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#include <stdlib.h>
#include "SDL.h"
#include "SDL_opengl.h"
#include "glpong.h"
#include "ball.h"
static GLuint ball;
static GLfloat ball_width;
static GLfloat ball_height;
#ifdef DEBUG
int
length(Ball_t * balls) {
if (balls == NULL) {
return 0;
} else {
return 1 + length(balls->next);
}
}
#endif
void
GLPong_BallInit() {
ball_width = GLPONG_WIDTH / 32.0f; /* FIXME: magic numbers */
ball_height = GLPONG_HEIGHT / 24.0f;
ball = glGenLists(1);
glNewList(ball, GL_COMPILE);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f( 0.0f, 0.0f); /* Lower Left */
glTexCoord2f(1.0f, 0.0f); glVertex2f(ball_width, 0.0f); /* Lower Right */
glTexCoord2f(1.0f, 1.0f); glVertex2f(ball_width, ball_height); /* Upper Right */
glTexCoord2f(0.0f, 1.0f); glVertex2f( 0.0f, ball_height); /* Upper Left */
glEnd();
glEndList();
}
void
GLPong_BallDeinit() {
glDeleteLists(ball, 1);
}
void
GLPong_BallAdd(Ball_t ** balls) {
Ball_t * newball = NULL;
newball = malloc(sizeof(Ball_t));
if (newball) {
#ifdef DEBUG
puts("Ball created.\n");
#endif
newball->next = *balls;
newball->x = 100.0f;
newball->y = 100.0f;
newball->xv = GLPONG_WIDTH / (GLfloat)320; /* FIXME: magic numbers */
newball->yv = GLPONG_HEIGHT / (GLfloat)240;
newball->r = rand() % 255;
newball->g = rand() % 255;
newball->b = rand() % 255;
newball->a = SDL_ALPHA_OPAQUE;
*balls = newball;
} else {
#ifdef DEBUG
fputs("Cannot create ball: malloc failure.\n", stderr);
#endif
}
}
void
GLPong_BallDelete(Ball_t * from, Ball_t * ball) {
Ball_t * temp = NULL;
while (from) {
if (from == ball) {
temp = ball;
from->next = ball->next;
free(ball);
break;
}
from = from->next;
}
}
void
GLPong_BallDeleteAll(Ball_t * list) {
if (list) {
GLPong_BallDeleteAll(list->next);
free(list);
}
}
int
GLPong_BallCollide(const Ball_t * a, const Ball_t * b) {
if ( b->x + ball_width < a->x ) return 0;
if ( b->x > a->x + ball_width ) return 0;
if ( b->y + ball_height < a->y ) return 0;
if ( b->y > a->y + ball_height ) return 0;
return 1;
}
void
GLPong_BallMoveAll(Ball_t ** balls) {
Ball_t * current = *balls;
while (current) {
#ifdef DEBUG
printf("current->x = %0.2f\ncurrent->y = %0.2f\n", current->x, current->y);
printf("current->xv = %0.2f\ncurrent->yv = %0.2f\n", current->xv, current->yv);
#endif
current->x += current->xv;
current->y += current->yv;
if (((current->y + ball_height) >= GLPONG_HEIGHT) || (current->y <= 0.0f)) {
current->yv = -current->yv;
}
if (((current->x + ball_width) >= GLPONG_WIDTH) || (current->x <= 0.0f)) {
current->xv = -current->xv;
}
current = current->next;
}
}
void
GLPong_BallDrawAll(Ball_t * balls) {
#ifdef DEBUG
printf("%d balls, draw all\n", length(balls));
#endif
glBindTexture(GL_TEXTURE_2D, ball_texture);
glEnable(GL_TEXTURE_2D);
while (balls) {
glLoadIdentity();
glTranslatef(balls->x, balls->y, 0);
glColor4ub(balls->r, balls->g, balls->b, balls->a);
glCallList(ball);
balls = balls->next;
}
glDisable(GL_TEXTURE_2D);
}
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