private void ApplyStateCore(GraphicsContext ctx, ShaderProgram program, BlendState currentState)
{
if (Enabled)
{
// Enable blending
if (currentState.Enabled == false)
{
Gl.Enable(EnableCap.Blend);
}
// Set blending equation
if (ctx.Extensions.BlendMinmax_EXT)
{
if (EquationSeparated)
{
if (currentState.RgbEquation != RgbEquation || currentState.AlphaEquation != AlphaEquation)
{
Gl.BlendEquationSeparate(RgbEquation, AlphaEquation);
}
}
else
{
if (currentState.RgbEquation != RgbEquation)
{
Gl.BlendEquation(RgbEquation);
}
}
}
// Set blending function
if (FunctionSeparated)
{
if (currentState._RgbSrcFactor != _RgbSrcFactor || currentState._RgbDstFactor != _RgbDstFactor || currentState._AlphaSrcFactor != _AlphaSrcFactor || currentState._AlphaDstFactor != _AlphaDstFactor)
{
Gl.BlendFuncSeparate(_RgbSrcFactor, _RgbDstFactor, _AlphaSrcFactor, _AlphaDstFactor);
}
}
else
{
if (currentState._RgbSrcFactor != _RgbSrcFactor || currentState._RgbDstFactor != _RgbDstFactor)
{
Gl.BlendFunc(_RgbSrcFactor, _RgbDstFactor);
}
}
// Set blend color, if required
if (RequiresConstColor(_RgbSrcFactor) || RequiresConstColor(_AlphaSrcFactor) || RequiresConstColor(_RgbDstFactor) || RequiresConstColor(_AlphaDstFactor))
{
Gl.BlendColor(_BlendColor.r, _BlendColor.g, _BlendColor.b, _BlendColor.a);
}
}
else
{
// Disable blending
if (currentState.Enabled == true)
{
Gl.Disable(EnableCap.Blend);
}
}
}
/// <summary>
/// Set ShaderProgram state.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> which has defined the shader program <paramref name="sProgram"/>.
/// </param>
/// <param name="sProgram">
/// The <see cref="ShaderProgram"/> which has the state set.
/// </param>
public override void ApplyState(GraphicsContext ctx, ShaderProgram sProgram)
{
if (ctx == null)
{
throw new ArgumentNullException("ctx");
}
BlendState currentState = null; // (BlendState)ctx.CurrentState[StateId];
if (Enabled)
{
// Enable blending
if (currentState == null || !currentState.Enabled)
{
Gl.Enable(EnableCap.Blend);
}
// Set blending equation
if (ctx.Caps.GlExtensions.BlendMinmax_EXT)
{
if (EquationSeparated)
{
Gl.BlendEquationSeparate(RgbEquation, AlphaEquation);
}
else
{
Gl.BlendEquation((int)RgbEquation);
}
}
// Set blending function
if (FunctionSeparated)
{
Gl.BlendFuncSeparate((int)mRgbSrcFactor, (int)mRgbDstFactor, (int)mAlphaSrcFactor, (int)mAlphaDstFactor);
}
else
{
Gl.BlendFunc(mRgbSrcFactor, mRgbDstFactor);
}
// Set blend color, if required
if (RequiresConstColor(mRgbSrcFactor) || RequiresConstColor(mAlphaSrcFactor) || RequiresConstColor(mRgbDstFactor) || RequiresConstColor(mAlphaDstFactor))
{
Gl.BlendColor(mBlendColor.Red, mBlendColor.Green, mBlendColor.Blue, mBlendColor.Alpha);
}
}
else
{
// Disable blending
if (currentState == null || currentState.Enabled)
{
Gl.Disable(EnableCap.Blend);
}
}
}
static void SetupState()
{
Gl.Enable(EnableCap.DepthTest);
Gl.DepthMask(true);
Gl.Enable(EnableCap.CullFace);
Gl.CullFace(CullFaceMode.Back);
Gl.Enable(EnableCap.Blend);
Gl.BlendEquationSeparate(BlendEquationMode.FuncAdd, BlendEquationMode.FuncAdd);
Gl.BlendFuncSeparate(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha, BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
}
private void ApplyStateCore(GraphicsContext ctx, ShaderProgram program)
{
if (Enabled)
{
// Enable blending
Gl.Enable(EnableCap.Blend);
// Set blending equation
if (ctx.Extensions.BlendMinmax_EXT)
{
if (EquationSeparated)
{
Gl.BlendEquationSeparate(RgbEquation, AlphaEquation);
}
else
{
Gl.BlendEquation((int)RgbEquation);
}
}
// Set blending function
if (FunctionSeparated)
{
Gl.BlendFuncSeparate((int)_RgbSrcFactor, (int)_RgbDstFactor, (int)_AlphaSrcFactor, (int)_AlphaDstFactor);
}
else
{
Gl.BlendFunc(_RgbSrcFactor, _RgbDstFactor);
}
// Set blend color, if required
if (RequiresConstColor(_RgbSrcFactor) || RequiresConstColor(_AlphaSrcFactor) || RequiresConstColor(_RgbDstFactor) || RequiresConstColor(_AlphaDstFactor))
{
Gl.BlendColor(_BlendColor.Red, _BlendColor.Green, _BlendColor.Blue, _BlendColor.Alpha);
}
}
else
{
// Disable blending
Gl.Disable(EnableCap.Blend);
}
}
static void CreateContext(/*params string[] RequiredExtensions*/)
{
GConsole.WriteLine("Initializing OpenGL");
#if DEBUG
Khronos.KhronosApi.Log += (S, E) => {
if (E.Name == "glGetError")
{
return;
}
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine("OpenGL> {0}", string.Format("{0}({1}) = {2}", E.Name, string.Join(", ", E.Args), E.ReturnValue ?? "null"));
Console.ResetColor();
};
Khronos.KhronosApi.LogEnabled = false; //*/
#endif
GConsole.WriteLine("Initializing GLFW");
Glfw.ConfigureNativesDirectory("native/glfw3_64");
if (!Glfw.Init())
{
FatalError("Could not initialize GLFW");
}
Glfw.SetErrorCallback((Err, Msg) => {
FatalError("GLFW({0}) {1}", Err, Msg);
});
Width = CVar.GetInt("width", 800);
Height = CVar.GetInt("height", 600);
Glfw.WindowHint(Glfw.Hint.Resizable, CVar.GetBool("resizable"));
//Glfw.WindowHint(Glfw.Hint.ClientApi, Glfw.ClientApi.None);
Glfw.WindowHint(Glfw.Hint.ClientApi, Glfw.ClientApi.OpenGL);
Glfw.WindowHint(Glfw.Hint.ContextCreationApi, Glfw.ContextApi.Native);
Glfw.WindowHint(Glfw.Hint.Doublebuffer, CVar.GetBool("gl_doublebuffer"));
Glfw.WindowHint(Glfw.Hint.ContextVersionMajor, CVar.GetInt("gl_major"));
Glfw.WindowHint(Glfw.Hint.ContextVersionMinor, CVar.GetInt("gl_minor"));
Glfw.WindowHint(Glfw.Hint.Samples, CVar.GetInt("gl_samples"));
Glfw.WindowHint(Glfw.Hint.OpenglForwardCompat, CVar.GetBool("gl_forwardcompat"));
Glfw.WindowHint(Glfw.Hint.OpenglProfile, Glfw.OpenGLProfile.Core);
#if DEBUG
Glfw.WindowHint(Glfw.Hint.OpenglDebugContext, true);
#endif
GConsole.WriteLine("Creating window");
Window = Glfw.CreateWindow(Width, Height, "libTech");
if (!Window)
{
FatalError("Could not create window({0}x{1})", Width, Height);
}
Gl.Initialize();
Glfw.MakeContextCurrent(Window);
/*bool AllSupported = true;
*
* for (int i = 0; i < RequiredExtensions.Length; i++) {
* if (!Glfw.ExtensionSupported(RequiredExtensions[i])) {
* GConsole.WriteLine("{0} not supported", RequiredExtensions[i]);
* AllSupported = false;
* }
* }
*
* if (!AllSupported)
* while (true)
* Thread.Sleep(10);*/
#if DEBUG
Gl.DebugMessageCallback((Src, DbgType, ID, Severity, Len, Buffer, UserPtr) => {
if (Severity == Gl.DebugSeverity.Notification)
{
return;
}
GConsole.WriteLine("OpenGL {0} {1} {2}, {3}", Src, DbgType, ID, Severity);
GConsole.WriteLine(Encoding.ASCII.GetString((byte *)Buffer, Len));
if ((/*Severity == Gl.DebugSeverity.Medium ||*/ Severity == Gl.DebugSeverity.High) && Debugger.IsAttached)
{
Debugger.Break();
}
}, IntPtr.Zero);
Gl.Enable((EnableCap)Gl.DEBUG_OUTPUT);
Gl.Enable((EnableCap)Gl.DEBUG_OUTPUT_SYNCHRONOUS);
#endif
GConsole.WriteLine("{0}, {1}", Gl.GetString(StringName.Vendor), Gl.GetString(StringName.Renderer));
GConsole.WriteLine("OpenGL {0}", Gl.GetString(StringName.Version));
GConsole.WriteLine("GLSL {0}", Gl.GetString(StringName.ShadingLanguageVersion));
Gl.ClearColor(69 / 255.0f, 112 / 255.0f, 56 / 255.0f, 1.0f);
// F**k the police
Gl.Enable((EnableCap)Gl.DEPTH_CLAMP);
Gl.Enable(EnableCap.Blend);
//Gl.VERTEX_PROGRAM_POINT_SIZE;
Gl.Enable((EnableCap)Gl.VERTEX_PROGRAM_POINT_SIZE);
//Gl.Enable((EnableCap)Gl.SAMPLE_SHADING);
//Gl.Enable(EnableCap.FramebufferSrgb);
Gl.BlendEquationSeparate(BlendEquationMode.FuncAdd, BlendEquationMode.FuncAdd);
Gl.BlendFuncSeparate(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha, BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
//Gl.BlendEquation(BlendEquationMode.FuncAdd);
//Gl.BlendFunc(BlendingFactor.One, BlendingFactor.One);
ShaderProgram.LoadDefaultShaders();
}
public void RenderDrawData(ImDrawDataPtr drawData)
{
// Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
var fbWidth = drawData.DisplaySize.X * drawData.FramebufferScale.X;
var fbHeight = drawData.DisplaySize.Y * drawData.FramebufferScale.Y;
if (fbWidth < 0 || fbHeight < 0)
{
return;
}
if (!drawData.Valid || drawData.CmdListsCount == 0)
{
return;
}
// Backup GL state
// The vast majority of this probably is not necessary, and ideally should be handled by the main render application
// with a state cache if actually required.
// At the very least, however, it appears that SDL does not maintain/reset its own state perfectly when using opengl
// and the scissor rect will break things. Since I'm not sure if anything else would also break, and since this backup
// is not nearly as terrible as the DX11 version was, I am leaving this in place for now.
Gl.GetInteger(GetPName.ActiveTexture, out int lastActiveTexture);
Gl.GetInteger(GetPName.CurrentProgram, out int lastProgram);
Gl.GetInteger(GetPName.TextureBinding2d, out int lastTexture);
Gl.GetInteger(GetPName.ArrayBufferBinding, out int lastArrayBuffer);
Gl.GetInteger(GetPName.VertexArrayBinding, out int lastVertexArrayObject);
Gl.GetInteger(GetPName.PolygonMode, out int lastPolygonMode);
var lastViewport = new int[4];
Gl.Get(GetPName.Viewport, lastViewport);
var lastScissorBox = new int[4];
Gl.Get(GetPName.ScissorBox, lastScissorBox);
Gl.GetInteger(GetPName.BlendSrcRgb, out int lastBlendSrcRgb);
Gl.GetInteger(GetPName.BlendDstRgb, out int lastBlendDstRgb);
Gl.GetInteger(GetPName.BlendSrcAlpha, out int lastBlendSrcAlpha);
Gl.GetInteger(GetPName.BlendDstAlpha, out int lastBlendDstAlpha);
Gl.GetInteger(GetPName.BlendEquationRgb, out int lastBlendEquationRgb);
Gl.GetInteger(GetPName.BlendEquationAlpha, out int lastBlendEquationAlpha);
var lastEnableBlend = Gl.IsEnabled(EnableCap.Blend);
var lastEnableCullFace = Gl.IsEnabled(EnableCap.CullFace);
var lastEnableDepthTest = Gl.IsEnabled(EnableCap.DepthTest);
var lastEnableScissorTest = Gl.IsEnabled(EnableCap.ScissorTest);
// Setup desired GL state
Gl.ActiveTexture(TextureUnit.Texture0);
// Recreate the VAO every time (this is to easily allow multiple GL contexts to be rendered to. VAO are not shared among GL contexts)
// The renderer would actually work without any VAO bound, but then our VertexAttrib calls would overwrite the default one currently bound.
_vertexArrayObject = Gl.GenVertexArray();
SetupRenderState(drawData);
// Will project scissor/clipping rectangles into framebuffer space
var clipOff = drawData.DisplayPos; // (0,0) unless using multi-viewports
var clipScale = drawData.FramebufferScale; // (1,1) unless using retina display which are often (2,2)
// Render command lists
for (var n = 0; n < drawData.CmdListsCount; n++)
{
var cmdList = drawData.CmdListsRange[n];
// Upload vertex/index buffers
// TODO: this is *awful*
Gl.BufferData(BufferTarget.ArrayBuffer, (uint)(cmdList.VtxBuffer.Size * Unsafe.SizeOf <ImDrawVert>()), cmdList.VtxBuffer.Data, BufferUsage.StreamDraw);
Gl.BufferData(BufferTarget.ElementArrayBuffer, (uint)(cmdList.IdxBuffer.Size * sizeof(ushort)), cmdList.IdxBuffer.Data, BufferUsage.StreamDraw);
for (var i = 0; i < cmdList.CmdBuffer.Size; i++)
{
var pcmd = cmdList.CmdBuffer[i];
if (pcmd.UserCallback != IntPtr.Zero)
{
// TODO
throw new NotImplementedException();
}
else
{
// Project scissor/clipping rectangles into framebuffer space
var clipRect = new Vector4
{
X = (pcmd.ClipRect.X - clipOff.X) * clipScale.X,
Y = (pcmd.ClipRect.Y - clipOff.Y) * clipScale.Y,
Z = (pcmd.ClipRect.Z - clipOff.X) * clipScale.X,
W = (pcmd.ClipRect.W - clipOff.Y) * clipScale.Y,
};
if (clipRect.X < fbWidth && clipRect.Y < fbHeight && clipRect.Z >= 0 && clipRect.W >= 0)
{
// Apply scissor/clipping rectangle
Gl.Scissor((int)clipRect.X, (int)(fbHeight - clipRect.W), (int)(clipRect.Z - clipRect.X), (int)(clipRect.W - clipRect.Y));
// Bind texture, Draw
Gl.BindTexture(TextureTarget.Texture2d, (uint)pcmd.TextureId);
Gl.DrawElementsBaseVertex(PrimitiveType.Triangles, (int)pcmd.ElemCount, DrawElementsType.UnsignedShort, (IntPtr)(pcmd.IdxOffset * sizeof(short)), (int)pcmd.VtxOffset);
}
}
}
}
// Destroy the temporary VAO
Gl.DeleteVertexArrays(_vertexArrayObject);
// Restore modified GL state
Gl.UseProgram((uint)lastProgram);
Gl.BindTexture(TextureTarget.Texture2d, (uint)lastTexture);
Gl.ActiveTexture((TextureUnit)lastActiveTexture);
Gl.BindVertexArray((uint)lastVertexArrayObject);
Gl.BindBuffer(BufferTarget.ArrayBuffer, (uint)lastArrayBuffer);
Gl.BlendEquationSeparate((BlendEquationMode)lastBlendEquationRgb, (BlendEquationMode)lastBlendEquationAlpha);
Gl.BlendFuncSeparate((BlendingFactor)lastBlendSrcRgb, (BlendingFactor)lastBlendDstRgb, (BlendingFactor)lastBlendSrcAlpha, (BlendingFactor)lastBlendDstAlpha);
if (lastEnableBlend)
{
Gl.Enable(EnableCap.Blend);
}
else
{
Gl.Disable(EnableCap.Blend);
}
if (lastEnableCullFace)
{
Gl.Enable(EnableCap.CullFace);
}
else
{
Gl.Disable(EnableCap.CullFace);
}
if (lastEnableDepthTest)
{
Gl.Enable(EnableCap.DepthTest);
}
else
{
Gl.Disable(EnableCap.DepthTest);
}
if (lastEnableScissorTest)
{
Gl.Enable(EnableCap.ScissorTest);
}
else
{
Gl.Disable(EnableCap.ScissorTest);
}
Gl.PolygonMode(MaterialFace.FrontAndBack, (PolygonMode)lastPolygonMode);
Gl.Viewport(lastViewport[0], lastViewport[1], lastViewport[2], lastViewport[3]);
Gl.Scissor(lastScissorBox[0], lastScissorBox[1], lastScissorBox[2], lastScissorBox[3]);
}