74 lines
No EOL
2.6 KiB
C
74 lines
No EOL
2.6 KiB
C
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typedef struct Circle {
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Vector2 pos;
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float radius;
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} Circle;
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int entry(int argc, char **argv) {
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window.title = STR("Minimal Game Example");
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window.scaled_width = 1280; // We need to set the scaled size if we want to handle system scaling (DPI)
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window.scaled_height = 720;
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window.x = 200;
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window.y = 90;
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window.clear_color = hex_to_rgba(0x6495EDff);
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Circle *circles;
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growing_array_init((void**)&circles, sizeof(Circle), get_heap_allocator());
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const int num_circles = 10000;
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const float radius_min = 8.0;
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const float radius_max = 32.0;
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const float hover_radius = 200;
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os_update(); // We set scaled window size, os_update updates the pixel window size values for us
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for (int i = 0; i < num_circles; i++) {
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Circle c;
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c.radius = get_random_float32_in_range(radius_min, radius_max);
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c.pos.x = get_random_float32_in_range(-(f32)window.width/2.0+c.radius, (f32)window.width/2.0-c.radius);
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c.pos.y = get_random_float32_in_range(-(f32)window.height/2.0+c.radius, (f32)window.height/2.0-c.radius);
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growing_array_add((void**)&circles, &c);
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assert(circles[i].radius == c.radius);
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assert(circles[i].pos.x == c.pos.x);
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assert(circles[i].pos.y == c.pos.y);
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}
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float64 last_time = os_get_current_time_in_seconds();
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while (!window.should_close) {
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float64 now = os_get_current_time_in_seconds();
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if ((int)now != (int)last_time) log("%.2f FPS\n%.2fms", 1.0/(now-last_time), (now-last_time)*1000);
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last_time = now;
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reset_temporary_storage();
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draw_frame.projection = m4_make_orthographic_projection(window.pixel_width * -0.5, window.pixel_width * 0.5, window.pixel_height * -0.5, window.pixel_height * 0.5, -1, 10);
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float mx = input_frame.mouse_x - window.width/2;
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float my = input_frame.mouse_y - window.height/2;
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// We build an array on the fly each frame for all the hovered circles
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Circle *circles_hovered;
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growing_array_init_reserve((void**)&circles_hovered, sizeof(Circle), num_circles, get_temporary_allocator());
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for (int i = 0; i < num_circles; i++) {
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float distance = v2_length(v2_sub(v2(mx, my), circles[i].pos));
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if (distance <= hover_radius) {
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growing_array_add((void**)&circles_hovered, &circles[i]);
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}
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}
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for (int i = 0; i < growing_array_get_valid_count(circles_hovered); i++) {
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Circle c = circles_hovered[i];
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draw_circle(v2_sub(c.pos, v2(c.radius, c.radius)), v2(c.radius, c.radius), COLOR_GREEN);
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}
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os_update();
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gfx_update();
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}
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return 0;
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} |