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// Function that will draw all the models instantiated in the list
void DrawModelHardwareInstancing(Model model,Texture2D texture, Matrix[] modelBones,
Matrix[] instances, Matrix view, Matrix projection)
{
Game.GraphicsDevice.SamplerStates[0] = SamplerState.LinearWrap;
if (instances.Length == 0)
return;
// If we have more instances than room in our vertex buffer, grow it to the neccessary size.
if ((instanceVertexBuffer == null) ||
(instances.Length > instanceVertexBuffer.VertexCount))
{
if (instanceVertexBuffer != null)
instanceVertexBuffer.Dispose();
instanceVertexBuffer = new DynamicVertexBuffer(Game.GraphicsDevice, instanceVertexDeclaration,
instances.Length, BufferUsage.WriteOnly);
}
// Transfer the latest instance transform matrices into the instanceVertexBuffer.
instanceVertexBuffer.SetData(instances, 0, instances.Length, SetDataOptions.Discard);
foreach (ModelMesh mesh in model.Meshes)
{
foreach (ModelMeshPart meshPart in mesh.MeshParts)
{
// Tell the GPU to read from both the model vertex buffer plus our instanceVertexBuffer.
Game.GraphicsDevice.SetVertexBuffers(
new VertexBufferBinding(meshPart.VertexBuffer, meshPart.VertexOffset, 0),
new VertexBufferBinding(instanceVertexBuffer, 0, 1)
);
Game.GraphicsDevice.Indices = meshPart.IndexBuffer;
// Set up the instance rendering effect.
Effect effect = meshPart.Effect;
//effect.CurrentTechnique = effect.Techniques["HardwareInstancing"];
effect.Parameters["World"].SetValue(modelBones[mesh.ParentBone.Index]);
effect.Parameters["View"].SetValue(view);
effect.Parameters["Projection"].SetValue(projection);
effect.Parameters["Texture"].SetValue(texture);
// Draw all the instance copies in a single call.
foreach (EffectPass pass in effect.CurrentTechnique.Passes)
{
pass.Apply();
Game.GraphicsDevice.DrawInstancedPrimitives(PrimitiveType.TriangleList, 0, 0,
meshPart.NumVertices, meshPart.StartIndex,
meshPart.PrimitiveCount, instances.Length);
}
}
}
}
// ### end function DrawModelHardwareInstancing |
Partager