--- /dev/null
+/*
+ * Simple demo for eglBindTexImage. Based on xegl_tri.c by
+ *
+ * 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.
+ */
+
+/*
+ * The spec says that eglBindTexImage supports only OpenGL ES context, but this
+ * demo uses OpenGL context. Keep in mind that this is non-standard.
+ */
+
+#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>
+#include <EGL/egl.h>
+
+static EGLDisplay dpy;
+static EGLContext ctx_win, ctx_pbuf;
+static EGLSurface surf_win, surf_pbuf;
+static GLuint tex_pbuf;
+
+static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0;
+static GLboolean blend = GL_TRUE;
+static GLuint color_flow;
+
+static void
+make_pbuffer(int width, int height)
+{
+ static const EGLint config_attribs[] = {
+ EGL_RED_SIZE, 8,
+ EGL_GREEN_SIZE, 8,
+ EGL_BLUE_SIZE, 8,
+ EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE,
+ EGL_NONE
+ };
+ EGLint pbuf_attribs[] = {
+ EGL_WIDTH, width,
+ EGL_HEIGHT, height,
+ EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGB,
+ EGL_TEXTURE_TARGET, EGL_TEXTURE_2D,
+ EGL_NONE
+ };
+ EGLConfig config;
+ EGLint num_configs;
+
+ if (!eglChooseConfig(dpy, config_attribs, &config, 1, &num_configs)) {
+ printf("Error: couldn't get an EGL visual config for pbuffer\n");
+ exit(1);
+ }
+
+ eglBindAPI(EGL_OPENGL_API);
+ ctx_pbuf = eglCreateContext(dpy, config, EGL_NO_CONTEXT, NULL );
+ surf_pbuf = eglCreatePbufferSurface(dpy, config, pbuf_attribs);
+ if (surf_pbuf == EGL_NO_SURFACE) {
+ printf("failed to allocate pbuffer\n");
+ exit(1);
+ }
+
+ glGenTextures(1, &tex_pbuf);
+}
+
+static void
+use_pbuffer(void)
+{
+ static int initialized;
+
+ eglMakeCurrent(dpy, surf_pbuf, surf_pbuf, ctx_pbuf);
+ if (!initialized) {
+ EGLint width, height;
+ GLfloat ar;
+
+ initialized = 1;
+
+ eglQuerySurface(dpy, surf_pbuf, EGL_WIDTH, &width);
+ eglQuerySurface(dpy, surf_pbuf, EGL_WIDTH, &height);
+ ar = (GLfloat) width / (GLfloat) height;
+
+ glViewport(0, 0, (GLint) width, (GLint) height);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glFrustum(-ar, ar, -1, 1, 1.0, 10.0);
+
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+
+ /* y-inverted */
+ glScalef(1.0, -1.0, 1.0);
+
+ glTranslatef(0.0, 0.0, -5.0);
+
+ glClearColor(0.2, 0.2, 0.2, 0.0);
+ }
+}
+
+static void
+make_window(Display *x_dpy, const char *name,
+ int x, int y, int width, int height,
+ Window *winRet)
+{
+ static const EGLint attribs[] = {
+ EGL_RED_SIZE, 8,
+ EGL_GREEN_SIZE, 8,
+ EGL_BLUE_SIZE, 8,
+ EGL_ALPHA_SIZE, 8,
+ EGL_DEPTH_SIZE, 8,
+ EGL_NONE
+ };
+
+ int scrnum;
+ XSetWindowAttributes attr;
+ unsigned long mask;
+ Window root;
+ Window win;
+ XVisualInfo *visInfo, visTemplate;
+ int num_visuals;
+ EGLConfig config;
+ EGLint num_configs, vid;
+
+ scrnum = DefaultScreen( x_dpy );
+ root = RootWindow( x_dpy, scrnum );
+
+ if (!eglChooseConfig(dpy, attribs, &config, 1, &num_configs)) {
+ printf("Error: couldn't get an EGL visual config\n");
+ exit(1);
+ }
+
+ if (!eglGetConfigAttrib(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;
+ attr.override_redirect = 0;
+ mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask | CWOverrideRedirect;
+
+ 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_win = eglCreateContext(dpy, config, EGL_NO_CONTEXT, NULL );
+ if (!ctx_win) {
+ printf("Error: glXCreateContext failed\n");
+ exit(1);
+ }
+
+ surf_win = eglCreateWindowSurface(dpy, config, win, NULL);
+
+ XFree(visInfo);
+
+ *winRet = win;
+}
+
+static void
+use_window(void)
+{
+ static int initialized;
+
+ eglMakeCurrent(dpy, surf_win, surf_win, ctx_win);
+ if (!initialized) {
+ initialized = 1;
+ glEnable(GL_TEXTURE_2D);
+ glBindTexture(GL_TEXTURE_2D, tex_pbuf);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ }
+}
+
+static void
+draw_triangle(void)
+{
+ static const GLfloat verts[3][2] = {
+ { -3, -3 },
+ { 3, -3 },
+ { 0, 3 }
+ };
+ GLfloat colors[3][3] = {
+ { 1, 0, 0 },
+ { 0, 1, 0 },
+ { 0, 0, 1 }
+ };
+ GLint i;
+
+ /* flow the color */
+ for (i = 0; i < 3; i++) {
+ GLint first = (i + color_flow / 256) % 3;
+ GLint second = (first + 1) % 3;
+ GLint third = (second + 1) % 3;
+ GLfloat c = (color_flow % 256) / 256.0f;
+
+ c = c * c * c;
+ colors[i][first] = 1.0f - c;
+ colors[i][second] = c;
+ colors[i][third] = 0.0f;
+ }
+
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ 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);
+}
+
+static void
+draw_textured_cube(void)
+{
+ static const GLfloat verts[][2] = {
+ { -4, -4 },
+ { 4, -4 },
+ { 4, 4 },
+ { -4, 4 }
+ };
+ static const GLfloat colors[][4] = {
+ { 1, 1, 1, 0.5 },
+ { 1, 1, 1, 0.5 },
+ { 1, 1, 1, 0.5 },
+ { 1, 1, 1, 0.5 }
+ };
+ static const GLfloat texs[][2] = {
+ { 0, 0 },
+ { 1, 0 },
+ { 1, 1 },
+ { 0, 1 }
+ };
+ static const GLfloat xforms[6][4] = {
+ { 0, 0, 1, 0 },
+ { 90, 0, 1, 0 },
+ { 180, 0, 1, 0 },
+ { 270, 0, 1, 0 },
+ { 90, 1, 0, 0 },
+ { -90, 1, 0, 0 }
+ };
+ GLint i;
+
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ if (blend) {
+ glDisable(GL_DEPTH_TEST);
+ glEnable(GL_BLEND);
+ } else {
+ glEnable(GL_DEPTH_TEST);
+ glDisable(GL_BLEND);
+ }
+
+ glVertexPointer(2, GL_FLOAT, 0, verts);
+ glColorPointer(4, GL_FLOAT, 0, colors);
+ glTexCoordPointer(2, GL_FLOAT, 0, texs);
+
+ glEnableClientState(GL_VERTEX_ARRAY);
+ glEnableClientState(GL_COLOR_ARRAY);
+ glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+
+ for (i = 0; i < 6; i++) {
+ glPushMatrix();
+ glRotatef(xforms[i][0], xforms[i][1], xforms[i][2], xforms[i][3]);
+ glTranslatef(0, 0, 4.1);
+ glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
+ glPopMatrix();
+ }
+
+ glDisableClientState(GL_VERTEX_ARRAY);
+ glDisableClientState(GL_COLOR_ARRAY);
+ glDisableClientState(GL_TEXTURE_COORD_ARRAY);
+}
+
+static void
+draw(void)
+{
+ use_pbuffer();
+ draw_triangle();
+
+ use_window();
+
+ eglBindTexImage(dpy, surf_pbuf, EGL_BACK_BUFFER);
+
+ glPushMatrix();
+ glRotatef(view_rotx, 1, 0, 0);
+ glRotatef(view_roty, 0, 1, 0);
+ glRotatef(view_rotz, 0, 0, 1);
+
+ draw_textured_cube();
+
+ glPopMatrix();
+
+ eglReleaseTexImage(dpy, surf_pbuf, EGL_BACK_BUFFER);
+}
+
+/* new window size or exposure */
+static void
+reshape(int width, int height)
+{
+ GLfloat ar = (GLfloat) width / (GLfloat) height;
+
+ use_window();
+
+ 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, -40.0);
+}
+
+static void
+event_loop(Display *x_dpy, Window win)
+{
+ while (1) {
+ int redraw = 1;
+
+ if (XPending(x_dpy) > 0) {
+ XEvent event;
+ XNextEvent(x_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 if (code == XK_b) {
+ blend = !blend;
+ }
+ else {
+ r = XLookupString(&event.xkey, buffer, sizeof(buffer),
+ NULL, NULL);
+ if (buffer[0] == 27) {
+ /* escape */
+ return;
+ }
+ }
+ }
+ redraw = 1;
+ break;
+ default:
+ ; /*no-op*/
+ }
+ }
+
+ if (redraw) {
+ view_rotx += 1.0;
+ view_roty += 2.0;
+ view_rotz += 1.5;
+ color_flow += 20;
+ draw();
+ eglSwapBuffers(dpy, surf_win);
+ }
+ }
+}
+
+int
+main(int argc, char *argv[])
+{
+ const int winWidth = 300, winHeight = 300;
+ Display *x_dpy;
+ Window win;
+ char *dpyName = NULL;
+ EGLint egl_major, egl_minor;
+ const char *s;
+
+ x_dpy = XOpenDisplay(dpyName);
+ if (!x_dpy) {
+ printf("Error: couldn't open display %s\n",
+ dpyName ? dpyName : getenv("DISPLAY"));
+ return -1;
+ }
+
+ dpy = eglGetDisplay(x_dpy);
+ if (!dpy) {
+ printf("Error: eglGetDisplay() failed\n");
+ return -1;
+ }
+
+ if (!eglInitialize(dpy, &egl_major, &egl_minor)) {
+ printf("Error: eglInitialize() failed\n");
+ return -1;
+ }
+
+ s = eglQueryString(dpy, EGL_VERSION);
+ printf("EGL_VERSION = %s\n", s);
+
+ make_window(x_dpy, "color flow", 0, 0, winWidth, winHeight, &win);
+ make_pbuffer(winWidth, winHeight);
+
+ XMapWindow(x_dpy, win);
+
+ reshape(winWidth, winHeight);
+ event_loop(x_dpy, win);
+
+ glDeleteTextures(1, &tex_pbuf);
+
+ eglMakeCurrent(dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+ eglTerminate(dpy);
+
+ XDestroyWindow(x_dpy, win);
+ XCloseDisplay(x_dpy);
+
+ return 0;
+}
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