Stencil.cpp revision dfe082f63e94cde9aee271c94d13de5e7217e036
1/* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include <GLES2/gl2.h> 18 19#include "Properties.h" 20#include "Stencil.h" 21 22namespace android { 23namespace uirenderer { 24 25Stencil::Stencil(): mState(kDisabled) { 26} 27 28uint32_t Stencil::getStencilSize() { 29 return STENCIL_BUFFER_SIZE; 30} 31 32void Stencil::clear() { 33 glClearStencil(0); 34 glClear(GL_STENCIL_BUFFER_BIT); 35} 36 37void Stencil::enableTest() { 38 if (mState != kTest) { 39 enable(); 40 glStencilFunc(GL_LESS, 0x0, 0x1); 41 // We only want to test, let's keep everything 42 glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP); 43 mState = kTest; 44 } 45} 46 47void Stencil::enableWrite() { 48 if (mState != kWrite) { 49 enable(); 50 glStencilFunc(GL_ALWAYS, 0x1, 0x1); 51 // The test always passes so the first two values are meaningless 52 glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE); 53 mState = kWrite; 54 } 55} 56 57void Stencil::enable() { 58 if (!mState == kDisabled) { 59 glEnable(GL_STENCIL_TEST); 60 } 61} 62 63void Stencil::disable() { 64 if (mState != kDisabled) { 65 glDisable(GL_STENCIL_TEST); 66 mState = kDisabled; 67 } 68} 69 70}; // namespace uirenderer 71}; // namespace android 72