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/* Copyright (c) 2022, 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 <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>
#include <stdlib.h>
Display *display;
int screen;
Window win = 0;
#include <GLES3/gl31.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#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);
}
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