From 734d37bb046e51404cb094cda66d8274694fe086 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Fri, 16 Jul 2021 19:28:25 +0200
Subject: Put together a stub of the viewer

---
 .gitignore   |   5 +++
 Makefile     |  15 +++++++
 markdown.cpp | 126 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 146 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 markdown.cpp

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9542e0a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+*.o
+*.a
+*.so*
+markdown
+imgui.ini
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..9f647f5
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,15 @@
+CXXFLAGS+=-Wall -Wpedantic -Wextra
+CXXFLAGS+=$(shell pkg-config --cflags gl glfw3 glew)
+CXXFLAGS+=-I$(HOME)/repos/imgui
+CXXFLAGS+=-I$(HOME)/repos/imgui/backends
+CXXFLAGS+=-I$(HOME)/repos/imgui_md
+LDLIBS+=-L$(HOME)/repos/imgui_md -l:libimgui_md.a
+LDLIBS+=$(shell pkg-config --libs gl glfw3 glew md4c)
+LDLIBS+=-lstdc++ -lm
+
+markdown: markdown.o imgui.o imgui_draw.o imgui_widgets.o imgui_demo.o imgui_impl_opengl3.o imgui_impl_glfw.o imgui_tables.o
+
+clean:
+	rm -f *.o
+
+.PHONY: clean
diff --git a/markdown.cpp b/markdown.cpp
new file mode 100644
index 0000000..a7c1312
--- /dev/null
+++ b/markdown.cpp
@@ -0,0 +1,126 @@
+#include <stdio.h>
+
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+
+#include <imgui.h>
+#include <imgui_impl_glfw.h>
+#include <imgui_impl_opengl3.h>
+#include <imgui_md.h>
+
+ImFont * g_font_regular;
+ImFont * g_font_bold;
+ImFont * g_font_bold_large;
+
+struct Markdown : public imgui_md
+{
+	ImFont * get_font() const override
+	{
+		if (m_is_table_header)
+		{
+			return g_font_bold;
+		}
+		switch (m_hlevel)
+		{
+		case 0:
+			return m_is_strong ? g_font_bold : g_font_regular;
+		case 1:
+			return g_font_bold_large;
+		default:
+			return g_font_bold;
+		}
+	}
+};
+
+static void glfw_error_callback(int error, const char * description)
+{
+	fprintf(stderr, "glfw (%d): %s\n", error, description);
+}
+
+static void markdown(const char * str, const char * str_end)
+{
+	static Markdown s_printer;
+	s_printer.print(str, str_end);
+}
+
+ImVec2 g_window_size;
+
+static void resized(GLFWwindow *, int width, int height)
+{
+	g_window_size.x = static_cast<float>(width);
+	g_window_size.y = static_cast<float>(height);
+}
+
+int main(int, char **)
+{
+	glfwSetErrorCallback(glfw_error_callback);
+	if (!glfwInit())
+		return 1;
+
+	const char * glsl_version = "#version 130";
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+
+	GLFWwindow * window = glfwCreateWindow(1280, 720, "Markdown", nullptr, nullptr);
+	if (nullptr == window)
+		return 1;
+	glfwMakeContextCurrent(window);
+	glfwSwapInterval(1);
+	glfwSetWindowSizeCallback(window, resized);
+
+	if (GLEW_OK != glewInit())
+		return 1;
+
+	IMGUI_CHECKVERSION();
+	ImGui::CreateContext();
+	ImGuiIO & io = ImGui::GetIO();
+	io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
+	io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+	g_font_regular = io.Fonts->AddFontFromFileTTF("OpenSans-Regular.ttf", 18);
+	g_font_bold = io.Fonts->AddFontFromFileTTF("OpenSans-Bold.ttf", 18);
+	g_font_bold_large = io.Fonts->AddFontFromFileTTF("OpenSans-Bold.ttf", 26);
+
+	ImGui::StyleColorsDark();
+	ImGui_ImplGlfw_InitForOpenGL(window, true);
+	ImGui_ImplOpenGL3_Init(glsl_version);
+
+	while (!glfwWindowShouldClose(window))
+	{
+		glfwPollEvents();
+		ImGui_ImplOpenGL3_NewFrame();
+		ImGui_ImplGlfw_NewFrame();
+		ImGui::NewFrame();
+
+		ImGui::SetNextWindowPos({0, 0});
+		ImGui::SetNextWindowSize(g_window_size);
+		ImGui::Begin(
+			"Markdown",
+			nullptr,
+			ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoBackground | ImGuiWindowFlags_NoSavedSettings
+		);
+		static const char * text =
+			"# Hello world!\n" // 15
+			"Lorem ipsum dolor\n" // 18 33
+			" * sit\n" // 7 40
+			" * amet\n"; // 8 48
+		markdown(text, text + 48);
+		ImGui::End();
+
+		ImGui::Render();
+		int display_w, display_h;
+		glfwGetFramebufferSize(window, &display_w, &display_h);
+		glViewport(0, 0, display_w, display_h);
+		glClearColor(0, 0, 0, 0);
+		glClear(GL_COLOR_BUFFER_BIT);
+		ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+		glfwSwapBuffers(window);
+	}
+
+	ImGui_ImplOpenGL3_Shutdown();
+	ImGui_ImplGlfw_Shutdown();
+	ImGui::DestroyContext();
+
+	glfwDestroyWindow(window);
+	glfwTerminate();
+}
-- 
cgit v1.1