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open_toontown_panda3d/panda/src/egg2pg/eggRenderState.cxx

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/**
* PANDA 3D SOFTWARE
* Copyright (c) Carnegie Mellon University. All rights reserved.
*
* All use of this software is subject to the terms of the revised BSD
* license. You should have received a copy of this license along
* with this source code in a file named "LICENSE."
*
* @file eggRenderState.cxx
* @author drose
* @date 2005-03-12
*/
#include "eggRenderState.h"
#include "eggRenderMode.h"
#include "eggLine.h"
#include "eggPoint.h"
#include "textureAttrib.h"
#include "renderAttrib.h"
#include "eggTexture.h"
#include "texGenAttrib.h"
#include "internalName.h"
#include "eggCurve.h"
#include "eggSurface.h"
#include "cullBinAttrib.h"
#include "cullFaceAttrib.h"
#include "shadeModelAttrib.h"
#include "transparencyAttrib.h"
#include "depthWriteAttrib.h"
#include "depthTestAttrib.h"
#include "depthOffsetAttrib.h"
#include "texMatrixAttrib.h"
#include "renderModeAttrib.h"
#include "material.h"
#include "materialAttrib.h"
#include "materialPool.h"
#include "config_gobj.h"
#include "config_egg2pg.h"
/**
* Sets up the state as appropriate for the indicated primitive.
*/
void EggRenderState::
fill_state(EggPrimitive *egg_prim) {
// The various EggRenderMode properties can be defined directly at the
// primitive, at a group above the primitive, or an a texture applied to the
// primitive. The EggNode::determine_*() functions can find the right
// pointer to the level at which this is actually defined for a given
// primitive.
EggRenderMode::AlphaMode am = EggRenderMode::AM_unspecified;
EggRenderMode::DepthWriteMode dwm = EggRenderMode::DWM_unspecified;
EggRenderMode::DepthTestMode dtm = EggRenderMode::DTM_unspecified;
EggRenderMode::VisibilityMode vm = EggRenderMode::VM_unspecified;
bool implicit_alpha = false;
bool binary_alpha_only = true; // true if all alpha sources are binary alpha.
bool has_draw_order = false;
int draw_order = 0;
bool has_depth_offset = false;
int depth_offset = 0;
bool has_bin = false;
std::string bin;
EggRenderMode *render_mode;
render_mode = egg_prim->determine_alpha_mode();
if (render_mode != nullptr) {
am = render_mode->get_alpha_mode();
}
render_mode = egg_prim->determine_depth_write_mode();
if (render_mode != nullptr) {
dwm = render_mode->get_depth_write_mode();
}
render_mode = egg_prim->determine_depth_test_mode();
if (render_mode != nullptr) {
dtm = render_mode->get_depth_test_mode();
}
render_mode = egg_prim->determine_visibility_mode();
if (render_mode != nullptr) {
vm = render_mode->get_visibility_mode();
}
render_mode = egg_prim->determine_draw_order();
if (render_mode != nullptr) {
has_draw_order = true;
draw_order = render_mode->get_draw_order();
}
render_mode = egg_prim->determine_depth_offset();
if (render_mode != nullptr) {
has_depth_offset = true;
depth_offset = render_mode->get_depth_offset();
}
render_mode = egg_prim->determine_bin();
if (render_mode != nullptr) {
has_bin = true;
bin = render_mode->get_bin();
}
// add_attrib(TextureAttrib::make_off());
int num_textures = egg_prim->get_num_textures();
CPT(RenderAttrib) texture_attrib = nullptr;
CPT(RenderAttrib) tex_gen_attrib = nullptr;
CPT(RenderAttrib) tex_mat_attrib = nullptr;
TexMats tex_mats;
for (int i = 0; i < num_textures; i++) {
PT_EggTexture egg_tex = egg_prim->get_texture(i);
const TextureDef &def = _loader._textures[egg_tex];
if (def._texture != nullptr) {
if (texture_attrib == nullptr) {
texture_attrib = def._texture;
} else {
texture_attrib = texture_attrib->compose(def._texture);
}
if (egg_tex->affects_polygon_alpha()) {
const TextureAttrib *tex_attrib = DCAST(TextureAttrib, def._texture);
Texture *tex = tex_attrib->get_texture();
nassertv(tex != nullptr);
Texture::Format format = tex->get_format();
if (Texture::has_alpha(format) && !Texture::has_binary_alpha(format)) {
// This texture specifies a gradient alpha format.
binary_alpha_only = false;
}
if (am == EggRenderMode::AM_unspecified) {
// If neither the primitive nor the texture specified an alpha mode,
// assume it should be alpha'ed if the texture has an alpha channel
// (unless the texture environment type is one that doesn't apply
// its alpha to the result).
int num_components = tex->get_num_components();
if (egg_tex->has_alpha_channel(num_components)) {
implicit_alpha = true;
}
}
}
// Check for a texgen attrib.
bool has_tex_gen = false;
if (egg_tex->get_tex_gen() != EggTexture::TG_unspecified) {
has_tex_gen = true;
if (tex_gen_attrib == nullptr) {
tex_gen_attrib = TexGenAttrib::make();
}
tex_gen_attrib = DCAST(TexGenAttrib, tex_gen_attrib)->
add_stage(def._stage, get_tex_gen(egg_tex));
}
// Record the texture's associated texture matrix, so we can see if we
// can safely bake it into the UV's. (We need to get the complete list
// of textures that share this same set of UV's per each unique texture
// matrix. Whew!)
CPT(InternalName) uv_name;
if (egg_tex->has_uv_name() && egg_tex->get_uv_name() != std::string("default")) {
uv_name = InternalName::get_texcoord_name(egg_tex->get_uv_name());
} else {
uv_name = InternalName::get_texcoord();
}
if (has_tex_gen) {
// If the texture has a texgen mode, we will always apply its texture
// transform, never bake it in. In fact, we don't even care about its
// UV's in this case, since we won't be using them.
tex_mat_attrib = apply_tex_mat(tex_mat_attrib, def._stage, egg_tex);
}
else {
// Otherwise, we need to record that there is at least one texture on
// this particular UV name and with this particular texture matrix.
// If there are no other textures, or if all of the other textures use
// the same texture matrix, then tex_mats[uv_name].size() will remain
// 1 (which tells us we can bake in the texture matrix to the UV's).
// On the other hand, if there is another texture on the same uv name
// but with a different transform, it will increase
// tex_mats[uv_name].size() to at least 2, indicating we can't bake in
// the texture matrix.
tex_mats[uv_name][egg_tex->get_transform3d()].push_back(&def);
}
}
}
// These parametric primitive types can't have their UV's baked in, so if we
// have one of these we always need to apply the texture matrix as a
// separate attribute, regardless of how many textures share the particular
// UV set.
bool needs_tex_mat = (egg_prim->is_of_type(EggCurve::get_class_type()) ||
egg_prim->is_of_type(EggSurface::get_class_type()));
// Now that we've visited all of the textures in the above loop, we can go
// back and see how many of them share the same UV name and texture matrix.
TexMats::const_iterator tmi;
for (tmi = tex_mats.begin(); tmi != tex_mats.end(); ++tmi) {
const InternalName *uv_name = (*tmi).first;
const TexMatTransforms &tmt = (*tmi).second;
if (tmt.size() == 1 && !needs_tex_mat) {
// Only one unique transform sharing this set of UV's. We can bake in
// the transform!
const TexMatTextures &tmtex = (*tmt.begin()).second;
// The first EggTexture on the list is sufficient, since we know they
// all have the same transform.
nassertv(!tmtex.empty());
TexMatTextures::const_iterator tmtexi = tmtex.begin();
const EggTexture *egg_tex = (*tmtexi)->_egg_tex;
if (egg_tex->has_transform()) {
// If there's no transform, it's an identity matrix; don't bother
// recording it. Of course, it would do no harm to record it if we
// felt like it.
_bake_in_uvs[uv_name] = egg_tex;
}
} else {
// Multiple transforms on this UV set, or a geometry type that doesn't
// support baking in UV's. We have to apply the texture matrix to each
// stage.
TexMatTransforms::const_iterator tmti;
for (tmti = tmt.begin(); tmti != tmt.end(); ++tmti) {
const TexMatTextures &tmtex = (*tmti).second;
TexMatTextures::const_iterator tmtexi;
for (tmtexi = tmtex.begin(); tmtexi != tmtex.end(); ++tmtexi) {
const EggTexture *egg_tex = (*tmtexi)->_egg_tex;
TextureStage *stage = (*tmtexi)->_stage;
tex_mat_attrib = apply_tex_mat(tex_mat_attrib, stage, egg_tex);
}
}
}
}
if (texture_attrib != nullptr) {
add_attrib(texture_attrib);
}
if (tex_gen_attrib != nullptr) {
add_attrib(tex_gen_attrib);
}
if (tex_mat_attrib != nullptr) {
add_attrib(tex_mat_attrib);
}
if (egg_prim->has_material()) {
PT(EggMaterial) material = egg_prim->get_material();
CPT(RenderAttrib) mt =
get_material_attrib(material, egg_prim->get_bface_flag());
add_attrib(mt);
if (material->has_diff() && material->get_diff()[3] != 1.0) {
implicit_alpha = true;
binary_alpha_only = false;
}
}
// Also check the color of the primitive to see if we should assume alpha
// based on the alpha values specified in the egg file.
if (am == EggRenderMode::AM_unspecified) {
if (egg_prim->has_color()) {
if (egg_prim->get_color()[3] != 1.0) {
implicit_alpha = true;
binary_alpha_only = false;
}
}
EggPrimitive::const_iterator vi;
for (vi = egg_prim->begin();
!implicit_alpha && vi != egg_prim->end();
++vi) {
if ((*vi)->has_color()) {
if ((*vi)->get_color()[3] != 1.0) {
implicit_alpha = true;
binary_alpha_only = false;
}
}
}
if (implicit_alpha) {
am = EggRenderMode::AM_on;
}
}
switch (am) {
case EggRenderMode::AM_on:
// Alpha type "on" means to get the default transparency type.
if (binary_alpha_only) {
am = EggRenderMode::AM_binary;
} else if (egg_alpha_mode != EggRenderMode::AM_unspecified) {
am = egg_alpha_mode;
}
break;
case EggRenderMode::AM_blend:
case EggRenderMode::AM_ms:
case EggRenderMode::AM_ms_mask:
case EggRenderMode::AM_dual:
if (egg_implicit_alpha_binary) {
// Any of these modes gets implicitly downgraded to AM_binary, if all of
// the alpha sources only contribute a binary value to alpha.
if (binary_alpha_only) {
am = EggRenderMode::AM_binary;
}
}
break;
default:
break;
}
switch (am) {
case EggRenderMode::AM_on:
case EggRenderMode::AM_blend:
add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_alpha));
break;
case EggRenderMode::AM_blend_no_occlude:
add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_alpha));
add_attrib(DepthWriteAttrib::make(DepthWriteAttrib::M_off));
break;
case EggRenderMode::AM_ms:
add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_multisample));
break;
case EggRenderMode::AM_ms_mask:
add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_multisample_mask));
break;
case EggRenderMode::AM_binary:
add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_binary));
break;
case EggRenderMode::AM_dual:
add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_dual));
break;
case EggRenderMode::AM_premultiplied:
add_attrib(TransparencyAttrib::make(TransparencyAttrib::M_premultiplied_alpha));
break;
default:
break;
}
switch (dwm) {
case EggRenderMode::DWM_on:
add_attrib(DepthWriteAttrib::make(DepthWriteAttrib::M_on));
break;
case EggRenderMode::DWM_off:
add_attrib(DepthWriteAttrib::make(DepthWriteAttrib::M_off));
break;
default:
break;
}
switch (dtm) {
case EggRenderMode::DTM_on:
add_attrib(DepthTestAttrib::make(DepthTestAttrib::M_less));
break;
case EggRenderMode::DTM_off:
add_attrib(DepthTestAttrib::make(DepthTestAttrib::M_none));
break;
default:
break;
}
switch (vm) {
case EggRenderMode::VM_hidden:
_hidden = true;
break;
case EggRenderMode::VM_normal:
default:
break;
}
_flat_shaded =
(egg_flat_shading &&
egg_prim->get_connected_shading() == EggPrimitive::S_per_face);
if (_flat_shaded) {
add_attrib(ShadeModelAttrib::make(ShadeModelAttrib::M_flat));
}
if (egg_prim->is_of_type(EggLine::get_class_type())) {
_primitive_type = Geom::PT_lines;
EggLine *egg_line = DCAST(EggLine, egg_prim);
if (egg_line->get_thick() != 1.0) {
add_attrib(RenderModeAttrib::make(RenderModeAttrib::M_unchanged,
egg_line->get_thick()));
}
} else if (egg_prim->is_of_type(EggPoint::get_class_type())) {
_primitive_type = Geom::PT_points;
EggPoint *egg_point = DCAST(EggPoint, egg_prim);
if (egg_point->get_thick() != 1.0 || egg_point->get_perspective()) {
add_attrib(RenderModeAttrib::make(RenderModeAttrib::M_unchanged,
egg_point->get_thick(),
egg_point->get_perspective()));
}
} else {
_primitive_type = Geom::PT_polygons;
}
if (has_bin) {
add_attrib(CullBinAttrib::make(bin, draw_order));
} else if (has_draw_order) {
add_attrib(CullBinAttrib::make("fixed", draw_order));
}
if (has_depth_offset) {
add_attrib(DepthOffsetAttrib::make(depth_offset));
}
if (egg_prim->get_bface_flag()) {
// The primitive is marked with backface culling disabled--we want to see
// both sides.
add_attrib(CullFaceAttrib::make(CullFaceAttrib::M_cull_none));
}
}
/**
* Provides a unique ordering for different EggRenderState objects, so that
* primitives of similar state can be grouped together by the EggBinner.
*/
int EggRenderState::
compare_to(const EggRenderState &other) const {
if (_state != other._state) {
int c = _state->compare_to(*other._state);
if (c != 0) {
return c;
}
}
if (_hidden != other._hidden) {
return (int)_hidden - (int)other._hidden;
}
if (_flat_shaded != other._flat_shaded) {
return (int)_flat_shaded - (int)other._flat_shaded;
}
if (_primitive_type != other._primitive_type) {
return (int)_primitive_type - (int)other._primitive_type;
}
if (_bake_in_uvs.size() != other._bake_in_uvs.size()) {
return (int)_bake_in_uvs.size() - (int)other._bake_in_uvs.size();
}
BakeInUVs::const_iterator ai, bi;
ai = _bake_in_uvs.begin();
bi = other._bake_in_uvs.begin();
while (ai != _bake_in_uvs.end()) {
nassertr(bi != other._bake_in_uvs.end(), false);
if ((*ai).first != (*bi).first) {
return (*ai).first < (*bi).first ? -1 : 1;
}
if ((*ai).second != (*bi).second) {
return (*ai).second < (*bi).second ? -1 : 1;
}
++ai;
++bi;
}
nassertr(bi == other._bake_in_uvs.end(), false);
return 0;
}
/**
* Returns a RenderAttrib suitable for enabling the material indicated by the
* given EggMaterial, and with the indicated backface flag.
*/
CPT(RenderAttrib) EggRenderState::
get_material_attrib(const EggMaterial *egg_mat, bool bface) {
Materials &materials =
bface ? _loader._materials_bface : _loader._materials;
// First, check whether we've seen this material before.
Materials::const_iterator mi;
mi = materials.find(egg_mat);
if (mi != materials.end()) {
return (*mi).second;
}
// Ok, this is the first time we've seen this particular EggMaterial.
// Create a new Material that matches it.
PT(Material) mat = new Material(egg_mat->get_name());
if (egg_mat->has_base()) {
mat->set_base_color(egg_mat->get_base());
}
if (egg_mat->has_diff()) {
mat->set_diffuse(egg_mat->get_diff());
// By default, ambient is the same as diffuse, if diffuse is specified but
// ambient is not.
mat->set_ambient(egg_mat->get_diff());
}
if (egg_mat->has_amb()) {
mat->set_ambient(egg_mat->get_amb());
}
if (egg_mat->has_emit()) {
mat->set_emission(egg_mat->get_emit());
}
if (egg_mat->has_spec()) {
mat->set_specular(egg_mat->get_spec());
}
if (egg_mat->has_shininess()) {
mat->set_shininess(egg_mat->get_shininess());
}
if (egg_mat->has_roughness()) {
mat->set_roughness(egg_mat->get_roughness());
}
if (egg_mat->has_metallic()) {
mat->set_metallic(egg_mat->get_metallic());
}
if (egg_mat->has_ior()) {
mat->set_refractive_index(egg_mat->get_ior());
}
if (egg_mat->has_local()) {
mat->set_local(egg_mat->get_local());
}
mat->set_twoside(bface);
// Now get a global Material pointer, shared with other models.
Material *shared_mat = MaterialPool::get_material(mat);
// And create a MaterialAttrib for this Material.
CPT(RenderAttrib) mt = MaterialAttrib::make(shared_mat);
materials.insert(Materials::value_type(egg_mat, mt));
return mt;
}
/**
* Extracts the tex_gen from the given egg texture, and returns its
* corresponding TexGenAttrib mode.
*/
TexGenAttrib::Mode EggRenderState::
get_tex_gen(const EggTexture *egg_tex) {
switch (egg_tex->get_tex_gen()) {
case EggTexture::TG_unspecified:
return TexGenAttrib::M_off;
case EggTexture::TG_eye_sphere_map:
return TexGenAttrib::M_eye_sphere_map;
case EggTexture::TG_world_cube_map:
return TexGenAttrib::M_world_cube_map;
case EggTexture::TG_eye_cube_map:
return TexGenAttrib::M_eye_cube_map;
case EggTexture::TG_world_normal:
return TexGenAttrib::M_world_normal;
case EggTexture::TG_eye_normal:
return TexGenAttrib::M_eye_normal;
case EggTexture::TG_world_position:
return TexGenAttrib::M_world_position;
case EggTexture::TG_eye_position:
return TexGenAttrib::M_eye_position;
case EggTexture::TG_point_sprite:
return TexGenAttrib::M_point_sprite;
};
return TexGenAttrib::M_off;
}
/**
* Applies the texture matrix from the indicated egg texture to the given
* TexMatrixAttrib, and returns the new attrib.
*/
CPT(RenderAttrib) EggRenderState::
apply_tex_mat(CPT(RenderAttrib) tex_mat_attrib,
TextureStage *stage, const EggTexture *egg_tex) {
if (egg_tex->has_transform()) {
CPT(TransformState) transform = _loader.make_transform(egg_tex);
if (tex_mat_attrib == nullptr) {
tex_mat_attrib = TexMatrixAttrib::make();
}
tex_mat_attrib = DCAST(TexMatrixAttrib, tex_mat_attrib)->
add_stage(stage, transform);
}
return tex_mat_attrib;
}
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