400 lines
15 KiB
C++
400 lines
15 KiB
C++
// ImGui SDL2 binding with OpenGL
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// You can copy and use unmodified imgui_impl_* files in your project.
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// If you use this binding you'll need to call 4 functions: ImGui_ImplXXXX_Init(), ImGui_ImplXXXX_NewFrame(), ImGui::Render() and ImGui_ImplXXXX_Shutdown().
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// See main.cpp for an example of using this.
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// https://github.com/ocornut/imgui
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#include <SDL2/SDL.h>
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#ifdef __EMSCRIPTEN__
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#include "emscripten.h"
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#include <GLES2/gl2.h>
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#else
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#include <SDL2/SDL_syswm.h>
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#include <SDL2/SDL_opengl.h>
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#include <GLES2/gl2.h>
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#endif
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#include "imgui.h"
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#include "imgui_impl_sdl.h"
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// Data
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static double g_Time = 0.0f;
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static bool g_FingerPressed = false;
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static bool g_FingerMotion = false;
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static float g_FingerX = -1;
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static float g_FingerY = -1;
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static bool g_MousePressed[3] = { false, false, false };
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static float g_MouseWheel = 0.0f;
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static GLuint g_FontTexture = 0;
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static int g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
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static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0;
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static int g_AttribLocationPosition = 0, g_AttribLocationUV = 0, g_AttribLocationColor = 0;
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static unsigned int g_VboHandle = 0, g_ElementsHandle = 0;
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// This is the main rendering function that you have to implement and provide to ImGui (via setting up 'RenderDrawListsFn' in the ImGuiIO structure)
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// If text or lines are blurry when integrating ImGui in your engine:
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// - in your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f)
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void ImGui_ImplSdl_RenderDrawLists(ImDrawData* draw_data) {
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// Backup GL state
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GLint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, &last_program);
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GLint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
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GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
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GLint last_element_array_buffer; glGetIntegerv(GL_ELEMENT_ARRAY_BUFFER_BINDING, &last_element_array_buffer);
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GLboolean last_enable_blend = glIsEnabled(GL_BLEND);
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GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE);
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GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST);
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GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST);
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// Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled
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glEnable(GL_BLEND);
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glBlendEquation(GL_FUNC_ADD);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glDisable(GL_CULL_FACE);
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glDisable(GL_DEPTH_TEST);
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glEnable(GL_SCISSOR_TEST);
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glActiveTexture(GL_TEXTURE0);
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// Handle cases of screen coordinates != from framebuffer coordinates (e.g. retina displays)
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ImGuiIO& io = ImGui::GetIO();
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float fb_height = io.DisplaySize.y * io.DisplayFramebufferScale.y;
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draw_data->ScaleClipRects(io.DisplayFramebufferScale);
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// Setup orthographic projection matrix
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const float ortho_projection[4][4] =
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{
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{ 2.0f / io.DisplaySize.x, 0.0f, 0.0f, 0.0f },
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{ 0.0f, 2.0f / -io.DisplaySize.y, 0.0f, 0.0f },
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{ 0.0f, 0.0f, -1.0f, 0.0f },
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{ -1.0f, 1.0f, 0.0f, 1.0f },
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};
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glUseProgram(g_ShaderHandle);
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glUniform1i(g_AttribLocationTex, 0);
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glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]);
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for (int n = 0; n < draw_data->CmdListsCount; n++) {
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const ImDrawList* cmd_list = draw_data->CmdLists[n];
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const ImDrawIdx* idx_buffer_offset = 0;
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glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle);
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glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.size() * sizeof(ImDrawVert), (GLvoid*)&cmd_list->VtxBuffer.front(), GL_STREAM_DRAW);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.size() * sizeof(ImDrawIdx), (GLvoid*)&cmd_list->IdxBuffer.front(), GL_STREAM_DRAW);
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glEnableVertexAttribArray(g_AttribLocationPosition);
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glEnableVertexAttribArray(g_AttribLocationUV);
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glEnableVertexAttribArray(g_AttribLocationColor);
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#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT))
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glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos));
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glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv));
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glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col));
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#undef OFFSETOF
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for (const ImDrawCmd* pcmd = cmd_list->CmdBuffer.begin(); pcmd != cmd_list->CmdBuffer.end(); pcmd++) {
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if (pcmd->UserCallback) {
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pcmd->UserCallback(cmd_list, pcmd);
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} else {
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glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId);
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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));
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glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, GL_UNSIGNED_SHORT, idx_buffer_offset);
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}
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idx_buffer_offset += pcmd->ElemCount;
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}
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}
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// Restore modified GL state
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glUseProgram(last_program);
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glBindTexture(GL_TEXTURE_2D, last_texture);
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glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, last_element_array_buffer);
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if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND);
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if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE);
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if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST);
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if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST);
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}
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static const char* ImGui_ImplSdl_GetClipboardText(void *) {
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return SDL_GetClipboardText();
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}
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static void ImGui_ImplSdl_SetClipboardText(void *, const char* text) {
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SDL_SetClipboardText(text);
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}
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void ImGui_ImplSdl_ProcessEvents(bool* quitFlag) {
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SDL_Event event;
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while (SDL_PollEvent(&event)) {
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ImGui_ImplSdl_ProcessEvent(&event);
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if (event.type == SDL_QUIT) {
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*quitFlag = false;
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}
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}
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}
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bool ImGui_ImplSdl_ProcessEvent(SDL_Event* event) {
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ImGuiIO& io = ImGui::GetIO();
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switch (event->type) {
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case SDL_MOUSEWHEEL: {
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if (event->wheel.y > 0) {
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g_MouseWheel = 1;
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} else if (event->wheel.y < 0) {
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g_MouseWheel = -1;
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}
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return true;
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}
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case SDL_FINGERMOTION: {
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g_FingerMotion = true;
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g_FingerX = event->tfinger.x;
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g_FingerY = event->tfinger.y;
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return true;
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}
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case SDL_FINGERDOWN: {
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g_FingerPressed = true;
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g_FingerMotion = true;
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g_FingerX = event->tfinger.x;
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g_FingerY = event->tfinger.y;
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return true;
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}
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case SDL_FINGERUP: {
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g_FingerPressed = false;
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return true;
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}
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case SDL_MOUSEBUTTONDOWN: {
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if (event->button.button == SDL_BUTTON_LEFT) g_MousePressed[0] = true;
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if (event->button.button == SDL_BUTTON_RIGHT) g_MousePressed[1] = true;
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if (event->button.button == SDL_BUTTON_MIDDLE) g_MousePressed[2] = true;
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return true;
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}
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case SDL_TEXTINPUT: {
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ImGuiIO& io = ImGui::GetIO();
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io.AddInputCharactersUTF8(event->text.text);
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return true;
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}
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case SDL_KEYDOWN:
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case SDL_KEYUP: {
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int key = event->key.keysym.sym & ~SDLK_SCANCODE_MASK;
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io.KeysDown[key] = (event->type == SDL_KEYDOWN);
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io.KeyShift = ((SDL_GetModState() & KMOD_SHIFT) != 0);
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io.KeyCtrl = ((SDL_GetModState() & KMOD_CTRL) != 0);
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io.KeyAlt = ((SDL_GetModState() & KMOD_ALT) != 0);
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return true;
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}
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}
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return false;
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}
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void ImGui_ImplSdl_CreateFontsTexture() {
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ImGuiIO& io = ImGui::GetIO();
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// Build texture atlas
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unsigned char* pixels;
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int width, height;
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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.
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// Create OpenGL texture
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glGenTextures(1, &g_FontTexture);
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glBindTexture(GL_TEXTURE_2D, g_FontTexture);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
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// Store our identifier
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io.Fonts->TexID = (void *)(intptr_t)g_FontTexture;
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// Cleanup (don't clear the input data if you want to append new fonts later)
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io.Fonts->ClearInputData();
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io.Fonts->ClearTexData();
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}
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bool ImGui_ImplSdl_CreateDeviceObjects()
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{
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// Backup GL state
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GLint last_texture, last_array_buffer;
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glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
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glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
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const GLchar *vertex_shader =
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#ifdef __EMSCRIPTEN__
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"precision highp float;\n"
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#endif
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"uniform mat4 ProjMtx;\n"
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"attribute vec2 Position;\n"
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"attribute vec2 UV;\n"
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"attribute vec4 Color;\n"
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"varying vec2 Frag_UV;\n"
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"varying vec4 Frag_Color;\n"
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"void main()\n"
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"{\n"
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" Frag_UV = UV;\n"
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" Frag_Color = Color;\n"
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" gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
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"}\n";
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const GLchar* fragment_shader =
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#ifdef __EMSCRIPTEN__
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"precision mediump float;\n"
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#endif
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"uniform sampler2D Texture;\n"
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"varying vec2 Frag_UV;\n"
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"varying vec4 Frag_Color;\n"
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"void main()\n"
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"{\n"
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" gl_FragColor = Frag_Color * texture2D( Texture, Frag_UV.st);\n"
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"}\n";
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g_ShaderHandle = glCreateProgram();
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g_VertHandle = glCreateShader(GL_VERTEX_SHADER);
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g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(g_VertHandle, 1, &vertex_shader, 0);
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glShaderSource(g_FragHandle, 1, &fragment_shader, 0);
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glCompileShader(g_VertHandle);
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glCompileShader(g_FragHandle);
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glAttachShader(g_ShaderHandle, g_VertHandle);
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glAttachShader(g_ShaderHandle, g_FragHandle);
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glLinkProgram(g_ShaderHandle);
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g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture");
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g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx");
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g_AttribLocationPosition = glGetAttribLocation(g_ShaderHandle, "Position");
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g_AttribLocationUV = glGetAttribLocation(g_ShaderHandle, "UV");
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g_AttribLocationColor = glGetAttribLocation(g_ShaderHandle, "Color");
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glGenBuffers(1, &g_VboHandle);
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glGenBuffers(1, &g_ElementsHandle);
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glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle);
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glEnableVertexAttribArray(g_AttribLocationPosition);
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glEnableVertexAttribArray(g_AttribLocationUV);
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glEnableVertexAttribArray(g_AttribLocationColor);
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#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT))
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glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos));
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glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv));
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glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col));
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#undef OFFSETOF
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ImGui_ImplSdl_CreateFontsTexture();
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// Restore modified GL state
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glBindTexture(GL_TEXTURE_2D, last_texture);
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glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
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return true;
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}
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void ImGui_ImplSdl_InvalidateDeviceObjects() {
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if (g_FontTexture) {
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glDeleteTextures(1, &g_FontTexture);
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ImGui::GetIO().Fonts->TexID = 0;
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g_FontTexture = 0;
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}
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}
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bool ImGui_ImplSdl_Init(SDL_Window *window)
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{
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ImGuiIO& io = ImGui::GetIO();
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io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array.
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io.KeyMap[ImGuiKey_LeftArrow] = SDL_SCANCODE_LEFT;
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io.KeyMap[ImGuiKey_RightArrow] = SDL_SCANCODE_RIGHT;
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io.KeyMap[ImGuiKey_UpArrow] = SDL_SCANCODE_UP;
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io.KeyMap[ImGuiKey_DownArrow] = SDL_SCANCODE_DOWN;
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io.KeyMap[ImGuiKey_PageUp] = SDL_SCANCODE_PAGEUP;
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io.KeyMap[ImGuiKey_PageDown] = SDL_SCANCODE_PAGEDOWN;
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io.KeyMap[ImGuiKey_Home] = SDL_SCANCODE_HOME;
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io.KeyMap[ImGuiKey_End] = SDL_SCANCODE_END;
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io.KeyMap[ImGuiKey_Delete] = SDLK_DELETE;
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io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE;
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io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN;
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io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE;
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io.KeyMap[ImGuiKey_A] = SDLK_a;
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io.KeyMap[ImGuiKey_C] = SDLK_c;
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io.KeyMap[ImGuiKey_V] = SDLK_v;
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io.KeyMap[ImGuiKey_X] = SDLK_x;
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io.KeyMap[ImGuiKey_Y] = SDLK_y;
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io.KeyMap[ImGuiKey_Z] = SDLK_z;
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io.RenderDrawListsFn = ImGui_ImplSdl_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
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io.SetClipboardTextFn = ImGui_ImplSdl_SetClipboardText;
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io.GetClipboardTextFn = ImGui_ImplSdl_GetClipboardText;
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#ifdef _WIN32
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SDL_SysWMinfo wmInfo;
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SDL_VERSION(&wmInfo.version);
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SDL_GetWindowWMInfo(window, &wmInfo);
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io.ImeWindowHandle = wmInfo.info.win.window;
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#endif
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return true;
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}
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void ImGui_ImplSdl_Shutdown() {
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ImGui_ImplSdl_InvalidateDeviceObjects();
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ImGui::Shutdown();
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}
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int cc = 0;
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void ImGui_ImplSdl_NewFrame(SDL_Window *window)
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{
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if (!g_FontTexture) {
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ImGui_ImplSdl_CreateDeviceObjects();
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}
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ImGuiIO& io = ImGui::GetIO();
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// Setup display size (every frame to accommodate for window resizing)
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int w, h;
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SDL_GetWindowSize(window, &w, &h);
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cc++;
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if (cc > 500) {
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printf("canvas w: %d h: %d\n",w,h);
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cc = 0;
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}
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io.DisplaySize = ImVec2((float)w, (float)h);
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// Setup time step
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Uint32 time = SDL_GetTicks();
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double current_time = time / 1000.0;
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io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f/60.0f);
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g_Time = current_time;
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// Setup inputs
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// (we already got mouse wheel, keyboard keys & characters from glfw callbacks polled in glfwPollEvents())
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int mx, my;
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Uint32 mouseMask = SDL_GetMouseState(&mx, &my);
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//printf("flags: 0x%.8X\n",SDL_GetWindowFlags(window));
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if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS) {
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io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
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} else {
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io.MousePos = ImVec2(-1,-1);
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}
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if (g_FingerX != -1) {
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io.MousePos = ImVec2(g_FingerX * ImGui::GetIO().DisplaySize.x, g_FingerY * ImGui::GetIO().DisplaySize.y);
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}
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io.MouseDown[0] = g_MousePressed[0] || (mouseMask & 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] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
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io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
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g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
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//printf("mousePos x: %f y: %f\n", io.MousePos.x, io.MousePos.y);
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if (g_FingerPressed) {
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io.MouseDown[0] = true;
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}
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if (g_FingerMotion || g_FingerPressed) {
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//io.MousePos = ImVec2(g_FingerX * ImGui::GetIO().DisplaySize.x,g_FingerY * ImGui::GetIO().DisplaySize.y);
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g_FingerMotion = false;
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printf("touchPos x: %f(%f) y: %f(%f)\n", io.MousePos.x,g_FingerX, io.MousePos.y, g_FingerY);
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}
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io.MouseWheel = g_MouseWheel;
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g_MouseWheel = 0.0f;
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// Hide OS mouse cursor if ImGui is drawing it
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SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1);
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// Start the frame
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ImGui::NewFrame();
|
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}
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