void render_scene(void) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++) {
glPushMatrix();
glTranslatef(70.0, 0, 70.0);
glTranslatef(i*10.0, 0, j * 10.0);
glCallList(snowman_display_list);
glPopMatrix();
}
render_height_map();
render_wall();
render_sky();
render_tree();
glutSwapBuffers();
}
static void render_tree(qnode *root) {
if (root == NULL) {
return;
}
SDL_SetRenderDrawColor(gCore.renderer, 0x0, 0xff, 0x0, 0xff);
SDL_Rect rect = { .x = root->x, .y = root->y, .w = root->w, .h = root->h };
SDL_RenderDrawRect(gCore.renderer, &rect);
for (int i = 0; i < 4; i++) {
render_tree(root->children[i]);
}
}
bool core_initialize(int width, int height, int maxDepth, int maxObjectsPerNode) {
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf("[Error] Could not initialize SDL: %s\n", SDL_GetError());
return false;
}
gCore.window = SDL_CreateWindow("MC202 - Particle Collider",
SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_SHOWN);
if (gCore.window == NULL) {
printf("[Error] Could not create window: %s\n", SDL_GetError());
return false;
}
gCore.renderer = SDL_CreateRenderer(gCore.window, -1, SDL_RENDERER_SOFTWARE);
if (gCore.renderer == NULL) {
printf("[Error] Could not create a renderer for window: %s\n", SDL_GetError());
return false;
}
if (!IMG_Init(IMG_INIT_PNG)) {
printf("[Error] Could not initialize SDL Image: %s\n", IMG_GetError());
}
gCore.entities = list_create();
gCore.width = width;
gCore.height = height;
gCore.maxDepth = maxDepth;
gCore.maxObjectsPerNode = maxObjectsPerNode;
gCore.maxIterations = -1;
return true;
}
void core_insertObjects(list *initialObjects) {
list_concatenate(gCore.entities, initialObjects);
}
void core_render() {
SDL_Surface *windowSurface = SDL_GetWindowSurface(gCore.window);
SDL_Rect stretchRect;
render_tree(gCore.tree->root);
node *cur = gCore.entities->head;
while (cur != NULL) {
stretchRect.x = cur->b->x;
stretchRect.y = cur->b->y;
stretchRect.w = 2 * cur->b->radius;
stretchRect.h = 2 * cur->b->radius;
SDL_BlitScaled(cur->b->texture, NULL, windowSurface, &stretchRect);
cur = cur->next;
}
}
void render_tree(FILE *f, struct SkipQuadtree<Point>::Node *tree, size_t depth)
{
double x1 = tree->mid[0] - tree->radius;
double x2 = tree->mid[0] + tree->radius;
double y1 = tree->mid[1] - tree->radius;
double y2 = tree->mid[1] + tree->radius;
//square
if (depth < 1) fprintf(f, "4 setlinewidth\n");
else if (depth < 2) fprintf(f, "3 setlinewidth\n");
else if (depth < 4) fprintf(f, "2 setlinewidth\n");
else fprintf(f, "1 setlinewidth\n");
fprintf(f, "%.0f %.0f %.0f %.0f node-bounds\n", x1, x2, y1, y2);
if (!tree->nodes) {
fprintf(f, "%.0f %.0f draw-point\n", (*tree->pt)[0], (*tree->pt)[1]);
} else {
for (int i = 0; i < 4; ++i) {
if (tree->nodes[i]) render_tree(f, tree->nodes[i], depth+1);
}
}
}
int main(int argc, char **argv)
{
if (argc != 3) {
printf("usage: render_tree <input> <output>\n");
exit(1);
}
int pt_count;
FILE *f = fopen(argv[1], "r");
if (!f) {
printf("error: could not open points file: %s\n", argv[1]);
exit(1);
}
fscanf(f, "%d", &pt_count);
if (pt_count < 0) {
printf("error: invalid point count %d\n", pt_count);
exit(1);
}
Point *pts = new Point[pt_count];
double x, y;
for (int i = 0; i < pt_count; ++i) {
fscanf(f, "%lf, %lf", &x, &y);
pts[i][0] = x;
pts[i][1] = y;
}
fclose(f);
SkipQuadtree<Point> sqt(2, pts, pt_count);
printf("completed building tree...\n ");
f = fopen(argv[2], "w");
if (!f) {
printf("error: could not open output file: %s\n", argv[2]);
exit(1);
}
fprintf(f, "%%%%!PS-Adobe-2.0\n");
fprintf(f, "%%%%Pages: %d\n", sqt.levels.size());
fprintf(f, "/page-begin {\n");
fprintf(f, "gsave\n");
fprintf(f, "} def\n");
fprintf(f, "/page-end {\n");
fprintf(f, " grestore\n");
fprintf(f, " showpage\n");
fprintf(f, "} def\n");
//define point function for later
fprintf(f, "/draw-point {\n");
fprintf(f, " /y exch def\n");
fprintf(f, " /x exch def\n");
fprintf(f, " gsave\n");
fprintf(f, " newpath\n");
fprintf(f, " 0.5 0.5 0.7 setrgbcolor\n");
fprintf(f, " x y 2 0 360 arc\n");
fprintf(f, " closepath\n");
fprintf(f, " fill\n");
fprintf(f, " newpath\n");
fprintf(f, " 0.4 setgray\n");
fprintf(f, " x y 2 0 360 arc\n");
fprintf(f, " closepath\n");
fprintf(f, " stroke\n");
fprintf(f, " grestore\n");
fprintf(f, "} def\n");
//node bounding box
fprintf(f, "/node-bounds {\n");
fprintf(f, " /y2 exch def\n");
fprintf(f, " /y1 exch def\n");
fprintf(f, " /x2 exch def\n");
fprintf(f, " /x1 exch def\n");
fprintf(f, " gsave\n");
fprintf(f, " 0.7 setgray\n");
fprintf(f, " newpath\n");
fprintf(f, " x2 y2 moveto\n");
fprintf(f, " x1 y2 lineto\n");
fprintf(f, " x1 y1 lineto\n");
fprintf(f, " x2 y1 lineto\n");
fprintf(f, " closepath\n");
fprintf(f, " stroke \n");
fprintf(f, " grestore\n");
fprintf(f, "} def\n");
for (size_t i = 0; i < sqt.levels.size(); ++i) {
fprintf(f, "%%%%Page: %d\n", i + 1);
fprintf(f, "page-begin\n");
render_tree(f, sqt.levels[i], 0);
fprintf(f, "page-end\n");
}
fclose(f);
}
