/// <summary>
/// Constructs a new ImGuiRenderer.
/// </summary>
/// <param name="gd">The GraphicsDevice used to create and update resources.</param>
/// <param name="outputDescription">The output format.</param>
/// <param name="width">The initial width of the rendering target. Can be resized.</param>
/// <param name="height">The initial height of the rendering target. Can be resized.</param>
/// <param name="colorSpaceHandling">Identifies how the renderer should treat vertex colors.</param>
public ImGuiRenderer(GraphicsDevice gd, OutputDescription outputDescription, int width, int height, ColorSpaceHandling colorSpaceHandling)
{
_gd = gd;
_assembly = typeof(ImGuiRenderer).GetTypeInfo().Assembly;
_colorSpaceHandling = colorSpaceHandling;
_windowWidth = width;
_windowHeight = height;
_fontTexture = Renderer.GlobalTexturePool.AllocateTextureDescriptor();
IntPtr context = ImGui.CreateContext();
ImGui.SetCurrentContext(context);
var io = ImGui.GetIO();
io.ConfigFlags |= ImGuiConfigFlags.DockingEnable;
ImGui.GetIO().Fonts.AddFontDefault();
CreateDeviceResources(gd, outputDescription);
SetOpenTKKeyMappings();
SetPerFrameImGuiData(1f / 60f);
}
public void CreateDeviceResources(GraphicsDevice gd, OutputDescription outputDescription, ColorSpaceHandling colorSpaceHandling)
{
_gd = gd;
_colorSpaceHandling = colorSpaceHandling;
ResourceFactory factory = gd.ResourceFactory;
_vertexBuffer = factory.CreateBuffer(new BufferDescription(10000, BufferUsage.VertexBuffer | BufferUsage.Dynamic));
_vertexBuffer.Name = "ImGui.NET Vertex Buffer";
_indexBuffer = factory.CreateBuffer(new BufferDescription(2000, BufferUsage.IndexBuffer | BufferUsage.Dynamic));
_indexBuffer.Name = "ImGui.NET Index Buffer";
RecreateFontDeviceTexture(gd);
_projMatrixBuffer = factory.CreateBuffer(new BufferDescription(64, BufferUsage.UniformBuffer | BufferUsage.Dynamic));
_projMatrixBuffer.Name = "ImGui.NET Projection Buffer";
byte[] vertexShaderBytes = LoadEmbeddedShaderCode(gd.ResourceFactory, "imgui-vertex", ShaderStages.Vertex, _colorSpaceHandling);
byte[] fragmentShaderBytes = LoadEmbeddedShaderCode(gd.ResourceFactory, "imgui-frag", ShaderStages.Fragment, _colorSpaceHandling);
_vertexShader = factory.CreateShader(new ShaderDescription(ShaderStages.Vertex, vertexShaderBytes, "VS"));
_fragmentShader = factory.CreateShader(new ShaderDescription(ShaderStages.Fragment, fragmentShaderBytes, "FS"));
VertexLayoutDescription[] vertexLayouts = new VertexLayoutDescription[]
{
new VertexLayoutDescription(
new VertexElementDescription("in_position", VertexElementSemantic.Position, VertexElementFormat.Float2),
new VertexElementDescription("in_texCoord", VertexElementSemantic.TextureCoordinate, VertexElementFormat.Float2),
new VertexElementDescription("in_color", VertexElementSemantic.Color, VertexElementFormat.Byte4_Norm))
};
_layout = factory.CreateResourceLayout(new ResourceLayoutDescription(
new ResourceLayoutElementDescription("ProjectionMatrixBuffer", ResourceKind.UniformBuffer, ShaderStages.Vertex),
new ResourceLayoutElementDescription("MainSampler", ResourceKind.Sampler, ShaderStages.Fragment)));
_textureLayout = factory.CreateResourceLayout(new ResourceLayoutDescription(
new ResourceLayoutElementDescription("MainTexture", ResourceKind.TextureReadOnly, ShaderStages.Fragment)));
GraphicsPipelineDescription pd = new GraphicsPipelineDescription(
BlendStateDescription.SingleAlphaBlend,
new DepthStencilStateDescription(false, false, ComparisonKind.Always),
new RasterizerStateDescription(FaceCullMode.None, PolygonFillMode.Solid, FrontFace.Clockwise, true, true),
PrimitiveTopology.TriangleList,
new ShaderSetDescription(
vertexLayouts,
new[] { _vertexShader, _fragmentShader },
new[]
{
new SpecializationConstant(0, gd.IsClipSpaceYInverted),
new SpecializationConstant(1, _colorSpaceHandling == ColorSpaceHandling.Legacy),
}),
new ResourceLayout[] { _layout, _textureLayout },
outputDescription,
ResourceBindingModel.Default);
_pipeline = factory.CreateGraphicsPipeline(ref pd);
_mainResourceSet = factory.CreateResourceSet(new ResourceSetDescription(_layout,
_projMatrixBuffer,
gd.PointSampler));
_fontTextureResourceSet = factory.CreateResourceSet(new ResourceSetDescription(_textureLayout, _fontTextureView));
}
/// <summary>
/// Constructs a new ImGuiRenderer.
/// </summary>
/// <param name="gd">The GraphicsDevice used to create and update resources.</param>
/// <param name="outputDescription">The output format.</param>
/// <param name="width">The initial width of the rendering target. Can be resized.</param>
/// <param name="height">The initial height of the rendering target. Can be resized.</param>
/// <param name="colorSpaceHandling">Identifies how the renderer should treat vertex colors.</param>
public ImGuiRenderer(GraphicsDevice gd, OutputDescription outputDescription, int width, int height, ColorSpaceHandling colorSpaceHandling)
{
_gd = gd;
_assembly = typeof(ImGuiRenderer).GetTypeInfo().Assembly;
_colorSpaceHandling = colorSpaceHandling;
_windowWidth = width;
_windowHeight = height;
ResetContext(gd, outputDescription);
}
private byte[] LoadEmbeddedShaderCode(
ResourceFactory factory,
string name,
ShaderStages stage,
ColorSpaceHandling colorSpaceHandling)
{
switch (factory.BackendType)
{
case GraphicsBackend.Direct3D11:
{
if (stage == ShaderStages.Vertex && colorSpaceHandling == ColorSpaceHandling.Legacy)
{
name += "-legacy";
}
string resourceName = name + ".hlsl.bytes";
return(GetEmbeddedResourceBytes(resourceName));
}
case GraphicsBackend.OpenGL:
{
if (stage == ShaderStages.Vertex && colorSpaceHandling == ColorSpaceHandling.Legacy)
{
name += "-legacy";
}
string resourceName = name + ".glsl";
return(GetEmbeddedResourceBytes(resourceName));
}
case GraphicsBackend.OpenGLES:
{
if (stage == ShaderStages.Vertex && colorSpaceHandling == ColorSpaceHandling.Legacy)
{
name += "-legacy";
}
string resourceName = name + ".glsles";
return(GetEmbeddedResourceBytes(resourceName));
}
case GraphicsBackend.Vulkan:
{
string resourceName = name + ".spv";
return(GetEmbeddedResourceBytes(resourceName));
}
case GraphicsBackend.Metal:
{
string resourceName = name + ".metallib";
return(GetEmbeddedResourceBytes(resourceName));
}
default:
throw new NotImplementedException();
}
}
/// <summary>
/// Constructs a new ImGuiRenderer.
/// </summary>
/// <param name="gd">The GraphicsDevice used to create and update resources.</param>
/// <param name="outputDescription">The output format.</param>
/// <param name="width">The initial width of the rendering target. Can be resized.</param>
/// <param name="height">The initial height of the rendering target. Can be resized.</param>
/// <param name="colorSpaceHandling">Identifies how the renderer should treat vertex colors.</param>
public ImGuiRenderer(GraphicsDevice gd, OutputDescription outputDescription, int width, int height, ColorSpaceHandling colorSpaceHandling)
{
_gd = gd;
_assembly = typeof(ImGuiRenderer).GetTypeInfo().Assembly;
_colorSpaceHandling = colorSpaceHandling;
_windowWidth = width;
_windowHeight = height;
IntPtr context = ImGui.CreateContext();
ImGui.SetCurrentContext(context);
ImGui.GetIO().Fonts.AddFontDefault();
CreateDeviceResources(gd, outputDescription);
SetOpenTKKeyMappings();
SetPerFrameImGuiData(1f / 60f);
ImGui.NewFrame();
_frameBegun = true;
}
