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/*
* 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 */
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