| /* |
| * 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 and OpenGL ES 1.x |
| * Brian Paul |
| * 5 June 2008 |
| */ |
| |
| #define USE_FULL_GL 0 |
| |
| #define USE_FIXED_POINT 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> |
| |
| |
| #define FLOAT_TO_FIXED(X) ((X) * 65535.0) |
| |
| |
| |
| static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0; |
| |
| |
| static void |
| draw(void) |
| { |
| #if USE_FIXED_POINT |
| static const GLfixed verts[3][2] = { |
| { -65536, -65536 }, |
| { 65536, -65536 }, |
| { 0, 65536 } |
| }; |
| static const GLfixed colors[3][4] = { |
| { 65536, 0, 0, 65536 }, |
| { 0, 65536, 0 , 65536}, |
| { 0, 0, 65536 , 65536} |
| }; |
| #else |
| static const GLfloat verts[3][2] = { |
| { -1, -1 }, |
| { 1, -1 }, |
| { 0, 1 } |
| }; |
| static const GLfloat colors[3][4] = { |
| { 1, 0, 0, 1 }, |
| { 0, 1, 0, 1 }, |
| { 0, 0, 1, 1 } |
| }; |
| #endif |
| |
| 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); |
| |
| { |
| #if USE_FIXED_POINT |
| glVertexPointer(2, GL_FIXED, 0, verts); |
| glColorPointer(4, GL_FIXED, 0, colors); |
| #else |
| glVertexPointer(2, GL_FLOAT, 0, verts); |
| glColorPointer(4, GL_FLOAT, 0, colors); |
| #endif |
| glEnableClientState(GL_VERTEX_ARRAY); |
| glEnableClientState(GL_COLOR_ARRAY); |
| |
| /* draw triangle */ |
| glDrawArrays(GL_TRIANGLES, 0, 3); |
| |
| /* draw some points */ |
| glPointSizex(FLOAT_TO_FIXED(15.5)); |
| glDrawArrays(GL_POINTS, 0, 3); |
| |
| glDisableClientState(GL_VERTEX_ARRAY); |
| glDisableClientState(GL_COLOR_ARRAY); |
| } |
| |
| if (0) { |
| /* test code */ |
| GLfixed size; |
| glGetFixedv(GL_POINT_SIZE, &size); |
| printf("GL_POINT_SIZE = 0x%x %f\n", size, size / 65536.0); |
| } |
| |
| 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(); |
| #ifdef GL_VERSION_ES_CM_1_0 |
| glFrustumf(-ar, ar, -1, 1, 5.0, 60.0); |
| #else |
| glFrustum(-ar, ar, -1, 1, 5.0, 60.0); |
| #endif |
| |
| glMatrixMode(GL_MODELVIEW); |
| glLoadIdentity(); |
| glTranslatef(0.0, 0.0, -10.0); |
| } |
| |
| |
| static void |
| test_query_matrix(void) |
| { |
| PFNGLQUERYMATRIXXOESPROC procQueryMatrixx; |
| typedef void (*voidproc)(); |
| GLfixed mantissa[16]; |
| GLint exponent[16]; |
| GLbitfield rv; |
| int i; |
| |
| procQueryMatrixx = (PFNGLQUERYMATRIXXOESPROC) eglGetProcAddress("glQueryMatrixxOES"); |
| assert(procQueryMatrixx); |
| /* Actually try out this one */ |
| rv = (*procQueryMatrixx)(mantissa, exponent); |
| for (i = 0; i < 16; i++) { |
| if (rv & (1<<i)) { |
| printf("matrix[%d] invalid\n", i); |
| } |
| else { |
| printf("matrix[%d] = %f * 2^(%d)\n", i, mantissa[i]/65536.0, exponent[i]); |
| } |
| } |
| assert(!eglGetProcAddress("glFoo")); |
| } |
| |
| |
| static void |
| init(void) |
| { |
| glClearColor(0.4, 0.4, 0.4, 0.0); |
| |
| if (0) |
| test_query_matrix(); |
| } |
| |
| |
| /* |
| * 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_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); |
| } |
| |
| 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); |
| } |
| |
| #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] == 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; |
| |
| 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, |
| "OpenGL ES 1.x 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) { |
| 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; |
| } |