/* Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of NVIDIA CORPORATION nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include Display *display; int screen; Window win = 0; #include #include #include #define GET_GLERROR(ret) \ \ { \ GLenum err = glGetError(); \ if (err != GL_NO_ERROR) { \ fprintf(stderr, "[%s line %d] OpenGL Error: 0x%x\n", __FILE__, __LINE__, \ err); \ fflush(stderr); \ \ switch (err) { \ case GL_INVALID_ENUM: \ printf("GL_INVALID_ENUM\n"); \ break; \ case GL_INVALID_VALUE: \ printf("GL_INVALID_VALUE\n"); \ break; \ case GL_INVALID_OPERATION: \ printf("GL_INVALID_OPERATION\n"); \ break; \ case GL_OUT_OF_MEMORY: \ printf("GL_OUT_OF_MEMORY\n"); \ break; \ case GL_INVALID_FRAMEBUFFER_OPERATION: \ printf("GL_INVALID_FRAMEBUFFER_OPERATION\n"); \ break; \ default: \ printf("UKNOWN OPENGL ERROR CODE 0x%x\n", err); \ }; \ } \ \ } EGLDisplay eglDisplay = EGL_NO_DISPLAY; EGLSurface eglSurface = EGL_NO_SURFACE; EGLContext eglContext = EGL_NO_CONTEXT; int graphics_setup_window(int xpos, int ypos, int width, int height, const char *windowname) { // OpenGL ES 3.1 EGLint configAttrs[] = { EGL_RED_SIZE, 1, EGL_GREEN_SIZE, 1, EGL_BLUE_SIZE, 1, EGL_DEPTH_SIZE, 16, EGL_SAMPLE_BUFFERS, 0, EGL_SAMPLES, 0, // EGL_CONFORMANT, EGL_OPENGL_BIT, EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT, // 3_BIT_KHR, EGL_NONE}; EGLint contextAttrs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE}; EGLConfig *configList = NULL; EGLint configCount; display = XOpenDisplay(NULL); if (!display) error_exit("Error opening X display.\n"); screen = DefaultScreen(display); eglDisplay = eglGetDisplay(0); if (eglDisplay == EGL_NO_DISPLAY) error_exit("EGL failed to obtain display\n"); if (!eglInitialize(eglDisplay, 0, 0)) error_exit("EGL failed to initialize\n"); if (!eglChooseConfig(eglDisplay, configAttrs, NULL, 0, &configCount) || !configCount) error_exit("EGL failed to return any matching configurations\n"); configList = (EGLConfig *)malloc(configCount * sizeof(EGLConfig)); if (!eglChooseConfig(eglDisplay, configAttrs, configList, configCount, &configCount) || !configCount) error_exit("EGL failed to populate configuration list\n"); Window xRootWindow = DefaultRootWindow(display); XSetWindowAttributes xCreateWindowAttributes; xCreateWindowAttributes.event_mask = ExposureMask; win = XCreateWindow(display, xRootWindow, 0, 0, width, height, 0, CopyFromParent, InputOutput, CopyFromParent, CWEventMask, &xCreateWindowAttributes); XMapWindow(display, win); Atom netWmStateAtom = XInternAtom(display, "_NET_WM_STATE", false); XEvent xEvent; memset(&xEvent, 0, sizeof(xEvent)); xEvent.type = ClientMessage; xEvent.xclient.window = win; xEvent.xclient.message_type = netWmStateAtom; xEvent.xclient.format = 32; xEvent.xclient.data.l[0] = 1; xEvent.xclient.data.l[1] = false; XSendEvent(display, xRootWindow, false, SubstructureNotifyMask, &xEvent); XStoreName(display, win, windowname); XSelectInput(display, win, ExposureMask | KeyPressMask | ButtonPressMask | ButtonReleaseMask | KeyReleaseMask | VisibilityChangeMask | PointerMotionMask); EGLint windowAttrs[] = {EGL_NONE}; eglSurface = eglCreateWindowSurface(eglDisplay, configList[0], (EGLNativeWindowType)win, windowAttrs); if (!eglSurface) error_exit("EGL couldn't create window\n"); eglBindAPI(EGL_OPENGL_ES_API); eglContext = eglCreateContext(eglDisplay, configList[0], NULL, contextAttrs); if (!eglContext) error_exit("EGL couldn't create context\n"); if (!eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext)) error_exit("EGL couldn't make context/surface current\n"); EGLint Context_RendererType; eglQueryContext(eglDisplay, eglContext, EGL_CONTEXT_CLIENT_TYPE, &Context_RendererType); switch (Context_RendererType) { case EGL_OPENGL_API: printf("Using OpenGL API is not supported\n"); exit(EXIT_FAILURE); break; case EGL_OPENGL_ES_API: printf("Using OpenGL ES API"); break; case EGL_OPENVG_API: error_exit("Context Query Returned OpenVG. This is Unsupported\n"); default: error_exit("Unknown Context Type. %04X\n", Context_RendererType); } return 1; } void graphics_set_windowtitle(const char *windowname) { XStoreName(display, win, windowname); } void graphics_swap_buffers() { eglSwapBuffers(eglDisplay, eglSurface); } void graphics_close_window() { if (eglDisplay != EGL_NO_DISPLAY) { eglMakeCurrent(eglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); if (eglContext != EGL_NO_CONTEXT) eglDestroyContext(eglDisplay, eglContext); if (eglSurface != EGL_NO_SURFACE) eglDestroySurface(eglDisplay, eglSurface); eglTerminate(eglDisplay); } if (win) XDestroyWindow(display, win); XCloseDisplay(display); }