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Examples: SDL: Fixed compilation for SDL 2..0.3 and less (running on our test servers) and clarified a bit of the messy situation. Followup to 8dd83c5. (#1542, #2117)
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omar
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@ -42,11 +42,10 @@
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#include "imgui_impl_sdl.h"
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// SDL
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// (the multi-viewports feature requires SDL features supported from SDL 2.0.5+)
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// (the multi-viewports feature requires SDL features supported from SDL 2.0.4+. SDL 2.0.5+ is highly recommended)
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#include <SDL.h>
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#include <SDL_syswm.h>
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#define SDL_HAS_WARP_MOUSE_GLOBAL SDL_VERSION_ATLEAST(2,0,4)
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#define SDL_HAS_CAPTURE_MOUSE SDL_VERSION_ATLEAST(2,0,4)
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#define SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE SDL_VERSION_ATLEAST(2,0,4)
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#define SDL_HAS_WINDOW_ALPHA SDL_VERSION_ATLEAST(2,0,5)
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#define SDL_HAS_ALWAYS_ON_TOP SDL_VERSION_ATLEAST(2,0,5)
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#define SDL_HAS_USABLE_DISPLAY_BOUNDS SDL_VERSION_ATLEAST(2,0,5)
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@ -149,10 +148,7 @@ static bool ImGui_ImplSDL2_Init(SDL_Window* window, void* sdl_gl_context)
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// Setup back-end capabilities flags
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ImGuiIO& io = ImGui::GetIO();
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io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional)
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#if SDL_HAS_WARP_MOUSE_GLOBAL
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io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos; // We can honor io.WantSetMousePos requests (optional, rarely used)
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#endif
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#if SDL_HAS_CAPTURE_MOUSE
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#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE
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io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports; // We can create multi-viewports on the Platform side (optional)
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#endif
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io.BackendPlatformName = "imgui_impl_sdl";
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@ -213,9 +209,9 @@ bool ImGui_ImplSDL2_InitForOpenGL(SDL_Window* window, void* sdl_gl_context)
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bool ImGui_ImplSDL2_InitForVulkan(SDL_Window* window)
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{
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#if !SDL_HAS_VULKAN
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#if !SDL_HAS_VULKAN
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IM_ASSERT(0 && "Unsupported");
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#endif
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#endif
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return ImGui_ImplSDL2_Init(window, NULL);
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}
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@ -235,57 +231,72 @@ void ImGui_ImplSDL2_Shutdown()
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memset(g_MouseCursors, 0, sizeof(g_MouseCursors));
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}
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// This code is incredibly messy because some of the functions we need for full viewport support are not available in SDL < 2.0.4.
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static void ImGui_ImplSDL2_UpdateMousePosAndButtons()
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{
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ImGuiIO& io = ImGui::GetIO();
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io.MouseHoveredViewport = 0;
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// Set OS mouse position if requested (rarely used, only when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user)
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// (When multi-viewports are enabled, all imgui positions are same as OS positions.)
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#if SDL_HAS_WARP_MOUSE_GLOBAL
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if (!io.WantSetMousePos)
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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else if ((io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable) == 0)
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SDL_WarpMouseInWindow(g_Window, (int)io.MousePos.x, (int)io.MousePos.y);
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else
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// [1]
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// Only when requested by io.WantSetMousePos: set OS mouse pos from Dear ImGui mouse pos.
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// (rarely used, mostly when ImGuiConfigFlags_NavEnableSetMousePos is enabled by user)
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if (io.WantSetMousePos)
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{
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#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE
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if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
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SDL_WarpMouseGlobal((int)io.MousePos.x, (int)io.MousePos.y);
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#else
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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else
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#endif
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SDL_WarpMouseInWindow(g_Window, (int)io.MousePos.x, (int)io.MousePos.y);
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}
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else
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{
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io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
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}
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int mouse_x, mouse_y;
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Uint32 mouse_buttons = SDL_GetMouseState(&mouse_x, &mouse_y); // NB: We don't use the x/y results from SDL_GetMouseState()
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SDL_GetGlobalMouseState(&mouse_x, &mouse_y);
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// [2]
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// Set Dear ImGui mouse pos from OS mouse pos + get buttons. (this is the common behavior)
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int mouse_x_local, mouse_y_local;
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Uint32 mouse_buttons = SDL_GetMouseState(&mouse_x_local, &mouse_y_local);
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io.MouseDown[0] = g_MousePressed[0] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_LEFT)) != 0; // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
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io.MouseDown[1] = g_MousePressed[1] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
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io.MouseDown[2] = g_MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
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g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
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#if SDL_HAS_CAPTURE_MOUSE && !defined(__EMSCRIPTEN__)
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#if SDL_HAS_CAPTURE_AND_GLOBAL_MOUSE
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// SDL 2.0.4 and later has SDL_GetGlobalMouseState() and SDL_CaptureMouse()
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int mouse_x_global, mouse_y_global;
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SDL_GetGlobalMouseState(&mouse_x_global, &mouse_y_global);
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#if !defined(__EMSCRIPTEN__)
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if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
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{
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// Multi-viewport mode: mouse position in OS absolute coordinates (io.MousePos is (0,0) when the mouse is on the upper-left of the primary monitor)
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if (SDL_Window* focused_window = SDL_GetKeyboardFocus())
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if (ImGui::FindViewportByPlatformHandle((void*)focused_window) != NULL)
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io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);
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io.MousePos = ImVec2((float)mouse_x_global, (float)mouse_y_global);
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}
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else
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#endif
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{
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// Single viewport mode: mouse position in client window coordinates (io.MousePos is (0,0) when the mouse is on the upper-left corner of the app window)
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// Single-viewport mode: mouse position in client window coordinatesio.MousePos is (0,0) when the mouse is on the upper-left corner of the app window)
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if (SDL_GetWindowFlags(g_Window) & SDL_WINDOW_INPUT_FOCUS)
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{
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int window_x, window_y;
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SDL_GetWindowPosition(g_Window, &window_x, &window_y);
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io.MousePos = ImVec2((float)(mouse_x - window_x), (float)(mouse_y - window_y));
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io.MousePos = ImVec2((float)(mouse_x_global - window_x), (float)(mouse_y_global - window_y));
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}
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}
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// We already retrieve global mouse position, SDL_CaptureMouse() also let the OS know e.g. that our imgui drag outside the SDL window boundaries shouldn't trigger the OS window resize cursor
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// SDL_CaptureMouse() will let the OS know that our drag outside the SDL window boundaries shouldn't trigger the OS window resize cursor.
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// The function is only supported from SDL 2.0.4 (released Jan 2016)
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#if SDL_HAS_CAPTURE_MOUSE
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bool any_mouse_button_down = ImGui::IsAnyMouseDown();
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SDL_CaptureMouse(any_mouse_button_down ? SDL_TRUE : SDL_FALSE);
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#else
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// SDL 2.0.3 and before: single-viewport only
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if (SDL_GetWindowFlags(g_Window) & SDL_WINDOW_INPUT_FOCUS)
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io.MousePos = ImVec2((float)mouse_x_local, (float)mouse_y_local);
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#endif
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}
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