public void Copy(IntPtr source)
{
BindTexture();
GL.TexImage2D(TextureTarget2d.Texture2D, 0, ComponentCount, Width, Height, 0, PixelFormat, PixelType.UnsignedByte, source);
GLException.CheckError("Copy(TexImage2D)");
GL.TexSubImage2D(TextureTarget2d.Texture2D, 0, 0, 0, Width, Height, PixelFormat, PixelType.UnsignedByte, source);
GLException.CheckError("Copy(TexSubImage2D)");
UnbindTexture();
}
public Texture2D(int width, int height, PixelFormat pixelFormat, TextureComponentCount componentCount, TextureUnit slot)
{
Width = width;
Height = height;
PixelFormat = pixelFormat;
TextureSlot = slot;
ComponentCount = componentCount;
GLTexture = GL.GenTexture();
GLException.CheckError("Texture2D");
}
private int CompileShader(ShaderType type, string source)
{
GLException.CheckError("Before CreateShader(" + type + ")");
int Shader = GL.CreateShader(type);
GL.ShaderSource(Shader, 1, new string[] { source }, new int[] { source.Length });
GL.CompileShader(Shader);
GL.GetShader(Shader, ShaderParameter.CompileStatus, out int success);
if (success != 1)
{
GL.GetShaderInfoLog(Shader, out string infoLog);
throw new GLException(ErrorCode.InvalidOperation, $"GL.CompileShader for shader [{type}] had info log: {infoLog}");
}
return(Shader);
}
public void CreateDeviceResources()
{
_vertexBufferSize = 10000;
_indexBufferSize = 2000;
_shader = new Shader(Properties.Resources.imgui_vertex_glsl, Properties.Resources.imgui_fragment_glsl);
// Create VertexBufferVertexArray object
_vertexBuffer = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ArrayBuffer, _vertexBuffer);
// Vector2
int posLocation = _shader.GetAttributeLocation("in_position");
GL.EnableVertexAttribArray(posLocation);
GL.VertexAttribPointer(posLocation, 2, VertexAttribPointerType.Float, false, IM_DRAW_VERT_SIZE, 0);
// Vector2
int uvLocation = _shader.GetAttributeLocation("in_texCoord");
GL.EnableVertexAttribArray(uvLocation);
GL.VertexAttribPointer(uvLocation, 2, VertexAttribPointerType.Float, false, IM_DRAW_VERT_SIZE, 8);
// uint
int colorLocation = _shader.GetAttributeLocation("in_color");
GL.EnableVertexAttribArray(colorLocation);
GL.VertexAttribPointer(colorLocation, 4, VertexAttribPointerType.UnsignedByte, true, IM_DRAW_VERT_SIZE, 16);
GL.BufferData(BufferTarget.ArrayBuffer, _vertexBufferSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
_indexBuffer = GL.GenBuffer();
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _indexBuffer);
GL.BufferData(BufferTarget.ElementArrayBuffer, _indexBufferSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
RecreateFontDeviceTexture();
GLException.CheckError("ImGui Setup");
}
public Shader(string vertexShader, string fragmentShader)
{
int vertShader = CompileShader(ShaderType.VertexShader, vertexShader);
GLException.CheckError("Compile vertex shader");
int fragShader = CompileShader(ShaderType.FragmentShader, fragmentShader);
GLException.CheckError("Compile fragment shader");
Program = GL.CreateProgram();
GLException.CheckError("Create shader program");
GL.AttachShader(Program, vertShader);
GL.AttachShader(Program, fragShader);
GL.LinkProgram(Program);
GL.GetProgram(Program, GetProgramParameterName.LinkStatus, out int Success);
if (Success == 0)
{
throw new GLException(ErrorCode.InvalidOperation, "GL.LinkProgram had info log: " + GL.GetProgramInfoLog(Program));
}
GL.DeleteShader(vertShader);
GL.DeleteShader(fragShader);
GLException.CheckError("Shader");
}
public Texture2D(int width, int height, PixelFormat pixelFormat, TextureComponentCount componentCount, TextureUnit slot, IntPtr data) : this(width, height, pixelFormat, componentCount, slot)
{
Copy(data);
GLException.CheckError("Texture2D");
}
/*
* internal void PressChar(char keyChar)
* {
* PressedChars.Add(keyChar);
* }
*
* private static void SetKeyMappings()
* {
* ImGuiIOPtr io = ImGui.GetIO();
* io.KeyMap[(int)ImGuiKey.Tab] = (int)Key.Tab;
* io.KeyMap[(int)ImGuiKey.LeftArrow] = (int)Key.Left;
* io.KeyMap[(int)ImGuiKey.RightArrow] = (int)Key.Right;
* io.KeyMap[(int)ImGuiKey.UpArrow] = (int)Key.Up;
* io.KeyMap[(int)ImGuiKey.DownArrow] = (int)Key.Down;
* io.KeyMap[(int)ImGuiKey.PageUp] = (int)Key.PageUp;
* io.KeyMap[(int)ImGuiKey.PageDown] = (int)Key.PageDown;
* io.KeyMap[(int)ImGuiKey.Home] = (int)Key.Home;
* io.KeyMap[(int)ImGuiKey.End] = (int)Key.End;
* io.KeyMap[(int)ImGuiKey.Delete] = (int)Key.Delete;
* io.KeyMap[(int)ImGuiKey.Backspace] = (int)Key.BackSpace;
* io.KeyMap[(int)ImGuiKey.Enter] = (int)Key.Enter;
* io.KeyMap[(int)ImGuiKey.Escape] = (int)Key.Escape;
* io.KeyMap[(int)ImGuiKey.A] = (int)Key.A;
* io.KeyMap[(int)ImGuiKey.C] = (int)Key.C;
* io.KeyMap[(int)ImGuiKey.V] = (int)Key.V;
* io.KeyMap[(int)ImGuiKey.X] = (int)Key.X;
* io.KeyMap[(int)ImGuiKey.Y] = (int)Key.Y;
* io.KeyMap[(int)ImGuiKey.Z] = (int)Key.Z;
* }
*/
private void RenderImDrawData(ImDrawDataPtr draw_data)
{
uint vertexOffsetInVertices = 0;
uint indexOffsetInElements = 0;
if (draw_data.CmdListsCount == 0)
{
return;
}
uint totalVBSize = (uint)(draw_data.TotalVtxCount * IM_DRAW_VERT_SIZE);
if (totalVBSize > _vertexBufferSize)
{
int newSize = (int)Math.Max(_vertexBufferSize * 1.5f, totalVBSize);
GL.BindBuffer(BufferTarget.ArrayBuffer, _vertexBuffer);
GL.BufferData(BufferTarget.ArrayBuffer, newSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
_vertexBufferSize = newSize;
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
Console.WriteLine($"Resized vertex buffer to new size {_vertexBufferSize}");
}
uint totalIBSize = (uint)(draw_data.TotalIdxCount * sizeof(ushort));
if (totalIBSize > _indexBufferSize)
{
int newSize = (int)Math.Max(_indexBufferSize * 1.5f, totalIBSize);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _indexBuffer);
GL.BufferData(BufferTarget.ElementArrayBuffer, newSize, IntPtr.Zero, BufferUsageHint.DynamicDraw);
_indexBufferSize = newSize;
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
Console.WriteLine($"Resized index buffer to new size {_indexBufferSize}");
}
for (int i = 0; i < draw_data.CmdListsCount; i++)
{
ImDrawListPtr cmd_list = draw_data.CmdListsRange[i];
GL.BindBuffer(BufferTarget.ArrayBuffer, _vertexBuffer);
GL.BufferSubData(BufferTarget.ArrayBuffer, (IntPtr)(vertexOffsetInVertices * IM_DRAW_VERT_SIZE), cmd_list.VtxBuffer.Size * IM_DRAW_VERT_SIZE, cmd_list.VtxBuffer.Data);
GLException.CheckError($"Data Vert {i}");
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _indexBuffer);
GL.BufferSubData(BufferTarget.ElementArrayBuffer, (IntPtr)(indexOffsetInElements * sizeof(ushort)), cmd_list.IdxBuffer.Size * sizeof(ushort), cmd_list.IdxBuffer.Data);
GLException.CheckError($"Data Idx {i}");
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
vertexOffsetInVertices += (uint)cmd_list.VtxBuffer.Size;
indexOffsetInElements += (uint)cmd_list.IdxBuffer.Size;
}
// Setup orthographic projection matrix into our constant buffer
ImGuiIOPtr io = ImGui.GetIO();
Matrix4 mvp = Matrix4.CreateOrthographicOffCenter(0, io.DisplaySize.X, io.DisplaySize.Y, 0.0f, -1.0f, 1.0f);
_shader.UseShader();
GL.UniformMatrix4(_shader.GetUniformLocation("projection_matrix"), false, ref mvp);
GL.Uniform1(_shader.GetUniformLocation("in_fontTexture"), 0);
GLException.CheckError("Projection");
GL.BindBuffer(BufferTarget.ArrayBuffer, _vertexBuffer);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _indexBuffer);
GLException.CheckError("VAO");
draw_data.ScaleClipRects(io.DisplayFramebufferScale);
GL.Enable(EnableCap.Blend);
GL.Enable(EnableCap.ScissorTest);
GL.BlendEquation(BlendEquationMode.FuncAdd);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
GL.Disable(EnableCap.CullFace);
GL.Disable(EnableCap.DepthTest);
GLException.CheckError("ImGUI EnableCap");
// Render command lists
int vtx_offset = 0;
int idx_offset = 0;
GLException.CheckError("Bind Font Texture");
for (int n = 0; n < draw_data.CmdListsCount; n++)
{
ImDrawListPtr cmd_list = draw_data.CmdListsRange[n];
for (int cmd_i = 0; cmd_i < cmd_list.CmdBuffer.Size; cmd_i++)
{
ImDrawCmdPtr pcmd = cmd_list.CmdBuffer[cmd_i];
if (pcmd.UserCallback != IntPtr.Zero)
{
throw new NotImplementedException();
}
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, (int)pcmd.TextureId);
// We do _windowHeight - (int)clip.W instead of (int)clip.Y because gl has flipped Y when it comes to these coordinates
var clip = pcmd.ClipRect;
GL.Scissor((int)clip.X, _windowHeight - (int)clip.W, (int)(clip.Z - clip.X), (int)(clip.W - clip.Y));
GLException.CheckError("Scissor");
GL.DrawElements(PrimitiveType.Triangles, (int)pcmd.ElemCount, DrawElementsType.UnsignedShort, (IntPtr)((idx_offset * sizeof(ushort)) + vtx_offset));
GLException.CheckError("DrawElements");
idx_offset += (int)pcmd.ElemCount;
}
vtx_offset += cmd_list.VtxBuffer.Size;
}
//_fontTexture.UnbindTexture();
GL.Disable(EnableCap.Blend);
GL.Disable(EnableCap.ScissorTest);
// unbind VAO
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
}