mirror of https://github.com/axmolengine/axmol.git
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#ifndef GrGLIRect_DEFINED
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#define GrGLIRect_DEFINED
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#include "GrGLInterface.h"
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/**
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* Helper struct for dealing with the fact that Ganesh and GL use different
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* window coordinate systems (top-down vs bottom-up)
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*/
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struct GrGLIRect {
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GrGLint fLeft;
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GrGLint fBottom;
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GrGLsizei fWidth;
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GrGLsizei fHeight;
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void pushToGLViewport() const {
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GR_GL(Viewport(fLeft, fBottom, fWidth, fHeight));
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}
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void pushToGLScissor() const {
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GR_GL(Scissor(fLeft, fBottom, fWidth, fHeight));
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}
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void setFromGLViewport() {
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GR_STATIC_ASSERT(sizeof(GrGLIRect) == 4*sizeof(GrGLint));
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GR_GL_GetIntegerv(GR_GL_VIEWPORT, (GrGLint*) this);
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}
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// sometimes we have a GrIRect from the client that we
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// want to simultaneously make relative to GL's viewport
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// and convert from top-down to bottom-up.
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void setRelativeTo(const GrGLIRect& glRect,
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int leftOffset,
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int topOffset,
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int width,
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int height) {
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fLeft = glRect.fLeft + leftOffset;
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fWidth = width;
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fBottom = glRect.fBottom + (glRect.fHeight - topOffset - height);
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fHeight = height;
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GrAssert(fLeft >= 0);
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GrAssert(fWidth >= 0);
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GrAssert(fBottom >= 0);
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GrAssert(fHeight >= 0);
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}
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bool contains(const GrGLIRect& glRect) const {
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return fLeft <= glRect.fLeft &&
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fBottom <= glRect.fBottom &&
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fLeft + fWidth >= glRect.fLeft + glRect.fWidth &&
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fBottom + fHeight >= glRect.fBottom + glRect.fHeight;
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}
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void invalidate() {fLeft = fWidth = fBottom = fHeight = -1;}
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bool operator ==(const GrGLIRect& glRect) const {
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return 0 == memcmp(this, &glRect, sizeof(GrGLIRect));
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}
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bool operator !=(const GrGLIRect& glRect) const {return !(*this == glRect);}
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};
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#endif
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