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
22 namespace android {
23 namespace uirenderer {
24
Stencil()25 Stencil::Stencil(): mState(kDisabled) {
26 }
27
getStencilSize()28 uint32_t Stencil::getStencilSize() {
29 return STENCIL_BUFFER_SIZE;
30 }
31
clear()32 void Stencil::clear() {
33 glClearStencil(0);
34 glClear(GL_STENCIL_BUFFER_BIT);
35 }
36
enableTest()37 void Stencil::enableTest() {
38 if (mState != kTest) {
39 enable();
40 glStencilFunc(GL_EQUAL, 0x1, 0x1);
41 // We only want to test, let's keep everything
42 glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
43 glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
44 mState = kTest;
45 }
46 }
47
enableWrite()48 void Stencil::enableWrite() {
49 if (mState != kWrite) {
50 enable();
51 glStencilFunc(GL_ALWAYS, 0x1, 0x1);
52 // The test always passes so the first two values are meaningless
53 glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
54 glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
55 mState = kWrite;
56 }
57 }
58
enableDebugTest(GLint value,bool greater)59 void Stencil::enableDebugTest(GLint value, bool greater) {
60 enable();
61 glStencilFunc(greater ? GL_LESS : GL_EQUAL, value, 0xffffffff);
62 // We only want to test, let's keep everything
63 glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
64 mState = kTest;
65 }
66
enableDebugWrite()67 void Stencil::enableDebugWrite() {
68 if (mState != kWrite) {
69 enable();
70 glStencilFunc(GL_ALWAYS, 0x1, 0xffffffff);
71 // The test always passes so the first two values are meaningless
72 glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
73 glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
74 mState = kWrite;
75 }
76 }
77
enable()78 void Stencil::enable() {
79 if (mState == kDisabled) {
80 glEnable(GL_STENCIL_TEST);
81 }
82 }
83
disable()84 void Stencil::disable() {
85 if (mState != kDisabled) {
86 glDisable(GL_STENCIL_TEST);
87 mState = kDisabled;
88 }
89 }
90
91 }; // namespace uirenderer
92 }; // namespace android
93