ref: 0ee609991acfa6dad6136b728e3c3878c406c662
dir: /SDL_Examples/helloworld.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 "../include/GL/gl.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//#include <GL/glu.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;
int do2 = 0;
#ifndef M_PI
#define M_PI 3.14159265
#endif
GLuint tex = 0;
double time_passed = 0.0;
int winSizeX = 640;
int winSizeY = 480;
void draw() {
// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// glEnable(GL_TEXTURE_2D);
// glBindTexture(GL_TEXTURE_2D,tex);
// time_passed += 0.0166666;
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glPushMatrix();
glRotatef(time_passed, 0, 0, 1);
glBegin(GL_TRIANGLES);
glColor3f(0.2, 0.2, 1.0); // BLUE!
// glColor3f(1.0, 0.2, 0.2); //RED!
glVertex3f(-0.8, -0.8, 0.2);
glColor3f(0.2, 1.0, 0.2); // GREEN!
// glColor3f(1.0, 0.2, 0.2); //RED!
glVertex3f(0.8, -0.8, 0.2);
glColor3f(1.0, 0.2, 0.2); // RED!
glVertex3f(0, 1.2, 0.2);
glEnd();
glPopMatrix();
}
void draw2() {
// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
int x = 0;
// Select and setup the projection matrix
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
mat4 m = perspective(65.0f, (GLfloat)winSizeX / (GLfloat)winSizeY, 1.0f, 100.0f);
glLoadMatrixf(m.d);
// GLfloat h = (GLfloat) winSizeY / (GLfloat) winSizeX;
// glFrustum( -1.0, 1.0, -h, h, 5.0, 60.0 );
// Select and setup the modelview matrix
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glRotatef(-90, 1, 0, 0);
glTranslatef(0, 0, -1.0f);
// Draw a rotating colorful triangle
glTranslatef(0.0f, 14.0f, 0.0f);
glRotatef(0.3f * (GLfloat)x + (GLfloat)time_passed * 100.0f, 0.0f, 0.0f, 1.0f);
glBegin(GL_TRIANGLES);
glColor4f(1.0f, 0.01f, 0.01f, 0.0f);
glVertex3f(-5.0f, 0.0f, -4.0f);
glColor4f(0.01f, 1.0f, 0.01f, 0.0f);
glVertex3f(5.0f, 0.0f, -4.0f);
glColor4f(0.01f, 0.01f, 1.0f, 0.0f);
glVertex3f(0.0f, 0.0f, 6.0f);
glEnd();
}
void initScene() {
// glLightfv( GL_LIGHT0, GL_AMBIENT, white);
// glLightfv( GL_LIGHT0, GL_SPECULAR, white);
// glEnable( GL_CULL_FACE );
glDisable(GL_CULL_FACE);
glEnable(GL_LIGHTING);
glDisable(GL_TEXTURE_2D);
glDisable(GL_LIGHTING);
// glEnable( GL_LIGHT0 );
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glTextSize(GL_TEXT_SIZE24x24);
/*
{
int sw = 0, sh = 0, sc = 0; //sc goes unused.
uchar* source_data = stbi_load("texture.png", &sw, &sh, &sc, 3);
if(source_data){
tex = loadRGBTexture(source_data, sw, sh);
free(source_data);
} else {
printf("\nCan't load texture!\n");
}
}*/
glEnable(GL_NORMALIZE);
}
int main(int argc, char** argv) {
// initialize SDL video:
unsigned int fps = 0;
char needsRGBAFix = 0;
if (argc > 1) {
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);
if (!strcmp(argv[i], "-nosdl"))
noSDL = 1;
if (!strcmp(argv[i], "-2"))
do2 = 1;
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:
// fprintf(stderr,"\nUnsupported by maintainer!!!");
mode = ZB_MODE_5R6G5B;
// return 1;
break;
case 24:
fprintf(stderr, "\nUnsupported by maintainer!!!");
mode = ZB_MODE_RGB24;
return 1;
break;
case 32:
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);
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:
unsigned int frames = 0;
unsigned int tNow = SDL_GetTicks();
unsigned int tLastFps = tNow;
// main loop:
int isRunning = 1;
while (isRunning) {
++frames;
tNow = SDL_GetTicks();
time_passed += 0.01666666;
// do event handling:
SDL_Event evt;
while (SDL_PollEvent(&evt))
switch (evt.type) {
case SDL_KEYDOWN:
switch (evt.key.keysym.sym) {
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);
if (do2)
draw2();
else
draw();
glDrawText((unsigned char*)"Hello World!\nFrom TinyGL", 0, 0, 0x00FFFFFF);
// 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;
}
/*
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);
*/
// 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
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:
{
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:
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;
}