housekeeping and inventory menu

src/gui/canvas.cc

@@ -64,6 +64,7 @@ void Canvas::DrawContextMenu() {
     ImGui::OpenPopupOnItemClick("context", ImGuiPopupFlags_MouseButtonRight);
 
   if (ImGui::BeginPopup("context")) {
+    ImGui::MenuItem("Show Grid", nullptr, &enable_grid_);
     if (ImGui::MenuItem("Reset Position", nullptr, false)) {
       scrolling_.x = 0;
       scrolling_.y = 0;

src/gui/color.cc

@@ -0,0 +1,84 @@
+#include "color.h"
+
+#include <imgui/imgui.h>
+
+#include <cmath>
+#include <string>
+
+#include "app/gfx/bitmap.h"
+#include "app/gfx/snes_palette.h"
+
+namespace yaze {
+namespace gui {
+void DisplayPalette(app::gfx::SNESPalette& palette, bool loaded) {
+  static ImVec4 color = ImVec4(0, 0, 0, 255.f);
+  ImGuiColorEditFlags misc_flags = ImGuiColorEditFlags_AlphaPreview |
+                                   ImGuiColorEditFlags_NoDragDrop |
+                                   ImGuiColorEditFlags_NoOptions;
+
+  // Generate a default palette. The palette will persist and can be edited.
+  static bool init = false;
+  static ImVec4 saved_palette[32] = {};
+  if (loaded && !init) {
+    for (int n = 0; n < palette.size_; n++) {
+      saved_palette[n].x = palette.GetColor(n).rgb.x / 255;
+      saved_palette[n].y = palette.GetColor(n).rgb.y / 255;
+      saved_palette[n].z = palette.GetColor(n).rgb.z / 255;
+      saved_palette[n].w = 255;  // Alpha
+    }
+    init = true;
+  }
+
+  static ImVec4 backup_color;
+  ImGui::Text("Current ==>");
+  ImGui::SameLine();
+  ImGui::Text("Previous");
+
+  ImGui::ColorButton(
+      "##current", color,
+      ImGuiColorEditFlags_NoPicker | ImGuiColorEditFlags_AlphaPreviewHalf,
+      ImVec2(60, 40));
+  ImGui::SameLine();
+
+  if (ImGui::ColorButton(
+          "##previous", backup_color,
+          ImGuiColorEditFlags_NoPicker | ImGuiColorEditFlags_AlphaPreviewHalf,
+          ImVec2(60, 40)))
+    color = backup_color;
+  ImGui::Separator();
+
+ImGui::BeginGroup();  // Lock X position
+  ImGui::Text("Palette");
+  for (int n = 0; n < IM_ARRAYSIZE(saved_palette); n++) {
+    ImGui::PushID(n);
+    if ((n % 4) != 0) ImGui::SameLine(0.0f, ImGui::GetStyle().ItemSpacing.y);
+
+    ImGuiColorEditFlags palette_button_flags = ImGuiColorEditFlags_NoAlpha |
+                                               ImGuiColorEditFlags_NoPicker |
+                                               ImGuiColorEditFlags_NoTooltip;
+    if (ImGui::ColorButton("##palette", saved_palette[n], palette_button_flags,
+                           ImVec2(20, 20)))
+      color = ImVec4(saved_palette[n].x, saved_palette[n].y, saved_palette[n].z,
+                     color.w);  // Preserve alpha!
+
+    if (ImGui::BeginDragDropTarget()) {
+      if (const ImGuiPayload* payload =
+              ImGui::AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_3F))
+        memcpy((float*)&saved_palette[n], payload->Data, sizeof(float) * 3);
+      if (const ImGuiPayload* payload =
+              ImGui::AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_4F))
+        memcpy((float*)&saved_palette[n], payload->Data, sizeof(float) * 4);
+      ImGui::EndDragDropTarget();
+    }
+
+    ImGui::PopID();
+  }
+  ImGui::EndGroup();
+  ImGui::SameLine();
+
+  ImGui::ColorPicker4("##picker", (float*)&color,
+                      misc_flags | ImGuiColorEditFlags_NoSidePreview |
+                          ImGuiColorEditFlags_NoSmallPreview);
+}
+}  // namespace gui
+}  // namespace yaze

src/gui/color.h

@@ -0,0 +1,20 @@
+#ifndef YAZE_GUI_COLOR_H
+#define YAZE_GUI_COLOR_H
+
+#include <imgui/imgui.h>
+
+#include <cmath>
+#include <string>
+
+#include "app/gfx/bitmap.h"
+#include "app/gfx/snes_palette.h"
+
+namespace yaze {
+namespace gui {
+
+void DisplayPalette(app::gfx::SNESPalette& palette, bool loaded);
+
+}  // namespace gui
+}  // namespace yaze
+
+#endif