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