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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "SDL.h"
#include "SDL_opengl.h"
#include "SDL_image.h"
#include "glpong3d.h"
int main(int argc, char * argv[]) {
if (argc) {
if (argv) {}
}
GLPong_Init();
while ( !GLPong.done ) {
GLPong_HandleEvents();
/* GLPong_Move();*/
GLPong_Draw();
SDL_Delay(10);
}
GLPong_CleanUp();
return 0;
}
void GLPong_Init() {
SDL_Surface * temp = NULL;
GLPong.done = 0;
GLPong.w = 800;
GLPong.h = 600;
GLPong.Ball.w = 1.0f;
GLPong.Ball.h = 1.0f;
GLPong.Ball.x = -0.5f;
GLPong.Ball.y = -0.5f;
GLPong.Ball.z = -3.0f;
GLPong.Ball.xv = 0.0f;
GLPong.Ball.yv = 0.0f;
GLPong.Ball.zv = -0.05f;
SDL_Init(SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE);
atexit(SDL_Quit);
SDL_WM_SetCaption("glpong3d", "glpong3d");
temp = IMG_Load("ball.png");
SDL_WM_SetIcon(temp, NULL);
SDL_FreeSurface(temp);
SDL_ShowCursor(SDL_DISABLE);
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
GLPong.Surface = SDL_SetVideoMode(GLPong.w, GLPong.h, 32, SDL_OPENGL);
glViewport(0, 0, GLPong.w, GLPong.h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f, GLPong.w / GLPong.h, 0.1f, 50.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glShadeModel(GL_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
GLPong.Event.type = SDL_NOEVENT;
printf("OpenGL Vendor: %s\n", glGetString(GL_VENDOR));
printf("OpenGL Renderer: %s\n", glGetString(GL_RENDERER));
printf("OpenGL Version: %s\n", glGetString(GL_VERSION));
printf("OpenGL Extensions: %s\n", glGetString(GL_EXTENSIONS));
temp = IMG_Load("128x128.png");
ball_texture = SDL_GL_SurfaceToTexture(temp);
SDL_FreeSurface(temp);
}
void GLPong_HandleEvents() {
if (SDL_PollEvent(&GLPong.Event) != 0) {
if (GLPong.Event.type == SDL_QUIT) {
GLPong.done = 1;
return;
}
if (GLPong.Event.type == SDL_KEYDOWN) {
if (GLPong.Event.key.keysym.sym == SDLK_ESCAPE) {
GLPong.done = 1;
return;
} else if (GLPong.Event.key.keysym.sym == SDLK_p) {
for (;;) {
SDL_Delay(10);
if (SDL_PollEvent(&GLPong.Event) != 0) {
if (GLPong.Event.type == SDL_QUIT) {
GLPong.done = 1;
return;
} else if (GLPong.Event.type == SDL_KEYDOWN){
if (GLPong.Event.key.keysym.sym == SDLK_ESCAPE) {
GLPong.done = 1;
return;
} else if (GLPong.Event.key.keysym.sym == SDLK_p) {
break;
}
}
}
}
}
}
}
}
void GLPong_Draw() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBindTexture(GL_TEXTURE_2D, ball_texture);
glEnable(GL_TEXTURE_2D);
glLoadIdentity();
glTranslatef(GLPong.Ball.x, GLPong.Ball.y, GLPong.Ball.z);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 1.0f); glVertex2f(GLPong.Ball.w, GLPong.Ball.h); /* Lower Left */
glTexCoord2f(1.0f, 1.0f); glVertex2f(0.0f, GLPong.Ball.h); /* Lower Right */
glTexCoord2f(1.0f, 0.0f); glVertex2f(0.0f, 0.0f); /* Upper Right */
glTexCoord2f(0.0f, 0.0f); glVertex2f(GLPong.Ball.w, 0.0f); /* Upper Left */
glEnd();
glDisable(GL_TEXTURE_2D);
SDL_GL_SwapBuffers();
}
void GLPong_CleanUp() {
}
void GLPong_Move() {
GLPong.Ball.x += GLPong.Ball.xv;
GLPong.Ball.y += GLPong.Ball.yv;
GLPong.Ball.z += GLPong.Ball.zv;
if (GLPong.Ball.z < -12.0f) {
GLPong.Ball.zv = -GLPong.Ball.zv;
} else if (GLPong.Ball.z > -3.0f) {
GLPong.Ball.zv = -GLPong.Ball.zv;
}
}
__inline__ unsigned int NextPow2(unsigned int value) {
unsigned int x;
__asm("dec %1\n\t"
"movl $2,%0\n\t"
"bsr %1,%1\n\t"
"shl %b1,%0\n\t"
: "=r" (x)
: "c" (value)
);
return x;
}
GLuint SDL_GL_SurfaceToTexture(SDL_Surface * surface) {
Uint32 rmask, gmask, bmask, amask;
GLuint texture;
GLenum format = GL_RGB;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
rmask = 0xff000000;
gmask = 0x00ff0000;
bmask = 0x0000ff00;
amask = 0x000000ff;
#else
rmask = 0x000000ff;
gmask = 0x0000ff00;
bmask = 0x00ff0000;
amask = 0xff000000;
#endif
if (surface->format->Rmask & rmask) {
format = GL_RGB;
printf("GL_RGB");
if (surface->format->BitsPerPixel == 32) {
format = GL_RGBA;
printf("A");
}
} else if (surface->format->Rmask & bmask) {
format = GL_BGR;
printf("GL_BGR");
if (surface->format->BitsPerPixel == 32) {
format = GL_BGRA;
printf("A");
}
}
printf("\n");
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
SDL_LockSurface(surface);
glTexImage2D(GL_TEXTURE_2D, 0, surface->format->BytesPerPixel, surface->w, surface->h, 0, format, GL_UNSIGNED_BYTE, surface->pixels);
SDL_UnlockSurface(surface);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
return texture;
}
/*
GLuint SDL_GL_NPOTSurfaceToTexture(SDL_Surface * surface, GLfloat * wratio, GLfloat * hratio) {
SDL_Surface * pow2 = NULL;
unsigned int w = NextPow2(surface->w);
unsigned int h = NextPow2(surface->h);
if (wratio) {
*wratio = (GLfloat)surface->w / (GLfloat)h;
}
if (hratio) {
*hratio = (GLfloat)surface->h/(GLfloat)h;
}
pow2 = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, surface->format->BitsPerPixel, surface->format->Rmask, surface->format->Gmask, surface->format->Bmask, surface->format->Amask);
SDL_BlitSurface(surface, NULL, pow2, NULL);
SDL_FreeSurface(surface);
return SDL_GL_SurfaceToTexture(pow2);
}*/
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