188 lines
4.6 KiB
Java
188 lines
4.6 KiB
Java
/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.examples.spaceinvaders;
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import static org.lwjgl.opengl.GL11.*;
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/**
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* A texture to be bound within OpenGL. This object is responsible for
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* keeping track of a given OpenGL texture and for calculating the
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* texturing mapping coordinates of the full image.
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*
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* Since textures need to be powers of 2 the actual texture may be
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* considerably bigged that the source image and hence the texture
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* mapping coordinates need to be adjusted to matchup drawing the
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* sprite against the texture.
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*
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* @author Kevin Glass
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* @author Brian Matzon
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*/
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public class Texture {
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/** The GL target type */
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private int target;
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/** The GL texture ID */
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private int textureID;
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/** The height of the image */
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private int height;
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/** The width of the image */
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private int width;
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/** The width of the texture */
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private int texWidth;
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/** The height of the texture */
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private int texHeight;
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/** The ratio of the width of the image to the texture */
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private float widthRatio;
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/** The ratio of the height of the image to the texture */
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private float heightRatio;
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/**
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* Create a new texture
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*
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* @param target The GL target
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* @param textureID The GL texture ID
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*/
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public Texture(int target, int textureID) {
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this.target = target;
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this.textureID = textureID;
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}
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/**
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* Bind the specified GL context to a texture
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*/
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public void bind() {
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glBindTexture(target, textureID);
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}
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/**
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* Set the height of the image
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*
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* @param height The height of the image
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*/
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public void setHeight(int height) {
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this.height = height;
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setHeight();
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}
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/**
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* Set the width of the image
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*
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* @param width The width of the image
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*/
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public void setWidth(int width) {
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this.width = width;
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setWidth();
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}
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/**
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* Get the height of the original image
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*
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* @return The height of the original image
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*/
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public int getImageHeight() {
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return height;
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}
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/**
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* Get the width of the original image
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*
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* @return The width of the original image
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*/
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public int getImageWidth() {
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return width;
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}
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/**
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* Get the height of the physical texture
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*
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* @return The height of physical texture
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*/
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public float getHeight() {
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return heightRatio;
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}
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/**
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* Get the width of the physical texture
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*
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* @return The width of physical texture
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*/
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public float getWidth() {
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return widthRatio;
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}
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/**
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* Set the height of this texture
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*
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* @param texHeight The height of the texture
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*/
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public void setTextureHeight(int texHeight) {
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this.texHeight = texHeight;
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setHeight();
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}
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/**
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* Set the width of this texture
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*
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* @param texWidth The width of the texture
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*/
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public void setTextureWidth(int texWidth) {
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this.texWidth = texWidth;
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setWidth();
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}
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/**
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* Set the height of the texture. This will update the
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* ratio also.
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*/
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private void setHeight() {
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if (texHeight != 0) {
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heightRatio = ((float) height) / texHeight;
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}
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}
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/**
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* Set the width of the texture. This will update the
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* ratio also.
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*/
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private void setWidth() {
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if (texWidth != 0) {
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widthRatio = ((float) width) / texWidth;
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}
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}
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} |