private void Clean(Context context)
{
if (_dirty)
{
if (_va != null)
{
_va.Dispose();
_va = null;
_drawState.VertexArray = null;
_drawStateSolid.VertexArray = null;
}
Mesh mesh = BoxTessellator.Compute(2 * _shape.Radii);
_va = context.CreateVertexArray(mesh, _drawState.ShaderProgram.VertexAttributes, BufferHint.StaticDraw);
_drawState.VertexArray = _va;
_drawStateSolid.VertexArray = _va;
_primitiveType = mesh.PrimitiveType;
_renderState.FacetCulling.FrontFaceWindingOrder = mesh.FrontFaceWindingOrder;
((Uniform <Vector3F>)_drawState.ShaderProgram.Uniforms["u_globeOneOverRadiiSquared"]).Value = _shape.OneOverRadiiSquared.ToVector3F();
((Uniform <Vector3F>)_drawStateSolid.ShaderProgram.Uniforms["u_globeOneOverRadiiSquared"]).Value = _shape.OneOverRadiiSquared.ToVector3F();
if (_wireframe != null)
{
_wireframe.Dispose();
_wireframe = null;
}
_wireframe = new Wireframe(context, mesh);
_wireframe.FacetCullingFace = CullFace.Front;
_wireframe.Width = 3;
_dirty = false;
}
}
private void Update(Context context)
{
if (_dirtyVA)
{
Vector3D radii = new Vector3D(_tileResolution.X, _tileResolution.Y,
(_tileMaximumHeight - _tileMinimumHeight) * _heightExaggeration.Value);
Vector3D halfRadii = 0.5 * radii;
Mesh mesh = BoxTessellator.Compute(radii);
//
// TEXEL_SPACE_TODO: Translate box so it is not centered at
// the origin - world space and texel space will match up.
//
IList <Vector3D> positions = ((VertexAttributeDoubleVector3)mesh.Attributes["position"]).Values;
for (int i = 0; i < positions.Count; ++i)
{
positions[i] = positions[i] + halfRadii;
}
if (_drawState.VertexArray != null)
{
_drawState.VertexArray.Dispose();
_drawState.VertexArray = null;
}
_drawState.VertexArray = context.CreateVertexArray(mesh, _drawState.ShaderProgram.VertexAttributes, BufferHint.StaticDraw);
_primitiveType = mesh.PrimitiveType;
_drawState.RenderState.FacetCulling.FrontFaceWindingOrder = mesh.FrontFaceWindingOrder;
if (_wireframe != null)
{
_wireframe.Dispose();
}
_wireframe = new Wireframe(context, mesh);
_wireframe.FacetCullingFace = CullFace.Front;
_wireframe.Width = 3;
_dirtyVA = false;
}
}
protected unsafe override void CreateResources(ResourceFactory factory)
{
//创建一个最大半径的Cube
var boxMesh = BoxTessellator.Compute(Shape.Radii * 2f);
//创建此mesh的相关资源
_mesh = boxMesh;
//创建texture和textureview
var inPath = @"E:\swyy\Lib\veldrid-samples\assets\Earth.png";
ImageSharpTexture inputImage = new ImageSharpTexture(inPath, false);
_surfaceTexture = inputImage.CreateDeviceTexture(GraphicsDevice, factory);
_surfaceTextureView = factory.CreateTextureView(_surfaceTexture);
//创建一个顶点缓冲数据
_vertexBuffer = factory.CreateBuffer(new BufferDescription((uint)boxMesh.Positions.Length * VertexPosition.SizeInBytes, BufferUsage.VertexBuffer));
_indexBuffer = factory.CreateBuffer(new BufferDescription((uint)(sizeof(ushort) * boxMesh.Indices.Length), BufferUsage.IndexBuffer));
_uboBuffer = factory.CreateBuffer(new BufferDescription(144, BufferUsage.UniformBuffer | BufferUsage.Dynamic));
//提前更新raddisquard参数
_uboBase = new BaseUBO();
//提前更新关照模型等固定参数
//更新光照模型
var DiffuseIntensity = 0.65f;
var SpecularIntensity = 0.25f;
var AmbientIntensity = 0.10f;
var Shininess = 12;
var lightModel = new Vector4(
DiffuseIntensity,
SpecularIntensity,
AmbientIntensity,
Shininess);
_uboBase.DiffuseSpecularAmbientShininess = lightModel;
_uboBase.GlobeOneOverRadiiSquared = Shape.OneOverRadiiSquared;
_uboBase.UseAverageDepth = false;
//提前更新参数
GraphicsDevice.UpdateBuffer(_uboBuffer, 0, _uboBase);
//创建prj的资源布局作为地球的默认资源布局
ResourceLayout projViewLayout = factory.CreateResourceLayout(
new ResourceLayoutDescription(
new ResourceLayoutElementDescription("UBO", ResourceKind.UniformBuffer, ShaderStages.Vertex | ShaderStages.Fragment)
));
//创建prj的资源
_projViewSet = factory.CreateResourceSet(new ResourceSetDescription(
projViewLayout,
_uboBuffer
));
GraphicsDevice.UpdateBuffer(_vertexBuffer, 0, _mesh.Positions);
GraphicsDevice.UpdateBuffer(_indexBuffer, 0, _mesh.Indices);
//创建texture和sampler资源布局
ResourceLayout worldTextureLayout = factory.CreateResourceLayout(
new ResourceLayoutDescription(
new ResourceLayoutElementDescription("SurfaceTexture", ResourceKind.TextureReadOnly, ShaderStages.Fragment),
new ResourceLayoutElementDescription("SurfaceSampler", ResourceKind.Sampler, ShaderStages.Fragment)));
//创建textureset
_textureSet = factory.CreateResourceSet(new ResourceSetDescription(
worldTextureLayout,
_surfaceTextureView,
GraphicsDevice.Aniso4xSampler
));
//创建shaderprograme,仅传入inWorldPosition
ShaderSetDescription shaderSet = new ShaderSetDescription(
new[]
{
new VertexLayoutDescription(
new VertexElementDescription("inPosition", VertexElementSemantic.Position, VertexElementFormat.Float3))
},
new Shader[]
{
LoadEmbbedShader(ShaderStages.Vertex, "GlobeVS.spv"),
LoadEmbbedShader(ShaderStages.Fragment, "GlobeFS.spv")
});
//创建渲染管线
_pipeline = factory.CreateGraphicsPipeline(new GraphicsPipelineDescription(
BlendStateDescription.SingleOverrideBlend,
DepthStencilStateDescription.DepthOnlyLessEqual,
RasterizerStateDescription.Default,
PrimitiveTopology.TriangleList,
shaderSet,
new[] { projViewLayout, worldTextureLayout },
MainSwapchain.Framebuffer.OutputDescription));
//创建一个命令队列
_cl = factory.CreateCommandList();
}
