unsafe void RenderImDrawData(ImDrawDataPtr draw_data, RenderState rstate)
{
var io = ImGui.GetIO();
//Set cursor
var cur = ImGuiNative.igGetMouseCursor();
switch (cur)
{
case ImGuiMouseCursor.Arrow:
game.CursorKind = CursorKind.Arrow;
break;
case ImGuiMouseCursor.ResizeAll:
game.CursorKind = CursorKind.Move;
break;
case ImGuiMouseCursor.TextInput:
game.CursorKind = CursorKind.TextInput;
break;
case ImGuiMouseCursor.ResizeNS:
game.CursorKind = CursorKind.ResizeNS;
break;
case ImGuiMouseCursor.ResizeNESW:
game.CursorKind = CursorKind.ResizeNESW;
break;
case ImGuiMouseCursor.ResizeNWSE:
game.CursorKind = CursorKind.ResizeNWSE;
break;
}
//Render
draw_data.ScaleClipRects(io.DisplayFramebufferScale);
var mat = Matrix4.CreateOrthographicOffCenter(0, game.Width, game.Height, 0, 0, 1);
Shader lastShader = textShader;
textShader.SetMatrix(textShader.GetLocation("modelviewproj"), ref mat);
textShader.SetInteger(textShader.GetLocation("tex"), 0);
colorShader.SetMatrix(textShader.GetLocation("modelviewproj"), ref mat);
colorShader.SetInteger(textShader.GetLocation("tex"), 0);
textShader.UseProgram();
rstate.Cull = false;
rstate.BlendMode = BlendMode.Normal;
rstate.DepthEnabled = false;
for (int n = 0; n < draw_data.CmdListsCount; n++)
{
var cmd_list = draw_data.CmdListsRange[n];
byte * vtx_buffer = (byte *)cmd_list.VtxBuffer.Data;
ushort *idx_buffer = (ushort *)cmd_list.IdxBuffer.Data;
var vtxCount = cmd_list.VtxBuffer.Size;
var idxCount = cmd_list.IdxBuffer.Size;
if (vboSize < vtxCount || iboSize < idxCount)
{
if (vbo != null)
{
vbo.Dispose();
}
if (ibo != null)
{
ibo.Dispose();
}
vboSize = Math.Max(vboSize, vtxCount);
iboSize = Math.Max(iboSize, idxCount);
vbo = new VertexBuffer(typeof(Vertex2D), vboSize, true);
ibo = new ElementBuffer(iboSize, true);
vbo.SetElementBuffer(ibo);
vbuffer = new Vertex2D[vboSize];
ibuffer = new ushort[iboSize];
}
for (int i = 0; i < cmd_list.IdxBuffer.Size; i++)
{
ibuffer[i] = idx_buffer[i];
}
for (int i = 0; i < cmd_list.VtxBuffer.Size; i++)
{
var ptr = (ImDrawVert *)vtx_buffer;
var unint = ptr[i].col;
var a = unint >> 24 & 0xFF;
var b = unint >> 16 & 0xFF;
var g = unint >> 8 & 0xFF;
var r = unint & 0xFF;
vbuffer[i] = new Vertex2D(ptr[i].pos, ptr[i].uv, new Color4(r / 255f, g / 255f, b / 255f, a / 255f));
}
vbo.SetData(vbuffer, cmd_list.VtxBuffer.Size);
ibo.SetData(ibuffer, cmd_list.IdxBuffer.Size);
int startIndex = 0;
for (int cmd_i = 0; cmd_i < cmd_list.CmdBuffer.Size; cmd_i++)
{
var pcmd = cmd_list.CmdBuffer[cmd_i];
//TODO: Do something with pcmd->UserCallback ??
var tid = pcmd.TextureId.ToInt32();
Texture2D tex;
if (tid == FONT_TEXTURE_ID)
{
if (lastShader != textShader)
{
textShader.UseProgram();
lastShader = textShader;
}
fontTexture.BindTo(0);
}
else if (textures.TryGetValue(tid, out tex))
{
if (lastShader != colorShader)
{
colorShader.UseProgram();
lastShader = colorShader;
}
tex.BindTo(0);
}
else
{
dot.BindTo(0);
}
GL.Enable(GL.GL_SCISSOR_TEST);
GL.Scissor(
(int)pcmd.ClipRect.X,
(int)(io.DisplaySize.Y - pcmd.ClipRect.W),
(int)(pcmd.ClipRect.Z - pcmd.ClipRect.X),
(int)(pcmd.ClipRect.W - pcmd.ClipRect.Y));
vbo.Draw(PrimitiveTypes.TriangleList, 0, startIndex, (int)pcmd.ElemCount / 3);
GL.Disable(GL.GL_SCISSOR_TEST);
startIndex += (int)pcmd.ElemCount;
}
}
}