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authorLaG1924 <12997935+LaG1924@users.noreply.github.com>2017-08-29 17:25:30 +0200
committerLaG1924 <12997935+LaG1924@users.noreply.github.com>2018-01-13 03:39:31 +0100
commita0d5862d99186f317a0f7364e8b6cd3cfeccfdf1 (patch)
tree7bf54f8141c513650130e8d3cc6bd8ce3f71b1fe /src/imgui_impl_sdl_gl3.cpp
parent2017-08-27 (diff)
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Diffstat (limited to 'src/imgui_impl_sdl_gl3.cpp')
-rw-r--r--src/imgui_impl_sdl_gl3.cpp395
1 files changed, 395 insertions, 0 deletions
diff --git a/src/imgui_impl_sdl_gl3.cpp b/src/imgui_impl_sdl_gl3.cpp
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+++ b/src/imgui_impl_sdl_gl3.cpp
@@ -0,0 +1,395 @@
+// 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)
+// 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_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_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
+ 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);
+
+ // 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);
+
+ 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);
+ 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);
+ 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();
+}