ref: 520eb7ccc3162422ddcd5daeb27ce35e65e946d5
dir: /SDL_Examples/gears.c/
/* sdlGears.c */
/*
* 3-D gear wheels by Brian Paul. This program is in the public domain.
*
* ported to libSDL/TinyGL by Gerald Franz (gfz@o2online.de)
*/
//#define PLAY_MUSIC
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../include/GL/gl.h"
#include "../include/zbuffer.h"
#define CHAD_API_IMPL
#define CHAD_MATH_IMPL
#include "../include-demo/3dMath.h"
#ifdef PLAY_MUSIC
#include "../include-demo/api_audio.h"
#else
typedef unsigned char uchar;
#endif
#include <SDL/SDL.h>
int noSDL = 0;
#ifndef M_PI
#define M_PI 3.14159265
#endif
int override_drawmodes = 0;
GLubyte stipplepattern[128] = {0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55,
0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55, 0xAA, 0xAA, 0xAA, 0xAA, 0x55, 0x55, 0x55, 0x55};
/*
* 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;
glNormal3f(0.0, 0.0, 1.0);
/* draw front face */
if(override_drawmodes == 1)
glBegin(GL_LINES);
else if (override_drawmodes == 2)
glBegin(GL_POINTS);
else
{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);
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 */
if(override_drawmodes == 1)
glBegin(GL_LINES);
else if (override_drawmodes == 2)
glBegin(GL_POINTS);
else
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 */
if(override_drawmodes == 1)
glBegin(GL_LINES);
else if (override_drawmodes == 2)
glBegin(GL_POINTS);
else
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);
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 */
if(override_drawmodes == 1)
glBegin(GL_LINES);
else if (override_drawmodes == 2)
glBegin(GL_POINTS);
else
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 */
if(override_drawmodes == 1)
glBegin(GL_LINES);
else if (override_drawmodes == 2)
glBegin(GL_POINTS);
else
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();
/* draw inside radius cylinder */
if(override_drawmodes == 1)
glBegin(GL_LINES);
else if (override_drawmodes == 2)
glBegin(GL_POINTS);
else
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 GLfloat view_rotx = 20.0, view_roty = 30.0;
static GLint gear1, gear2, gear3;
static GLfloat angle = 0.0;
void draw() {
angle += 2.0;
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();
}
void initScene() {
// static GLfloat pos[4] = {0.408248290463863, 0.408248290463863, 0.816496580927726, 0.0 }; //Light at infinity.
static GLfloat pos[4] = {5, 5, 10, 0.0}; // Light at infinity.
//static GLfloat pos[4] = {5, 5, -10, 0.0}; // Light at infinity.
static GLfloat red[4] = {1.0, 0.0, 0.0, 0.0};
static GLfloat green[4] = {0.0, 1.0, 0.0, 0.0};
static GLfloat blue[4] = {0.0, 0.0, 1.0, 0.0};
static GLfloat white[4] = {1.0, 1.0, 1.0, 0.0};
static GLfloat shininess = 5;
glLightfv(GL_LIGHT0, GL_POSITION, pos);
glLightfv(GL_LIGHT0, GL_DIFFUSE, white);
// glLightfv( GL_LIGHT0, GL_AMBIENT, white);
glLightfv( GL_LIGHT0, GL_SPECULAR, white);
glEnable(GL_CULL_FACE);
glEnable(GL_LIGHT0);
//glEnable(GL_DEPTH_TEST);
glEnable(GL_POLYGON_STIPPLE);
// glDisable(GL_POLYGON_STIPPLE);
glPolygonStipple(stipplepattern);
glPointSize(10.0f);
glTextSize(GL_TEXT_SIZE24x24);
/* make the gears */
gear1 = glGenLists(1);
glNewList(gear1, GL_COMPILE);
glMaterialfv(GL_FRONT, GL_DIFFUSE, blue);
glMaterialfv(GL_FRONT, GL_SPECULAR, white);
glMaterialfv(GL_FRONT, GL_SHININESS, &shininess);
glColor3fv(blue);
gear(1.0, 4.0, 1.0, 20, 0.7); // The largest gear.
glEndList();
gear2 = glGenLists(1);
glNewList(gear2, GL_COMPILE);
glMaterialfv(GL_FRONT, GL_DIFFUSE, red);
glMaterialfv(GL_FRONT, GL_SPECULAR, white);
glColor3fv(red);
gear(0.5, 2.0, 2.0, 10, 0.7); // The small gear with the smaller hole, to the right.
glEndList();
gear3 = glGenLists(1);
glNewList(gear3, GL_COMPILE);
glMaterialfv(GL_FRONT, GL_DIFFUSE, green);
glMaterialfv(GL_FRONT, GL_SPECULAR, white);
glColor3fv(green);
gear(1.3, 2.0, 0.5, 10, 0.7); // The small gear above with the large hole.
glEndList();
// glEnable( GL_NORMALIZE );
}
int main(int argc, char** argv) {
// initialize SDL video:
int winSizeX = 640;
int winSizeY = 480;
unsigned int fps = 0;
unsigned int flat = 0;
unsigned int setenspec = 1;
unsigned int dotext = 1;
unsigned int blending = 0;
char needsRGBAFix = 0;
if (argc > 1) {
char* larg = "";
for (int i = 1; i < argc; i++) {
if (!strcmp(larg, "-w"))
winSizeX = atoi(argv[i]);
if (!strcmp(larg, "-h"))
winSizeY = atoi(argv[i]);
if (!strcmp(larg, "-fps"))
fps = strtoull(argv[i], 0, 10);
if (!strcmp(argv[i],"-flat"))
flat = 1;
if (!strcmp(argv[i],"-smooth"))
flat = 0;
if (!strcmp(argv[i],"-blend"))
blending = 1;
if (!strcmp(argv[i],"-nospecular"))
setenspec = 0;
if (!strcmp(argv[i],"-lines"))
override_drawmodes = 1;
if (!strcmp(argv[i],"-points"))
override_drawmodes = 2;
if (!strcmp(argv[i],"-nosdl"))
noSDL = 1;
if (!strcmp(argv[i],"-notext"))
dotext = 0;
larg = argv[i];
}
}
if(!noSDL){
#ifdef PLAY_MUSIC
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) {
#else
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
#endif
fprintf(stderr, "ERROR: cannot initialize SDL video.\n");
return 1;
}
} else if(SDL_Init(0) < 0) fprintf(stderr, "ERROR: cannot initialize SDL without video.\n");
#ifdef PLAY_MUSIC
if(!noSDL) ainit(0);
#endif
SDL_Surface* screen = NULL;
if(!noSDL)
if ((screen = SDL_SetVideoMode(winSizeX, winSizeY, TGL_FEATURE_RENDER_BITS, SDL_SWSURFACE)) == 0) {
fprintf(stderr, "ERROR: Video mode set failed.\n");
return 1;
}
if(!noSDL){
printf("\nRMASK IS %u", screen->format->Rmask);
printf("\nGMASK IS %u", screen->format->Gmask);
printf("\nBMASK IS %u", screen->format->Bmask);
printf("\nAMASK IS %u", screen->format->Amask);
}
#if TGL_FEATURE_RENDER_BITS == 32
if(!noSDL)
if (screen->format->Rmask != 0x00FF0000 || screen->format->Gmask != 0x0000FF00 || screen->format->Bmask != 0x000000FF) {
needsRGBAFix = 1;
printf("\nYour screen is using an RGBA output different than this library expects.");
printf("\nYou should consider using the 16 bit version for optimal performance");
}
#endif
if(!noSDL){
printf("\nRSHIFT IS %u", screen->format->Rshift);
printf("\nGSHIFT IS %u", screen->format->Gshift);
printf("\nBSHIFT IS %u", screen->format->Bshift);
printf("\nASHIFT IS %u\n", screen->format->Ashift);
}
fflush(stdout);
#ifdef PLAY_MUSIC
track* myTrack = NULL;
if(!noSDL) myTrack = lmus("WWGW.mp3");
if(!noSDL) mplay(myTrack, -1, 1000);
#endif
if(!noSDL) SDL_ShowCursor(SDL_DISABLE);
if(!noSDL) SDL_WM_SetCaption(argv[0], 0);
// initialize TinyGL:
// unsigned int pitch;
//int mode;
if(!noSDL)
switch (screen->format->BitsPerPixel) {
case 8:
fprintf(stderr, "ERROR: Palettes are currently not supported.\n");
fprintf(stderr, "\nUnsupported by maintainer!!!");
return 1;
case 16:
// pitch = screen->pitch;
// fprintf(stderr,"\nUnsupported by maintainer!!!");
//mode = ZB_MODE_5R6G5B;
// return 1;
break;
case 24:
// pitch = ( screen->pitch * 2 ) / 3;
fprintf(stderr, "\nUnsupported by maintainer!!!");
//mode = ZB_MODE_RGB24;
return 1;
break;
case 32:
// pitch = screen->pitch / 2;
//mode = ZB_MODE_RGBA;
break;
default:
return 1;
break;
}
ZBuffer* frameBuffer = NULL;
if(TGL_FEATURE_RENDER_BITS == 32)
frameBuffer = ZB_open(winSizeX, winSizeY, ZB_MODE_RGBA, 0);
else
frameBuffer = ZB_open(winSizeX, winSizeY, ZB_MODE_5R6G5B, 0);
if(!frameBuffer){printf("\nZB_open failed!");exit(1);}
glInit(frameBuffer);
//Print version info
printf("\nVersion string:\n%s",glGetString(GL_VERSION));
printf("\nVendor string:\n%s",glGetString(GL_VENDOR));
printf("\nRenderer string:\n%s",glGetString(GL_RENDERER));
printf("\nExtensions string:\n%s",glGetString(GL_EXTENSIONS));
printf("\nLicense string:\n%s",glGetString(GL_LICENSE));
// initialize GL:
glClearColor(0.0, 0.0, 0.0, 0.0);
glViewport(0, 0, winSizeX, winSizeY);
if(flat) glShadeModel(GL_FLAT); else glShadeModel(GL_SMOOTH);
//TESTING BLENDING...
//glDisable(GL_DEPTH_TEST);
//glDisable( GL_LIGHTING );
glEnable(GL_LIGHTING);
//glBlendFunc(GL_ONE_MINUS_SRC_COLOR, GL_ZERO);
glBlendEquation(GL_FUNC_ADD);
if(blending){
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glDepthMask(GL_FALSE);
glBlendFunc(GL_SRC_COLOR, GL_DST_COLOR);
glBlendEquation(GL_FUNC_ADD);
}else{
glEnable(GL_DEPTH_TEST);
glDisable(GL_BLEND);
glDepthMask(GL_TRUE);
}
GLfloat h = (GLfloat)winSizeY / (GLfloat)winSizeX;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -45.0);
initScene();
if(setenspec) glSetEnableSpecular(GL_TRUE); else glSetEnableSpecular(GL_FALSE);
// variables for timing:
unsigned int frames = 0;
unsigned int tNow = SDL_GetTicks();
unsigned int tLastFps = tNow;
// main loop:
int isRunning = 1;
//float test = 0;
while (isRunning) {
++frames;
//Depending on SDL to give us ticks even without a window open...
tNow = SDL_GetTicks();
// test = TEST_fastInvSqrt(tNow);
// printf("\n%f",test);
// do event handling:
if(!noSDL){
SDL_Event evt;
while (SDL_PollEvent(&evt))
switch (evt.type) {
case SDL_KEYDOWN:
switch (evt.key.keysym.sym) {
case SDLK_UP:
view_rotx += 5.0;
break;
case SDLK_DOWN:
view_rotx -= 5.0;
break;
case SDLK_LEFT:
view_roty += 5.0;
break;
case SDLK_RIGHT:
view_roty -= 5.0;
break;
case SDLK_ESCAPE:
case SDLK_q:
isRunning = 0;
default:
break;
}
break;
case SDL_QUIT:
isRunning = 0;
break;
}
}
// draw scene:
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
draw();
if(dotext){
glDrawText((unsigned char*)"RED text", 0, 0, 0xFF0000);
glDrawText((unsigned char*)"GREEN text", 0, 24, 0x00FF00);
glDrawText((unsigned char*)"BLUE text", 0, 48, 0xFF);
}
// swap buffers:
if(!noSDL)
if (SDL_MUSTLOCK(screen) && (SDL_LockSurface(screen) < 0)) {
fprintf(stderr, "SDL ERROR: Can't lock screen: %s\n", SDL_GetError());
return 1;
}
// Quickly convert all pixels to the correct format
#if TGL_FEATURE_RENDER_BITS == 32
// for testing!
if (needsRGBAFix)
for (int i = 0; i < frameBuffer->xsize * frameBuffer->ysize; i++) {
#define DATONE (frameBuffer->pbuf[i])
DATONE = ((DATONE & 0x00FF0000)) << screen->format->Rshift | ((DATONE & 0x0000FF00) >> 8) << screen->format->Gshift |
((DATONE & 0x000000FF) >> 16) << screen->format->Bshift;
}
#endif
if(!noSDL) ZB_copyFrameBuffer(frameBuffer, screen->pixels, screen->pitch);
if(!noSDL)
if (SDL_MUSTLOCK(screen))
SDL_UnlockSurface(screen);
if(!noSDL)SDL_Flip(screen);
if(!noSDL)
if (fps > 0)
if ((1000 / fps) > (SDL_GetTicks() - tNow)) {
SDL_Delay((1000 / fps) - (SDL_GetTicks() - tNow)); // Yay stable framerate!
}
// check for error conditions:
if(!noSDL){
char* sdl_error = SDL_GetError();
if (sdl_error[0] != '\0') {
fprintf(stderr, "SDL ERROR: \"%s\"\n", sdl_error);
SDL_ClearError();
}
}
// update fps:
if (tNow >= tLastFps + 5000) {
printf("%i frames in %f secs, %f frames per second.\n", frames, (float)(tNow - tLastFps) * 0.001f,
(float)frames * 1000.0f / (float)(tNow - tLastFps));
tLastFps = tNow;
frames = 0;
}
}
printf("%i frames in %f secs, %f frames per second.\n", frames, (float)(tNow - tLastFps) * 0.001f, (float)frames * 1000.0f / (float)(tNow - tLastFps));
// cleanup:
//glDeleteList(gear1);
//glDeleteList(gear2);
//glDeleteList(gear3);
ZB_close(frameBuffer);
glClose();
if(!noSDL)
if (SDL_WasInit(SDL_INIT_VIDEO))
SDL_QuitSubSystem(SDL_INIT_VIDEO);
#ifdef PLAY_MUSIC
if(!noSDL)mhalt();
if(!noSDL)Mix_FreeMusic(myTrack);
if(!noSDL)acleanup();
#endif
SDL_Quit();
return 0;
}