/*
* 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.
*/
/*
* Test MSAA with X/EGL and OpenGL ES 1.x
* Brian Paul
* 15 September 2008
*/
#define USE_FULL_GL 0
#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>
#if USE_FULL_GL
#include <GL/gl.h> /* use full OpenGL */
#else
#include <GLES/gl.h> /* use OpenGL ES 1.x */
#include <GLES/glext.h>
#endif
#include <EGL/egl.h>
static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0;
static GLboolean AA = 0*GL_TRUE;
static void
draw(void)
{
float a;
static const GLfloat verts[4][2] = {
{ -1, -.1 },
{ 1, -.1 },
{ -1, .1 },
{ 1, .1 }
};
static const GLfloat colors[4][4] = {
{ 1, 0, 0, 1 },
{ 0, 1, 0, 1 },
{ 0, 0, 1, 1 },
{ 1, 0, 1, 1 }
};
if (AA) {
printf("MSAA enabled\n");
glEnable(GL_MULTISAMPLE);
}
else {
printf("MSAA disabled\n");
glDisable(GL_MULTISAMPLE);
}
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(4, GL_FLOAT, 0, colors);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
for (a = 0; a < 360; a += 20.0) {
glPushMatrix();
glRotatef(a, 0, 0, 1);
glTranslatef(1.5, 0, 0);
/* draw triangle */
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glPopMatrix();
}
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
}
glPopMatrix();
}
/* new window size or exposure */
static void
reshape(int width, int height)
{
GLfloat ary = 3.0;
GLfloat arx = ary * (GLfloat) width / (GLfloat) height;
glViewport(0, 0, (GLint) width, (GLint) height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
#ifdef GL_VERSION_ES_CM_1_0
glOrthof(-arx, arx, -ary, ary, -1.0, 1.0);
#else
glOrtho(-arx, arx, -ary, ary, -1.0, 1.0);
#endif
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
static void
init(void)
{
printf("Press 'a' to toggle multisample antialiasing\n");
printf("Press 'Esc' to exit\n");
}
/*
* 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_SAMPLES, 1,
EGL_SAMPLE_BUFFERS, 1,
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)) {
printf("Error: couldn't get an EGL visual config\n");
exit(1);
}
if (num_configs < 1) {
printf("Error: Unable to find multisample pixel format.\n");
printf("Try running glxinfo to see if your server supports MSAA.\n");
exit(1);
}
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);
}
#if USE_FULL_GL
eglBindAPI(EGL_OPENGL_API);
#else
eglBindAPI(EGL_OPENGL_ES_API);
#endif
ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, NULL );
if (!ctx) {
printf("Error: eglCreateContext 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] == 'a') {
AA = !AA;
redraw = 1;
}
else 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 = 600, winHeight = 600;
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;
static struct {
char *name;
GLenum value;
enum {GetString, GetInteger} type;
} info_items[] = {
{"GL_RENDERER", GL_RENDERER, GetString},
{"GL_VERSION", GL_VERSION, GetString},
{"GL_VENDOR", GL_VENDOR, GetString},
{"GL_EXTENSIONS", GL_EXTENSIONS, GetString},
{"GL_MAX_PALETTE_MATRICES_OES", GL_MAX_PALETTE_MATRICES_OES, GetInteger},
{"GL_MAX_VERTEX_UNITS_OES", GL_MAX_VERTEX_UNITS_OES, GetInteger},
};
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);
s = eglQueryString(egl_dpy, EGL_VENDOR);
printf("EGL_VENDOR = %s\n", s);
s = eglQueryString(egl_dpy, EGL_EXTENSIONS);
printf("EGL_EXTENSIONS = %s\n", s);
s = eglQueryString(egl_dpy, EGL_CLIENT_APIS);
printf("EGL_CLIENT_APIS = %s\n", s);
make_x_window(x_dpy, egl_dpy,
"msaa", 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) {
for (i = 0; i < sizeof(info_items)/sizeof(info_items[0]); i++) {
switch (info_items[i].type) {
case GetString:
printf("%s = %s\n", info_items[i].name, (char *)glGetString(info_items[i].value));
break;
case GetInteger: {
GLint rv = -1;
glGetIntegerv(info_items[i].value, &rv);
printf("%s = %d\n", info_items[i].name, rv);
break;
}
}
}
};
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;
}