/** Begin building a mesh */
public void begin(final VertexAttributes attributes, int primitiveType) {
if (this.attributes != null) throw new RuntimeException("Call end() first");
this.attributes = attributes;
this.vertices.clear();
this.indices.clear();
this.parts.clear();
this.vindex = 0;
this.istart = 0;
this.part = null;
this.stride = attributes.vertexSize / 4;
this.vertex = new float[stride];
VertexAttribute a = attributes.findByUsage(Usage.Position);
if (a == null) throw new GdxRuntimeException("Cannot build mesh without position attribute");
posOffset = a.offset / 4;
posSize = a.numComponents;
a = attributes.findByUsage(Usage.Normal);
norOffset = a == null ? -1 : a.offset / 4;
a = attributes.findByUsage(Usage.Color);
colOffset = a == null ? -1 : a.offset / 4;
colSize = a == null ? 0 : a.numComponents;
a = attributes.findByUsage(Usage.ColorPacked);
cpOffset = a == null ? -1 : a.offset / 4;
a = attributes.findByUsage(Usage.TextureCoordinates);
uvOffset = a == null ? -1 : a.offset / 4;
setColor(null);
this.primitiveType = primitiveType;
}
@Override
public boolean equals(final Object obj) {
if (!(obj instanceof VertexAttributes)) return false;
VertexAttributes other = (VertexAttributes) obj;
if (this.attributes.length != other.size()) return false;
for (int i = 0; i < attributes.length; i++) {
if (!attributes[i].equals(other.attributes[i])) return false;
}
return true;
}
@Override
public void unbind(final ShaderProgram shader, final 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);
}
}
}
gl.glBindBuffer(GL20.GL_ARRAY_BUFFER, 0);
isBound = false;
}
@Override
public void bind(ShaderProgram shader, int[] locations) {
final GL20 gl = Gdx.gl20;
gl.glBindBuffer(GL20.GL_ARRAY_BUFFER, bufferHandle);
if (isDirty) {
gl.glBufferData(GL20.GL_ARRAY_BUFFER, buffer.limit(), buffer, usage);
isDirty = false;
}
final int numAttributes = attributes.size();
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);
if (attribute.usage == Usage.ColorPacked)
shader.setVertexAttribute(
location,
attribute.numComponents,
GL20.GL_UNSIGNED_BYTE,
true,
attributes.vertexSize,
attribute.offset);
else
shader.setVertexAttribute(
location,
attribute.numComponents,
GL20.GL_FLOAT,
false,
attributes.vertexSize,
attribute.offset);
}
} 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);
if (attribute.usage == Usage.ColorPacked)
shader.setVertexAttribute(
location,
attribute.numComponents,
GL20.GL_UNSIGNED_BYTE,
true,
attributes.vertexSize,
attribute.offset);
else
shader.setVertexAttribute(
location,
attribute.numComponents,
GL20.GL_FLOAT,
false,
attributes.vertexSize,
attribute.offset);
}
}
isBound = true;
}