2022-01-13 14:05:24 +08:00
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/* Copyright (c) 2022, NVIDIA CORPORATION. All rights reserved.
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2021-10-21 19:04:49 +08:00
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of NVIDIA CORPORATION nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#include <stdio.h>
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#include <stdlib.h>
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Display *display;
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int screen;
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Window win = 0;
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#include <GLES3/gl31.h>
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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#define GET_GLERROR(ret) \
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\
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{ \
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GLenum err = glGetError(); \
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if (err != GL_NO_ERROR) { \
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fprintf(stderr, "[%s line %d] OpenGL Error: 0x%x\n", __FILE__, __LINE__, \
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err); \
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fflush(stderr); \
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\
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switch (err) { \
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case GL_INVALID_ENUM: \
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printf("GL_INVALID_ENUM\n"); \
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break; \
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case GL_INVALID_VALUE: \
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printf("GL_INVALID_VALUE\n"); \
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break; \
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case GL_INVALID_OPERATION: \
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printf("GL_INVALID_OPERATION\n"); \
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break; \
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case GL_OUT_OF_MEMORY: \
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printf("GL_OUT_OF_MEMORY\n"); \
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break; \
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case GL_INVALID_FRAMEBUFFER_OPERATION: \
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printf("GL_INVALID_FRAMEBUFFER_OPERATION\n"); \
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break; \
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default: \
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printf("UKNOWN OPENGL ERROR CODE 0x%x\n", err); \
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}; \
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} \
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\
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}
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EGLDisplay eglDisplay = EGL_NO_DISPLAY;
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EGLSurface eglSurface = EGL_NO_SURFACE;
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EGLContext eglContext = EGL_NO_CONTEXT;
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int graphics_setup_window(int xpos, int ypos, int width, int height,
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const char *windowname) {
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// OpenGL ES 3.1
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EGLint configAttrs[] = {
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EGL_RED_SIZE, 1, EGL_GREEN_SIZE, 1, EGL_BLUE_SIZE, 1, EGL_DEPTH_SIZE, 16,
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EGL_SAMPLE_BUFFERS, 0, EGL_SAMPLES, 0,
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// EGL_CONFORMANT, EGL_OPENGL_BIT,
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EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT, // 3_BIT_KHR,
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EGL_NONE};
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EGLint contextAttrs[] = {EGL_CONTEXT_CLIENT_VERSION, 3, EGL_NONE};
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EGLConfig *configList = NULL;
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EGLint configCount;
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display = XOpenDisplay(NULL);
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if (!display) error_exit("Error opening X display.\n");
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screen = DefaultScreen(display);
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eglDisplay = eglGetDisplay(0);
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if (eglDisplay == EGL_NO_DISPLAY)
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error_exit("EGL failed to obtain display\n");
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if (!eglInitialize(eglDisplay, 0, 0))
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error_exit("EGL failed to initialize\n");
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if (!eglChooseConfig(eglDisplay, configAttrs, NULL, 0, &configCount) ||
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!configCount)
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error_exit("EGL failed to return any matching configurations\n");
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configList = (EGLConfig *)malloc(configCount * sizeof(EGLConfig));
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if (!eglChooseConfig(eglDisplay, configAttrs, configList, configCount,
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&configCount) ||
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!configCount)
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error_exit("EGL failed to populate configuration list\n");
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Window xRootWindow = DefaultRootWindow(display);
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XSetWindowAttributes xCreateWindowAttributes;
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xCreateWindowAttributes.event_mask = ExposureMask;
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win = XCreateWindow(display, xRootWindow, 0, 0, width, height, 0,
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CopyFromParent, InputOutput, CopyFromParent, CWEventMask,
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&xCreateWindowAttributes);
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XMapWindow(display, win);
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Atom netWmStateAtom = XInternAtom(display, "_NET_WM_STATE", false);
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XEvent xEvent;
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memset(&xEvent, 0, sizeof(xEvent));
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xEvent.type = ClientMessage;
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xEvent.xclient.window = win;
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xEvent.xclient.message_type = netWmStateAtom;
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xEvent.xclient.format = 32;
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xEvent.xclient.data.l[0] = 1;
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xEvent.xclient.data.l[1] = false;
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XSendEvent(display, xRootWindow, false, SubstructureNotifyMask, &xEvent);
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XStoreName(display, win, windowname);
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XSelectInput(display, win, ExposureMask | KeyPressMask | ButtonPressMask |
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ButtonReleaseMask | KeyReleaseMask |
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VisibilityChangeMask | PointerMotionMask);
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EGLint windowAttrs[] = {EGL_NONE};
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eglSurface = eglCreateWindowSurface(eglDisplay, configList[0],
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(EGLNativeWindowType)win, windowAttrs);
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if (!eglSurface) error_exit("EGL couldn't create window\n");
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eglBindAPI(EGL_OPENGL_ES_API);
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eglContext = eglCreateContext(eglDisplay, configList[0], NULL, contextAttrs);
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if (!eglContext) error_exit("EGL couldn't create context\n");
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if (!eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext))
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error_exit("EGL couldn't make context/surface current\n");
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EGLint Context_RendererType;
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eglQueryContext(eglDisplay, eglContext, EGL_CONTEXT_CLIENT_TYPE,
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&Context_RendererType);
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switch (Context_RendererType) {
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case EGL_OPENGL_API:
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printf("Using OpenGL API is not supported\n");
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exit(EXIT_FAILURE);
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break;
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case EGL_OPENGL_ES_API:
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printf("Using OpenGL ES API");
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break;
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case EGL_OPENVG_API:
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error_exit("Context Query Returned OpenVG. This is Unsupported\n");
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default:
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error_exit("Unknown Context Type. %04X\n", Context_RendererType);
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}
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return 1;
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}
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void graphics_set_windowtitle(const char *windowname) {
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XStoreName(display, win, windowname);
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}
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void graphics_swap_buffers() { eglSwapBuffers(eglDisplay, eglSurface); }
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void graphics_close_window() {
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if (eglDisplay != EGL_NO_DISPLAY) {
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eglMakeCurrent(eglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
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if (eglContext != EGL_NO_CONTEXT) eglDestroyContext(eglDisplay, eglContext);
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if (eglSurface != EGL_NO_SURFACE) eglDestroySurface(eglDisplay, eglSurface);
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eglTerminate(eglDisplay);
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}
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if (win) XDestroyWindow(display, win);
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XCloseDisplay(display);
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}
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