ref: 8ec1b78de635df7ceda13ff300aedc5b97408517
dir: /SDL_Examples/menu.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/3dMath.h"
#ifdef PLAY_MUSIC
#include "include/api_audio.h"
#else
typedef unsigned char uchar;
#endif
#include <SDL/SDL.h>
#ifndef M_PI
#define M_PI 3.14159265
#endif
int winSizeX = 640;
int winSizeY = 480;
int mousepos[2];
int mb = 0;
double tpassed = 0;
int isRunning = 1;
#define BEGIN_EVENT_HANDLER void events(SDL_Event* e){switch(e->type){
#define E_KEYSYM e->key.keysym.sym
#define END_EVENT_HANDLER }}
#define EVENT_HANDLER events
#define E_MOTION e->motion
#define E_BUTTON e->button.button
#define E_WINEVENT e->window.event
#define E_WINW e->window.data1
#define E_WINH e->window.data2
vec3 mouse_to_normal(){
vec3 r;
r.d[0] = mousepos[0] / (float) winSizeX;
r.d[1] = mousepos[1] / (float) winSizeY;
return r;
}
int drawBox(GLfloat x, GLfloat y, GLfloat xdim, GLfloat ydim){ //0,0 is top left, 1,1 is bottom right
vec3 r = mouse_to_normal();
int retval = 0;
if(
(x <= r.d[0]) &&
(x+xdim >= r.d[0]) &&
(y <= r.d[1]) &&
(y+ydim >= r.d[1])
) retval = 1;
x*=2;xdim*=2;
y*=2;ydim*=2;
glBegin(GL_TRIANGLES);
// TRIANGLE 1,
glTexCoord2f(0, 0);
glVertex3f(-1+x, 1-y-ydim, 0.5); //Bottom Left Corner
glTexCoord2f(1, -1);
glVertex3f(-1+x+xdim, 1-y , 0.5); //Top Right Corner
glTexCoord2f(0, -1);
glVertex3f(-1+x, 1-y, 0.5); //Top Left
// TRIANGLE 2
glTexCoord2f(0, 0);
glVertex3f(-1+x, 1-y-ydim, 0.5); //Bottom Left Corner
glTexCoord2f(1, 0);
glVertex3f(-1+x+xdim, 1-y-ydim, 0.5);
glTexCoord2f(1, -1);
glVertex3f(-1+x+xdim, 1-y , 0.5); //Top Right Corner
glEnd();
return retval;
}
void drawMouse(){
vec3 r;
r.d[0] = mousepos[0] / (float) winSizeX;
r.d[1] = mousepos[1] / (float) winSizeY;
if(!mb)
glColor3f(0.7,0.7,0.7);
else
glColor3f(1.0,0.1,0.1);
drawBox(r.d[0], r.d[1], 0.03, 0.03);
}
int drawTB(const char* text, GLuint textcolor, GLfloat x, GLfloat y, GLint size){
size = (size>64)?64:((size<8)?8:size);
size >>= 3; //divide by 8 to get the GLTEXTSIZE
if(!size || !text) return 0;
int mw = 0, h = 1, cw = 0; //max width, height, current width
for(int i = 0; text[i] != '\0' && (text[i] & 127);i++){
if(text[i] != '\n')
cw++;
else
{cw = 0; h++;}
if(mw<cw)mw=cw;
}
float w = (size)*8*(mw) / (float)winSizeX;
float bw = 3*size/(float)winSizeX;
float h_ = (size)*8*(h)/(float)winSizeY;
float bh = 3*size/(float)winSizeY;
int retval = drawBox(x-bw/2,y-bh/2, w+bw, h_+bh);
glTextSize(size);
glDrawText((unsigned char*)text, x*winSizeX, y*winSizeY, textcolor);
return retval;
}
int haveclicked = 0;
vec3 tbcoords = (vec3){{0.4,0.4,0}};
void draw() {
glColor3f(1,1,1);
if(drawTB("Click me and I toggle color!", haveclicked?0xFF0000:0x00, tbcoords.d[0], tbcoords.d[1],16) && mb == 1)
{puts("Detected click! EVENT FIRED!\n");haveclicked = !haveclicked; }
drawMouse();
}
void initScene() {
static GLfloat pos[4] = {5.0, 5.0, 10.0, 0.0};
static GLfloat white[4] = {1.0, 1.0, 1.0, 0.0};
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);
glDisable( GL_CULL_FACE );
glDisable(GL_BLEND);
//glEnable(GL_LIGHTING);
//glEnable(GL_TEXTURE_2D);
glDisable(GL_TEXTURE_2D);
glDisable(GL_LIGHTING);
// glEnable( GL_LIGHT0 );
glDisable(GL_DEPTH_TEST);
glDepthMask(GL_FALSE);
glShadeModel(GL_SMOOTH);
glTextSize(GL_TEXT_SIZE24x24);
glEnable(GL_NORMALIZE);
}
BEGIN_EVENT_HANDLER
case SDL_KEYDOWN:
switch(E_KEYSYM){
case SDLK_ESCAPE:
case SDLK_q:
isRunning = 0;
break;
case SDLK_UP: mousepos[1] -= 4; mousepos[1]%= winSizeY; break;
case SDLK_DOWN: mousepos[1] += 4;mousepos[1]%= winSizeY; break;
case SDLK_LEFT: mousepos[0] -= 4;mousepos[0]%= winSizeX; break;
case SDLK_RIGHT: mousepos[0] += 4;mousepos[0]%= winSizeX; break;
case SDLK_SPACE: case SDLK_RETURN:
mb = 1;
break;
default: break;
}
break;
case SDL_KEYUP:
switch(E_KEYSYM){
case SDLK_SPACE: case SDLK_RETURN:
mb = 0;
break;
default: break;
}
break;
case SDL_QUIT:isRunning = 0;break;
case SDL_MOUSEBUTTONDOWN:
if(E_BUTTON==SDL_BUTTON_LEFT) mb = 1;
if(E_BUTTON==SDL_BUTTON_RIGHT) {
tbcoords = mouse_to_normal();
haveclicked = 0;
}
break;
case SDL_MOUSEBUTTONUP:
if(E_BUTTON==SDL_BUTTON_LEFT) mb = 2;
break;
case SDL_MOUSEMOTION:
mousepos[0] = E_MOTION.x;
mousepos[1] = E_MOTION.y;
break;
END_EVENT_HANDLER
int main(int argc, char** argv) {
// initialize SDL video:
unsigned int fps = 0;
char needsRGBAFix = 0;
if (argc > 2) {
char* larg = argv[1];
for (int i = 0; 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);
larg = argv[i];
}
}
#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;
}
#ifdef PLAY_MUSIC
ainit(0);
#endif
SDL_Surface* screen = NULL;
if ((screen = SDL_SetVideoMode(winSizeX, winSizeY, TGL_FEATURE_RENDER_BITS, SDL_SWSURFACE)) == 0) {
fprintf(stderr, "ERROR: Video mode set failed.\n");
return 1;
}
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 (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
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;
myTrack = lmus("WWGW.mp3");
mplay(myTrack, -1, 1000);
#endif
SDL_ShowCursor(SDL_ENABLE);
SDL_WM_SetCaption(argv[0], 0);
// initialize TinyGL:
int mode;
switch (screen->format->BitsPerPixel) {
case 16:
// fprintf(stderr,"\nUnsupported by maintainer!!!");
mode = ZB_MODE_5R6G5B;
// return 1;
break;
case 32:
mode = ZB_MODE_RGBA;
break;
default:
return 1;
break;
}
ZBuffer* frameBuffer = ZB_open(winSizeX, winSizeY, mode, 0);
glInit(frameBuffer);
// initialize GL:
glClearColor(0.0, 0.0, 0.0, 0.0);
glViewport(0, 0, winSizeX, winSizeY);
glEnable(GL_DEPTH_TEST);
// 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();
// variables for timing:
long long unsigned int frames = 0;
unsigned int tNow = SDL_GetTicks();
unsigned int tLastFps = tNow;
// main loop:
while (isRunning) {
++frames;
tpassed += frames * 16.666666/1000.0;
tNow = SDL_GetTicks();
// do event handling:
SDL_Event ev;
mb = 0; //Very important
while (SDL_PollEvent(&ev)) events(&ev);
// draw scene:
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
//This is where we render our GUI!
draw();
//glDrawText((unsigned char*)"\nBlitting text\nto the screen!", 0, 0, 0x000000FF);
// swap buffers:
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
if (needsRGBAFix)
for (int i = 0; i < frameBuffer->xsize * frameBuffer->ysize; i++) {
#define DATONE (frameBuffer->pbuf[i])
DATONE = ((DATONE & 0x000000FF)) << screen->format->Rshift | ((DATONE & 0x0000FF00) >> 8) << screen->format->Gshift |
((DATONE & 0x00FF0000) >> 16) << screen->format->Bshift;
}
#endif
ZB_copyFrameBuffer(frameBuffer, screen->pixels, screen->pitch);
if (SDL_MUSTLOCK(screen))
SDL_UnlockSurface(screen);
SDL_Flip(screen);
if (fps > 0)
if ((1000 / fps) > (SDL_GetTicks() - tNow)) {
SDL_Delay((1000 / fps) - (SDL_GetTicks() - tNow)); // Yay stable framerate!
}
// check for error conditions:
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("%llu 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("%llu frames in %f secs, %f frames per second.\n", frames, (float)(tNow - tLastFps) * 0.001f, (float)frames * 1000.0f / (float)(tNow - tLastFps));
// cleanup:
ZB_close(frameBuffer);
glClose();
if (SDL_WasInit(SDL_INIT_VIDEO))
SDL_QuitSubSystem(SDL_INIT_VIDEO);
#ifdef PLAY_MUSIC
mhalt();
Mix_FreeMusic(myTrack);
acleanup();
#endif
SDL_Quit();
return 0;
}