Backends: Start adding sdl2 surface

2025-12-24 23:17:37 +03:00
parent 922a11f084
commit f2703c1015
4 changed files with 365 additions and 0 deletions
@@ -0,0 +1,31 @@
+# Makefile for example_sdl2_surface (MinGW)
+
+CXX = g++
+CXXFLAGS = -std=c++17 -Wall -Wformat
+INCLUDES = -I../.. -I../../backends -I/mingw64/include/SDL2
+LIBS = -lmingw32 -lSDL2main -lSDL2 -lgdi32
+
+IMGUI_DIR = ../..
+SOURCES = main.cpp
+SOURCES += $(IMGUI_DIR)/imgui.cpp $(IMGUI_DIR)/imgui_demo.cpp $(IMGUI_DIR)/imgui_draw.cpp $(IMGUI_DIR)/imgui_tables.cpp $(IMGUI_DIR)/imgui_widgets.cpp
+SOURCES += $(IMGUI_DIR)/backends/imgui_impl_sdl2.cpp
+SOURCES += $(IMGUI_DIR)/backends/imgui_impl_sdlsurface2.cpp
+
+OBJS = $(addsuffix .o, $(basename $(notdir $(SOURCES))))
+
+%.o:%.cpp
+	$(CXX) $(CXXFLAGS) $(INCLUDES) -c -o $@ $<
+
+%.o:$(IMGUI_DIR)/%.cpp
+	$(CXX) $(CXXFLAGS) $(INCLUDES) -c -o $@ $<
+
+%.o:$(IMGUI_DIR)/backends/%.cpp
+	$(CXX) $(CXXFLAGS) $(INCLUDES) -c -o $@ $<
+
+all: example_sdl2_surface.exe
+
+example_sdl2_surface.exe: $(OBJS)
+	$(CXX) -o $@ $^ $(LIBS)
+
+clean:
+	del /Q *.o *.exe
@@ -0,0 +1,95 @@
+// main.cpp
+// Example program using imgui_impl_sdlsurface2 backend
+
+#include "imgui.h"
+#include "imgui_impl_sdl2.h"
+#include "imgui_impl_sdlsurface2.h"
+#include <SDL.h>
+#include <stdio.h>
+
+int main(int, char**)
+{
+    if (SDL_Init(SDL_INIT_VIDEO) != 0)
+    {
+        printf("Error: %s\n", SDL_GetError());
+        return -1;
+    }
+
+    SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+Surface Example",
+        SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
+        1280, 720, SDL_WINDOW_SHOWN);
+    if (!window)
+    {
+        printf("Error creating window: %s\n", SDL_GetError());
+        return -1;
+    }
+
+    SDL_Surface* window_surface = SDL_GetWindowSurface(window);
+    if (!window_surface)
+    {
+        printf("Error getting window surface: %s\n", SDL_GetError());
+        return -1;
+    }
+
+    SDL_Surface* framebuffer = SDL_CreateRGBSurfaceWithFormat(0, 1280, 720, 32, SDL_PIXELFORMAT_RGBA32);
+    if (!framebuffer)
+    {
+        printf("Error creating framebuffer: %s\n", SDL_GetError());
+        return -1;
+    }
+
+    IMGUI_CHECKVERSION();
+    ImGui::CreateContext();
+    ImGuiIO& io = ImGui::GetIO(); (void)io;
+
+    ImGui::StyleColorsDark();
+
+    ImGui_ImplSDL2_InitForSDLRenderer(window, nullptr);
+    ImGui_ImplSDLSurface2_Init(framebuffer);
+
+    bool show_demo_window = true;
+    ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
+
+    bool done = false;
+    while (!done)
+    {
+        SDL_Event event;
+        while (SDL_PollEvent(&event))
+        {
+            ImGui_ImplSDL2_ProcessEvent(&event);
+            if (event.type == SDL_QUIT)
+                done = true;
+            if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
+                done = true;
+        }
+
+        ImGui_ImplSDLSurface2_NewFrame();
+        ImGui_ImplSDL2_NewFrame();
+        ImGui::NewFrame();
+
+        if (show_demo_window)
+            ImGui::ShowDemoWindow(&show_demo_window);
+
+        ImGui::Render();
+
+        SDL_FillRect(framebuffer, nullptr, SDL_MapRGB(framebuffer->format,
+            (Uint8)(clear_color.x * 255),
+            (Uint8)(clear_color.y * 255),
+            (Uint8)(clear_color.z * 255)));
+
+        ImGui_ImplSDLSurface2_RenderDrawData(ImGui::GetDrawData());
+
+        SDL_BlitSurface(framebuffer, nullptr, window_surface, nullptr);
+        SDL_UpdateWindowSurface(window);
+    }
+
+    ImGui_ImplSDLSurface2_Shutdown();
+    ImGui_ImplSDL2_Shutdown();
+    ImGui::DestroyContext();
+
+    SDL_FreeSurface(framebuffer);
+    SDL_DestroyWindow(window);
+    SDL_Quit();
+
+    return 0;
+}