private unsafe void ImGuiRenderDraw(DrawData *drawData)
{
if (drawData == null)
{
return;
}
var io = ImGui.GetIO();
if (io.DisplaySize.X <= 0.0f || io.DisplaySize.Y <= 0.0f)
{
return;
}
var st = new StateBlock(device, StateBlockType.All);
var vp = new Viewport();
vp.X = vp.Y = 0;
vp.Width = (int)io.DisplaySize.X;
vp.Height = (int)io.DisplaySize.Y;
vp.MinDepth = 0.0f;
vp.MaxDepth = 1.0f;
device.Viewport = vp;
device.PixelShader = null;
device.VertexShader = null;
device.SetRenderState(RenderState.CullMode, Cull.None);
device.SetRenderState(RenderState.Lighting, false);
device.SetRenderState(RenderState.ZEnable, false);
device.SetRenderState(RenderState.AlphaBlendEnable, true);
device.SetRenderState(RenderState.AlphaTestEnable, false);
device.SetRenderState(RenderState.BlendOperation, BlendOperation.Add);
device.SetRenderState(RenderState.SourceBlend, Blend.SourceAlpha);
device.SetRenderState(RenderState.DestinationBlend, Blend.BothInverseSourceAlpha);
device.SetRenderState(RenderState.ScissorTestEnable, true);
device.SetTextureStageState(0, TextureStage.ColorOperation, TextureOperation.Modulate);
device.SetTextureStageState(0, TextureStage.ColorArg1, TextureArgument.Texture);
device.SetTextureStageState(0, TextureStage.ColorArg2, TextureArgument.Diffuse);
device.SetTextureStageState(0, TextureStage.AlphaOperation, TextureOperation.Modulate);
device.SetTextureStageState(0, TextureStage.AlphaArg1, TextureArgument.Texture);
device.SetTextureStageState(0, TextureStage.AlphaArg2, TextureArgument.Diffuse);
device.SetSamplerState(0, SamplerState.MinFilter, TextureFilter.Linear);
device.SetSamplerState(0, SamplerState.MagFilter, TextureFilter.Linear);
// Setup orthographic projection matrix
{
const float L = 0.5f;
float R = io.DisplaySize.X + 0.5f;
const float T = 0.5f;
float B = io.DisplaySize.Y + 0.5f;
RawMatrix mat_identity = new Matrix(1.0f, 0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f);
RawMatrix mat_projection = new Matrix(
2.0f / (R - L), 0.0f, 0.0f, 0.0f,
0.0f, 2.0f / (T - B), 0.0f, 0.0f,
0.0f, 0.0f, 0.5f, 0.0f,
(L + R) / (L - R), (T + B) / (B - T), 0.5f, 1.0f);
device.SetTransform(TransformState.World, ref mat_identity);
device.SetTransform(TransformState.View, ref mat_identity);
device.SetTransform(TransformState.Projection, ref mat_projection);
}
using (device.VertexDeclaration = new VertexDeclaration(device, GuiVertex.VertexElements))
{
for (var n = 0; n < drawData->CmdListsCount; n++)
{
NativeDrawList *cmdList = drawData->CmdLists[n];
DrawVert * vtx_buffer = (DrawVert *)cmdList->VtxBuffer.Data;
ushort * idx_buffer = (ushort *)cmdList->IdxBuffer.Data;
var myCustomVertices = new GuiVertex[cmdList->VtxBuffer.Size];
for (var i = 0; i < myCustomVertices.Length; i++)
{
var cl = (vtx_buffer[i].col & 0xFF00FF00) | ((vtx_buffer[i].col & 0xFF0000) >> 16) | ((vtx_buffer[i].col & 0xFF) << 16);
myCustomVertices[i] =
new GuiVertex(vtx_buffer[i].pos.X, vtx_buffer[i].pos.Y, vtx_buffer[i].uv.X, vtx_buffer[i].uv.Y, cl);
}
for (var i = 0; i < cmdList->CmdBuffer.Size; i++)
{
DrawCmd *pcmd = &((DrawCmd *)cmdList->CmdBuffer.Data)[i];
if (pcmd->UserCallback != IntPtr.Zero)
{
throw new NotImplementedException();
}
else
{
device.SetTexture(0, new Texture(pcmd->TextureId));
device.ScissorRect = new RectangleF((int)pcmd->ClipRect.X,
(int)pcmd->ClipRect.Y,
(int)(pcmd->ClipRect.Z - pcmd->ClipRect.X),
(int)(pcmd->ClipRect.W - pcmd->ClipRect.Y));
ushort[] indices = new ushort[pcmd->ElemCount];
for (int j = 0; j < indices.Length; j++)
{
indices[j] = idx_buffer[j];
}
device.DrawIndexedUserPrimitives(PrimitiveType.TriangleList, 0, myCustomVertices.Length, (int)(pcmd->ElemCount / 3), indices, Format.Index16, myCustomVertices);
}
idx_buffer += pcmd->ElemCount;
}
}
}
st.Apply();
st.Dispose();
}
