mirror of
https://github.com/Cuteminded/jellyframe.git
synced 2026-10-18 20:00:29 +02:00
160 lines
8.4 KiB
C++
160 lines
8.4 KiB
C++
#include "shared_gl_context.h"
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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#include <GL/glx.h>
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#include <GL/glxext.h>
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#include <dlfcn.h>
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#include <cstring>
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struct SharedGlContext::Native {
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void *library = nullptr;
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void *x11 = nullptr;
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bool egl = false;
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EGLDisplay egl_display = EGL_NO_DISPLAY;
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EGLContext egl_context = EGL_NO_CONTEXT;
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EGLSurface egl_surface = EGL_NO_SURFACE;
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Display *glx_display = nullptr;
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GLXContext glx_context = nullptr;
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GLXPbuffer glx_surface = 0;
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decltype(&eglGetProcAddress) egl_proc = nullptr;
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decltype(&eglMakeCurrent) egl_make_current = nullptr;
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decltype(&eglDestroyContext) egl_destroy_context = nullptr;
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decltype(&eglDestroySurface) egl_destroy_surface = nullptr;
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decltype(&glXGetProcAddressARB) glx_proc = nullptr;
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decltype(&glXMakeContextCurrent) glx_make_current = nullptr;
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decltype(&glXDestroyContext) glx_destroy_context = nullptr;
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decltype(&glXDestroyPbuffer) glx_destroy_surface = nullptr;
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template<class T> T symbol(const char *name) const { return reinterpret_cast<T>(dlsym(library, name)); }
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void *resolve(const char *name) const {
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void *address = nullptr;
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if (egl_proc) address = reinterpret_cast<void *>(egl_proc(name));
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if (glx_proc) address = reinterpret_cast<void *>(glx_proc(reinterpret_cast<const GLubyte *>(name)));
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return address ? address : dlsym(library, name);
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}
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bool create_egl(EGLContext parent) {
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auto get_display = symbol<decltype(&eglGetCurrentDisplay)>("eglGetCurrentDisplay");
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auto query = symbol<decltype(&eglQueryContext)>("eglQueryContext");
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auto choose = symbol<decltype(&eglChooseConfig)>("eglChooseConfig");
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auto create_context = symbol<decltype(&eglCreateContext)>("eglCreateContext");
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auto create_surface = symbol<decltype(&eglCreatePbufferSurface)>("eglCreatePbufferSurface");
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auto query_string = symbol<decltype(&eglQueryString)>("eglQueryString");
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egl_proc = symbol<decltype(egl_proc)>("eglGetProcAddress");
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egl_make_current = symbol<decltype(egl_make_current)>("eglMakeCurrent");
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egl_destroy_context = symbol<decltype(egl_destroy_context)>("eglDestroyContext");
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egl_destroy_surface = symbol<decltype(egl_destroy_surface)>("eglDestroySurface");
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if (!get_display || !query || !choose || !create_context || !create_surface || !query_string ||
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!egl_proc || !egl_make_current || !egl_destroy_context || !egl_destroy_surface) return false;
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egl = true;
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egl_display = get_display();
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EGLint config_id = 0;
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EGLint api = 0;
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if (!query(egl_display, parent, EGL_CONFIG_ID, &config_id) ||
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!query(egl_display, parent, EGL_CONTEXT_CLIENT_TYPE, &api) || api != EGL_OPENGL_API) return false;
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const EGLint config_attributes[] = {EGL_CONFIG_ID, config_id, EGL_SURFACE_TYPE, 0,
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EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT, EGL_NONE};
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EGLConfig config = nullptr;
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EGLint count = 0;
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if (!choose(egl_display, config_attributes, &config, 1, &count) || count != 1) return false;
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const EGLint attributes[] = {EGL_CONTEXT_MAJOR_VERSION, 3, EGL_CONTEXT_MINOR_VERSION, 3,
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EGL_CONTEXT_OPENGL_PROFILE_MASK, EGL_CONTEXT_OPENGL_CORE_PROFILE_BIT, EGL_NONE};
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egl_context = create_context(egl_display, config, parent, attributes);
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if (egl_context == EGL_NO_CONTEXT) return false;
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const EGLint surface_attributes[] = {EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE};
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egl_surface = create_surface(egl_display, config, surface_attributes);
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const char *extensions = query_string(egl_display, EGL_EXTENSIONS);
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return egl_surface != EGL_NO_SURFACE || (extensions && std::strstr(extensions, "EGL_KHR_surfaceless_context"));
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}
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bool create_glx() {
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library = dlopen("libGL.so.1", RTLD_NOW | RTLD_LOCAL);
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if (!library) return false;
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auto get_context = symbol<decltype(&glXGetCurrentContext)>("glXGetCurrentContext");
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auto get_display = symbol<decltype(&glXGetCurrentDisplay)>("glXGetCurrentDisplay");
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auto query = symbol<decltype(&glXQueryContext)>("glXQueryContext");
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auto choose = symbol<decltype(&glXChooseFBConfig)>("glXChooseFBConfig");
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auto config_attribute = symbol<decltype(&glXGetFBConfigAttrib)>("glXGetFBConfigAttrib");
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auto create_surface = symbol<decltype(&glXCreatePbuffer)>("glXCreatePbuffer");
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glx_proc = symbol<decltype(glx_proc)>("glXGetProcAddressARB");
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glx_make_current = symbol<decltype(glx_make_current)>("glXMakeContextCurrent");
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glx_destroy_context = symbol<decltype(glx_destroy_context)>("glXDestroyContext");
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glx_destroy_surface = symbol<decltype(glx_destroy_surface)>("glXDestroyPbuffer");
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if (!get_context || !get_display || !query || !choose || !config_attribute || !create_surface ||
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!glx_proc || !glx_make_current || !glx_destroy_context || !glx_destroy_surface) return false;
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GLXContext parent = get_context();
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if (!parent) return false;
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glx_display = get_display();
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int config_id = 0;
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int screen = 0;
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if (query(glx_display, parent, GLX_FBCONFIG_ID, &config_id) || query(glx_display, parent, GLX_SCREEN, &screen)) return false;
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x11 = dlopen("libX11.so.6", RTLD_NOW | RTLD_LOCAL);
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auto free_configs = x11 ? reinterpret_cast<int (*)(void *)>(dlsym(x11, "XFree")) : nullptr;
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if (!free_configs) return false;
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const int config_attributes[] = {GLX_FBCONFIG_ID, config_id, None};
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int count = 0;
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GLXFBConfig *configs = choose(glx_display, screen, config_attributes, &count);
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if (!configs || count < 1) { if (configs) free_configs(configs); return false; }
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int drawable_types = 0;
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config_attribute(glx_display, configs[0], GLX_DRAWABLE_TYPE, &drawable_types);
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auto create_context = reinterpret_cast<PFNGLXCREATECONTEXTATTRIBSARBPROC>(resolve("glXCreateContextAttribsARB"));
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if (create_context && (drawable_types & GLX_PBUFFER_BIT)) {
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const int attributes[] = {GLX_CONTEXT_MAJOR_VERSION_ARB, 3, GLX_CONTEXT_MINOR_VERSION_ARB, 3,
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GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB, None};
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glx_context = create_context(glx_display, configs[0], parent, True, attributes);
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const int surface_attributes[] = {GLX_PBUFFER_WIDTH, 1, GLX_PBUFFER_HEIGHT, 1, None};
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if (glx_context) glx_surface = create_surface(glx_display, configs[0], surface_attributes);
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}
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free_configs(configs);
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return glx_context && glx_surface;
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}
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bool create() {
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library = dlopen("libEGL.so.1", RTLD_NOW | RTLD_LOCAL);
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if (library) {
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auto current = symbol<decltype(&eglGetCurrentContext)>("eglGetCurrentContext");
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EGLContext parent = current ? current() : EGL_NO_CONTEXT;
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if (parent != EGL_NO_CONTEXT) return create_egl(parent);
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dlclose(library);
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library = nullptr;
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}
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return create_glx();
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}
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bool activate() {
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if (egl) {
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auto bind_api = symbol<decltype(&eglBindAPI)>("eglBindAPI");
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return bind_api && bind_api(EGL_OPENGL_API) && egl_make_current(egl_display, egl_surface, egl_surface, egl_context);
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}
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return glx_make_current(glx_display, glx_surface, glx_surface, glx_context);
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}
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void release() {
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if (egl) egl_make_current(egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
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else glx_make_current(glx_display, None, None, nullptr);
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}
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~Native() {
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if (egl_context != EGL_NO_CONTEXT) egl_destroy_context(egl_display, egl_context);
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if (egl_surface != EGL_NO_SURFACE) egl_destroy_surface(egl_display, egl_surface);
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if (glx_context) glx_destroy_context(glx_display, glx_context);
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if (glx_surface) glx_destroy_surface(glx_display, glx_surface);
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if (x11) dlclose(x11);
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if (library) dlclose(library);
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}
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};
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SharedGlContext::SharedGlContext() = default;
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SharedGlContext::~SharedGlContext() = default;
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bool SharedGlContext::create() {
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native = std::make_unique<Native>();
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if (native->create()) return true;
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destroy();
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return false;
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}
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bool SharedGlContext::activate() { return native && native->activate(); }
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void SharedGlContext::release() { native->release(); }
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void SharedGlContext::destroy() { native.reset(); }
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void *SharedGlContext::resolve(const char *name) const { return native ? native->resolve(name) : nullptr; }
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