ref: c37ed9b9460b20478ec194536b82f6e754c56412
dir: /SDL_Examples/texture.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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "../include/GL/gl.h"
#define CHAD_API_IMPL
#include "include/api_audio.h"
#define STB_IMAGE_IMPLEMENTATION
#include "include/stb_image.h"
#include <SDL/SDL.h>
#include "../include/zbuffer.h"
#ifndef M_PI
# define M_PI 3.14159265
#endif
GLuint tex = 0;
GLuint loadRGBTexture(unsigned char* buf, unsigned int w, unsigned int h){
GLuint t = 0;
glGenTextures(1, &t);
// for(unsigned int i = 0; i < w * h; i++)
// {
// unsigned char t = 0;
// unsigned char* r = buf + i*3;
// // unsigned char* g = buf + i*3+1;
// unsigned char* b = buf + i*3+2;
// t = *r;
// *r = *b;
// *b = t;
// }
glBindTexture(GL_TEXTURE_2D,t);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D,0,3,w,h,0,GL_RGB,GL_UNSIGNED_BYTE,buf);
return t;
}
void draw() {
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D,tex);
glBegin( GL_TRIANGLES );
//TRIANGLE 1,
glTexCoord2f(0,0);
glVertex3f(-1,-1, 0.5);
glTexCoord2f(1,-1);
glVertex3f(1,1, 0.5);
glTexCoord2f(0,-1);
glVertex3f(-1,1 ,0.5);
//TRIANGLE 2
glTexCoord2f(0,0);
glVertex3f(-1,-1, 0.5);
glTexCoord2f(1,0);
glVertex3f(1,-1, 0.5);
glTexCoord2f(1,-1);
glVertex3f(1,1, 0.5);
glEnd();
}
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 );
glEnable( GL_LIGHTING );
glEnable( 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:
int winSizeX=640;
int winSizeY=480;
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];
}
}
if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)<0) {
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);
track* myTrack = NULL;
#ifdef PLAY_MUSIC
myTrack = lmus("WWGW.mp3");
mplay(myTrack, -1, 1000);
#endif
SDL_ShowCursor(SDL_DISABLE);
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, 0, 0, 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();
// do event handling:
SDL_Event evt;
while( SDL_PollEvent( &evt ) ) switch(evt.type) {
case SDL_KEYDOWN:
switch(evt.key.keysym.sym) {
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();
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;
}
/*
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
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("%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);
if(SDL_WasInit(SDL_INIT_VIDEO))
SDL_QuitSubSystem(SDL_INIT_VIDEO);
#ifdef PLAY_MUSIC
mhalt();
Mix_FreeMusic(myTrack);
acleanup();
#endif
SDL_Quit();
return 0;
}