/// <summary>
/// 遍历以<paramref name="lastVertexId"/>为最后一个顶点的图元，
/// 瞄准每个图元的索引（例如1个三角形有3个索引）中的最后一个索引，
/// 将此索引在<see cref="IndexBuffer"/>中的索引（位置）收集起来。
/// </summary>
/// <param name="arg"></param>
/// <param name="lastVertexId"></param>
/// <returns></returns>
private List <RecognizedPrimitiveInfo> GetLastIndexIdList(RenderEventArgs arg, uint lastVertexId)
{
PrimitiveRecognizer recognizer = PrimitiveRecognizerFactory.Create(
(arg.PickingGeometryType == PickingGeometryType.Point &&
this.indexBuffer.Mode.ToGeometryType() == PickingGeometryType.Line) ?
DrawMode.Points : this.indexBuffer.Mode);
PrimitiveRestartState glState = GetPrimitiveRestartState();
var buffer = this.indexBuffer as OneIndexBuffer;
IntPtr pointer = buffer.MapBuffer(MapBufferAccess.ReadOnly);
List <RecognizedPrimitiveInfo> primitiveInfoList = null;
if (glState == null)
{
primitiveInfoList = recognizer.Recognize(lastVertexId, pointer, this.indexBuffer as OneIndexBuffer);
}
else
{
primitiveInfoList = recognizer.Recognize(lastVertexId, pointer, this.indexBuffer as OneIndexBuffer, glState.RestartIndex);
}
buffer.UnmapBuffer();
return(primitiveInfoList);
}
/// <summary>
/// 遍历以<paramref name="lastVertexId"/>为最后一个顶点的图元，
/// 瞄准每个图元的索引（例如1个三角形有3个索引）中的最后一个索引，
/// 将此索引在<see cref="IndexBuffer"/>中的索引（位置）收集起来。
/// </summary>
/// <param name="arg"></param>
/// <param name="lastVertexId"></param>
/// <returns></returns>
private List <RecognizedPrimitiveInfo> GetLastIndexIdList(PickingEventArgs arg, uint lastVertexId)
{
var indexBuffer = this.Renderer.PickingRenderUnit.VertexArrayObject.IndexBuffer;
PrimitiveRecognizer recognizer = PrimitiveRecognizerFactory.Create(
(arg.GeometryType.Contains(GeometryType.Point) &&
indexBuffer.Mode.ToGeometryType() == GeometryType.Line) ?
DrawMode.Points : indexBuffer.Mode);
PrimitiveRestartState glState = GetPrimitiveRestartState();
var buffer = indexBuffer as OneIndexBuffer;
IntPtr pointer = buffer.MapBuffer(MapBufferAccess.ReadOnly);
List <RecognizedPrimitiveInfo> primitiveInfoList = null;
if (glState == null)
{
primitiveInfoList = recognizer.Recognize(lastVertexId, pointer, indexBuffer as OneIndexBuffer);
}
else
{
primitiveInfoList = recognizer.Recognize(lastVertexId, pointer, indexBuffer as OneIndexBuffer, glState.RestartIndex);
}
buffer.UnmapBuffer();
return(primitiveInfoList);
}
/// <summary>
/// 遍历以<paramref name="lastVertexId"/>为最后一个顶点的图元，
/// 瞄准每个图元的索引（例如1个三角形有3个索引）中的最后一个索引，
/// 将此索引在<see cref="IndexBuffer"/>中的索引（位置）收集起来。
/// </summary>
/// <param name="arg"></param>
/// <param name="lastVertexId"></param>
/// <returns></returns>
private List <RecognizedPrimitiveInfo> GetLastIndexIdList(PickingEventArgs arg, uint lastVertexId)
{
var drawCmd = this.DrawCommand;
PrimitiveRecognizer recognizer = PrimitiveRecognizerFactory.Create(
(arg.GeometryType.Contains(GeometryType.Point) &&
drawCmd.Mode.ToGeometryType() == GeometryType.Line) ?
DrawMode.Points : drawCmd.Mode);
PrimitiveRestartState glState = GetPrimitiveRestartState();
var buffer = (drawCmd as IHasIndexBuffer).IndexBufferObject;
IntPtr pointer = buffer.MapBuffer(MapBufferAccess.ReadOnly);
List <RecognizedPrimitiveInfo> primitiveInfoList = null;
if (glState == null)
{
primitiveInfoList = recognizer.Recognize(lastVertexId, pointer, drawCmd as DrawElementsCmd);
}
else
{
primitiveInfoList = recognizer.Recognize(lastVertexId, pointer, drawCmd as DrawElementsCmd, glState.RestartIndex);
}
buffer.UnmapBuffer();
return(primitiveInfoList);
}
private PrimitiveRestartState GetPrimitiveRestartState(OneIndexBuffer indexBuffer)
{
PrimitiveRestartState result = null;
switch (indexBuffer.ElementType)
{
case IndexBufferElementType.UByte:
if (this.ubyteRestartIndexState == null)
{ this.ubyteRestartIndexState = new PrimitiveRestartState(indexBuffer.ElementType); }
result = this.ubyteRestartIndexState;
break;
case IndexBufferElementType.UShort:
if (this.ushortRestartIndexState == null)
{ this.ushortRestartIndexState = new PrimitiveRestartState(indexBuffer.ElementType); }
result = this.ushortRestartIndexState;
break;
case IndexBufferElementType.UInt:
if (this.uintRestartIndexState == null)
{ this.uintRestartIndexState = new PrimitiveRestartState(indexBuffer.ElementType); }
result = this.uintRestartIndexState;
break;
default:
throw new NotImplementedException();
}
return result;
}
/// <summary>
///
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public IPickableRenderUnit ToRenderUnit(IBufferSource model)
{
// init shader program.
ShaderProgram pickProgram = this.programProvider.GetShaderProgram();
// init vertex attribute buffer objects.
VertexBuffer positionBuffer = model.GetVertexAttributeBuffer(this.positionNameInIBufferSource);
// RULE: 由于picking.vert/frag只支持vec3的position buffer，所以有此硬性规定。
if (positionBuffer == null || positionBuffer.Config != VBOConfig.Vec3)
{
throw new Exception(string.Format("Position buffer must use a type composed of 3 float as PropertyBuffer<T>'s T!"));
}
// init index buffer.
IndexBuffer indexBuffer = model.GetIndexBuffer();
// init VAO.
var pickingVAO = new VertexArrayObject(indexBuffer, pickProgram, new VertexShaderAttribute(positionBuffer, PickingShaderHelper.in_Position));
var renderUnit = new IPickableRenderUnit(pickProgram, pickingVAO, positionBuffer, this.states);
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care this rule when designing a model's index buffer.
var ptr = indexBuffer as OneIndexBuffer;
if (ptr != null)
{
GLState glState = new PrimitiveRestartState(ptr.ElementType);
renderUnit.StateList.Add(glState);
}
return(renderUnit);
}
/// <summary>
///
/// </summary>
protected override void DoInitialize()
{
// init shader program.
ShaderProgram program = this.shaderCodes.CreateProgram();
// init property buffer objects.
VertexBuffer positionBuffer = null;
IBufferable model = this.DataSource;
VertexBuffer[] vertexAttributeBuffers;
{
var list = new List <VertexBuffer>();
foreach (AttributeMap.NamePair item in this.attributeMap)
{
VertexBuffer buffer = model.GetVertexAttributeBuffer(
item.NameInIBufferable, item.VarNameInShader);
if (buffer == null)
{
throw new Exception(string.Format("[{0}] returns null buffer pointer!", model));
}
if (item.NameInIBufferable == positionNameInIBufferable)
{
if (positionBuffer != null)
{
throw new Exception(string.Format("Duplicate position buffer is not allowed!"));
}
positionBuffer = buffer.Clone() as VertexBuffer;
positionBuffer.VarNameInVertexShader = "in_Position";// in_Postion same with in the PickingShader.vert shader
}
list.Add(buffer);
}
vertexAttributeBuffers = list.ToArray();
}
// init index buffer
OneIndexBuffer indexBuffer;
{
var mode = DrawMode.Points;//any mode is OK as we'll update it later in other place.
indexBuffer = Buffer.Create(IndexBufferElementType.UInt, positionBuffer.ByteLength / (positionBuffer.Config.GetDataSize() * positionBuffer.Config.GetDataTypeByteLength()), mode, BufferUsage.StaticDraw);
this.maxElementCount = indexBuffer.ElementCount;
indexBuffer.ElementCount = 0;// 高亮0个图元
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care this rule when designing a model's index buffer.
GLState glState = new PrimitiveRestartState(indexBuffer.ElementType);
this.stateList.Add(glState);
}
// init VAO.
var vertexArrayObject = new VertexArrayObject(indexBuffer, vertexAttributeBuffers);
vertexArrayObject.Initialize(program);
// sets fields.
this.Program = program;
this.vertexAttributeBuffers = vertexAttributeBuffers;
this.indexBuffer = indexBuffer;
this.vertexArrayObject = vertexArrayObject;
this.positionBuffer = positionBuffer;
}
protected override void DoInitialize()
{
// init shader program.
ShaderProgram program = this.shaderCodes.CreateProgram();
VertexBuffer positionBuffer = null;
IBufferable model = this.DataSource;
VertexBuffer[] vertexAttributeBuffers;
{
var list = new List <VertexBuffer>();
foreach (AttributeMap.NamePair item in this.attributeMap)
{
VertexBuffer buffer = model.GetVertexAttributeBuffer(
item.NameInIBufferable, item.VarNameInShader);
if (buffer == null)
{
throw new Exception(string.Format("[{0}] returns null buffer pointer!", model));
}
if (item.NameInIBufferable == this.PositionNameInIBufferable)
{
positionBuffer = buffer.Clone() as VertexBuffer;
positionBuffer.VarNameInVertexShader = "in_Position";// in_Postion same with in the PickingShader.vert shader
break;
}
list.Add(buffer);
}
vertexAttributeBuffers = list.ToArray();
}
// 由于picking.vert/frag只支持vec3的position buffer，所以有此硬性规定。
if (positionBuffer == null || positionBuffer.Config != VBOConfig.Vec3)
{
throw new Exception(string.Format("Position buffer must use a type composed of 3 float as PropertyBuffer<T>'s T!"));
}
// init index buffer.
IndexBuffer indexBuffer = model.GetIndexBuffer();
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care this rule when designing a model's index buffer.
var ptr = indexBuffer as OneIndexBuffer;
if (ptr != null)
{
GLState glState = new PrimitiveRestartState(ptr.ElementType);
this.stateList.Add(glState);
}
// init VAO.
var vertexArrayObject = new VertexArrayObject(indexBuffer, positionBuffer);
vertexArrayObject.Initialize(program);
// sets fields.
this.Program = program;
this.vertexAttributeBuffers = new VertexBuffer[] { positionBuffer };
this.indexBuffer = indexBuffer;
this.vertexArrayObject = vertexArrayObject;
}
private void RenderForPicking(PickingEventArgs arg, ControlMode controlMode, IDrawCommand tmpCmd)
{
if (!this.IsInitialized)
{
this.Initialize();
}
this.polygonModeState.Mode = arg.GeometryType.GetPolygonMode();
ShaderProgram program = this.PickingRenderUnit.Program;
// 绑定shader
program.Bind();
{
mat4 projection = arg.Scene.Camera.GetProjectionMatrix();
mat4 view = arg.Scene.Camera.GetViewMatrix();
mat4 model = this.GetModelMatrix();
program.glUniform("MVP", projection * view * model);
}
this.polygonModeState.On();
this.lineWidthState.On();
this.pointSizeState.On();
PrimitiveRestartState restart = null;
var hasIndexBuffer = tmpCmd as IHasIndexBuffer;
if (hasIndexBuffer != null)
{
restart = this.GetPrimitiveRestartState(hasIndexBuffer.IndexBufferObject.ElementType);
}
if (restart != null)
{
restart.On();
}
{
var pickable = this as IPickable;
uint baseId = pickable.PickingBaseId;
foreach (var vao in this.PickingRenderUnit.VertexArrayObjects)
{
program.glUniform("pickingBaseId", (int)(baseId));
vao.Draw(controlMode, tmpCmd);
baseId += (uint)vao.VertexAttributes[0].Buffer.Length;
}
}
if (restart != null)
{
restart.Off();
}
this.pointSizeState.Off();
this.lineWidthState.Off();
this.polygonModeState.Off();
// 解绑shader
program.Unbind();
}
/// <summary>
///
/// </summary>
protected override void DoInitialize()
{
// init shader program.
ShaderProgram program = this.shaderCodes.CreateProgram();
// init property buffer objects.
VertexBuffer positionBuffer = null;
IBufferable model = this.DataSource;
VertexBuffer[] vertexAttributeBuffers;
{
var list = new List<VertexBuffer>();
foreach (AttributeMap.NamePair item in this.attributeMap)
{
VertexBuffer buffer = model.GetVertexAttributeBuffer(
item.NameInIBufferable, item.VarNameInShader);
if (buffer == null) { throw new Exception(string.Format("[{0}] returns null buffer pointer!", model)); }
if (item.NameInIBufferable == positionNameInIBufferable)
{
if (positionBuffer != null)
{ throw new Exception(string.Format("Duplicate position buffer is not allowed!")); }
positionBuffer = buffer.Clone() as VertexBuffer;
positionBuffer.VarNameInVertexShader = "in_Position";// in_Postion same with in the PickingShader.vert shader
}
list.Add(buffer);
}
vertexAttributeBuffers = list.ToArray();
}
// init index buffer
OneIndexBuffer indexBuffer;
{
var mode = DrawMode.Points;//any mode is OK as we'll update it later in other place.
indexBuffer = Buffer.Create(IndexBufferElementType.UInt, positionBuffer.ByteLength / (positionBuffer.Config.GetDataSize() * positionBuffer.Config.GetDataTypeByteLength()), mode, BufferUsage.StaticDraw);
this.maxElementCount = indexBuffer.ElementCount;
indexBuffer.ElementCount = 0;// 高亮0个图元
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care this rule when designing a model's index buffer.
GLState glState = new PrimitiveRestartState(indexBuffer.ElementType);
this.stateList.Add(glState);
}
// init VAO.
var vertexArrayObject = new VertexArrayObject(indexBuffer, vertexAttributeBuffers);
vertexArrayObject.Initialize(program);
// sets fields.
this.Program = program;
this.vertexAttributeBuffers = vertexAttributeBuffers;
this.indexBuffer = indexBuffer;
this.vertexArrayObject = vertexArrayObject;
this.positionBuffer = positionBuffer;
}
protected override void DoInitialize()
{
// init shader program.
ShaderProgram program = this.shaderCodes.CreateProgram();
VertexBuffer positionBuffer = null;
IBufferable model = this.DataSource;
VertexBuffer[] vertexAttributeBuffers;
{
var list = new List<VertexBuffer>();
foreach (AttributeMap.NamePair item in this.attributeMap)
{
VertexBuffer buffer = model.GetVertexAttributeBuffer(
item.NameInIBufferable, item.VarNameInShader);
if (buffer == null) { throw new Exception(string.Format("[{0}] returns null buffer pointer!", model)); }
if (item.NameInIBufferable == this.PositionNameInIBufferable)
{
positionBuffer = buffer.Clone() as VertexBuffer;
positionBuffer.VarNameInVertexShader = "in_Position";// in_Postion same with in the PickingShader.vert shader
break;
}
list.Add(buffer);
}
vertexAttributeBuffers = list.ToArray();
}
// 由于picking.vert/frag只支持vec3的position buffer，所以有此硬性规定。
if (positionBuffer == null || positionBuffer.Config != VBOConfig.Vec3)
{ throw new Exception(string.Format("Position buffer must use a type composed of 3 float as PropertyBuffer<T>'s T!")); }
// init index buffer.
IndexBuffer indexBuffer = model.GetIndexBuffer();
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care this rule when designing a model's index buffer.
var ptr = indexBuffer as OneIndexBuffer;
if (ptr != null)
{
GLState glState = new PrimitiveRestartState(ptr.ElementType);
this.stateList.Add(glState);
}
// init VAO.
var vertexArrayObject = new VertexArrayObject(indexBuffer, positionBuffer);
vertexArrayObject.Initialize(program);
// sets fields.
this.Program = program;
this.vertexAttributeBuffers = new VertexBuffer[] { positionBuffer };
this.indexBuffer = indexBuffer;
this.vertexArrayObject = vertexArrayObject;
}
/// <summary>
///
/// </summary>
protected override void DoInitialize()
{
// init shader program.
ShaderProgram program = this.shaderCodes.CreateProgram();
// init vertex attribute buffer objects.
IBufferable model = this.DataSource;
VertexBuffer[] vertexAttributeBuffers;
{
var list = new List <VertexBuffer>();
foreach (AttributeMap.NamePair item in this.attributeMap)
{
VertexBuffer buffer = model.GetVertexAttributeBuffer(
item.NameInIBufferable, item.VarNameInShader);
if (buffer == null)
{
throw new Exception(string.Format("[{0}] returns null buffer pointer!", model));
}
list.Add(buffer);
}
vertexAttributeBuffers = list.ToArray();
}
// init index buffer.
IndexBuffer indexBuffer = model.GetIndexBuffer();
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care this rule when designing a model's index buffer.
var ptr = indexBuffer as OneIndexBuffer;
if (ptr != null)
{
GLState glState = new PrimitiveRestartState(ptr.ElementType);
this.stateList.Add(glState);
}
// init VAO.
var vertexArrayObject = new VertexArrayObject(indexBuffer, vertexAttributeBuffers);
vertexArrayObject.Initialize(program);
// sets fields.
this.Program = program;
this.vertexAttributeBuffers = vertexAttributeBuffers;
this.indexBuffer = indexBuffer;
this.vertexArrayObject = vertexArrayObject;
}
private void RenderForPicking(PickingEventArgs arg, IndexBuffer tempIndexBuffer)
{
if (!this.IsInitialized)
{
this.Initialize();
}
this.polygonModeState.Mode = arg.GeometryType.GetPolygonMode();
ShaderProgram program = this.PickingRenderUnit.Program;
// 绑定shader
program.Bind();
program.glUniform("pickingBaseId", (int)(((IPickable)this).PickingBaseId));
{
mat4 projection = arg.Scene.Camera.GetProjectionMatrix();
mat4 view = arg.Scene.Camera.GetViewMatrix();
mat4 model = this.GetModelMatrix();
program.glUniform("MVP", projection * view * model);
}
this.polygonModeState.On();
this.lineWidthState.On();
this.pointSizeState.On();
var oneIndexBuffer = tempIndexBuffer as OneIndexBuffer;
if (oneIndexBuffer != null)
{
PrimitiveRestartState glState = this.GetPrimitiveRestartState(oneIndexBuffer);
glState.On();
this.PickingRenderUnit.VertexArrayObject.Draw(this.ControlMode, tempIndexBuffer);
glState.Off();
}
else
{
this.PickingRenderUnit.VertexArrayObject.Draw(this.ControlMode, tempIndexBuffer);
}
this.pointSizeState.Off();
this.lineWidthState.Off();
this.polygonModeState.Off();
// 解绑shader
program.Unbind();
}
private void NoPrimitiveRestartIndex(List <RecognizedPrimitiveInfo> primitiveInfoList)
{
PrimitiveRestartState glState = GetPrimitiveRestartState();
if (glState != null)
{
foreach (RecognizedPrimitiveInfo info in primitiveInfoList)
{
foreach (uint vertexId in info.VertexIds)
{
if (vertexId == glState.RestartIndex)
{
throw new Exception();
}
}
}
}
}
/// <summary>
///
/// </summary>
protected override void DoInitialize()
{
// init shader program.
ShaderProgram program = this.shaderCodes.CreateProgram();
// init vertex attribute buffer objects.
IBufferable model = this.DataSource;
VertexBuffer[] vertexAttributeBuffers;
{
var list = new List<VertexBuffer>();
foreach (AttributeMap.NamePair item in this.attributeMap)
{
VertexBuffer buffer = model.GetVertexAttributeBuffer(
item.NameInIBufferable, item.VarNameInShader);
if (buffer == null) { throw new Exception(string.Format("[{0}] returns null buffer pointer!", model)); }
list.Add(buffer);
}
vertexAttributeBuffers = list.ToArray();
}
// init index buffer.
IndexBuffer indexBuffer = model.GetIndexBuffer();
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care this rule when designing a model's index buffer.
var ptr = indexBuffer as OneIndexBuffer;
if (ptr != null)
{
GLState glState = new PrimitiveRestartState(ptr.ElementType);
this.stateList.Add(glState);
}
// init VAO.
var vertexArrayObject = new VertexArrayObject(indexBuffer, vertexAttributeBuffers);
vertexArrayObject.Initialize(program);
// sets fields.
this.Program = program;
this.vertexAttributeBuffers = vertexAttributeBuffers;
this.indexBuffer = indexBuffer;
this.vertexArrayObject = vertexArrayObject;
}
/// <summary>
/// render with specified index buffer.
/// </summary>
/// <param name="arg"></param>
/// <param name="temporaryIndexBuffer"></param>
private void Render4Picking(RenderEventArgs arg, IndexBuffer temporaryIndexBuffer)
{
UpdatePolygonMode(arg.PickingGeometryType);
ShaderProgram program = this.Program;
// 绑定shader
program.Bind();
program.glUniform("pickingBaseId", 0);
UniformMat4 uniformmMVP4Picking = this.uniformmMVP4Picking;
{
mat4 projection = arg.Camera.GetProjectionMatrix();
mat4 view = arg.Camera.GetViewMatrix();
mat4 model = this.GetModelMatrix().Value;
uniformmMVP4Picking.Value = projection * view * model;
}
uniformmMVP4Picking.SetUniform(program);
PickingStateesOn();
var oneIndexBuffer = temporaryIndexBuffer as OneIndexBuffer;
if (oneIndexBuffer != null)
{
PrimitiveRestartState glState = this.GetPrimitiveRestartState(oneIndexBuffer);
glState.On();
this.vertexArrayObject.Render(arg, program, temporaryIndexBuffer);
glState.Off();
}
else
{
this.vertexArrayObject.Render(arg, program, temporaryIndexBuffer);
}
PickingStateesOff();
//if (mvpUpdated) { uniformmMVP4Picking.ResetUniform(program); }
// 解绑shader
program.Unbind();
}
/// <summary>
///
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public RenderUnit ToRenderUnit(IBufferSource model)
{
// init shader program.
ShaderProgram program = this.programProvider.GetShaderProgram();
// init vertex attribute buffer objects.
VertexShaderAttribute[] vertexAttributeBuffers;
{
var list = new List <VertexShaderAttribute>();
foreach (AttributeMap.NamePair item in this.map)
{
VertexBuffer buffer = model.GetVertexAttributeBuffer(item.NameInIBufferSource);
if (buffer == null)
{
throw new Exception(string.Format("[{0}] returns null buffer pointer!", model));
}
list.Add(new VertexShaderAttribute(buffer, item.VarNameInShader));
}
vertexAttributeBuffers = list.ToArray();
}
// init index buffer.
IndexBuffer indexBuffer = model.GetIndexBuffer();
// init VAO.
var vertexArrayObject = new VertexArrayObject(indexBuffer, program, vertexAttributeBuffers);
var result = new RenderUnit(program, vertexArrayObject, this.states);
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care of this rule when designing a model's index buffer.
var ptr = indexBuffer as OneIndexBuffer;
if (ptr != null)
{
GLState glState = new PrimitiveRestartState(ptr.ElementType);
result.StateList.Add(glState);
}
return(result);
}
private PrimitiveRestartState GetPrimitiveRestartState(OneIndexBuffer indexBuffer)
{
PrimitiveRestartState result = null;
switch (indexBuffer.ElementType)
{
case IndexBufferElementType.UByte:
if (this.ubyteRestartIndexState == null)
{
this.ubyteRestartIndexState = new PrimitiveRestartState(indexBuffer.ElementType);
}
result = this.ubyteRestartIndexState;
break;
case IndexBufferElementType.UShort:
if (this.ushortRestartIndexState == null)
{
this.ushortRestartIndexState = new PrimitiveRestartState(indexBuffer.ElementType);
}
result = this.ushortRestartIndexState;
break;
case IndexBufferElementType.UInt:
if (this.uintRestartIndexState == null)
{
this.uintRestartIndexState = new PrimitiveRestartState(indexBuffer.ElementType);
}
result = this.uintRestartIndexState;
break;
default:
throw new NotDealWithNewEnumItemException(typeof(IndexBufferElementType));
}
return(result);
}
/// <summary>
/// 遍历以<paramref name="lastVertexId"/>为最后一个顶点的图元，
/// 瞄准每个图元的索引（例如1个三角形有3个索引）中的最后一个索引，
/// 将此索引在<see cref="IndexBuffer"/>中的索引（位置）收集起来。
/// </summary>
/// <param name="arg"></param>
/// <param name="lastVertexId"></param>
/// <returns></returns>
private List <RecognizedPrimitiveInfo> GetLastIndexIdList(PickingEventArgs arg, uint lastVertexId)
{
var drawCmd = this.DrawCommand;
DrawMode mode = drawCmd.Mode;
PrimitiveRecognizer recognizer = PrimitiveRecognizerFactory.Create(
(arg.GeometryType.Contains(GeometryType.Point) &&
mode.ToGeometryType() == GeometryType.Line) ?
DrawMode.Points : mode);
PrimitiveRestartState glState = GetPrimitiveRestartState();
List <RecognizedPrimitiveInfo> primitiveInfoList = null;
if (glState == null)
{
primitiveInfoList = recognizer.Recognize(lastVertexId, drawCmd);
}
else
{
primitiveInfoList = recognizer.Recognize(lastVertexId, drawCmd, glState.RestartIndex);
}
return(primitiveInfoList);
}
private PrimitiveRestartState GetPrimitiveRestartState(OneIndexBuffer indexBuffer)
{
PrimitiveRestartState result = null;
switch (indexBuffer.ElementType)
{
case IndexBufferElementType.UByte:
if (this.ubyteRestartIndexState == null)
{
this.ubyteRestartIndexState = new PrimitiveRestartState(indexBuffer.ElementType);
}
result = this.ubyteRestartIndexState;
break;
case IndexBufferElementType.UShort:
if (this.ushortRestartIndexState == null)
{
this.ushortRestartIndexState = new PrimitiveRestartState(indexBuffer.ElementType);
}
result = this.ushortRestartIndexState;
break;
case IndexBufferElementType.UInt:
if (this.uintRestartIndexState == null)
{
this.uintRestartIndexState = new PrimitiveRestartState(indexBuffer.ElementType);
}
result = this.uintRestartIndexState;
break;
default:
throw new Exception("Unexpected IndexBufferElementType!");
}
return(result);
}
/// <summary>
///
/// </summary>
protected override void DoInitialize()
{
// init shader program.
ShaderProgram program = this.renderProgramProvider.GetShaderProgram();
ShaderProgram pickProgram = this.pickProgramProvider.GetShaderProgram();
// init vertex attribute buffer objects.
IBufferable model = this.DataSource;
VertexBuffer positionBuffer = null;
VertexShaderAttribute[] vertexAttributeBuffers;
{
var list = new List <VertexShaderAttribute>();
foreach (AttributeMap.NamePair item in this.attributeMap)
{
VertexBuffer buffer = model.GetVertexAttributeBuffer(
item.NameInIBufferable, item.VarNameInShader);
if (buffer == null)
{
throw new Exception(string.Format("[{0}] returns null buffer pointer!", model));
}
list.Add(new VertexShaderAttribute(buffer, item.VarNameInShader));
if (item.VarNameInShader == this.PositionNameInVertexShader)
{
positionBuffer = buffer;
}
}
vertexAttributeBuffers = list.ToArray();
}
// 由于picking.vert/frag只支持vec3的position buffer，所以有此硬性规定。
if (positionBuffer == null || positionBuffer.Config != VBOConfig.Vec3)
{
throw new Exception(string.Format("Position buffer must use a type composed of 3 float as PropertyBuffer<T>'s T!"));
}
// init index buffer.
IndexBuffer indexBuffer = model.GetIndexBuffer();
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care this rule when designing a model's index buffer.
var ptr = indexBuffer as OneIndexBuffer;
if (ptr != null)
{
GLState glState = new PrimitiveRestartState(ptr.ElementType);
this.stateList.Add(glState);
this.picker = new OneIndexPicker(this);
}
else
{
this.picker = new ZeroIndexPicker(this);
}
// init VAO.
var vertexArrayObject = new VertexArrayObject(indexBuffer, vertexAttributeBuffers);
vertexArrayObject.Initialize(program);
var pickingVAO = new VertexArrayObject(indexBuffer, new VertexShaderAttribute(positionBuffer, "in_Position"));
pickingVAO.Initialize(pickProgram);
// sets fields.
this.RenderProgram = program;
this.PickProgram = pickProgram;
this.vertexShaderAttributes = vertexAttributeBuffers;
this.positionBuffer = positionBuffer;
this.indexBuffer = indexBuffer;
this.vertexArrayObject = vertexArrayObject;
this.pickVertexArrayObject = pickingVAO;
}
/// <summary>
///
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public IPickableRenderMethod ToRenderMethod(IBufferSource model)
{
// init shader program.
ShaderProgram pickProgram = this.programProvider.GetShaderProgram();
// init vertex attribute buffer objects.
var positionBuffers = new List <VertexBuffer>(); // position attribute is divided into blocks.
// we only care about the position attribute.
foreach (var buffer in model.GetVertexAttributeBuffer(this.positionNameInIBufferSource))
{
if (buffer == null)
{
throw new Exception(string.Format("[{0}] returns null buffer pointer!", model));
}
positionBuffers.Add(buffer);
}
int blockCount = positionBuffers.Count;
// RULE: 由于picking.vert/frag只支持vec3的position buffer，所以有此硬性规定。
foreach (var buffer in positionBuffers)
{
if (buffer == null || buffer.Config != VBOConfig.Vec3)
{
throw new Exception(string.Format("Position buffer must use a type composed of 3 float as PropertyBuffer<T>'s T!"));
}
}
// init draw command.
var allDrawCommands = (from item in model.GetDrawCommand()
where (item != null)
select item).ToArray();
int cmdCount = allDrawCommands.Length;
if (cmdCount != blockCount)
{
throw new Exception("Draw Commands count != vertex buffer block count.");
}
// init VAO.
var pickingVAOs = new VertexArrayObject[cmdCount];
for (int b = 0; b < cmdCount; b++)
{
var vertexAttributeBuffers = new VertexShaderAttribute(positionBuffers[b], PickingShaderHelper.in_Position);
pickingVAOs[b] = new VertexArrayObject(allDrawCommands[b], pickProgram, vertexAttributeBuffers);
}
var renderUnit = new IPickableRenderMethod(pickProgram, pickingVAOs, positionBuffers.ToArray(), this.states);
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care this rule when designing a model's index buffer.
foreach (var cmd in allDrawCommands)
{
var ptr = cmd as IHasIndexBuffer;
if (ptr != null)
{
GLState glState = new PrimitiveRestartState(ptr.IndexBufferObject.ElementType);
renderUnit.StateList.Add(glState);
break;
}
}
return(renderUnit);
}
/// <summary>
///
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public RenderMethod ToRenderMethod(IBufferSource model)
{
// init shader program.
ShaderProgram program = this.programProvider.GetShaderProgram();
// init vertex attribute buffer objects.
var attrCount = this.map.Count(); // how many kinds of vertex attributes?
var allBlocks = new List <VertexBuffer> [attrCount];
var allNames = new string[attrCount];
int blockCount = 0; // how many blocks an attribute is divided into?
int index = 0;
foreach (AttributeMap.NamePair item in this.map)
{
blockCount = 0;
allBlocks[index] = new List <VertexBuffer>();
foreach (var buffer in model.GetVertexAttributeBuffer(item.NameInIBufferSource))
{
if (buffer == null)
{
throw new Exception(string.Format("[{0}] returns null buffer pointer!", model));
}
allBlocks[index].Add(buffer);
allNames[index] = item.VarNameInShader;
blockCount++;
}
if (blockCount != allBlocks[0].Count)
{
throw new Exception("Not all vertex attribute buffers' block count are the same!");
}
index++;
}
// init draw commands.
var drawCmds = (from item in model.GetDrawCommand()
where (item != null)
select item).ToArray();
int cmdCount = drawCmds.Length;
if (attrCount > 0 && cmdCount != blockCount)
{
throw new Exception("Draw Commands count != vertex buffer block count.");
}
// init VAOs.
var vaos = new VertexArrayObject[cmdCount];
for (int c = 0; c < cmdCount; c++)
{
var vertexShaderAttributes = new VertexShaderAttribute[attrCount];
for (int a = 0; a < attrCount; a++)
{
List <VertexBuffer> vertexAttribute = allBlocks[a];
string varNameInShader = allNames[a];
vertexShaderAttributes[a] = new VertexShaderAttribute(vertexAttribute[c], varNameInShader);
}
vaos[c] = new VertexArrayObject(drawCmds[c], program, vertexShaderAttributes);
}
var renderUnit = new RenderMethod(program, vaos, this.states);
// RULE: Renderer takes uint.MaxValue, ushort.MaxValue or byte.MaxValue as PrimitiveRestartIndex. So take care of this rule when designing a model's index buffer.
foreach (var cmd in drawCmds)
{
var ptr = cmd as IHasIndexBuffer;
if (ptr != null)
{
GLState glState = new PrimitiveRestartState(ptr.IndexBufferObject.ElementType);
renderUnit.StateList.Add(glState);
break;
}
}
return(renderUnit);
}
