| // ImGui SDL2 binding with OpenGL3 |
| // (SDL is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.) |
| // (GL3W is a helper library to access OpenGL functions since there is no standard header to access modern OpenGL functions easily. Alternatives are GLEW, Glad, etc.) |
| |
| // Implemented features: |
| // [X] User texture binding. Cast 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID in imgui.cpp. |
| // Missing features: |
| // [ ] SDL2 handling of IME under Windows appears to be broken and it explicitly disable the regular Windows IME. You can restore Windows IME by compiling SDL with SDL_DISABLE_WINDOWS_IME. |
| |
| // You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this. |
| // If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown(). |
| // If you are new to ImGui, see examples/README.txt and documentation at the top of imgui.cpp. |
| // https://github.com/ocornut/imgui |
| |
| // CHANGELOG |
| // (minor and older changes stripped away, please see git history for details) |
| // 2018-05-09: Misc: Fixed clipboard paste memory leak (we didn't call SDL_FreeMemory on the data returned by SDL_GetClipboardText). |
| // 2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag. |
| // 2018-03-06: OpenGL: Added const char* glsl_version parameter to ImGui_ImplSdlGL3_Init() so user can override the GLSL version e.g. "#version 150". |
| // 2018-02-23: OpenGL: Create the VAO in the render function so the setup can more easily be used with multiple shared GL context. |
| // 2018-02-16: Inputs: Added support for mouse cursors, honoring ImGui::GetMouseCursor() value. |
| // 2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplSdlGL3_RenderDrawData() in the .h file so you can call it yourself. |
| // 2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves. |
| // 2018-02-06: Inputs: Added mapping for ImGuiKey_Space. |
| // 2018-02-05: Misc: Using SDL_GetPerformanceCounter() instead of SDL_GetTicks() to be able to handle very high framerate (1000+ FPS). |
| // 2018-02-05: Inputs: Keyboard mapping is using scancodes everywhere instead of a confusing mixture of keycodes and scancodes. |
| // 2018-01-20: Inputs: Added Horizontal Mouse Wheel support. |
| // 2018-01-19: Inputs: When available (SDL 2.0.4+) using SDL_CaptureMouse() to retrieve coordinates outside of client area when dragging. Otherwise (SDL 2.0.3 and before) testing for SDL_WINDOW_INPUT_FOCUS instead of SDL_WINDOW_MOUSE_FOCUS. |
| // 2018-01-18: Inputs: Added mapping for ImGuiKey_Insert. |
| // 2018-01-07: OpenGL: Changed GLSL shader version from 330 to 150. |
| // 2017-09-01: OpenGL: Save and restore current bound sampler. Save and restore current polygon mode. |
| // 2017-08-25: Inputs: MousePos set to -FLT_MAX,-FLT_MAX when mouse is unavailable/missing (instead of -1,-1). |
| // 2017-05-01: OpenGL: Fixed save and restore of current blend func state. |
| // 2017-05-01: OpenGL: Fixed save and restore of current GL_ACTIVE_TEXTURE. |
| // 2016-10-15: Misc: Added a void* user_data parameter to Clipboard function handlers. |
| // 2016-09-05: OpenGL: Fixed save and restore of current scissor rectangle. |
| // 2016-07-29: OpenGL: Explicitly setting GL_UNPACK_ROW_LENGTH to reduce issues because SDL changes it. (#752) |
| |
| #if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS) |
| #define _CRT_SECURE_NO_WARNINGS |
| #endif |
| |
| #include "imgui.h" |
| #include "imgui_impl_sdl_gl3.h" |
| |
| // SDL,GL3W |
| #include <SDL.h> |
| #include <SDL_syswm.h> |
| #include <GL/gl3w.h> // This example is using gl3w to access OpenGL functions (because it is small). You may use glew/glad/glLoadGen/etc. whatever already works for you. |
| |
| // SDL data |
| static Uint64 g_Time = 0; |
| static bool g_MousePressed[3] = { false, false, false }; |
| static SDL_Cursor* g_MouseCursors[ImGuiMouseCursor_COUNT] = { 0 }; |
| static char* g_ClipboardTextData = NULL; |
| |
| // OpenGL data |
| static char g_GlslVersion[32] = "#version 150"; |
| static GLuint g_FontTexture = 0; |
| static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; |
| static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; |
| static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0; |
| static unsigned int g_VboHandle = 0,g_ElementsHandle = 0; |
| |
| // This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure) |
| // Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly, in order to be able to run within any OpenGL engine that doesn't do so. |
| // If text or lines are blurry when integrating ImGui in your engine: in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f) |
| void ImGui_ImplSdlGL3_RenderDrawData(ImDrawData* draw_data) |
| { |
| // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates) |
| ImGuiIO& io = ImGui::GetIO(); |
| int fb_width = (int)(io.DisplaySize.x * io.DisplayFramebufferScale.x); |
| int fb_height = (int)(io.DisplaySize.y * io.DisplayFramebufferScale.y); |
| if (fb_width == 0 || fb_height == 0) |
| return; |
| draw_data->ScaleClipRects(io.DisplayFramebufferScale); |
| |
| // Backup GL state |
| GLenum last_active_texture; glGetIntegerv(GL_ACTIVE_TEXTURE, (GLint*)&last_active_texture); |
| glActiveTexture(GL_TEXTURE0); |
| GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program); |
| GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); |
| GLint last_sampler; glGetIntegerv(GL_SAMPLER_BINDING, &last_sampler); |
| GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); |
| GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer); |
| GLint last_vertex_array; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); |
| GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode); |
| GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport); |
| GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box); |
| GLenum last_blend_src_rgb; glGetIntegerv(GL_BLEND_SRC_RGB, (GLint*)&last_blend_src_rgb); |
| GLenum last_blend_dst_rgb; glGetIntegerv(GL_BLEND_DST_RGB, (GLint*)&last_blend_dst_rgb); |
| GLenum last_blend_src_alpha; glGetIntegerv(GL_BLEND_SRC_ALPHA, (GLint*)&last_blend_src_alpha); |
| GLenum last_blend_dst_alpha; glGetIntegerv(GL_BLEND_DST_ALPHA, (GLint*)&last_blend_dst_alpha); |
| GLenum last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, (GLint*)&last_blend_equation_rgb); |
| GLenum last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, (GLint*)&last_blend_equation_alpha); |
| GLboolean last_enable_blend = glIsEnabled(GL_BLEND); |
| GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE); |
| GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST); |
| GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); |
| |
| // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, polygon fill |
| glEnable(GL_BLEND); |
| glBlendEquation(GL_FUNC_ADD); |
| glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
| glDisable(GL_CULL_FACE); |
| glDisable(GL_DEPTH_TEST); |
| glEnable(GL_SCISSOR_TEST); |
| glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); |
| |
| // Setup viewport, orthographic projection matrix |
| glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height); |
| const float ortho_projection[4][4] = |
| { |
| { 2.0f/io.DisplaySize.x, 0.0f, 0.0f, 0.0f }, |
| { 0.0f, 2.0f/-io.DisplaySize.y, 0.0f, 0.0f }, |
| { 0.0f, 0.0f, -1.0f, 0.0f }, |
| {-1.0f, 1.0f, 0.0f, 1.0f }, |
| }; |
| glUseProgram(g_ShaderHandle); |
| glUniform1i(g_AttribLocationTex, 0); |
| glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); |
| glBindSampler(0, 0); // Rely on combined texture/sampler state. |
| |
| // Recreate the VAO every time |
| // (This is to easily allow multiple GL contexts. VAO are not shared among GL contexts, and we don't track creation/deletion of windows so we don't have an obvious key to use to cache them.) |
| GLuint vao_handle = 0; |
| glGenVertexArrays(1, &vao_handle); |
| glBindVertexArray(vao_handle); |
| glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); |
| glEnableVertexAttribArray(g_AttribLocationPosition); |
| glEnableVertexAttribArray(g_AttribLocationUV); |
| glEnableVertexAttribArray(g_AttribLocationColor); |
| glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, pos)); |
| glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, uv)); |
| glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, col)); |
| |
| // Draw |
| for (int n = 0; n < draw_data->CmdListsCount; n++) |
| { |
| const ImDrawList* cmd_list = draw_data->CmdLists[n]; |
| const ImDrawIdx* idx_buffer_offset = 0; |
| |
| glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); |
| glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.Size * sizeof(ImDrawVert), (const GLvoid*)cmd_list->VtxBuffer.Data, GL_STREAM_DRAW); |
| |
| glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); |
| glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.Size * sizeof(ImDrawIdx), (const GLvoid*)cmd_list->IdxBuffer.Data, GL_STREAM_DRAW); |
| |
| for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++) |
| { |
| const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i]; |
| if (pcmd->UserCallback) |
| { |
| pcmd->UserCallback(cmd_list, pcmd); |
| } |
| else |
| { |
| glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); |
| glScissor((int)pcmd->ClipRect.x, (int)(fb_height - pcmd->ClipRect.w), (int)(pcmd->ClipRect.z - pcmd->ClipRect.x), (int)(pcmd->ClipRect.w - pcmd->ClipRect.y)); |
| glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, idx_buffer_offset); |
| } |
| idx_buffer_offset += pcmd->ElemCount; |
| } |
| } |
| glDeleteVertexArrays(1, &vao_handle); |
| |
| // Restore modified GL state |
| glUseProgram(last_program); |
| glBindTexture(GL_TEXTURE_2D, last_texture); |
| glBindSampler(0, last_sampler); |
| glActiveTexture(last_active_texture); |
| glBindVertexArray(last_vertex_array); |
| glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); |
| glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer); |
| glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha); |
| glBlendFuncSeparate(last_blend_src_rgb, last_blend_dst_rgb, last_blend_src_alpha, last_blend_dst_alpha); |
| if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND); |
| if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE); |
| if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST); |
| if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); |
| glPolygonMode(GL_FRONT_AND_BACK, (GLenum)last_polygon_mode[0]); |
| glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]); |
| glScissor(last_scissor_box[0], last_scissor_box[1], (GLsizei)last_scissor_box[2], (GLsizei)last_scissor_box[3]); |
| } |
| |
| static const char* ImGui_ImplSdlGL3_GetClipboardText(void*) |
| { |
| if (g_ClipboardTextData) |
| SDL_free(g_ClipboardTextData); |
| g_ClipboardTextData = SDL_GetClipboardText(); |
| return g_ClipboardTextData; |
| } |
| |
| static void ImGui_ImplSdlGL3_SetClipboardText(void*, const char* text) |
| { |
| SDL_SetClipboardText(text); |
| } |
| |
| // You can read the io.WantCaptureMouse, io.WantCaptureKeyboard flags to tell if dear imgui wants to use your inputs. |
| // - When io.WantCaptureMouse is true, do not dispatch mouse input data to your main application. |
| // - When io.WantCaptureKeyboard is true, do not dispatch keyboard input data to your main application. |
| // Generally you may always pass all inputs to dear imgui, and hide them from your application based on those two flags. |
| bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event) |
| { |
| ImGuiIO& io = ImGui::GetIO(); |
| switch (event->type) |
| { |
| case SDL_MOUSEWHEEL: |
| { |
| if (event->wheel.x > 0) io.MouseWheelH += 1; |
| if (event->wheel.x < 0) io.MouseWheelH -= 1; |
| if (event->wheel.y > 0) io.MouseWheel += 1; |
| if (event->wheel.y < 0) io.MouseWheel -= 1; |
| return true; |
| } |
| case SDL_MOUSEBUTTONDOWN: |
| { |
| if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true; |
| if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true; |
| if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true; |
| return true; |
| } |
| case SDL_TEXTINPUT: |
| { |
| io.AddInputCharactersUTF8(event->text.text); |
| return true; |
| } |
| case SDL_KEYDOWN: |
| case SDL_KEYUP: |
| { |
| int key = event->key.keysym.scancode; |
| IM_ASSERT(key >= 0 && key < IM_ARRAYSIZE(io.KeysDown)); |
| io.KeysDown[key] = (event->type == SDL_KEYDOWN); |
| io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0); |
| io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0); |
| io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0); |
| io.KeySuper = ((SDL_GetModState() & KMOD_GUI) != 0); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| void ImGui_ImplSdlGL3_CreateFontsTexture() |
| { |
| // Build texture atlas |
| ImGuiIO& io = ImGui::GetIO(); |
| unsigned char* pixels; |
| int width, height; |
| io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bits for OpenGL3 demo because it is more likely to be compatible with user's existing shader. |
| |
| // Upload texture to graphics system |
| GLint last_texture; |
| glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); |
| glGenTextures(1, &g_FontTexture); |
| glBindTexture(GL_TEXTURE_2D, g_FontTexture); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
| glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); |
| glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); |
| glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); |
| |
| // Store our identifier |
| io.Fonts->TexID = (void *)(intptr_t)g_FontTexture; |
| |
| // Restore state |
| glBindTexture(GL_TEXTURE_2D, last_texture); |
| } |
| |
| bool ImGui_ImplSdlGL3_CreateDeviceObjects() |
| { |
| // Backup GL state |
| GLint last_texture, last_array_buffer, last_vertex_array; |
| glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); |
| glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); |
| glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); |
| |
| const GLchar *vertex_shader = |
| "uniform mat4 ProjMtx;\n" |
| "in vec2 Position;\n" |
| "in vec2 UV;\n" |
| "in vec4 Color;\n" |
| "out vec2 Frag_UV;\n" |
| "out vec4 Frag_Color;\n" |
| "void main()\n" |
| "{\n" |
| " Frag_UV = UV;\n" |
| " Frag_Color = Color;\n" |
| " gl_Position = ProjMtx * vec4(Position.xy,0,1);\n" |
| "}\n"; |
| |
| const GLchar* fragment_shader = |
| "uniform sampler2D Texture;\n" |
| "in vec2 Frag_UV;\n" |
| "in vec4 Frag_Color;\n" |
| "out vec4 Out_Color;\n" |
| "void main()\n" |
| "{\n" |
| " Out_Color = Frag_Color * texture( Texture, Frag_UV.st);\n" |
| "}\n"; |
| |
| const GLchar* vertex_shader_with_version[2] = { g_GlslVersion, vertex_shader }; |
| const GLchar* fragment_shader_with_version[2] = { g_GlslVersion, fragment_shader }; |
| |
| g_ShaderHandle = glCreateProgram(); |
| g_VertHandle = glCreateShader(GL_VERTEX_SHADER); |
| g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); |
| glShaderSource(g_VertHandle, 2, vertex_shader_with_version, NULL); |
| glShaderSource(g_FragHandle, 2, fragment_shader_with_version, NULL); |
| glCompileShader(g_VertHandle); |
| glCompileShader(g_FragHandle); |
| glAttachShader(g_ShaderHandle, g_VertHandle); |
| glAttachShader(g_ShaderHandle, g_FragHandle); |
| glLinkProgram(g_ShaderHandle); |
| |
| g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); |
| g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); |
| g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position"); |
| g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV"); |
| g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color"); |
| |
| glGenBuffers(1, &g_VboHandle); |
| glGenBuffers(1, &g_ElementsHandle); |
| |
| ImGui_ImplSdlGL3_CreateFontsTexture(); |
| |
| // Restore modified GL state |
| glBindTexture(GL_TEXTURE_2D, last_texture); |
| glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); |
| glBindVertexArray(last_vertex_array); |
| |
| return true; |
| } |
| |
| void ImGui_ImplSdlGL3_InvalidateDeviceObjects() |
| { |
| if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); |
| if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); |
| g_VboHandle = g_ElementsHandle = 0; |
| |
| if (g_ShaderHandle && g_VertHandle) glDetachShader(g_ShaderHandle, g_VertHandle); |
| if (g_VertHandle) glDeleteShader(g_VertHandle); |
| g_VertHandle = 0; |
| |
| if (g_ShaderHandle && g_FragHandle) glDetachShader(g_ShaderHandle, g_FragHandle); |
| if (g_FragHandle) glDeleteShader(g_FragHandle); |
| g_FragHandle = 0; |
| |
| if (g_ShaderHandle) glDeleteProgram(g_ShaderHandle); |
| g_ShaderHandle = 0; |
| |
| if (g_FontTexture) |
| { |
| glDeleteTextures(1, &g_FontTexture); |
| ImGui::GetIO().Fonts->TexID = 0; |
| g_FontTexture = 0; |
| } |
| } |
| |
| bool ImGui_ImplSdlGL3_Init(SDL_Window* window, const char* glsl_version) |
| { |
| // Store GL version string so we can refer to it later in case we recreate shaders. |
| if (glsl_version == NULL) |
| glsl_version = "#version 150"; |
| IM_ASSERT((int)strlen(glsl_version) + 2 < IM_ARRAYSIZE(g_GlslVersion)); |
| strcpy(g_GlslVersion, glsl_version); |
| strcat(g_GlslVersion, "\n"); |
| |
| // Setup back-end capabilities flags |
| ImGuiIO& io = ImGui::GetIO(); |
| io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors; // We can honor GetMouseCursor() values (optional) |
| |
| // Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array. |
| io.KeyMap[ImGuiKey_Tab] = SDL_SCANCODE_TAB; |
| io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT; |
| io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT; |
| io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP; |
| io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN; |
| io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP; |
| io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN; |
| io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME; |
| io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END; |
| io.KeyMap[ImGuiKey_Insert] = SDL_SCANCODE_INSERT; |
| io.KeyMap[ImGuiKey_Delete] = SDL_SCANCODE_DELETE; |
| io.KeyMap[ImGuiKey_Backspace] = SDL_SCANCODE_BACKSPACE; |
| io.KeyMap[ImGuiKey_Space] = SDL_SCANCODE_SPACE; |
| io.KeyMap[ImGuiKey_Enter] = SDL_SCANCODE_RETURN; |
| io.KeyMap[ImGuiKey_Escape] = SDL_SCANCODE_ESCAPE; |
| io.KeyMap[ImGuiKey_A] = SDL_SCANCODE_A; |
| io.KeyMap[ImGuiKey_C] = SDL_SCANCODE_C; |
| io.KeyMap[ImGuiKey_V] = SDL_SCANCODE_V; |
| io.KeyMap[ImGuiKey_X] = SDL_SCANCODE_X; |
| io.KeyMap[ImGuiKey_Y] = SDL_SCANCODE_Y; |
| io.KeyMap[ImGuiKey_Z] = SDL_SCANCODE_Z; |
| |
| io.SetClipboardTextFn = ImGui_ImplSdlGL3_SetClipboardText; |
| io.GetClipboardTextFn = ImGui_ImplSdlGL3_GetClipboardText; |
| io.ClipboardUserData = NULL; |
| |
| g_MouseCursors[ImGuiMouseCursor_Arrow] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_ARROW); |
| g_MouseCursors[ImGuiMouseCursor_TextInput] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_IBEAM); |
| g_MouseCursors[ImGuiMouseCursor_ResizeAll] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEALL); |
| g_MouseCursors[ImGuiMouseCursor_ResizeNS] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENS); |
| g_MouseCursors[ImGuiMouseCursor_ResizeEW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZEWE); |
| g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENESW); |
| g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = SDL_CreateSystemCursor(SDL_SYSTEM_CURSOR_SIZENWSE); |
| |
| #ifdef _WIN32 |
| SDL_SysWMinfo wmInfo; |
| SDL_VERSION(&wmInfo.version); |
| SDL_GetWindowWMInfo(window, &wmInfo); |
| io.ImeWindowHandle = wmInfo.info.win.window; |
| #else |
| (void)window; |
| #endif |
| |
| return true; |
| } |
| |
| void ImGui_ImplSdlGL3_Shutdown() |
| { |
| // Destroy SDL mouse cursors |
| for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++) |
| SDL_FreeCursor(g_MouseCursors[cursor_n]); |
| memset(g_MouseCursors, 0, sizeof(g_MouseCursors)); |
| |
| // Destroy last known clipboard data |
| if (g_ClipboardTextData) |
| SDL_free(g_ClipboardTextData); |
| |
| // Destroy OpenGL objects |
| ImGui_ImplSdlGL3_InvalidateDeviceObjects(); |
| } |
| |
| void ImGui_ImplSdlGL3_NewFrame(SDL_Window* window) |
| { |
| if (!g_FontTexture) |
| ImGui_ImplSdlGL3_CreateDeviceObjects(); |
| |
| ImGuiIO& io = ImGui::GetIO(); |
| |
| // Setup display size (every frame to accommodate for window resizing) |
| int w, h; |
| int display_w, display_h; |
| SDL_GetWindowSize(window, &w, &h); |
| SDL_GL_GetDrawableSize(window, &display_w, &display_h); |
| io.DisplaySize = ImVec2((float)w, (float)h); |
| io.DisplayFramebufferScale = ImVec2(w > 0 ? ((float)display_w / w) : 0, h > 0 ? ((float)display_h / h) : 0); |
| |
| // Setup time step (we don't use SDL_GetTicks() because it is using millisecond resolution) |
| static Uint64 frequency = SDL_GetPerformanceFrequency(); |
| Uint64 current_time = SDL_GetPerformanceCounter(); |
| io.DeltaTime = g_Time > 0 ? (float)((double)(current_time - g_Time) / frequency) : (float)(1.0f / 60.0f); |
| g_Time = current_time; |
| |
| // Setup mouse inputs (we already got mouse wheel, keyboard keys & characters from our event handler) |
| int mx, my; |
| Uint32 mouse_buttons = SDL_GetMouseState(&mx, &my); |
| io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX); |
| 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. |
| io.MouseDown[1] = g_MousePressed[1] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0; |
| io.MouseDown[2] = g_MousePressed[2] || (mouse_buttons & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0; |
| g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false; |
| |
| // We need to use SDL_CaptureMouse() to easily retrieve mouse coordinates outside of the client area. This is only supported from SDL 2.0.4 (released Jan 2016) |
| #if (SDL_MAJOR_VERSION >= 2) && (SDL_MINOR_VERSION >= 0) && (SDL_PATCHLEVEL >= 4) |
| if ((SDL_GetWindowFlags(window) & (SDL_WINDOW_MOUSE_FOCUS | SDL_WINDOW_MOUSE_CAPTURE)) != 0) |
| io.MousePos = ImVec2((float)mx, (float)my); |
| bool any_mouse_button_down = false; |
| for (int n = 0; n < IM_ARRAYSIZE(io.MouseDown); n++) |
| any_mouse_button_down |= io.MouseDown[n]; |
| if (any_mouse_button_down && (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_CAPTURE) == 0) |
| SDL_CaptureMouse(SDL_TRUE); |
| if (!any_mouse_button_down && (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_CAPTURE) != 0) |
| SDL_CaptureMouse(SDL_FALSE); |
| #else |
| if ((SDL_GetWindowFlags(window) & SDL_WINDOW_INPUT_FOCUS) != 0) |
| io.MousePos = ImVec2((float)mx, (float)my); |
| #endif |
| |
| // Update OS/hardware mouse cursor if imgui isn't drawing a software cursor |
| if ((io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) == 0) |
| { |
| ImGuiMouseCursor cursor = ImGui::GetMouseCursor(); |
| if (io.MouseDrawCursor || cursor == ImGuiMouseCursor_None) |
| { |
| SDL_ShowCursor(0); |
| } |
| else |
| { |
| SDL_SetCursor(g_MouseCursors[cursor] ? g_MouseCursors[cursor] : g_MouseCursors[ImGuiMouseCursor_Arrow]); |
| SDL_ShowCursor(1); |
| } |
| } |
| |
| // Start the frame. This call will update the io.WantCaptureMouse, io.WantCaptureKeyboard flag that you can use to dispatch inputs (or not) to your application. |
| ImGui::NewFrame(); |
| } |