public static unsafe void Draw()
{
GLRenderTexture.Reset();
OnOpenGL?.Invoke();
SetContext();
//ImGui.Render();
IGRender();
}
private unsafe static void IGUpdate(float dt)
{
SetContext();
GLRenderTexture.Reset();
var ioptr = ImGuiNative.igGetIO();
ioptr->DeltaTime = dt;
ioptr->DisplaySize = new System.Numerics.Vector2(
Viewport.Width / ImGuiScale.X,
Viewport.Height / ImGuiScale.Y
);
ioptr->DisplayFramebufferScale = ImGuiScale;
}
private static void IGRender2(ImDrawDataPtr dd)
{
SetContext();
GLRenderTexture.Reset();
GL.Viewport(0, 0, Engine.Width, Engine.Height);
if (dd.CmdListsCount == 0)
{
return;
}
for (int i = 0; i < dd.CmdListsCount; i++)
{
ImDrawListPtr cmd_list = dd.CmdListsRange[i];
int vertexSize = cmd_list.VtxBuffer.Size * Unsafe.SizeOf <ImDrawVert>();
if (vertexSize > VtxBufSize)
{
int newSize = (int)Math.Max(VtxBufSize * 1.5f, vertexSize);
GL.NamedBufferData(VertexBuffer, newSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
VtxBufSize = newSize;
}
int indexSize = cmd_list.IdxBuffer.Size * sizeof(ushort);
if (indexSize > IdxBufSize)
{
int newSize = (int)Math.Max(IdxBufSize * 1.5f, indexSize);
GL.NamedBufferData(IndexBuffer, newSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
IdxBufSize = newSize;
}
}
var io = ImGui.GetIO();
var MVP = Matrix4.CreateOrthographicOffCenter(0.0f, Viewport.Width, Viewport.Height, 0.0f, -1.0f, 1.0f);
ImGuiProgram.Use();
ImGuiProgram.UniformMatrix4("Projection", ref MVP);
GL.Uniform1(ImGuiProgram.UniformLocation("Texture"), 0);
IG_VAO.Bind();
dd.ScaleClipRects(io.DisplayFramebufferScale);
GL.Enable(EnableCap.Blend);
GL.Enable(EnableCap.ScissorTest);
GL.BlendEquation(BlendEquationMode.FuncAdd);
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
GL.Disable(EnableCap.CullFace);
GL.Disable(EnableCap.DepthTest);
for (int n = 0; n < dd.CmdListsCount; n++)
{
ImDrawListPtr cmdList = dd.CmdListsRange[n];
GL.NamedBufferSubData(VertexBuffer, IntPtr.Zero, cmdList.VtxBuffer.Size * Unsafe.SizeOf <ImDrawVert>(), cmdList.VtxBuffer.Data);
GL.NamedBufferSubData(IndexBuffer, IntPtr.Zero, cmdList.IdxBuffer.Size * sizeof(ushort), cmdList.IdxBuffer.Data);
int vOffset = 0;
int iOffset = 0;
for (int i = 0; i < cmdList.CmdBuffer.Size; i++)
{
ImDrawCmdPtr pcmd = cmdList.CmdBuffer[i];
if (pcmd.UserCallback != IntPtr.Zero)
{
throw new NotImplementedException();
}
else
{
GLTexture.Active(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, (int)pcmd.TextureId);
var clip = pcmd.ClipRect;
GL.Scissor((int)clip.X, Viewport.Height - (int)clip.W, (int)(clip.Z - clip.X), (int)(clip.W - clip.Y));
if ((io.BackendFlags & ImGuiBackendFlags.RendererHasVtxOffset) != 0)
{
GL.DrawElementsBaseVertex(PrimitiveType.Triangles, (int)pcmd.ElemCount, DrawElementsType.UnsignedShort, (IntPtr)(iOffset * sizeof(ushort)), vOffset);
}
else
{
GL.DrawElements(BeginMode.Triangles, (int)pcmd.ElemCount, DrawElementsType.UnsignedShort, (int)pcmd.IdxOffset * sizeof(ushort));
}
}
iOffset += (int)pcmd.ElemCount;
}
vOffset += cmdList.VtxBuffer.Size;
}
GL.Disable(EnableCap.Blend);
GL.Disable(EnableCap.ScissorTest);
}