From 1df2e91812719e2976fda07c7a90333fcbe1de7d Mon Sep 17 00:00:00 2001
From: Nick Renieris <velocityra@gmail.com>
Date: Sat, 27 Apr 2019 01:39:19 +0300
Subject: [PATCH] gui: Add Cherry imgui theme

From here: https://github.com/ocornut/imgui/issues/707#issuecomment-430613104
---
 src/gui/gui.cpp | 94 ++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 85 insertions(+), 9 deletions(-)

diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 11cd0e7..dc1da29 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -50,13 +50,75 @@ __declspec(dllexport) uint32_t AmdPowerXpressRequestHighPerformance = 1;
 
 namespace gui {
 
-static void gl_after_callback(const glbinding::FunctionCall& fn) {
-  for (GLenum error = glGetError(); error != GL_NO_ERROR; error = glGetError()) {
-    std::stringstream gl_error;
-    gl_error << error;
-    LOG_ERROR("OpenGL: {} set error {}.", fn.function->name(), gl_error.str());
-    assert(0);
-  }
+void init_theme() {
+  // cherry colors, 3 intensities
+#define HI(v) ImVec4(0.502f, 0.075f, 0.256f, v)
+#define MED(v) ImVec4(0.455f, 0.198f, 0.301f, v)
+#define LOW(v) ImVec4(0.232f, 0.201f, 0.271f, v)
+// backgrounds (@todo: complete with BG_MED, BG_LOW)
+#define BG(v) ImVec4(0.200f, 0.220f, 0.270f, v)
+// text
+#define TEXT(v) ImVec4(0.860f, 0.930f, 0.890f, v)
+
+  auto& style = ImGui::GetStyle();
+  style.Colors[ImGuiCol_Text] = TEXT(0.78f);
+  style.Colors[ImGuiCol_TextDisabled] = TEXT(0.28f);
+  style.Colors[ImGuiCol_WindowBg] = ImVec4(0.13f, 0.14f, 0.17f, 1.00f);
+  style.Colors[ImGuiCol_ChildWindowBg] = BG(0.58f);
+  style.Colors[ImGuiCol_PopupBg] = BG(0.9f);
+  style.Colors[ImGuiCol_Border] = ImVec4(0.31f, 0.31f, 1.00f, 0.00f);
+  style.Colors[ImGuiCol_BorderShadow] = ImVec4(0.00f, 0.00f, 0.00f, 0.00f);
+  style.Colors[ImGuiCol_FrameBg] = BG(1.00f);
+  style.Colors[ImGuiCol_FrameBgHovered] = MED(0.78f);
+  style.Colors[ImGuiCol_FrameBgActive] = MED(1.00f);
+  style.Colors[ImGuiCol_TitleBg] = LOW(1.00f);
+  style.Colors[ImGuiCol_TitleBgActive] = HI(1.00f);
+  style.Colors[ImGuiCol_TitleBgCollapsed] = BG(0.75f);
+  style.Colors[ImGuiCol_MenuBarBg] = BG(0.47f);
+  style.Colors[ImGuiCol_ScrollbarBg] = BG(1.00f);
+  style.Colors[ImGuiCol_ScrollbarGrab] = ImVec4(0.09f, 0.15f, 0.16f, 1.00f);
+  style.Colors[ImGuiCol_ScrollbarGrabHovered] = MED(0.78f);
+  style.Colors[ImGuiCol_ScrollbarGrabActive] = MED(1.00f);
+  style.Colors[ImGuiCol_CheckMark] = ImVec4(0.71f, 0.22f, 0.27f, 1.00f);
+  style.Colors[ImGuiCol_SliderGrab] = ImVec4(0.47f, 0.77f, 0.83f, 0.14f);
+  style.Colors[ImGuiCol_SliderGrabActive] = ImVec4(0.71f, 0.22f, 0.27f, 1.00f);
+  style.Colors[ImGuiCol_Button] = ImVec4(0.47f, 0.77f, 0.83f, 0.14f);
+  style.Colors[ImGuiCol_ButtonHovered] = MED(0.86f);
+  style.Colors[ImGuiCol_ButtonActive] = MED(1.00f);
+  style.Colors[ImGuiCol_Header] = MED(0.76f);
+  style.Colors[ImGuiCol_HeaderHovered] = MED(0.86f);
+  style.Colors[ImGuiCol_HeaderActive] = HI(1.00f);
+  style.Colors[ImGuiCol_Column] = ImVec4(0.14f, 0.16f, 0.19f, 1.00f);
+  style.Colors[ImGuiCol_ColumnHovered] = MED(0.78f);
+  style.Colors[ImGuiCol_ColumnActive] = MED(1.00f);
+  style.Colors[ImGuiCol_ResizeGrip] = ImVec4(0.47f, 0.77f, 0.83f, 0.04f);
+  style.Colors[ImGuiCol_ResizeGripHovered] = MED(0.78f);
+  style.Colors[ImGuiCol_ResizeGripActive] = MED(1.00f);
+  style.Colors[ImGuiCol_PlotLines] = TEXT(0.63f);
+  style.Colors[ImGuiCol_PlotLinesHovered] = MED(1.00f);
+  style.Colors[ImGuiCol_PlotHistogram] = TEXT(0.63f);
+  style.Colors[ImGuiCol_PlotHistogramHovered] = MED(1.00f);
+  style.Colors[ImGuiCol_TextSelectedBg] = MED(0.43f);
+  style.Colors[ImGuiCol_ModalWindowDarkening] = BG(0.73f);
+
+  style.WindowPadding = ImVec2(6, 4);
+  style.WindowRounding = 0.0f;
+  style.FramePadding = ImVec2(5, 2);
+  style.FrameRounding = 3.0f;
+  style.ItemSpacing = ImVec2(7, 1);
+  style.ItemInnerSpacing = ImVec2(1, 1);
+  style.TouchExtraPadding = ImVec2(0, 0);
+  style.IndentSpacing = 6.0f;
+  style.ScrollbarSize = 12.0f;
+  style.ScrollbarRounding = 16.0f;
+  style.GrabMinSize = 20.0f;
+  style.GrabRounding = 2.0f;
+
+  style.WindowTitleAlign.x = 0.50f;
+
+  style.Colors[ImGuiCol_Border] = ImVec4(0.539f, 0.479f, 0.255f, 0.162f);
+  style.FrameBorderSize = 0.0f;
+  style.WindowBorderSize = 1.0f;
 }
 
 void Gui::init() {
@@ -91,14 +153,28 @@ void Gui::init() {
     return reinterpret_cast<glbinding::ProcAddress>(SDL_GL_GetProcAddress(name));
   };
   glbinding::initialize(get_proc_address, false);
-  //  glbinding::setCallbackMaskExcept(glbinding::CallbackMask::Before | glbinding::CallbackMask::After,
-  //                                   { "glGetError" });
+
+  // On Debug builds, check every OpenGL call
+#if !NDEBUG
+  auto gl_after_callback = [](const glbinding::FunctionCall& fn) {
+    for (GLenum error = glGetError(); error != GL_NO_ERROR; error = glGetError()) {
+      std::stringstream gl_error;
+      gl_error << error;
+      LOG_ERROR("OpenGL: {} error {}.", fn.function->name(), gl_error.str());
+      assert(0);
+    }
+  };
+
+  glbinding::setCallbackMaskExcept(glbinding::CallbackMask::After, { "glGetError" });
   glbinding::setAfterCallback(gl_after_callback);
+#endif
 
   // Set-up imgui context
   IMGUI_CHECKVERSION();
   ImGui::CreateContext();
 
+  init_theme();
+
   // Setup platform/renderer bindings
   ImGui_ImplSDL2_InitForOpenGL(m_window, m_gl_context);
   ImGui_ImplOpenGL3_Init("#version 330 core");