void SpriteAtlas::draw( PrimitiveBatch* batch, const Vector2& pos, uint32 sprite_idx ) const
{
if( sprite_idx < num_sprites() )
{
TexturedQuad2D q = m_sprites[sprite_idx];
q.pos[0] += pos;
q.pos[1] += pos;
q.pos[2] += pos;
q.pos[3] += pos;
batch->draw_textured_quad(&q, m_texture);
}
}
SpriteAtlas::SpriteAtlas( RenderDevice* device, uint32 sprite_width, uint32 sprite_height, const char* filename )
: m_device(device)
, m_sprite_size(float(sprite_width), float(sprite_height))
, m_texture_size(1,1)
, m_num_sprites_x(0)
, m_num_sprites_y(0)
{
Gfx_AddReference(m_device);
m_texture = Gfx_Texture_Load(m_device, filename);
TextureDescr descr = Gfx_Texture_Descr(m_device, m_texture);
m_texture_size.x = float(descr.width);
m_texture_size.y = float(descr.height);
m_num_sprites_x = descr.width / sprite_width;
m_num_sprites_y = descr.height / sprite_height;
m_sprites.resize(num_sprites());
for(uint32 y=0; y<m_num_sprites_y; ++y)
{
for(uint32 x=0; x<m_num_sprites_x; ++x)
{
TexturedQuad2D& q = m_sprites[x + y*m_num_sprites_x];
float w = m_sprite_size.x;
float h = m_sprite_size.y;
float tx = float(x)*m_sprite_size.x / m_texture_size.x;
float ty = float(y)*m_sprite_size.x / m_texture_size.y;
float tw = m_sprite_size.x / m_texture_size.x;
float th = m_sprite_size.y / m_texture_size.y;
q.pos[0] = Vector2(0, 0);
q.pos[1] = Vector2(w, 0);
q.pos[2] = Vector2(w, h);
q.pos[3] = Vector2(0, h);
q.tex[0] = Vector2(tx, ty);
q.tex[1] = Vector2(tx+tw, ty);
q.tex[2] = Vector2(tx+tw, ty+th);
q.tex[3] = Vector2(tx, ty+th);
}
}
}
StringId64 get_sprite_id(const PackageResource* pr, uint32_t i)
{
CE_ASSERT(i < num_sprites(pr), "Index out of bounds");
StringId64* begin = (StringId64*) ((char*)pr + pr->sprites_offset);
return begin[i];
}
