/// <summary>
/// Update the face geometric data in the buffer.
/// This method is called when FaceRenderManager's OnDrawFrame method calling.
/// </summary>
/// <param name="camera">ARCamera</param>
/// <param name="face">ARFace</param>
public void OnDrawFrame(ARCamera camera, ARFace face)
{
ARFaceGeometry faceGeometry = face.FaceGeometry;
UpdateFaceGeometryData(faceGeometry);
UpdateModelViewProjectionData(camera, face);
DrawFaceGeometry();
faceGeometry.Release();
}
private void UpdateFaceGeometryData(ARFaceGeometry faceGeometry)
{
ShaderUtil.CheckGlError(TAG, "Before update data.");
FloatBuffer faceVertices = faceGeometry.Vertices;
// Obtain the number of geometric vertices of a face.
mPointsNum = faceVertices.Limit() / 3;
FloatBuffer textureCoordinates = faceGeometry.TextureCoordinates;
// Obtain the number of geometric texture coordinates of the
// face (the texture coordinates are two-dimensional).
int texNum = textureCoordinates.Limit() / 2;
Log.Debug(TAG, "Update face geometry data: texture coordinates size:" + texNum);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, mVerticeId);
if (mVerticeBufferSize < (mPointsNum + texNum) * BYTES_PER_POINT)
{
while (mVerticeBufferSize < (mPointsNum + texNum) * BYTES_PER_POINT)
{
// If the capacity of the vertex VBO buffer is insufficient, expand the capacity.
mVerticeBufferSize *= 2;
}
GLES20.GlBufferData(GLES20.GlArrayBuffer, mVerticeBufferSize, null, GLES20.GlDynamicDraw);
}
GLES20.GlBufferSubData(GLES20.GlArrayBuffer, 0, mPointsNum * BYTES_PER_POINT, faceVertices);
GLES20.GlBufferSubData(GLES20.GlArrayBuffer, mPointsNum * BYTES_PER_POINT, texNum * BYTES_PER_COORD,
textureCoordinates);
GLES20.GlBindBuffer(GLES20.GlArrayBuffer, 0);
mTrianglesNum = faceGeometry.TriangleCount;
IntBuffer faceTriangleIndices = faceGeometry.TriangleIndices;
Log.Debug(TAG, "update face geometry data: faceTriangleIndices.size: " + faceTriangleIndices.Limit());
GLES20.GlBindBuffer(GLES20.GlElementArrayBuffer, mTriangleId);
if (mTriangleBufferSize < mTrianglesNum * BYTES_PER_POINT)
{
while (mTriangleBufferSize < mTrianglesNum * BYTES_PER_POINT)
{
// If the capacity of the vertex VBO buffer is insufficient, expand the capacity.
mTriangleBufferSize *= 2;
}
GLES20.GlBufferData(GLES20.GlElementArrayBuffer, mTriangleBufferSize, null, GLES20.GlDynamicDraw);
}
GLES20.GlBufferSubData(GLES20.GlElementArrayBuffer, 0, mTrianglesNum * BYTES_PER_POINT, faceTriangleIndices);
GLES20.GlBindBuffer(GLES20.GlElementArrayBuffer, 0);
ShaderUtil.CheckGlError(TAG, "After update data.");
}
public void Update(ARFaceGeometry newGeometry)
{
((ARSCNFaceGeometry)Geometry).Update(newGeometry);
}
