Scissor.cpp revision 96a5c4c7bab6718524de7253da8309143ab48bef
165fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik/* 265fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * Copyright (C) 2015 The Android Open Source Project 365fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * 465fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * Licensed under the Apache License, Version 2.0 (the "License"); 565fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * you may not use this file except in compliance with the License. 665fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * You may obtain a copy of the License at 765fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * 865fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * http://www.apache.org/licenses/LICENSE-2.0 965fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * 1065fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * Unless required by applicable law or agreed to in writing, software 1165fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * distributed under the License is distributed on an "AS IS" BASIS, 1265fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1365fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * See the License for the specific language governing permissions and 1465fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik * limitations under the License. 1565fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik */ 1696a5c4c7bab6718524de7253da8309143ab48befChris Craik#include "renderstate/Scissor.h" 1765fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 1865fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craiknamespace android { 1965fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craiknamespace uirenderer { 2065fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 2165fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris CraikScissor::Scissor() 2265fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik : mEnabled(false) 2365fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik , mScissorX(0) 2465fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik , mScissorY(0) 2565fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik , mScissorWidth(0) 2665fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik , mScissorHeight(0) { 2765fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik} 2865fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 2965fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craikbool Scissor::setEnabled(bool enabled) { 3065fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik if (mEnabled != enabled) { 3165fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik if (enabled) { 3265fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik glEnable(GL_SCISSOR_TEST); 3365fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik } else { 3465fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik glDisable(GL_SCISSOR_TEST); 3565fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik } 3665fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik mEnabled = enabled; 3765fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik return true; 3865fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik } 3965fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik return false; 4065fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik} 4165fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 4265fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craikbool Scissor::set(GLint x, GLint y, GLint width, GLint height) { 4365fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik if (mEnabled && (x != mScissorX || y != mScissorY 4465fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik || width != mScissorWidth || height != mScissorHeight)) { 4565fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 4665fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik if (x < 0) { 4765fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik width += x; 4865fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik x = 0; 4965fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik } 5065fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik if (y < 0) { 5165fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik height += y; 5265fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik y = 0; 5365fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik } 5465fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik if (width < 0) { 5565fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik width = 0; 5665fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik } 5765fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik if (height < 0) { 5865fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik height = 0; 5965fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik } 6065fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik glScissor(x, y, width, height); 6165fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 6265fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik mScissorX = x; 6365fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik mScissorY = y; 6465fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik mScissorWidth = width; 6565fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik mScissorHeight = height; 6665fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 6765fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik return true; 6865fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik } 6965fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik return false; 7065fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik} 7165fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 7265fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craikvoid Scissor::reset() { 7365fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik mScissorX = mScissorY = mScissorWidth = mScissorHeight = 0; 7465fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik} 7565fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 7665fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craikvoid Scissor::invalidate() { 7765fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik mEnabled = glIsEnabled(GL_SCISSOR_TEST); 7865fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik setEnabled(true); 7965fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik reset(); 8065fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik} 8165fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 8265fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik} /* namespace uirenderer */ 8365fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik} /* namespace android */ 8465fe5eeb19e2e15c8b1ee91e8a2dcf0c25e48ca6Chris Craik 85