diff --git a/ImGui/impls/imgui_impl_opengl3.cpp b/ImGui/impls/imgui_impl_opengl3.cpp new file mode 100644 index 00000000..9585215c --- /dev/null +++ b/ImGui/impls/imgui_impl_opengl3.cpp @@ -0,0 +1,632 @@ +// dear imgui: Renderer for modern OpenGL with shaders / programmatic pipeline +// - Desktop GL: 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 Binding (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 in imgui.cpp. +// [x] Renderer: Desktop GL only: Support for large meshes (64k+ vertices) with 16-bits indices. + +// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this. +// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp. +// https://github.com/ocornut/imgui + +// CHANGELOG +// (minor and older changes stripped away, please see git history for details) +// 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 dummy 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 +#if defined(_MSC_VER) && _MSC_VER <= 1500 // MSVC 2008 or earlier +#include // intptr_t +#else +#include // intptr_t +#endif +#if defined(__APPLE__) +#include "TargetConditionals.h" +#endif + +// Auto-detect GL version +#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) +#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) || (defined(__ANDROID__)) +#define IMGUI_IMPL_OPENGL_ES3 // iOS, Android -> GL ES 3, "#version 300 es" +#elif defined(__EMSCRIPTEN__) +#define IMGUI_IMPL_OPENGL_ES2 // Emscripten -> GL ES 2, "#version 100" +#endif +#endif + +#if defined(IMGUI_IMPL_OPENGL_ES2) +#include +#elif defined(IMGUI_IMPL_OPENGL_ES3) +#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) +#include // Use GL ES 3 +#else +#include // Use GL ES 3 +#endif +#else +// About Desktop OpenGL function loaders: +// 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 supporting a few common ones (gl3w, glew, glad). +// You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own. +#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W) +#include // Needs to be initialized with gl3wInit() in user's code +#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW) +#include // Needs to be initialized with glewInit() in user's code +#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD) +#include // Needs to be initialized with gladLoadGL() in user's code +#else +#include IMGUI_IMPL_OPENGL_LOADER_CUSTOM +#endif +#endif + +// Desktop GL has glDrawElementsBaseVertex() which GL ES and WebGL don't have. +#if defined(IMGUI_IMPL_OPENGL_ES2) || defined(IMGUI_IMPL_OPENGL_ES3) +#define IMGUI_IMPL_OPENGL_HAS_DRAW_WITH_BASE_VERTEX 0 +#else +#define IMGUI_IMPL_OPENGL_HAS_DRAW_WITH_BASE_VERTEX 1 +#endif + +// OpenGL Data +static char g_GlslVersionString[32] = ""; +static GLuint g_FontTexture = 0; +static GLuint g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0; +static int g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0; // Uniforms location +static int g_AttribLocationVtxPos = 0, g_AttribLocationVtxUV = 0, g_AttribLocationVtxColor = 0; // Vertex attributes location +static unsigned int g_VboHandle = 0, g_ElementsHandle = 0; + +// Functions +bool ImGui_ImplOpenGL3_Init(const char* glsl_version) +{ + // Setup back-end capabilities flags + ImGuiIO& io = ImGui::GetIO(); + io.BackendRendererName = "imgui_impl_opengl3"; +#if IMGUI_IMPL_OPENGL_HAS_DRAW_WITH_BASE_VERTEX + 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 defined(IMGUI_IMPL_OPENGL_ES2) + if (glsl_version == NULL) + glsl_version = "#version 100"; +#elif defined(IMGUI_IMPL_OPENGL_ES3) + if (glsl_version == NULL) + glsl_version = "#version 300 es"; +#else + if (glsl_version == NULL) + glsl_version = "#version 130"; +#endif + IM_ASSERT((int)strlen(glsl_version) + 2 < IM_ARRAYSIZE(g_GlslVersionString)); + strcpy(g_GlslVersionString, glsl_version); + strcat(g_GlslVersionString, "\n"); + + // Make a dummy GL call (we don't actually need the result) + // IF YOU GET A CRASH HERE: it probably means that you haven't initialized the OpenGL function loader used by this code. + // Desktop OpenGL 3/4 need a function loader. See the IMGUI_IMPL_OPENGL_LOADER_xxx explanation above. + GLint current_texture; + glGetIntegerv(GL_TEXTURE_BINDING_2D, ¤t_texture); + + return true; +} + +void ImGui_ImplOpenGL3_Shutdown() +{ + ImGui_ImplOpenGL3_DestroyDeviceObjects(); +} + +void ImGui_ImplOpenGL3_NewFrame() +{ + if (!g_FontTexture) + ImGui_ImplOpenGL3_CreateDeviceObjects(); +} + +static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height, GLuint vertex_array_object) +{ + // 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); +#ifdef GL_POLYGON_MODE + glPolygonMode(GL_FRONT_AND_BACK, GL_FILL); +#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; + 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(g_ShaderHandle); + glUniform1i(g_AttribLocationTex, 0); + glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]); +#ifdef GL_SAMPLER_BINDING + glBindSampler(0, 0); // We use combined texture/sampler state. Applications using GL 3.3 may set that otherwise. +#endif + + (void)vertex_array_object; +#ifndef IMGUI_IMPL_OPENGL_ES2 + glBindVertexArray(vertex_array_object); +#endif + + // Bind vertex/index buffers and setup attributes for ImDrawVert + glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle); + glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle); + glEnableVertexAttribArray(g_AttribLocationVtxPos); + glEnableVertexAttribArray(g_AttribLocationVtxUV); + glEnableVertexAttribArray(g_AttribLocationVtxColor); + glVertexAttribPointer(g_AttribLocationVtxPos, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, pos)); + glVertexAttribPointer(g_AttribLocationVtxUV, 2, GL_FLOAT, GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, uv)); + glVertexAttribPointer(g_AttribLocationVtxColor, 4, GL_UNSIGNED_BYTE, GL_TRUE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, col)); +} + +// OpenGL3 Render function. +// (this used to be set in io.RenderDrawListsFn and called by ImGui::Render(), but you can now call this directly from your main loop) +// 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. +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; + + // 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); +#ifdef GL_SAMPLER_BINDING + GLint last_sampler; glGetIntegerv(GL_SAMPLER_BINDING, &last_sampler); +#endif + GLint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); +#ifndef IMGUI_IMPL_OPENGL_ES2 + GLint last_vertex_array_object; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array_object); +#endif +#ifdef GL_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_scissor_test = glIsEnabled(GL_SCISSOR_TEST); + bool clip_origin_lower_left = true; +#if defined(GL_CLIP_ORIGIN) && !defined(__APPLE__) + GLenum last_clip_origin = 0; glGetIntegerv(GL_CLIP_ORIGIN, (GLint*)&last_clip_origin); // Support for GL 4.5's glClipControl(GL_UPPER_LEFT) + if (last_clip_origin == GL_UPPER_LEFT) + clip_origin_lower_left = 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; +#ifndef IMGUI_IMPL_OPENGL_ES2 + 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 + glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.Size * sizeof(ImDrawVert), (const GLvoid*)cmd_list->VtxBuffer.Data, GL_STREAM_DRAW); + 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 != 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 + ImVec4 clip_rect; + clip_rect.x = (pcmd->ClipRect.x - clip_off.x) * clip_scale.x; + clip_rect.y = (pcmd->ClipRect.y - clip_off.y) * clip_scale.y; + clip_rect.z = (pcmd->ClipRect.z - clip_off.x) * clip_scale.x; + clip_rect.w = (pcmd->ClipRect.w - clip_off.y) * clip_scale.y; + + if (clip_rect.x < fb_width && clip_rect.y < fb_height && clip_rect.z >= 0.0f && clip_rect.w >= 0.0f) + { + // Apply scissor/clipping rectangle + if (clip_origin_lower_left) + glScissor((int)clip_rect.x, (int)(fb_height - clip_rect.w), (int)(clip_rect.z - clip_rect.x), (int)(clip_rect.w - clip_rect.y)); + else + glScissor((int)clip_rect.x, (int)clip_rect.y, (int)clip_rect.z, (int)clip_rect.w); // Support for GL 4.5 rarely used glClipControl(GL_UPPER_LEFT) + + // Bind texture, Draw + glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId); +#if IMGUI_IMPL_OPENGL_HAS_DRAW_WITH_BASE_VERTEX + 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 + glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx))); +#endif + } + } + } + } + + // Destroy the temporary VAO +#ifndef IMGUI_IMPL_OPENGL_ES2 + glDeleteVertexArrays(1, &vertex_array_object); +#endif + + // Restore modified GL state + glUseProgram(last_program); + glBindTexture(GL_TEXTURE_2D, last_texture); +#ifdef GL_SAMPLER_BINDING + glBindSampler(0, last_sampler); +#endif + glActiveTexture(last_active_texture); +#ifndef IMGUI_IMPL_OPENGL_ES2 + 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_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST); +#ifdef GL_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]); +} + +bool ImGui_ImplOpenGL3_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 (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, &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); +#ifdef GL_UNPACK_ROW_LENGTH + 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->TexID = (ImTextureID)(intptr_t)g_FontTexture; + + // Restore state + glBindTexture(GL_TEXTURE_2D, last_texture); + + return true; +} + +void ImGui_ImplOpenGL3_DestroyFontsTexture() +{ + if (g_FontTexture) + { + ImGuiIO& io = ImGui::GetIO(); + glDeleteTextures(1, &g_FontTexture); + io.Fonts->TexID = 0; + g_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) +{ + 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!\n", desc); + if (log_length > 1) + { + ImVector 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) +{ + 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, g_GlslVersionString); + if (log_length > 1) + { + ImVector 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() +{ + // Backup GL state + GLint last_texture, last_array_buffer; + glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture); + glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer); +#ifndef IMGUI_IMPL_OPENGL_ES2 + GLint last_vertex_array; + glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array); +#endif + + // Parse GLSL version string + int glsl_version = 130; + sscanf(g_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 mediump 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] = { g_GlslVersionString, vertex_shader }; + g_VertHandle = glCreateShader(GL_VERTEX_SHADER); + glShaderSource(g_VertHandle, 2, vertex_shader_with_version, NULL); + glCompileShader(g_VertHandle); + CheckShader(g_VertHandle, "vertex shader"); + + const GLchar* fragment_shader_with_version[2] = { g_GlslVersionString, fragment_shader }; + g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER); + glShaderSource(g_FragHandle, 2, fragment_shader_with_version, NULL); + glCompileShader(g_FragHandle); + CheckShader(g_FragHandle, "fragment shader"); + + g_ShaderHandle = glCreateProgram(); + glAttachShader(g_ShaderHandle, g_VertHandle); + glAttachShader(g_ShaderHandle, g_FragHandle); + glLinkProgram(g_ShaderHandle); + CheckProgram(g_ShaderHandle, "shader program"); + + g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture"); + g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx"); + g_AttribLocationVtxPos = glGetAttribLocation(g_ShaderHandle, "Position"); + g_AttribLocationVtxUV = glGetAttribLocation(g_ShaderHandle, "UV"); + g_AttribLocationVtxColor = glGetAttribLocation(g_ShaderHandle, "Color"); + + // Create buffers + glGenBuffers(1, &g_VboHandle); + glGenBuffers(1, &g_ElementsHandle); + + ImGui_ImplOpenGL3_CreateFontsTexture(); + + // Restore modified GL state + glBindTexture(GL_TEXTURE_2D, last_texture); + glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer); +#ifndef IMGUI_IMPL_OPENGL_ES2 + glBindVertexArray(last_vertex_array); +#endif + + return true; +} + +void ImGui_ImplOpenGL3_DestroyDeviceObjects() +{ + if (g_VboHandle) glDeleteBuffers(1, &g_VboHandle); + if (g_ElementsHandle) glDeleteBuffers(1, &g_ElementsHandle); + g_VboHandle = g_ElementsHandle = 0; + + if (g_ShaderHandle && g_VertHandle) glDetachShader(g_ShaderHandle, g_VertHandle); + if (g_VertHandle) glDeleteShader(g_VertHandle); + g_VertHandle = 0; + + if (g_ShaderHandle && g_FragHandle) glDetachShader(g_ShaderHandle, g_FragHandle); + if (g_FragHandle) glDeleteShader(g_FragHandle); + g_FragHandle = 0; + + if (g_ShaderHandle) glDeleteProgram(g_ShaderHandle); + g_ShaderHandle = 0; + + ImGui_ImplOpenGL3_DestroyFontsTexture(); +} diff --git a/ImGui/impls/imgui_impl_opengl3.h b/ImGui/impls/imgui_impl_opengl3.h new file mode 100644 index 00000000..0f7eef74 --- /dev/null +++ b/ImGui/impls/imgui_impl_opengl3.h @@ -0,0 +1,47 @@ +// dear imgui: Renderer for modern OpenGL with shaders / programmatic pipeline +// - Desktop GL: 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 Binding (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 in imgui.cpp. +// [x] Renderer: Desktop GL only: Support for large meshes (64k+ vertices) with 16-bits indices. + +// You can copy and use unmodified imgui_impl_* files in your project. See main.cpp for an example of using this. +// If you are new to dear imgui, read examples/README.txt and read the documentation at the top of imgui.cpp. +// https://github.com/ocornut/imgui + +// About Desktop OpenGL function loaders: +// 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 supporting a few common ones (gl3w, glew, glad). +// You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own. + +// About GLSL version: +// The 'glsl_version' initialization parameter should be NULL (default) or a "#version XXX" string. +// On computer platform the GLSL version default to "#version 130". On OpenGL ES 3 platform it defaults to "#version 300 es" +// Only override if your GL version doesn't handle this GLSL version. See GLSL version table at the top of imgui_impl_opengl3.cpp. + +#pragma once + +// Specific OpenGL versions +//#define IMGUI_IMPL_OPENGL_ES2 // Auto-detected on Emscripten +//#define IMGUI_IMPL_OPENGL_ES3 // Auto-detected on iOS/Android + +// Set default OpenGL3 loader to be gl3w +#if !defined(IMGUI_IMPL_OPENGL_LOADER_GL3W) \ + && !defined(IMGUI_IMPL_OPENGL_LOADER_GLEW) \ + && !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD) \ + && !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM) +#define IMGUI_IMPL_OPENGL_LOADER_GL3W +#endif + +IMGUI_IMPL_API bool ImGui_ImplOpenGL3_Init(const char* glsl_version = NULL); +IMGUI_IMPL_API void ImGui_ImplOpenGL3_Shutdown(); +IMGUI_IMPL_API void ImGui_ImplOpenGL3_NewFrame(); +IMGUI_IMPL_API void ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data); + +// Called by Init/NewFrame/Shutdown +IMGUI_IMPL_API bool ImGui_ImplOpenGL3_CreateFontsTexture(); +IMGUI_IMPL_API void ImGui_ImplOpenGL3_DestroyFontsTexture(); +IMGUI_IMPL_API bool ImGui_ImplOpenGL3_CreateDeviceObjects(); +IMGUI_IMPL_API void ImGui_ImplOpenGL3_DestroyDeviceObjects(); diff --git a/overlay_experimental/Hook_Manager.cpp b/overlay_experimental/Hook_Manager.cpp index d3d2d9c8..32812a4d 100644 --- a/overlay_experimental/Hook_Manager.cpp +++ b/overlay_experimental/Hook_Manager.cpp @@ -7,6 +7,7 @@ #include "DX11_Hook.h" #include "DX10_Hook.h" #include "DX9_Hook.h" +#include "OpenGL_Hook.h" #include @@ -17,26 +18,30 @@ decltype(LoadLibraryExW )* _LoadLibraryExW = LoadLibraryExW; void create_hookA(const char* libname) { - if (!strcmp(libname, "d3d9.dll")) + if (!_stricmp(libname, "d3d9.dll")) DX9_Hook::Create(); - else if (!strcmp(libname, "d3d10.dll")) + else if (!_stricmp(libname, "d3d10.dll")) DX10_Hook::Create(); - else if (!strcmp(libname, "d3d11.dll")) + else if (!_stricmp(libname, "d3d11.dll")) DX11_Hook::Create(); - else if (!strcmp(libname, "d3d12.dll")) + else if (!_stricmp(libname, "d3d12.dll")) DX12_Hook::Create(); + else if (!_stricmp(libname, "opengl32.dll")) + OpenGL_Hook::Create(); } void create_hookW(const wchar_t *libname) { - if (!wcscmp(libname, L"d3d9.dll")) + if (!_wcsicmp(libname, L"d3d9.dll")) DX9_Hook::Create(); - else if (!wcscmp(libname, L"d3d10.dll")) + else if (!_wcsicmp(libname, L"d3d10.dll")) DX10_Hook::Create(); - else if (!wcscmp(libname, L"d3d11.dll")) + else if (!_wcsicmp(libname, L"d3d11.dll")) DX11_Hook::Create(); - else if (!wcscmp(libname, L"d3d12.dll")) + else if (!_wcsicmp(libname, L"d3d12.dll")) DX12_Hook::Create(); + else if (!_wcsicmp(libname, L"opengl32.dll")) + OpenGL_Hook::Create(); } HMODULE WINAPI mLoadLibraryA(LPCTSTR lpLibFileName) @@ -88,7 +93,7 @@ void Hook_Manager::HookRenderer(Steam_Overlay *ovlay) { overlay = ovlay; HookLoadLibrary(); - std::vector const libraries = { "d3d12.dll", "d3d11.dll", "d3d10.dll", "d3d9.dll" }; + std::vector const libraries = { "opengl32.dll", "d3d12.dll", "d3d11.dll", "d3d10.dll", "d3d9.dll" }; std::vector::const_iterator it = libraries.begin(); while (it != libraries.end()) { @@ -102,15 +107,7 @@ void Hook_Manager::HookRenderer(Steam_Overlay *ovlay) if (it == libraries.end()) break; - if (*it == "d3d9.dll") - DX9_Hook::Create(); - else if (*it == "d3d10.dll") - DX10_Hook::Create(); - else if (*it == "d3d11.dll") - DX11_Hook::Create(); - else if (*it == "d3d12.dll") - DX12_Hook::Create(); - + create_hookA(it->c_str()); ++it; } } diff --git a/overlay_experimental/OpenGL_Hook.cpp b/overlay_experimental/OpenGL_Hook.cpp new file mode 100644 index 00000000..6a2adebf --- /dev/null +++ b/overlay_experimental/OpenGL_Hook.cpp @@ -0,0 +1,144 @@ +#include "../dll/base.h" +#include "OpenGL_Hook.h" +#include "Hook_Manager.h" + +#include +#include +#include + +#include + +#pragma comment(lib, "opengl32") +#pragma comment(lib, "glew32s") + + +// This is created by OpenGL_Hook::Create, and deleted by the Hook_Manager if not used +static OpenGL_Hook* hook; + +void OpenGL_Hook::hook_ogl() +{ + if (!_hooked) + { + PRINT_DEBUG("Hooked OpenGL\n"); + _hooked = true; + Hook_Manager::Inst().FoundHook(this); + + GLenum err = glewInit(); + if (GLEW_OK != err) + { + /* Problem: glewInit failed, something is seriously wrong. */ + PRINT_DEBUG("Error: %s\n", glewGetErrorString(err)); + } + + UnhookAll(); + BeginHook(); + HookFuncs( + std::make_pair(&(PVOID&)wglSwapBuffers, &OpenGL_Hook::MywglSwapBuffers) + ); + EndHook(); + } +} + +void OpenGL_Hook::resetRenderState() +{ + if (initialized) + { + ImGui_ImplOpenGL3_Shutdown(); + ImGui_ImplWin32_Shutdown(); + ImGui::DestroyContext(); + + initialized = false; + } +} + +void OpenGL_Hook::prepareForOverlay(HDC hDC) +{ + HWND hWnd = WindowFromDC(hDC); + RECT rect; + + GetClientRect(hWnd, &rect); + + if (!initialized) + { + ImGui::CreateContext(); + ImGuiIO& io = ImGui::GetIO(); + io.IniFilename = NULL; + + Hook_Manager::Inst().ChangeGameWindow(hWnd); + + ImGui_ImplWin32_Init(hWnd); + ImGui_ImplOpenGL3_Init(); + + initialized = true; + } + ImGui_ImplOpenGL3_NewFrame(); + ImGui_ImplWin32_NewFrame(); + + ImGui::NewFrame(); + + Hook_Manager::Inst().CallOverlayProc(rect.right, rect.bottom); + + ImGui::EndFrame(); + + ImGui::Render(); + + ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData()); +} + +///////////////////////////////////////////////////////////////////////////////////// +// OpenGL Initialization functions +BOOL WINAPI OpenGL_Hook::MywglMakeCurrent(HDC hDC, HGLRC hGLRC) +{ + auto res = hook->wglMakeCurrent(hDC, hGLRC); + hook->hook_ogl(); + return res; +} + +///////////////////////////////////////////////////////////////////////////////////// +BOOL WINAPI OpenGL_Hook::MywglSwapBuffers(HDC hDC) +{ + hook->prepareForOverlay(hDC); + return hook->wglSwapBuffers(hDC); +} + +OpenGL_Hook::OpenGL_Hook(): + initialized(false), + wglSwapBuffers(nullptr) +{ + _dll = GetModuleHandle(DLL_NAME); + _hooked = false; + // Hook to wglMakeCurrent so we know when it gets called. + // If its called, then OpenGL will be used to render the overlay. + wglMakeCurrent = (decltype(wglMakeCurrent))GetProcAddress(_dll, "wglMakeCurrent"); + wglSwapBuffers = (decltype(wglSwapBuffers))GetProcAddress(_dll, "wglSwapBuffers"); + + BeginHook(); + HookFuncs( + std::make_pair(&(PVOID&)wglMakeCurrent, &OpenGL_Hook::MywglMakeCurrent) + ); + EndHook(); +} + +OpenGL_Hook::~OpenGL_Hook() +{ + PRINT_DEBUG("OpenGL Hook removed\n"); + + if (_hooked) + { + ImGui_ImplOpenGL3_Shutdown(); + ImGui_ImplWin32_Shutdown(); + ImGui::DestroyContext(); + } + + hook = nullptr; +} + +void OpenGL_Hook::Create() +{ + if (hook == nullptr) + { + hook = new OpenGL_Hook; + // Register the hook to the Hook Manager + Hook_Manager::Inst().AddHook(hook); + } +} \ No newline at end of file diff --git a/overlay_experimental/OpenGL_Hook.h b/overlay_experimental/OpenGL_Hook.h new file mode 100644 index 00000000..ae3df166 --- /dev/null +++ b/overlay_experimental/OpenGL_Hook.h @@ -0,0 +1,41 @@ +#ifndef __INCLUDED_OPENGL_HOOK_H__ +#define __INCLUDED_OPENGL_HOOK_H__ + +#include "DirectX_VTables.h" +#include "Base_Hook.h" + +class OpenGL_Hook : public Base_Hook +{ +public: + static constexpr const char DLL_NAME[] = "opengl32.dll"; + + using wglSwapBuffers_t = BOOL(WINAPI)(HDC); + using wglMakeCurrent_t = BOOL(WINAPI)(HDC, HGLRC); + +private: + // Variables + bool initialized; + + // Functions + OpenGL_Hook(); + virtual ~OpenGL_Hook(); + + void hook_ogl(); + void resetRenderState(); + void prepareForOverlay(HDC hDC); + + // Hook to render functions + static BOOL WINAPI MywglSwapBuffers(HDC hDC); + + wglSwapBuffers_t* wglSwapBuffers; + + // Hook functions so we know we use OGL + static BOOL WINAPI MywglMakeCurrent(HDC hDC, HGLRC hGLRC); + + wglMakeCurrent_t* wglMakeCurrent; + +public: + static void Create(); // Initialize OGL Hook. +}; + +#endif//__INCLUDED_OPENGL_HOOK_H__ \ No newline at end of file