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More efficient light handling; sort lights by highest priority first

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This commit is contained in:
rdb 2017-05-15 16:58:56 +02:00
parent a71a89acc2
commit 68be3c6dfe
5 changed files with 179 additions and 230 deletions
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135
panda/src/display/graphicsStateGuardian.cxx
View File

@ -1092,23 +1092,12 @@ fetch_specified_part(Shader::ShaderMatInput part, InternalName *name,
const LightAttrib *target_light = (const LightAttrib *)
_target_rs->get_attrib_def(LightAttrib::get_class_slot());
int num_on_lights = target_light->get_num_on_lights();
if (num_on_lights == 0) {
if (!target_light->has_any_on_light()) {
// There are no lights at all. This means, to follow the fixed-
// function model, we pretend there is an all-white ambient light.
t.set_row(3, LVecBase4(1, 1, 1, 1));
} else {
for (int li = 0; li < num_on_lights; li++) {
NodePath light = target_light->get_on_light(li);
nassertr(!light.is_empty(), &LMatrix4::zeros_mat());
Light *light_obj = light.node()->as_light();
nassertr(light_obj != (Light *)NULL, &LMatrix4::zeros_mat());
if (light_obj->is_ambient_light()) {
cur_ambient_light += light_obj->get_color();
}
}
t.set_row(3, cur_ambient_light);
t.set_row(3, target_light->get_ambient_contribution());
}
return &t;
}
@ -1374,28 +1363,20 @@ fetch_specified_part(Shader::ShaderMatInput part, InternalName *name,
const LightAttrib *target_light;
_target_rs->get_attrib_def(target_light);
// We want to ignore ambient lights. To that effect, iterate through the
// list of lights. In the future, we will improve this system, by also
// filtering down to the number of lights specified by the shader.
int i = 0;
int num_on_lights = target_light->get_num_on_lights();
for (int li = 0; li < num_on_lights; li++) {
NodePath light = target_light->get_on_light(li);
// We don't count ambient lights, which would be pretty silly to handle
// via this mechanism.
size_t num_lights = target_light->get_num_non_ambient_lights();
if (index >= 0 && (size_t)index < num_lights) {
NodePath light = target_light->get_on_light((size_t)index);
nassertr(!light.is_empty(), &LMatrix4::ident_mat());
Light *light_obj = light.node()->as_light();
nassertr(light_obj != (Light *)NULL, &LMatrix4::ident_mat());
nassertr(light_obj != nullptr, &LMatrix4::ident_mat());
if (!light_obj->is_ambient_light()) {
if (i++ == index) {
return fetch_specified_member(light, name, t);
}
}
}
return fetch_specified_member(light, name, t);
// Apply the default OpenGL lights otherwise.
// Special exception for light 0, which defaults to white.
if (index == 0) {
} else if (index == 0) {
// Apply the default OpenGL lights otherwise.
// Special exception for light 0, which defaults to white.
string basename = name->get_basename();
if (basename == "color" || basename == "diffuse") {
t.set_row(3, _light_color_scale);
@ -1776,35 +1757,28 @@ fetch_specified_texture(Shader::ShaderTexSpec &spec, SamplerState &sampler,
const LightAttrib *target_light;
_target_rs->get_attrib_def(target_light);
// We want to ignore ambient lights. To that effect, iterate through
// the list of lights. In the future, we will improve this system, by
// also filtering down to the number of lights specified by the shader.
int i = 0;
int num_on_lights = target_light->get_num_on_lights();
for (int li = 0; li < num_on_lights; li++) {
NodePath light = target_light->get_on_light(li);
nassertr(!light.is_empty(), NULL);
// We don't count ambient lights, which would be pretty silly to handle
// via this mechanism.
size_t num_lights = target_light->get_num_non_ambient_lights();
if (spec._stage >= 0 && (size_t)spec._stage < num_lights) {
NodePath light = target_light->get_on_light((size_t)spec._stage);
nassertr(!light.is_empty(), nullptr);
Light *light_obj = light.node()->as_light();
nassertr(light_obj != (Light *)NULL, NULL);
nassertr(light_obj != nullptr, nullptr);
if (!light_obj->is_ambient_light()) {
if (i++ == spec._stage) {
PT(Texture) tex = get_shadow_map(light);
if (tex != (Texture *)NULL) {
sampler = tex->get_default_sampler();
}
return tex;
}
PT(Texture) tex = get_shadow_map(light);
if (tex != nullptr) {
sampler = tex->get_default_sampler();
}
return tex;
} else {
// There is no such light assigned. Bind a dummy shadow map.
PT(Texture) tex = get_dummy_shadow_map((Texture::TextureType)spec._desired_type);
if (tex != nullptr) {
sampler = tex->get_default_sampler();
}
return tex;
}
// There is no such light assigned. Bind a dummy shadow map.
PT(Texture) tex = get_dummy_shadow_map((Texture::TextureType)spec._desired_type);
if (tex != nullptr) {
sampler = tex->get_default_sampler();
}
return tex;
}
break;
@ -2645,7 +2619,7 @@ do_issue_light() {
int i;
int num_enabled = 0;
int num_on_lights = 0;
bool any_on_lights = false;
const LightAttrib *target_light;
_target_rs->get_attrib_def(target_light);
@ -2654,18 +2628,16 @@ do_issue_light() {
display_cat.spam()
<< "do_issue_light: " << target_light << "\n";
}
if (target_light != (LightAttrib *)NULL) {
CPT(LightAttrib) new_light = target_light->filter_to_max(_max_lights);
if (display_cat.is_spam()) {
new_light->write(display_cat.spam(false), 2);
}
num_on_lights = new_light->get_num_on_lights();
for (int li = 0; li < num_on_lights; li++) {
NodePath light = new_light->get_on_light(li);
if (target_light != nullptr) {
// LightAttrib guarantees that the on lights are sorted, and that
// non-ambient lights come before ambient lights.
any_on_lights = target_light->has_any_on_light();
size_t filtered_lights = min((size_t)_max_lights, target_light->get_num_non_ambient_lights());
for (size_t li = 0; li < filtered_lights; ++li) {
NodePath light = target_light->get_on_light(li);
nassertv(!light.is_empty());
Light *light_obj = light.node()->as_light();
nassertv(light_obj != (Light *)NULL);
nassertv(light_obj != nullptr);
// Lighting should be enabled before we apply any lights.
if (!_lighting_enabled) {
@ -2673,23 +2645,16 @@ do_issue_light() {
_lighting_enabled = true;
}
if (light_obj->is_ambient_light()) {
// Ambient lights don't require specific light ids; simply add in the
// ambient contribution to the current total
cur_ambient_light += light_obj->get_color();
} else {
const LColor &color = light_obj->get_color();
// Don't bother binding the light if it has no color to contribute.
if (color[0] != 0.0 || color[1] != 0.0 || color[2] != 0.0) {
enable_light(num_enabled, true);
if (num_enabled == 0) {
begin_bind_lights();
}
light_obj->bind(this, light, num_enabled);
num_enabled++;
const LColor &color = light_obj->get_color();
// Don't bother binding the light if it has no color to contribute.
if (color[0] != 0.0 || color[1] != 0.0 || color[2] != 0.0) {
enable_light(num_enabled, true);
if (num_enabled == 0) {
begin_bind_lights();
}
light_obj->bind(this, light, num_enabled);
num_enabled++;
}
}
}
@ -2700,7 +2665,7 @@ do_issue_light() {
_num_lights_enabled = num_enabled;
// If no lights were set, disable lighting
if (num_on_lights == 0) {
if (!any_on_lights) {
if (_color_scale_via_lighting && (_has_material_force_color || _light_color_scale != LVecBase4(1.0f, 1.0f, 1.0f, 1.0f))) {
// Unless we need lighting anyway to apply a color or color scale.
if (!_lighting_enabled) {
@ -2717,7 +2682,7 @@ do_issue_light() {
}
} else {
set_ambient_light(cur_ambient_light);
set_ambient_light(target_light->get_ambient_contribution());
}
if (num_enabled != 0) {

49
panda/src/pgraph/lightAttrib.I
View File

@ -15,8 +15,7 @@
* Use LightAttrib::make() to construct a new LightAttrib object.
*/
INLINE LightAttrib::
LightAttrib() {
_off_all_lights = false;
LightAttrib() : _off_all_lights(false), _num_non_ambient_lights(0) {
}
/**
@ -27,25 +26,37 @@ INLINE LightAttrib::
LightAttrib(const LightAttrib &copy) :
_on_lights(copy._on_lights),
_off_lights(copy._off_lights),
_off_all_lights(copy._off_all_lights)
_off_all_lights(copy._off_all_lights),
_sort_seq(UpdateSeq::old())
{
}
/**
* Returns the number of lights that are turned on by the attribute.
*/
INLINE int LightAttrib::
INLINE size_t LightAttrib::
get_num_on_lights() const {
return _on_lights.size();
check_sorted();
return _sorted_on_lights.size();
}
/**
* Returns the number of non-ambient lights that are turned on by this
* attribute.
*/
INLINE size_t LightAttrib::
get_num_non_ambient_lights() const {
check_sorted();
return _num_non_ambient_lights;
}
/**
* Returns the nth light turned on by the attribute, sorted in render order.
*/
INLINE NodePath LightAttrib::
get_on_light(int n) const {
nassertr(n >= 0 && n < (int)_on_lights.size(), NodePath::fail());
return _on_lights[n];
get_on_light(size_t n) const {
nassertr(n < _sorted_on_lights.size(), NodePath::fail());
return _sorted_on_lights[n];
}
/**
@ -57,10 +68,18 @@ has_on_light(const NodePath &light) const {
return _on_lights.find(light) != _on_lights.end();
}
/**
* Returns true if any light is turned on by the attrib, false otherwise.
*/
INLINE bool LightAttrib::
has_any_on_light() const {
return !_on_lights.empty();
}
/**
* Returns the number of lights that are turned off by the attribute.
*/
INLINE int LightAttrib::
INLINE size_t LightAttrib::
get_num_off_lights() const {
return _off_lights.size();
}
@ -70,8 +89,8 @@ get_num_off_lights() const {
* (pointer) order.
*/
INLINE NodePath LightAttrib::
get_off_light(int n) const {
nassertr(n >= 0 && n < (int)_off_lights.size(), NodePath::fail());
get_off_light(size_t n) const {
nassertr(n < _off_lights.size(), NodePath::fail());
return _off_lights[n];
}
@ -104,13 +123,11 @@ is_identity() const {
}
/**
* Confirms whether the _filtered table is still valid. It may become invalid
* if someone calls Light::set_priority().
*
* If the table is invalid, transparently empties it before returning.
* Makes sure that the on lights are still sorted by priority. It may become
* invalid if someone calls Light::set_priority().
*/
INLINE void LightAttrib::
check_filtered() const {
check_sorted() const {
if (_sort_seq != Light::get_sort_seq()) {
((LightAttrib *)this)->sort_on_lights();
}

147
panda/src/pgraph/lightAttrib.cxx
View File

@ -29,7 +29,7 @@ int LightAttrib::_attrib_slot;
CPT(RenderAttrib) LightAttrib::_all_off_attrib;
TypeHandle LightAttrib::_type_handle;
// This STL Function object is used in filter_to_max(), below, to sort a list
// This STL Function object is used in sort_on_lights(), below, to sort a list
// of Lights in reverse order by priority. In the case of two lights with
// equal priority, the class priority is compared.
class CompareLightPriorities {
@ -430,80 +430,6 @@ remove_off_light(const NodePath &light) const {
return return_new(attrib);
}
/**
* Returns a new LightAttrib, very much like this one, but with the number of
* on_lights reduced to be no more than max_lights. The number of off_lights
* in the new LightAttrib is undefined.
*
* The number of AmbientLights is not included in the count. All
* AmbientLights in the original attrib are always included in the result,
* regardless of the value of max_lights.
*/
CPT(LightAttrib) LightAttrib::
filter_to_max(int max_lights) const {
if (max_lights < 0 || (int)_on_lights.size() <= max_lights) {
// Trivial case: this LightAttrib qualifies.
return this;
}
// Since check_filtered() will clear the _filtered list if we are out of
// date, we should call it first.
check_filtered();
Filtered::const_iterator fi;
fi = _filtered.find(max_lights);
if (fi != _filtered.end()) {
// Easy case: we have already computed this for this particular
// LightAttrib.
return (*fi).second;
}
// Harder case: we have to compute it now. We must choose the n lights with
// the highest priority in our list of lights.
Lights priority_lights, ambient_lights;
// Separate the list of lights into ambient lights and other lights.
Lights::const_iterator li;
for (li = _on_lights.begin(); li != _on_lights.end(); ++li) {
const NodePath &np = (*li);
nassertr(!np.is_empty() && np.node()->as_light() != (Light *)NULL, this);
if (np.node()->is_ambient_light()) {
ambient_lights.push_back(np);
} else {
priority_lights.push_back(np);
}
}
// This sort function uses the STL function object defined above.
sort(priority_lights.begin(), priority_lights.end(),
CompareLightPriorities());
// Now lop off all of the lights after the first max_lights.
if ((int)priority_lights.size() > max_lights) {
priority_lights.erase(priority_lights.begin() + max_lights,
priority_lights.end());
}
// Put the ambient lights back into the list.
for (li = ambient_lights.begin(); li != ambient_lights.end(); ++li) {
priority_lights.push_back(*li);
}
// And re-sort the ov_set into its proper order.
priority_lights.sort();
// Now create a new attrib reflecting these lights.
PT(LightAttrib) attrib = new LightAttrib;
attrib->_on_lights.swap(priority_lights);
CPT(RenderAttrib) new_attrib = return_new(attrib);
// Finally, record this newly-created attrib in the map for next time.
CPT(LightAttrib) light_attrib = (const LightAttrib *)new_attrib.p();
((LightAttrib *)this)->_filtered[max_lights] = light_attrib;
return light_attrib;
}
/**
* Returns the most important light (that is, the light with the highest
* priority) in the LightAttrib, excluding any ambient lights. Returns an
@ -511,22 +437,35 @@ filter_to_max(int max_lights) const {
*/
NodePath LightAttrib::
get_most_important_light() const {
NodePath best;
check_sorted();
CompareLightPriorities compare;
if (_num_non_ambient_lights > 0) {
return _sorted_on_lights[0];
} else {
return NodePath();
}
}
/**
* Returns the total contribution of all the ambient lights.
*/
LColor LightAttrib::
get_ambient_contribution() const {
check_sorted();
LVecBase4 total(0);
Lights::const_iterator li;
for (li = _on_lights.begin(); li != _on_lights.end(); ++li) {
li = _sorted_on_lights.begin() + _num_non_ambient_lights;
for (; li != _sorted_on_lights.end(); ++li) {
const NodePath &np = (*li);
nassertr(!np.is_empty() && np.node()->as_light() != (Light *)NULL, NodePath());
if (!np.node()->is_ambient_light()) {
if (best.is_empty() || compare(np, best)) {
best = np;
}
}
Light *light = np.node()->as_light();
nassertd(light != nullptr && light->is_ambient_light()) continue;
total += light->get_color();
}
return best;
return total;
}
/**
@ -869,13 +808,42 @@ get_auto_shader_attrib_impl(const RenderState *state) const {
}
/**
* This is patterned after TextureAttrib::sort_on_stages(), but since lights
* don't actually require sorting, this only empties the _filtered map.
* Makes sure the lights are sorted in order of priority. Also counts the
* number of non-ambient lights.
*/
void LightAttrib::
sort_on_lights() {
_sort_seq = Light::get_sort_seq();
_filtered.clear();
// Separate the list of lights into ambient lights and other lights.
_sorted_on_lights.clear();
OrderedLights ambient_lights;
Lights::const_iterator li;
for (li = _on_lights.begin(); li != _on_lights.end(); ++li) {
const NodePath &np = (*li);
nassertd(!np.is_empty() && np.node()->as_light() != nullptr) continue;
if (!np.node()->is_ambient_light()) {
_sorted_on_lights.push_back(np);
} else {
ambient_lights.push_back(np);
}
}
// Remember how many lights were non-ambient lights, which makes it easier
// to traverse through the list of non-ambient lights.
_num_non_ambient_lights = _sorted_on_lights.size();
// This sort function uses the STL function object defined above.
sort(_sorted_on_lights.begin(), _sorted_on_lights.end(),
CompareLightPriorities());
// Now insert the ambient lights back at the end. We don't really care
// about their relative priorities, because their contribution will simply
// be summed up in the end anyway.
_sorted_on_lights.insert(_sorted_on_lights.end(),
ambient_lights.begin(), ambient_lights.end());
}
/**
@ -1085,4 +1053,7 @@ fillin(DatagramIterator &scan, BamReader *manager) {
aux->_num_on_lights = scan.get_uint16();
manager->read_pointers(scan, aux->_num_on_lights);
}
_sorted_on_lights.clear();
_sort_seq = UpdateSeq::old();
}

24
panda/src/pgraph/lightAttrib.h
View File

@ -67,13 +67,15 @@ PUBLISHED:
static CPT(RenderAttrib) make();
static CPT(RenderAttrib) make_all_off();
INLINE int get_num_on_lights() const;
INLINE NodePath get_on_light(int n) const;
INLINE size_t get_num_on_lights() const;
INLINE size_t get_num_non_ambient_lights() const;
INLINE NodePath get_on_light(size_t n) const;
MAKE_SEQ(get_on_lights, get_num_on_lights, get_on_light);
INLINE bool has_on_light(const NodePath &light) const;
INLINE bool has_any_on_light() const;
INLINE int get_num_off_lights() const;
INLINE NodePath get_off_light(int n) const;
INLINE size_t get_num_off_lights() const;
INLINE NodePath get_off_light(size_t n) const;
MAKE_SEQ(get_off_lights, get_num_off_lights, get_off_light);
INLINE bool has_off_light(const NodePath &light) const;
INLINE bool has_all_off() const;
@ -85,8 +87,11 @@ PUBLISHED:
CPT(RenderAttrib) add_off_light(const NodePath &light) const;
CPT(RenderAttrib) remove_off_light(const NodePath &light) const;
CPT(LightAttrib) filter_to_max(int max_lights) const;
NodePath get_most_important_light() const;
LColor get_ambient_contribution() const;
MAKE_SEQ_PROPERTY(on_lights, get_num_on_lights, get_on_light);
MAKE_SEQ_PROPERTY(off_lights, get_num_off_lights, get_off_light);
public:
virtual void output(ostream &out) const;
@ -100,7 +105,7 @@ protected:
virtual CPT(RenderAttrib) get_auto_shader_attrib_impl(const RenderState *state) const;
private:
INLINE void check_filtered() const;
INLINE void check_sorted() const;
void sort_on_lights();
private:
@ -108,8 +113,11 @@ private:
Lights _on_lights, _off_lights;
bool _off_all_lights;
typedef pmap< int, CPT(LightAttrib) > Filtered;
Filtered _filtered;
// These are sorted in descending order of priority, with the ambient lights
// sorted last.
typedef pvector<NodePath> OrderedLights;
OrderedLights _sorted_on_lights;
size_t _num_non_ambient_lights;
UpdateSeq _sort_seq;

54
panda/src/tinydisplay/tinyGraphicsStateGuardian.cxx
View File

@ -1734,11 +1734,7 @@ release_texture(TextureContext *tc) {
*/
void TinyGraphicsStateGuardian::
do_issue_light() {
// Initialize the current ambient light total and newly enabled light list
LColor cur_ambient_light(0.0f, 0.0f, 0.0f, 0.0f);
int num_enabled = 0;
int num_on_lights = 0;
const LightAttrib *target_light = DCAST(LightAttrib, _target_rs->get_attrib_def(LightAttrib::get_class_slot()));
if (display_cat.is_spam()) {
@ -1750,43 +1746,35 @@ do_issue_light() {
clear_light_state();
// Now, assign new lights.
if (target_light != (LightAttrib *)NULL) {
CPT(LightAttrib) new_light = target_light->filter_to_max(_max_lights);
if (display_cat.is_spam()) {
new_light->write(display_cat.spam(false), 2);
}
num_on_lights = new_light->get_num_on_lights();
for (int li = 0; li < num_on_lights; li++) {
NodePath light = new_light->get_on_light(li);
nassertv(!light.is_empty());
Light *light_obj = light.node()->as_light();
nassertv(light_obj != (Light *)NULL);
if (target_light != nullptr) {
if (target_light->has_any_on_light()) {
_lighting_enabled = true;
_c->lighting_enabled = true;
}
if (light_obj->get_type() == AmbientLight::get_class_type()) {
// Accumulate all of the ambient lights together into one.
cur_ambient_light += light_obj->get_color();
size_t filtered_lights = min((size_t)_max_lights, target_light->get_num_non_ambient_lights());
for (size_t li = 0; li < filtered_lights; ++li) {
NodePath light = target_light->get_on_light(li);
nassertv(!light.is_empty());
Light *light_obj = light.node()->as_light();
nassertv(light_obj != nullptr);
} else {
// Other kinds of lights each get their own GLLight object.
light_obj->bind(this, light, num_enabled);
num_enabled++;
// Other kinds of lights each get their own GLLight object.
light_obj->bind(this, light, num_enabled);
num_enabled++;
// Handle the diffuse color here, since all lights have this property.
GLLight *gl_light = _c->first_light;
nassertv(gl_light != NULL);
const LColor &diffuse = light_obj->get_color();
gl_light->diffuse.v[0] = diffuse[0];
gl_light->diffuse.v[1] = diffuse[1];
gl_light->diffuse.v[2] = diffuse[2];
gl_light->diffuse.v[3] = diffuse[3];
}
// Handle the diffuse color here, since all lights have this property.
GLLight *gl_light = _c->first_light;
nassertv(gl_light != NULL);
const LColor &diffuse = light_obj->get_color();
gl_light->diffuse.v[0] = diffuse[0];
gl_light->diffuse.v[1] = diffuse[1];
gl_light->diffuse.v[2] = diffuse[2];
gl_light->diffuse.v[3] = diffuse[3];
}
}
LColor cur_ambient_light = target_light->get_ambient_contribution();
_c->ambient_light_model.v[0] = cur_ambient_light[0];
_c->ambient_light_model.v[1] = cur_ambient_light[1];
_c->ambient_light_model.v[2] = cur_ambient_light[2];