initial commit

* combine all source files into this monorepo

* convert all third-party source packages into submodules

* small fixes due to changes in latest third-part packages

1 files changed, 151 insertions, 0 deletions

diff --git a/gui/source/gui.cpp b/gui/source/gui.cpp
new file mode 100644
index 0000000..45bdf66
--- /dev/null
+++ b/gui/source/gui.cpp
@@ -0,0 +1,151 @@
+/**
+ * @file gui.cpp
+ * @brief Contains code for GUI-related logic.
+ *
+ * Copyright (C) 2021 Clyne Sullivan
+ *
+ * Distributed under the GNU GPL v3 or later. You should have received a copy of
+ * the GNU General Public License along with this program.
+ * If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "imgui.h"
+#include "imgui_internal.h"
+#include "backends/imgui_impl_sdl2.h"
+#include "backends/imgui_impl_opengl2.h"
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_opengl.h>
+
+bool guiInitialize();
+void guiRender();
+bool guiHandleEvents();
+void guiShutdown();
+
+static SDL_Window *window = nullptr;
+static SDL_GLContext gl_context;
+
+bool guiInitialize()
+{
+    if (SDL_Init(0) != 0) {
+        printf("Error: %s\n", SDL_GetError());
+        return false;
+    }
+
+    // Setup window
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
+    SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
+    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
+    window = SDL_CreateWindow("stmdsp gui",
+        SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+        640, 700,
+        SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE /*| SDL_WINDOW_ALLOW_HIGHDPI*/);
+
+    if (window == nullptr) {
+        puts("Error: Could not create the window!");
+        return false;
+    }
+
+    SDL_SetWindowMinimumSize(window, 320, 320);
+
+    gl_context = SDL_GL_CreateContext(window);
+    SDL_GL_MakeCurrent(window, gl_context);
+    SDL_GL_SetSwapInterval(1); // Enable vsync
+
+    // Setup Dear ImGui context
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    //io->ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+
+    ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
+    ImGui_ImplOpenGL2_Init();
+
+    ImGui::StyleColorsLight();
+    ImGuiStyle& style = ImGui::GetStyle();
+    style.WindowRounding = 5;
+    style.FrameRounding = 3;
+    style.ScrollbarRounding = 1;
+
+//#define ACCENT1 0.26f, 0.59f, 0.98f
+#define ACCENT1 0.6f, 0.6f, 0.6f
+#define ACCENT2 0.4f, 0.4f, 0.4f
+
+    style.Colors[ImGuiCol_FrameBgHovered]         = ImVec4(ACCENT1, 0.40f);
+    style.Colors[ImGuiCol_FrameBgActive]          = ImVec4(ACCENT1, 0.67f);
+    style.Colors[ImGuiCol_CheckMark]              = ImVec4(ACCENT1, 1.00f);
+    style.Colors[ImGuiCol_SliderGrab]             = ImVec4(ACCENT1, 0.78f);
+    style.Colors[ImGuiCol_SliderGrabActive]       = ImVec4(0.46f, 0.54f, 0.80f, 0.60f);
+    style.Colors[ImGuiCol_Button]                 = ImVec4(ACCENT1, 0.40f);
+    style.Colors[ImGuiCol_ButtonHovered]          = ImVec4(ACCENT1, 1.00f);
+    style.Colors[ImGuiCol_ButtonActive]           = ImVec4(ACCENT2, 1.00f);
+    style.Colors[ImGuiCol_Header]                 = ImVec4(ACCENT1, 0.31f);
+    style.Colors[ImGuiCol_HeaderHovered]          = ImVec4(ACCENT1, 0.80f);
+    style.Colors[ImGuiCol_HeaderActive]           = ImVec4(ACCENT1, 1.00f);
+    style.Colors[ImGuiCol_Separator]              = ImVec4(0.39f, 0.39f, 0.39f, 0.62f);
+    style.Colors[ImGuiCol_SeparatorHovered]       = ImVec4(0.14f, 0.44f, 0.80f, 0.78f);
+    style.Colors[ImGuiCol_SeparatorActive]        = ImVec4(0.14f, 0.44f, 0.80f, 1.00f);
+    style.Colors[ImGuiCol_ResizeGripHovered]      = ImVec4(ACCENT1, 0.67f);
+    style.Colors[ImGuiCol_ResizeGripActive]       = ImVec4(ACCENT1, 0.95f);
+    style.Colors[ImGuiCol_TableHeaderBg]          = ImVec4(0.78f, 0.87f, 0.98f, 1.00f);
+    style.Colors[ImGuiCol_TableBorderStrong]      = ImVec4(0.57f, 0.57f, 0.64f, 1.00f);
+    style.Colors[ImGuiCol_TableBorderLight]       = ImVec4(0.68f, 0.68f, 0.74f, 1.00f);
+    style.Colors[ImGuiCol_TextSelectedBg]         = ImVec4(ACCENT1, 0.35f);
+    style.Colors[ImGuiCol_DragDropTarget]         = ImVec4(ACCENT1, 0.95f);
+
+    style.Colors[ImGuiCol_Tab]                    = ImLerp(style.Colors[ImGuiCol_Header],       style.Colors[ImGuiCol_TitleBgActive], 0.90f);
+    style.Colors[ImGuiCol_TabHovered]             = style.Colors[ImGuiCol_HeaderHovered];
+    style.Colors[ImGuiCol_TabActive]              = ImLerp(style.Colors[ImGuiCol_HeaderActive], style.Colors[ImGuiCol_TitleBgActive], 0.60f);
+    style.Colors[ImGuiCol_TabUnfocused]           = ImLerp(style.Colors[ImGuiCol_Tab],          style.Colors[ImGuiCol_TitleBg], 0.80f);
+    style.Colors[ImGuiCol_TabUnfocusedActive]     = ImLerp(style.Colors[ImGuiCol_TabActive],    style.Colors[ImGuiCol_TitleBg], 0.40f);
+    style.Colors[ImGuiCol_NavHighlight]           = style.Colors[ImGuiCol_HeaderHovered];
+
+    return true;
+}
+
+void guiRender()
+{
+    ImGui::Render();
+
+    const auto& displaySize = ImGui::GetIO().DisplaySize;
+    const int sizeX = static_cast<int>(displaySize.x);
+    const int sizeY = static_cast<int>(displaySize.y);
+
+    glViewport(0, 0, sizeX, sizeY);
+    glClearColor(1, 1, 1, 1);
+    glClear(GL_COLOR_BUFFER_BIT);
+    ImGui_ImplOpenGL2_RenderDrawData(ImGui::GetDrawData());
+    SDL_GL_SwapWindow(window);
+}
+
+bool guiHandleEvents()
+{
+    bool done = false;
+
+    for (SDL_Event event; SDL_PollEvent(&event);) {
+        ImGui_ImplSDL2_ProcessEvent(&event);
+        if (event.type == SDL_QUIT) {
+            done = true;
+        } else if (event.type == SDL_WINDOWEVENT) {
+            const auto& ew = event.window;
+            const auto wid = SDL_GetWindowID(window);
+            if (ew.event == SDL_WINDOWEVENT_CLOSE && ew.windowID == wid)
+                done = true;
+        }
+    }
+
+    return done;
+}
+
+void guiShutdown()
+{
+    ImGui_ImplOpenGL2_Shutdown();
+    ImGui_ImplSDL2_Shutdown();
+    ImGui::DestroyContext();
+
+    SDL_GL_DeleteContext(gl_context);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+}
+