/* * Copyright (C) 1999-2001 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. */ /* * This is a port of the infamous "glxgears" demo to straight EGL * Port by Dane Rushton 10 July 2005 * * No command line options. * Program runs for 5 seconds then exits, outputing framerate to console */ #define EGL_EGLEXT_PROTOTYPES #include <assert.h> #include <math.h> #include <stdlib.h> #include <stdio.h> #include <string.h> #include <GL/gl.h> #include <EGL/egl.h> #include <EGL/eglext.h> #define MAX_CONFIGS 10 #define MAX_MODES 100 #define BENCHMARK #ifdef BENCHMARK /* XXX this probably isn't very portable */ #include <sys/time.h> #include <unistd.h> /* return current time (in seconds) */ static double current_time(void) { struct timeval tv; #ifdef __VMS (void) gettimeofday(&tv, NULL ); #else struct timezone tz; (void) gettimeofday(&tv, &tz); #endif return (double) tv.tv_sec + tv.tv_usec / 1000000.0; } #else /*BENCHMARK*/ /* dummy */ static double current_time(void) { /* update this function for other platforms! */ static double t = 0.0; static int warn = 1; if (warn) { fprintf(stderr, "Warning: current_time() not implemented!!\n"); warn = 0; } return t += 1.0; } #endif /*BENCHMARK*/ #ifndef M_PI #define M_PI 3.14159265 #endif static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0; static GLint gear1, gear2, gear3; static GLfloat angle = 0.0; #if 0 static GLfloat eyesep = 5.0; /* Eye separation. */ static GLfloat fix_point = 40.0; /* Fixation point distance. */ static GLfloat left, right, asp; /* Stereo frustum params. */ #endif /* * * Draw a gear wheel. You'll probably want to call this function when * building a display list since we do a lot of trig here. * * Input: inner_radius - radius of hole at center * outer_radius - radius at center of teeth * width - width of gear * teeth - number of teeth * tooth_depth - depth of tooth */ static void gear(GLfloat inner_radius, GLfloat outer_radius, GLfloat width, GLint teeth, GLfloat tooth_depth) { GLint i; GLfloat r0, r1, r2; GLfloat angle, da; GLfloat u, v, len; r0 = inner_radius; r1 = outer_radius - tooth_depth / 2.0; r2 = outer_radius + tooth_depth / 2.0; da = 2.0 * M_PI / teeth / 4.0; glShadeModel(GL_FLAT); glNormal3f(0.0, 0.0, 1.0); /* draw front face */ glBegin(GL_QUAD_STRIP); for (i = 0; i <= teeth; i++) { angle = i * 2.0 * M_PI / teeth; glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); if (i < teeth) { glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); } } glEnd(); /* draw front sides of teeth */ glBegin(GL_QUADS); da = 2.0 * M_PI / teeth / 4.0; for (i = 0; i < teeth; i++) { angle = i * 2.0 * M_PI / teeth; glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5); glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5); glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); } glEnd(); glNormal3f(0.0, 0.0, -1.0); /* draw back face */ glBegin(GL_QUAD_STRIP); for (i = 0; i <= teeth; i++) { angle = i * 2.0 * M_PI / teeth; glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); if (i < teeth) { glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); } } glEnd(); /* draw back sides of teeth */ glBegin(GL_QUADS); da = 2.0 * M_PI / teeth / 4.0; for (i = 0; i < teeth; i++) { angle = i * 2.0 * M_PI / teeth; glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5); glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5); glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); } glEnd(); /* draw outward faces of teeth */ glBegin(GL_QUAD_STRIP); for (i = 0; i < teeth; i++) { angle = i * 2.0 * M_PI / teeth; glVertex3f(r1 * cos(angle), r1 * sin(angle), width * 0.5); glVertex3f(r1 * cos(angle), r1 * sin(angle), -width * 0.5); u = r2 * cos(angle + da) - r1 * cos(angle); v = r2 * sin(angle + da) - r1 * sin(angle); len = sqrt(u * u + v * v); u /= len; v /= len; glNormal3f(v, -u, 0.0); glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), width * 0.5); glVertex3f(r2 * cos(angle + da), r2 * sin(angle + da), -width * 0.5); glNormal3f(cos(angle), sin(angle), 0.0); glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), width * 0.5); glVertex3f(r2 * cos(angle + 2 * da), r2 * sin(angle + 2 * da), -width * 0.5); u = r1 * cos(angle + 3 * da) - r2 * cos(angle + 2 * da); v = r1 * sin(angle + 3 * da) - r2 * sin(angle + 2 * da); glNormal3f(v, -u, 0.0); glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), width * 0.5); glVertex3f(r1 * cos(angle + 3 * da), r1 * sin(angle + 3 * da), -width * 0.5); glNormal3f(cos(angle), sin(angle), 0.0); } glVertex3f(r1 * cos(0), r1 * sin(0), width * 0.5); glVertex3f(r1 * cos(0), r1 * sin(0), -width * 0.5); glEnd(); glShadeModel(GL_SMOOTH); /* draw inside radius cylinder */ glBegin(GL_QUAD_STRIP); for (i = 0; i <= teeth; i++) { angle = i * 2.0 * M_PI / teeth; glNormal3f(-cos(angle), -sin(angle), 0.0); glVertex3f(r0 * cos(angle), r0 * sin(angle), -width * 0.5); glVertex3f(r0 * cos(angle), r0 * sin(angle), width * 0.5); } glEnd(); } static void draw(void) { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glRotatef(view_rotx, 1.0, 0.0, 0.0); glRotatef(view_roty, 0.0, 1.0, 0.0); glRotatef(view_rotz, 0.0, 0.0, 1.0); glPushMatrix(); glTranslatef(-3.0, -2.0, 0.0); glRotatef(angle, 0.0, 0.0, 1.0); glCallList(gear1); glPopMatrix(); glPushMatrix(); glTranslatef(3.1, -2.0, 0.0); glRotatef(-2.0 * angle - 9.0, 0.0, 0.0, 1.0); glCallList(gear2); glPopMatrix(); glPushMatrix(); glTranslatef(-3.1, 4.2, 0.0); glRotatef(-2.0 * angle - 25.0, 0.0, 0.0, 1.0); glCallList(gear3); glPopMatrix(); glPopMatrix(); } /* new window size or exposure */ static void reshape(int width, int height) { GLfloat h = (GLfloat) height / (GLfloat) width; glViewport(0, 0, (GLint) width, (GLint) height); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0, 0.0, -40.0); } static void init(void) { static GLfloat pos[4] = { 5.0, 5.0, 10.0, 0.0 }; static GLfloat red[4] = { 0.8, 0.1, 0.0, 1.0 }; static GLfloat green[4] = { 0.0, 0.8, 0.2, 1.0 }; static GLfloat blue[4] = { 0.2, 0.2, 1.0, 1.0 }; glLightfv(GL_LIGHT0, GL_POSITION, pos); glEnable(GL_CULL_FACE); glEnable(GL_LIGHTING); glEnable(GL_LIGHT0); glEnable(GL_DEPTH_TEST); /* make the gears */ gear1 = glGenLists(1); glNewList(gear1, GL_COMPILE); glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red); gear(1.0, 4.0, 1.0, 20, 0.7); glEndList(); gear2 = glGenLists(1); glNewList(gear2, GL_COMPILE); glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, green); gear(0.5, 2.0, 2.0, 10, 0.7); glEndList(); gear3 = glGenLists(1); glNewList(gear3, GL_COMPILE); glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, blue); gear(1.3, 2.0, 0.5, 10, 0.7); glEndList(); glEnable(GL_NORMALIZE); } static void run_gears(EGLDisplay dpy, EGLSurface surf, int ttr) { double st = current_time(); double ct = st; int frames = 0; GLfloat seconds, fps; while (ct - st < ttr) { double tt = current_time(); double dt = tt - ct; ct = tt; /* advance rotation for next frame */ angle += 70.0 * dt; /* 70 degrees per second */ if (angle > 3600.0) angle -= 3600.0; draw(); eglSwapBuffers(dpy, surf); frames++; } seconds = ct - st; fps = frames / seconds; printf("%d frames in %3.1f seconds = %6.3f FPS\n", frames, seconds, fps); } int main(int argc, char *argv[]) { int major, minor; EGLContext ctx; EGLSurface surface; EGLConfig configs[MAX_CONFIGS]; EGLint numConfigs, i; EGLBoolean b; EGLDisplay d; EGLint screenAttribs[10]; GLboolean printInfo = GL_FALSE; EGLint width = 300, height = 300; /* parse cmd line args */ for (i = 1; i < argc; i++) { if (strcmp(argv[i], "-info") == 0) { printInfo = GL_TRUE; } else printf("Warning: unknown parameter: %s\n", argv[i]); } /* DBR : Create EGL context/surface etc */ d = eglGetDisplay(EGL_DEFAULT_DISPLAY); assert(d); if (!eglInitialize(d, &major, &minor)) { printf("peglgears: eglInitialize failed\n"); return 0; } printf("peglgears: EGL version = %d.%d\n", major, minor); printf("peglgears: EGL_VENDOR = %s\n", eglQueryString(d, EGL_VENDOR)); eglGetConfigs(d, configs, MAX_CONFIGS, &numConfigs); eglBindAPI(EGL_OPENGL_API); ctx = eglCreateContext(d, configs[0], EGL_NO_CONTEXT, NULL); if (ctx == EGL_NO_CONTEXT) { printf("peglgears: failed to create context\n"); return 0; } /* build up screenAttribs array */ i = 0; screenAttribs[i++] = EGL_WIDTH; screenAttribs[i++] = width; screenAttribs[i++] = EGL_HEIGHT; screenAttribs[i++] = height; screenAttribs[i++] = EGL_NONE; surface = eglCreatePbufferSurface(d, configs[0], screenAttribs); if (surface == EGL_NO_SURFACE) { printf("peglgears: failed to create pbuffer surface\n"); return 0; } b = eglMakeCurrent(d, surface, surface, ctx); if (!b) { printf("peglgears: make current failed\n"); return 0; } 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)); printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS)); } init(); reshape(width, height); glDrawBuffer( GL_BACK ); run_gears(d, surface, 5.0); eglDestroySurface(d, surface); eglDestroyContext(d, ctx); eglTerminate(d); return 0; }