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authorLaG1924 <lag1924@gmail.com>2021-06-13 10:53:13 +0200
committerLaG1924 <lag1924@gmail.com>2021-06-13 13:23:58 +0200
commite5da79b7bb1f0db50085df8eef905502d98617aa (patch)
treeedb8b84f5e6b4fa8776838dc598b9d0a7aff1259 /src/imgui_impl_sdl_gl3.cpp
parentImplemented basic RmlUi integration (diff)
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Diffstat (limited to 'src/imgui_impl_sdl_gl3.cpp')
-rw-r--r--src/imgui_impl_sdl_gl3.cpp401
1 files changed, 0 insertions, 401 deletions
diff --git a/src/imgui_impl_sdl_gl3.cpp b/src/imgui_impl_sdl_gl3.cpp
deleted file mode 100644
index 9833b12..0000000
--- a/src/imgui_impl_sdl_gl3.cpp
+++ /dev/null
@@ -1,401 +0,0 @@
-// ImGui SDL2 binding with OpenGL3
-// In this binding, ImTextureID is used to store an OpenGL 'GLuint' texture identifier. Read the FAQ about ImTextureID in imgui.cpp.
-
-// 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
-
-#include "imgui.h"
-#include "imgui_impl_sdl_gl3.h"
-
-// SDL,GL3W
-#include <SDL.h>
-#include <SDL_syswm.h>
-#include <GL/glew.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.
-
-// Data
-static double g_Time = 0.0f;
-static bool g_MousePressed[3] = { false, false, false };
-static float g_MouseWheel = 0.0f;
-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_VaoHandle = 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_RenderDrawLists(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]);
- glBindVertexArray(g_VaoHandle);
- glBindSampler(0, 0); // Rely on combined texture/sampler state.
-
- 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;
- }
- }
-
- // 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, 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*)
-{
- return SDL_GetClipboardText();
-}
-
-static void ImGui_ImplSdlGL3_SetClipboardText(void*, const char* text)
-{
- SDL_SetClipboardText(text);
-}
-
-bool ImGui_ImplSdlGL3_ProcessEvent(SDL_Event* event)
-{
- ImGuiIO& io = ImGui::GetIO();
- switch (event->type)
- {
- case SDL_MOUSEWHEEL:
- {
- if (event->wheel.y > 0)
- g_MouseWheel = 1;
- if (event->wheel.y < 0)
- g_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.sym & ~SDLK_SCANCODE_MASK;
- 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 =
- "#version 330\n"
- "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 =
- "#version 330\n"
- "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";
-
- g_ShaderHandle = glCreateProgram();
- g_VertHandle = glCreateShader(GL_VERTEX_SHADER);
- g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER);
- glShaderSource(g_VertHandle, 1, &vertex_shader, 0);
- glShaderSource(g_FragHandle, 1, &fragment_shader, 0);
- 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);
-
- glGenVertexArrays(1, &g_VaoHandle);
- glBindVertexArray(g_VaoHandle);
- glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle);
- glEnableVertexAttribArray(g_AttribLocationPosition);
- glEnableVertexAttribArray(g_AttribLocationUV);
- glEnableVertexAttribArray(g_AttribLocationColor);
-
-#define OFFSETOF(TYPE, ELEMENT) ((size_t)&(((TYPE *)0)->ELEMENT))
- glVertexAttribPointer(g_AttribLocationPosition, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, pos));
- glVertexAttribPointer(g_AttribLocationUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, uv));
- glVertexAttribPointer(g_AttribLocationColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)OFFSETOF(ImDrawVert, col));
-#undef OFFSETOF
-
- 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_VaoHandle) glDeleteVertexArrays(1, &g_VaoHandle);
- if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle);
- if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle);
- g_VaoHandle = 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)
-{
- ImGuiIO& io = ImGui::GetIO();
- io.KeyMap[ImGuiKey_Tab] = SDLK_TAB; // Keyboard mapping. ImGui will use those indices to peek into the io.KeyDown[] array.
- 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_Delete] = SDLK_DELETE;
- io.KeyMap[ImGuiKey_Backspace] = SDLK_BACKSPACE;
- io.KeyMap[ImGuiKey_Enter] = SDLK_RETURN;
- io.KeyMap[ImGuiKey_Escape] = SDLK_ESCAPE;
- io.KeyMap[ImGuiKey_A] = SDLK_a;
- io.KeyMap[ImGuiKey_C] = SDLK_c;
- io.KeyMap[ImGuiKey_V] = SDLK_v;
- io.KeyMap[ImGuiKey_X] = SDLK_x;
- io.KeyMap[ImGuiKey_Y] = SDLK_y;
- io.KeyMap[ImGuiKey_Z] = SDLK_z;
-
- io.RenderDrawListsFn = ImGui_ImplSdlGL3_RenderDrawLists; // Alternatively you can set this to NULL and call ImGui::GetDrawData() after ImGui::Render() to get the same ImDrawData pointer.
- io.SetClipboardTextFn = ImGui_ImplSdlGL3_SetClipboardText;
- io.GetClipboardTextFn = ImGui_ImplSdlGL3_GetClipboardText;
- io.ClipboardUserData = NULL;
-
-#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()
-{
- ImGui_ImplSdlGL3_InvalidateDeviceObjects();
- ImGui::Shutdown();
-}
-
-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
- Uint32 time = SDL_GetTicks();
- double current_time = time / 1000.0;
- io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f);
- g_Time = current_time;
-
- // Setup inputs
- // (we already got mouse wheel, keyboard keys & characters from SDL_PollEvent())
- int mx, my;
- Uint32 mouseMask = SDL_GetMouseState(&mx, &my);
- if (SDL_GetWindowFlags(window) & SDL_WINDOW_MOUSE_FOCUS)
- io.MousePos = ImVec2((float)mx, (float)my); // Mouse position, in pixels (set to -1,-1 if no mouse / on another screen, etc.)
- else
- io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
-
- 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.
- io.MouseDown[1] = g_MousePressed[1] || (mouseMask & SDL_BUTTON(SDL_BUTTON_RIGHT)) != 0;
- io.MouseDown[2] = g_MousePressed[2] || (mouseMask & SDL_BUTTON(SDL_BUTTON_MIDDLE)) != 0;
- g_MousePressed[0] = g_MousePressed[1] = g_MousePressed[2] = false;
-
- io.MouseWheel = g_MouseWheel;
- g_MouseWheel = 0.0f;
-
- // Hide OS mouse cursor if ImGui is drawing it
- SDL_ShowCursor(io.MouseDrawCursor ? 0 : 1);
-
- // Start the frame
- ImGui::NewFrame();
-}