188 lines
7.5 KiB
Java
188 lines
7.5 KiB
Java
/*
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* Copyright (c) 2002-2011 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.opengles;
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import org.lwjgl.BufferUtils;
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import org.lwjgl.LWJGLUtil;
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import org.lwjgl.opengl.OpenGLException;
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import java.nio.Buffer;
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import static org.lwjgl.opengles.GLES20.*;
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/**
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* A class to check buffer boundaries in GL methods. Many GL
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* methods read data from the GL into a native Buffer at its current position. If there is unsufficient space in the buffer when
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* the call is made then a buffer overflow would otherwise occur and cause unexpected behaviour, a crash, or worse, a security
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* risk. Therefore in those methods where GL reads data back into a buffer, we will call a bounds check method from this class
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* to ensure that there is sufficient space in the buffer.
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* <p/>
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* Thrown by the debug build library of the LWJGL if any OpenGL operation causes an error.
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*
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* @author cix_foo <cix_foo@users.sourceforge.net>
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* @version $Revision: 3459 $
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* $Id: GLChecks.java 3459 2010-11-29 17:21:05Z spasi $
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*/
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class GLChecks {
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/** Static methods only! */
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private GLChecks() {
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}
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static int getBufferObjectSize(int buffer_enum) {
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return glGetBufferParameter(buffer_enum, GLES20.GL_BUFFER_SIZE);
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}
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/** Helper method to ensure that array buffer objects are disabled. If they are enabled, we'll throw an OpenGLException */
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static void ensureArrayVBOdisabled() {
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if ( LWJGLUtil.CHECKS && StateTracker.getTracker().arrayBuffer != 0 )
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throw new OpenGLException("Cannot use Buffers when Array Buffer Object is enabled");
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}
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/** Helper method to ensure that array buffer objects are enabled. If they are disabled, we'll throw an OpenGLException */
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static void ensureArrayVBOenabled() {
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if ( LWJGLUtil.CHECKS && StateTracker.getTracker().arrayBuffer == 0 )
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throw new OpenGLException("Cannot use offsets when Array Buffer Object is disabled");
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}
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/** Helper method to ensure that element array buffer objects are disabled. If they are enabled, we'll throw an OpenGLException */
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static void ensureElementVBOdisabled() {
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if ( LWJGLUtil.CHECKS && StateTracker.getTracker().elementArrayBuffer != 0 )
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throw new OpenGLException("Cannot use Buffers when Element Array Buffer Object is enabled");
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}
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/** Helper method to ensure that element array buffer objects are enabled. If they are disabled, we'll throw an OpenGLException */
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static void ensureElementVBOenabled() {
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if ( LWJGLUtil.CHECKS && StateTracker.getTracker().elementArrayBuffer == 0 )
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throw new OpenGLException("Cannot use offsets when Element Array Buffer Object is disabled");
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}
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/**
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* Calculate the storage required for an image in elements
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*
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* @param format The format of the image (example: GL_RGBA)
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* @param type The type of the image elements (example: GL_UNSIGNED_BYTE)
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* @param width The width of the image
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* @param height The height of the image (1 for 1D images)
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* @param depth The depth of the image (1 for 2D images)
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*
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* @return the size, in elements, of the image
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*/
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static int calculateImageStorage(Buffer buffer, int format, int type, int width, int height, int depth) {
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return LWJGLUtil.CHECKS ? calculateImageStorage(format, type, width, height, depth) >> BufferUtils.getElementSizeExponent(buffer) : 0;
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}
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static int calculateTexImage1DStorage(Buffer buffer, int format, int type, int width) {
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return LWJGLUtil.CHECKS ? calculateTexImage1DStorage(format, type, width) >> BufferUtils.getElementSizeExponent(buffer) : 0;
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}
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static int calculateTexImage2DStorage(Buffer buffer, int format, int type, int width, int height) {
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return LWJGLUtil.CHECKS ? calculateTexImage2DStorage(format, type, width, height) >> BufferUtils.getElementSizeExponent(buffer) : 0;
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}
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static int calculateTexImage3DStorage(Buffer buffer, int format, int type, int width, int height, int depth) {
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return LWJGLUtil.CHECKS ? calculateTexImage3DStorage(format, type, width, height, depth) >> BufferUtils.getElementSizeExponent(buffer) : 0;
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}
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/**
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* Calculate the storage required for an image in bytes.
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*
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* @param format The format of the image (example: GL_RGBA)
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* @param type The type of the image elements (example: GL_UNSIGNED_BYTE)
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* @param width The width of the image
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* @param height The height of the image (1 for 1D images)
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* @param depth The depth of the image (1 for 2D images)
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*
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* @return the size, in bytes, of the image
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*/
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private static int calculateImageStorage(int format, int type, int width, int height, int depth) {
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return calculateBytesPerPixel(format, type) * width * height * depth;
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}
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private static int calculateTexImage1DStorage(int format, int type, int width) {
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return calculateBytesPerPixel(format, type) * width;
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}
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private static int calculateTexImage2DStorage(int format, int type, int width, int height) {
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return calculateTexImage1DStorage(format, type, width) * height;
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}
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private static int calculateTexImage3DStorage(int format, int type, int width, int height, int depth) {
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return calculateTexImage2DStorage(format, type, width, height) * depth;
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}
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private static int calculateBytesPerPixel(int format, int type) {
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int bpe;
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switch ( type ) {
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case GL_UNSIGNED_BYTE:
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case GL_BYTE:
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bpe = 1;
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break;
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case GL_UNSIGNED_SHORT:
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case GL_SHORT:
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bpe = 2;
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break;
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case GL_UNSIGNED_INT:
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case GL_INT:
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case GL_FLOAT:
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bpe = 4;
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break;
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default:
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// TODO: Add more types (like the GL12 types GL_UNSIGNED_INT_8_8_8_8
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return 0;
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// throw new IllegalArgumentException("Unknown type " + type);
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}
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int epp;
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switch ( format ) {
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case GL_LUMINANCE:
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case GL_ALPHA:
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epp = 1;
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break;
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case GL_LUMINANCE_ALPHA:
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epp = 2;
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break;
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case GL_RGB:
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epp = 3;
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break;
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case GL_RGBA:
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epp = 4;
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break;
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default:
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// TODO: Add more formats. Assuming 4 is too wasteful on buffer sizes where e.g. 1 is enough (like GL_DEPTH_COMPONENT)
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return 0;
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}
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return bpe * epp;
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}
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} |