362 lines
8.8 KiB
C
362 lines
8.8 KiB
C
/*
|
|
* Copyright (C) 2008 Brian Paul All Rights Reserved.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a
|
|
* copy of this software and associated documentation files (the "Software"),
|
|
* to deal in the Software without restriction, including without limitation
|
|
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
|
* and/or sell copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included
|
|
* in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
|
|
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
|
|
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
/*
|
|
* Draw a triangle with X/EGL.
|
|
* Brian Paul
|
|
* 3 June 2008
|
|
*/
|
|
|
|
|
|
#include <assert.h>
|
|
#include <math.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <X11/Xlib.h>
|
|
#include <X11/Xutil.h>
|
|
#include <X11/keysym.h>
|
|
#include <GL/gl.h> /* using full OpenGL for now */
|
|
#include <GLES/egl.h>
|
|
|
|
|
|
static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0;
|
|
|
|
|
|
static void
|
|
draw(void)
|
|
{
|
|
static const GLfloat verts[3][2] = {
|
|
{ -1, -1 },
|
|
{ 1, -1 },
|
|
{ 0, 1 }
|
|
};
|
|
static const GLfloat colors[3][3] = {
|
|
{ 1, 0, 0 },
|
|
{ 0, 1, 0 },
|
|
{ 0, 0, 1 }
|
|
};
|
|
|
|
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
|
|
|
glPushMatrix();
|
|
glRotatef(view_rotx, 1, 0, 0);
|
|
glRotatef(view_roty, 0, 1, 0);
|
|
glRotatef(view_rotz, 0, 0, 1);
|
|
|
|
{
|
|
glVertexPointer(2, GL_FLOAT, 0, verts);
|
|
glColorPointer(3, GL_FLOAT, 0, colors);
|
|
glEnableClientState(GL_VERTEX_ARRAY);
|
|
glEnableClientState(GL_COLOR_ARRAY);
|
|
|
|
glDrawArrays(GL_TRIANGLES, 0, 3);
|
|
|
|
glDisableClientState(GL_VERTEX_ARRAY);
|
|
glDisableClientState(GL_COLOR_ARRAY);
|
|
}
|
|
|
|
glPopMatrix();
|
|
}
|
|
|
|
|
|
/* new window size or exposure */
|
|
static void
|
|
reshape(int width, int height)
|
|
{
|
|
GLfloat ar = (GLfloat) width / (GLfloat) height;
|
|
|
|
glViewport(0, 0, (GLint) width, (GLint) height);
|
|
|
|
glMatrixMode(GL_PROJECTION);
|
|
glLoadIdentity();
|
|
glFrustum(-ar, ar, -1, 1, 5.0, 60.0);
|
|
|
|
glMatrixMode(GL_MODELVIEW);
|
|
glLoadIdentity();
|
|
glTranslatef(0.0, 0.0, -10.0);
|
|
}
|
|
|
|
|
|
static void
|
|
init(void)
|
|
{
|
|
glClearColor(0.4, 0.4, 0.4, 0.0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Create an RGB, double-buffered X window.
|
|
* Return the window and context handles.
|
|
*/
|
|
static void
|
|
make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
|
|
const char *name,
|
|
int x, int y, int width, int height,
|
|
Window *winRet,
|
|
EGLContext *ctxRet,
|
|
EGLSurface *surfRet)
|
|
{
|
|
static const EGLint attribs[] = {
|
|
EGL_RED_SIZE, 1,
|
|
EGL_GREEN_SIZE, 1,
|
|
EGL_BLUE_SIZE, 1,
|
|
EGL_DEPTH_SIZE, 1,
|
|
EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
|
|
EGL_NONE
|
|
};
|
|
|
|
int scrnum;
|
|
XSetWindowAttributes attr;
|
|
unsigned long mask;
|
|
Window root;
|
|
Window win;
|
|
XVisualInfo *visInfo, visTemplate;
|
|
int num_visuals;
|
|
EGLContext ctx;
|
|
EGLConfig config;
|
|
EGLint num_configs;
|
|
EGLint vid;
|
|
|
|
scrnum = DefaultScreen( x_dpy );
|
|
root = RootWindow( x_dpy, scrnum );
|
|
|
|
if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs) ||
|
|
!num_configs) {
|
|
printf("Error: couldn't get an EGL visual config\n");
|
|
exit(1);
|
|
}
|
|
|
|
assert(config);
|
|
assert(num_configs > 0);
|
|
|
|
if (!eglGetConfigAttrib(egl_dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) {
|
|
printf("Error: eglGetConfigAttrib() failed\n");
|
|
exit(1);
|
|
}
|
|
|
|
/* The X window visual must match the EGL config */
|
|
visTemplate.visualid = vid;
|
|
visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals);
|
|
if (!visInfo) {
|
|
printf("Error: couldn't get X visual\n");
|
|
exit(1);
|
|
}
|
|
|
|
/* window attributes */
|
|
attr.background_pixel = 0;
|
|
attr.border_pixel = 0;
|
|
attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone);
|
|
attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
|
|
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
|
|
|
|
win = XCreateWindow( x_dpy, root, 0, 0, width, height,
|
|
0, visInfo->depth, InputOutput,
|
|
visInfo->visual, mask, &attr );
|
|
|
|
/* set hints and properties */
|
|
{
|
|
XSizeHints sizehints;
|
|
sizehints.x = x;
|
|
sizehints.y = y;
|
|
sizehints.width = width;
|
|
sizehints.height = height;
|
|
sizehints.flags = USSize | USPosition;
|
|
XSetNormalHints(x_dpy, win, &sizehints);
|
|
XSetStandardProperties(x_dpy, win, name, name,
|
|
None, (char **)NULL, 0, &sizehints);
|
|
}
|
|
|
|
eglBindAPI(EGL_OPENGL_API);
|
|
|
|
ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
|
|
if (!ctx) {
|
|
printf("Error: glXCreateContext failed\n");
|
|
exit(1);
|
|
}
|
|
|
|
*surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
|
|
|
|
if (!*surfRet) {
|
|
printf("Error: eglCreateWindowSurface failed\n");
|
|
exit(1);
|
|
}
|
|
|
|
XFree(visInfo);
|
|
|
|
*winRet = win;
|
|
*ctxRet = ctx;
|
|
}
|
|
|
|
|
|
static void
|
|
event_loop(Display *dpy, Window win,
|
|
EGLDisplay egl_dpy, EGLSurface egl_surf)
|
|
{
|
|
while (1) {
|
|
int redraw = 0;
|
|
XEvent event;
|
|
|
|
XNextEvent(dpy, &event);
|
|
|
|
switch (event.type) {
|
|
case Expose:
|
|
redraw = 1;
|
|
break;
|
|
case ConfigureNotify:
|
|
reshape(event.xconfigure.width, event.xconfigure.height);
|
|
break;
|
|
case KeyPress:
|
|
{
|
|
char buffer[10];
|
|
int r, code;
|
|
code = XLookupKeysym(&event.xkey, 0);
|
|
if (code == XK_Left) {
|
|
view_roty += 5.0;
|
|
}
|
|
else if (code == XK_Right) {
|
|
view_roty -= 5.0;
|
|
}
|
|
else if (code == XK_Up) {
|
|
view_rotx += 5.0;
|
|
}
|
|
else if (code == XK_Down) {
|
|
view_rotx -= 5.0;
|
|
}
|
|
else {
|
|
r = XLookupString(&event.xkey, buffer, sizeof(buffer),
|
|
NULL, NULL);
|
|
if (buffer[0] == 27) {
|
|
/* escape */
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
redraw = 1;
|
|
break;
|
|
default:
|
|
; /*no-op*/
|
|
}
|
|
|
|
if (redraw) {
|
|
draw();
|
|
eglSwapBuffers(egl_dpy, egl_surf);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
printf("Usage:\n");
|
|
printf(" -display <displayname> set the display to run on\n");
|
|
printf(" -info display OpenGL renderer info\n");
|
|
}
|
|
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
const int winWidth = 300, winHeight = 300;
|
|
Display *x_dpy;
|
|
Window win;
|
|
EGLSurface egl_surf;
|
|
EGLContext egl_ctx;
|
|
EGLDisplay egl_dpy;
|
|
char *dpyName = NULL;
|
|
GLboolean printInfo = GL_FALSE;
|
|
EGLint egl_major, egl_minor;
|
|
int i;
|
|
const char *s;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
if (strcmp(argv[i], "-display") == 0) {
|
|
dpyName = argv[i+1];
|
|
i++;
|
|
}
|
|
else if (strcmp(argv[i], "-info") == 0) {
|
|
printInfo = GL_TRUE;
|
|
}
|
|
else {
|
|
usage();
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
x_dpy = XOpenDisplay(dpyName);
|
|
if (!x_dpy) {
|
|
printf("Error: couldn't open display %s\n",
|
|
dpyName ? dpyName : getenv("DISPLAY"));
|
|
return -1;
|
|
}
|
|
|
|
egl_dpy = eglGetDisplay(x_dpy);
|
|
if (!egl_dpy) {
|
|
printf("Error: eglGetDisplay() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
|
|
printf("Error: eglInitialize() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
s = eglQueryString(egl_dpy, EGL_VERSION);
|
|
printf("EGL_VERSION = %s\n", s);
|
|
|
|
make_x_window(x_dpy, egl_dpy,
|
|
"xegl_tri", 0, 0, winWidth, winHeight,
|
|
&win, &egl_ctx, &egl_surf);
|
|
|
|
XMapWindow(x_dpy, win);
|
|
if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
|
|
printf("Error: eglMakeCurrent() failed\n");
|
|
return -1;
|
|
}
|
|
|
|
if (printInfo) {
|
|
printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
|
|
printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
|
|
printf("GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
|
|
}
|
|
|
|
init();
|
|
|
|
/* Set initial projection/viewing transformation.
|
|
* We can't be sure we'll get a ConfigureNotify event when the window
|
|
* first appears.
|
|
*/
|
|
reshape(winWidth, winHeight);
|
|
|
|
event_loop(x_dpy, win, egl_dpy, egl_surf);
|
|
|
|
eglDestroyContext(egl_dpy, egl_ctx);
|
|
eglDestroySurface(egl_dpy, egl_surf);
|
|
eglTerminate(egl_dpy);
|
|
|
|
|
|
XDestroyWindow(x_dpy, win);
|
|
XCloseDisplay(x_dpy);
|
|
|
|
return 0;
|
|
}
|