Exemplo n.º 1
0
// 根据 render_state 绘制原始三角形
void device_draw_primitive(device_t *device, const vertex_t *v1,
	const vertex_t *v2, const vertex_t *v3) {
	point_t p1, p2, p3, c1, c2, c3;
	int render_state = device->render_state;

	// 按照 Transform 变化
	transform_apply(&device->transform, &c1, &v1->pos);
	transform_apply(&device->transform, &c2, &v2->pos);
	transform_apply(&device->transform, &c3, &v3->pos);

	// 裁剪,注意此处可以完善为具体判断几个点在 cvv内以及同cvv相交平面的坐标比例
	// 进行进一步精细裁剪,将一个分解为几个完全处在 cvv内的三角形
	if (transform_check_cvv(&c1) != 0) return;
	if (transform_check_cvv(&c2) != 0) return;
	if (transform_check_cvv(&c3) != 0) return;

	// 归一化
	transform_homogenize(&device->transform, &p1, &c1);
	transform_homogenize(&device->transform, &p2, &c2);
	transform_homogenize(&device->transform, &p3, &c3);

	// 纹理或者色彩绘制
	if (render_state & (RENDER_STATE_TEXTURE | RENDER_STATE_COLOR)) {
		vertex_t t1 = *v1, t2 = *v2, t3 = *v3;
		trapezoid_t traps[2];
		int n;

		t1.pos = p1;
		t2.pos = p2;
		t3.pos = p3;
		t1.pos.w = c1.w;
		t2.pos.w = c2.w;
		t3.pos.w = c3.w;

		vertex_rhw_init(&t1);	// 初始化 w
		vertex_rhw_init(&t2);	// 初始化 w
		vertex_rhw_init(&t3);	// 初始化 w

		// 拆分三角形为0-2个梯形,并且返回可用梯形数量
		n = trapezoid_init_triangle(traps, &t1, &t2, &t3);

		if (n >= 1) device_render_trap(device, &traps[0]);
		if (n >= 2) device_render_trap(device, &traps[1]);
	}

	if (render_state & RENDER_STATE_WIREFRAME) {		// 线框绘制
		device_draw_line(device, (int)p1.x, (int)p1.y, (int)p2.x, (int)p2.y, device->foreground);
		device_draw_line(device, (int)p1.x, (int)p1.y, (int)p3.x, (int)p3.y, device->foreground);
		device_draw_line(device, (int)p3.x, (int)p3.y, (int)p2.x, (int)p2.y, device->foreground);
	}
}
Exemplo n.º 2
0
char character_buildAt(character_t* c, kindOf_building_t* t, float x, float y)
{
	if (!transform_check(&t->build, &c->inventory))
		return 0;

	character_delHome(c);

	building_t* b = world_addBuilding(c->w, x, y, t, c);
	if (b == NULL)
		return 0;

	transform_apply(&t->build, &c->inventory, 1);
	c->hasBuilding = b->o.uuid;
	return 1;
}