diff options
Diffstat (limited to '3rdparty/imgui/backends/imgui_impl_opengl3.cpp')
| -rw-r--r-- | 3rdparty/imgui/backends/imgui_impl_opengl3.cpp | 811 |
1 files changed, 0 insertions, 811 deletions
diff --git a/3rdparty/imgui/backends/imgui_impl_opengl3.cpp b/3rdparty/imgui/backends/imgui_impl_opengl3.cpp deleted file mode 100644 index 0d3489c..0000000 --- a/3rdparty/imgui/backends/imgui_impl_opengl3.cpp +++ /dev/null @@ -1,811 +0,0 @@ -// dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline -// - Desktop GL: 2.x 3.x 4.x -// - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0) -// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..) - -// Implemented features: -// [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID! -// [x] Renderer: Desktop GL only: Support for large meshes (64k+ vertices) with 16-bit indices. - -// You can use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this. -// Prefer including the entire imgui/ repository into your project (either as a copy or as a submodule), and only build the backends you need. -// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp. -// Read online: https://github.com/ocornut/imgui/tree/master/docs - -// CHANGELOG -// (minor and older changes stripped away, please see git history for details) -// 2021-12-15: OpenGL: Using buffer orphaning + glBufferSubData(), seems to fix leaks with multi-viewports with some Intel HD drivers. -// 2021-08-23: OpenGL: Fixed ES 3.0 shader ("#version 300 es") use normal precision floats to avoid wobbly rendering at HD resolutions. -// 2021-08-19: OpenGL: Embed and use our own minimal GL loader (imgui_impl_opengl3_loader.h), removing requirement and support for third-party loader. -// 2021-06-29: Reorganized backend to pull data from a single structure to facilitate usage with multiple-contexts (all g_XXXX access changed to bd->XXXX). -// 2021-06-25: OpenGL: Use OES_vertex_array extension on Emscripten + backup/restore current state. -// 2021-06-21: OpenGL: Destroy individual vertex/fragment shader objects right after they are linked into the main shader. -// 2021-05-24: OpenGL: Access GL_CLIP_ORIGIN when "GL_ARB_clip_control" extension is detected, inside of just OpenGL 4.5 version. -// 2021-05-19: OpenGL: Replaced direct access to ImDrawCmd::TextureId with a call to ImDrawCmd::GetTexID(). (will become a requirement) -// 2021-04-06: OpenGL: Don't try to read GL_CLIP_ORIGIN unless we're OpenGL 4.5 or greater. -// 2021-02-18: OpenGL: Change blending equation to preserve alpha in output buffer. -// 2021-01-03: OpenGL: Backup, setup and restore GL_STENCIL_TEST state. -// 2020-10-23: OpenGL: Backup, setup and restore GL_PRIMITIVE_RESTART state. -// 2020-10-15: OpenGL: Use glGetString(GL_VERSION) instead of glGetIntegerv(GL_MAJOR_VERSION, ...) when the later returns zero (e.g. Desktop GL 2.x) -// 2020-09-17: OpenGL: Fix to avoid compiling/calling glBindSampler() on ES or pre 3.3 context which have the defines set by a loader. -// 2020-07-10: OpenGL: Added support for glad2 OpenGL loader. -// 2020-05-08: OpenGL: Made default GLSL version 150 (instead of 130) on OSX. -// 2020-04-21: OpenGL: Fixed handling of glClipControl(GL_UPPER_LEFT) by inverting projection matrix. -// 2020-04-12: OpenGL: Fixed context version check mistakenly testing for 4.0+ instead of 3.2+ to enable ImGuiBackendFlags_RendererHasVtxOffset. -// 2020-03-24: OpenGL: Added support for glbinding 2.x OpenGL loader. -// 2020-01-07: OpenGL: Added support for glbinding 3.x OpenGL loader. -// 2019-10-25: OpenGL: Using a combination of GL define and runtime GL version to decide whether to use glDrawElementsBaseVertex(). Fix building with pre-3.2 GL loaders. -// 2019-09-22: OpenGL: Detect default GL loader using __has_include compiler facility. -// 2019-09-16: OpenGL: Tweak initialization code to allow application calling ImGui_ImplOpenGL3_CreateFontsTexture() before the first NewFrame() call. -// 2019-05-29: OpenGL: Desktop GL only: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag. -// 2019-04-30: OpenGL: Added support for special ImDrawCallback_ResetRenderState callback to reset render state. -// 2019-03-29: OpenGL: Not calling glBindBuffer more than necessary in the render loop. -// 2019-03-15: OpenGL: Added a GL call + comments in ImGui_ImplOpenGL3_Init() to detect uninitialized GL function loaders early. -// 2019-03-03: OpenGL: Fix support for ES 2.0 (WebGL 1.0). -// 2019-02-20: OpenGL: Fix for OSX not supporting OpenGL 4.5, we don't try to read GL_CLIP_ORIGIN even if defined by the headers/loader. -// 2019-02-11: OpenGL: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display. -// 2019-02-01: OpenGL: Using GLSL 410 shaders for any version over 410 (e.g. 430, 450). -// 2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window. -// 2018-11-13: OpenGL: Support for GL 4.5's glClipControl(GL_UPPER_LEFT) / GL_CLIP_ORIGIN. -// 2018-08-29: OpenGL: Added support for more OpenGL loaders: glew and glad, with comments indicative that any loader can be used. -// 2018-08-09: OpenGL: Default to OpenGL ES 3 on iOS and Android. GLSL version default to "#version 300 ES". -// 2018-07-30: OpenGL: Support for GLSL 300 ES and 410 core. Fixes for Emscripten compilation. -// 2018-07-10: OpenGL: Support for more GLSL versions (based on the GLSL version string). Added error output when shaders fail to compile/link. -// 2018-06-08: Misc: Extracted imgui_impl_opengl3.cpp/.h away from the old combined GLFW/SDL+OpenGL3 examples. -// 2018-06-08: OpenGL: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle. -// 2018-05-25: OpenGL: Removed unnecessary backup/restore of GL_ELEMENT_ARRAY_BUFFER_BINDING since this is part of the VAO state. -// 2018-05-14: OpenGL: Making the call to glBindSampler() optional so 3.2 context won't fail if the function is a NULL pointer. -// 2018-03-06: OpenGL: Added const char* glsl_version parameter to ImGui_ImplOpenGL3_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: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplSdlGL3_RenderDrawData() in the .h file so you can call it yourself. -// 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. -// 2017-05-01: OpenGL: Fixed save and restore of current blend func state. -// 2017-05-01: OpenGL: Fixed save and restore of current GL_ACTIVE_TEXTURE. -// 2016-09-05: 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) - -//---------------------------------------- -// OpenGL GLSL GLSL -// version version string -//---------------------------------------- -// 2.0 110 "#version 110" -// 2.1 120 "#version 120" -// 3.0 130 "#version 130" -// 3.1 140 "#version 140" -// 3.2 150 "#version 150" -// 3.3 330 "#version 330 core" -// 4.0 400 "#version 400 core" -// 4.1 410 "#version 410 core" -// 4.2 420 "#version 410 core" -// 4.3 430 "#version 430 core" -// ES 2.0 100 "#version 100" = WebGL 1.0 -// ES 3.0 300 "#version 300 es" = WebGL 2.0 -//---------------------------------------- - -#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS) -#define _CRT_SECURE_NO_WARNINGS -#endif - -#include "imgui.h" -#include "imgui_impl_opengl3.h" -#include <stdio.h> -#if defined(_MSC_VER) && _MSC_VER <= 1500 // MSVC 2008 or earlier -#include <stddef.h> // intptr_t -#else -#include <stdint.h> // intptr_t -#endif - -// Clang warnings with -Weverything -#if defined(__clang__) -#pragma clang diagnostic push -#pragma clang diagnostic ignored "-Wold-style-cast" // warning: use of old-style cast -#pragma clang diagnostic ignored "-Wsign-conversion" // warning: implicit conversion changes signedness -#if __has_warning("-Wzero-as-null-pointer-constant") -#pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant" -#endif -#endif - -// GL includes -#if defined(IMGUI_IMPL_OPENGL_ES2) -#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) -#include <OpenGLES/ES2/gl.h> // Use GL ES 2 -#else -#include <GLES2/gl2.h> // Use GL ES 2 -#endif -#if defined(__EMSCRIPTEN__) -#ifndef GL_GLEXT_PROTOTYPES -#define GL_GLEXT_PROTOTYPES -#endif -#include <GLES2/gl2ext.h> -#endif -#elif defined(IMGUI_IMPL_OPENGL_ES3) -#if defined(__APPLE__) -#include <TargetConditionals.h> -#endif -#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) -#include <OpenGLES/ES3/gl.h> // Use GL ES 3 -#else -#include <GLES3/gl3.h> // Use GL ES 3 -#endif -#elif !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM) -// Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers. -// Helper libraries are often used for this purpose! Here we are using our own minimal custom loader based on gl3w. -// In the rest of your app/engine, you can use another loader of your choice (gl3w, glew, glad, glbinding, glext, glLoadGen, etc.). -// If you happen to be developing a new feature for this backend (imgui_impl_opengl3.cpp): -// - You may need to regenerate imgui_impl_opengl3_loader.h to add new symbols. See https://github.com/dearimgui/gl3w_stripped -// - You can temporarily use an unstripped version. See https://github.com/dearimgui/gl3w_stripped/releases -// Changes to this backend using new APIs should be accompanied by a regenerated stripped loader version. -#define IMGL3W_IMPL -#include "imgui_impl_opengl3_loader.h" -#endif - -// Vertex arrays are not supported on ES2/WebGL1 unless Emscripten which uses an extension -#ifndef IMGUI_IMPL_OPENGL_ES2 -#define IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY -#elif defined(__EMSCRIPTEN__) -#define IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY -#define glBindVertexArray glBindVertexArrayOES -#define glGenVertexArrays glGenVertexArraysOES -#define glDeleteVertexArrays glDeleteVertexArraysOES -#define GL_VERTEX_ARRAY_BINDING GL_VERTEX_ARRAY_BINDING_OES -#endif - -// Desktop GL 2.0+ has glPolygonMode() which GL ES and WebGL don't have. -#ifdef GL_POLYGON_MODE -#define IMGUI_IMPL_HAS_POLYGON_MODE -#endif - -// Desktop GL 3.2+ has glDrawElementsBaseVertex() which GL ES and WebGL don't have. -#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_2) -#define IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET -#endif - -// Desktop GL 3.3+ has glBindSampler() -#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_3) -#define IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER -#endif - -// Desktop GL 3.1+ has GL_PRIMITIVE_RESTART state -#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_1) -#define IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART -#endif - -// Desktop GL use extension detection -#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) -#define IMGUI_IMPL_OPENGL_MAY_HAVE_EXTENSIONS -#endif - -// OpenGL Data -struct ImGui_ImplOpenGL3_Data -{ - GLuint GlVersion; // Extracted at runtime using GL_MAJOR_VERSION, GL_MINOR_VERSION queries (e.g. 320 for GL 3.2) - char GlslVersionString[32]; // Specified by user or detected based on compile time GL settings. - GLuint FontTexture; - GLuint ShaderHandle; - GLint AttribLocationTex; // Uniforms location - GLint AttribLocationProjMtx; - GLuint AttribLocationVtxPos; // Vertex attributes location - GLuint AttribLocationVtxUV; - GLuint AttribLocationVtxColor; - unsigned int VboHandle, ElementsHandle; - GLsizeiptr VertexBufferSize; - GLsizeiptr IndexBufferSize; - bool HasClipOrigin; - - ImGui_ImplOpenGL3_Data() { memset(this, 0, sizeof(*this)); } -}; - -// Backend data stored in io.BackendRendererUserData to allow support for multiple Dear ImGui contexts -// It is STRONGLY preferred that you use docking branch with multi-viewports (== single Dear ImGui context + multiple windows) instead of multiple Dear ImGui contexts. -static ImGui_ImplOpenGL3_Data* ImGui_ImplOpenGL3_GetBackendData() -{ - return ImGui::GetCurrentContext() ? (ImGui_ImplOpenGL3_Data*)ImGui::GetIO().BackendRendererUserData : NULL; -} - -// Functions -bool ImGui_ImplOpenGL3_Init(const char* glsl_version) -{ - ImGuiIO& io = ImGui::GetIO(); - IM_ASSERT(io.BackendRendererUserData == NULL && "Already initialized a renderer backend!"); - - // Initialize our loader -#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM) - if (imgl3wInit() != 0) - { - fprintf(stderr, "Failed to initialize OpenGL loader!\n"); - return false; - } -#endif - - // Setup backend capabilities flags - ImGui_ImplOpenGL3_Data* bd = IM_NEW(ImGui_ImplOpenGL3_Data)(); - io.BackendRendererUserData = (void*)bd; - io.BackendRendererName = "imgui_impl_opengl3"; - - // Query for GL version (e.g. 320 for GL 3.2) -#if !defined(IMGUI_IMPL_OPENGL_ES2) - GLint major = 0; - GLint minor = 0; - glGetIntegerv(GL_MAJOR_VERSION, &major); - glGetIntegerv(GL_MINOR_VERSION, &minor); - if (major == 0 && minor == 0) - { - // Query GL_VERSION in desktop GL 2.x, the string will start with "<major>.<minor>" - const char* gl_version = (const char*)glGetString(GL_VERSION); - sscanf(gl_version, "%d.%d", &major, &minor); - } - bd->GlVersion = (GLuint)(major * 100 + minor * 10); -#else - bd->GlVersion = 200; // GLES 2 -#endif - -#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET - if (bd->GlVersion >= 320) - io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset; // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes. -#endif - - // Store GLSL version string so we can refer to it later in case we recreate shaders. - // Note: GLSL version is NOT the same as GL version. Leave this to NULL if unsure. - if (glsl_version == NULL) - { -#if defined(IMGUI_IMPL_OPENGL_ES2) - glsl_version = "#version 100"; -#elif defined(IMGUI_IMPL_OPENGL_ES3) - glsl_version = "#version 300 es"; -#elif defined(__APPLE__) - glsl_version = "#version 150"; -#else - glsl_version = "#version 130"; -#endif - } - IM_ASSERT((int)strlen(glsl_version) + 2 < IM_ARRAYSIZE(bd->GlslVersionString)); - strcpy(bd->GlslVersionString, glsl_version); - strcat(bd->GlslVersionString, "\n"); - - // Make an arbitrary GL call (we don't actually need the result) - // IF YOU GET A CRASH HERE: it probably means the OpenGL function loader didn't do its job. Let us know! - GLint current_texture; - glGetIntegerv(GL_TEXTURE_BINDING_2D, ¤t_texture); - - // Detect extensions we support - bd->HasClipOrigin = (bd->GlVersion >= 450); -#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_EXTENSIONS - GLint num_extensions = 0; - glGetIntegerv(GL_NUM_EXTENSIONS, &num_extensions); - for (GLint i = 0; i < num_extensions; i++) - { - const char* extension = (const char*)glGetStringi(GL_EXTENSIONS, i); - if (extension != NULL && strcmp(extension, "GL_ARB_clip_control") == 0) - bd->HasClipOrigin = true; - } -#endif - - return true; -} - -void ImGui_ImplOpenGL3_Shutdown() -{ - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - IM_ASSERT(bd != NULL && "No renderer backend to shutdown, or already shutdown?"); - ImGuiIO& io = ImGui::GetIO(); - - ImGui_ImplOpenGL3_DestroyDeviceObjects(); - io.BackendRendererName = NULL; - io.BackendRendererUserData = NULL; - IM_DELETE(bd); -} - -void ImGui_ImplOpenGL3_NewFrame() -{ - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - IM_ASSERT(bd != NULL && "Did you call ImGui_ImplOpenGL3_Init()?"); - - if (!bd->ShaderHandle) - ImGui_ImplOpenGL3_CreateDeviceObjects(); -} - -static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height, GLuint vertex_array_object) -{ - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - - // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, polygon fill - glEnable(GL_BLEND); - glBlendEquation(GL_FUNC_ADD); - glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA); - glDisable(GL_CULL_FACE); - glDisable(GL_DEPTH_TEST); - glDisable(GL_STENCIL_TEST); - glEnable(GL_SCISSOR_TEST); -#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART - if (bd->GlVersion >= 310) - glDisable(GL_PRIMITIVE_RESTART); -#endif -#ifdef IMGUI_IMPL_HAS_POLYGON_MODE - glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); -#endif - - // Support for GL 4.5 rarely used glClipControl(GL_UPPER_LEFT) -#if defined(GL_CLIP_ORIGIN) - bool clip_origin_lower_left = true; - if (bd->HasClipOrigin) - { - GLenum current_clip_origin = 0; glGetIntegerv(GL_CLIP_ORIGIN, (GLint*)¤t_clip_origin); - if (current_clip_origin == GL_UPPER_LEFT) - clip_origin_lower_left = false; - } -#endif - - // Setup viewport, orthographic projection matrix - // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps. - glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height); - float L = draw_data->DisplayPos.x; - float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x; - float T = draw_data->DisplayPos.y; - float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y; -#if defined(GL_CLIP_ORIGIN) - if (!clip_origin_lower_left) { float tmp = T; T = B; B = tmp; } // Swap top and bottom if origin is upper left -#endif - const float ortho_projection[4][4] = - { - { 2.0f/(R-L), 0.0f, 0.0f, 0.0f }, - { 0.0f, 2.0f/(T-B), 0.0f, 0.0f }, - { 0.0f, 0.0f, -1.0f, 0.0f }, - { (R+L)/(L-R), (T+B)/(B-T), 0.0f, 1.0f }, - }; - glUseProgram(bd->ShaderHandle); - glUniform1i(bd->AttribLocationTex, 0); - glUniformMatrix4fv(bd->AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); - -#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER - if (bd->GlVersion >= 330) - glBindSampler(0, 0); // We use combined texture/sampler state. Applications using GL 3.3 may set that otherwise. -#endif - - (void)vertex_array_object; -#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY - glBindVertexArray(vertex_array_object); -#endif - - // Bind vertex/index buffers and setup attributes for ImDrawVert - glBindBuffer(GL_ARRAY_BUFFER, bd->VboHandle); - glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bd->ElementsHandle); - glEnableVertexAttribArray(bd->AttribLocationVtxPos); - glEnableVertexAttribArray(bd->AttribLocationVtxUV); - glEnableVertexAttribArray(bd->AttribLocationVtxColor); - glVertexAttribPointer(bd->AttribLocationVtxPos, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, pos)); - glVertexAttribPointer(bd->AttribLocationVtxUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, uv)); - glVertexAttribPointer(bd->AttribLocationVtxColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, col)); -} - -// OpenGL3 Render function. -// Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly. -// This is in order to be able to run within an OpenGL engine that doesn't do so. -void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data) -{ - // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates) - int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x); - int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y); - if (fb_width <= 0 || fb_height <= 0) - return; - - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - - // Backup GL state - GLenum last_active_texture; glGetIntegerv(GL_ACTIVE_TEXTURE, (GLint*)&last_active_texture); - glActiveTexture(GL_TEXTURE0); - GLuint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, (GLint*)&last_program); - GLuint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, (GLint*)&last_texture); -#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER - GLuint last_sampler; if (bd->GlVersion >= 330) { glGetIntegerv(GL_SAMPLER_BINDING, (GLint*)&last_sampler); } else { last_sampler = 0; } -#endif - GLuint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, (GLint*)&last_array_buffer); -#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY - GLuint last_vertex_array_object; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, (GLint*)&last_vertex_array_object); -#endif -#ifdef IMGUI_IMPL_HAS_POLYGON_MODE - GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode); -#endif - 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_stencil_test = glIsEnabled(GL_STENCIL_TEST); - GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST); -#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART - GLboolean last_enable_primitive_restart = (bd->GlVersion >= 310) ? glIsEnabled(GL_PRIMITIVE_RESTART) : GL_FALSE; -#endif - - // Setup desired GL state - // Recreate the VAO every time (this is to easily allow multiple GL contexts to be rendered to. VAO are not shared among GL contexts) - // The renderer would actually work without any VAO bound, but then our VertexAttrib calls would overwrite the default one currently bound. - GLuint vertex_array_object = 0; -#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY - glGenVertexArrays(1, &vertex_array_object); -#endif - ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object); - - // Will project scissor/clipping rectangles into framebuffer space - ImVec2 clip_off = draw_data->DisplayPos; // (0,0) unless using multi-viewports - ImVec2 clip_scale = draw_data->FramebufferScale; // (1,1) unless using retina display which are often (2,2) - - // Render command lists - for (int n = 0; n < draw_data->CmdListsCount; n++) - { - const ImDrawList* cmd_list = draw_data->CmdLists[n]; - - // Upload vertex/index buffers - GLsizeiptr vtx_buffer_size = (GLsizeiptr)cmd_list->VtxBuffer.Size * (int)sizeof(ImDrawVert); - GLsizeiptr idx_buffer_size = (GLsizeiptr)cmd_list->IdxBuffer.Size * (int)sizeof(ImDrawIdx); - if (bd->VertexBufferSize < vtx_buffer_size) - { - bd->VertexBufferSize = vtx_buffer_size; - glBufferData(GL_ARRAY_BUFFER, bd->VertexBufferSize, NULL, GL_STREAM_DRAW); - } - if (bd->IndexBufferSize < idx_buffer_size) - { - bd->IndexBufferSize = idx_buffer_size; - glBufferData(GL_ELEMENT_ARRAY_BUFFER, bd->IndexBufferSize, NULL, GL_STREAM_DRAW); - } - glBufferSubData(GL_ARRAY_BUFFER, 0, vtx_buffer_size, (const GLvoid*)cmd_list->VtxBuffer.Data); - glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, 0, idx_buffer_size, (const GLvoid*)cmd_list->IdxBuffer.Data); - - for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++) - { - const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i]; - if (pcmd->UserCallback != NULL) - { - // User callback, registered via ImDrawList::AddCallback() - // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.) - if (pcmd->UserCallback == ImDrawCallback_ResetRenderState) - ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object); - else - pcmd->UserCallback(cmd_list, pcmd); - } - else - { - // Project scissor/clipping rectangles into framebuffer space - ImVec2 clip_min((pcmd->ClipRect.x - clip_off.x) * clip_scale.x, (pcmd->ClipRect.y - clip_off.y) * clip_scale.y); - ImVec2 clip_max((pcmd->ClipRect.z - clip_off.x) * clip_scale.x, (pcmd->ClipRect.w - clip_off.y) * clip_scale.y); - if (clip_max.x <= clip_min.x || clip_max.y <= clip_min.y) - continue; - - // Apply scissor/clipping rectangle (Y is inverted in OpenGL) - glScissor((int)clip_min.x, (int)((float)fb_height - clip_max.y), (int)(clip_max.x - clip_min.x), (int)(clip_max.y - clip_min.y)); - - // Bind texture, Draw - glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->GetTexID()); -#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET - if (bd->GlVersion >= 320) - glDrawElementsBaseVertex(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx)), (GLint)pcmd->VtxOffset); - else -#endif - glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx))); - } - } - } - - // Destroy the temporary VAO -#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY - glDeleteVertexArrays(1, &vertex_array_object); -#endif - - // Restore modified GL state - glUseProgram(last_program); - glBindTexture(GL_TEXTURE_2D, last_texture); -#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER - if (bd->GlVersion >= 330) - glBindSampler(0, last_sampler); -#endif - glActiveTexture(last_active_texture); -#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY - glBindVertexArray(last_vertex_array_object); -#endif - glBindBuffer(GL_ARRAY_BUFFER, last_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_stencil_test) glEnable(GL_STENCIL_TEST); else glDisable(GL_STENCIL_TEST); - if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); -#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART - if (bd->GlVersion >= 310) { if (last_enable_primitive_restart) glEnable(GL_PRIMITIVE_RESTART); else glDisable(GL_PRIMITIVE_RESTART); } -#endif - -#ifdef IMGUI_IMPL_HAS_POLYGON_MODE - glPolygonMode(GL_FRONT_AND_BACK, (GLenum)last_polygon_mode[0]); -#endif - 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]); - (void)bd; // Not all compilation paths use this -} - -bool ImGui_ImplOpenGL3_CreateFontsTexture() -{ - ImGuiIO& io = ImGui::GetIO(); - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - - // Build texture atlas - unsigned char* pixels; - int width, height; - io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height); // Load as RGBA 32-bit (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory. - - // Upload texture to graphics system - GLint last_texture; - glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); - glGenTextures(1, &bd->FontTexture); - glBindTexture(GL_TEXTURE_2D, bd->FontTexture); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); - glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); -#ifdef GL_UNPACK_ROW_LENGTH // Not on WebGL/ES - glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); -#endif - glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); - - // Store our identifier - io.Fonts->SetTexID((ImTextureID)(intptr_t)bd->FontTexture); - - // Restore state - glBindTexture(GL_TEXTURE_2D, last_texture); - - return true; -} - -void ImGui_ImplOpenGL3_DestroyFontsTexture() -{ - ImGuiIO& io = ImGui::GetIO(); - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - if (bd->FontTexture) - { - glDeleteTextures(1, &bd->FontTexture); - io.Fonts->SetTexID(0); - bd->FontTexture = 0; - } -} - -// If you get an error please report on github. You may try different GL context version or GLSL version. See GL<>GLSL version table at the top of this file. -static bool CheckShader(GLuint handle, const char* desc) -{ - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - GLint status = 0, log_length = 0; - glGetShaderiv(handle, GL_COMPILE_STATUS, &status); - glGetShaderiv(handle, GL_INFO_LOG_LENGTH, &log_length); - if ((GLboolean)status == GL_FALSE) - fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to compile %s! With GLSL: %s\n", desc, bd->GlslVersionString); - if (log_length > 1) - { - ImVector<char> buf; - buf.resize((int)(log_length + 1)); - glGetShaderInfoLog(handle, log_length, NULL, (GLchar*)buf.begin()); - fprintf(stderr, "%s\n", buf.begin()); - } - return (GLboolean)status == GL_TRUE; -} - -// If you get an error please report on GitHub. You may try different GL context version or GLSL version. -static bool CheckProgram(GLuint handle, const char* desc) -{ - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - GLint status = 0, log_length = 0; - glGetProgramiv(handle, GL_LINK_STATUS, &status); - glGetProgramiv(handle, GL_INFO_LOG_LENGTH, &log_length); - if ((GLboolean)status == GL_FALSE) - fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to link %s! With GLSL %s\n", desc, bd->GlslVersionString); - if (log_length > 1) - { - ImVector<char> buf; - buf.resize((int)(log_length + 1)); - glGetProgramInfoLog(handle, log_length, NULL, (GLchar*)buf.begin()); - fprintf(stderr, "%s\n", buf.begin()); - } - return (GLboolean)status == GL_TRUE; -} - -bool ImGui_ImplOpenGL3_CreateDeviceObjects() -{ - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - - // Backup GL state - GLint last_texture, last_array_buffer; - glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); - glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); -#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY - GLint last_vertex_array; - glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); -#endif - - // Parse GLSL version string - int glsl_version = 130; - sscanf(bd->GlslVersionString, "#version %d", &glsl_version); - - const GLchar* vertex_shader_glsl_120 = - "uniform mat4 ProjMtx;\n" - "attribute vec2 Position;\n" - "attribute vec2 UV;\n" - "attribute vec4 Color;\n" - "varying vec2 Frag_UV;\n" - "varying 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* vertex_shader_glsl_130 = - "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* vertex_shader_glsl_300_es = - "precision highp float;\n" - "layout (location = 0) in vec2 Position;\n" - "layout (location = 1) in vec2 UV;\n" - "layout (location = 2) in vec4 Color;\n" - "uniform mat4 ProjMtx;\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* vertex_shader_glsl_410_core = - "layout (location = 0) in vec2 Position;\n" - "layout (location = 1) in vec2 UV;\n" - "layout (location = 2) in vec4 Color;\n" - "uniform mat4 ProjMtx;\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_glsl_120 = - "#ifdef GL_ES\n" - " precision mediump float;\n" - "#endif\n" - "uniform sampler2D Texture;\n" - "varying vec2 Frag_UV;\n" - "varying vec4 Frag_Color;\n" - "void main()\n" - "{\n" - " gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV.st);\n" - "}\n"; - - const GLchar* fragment_shader_glsl_130 = - "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* fragment_shader_glsl_300_es = - "precision mediump float;\n" - "uniform sampler2D Texture;\n" - "in vec2 Frag_UV;\n" - "in vec4 Frag_Color;\n" - "layout (location = 0) out vec4 Out_Color;\n" - "void main()\n" - "{\n" - " Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n" - "}\n"; - - const GLchar* fragment_shader_glsl_410_core = - "in vec2 Frag_UV;\n" - "in vec4 Frag_Color;\n" - "uniform sampler2D Texture;\n" - "layout (location = 0) out vec4 Out_Color;\n" - "void main()\n" - "{\n" - " Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n" - "}\n"; - - // Select shaders matching our GLSL versions - const GLchar* vertex_shader = NULL; - const GLchar* fragment_shader = NULL; - if (glsl_version < 130) - { - vertex_shader = vertex_shader_glsl_120; - fragment_shader = fragment_shader_glsl_120; - } - else if (glsl_version >= 410) - { - vertex_shader = vertex_shader_glsl_410_core; - fragment_shader = fragment_shader_glsl_410_core; - } - else if (glsl_version == 300) - { - vertex_shader = vertex_shader_glsl_300_es; - fragment_shader = fragment_shader_glsl_300_es; - } - else - { - vertex_shader = vertex_shader_glsl_130; - fragment_shader = fragment_shader_glsl_130; - } - - // Create shaders - const GLchar* vertex_shader_with_version[2] = { bd->GlslVersionString, vertex_shader }; - GLuint vert_handle = glCreateShader(GL_VERTEX_SHADER); - glShaderSource(vert_handle, 2, vertex_shader_with_version, NULL); - glCompileShader(vert_handle); - CheckShader(vert_handle, "vertex shader"); - - const GLchar* fragment_shader_with_version[2] = { bd->GlslVersionString, fragment_shader }; - GLuint frag_handle = glCreateShader(GL_FRAGMENT_SHADER); - glShaderSource(frag_handle, 2, fragment_shader_with_version, NULL); - glCompileShader(frag_handle); - CheckShader(frag_handle, "fragment shader"); - - // Link - bd->ShaderHandle = glCreateProgram(); - glAttachShader(bd->ShaderHandle, vert_handle); - glAttachShader(bd->ShaderHandle, frag_handle); - glLinkProgram(bd->ShaderHandle); - CheckProgram(bd->ShaderHandle, "shader program"); - - glDetachShader(bd->ShaderHandle, vert_handle); - glDetachShader(bd->ShaderHandle, frag_handle); - glDeleteShader(vert_handle); - glDeleteShader(frag_handle); - - bd->AttribLocationTex = glGetUniformLocation(bd->ShaderHandle, "Texture"); - bd->AttribLocationProjMtx = glGetUniformLocation(bd->ShaderHandle, "ProjMtx"); - bd->AttribLocationVtxPos = (GLuint)glGetAttribLocation(bd->ShaderHandle, "Position"); - bd->AttribLocationVtxUV = (GLuint)glGetAttribLocation(bd->ShaderHandle, "UV"); - bd->AttribLocationVtxColor = (GLuint)glGetAttribLocation(bd->ShaderHandle, "Color"); - - // Create buffers - glGenBuffers(1, &bd->VboHandle); - glGenBuffers(1, &bd->ElementsHandle); - - ImGui_ImplOpenGL3_CreateFontsTexture(); - - // Restore modified GL state - glBindTexture(GL_TEXTURE_2D, last_texture); - glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); -#ifdef IMGUI_IMPL_OPENGL_USE_VERTEX_ARRAY - glBindVertexArray(last_vertex_array); -#endif - - return true; -} - -void ImGui_ImplOpenGL3_DestroyDeviceObjects() -{ - ImGui_ImplOpenGL3_Data* bd = ImGui_ImplOpenGL3_GetBackendData(); - if (bd->VboHandle) { glDeleteBuffers(1, &bd->VboHandle); bd->VboHandle = 0; } - if (bd->ElementsHandle) { glDeleteBuffers(1, &bd->ElementsHandle); bd->ElementsHandle = 0; } - if (bd->ShaderHandle) { glDeleteProgram(bd->ShaderHandle); bd->ShaderHandle = 0; } - ImGui_ImplOpenGL3_DestroyFontsTexture(); -} - -#if defined(__clang__) -#pragma clang diagnostic pop -#endif |