1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
|
/*
* Copyright (C) 2015 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 "renderstate/Scissor.h"
#include "Rect.h"
#include <utils/Log.h>
namespace android {
namespace uirenderer {
Scissor::Scissor()
: mEnabled(false), mScissorX(0), mScissorY(0), mScissorWidth(0), mScissorHeight(0) {}
bool Scissor::setEnabled(bool enabled) {
if (mEnabled != enabled) {
if (enabled) {
glEnable(GL_SCISSOR_TEST);
} else {
glDisable(GL_SCISSOR_TEST);
}
mEnabled = enabled;
return true;
}
return false;
}
bool Scissor::set(GLint x, GLint y, GLint width, GLint height) {
if (mEnabled &&
(x != mScissorX || y != mScissorY || width != mScissorWidth || height != mScissorHeight)) {
if (x < 0) {
width += x;
x = 0;
}
if (y < 0) {
height += y;
y = 0;
}
if (width < 0) {
width = 0;
}
if (height < 0) {
height = 0;
}
glScissor(x, y, width, height);
mScissorX = x;
mScissorY = y;
mScissorWidth = width;
mScissorHeight = height;
return true;
}
return false;
}
void Scissor::set(int viewportHeight, const Rect& clip) {
// transform to Y-flipped GL space, and prevent negatives
GLint x = std::max(0, (int)clip.left);
GLint y = std::max(0, viewportHeight - (int)clip.bottom);
GLint width = std::max(0, ((int)clip.right) - x);
GLint height = std::max(0, (viewportHeight - (int)clip.top) - y);
if (x != mScissorX || y != mScissorY || width != mScissorWidth || height != mScissorHeight) {
glScissor(x, y, width, height);
mScissorX = x;
mScissorY = y;
mScissorWidth = width;
mScissorHeight = height;
}
}
void Scissor::reset() {
mScissorX = mScissorY = mScissorWidth = mScissorHeight = 0;
}
void Scissor::invalidate() {
mEnabled = glIsEnabled(GL_SCISSOR_TEST);
setEnabled(true);
reset();
}
void Scissor::dump() {
ALOGD("Scissor: enabled %d, %d %d %d %d", mEnabled, mScissorX, mScissorY, mScissorWidth,
mScissorHeight);
}
} /* namespace uirenderer */
} /* namespace android */
|
