std::pair<ShaderID, bool> ResourceManagerImpl::find_shader(const std::string& name) {
std::map<std::string, ShaderID>::const_iterator it = shader_lookup_.find(name);
if(it == shader_lookup_.end()) {
return std::make_pair(ShaderID(), false);
}
return std::make_pair((*it).second, true);
}
uint32 Renderer_GL44::render_state_switch(RenderState& current, RenderCommand_GL44* commands, uint32 max_count)
{
auto batch_key = SortKey_GL44::Decode(commands->sort_key);
auto cmd_data = static_cast<DefaultCommandData*>(commands->data);
auto sk = batch_key.fields;
auto& gd = m_geometry_data[cmd_data->geometry.value()];
auto& gcd = *m_geometry_config_data.data(gd.geometry_config_id.value());
auto& sd = m_shader_backend.m_shader_data[sk.material];
current.index_type = gcd.index_type;
current.primitive_type = gcd.primitive;
bool layout_changed = gcd.layout != current.vertex_layout;
bool shader_changed = sk.material != current.shader.value();
bool buffer_changed = sk.buffer != (uint8)current.buffer;
// compute size of next batch
uint32 max_batch_size = std::min(max_count, sd.maximum_batch_size);
uint32 batch_size = 1;
auto batch_key_dm = batch_key; batch_key_dm.fields.depth = 0;
for (uint32 i = 1; i < max_batch_size; i++)
{
// check if this draw call fits into the same draw batch
auto current_key_dm = SortKey_GL44::Decode(commands[i].sort_key);
current_key_dm.fields.depth = 0;
if (current_key_dm.integer != batch_key_dm.integer) break;
batch_size += 1;
}
// if the shader has changed
if (shader_changed)
{
gl::use_program(sd.gl_program_id);
current.shader = ShaderID(sk.material);
m_shader_backend.m_iu_submission.set_shader(sd);
}
// instance uniform manager needs to know that a new batch begins
m_shader_backend.m_iu_submission.batch_begin(batch_size);
// if any of the two has changed we need to configure the mapping
if (shader_changed || layout_changed)
{
for (uint32 i = 0; i < sd.vertex_attributes_count; i++)
{
auto& sh_att = sd.vertex_attributes[i];
auto vl_att_ptr = gcd.layout->find_attribute(sh_att.name); // TODO: faster?
if (vl_att_ptr == nullptr)
{
LOG_WARNING("unmapped shader vertex property");
gl::disable_vertex_attribute(sh_att.location);
continue;
}
auto& vl_att = *vl_att_ptr;
gl::enable_vertex_attribute(sh_att.location);
// floating point shader input
if (sh_att.is_float_type)
{
gl::vertex_attrib_format(
sh_att.location,
vl_att.elements(),
type_gl(vl_att.type()),
type_normalize(vl_att.type()),
vl_att.offset());
}
// integer shader input
else
{
gl::vertex_attrib_i_format(
sh_att.location,
vl_att.elements(),
type_gl(vl_att.type()),
vl_att.offset());
}
gl::vertex_attrib_binding(sh_att.location, DEFAULT_BINDING_INDEX_GL);
}
}
// if the buffer has changed
if (buffer_changed || layout_changed)
{
uint32 gl_buffer = m_geom_buffer_gl_ids[(uint32)sk.buffer];
if (buffer_changed)
{
gl::bind_buffer(gl::BufferType::ElementArray, gl_buffer);
current.buffer = (GeometryBufferType)sk.buffer;
}
gl::bind_vertex_buffer(DEFAULT_BINDING_INDEX_GL, gl_buffer, 0, gcd.layout->stride());
current.vertex_layout = gcd.layout;
}
// TODO minimize shader/layout state changes
return batch_size;
}