uirenderer {
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Stencil::Stencil(): mState(kDisabled) {
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}
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uint32_t Stencil::getStencilSize() {
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return STENCIL_BUFFER_SIZE;
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}
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void Stencil::clear() {
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glClearStencil(0);
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glClear(GL_STENCIL_BUFFER_BIT);
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}
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void Stencil::enableTest() {
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if (mState != kTest) {
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enable();
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glStencilFunc(GL_EQUAL, 0xff, 0xff);
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// We only want to test, let's keep everything
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glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
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glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
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mState = kTest;
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}
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}
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void Stencil::enableWrite() {
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if (mState != kWrite) {
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enable();
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glStencilFunc(GL_ALWAYS, 0xff, 0xff);
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// The test always passes so the first two values are meaningless
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glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
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glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
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mState = kWrite;
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}
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}
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void Stencil::enableDebugTest(GLint value, bool greater) {
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enable();
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glStencilFunc(greater ? GL_LESS : GL_EQUAL, value, 0xffffffff);
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// We only want to test, let's keep everything
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glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
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mState = kTest;
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}
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void Stencil::enableDebugWrite() {
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if (mState != kWrite) {
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enable();
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glStencilFunc(GL_ALWAYS, 0x1, 0xffffffff);
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// The test always passes so the first two values are meaningless
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glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
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glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
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mState = kWrite;
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}
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}
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void Stencil::enable() {
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if (mState == kDisabled) {
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glEnable(GL_STENCIL_TEST);
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}
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}
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void Stencil::disable() {
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if (mState != kDisabled) {
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glDisable(GL_STENCIL_TEST);
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mState = kDisabled;
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}
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}
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}; // namespace uirenderer
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}; // namespace android
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