/// <summary>
/// Draw a model with the vertex-/index-buffers to accelerate the drawing
/// </summary>
/// <param name="modelInstance">Instanciation information</param>
static void DrawModelInstanciated(ModelInstance modelInstance)
{
if (modelInstance.VertexBufferSize == 0)
{
return;
}
Material material = modelInstance.Material;
Texture2D texture = material.colorTex;
Texture2D lightmap = material.lightTex;
foreach (ModelMesh mesh in modelInstance.Model.Meshes)
{
foreach (ModelMeshPart part in mesh.MeshParts)
{
// Tell the GPU to read from both the model vertex buffer plus our instanceVertexBuffer.
GraphicsDevice.SetVertexBuffers(
new VertexBufferBinding(part.VertexBuffer, part.VertexOffset, 0),
new VertexBufferBinding(modelInstance.VertexBuffer, 0, 1)
);
GraphicsDevice.Indices = part.IndexBuffer;
// load the instanciation effect and set the correct technique based on the material
part.Effect = _instanceEffect;
_instanceEffect.CurrentTechnique = _instanceEffect.Techniques[material.RenderingType.ToString()];
// Set properties which are valid for all cameras
// - Transformation
_instanceEffect.Parameters["World"].SetValue(mesh.ParentBone.Transform);
// - Texture
_instanceEffect.Parameters["ColorTexture"].SetValue(texture);
_instanceEffect.Parameters["LightmapTexture"].SetValue(lightmap);
foreach (Camera cam in Screen.Cameras)
{
GraphicsDevice.Viewport = cam.Viewport;
// Set camera-properties for shader
_instanceEffect.Parameters["View"].SetValue(cam.View);
_instanceEffect.Parameters["Projection"].SetValue(cam.Proj);
// Draw all the instance copies in a single call.
foreach (EffectPass pass in _instanceEffect.CurrentTechnique.Passes)
{
pass.Apply();
GraphicsDevice.DrawInstancedPrimitives(PrimitiveType.TriangleList, 0, 0,
part.NumVertices, part.StartIndex,
part.PrimitiveCount, modelInstance.VertexInformation.Length);
}
}
}
}
}
/// <summary>
/// Add a gameobject to an instance to draw
/// </summary>
/// <param name="modelType">Model-type on which the gameobject is added</param>
/// <param name="gameObject"></param>
public static void AddInstance(ModelType modelType, GameObject gameObject)
{
if (ModelTransformations.ContainsKey(modelType))
{
ModelInstance modelInstance = ModelTransformations[modelType];
modelInstance.Add(gameObject);
// Store reference to the model and material on the gameobject so that there is an instant access
gameObject.Model = modelInstance.Model;
gameObject.material = modelInstance.Material;
}
else
{
Debug.LogError("ModelType " + modelType.GetDescription() + " not properly initialized");
}
}
/// <summary>
/// Draw a model with the vertex-/index-buffers to accelerate the drawing
/// </summary>
/// <param name="modelInstance">Instanciation information</param>
/// <param name="effect"></param>
static void DrawModelInstanciated(ModelInstance modelInstance, Effect effect)
{
if (modelInstance.GameObjects.Count == 0)
{
return;
}
foreach (ModelMesh mesh in modelInstance.Model.Meshes)
{
foreach (ModelMeshPart part in mesh.MeshParts)
{
// Tell the GPU to read from both the model vertex buffer plus our instanceVertexBuffer.
GraphicsDevice.SetVertexBuffers(
new VertexBufferBinding(part.VertexBuffer, part.VertexOffset, 0),
new VertexBufferBinding(modelInstance.VertexBuffer, 0, 1)
);
GraphicsDevice.Indices = part.IndexBuffer;
// load the instanciation effect and set the correct technique based on the material
part.Effect = effect;
// Set properties which are valid for all cameras
// - Transformation
effect.Parameters["World"].SetValue(mesh.ParentBone.Transform);
foreach (Camera cam in Screen.Cameras)
{
GraphicsDevice.Viewport = cam.Viewport;
// Set camera-properties for shader
effect.Parameters["View"].SetValue(cam.View);
effect.Parameters["Projection"].SetValue(cam.Proj);
// Draw all the instance copies in a single call.
foreach (EffectPass pass in effect.CurrentTechnique.Passes)
{
pass.Apply();
GraphicsDevice.DrawInstancedPrimitives(PrimitiveType.TriangleList, 0, 0,
part.NumVertices, part.StartIndex,
part.PrimitiveCount, modelInstance.VertexInformation.Length);
}
}
}
}
}
/// <summary>
/// Initialize a new model for hardware-instanciation
/// </summary>
/// <param name="modelType">Type of the model to store uniquely</param>
/// <param name="model">Model which is used for instancing</param>
/// <param name="material">Material which is used for instancing</param>
public static void InitializeModel(ModelType modelType, Model model, Material material)
{
ModelTransformations[modelType] = new ModelInstance(model, material);
}
