/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* 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.
******************************************************************************/
package com.badlogic.gdx.graphics.glutils;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.GL11;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.VertexAttribute;
import com.badlogic.gdx.graphics.VertexAttributes;
import com.badlogic.gdx.graphics.VertexAttributes.Usage;
import com.badlogic.gdx.utils.BufferUtils;
/** <p>
* Convenience class for working with OpenGL vertex arrays. It interleaves all data in the order you specified in the constructor
* via {@link VertexAttribute}.
* </p>
*
* <p>
* This class does not support shaders and for that matter OpenGL ES 2.0. For this {@link VertexBufferObject}s are needed.
* </p>
*
* @author mzechner, Dave Clayton <contact@redskyforge.com> */
public class VertexArray implements VertexData {
final VertexAttributes attributes;
final FloatBuffer buffer;
final ByteBuffer byteBuffer;
boolean isBound = false;
/** Constructs a new interleaved VertexArray
*
* @param numVertices the maximum number of vertices
* @param attributes the {@link VertexAttribute}s */
public VertexArray (int numVertices, VertexAttribute... attributes) {
this(numVertices, new VertexAttributes(attributes));
}
/** Constructs a new interleaved VertexArray
*
* @param numVertices the maximum number of vertices
* @param attributes the {@link VertexAttributes} */
public VertexArray (int numVertices, VertexAttributes attributes) {
this.attributes = attributes;
byteBuffer = BufferUtils.newUnsafeByteBuffer(this.attributes.vertexSize * numVertices);
buffer = byteBuffer.asFloatBuffer();
buffer.flip();
byteBuffer.flip();
}
/** {@inheritDoc} */
@Override
public void dispose () {
BufferUtils.disposeUnsafeByteBuffer(byteBuffer);
}
/** {@inheritDoc} */
@Override
public FloatBuffer getBuffer () {
return buffer;
}
/** {@inheritDoc} */
@Override
public int getNumVertices () {
return buffer.limit() * 4 / attributes.vertexSize;
}
/** {@inheritDoc} */
public int getNumMaxVertices () {
return byteBuffer.capacity() / attributes.vertexSize;
}
/** {@inheritDoc} */
@Override
public void setVertices (float[] vertices, int offset, int count) {
BufferUtils.copy(vertices, byteBuffer, count, offset);
buffer.position(0);
buffer.limit(count);
}
@Override
public void bind () {
GL10 gl = Gdx.gl10;
int textureUnit = 0;
int numAttributes = attributes.size();
byteBuffer.limit(buffer.limit() * 4);
for (int i = 0; i < numAttributes; i++) {
VertexAttribute attribute = attributes.get(i);
switch (attribute.usage) {
case Usage.Position:
byteBuffer.position(attribute.offset);
gl.glEnableClientState(GL11.GL_VERTEX_ARRAY);
gl.glVertexPointer(attribute.numComponents, GL10.GL_FLOAT, attributes.vertexSize, byteBuffer);
break;
case Usage.Color:
case Usage.ColorPacked:
int colorType = GL10.GL_FLOAT;
if (attribute.usage == Usage.ColorPacked) colorType = GL11.GL_UNSIGNED_BYTE;
byteBuffer.position(attribute.offset);
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
gl.glColorPointer(attribute.numComponents, colorType, attributes.vertexSize, byteBuffer);
break;
case Usage.Normal:
byteBuffer.position(attribute.offset);
gl.glEnableClientState(GL10.GL_NORMAL_ARRAY);
gl.glNormalPointer(GL10.GL_FLOAT, attributes.vertexSize, byteBuffer);
break;
case Usage.TextureCoordinates:
gl.glClientActiveTexture(GL10.GL_TEXTURE0 + textureUnit);
gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
byteBuffer.position(attribute.offset);
gl.glTexCoordPointer(attribute.numComponents, GL10.GL_FLOAT, attributes.vertexSize, byteBuffer);
textureUnit++;
break;
default:
// throw new GdxRuntimeException("unkown vertex attribute type: " + attribute.usage);
}
}
isBound = true;
}
@Override
public void unbind () {
GL10 gl = Gdx.gl10;
int textureUnit = 0;
int numAttributes = attributes.size();
for (int i = 0; i < numAttributes; i++) {
VertexAttribute attribute = attributes.get(i);
switch (attribute.usage) {
case Usage.Position:
break; // no-op, we always need a position bound in gles
case Usage.Color:
case Usage.ColorPacked:
gl.glDisableClientState(GL11.GL_COLOR_ARRAY);
break;
case Usage.Normal:
gl.glDisableClientState(GL11.GL_NORMAL_ARRAY);
break;
case Usage.TextureCoordinates:
gl.glClientActiveTexture(GL11.GL_TEXTURE0 + textureUnit);
gl.glDisableClientState(GL11.GL_TEXTURE_COORD_ARRAY);
textureUnit++;
break;
default:
// throw new GdxRuntimeException("unkown vertex attribute type: " + attribute.usage);
}
}
byteBuffer.position(0);
isBound = false;
}
@Override
public void bind (final ShaderProgram shader) {
bind(shader, null);
}
@Override
public void bind (final ShaderProgram shader, final int[] locations) {
final GL20 gl = Gdx.gl20;
final int numAttributes = attributes.size();
byteBuffer.limit(buffer.limit() * 4);
if (locations == null) {
for (int i = 0; i < numAttributes; i++) {
final VertexAttribute attribute = attributes.get(i);
final int location = shader.getAttributeLocation(attribute.alias);
if (location < 0)
continue;
shader.enableVertexAttribute(location);
byteBuffer.position(attribute.offset);
if (attribute.usage == Usage.ColorPacked)
shader.setVertexAttribute(location, attribute.numComponents, GL20.GL_UNSIGNED_BYTE, true,
attributes.vertexSize, byteBuffer);
else
shader.setVertexAttribute(location, attribute.numComponents, GL20.GL_FLOAT, false,
attributes.vertexSize, byteBuffer);
}
} else {
for (int i = 0; i < numAttributes; i++) {
final VertexAttribute attribute = attributes.get(i);
final int location = locations[i];
if (location < 0)
continue;
shader.enableVertexAttribute(location);
byteBuffer.position(attribute.offset);
if (attribute.usage == Usage.ColorPacked)
shader.setVertexAttribute(location, attribute.numComponents, GL20.GL_UNSIGNED_BYTE, true,
attributes.vertexSize, byteBuffer);
else
shader.setVertexAttribute(location, attribute.numComponents, GL20.GL_FLOAT, false,
attributes.vertexSize, byteBuffer);
}
}
isBound = true;
}
/** Unbinds this VertexBufferObject.
*
* @param shader the shader */
@Override
public void unbind (ShaderProgram shader) {
unbind(shader, null);
}
@Override
public void unbind (ShaderProgram shader, int[] locations) {
final GL20 gl = Gdx.gl20;
final int numAttributes = attributes.size();
if (locations == null) {
for (int i = 0; i < numAttributes; i++) {
shader.disableVertexAttribute(attributes.get(i).alias);
}
} else {
for (int i = 0; i < numAttributes; i++) {
final int location = locations[i];
if (location >= 0)
shader.disableVertexAttribute(location);
}
}
isBound = false;
}
@Override
public VertexAttributes getAttributes () {
return attributes;
}
}