From fb2bafb215ae6f5e51de73ca9c77c3f2bf02bf9b Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Wed, 23 Aug 2023 13:12:28 +0800
Subject: [PATCH] image display, two columns

---
 main.cpp | 56 +++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 49 insertions(+), 7 deletions(-)

diff --git a/main.cpp b/main.cpp
index 739f12c..6fc7acd 100644
--- a/main.cpp
+++ b/main.cpp
@@ -10,7 +10,7 @@ int main(int, char**)
         return 1;
     glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
-    GLFWwindow* window = glfwCreateWindow(1280, 720, "microsa", nullptr, nullptr);
+    GLFWwindow* window = glfwCreateWindow(1900, 720, "microsa", nullptr, nullptr);
     if (window == nullptr) {
         glfwTerminate();
         return 1;
@@ -18,29 +18,71 @@ int main(int, char**)
     glfwMakeContextCurrent(window);
     glfwSwapInterval(1);
 
+    IMGUI_CHECKVERSION();
     ImGui::CreateContext();
-    ImGuiIO& io = ImGui::GetIO(); (void)io;
+    ImGuiIO& io = ImGui::GetIO();
     io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
     ImGui::StyleColorsDark();
     ImGui_ImplGlfw_InitForOpenGL(window, true);
     ImGui_ImplOpenGL3_Init("#version 130");
 
-    ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
-    while (!glfwWindowShouldClose(window)) {
+    int waterfall_width = 1600;
+    int waterfall_height = 700;
+    unsigned int waterfall_data[1600*700];
+    GLuint waterfall;
+    glGenTextures(1, &waterfall);
+    glBindTexture(GL_TEXTURE_2D, waterfall);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+    int t = 0;
+    bool exit = false;
+    while (!exit && !glfwWindowShouldClose(window)) {
         glfwPollEvents();
+        glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
+        glClear(GL_COLOR_BUFFER_BIT);
+
+        t++;
+        for(int y=0;y<waterfall_height;y++)
+            for(int x=0;x<waterfall_width;x++)
+                waterfall_data[y*waterfall_width+x] = (x+y+t) | 0xff000000;
+
+        glBindTexture(GL_TEXTURE_2D, waterfall);
+        #if defined(GL_UNPACK_ROW_LENGTH) && !defined(__EMSCRIPTEN__)
+        glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+        #endif
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, waterfall_width, waterfall_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, waterfall_data);
 
         ImGui_ImplOpenGL3_NewFrame();
         ImGui_ImplGlfw_NewFrame();
         ImGui::NewFrame();
 
+        ImGui::SetNextWindowPos(ImVec2(0.0f, 0.0f));
+        ImGui::SetNextWindowSize(io.DisplaySize);
+        ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
+        ImGui::Begin("microsa", nullptr, ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoResize);
+
+        ImGui::BeginTable("microsa", 2, ImGuiTableFlags_SizingStretchSame | ImGuiTableFlags_Resizable);
+        ImGui::TableSetupColumn("", 0, 280.0);
+        ImGui::TableSetupColumn("", 0, 1600.0);
+        ImGui::TableNextColumn();
+        if(ImGui::Button("Exit"))
+            exit = true;
+        ImGui::TableNextColumn();
+        ImGui::Image((void*)(intptr_t)waterfall, ImVec2(waterfall_width, waterfall_height));
+        ImGui::EndTable();
+
+        ImGui::End();
+        ImGui::PopStyleVar(1);
+
         // Rendering
         ImGui::Render();
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
         int display_w, display_h;
         glfwGetFramebufferSize(window, &display_w, &display_h);
         glViewport(0, 0, display_w, display_h);
-        glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
-        glClear(GL_COLOR_BUFFER_BIT);
-        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
         glfwSwapBuffers(window);
     }