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serenity/Userland/Libraries/LibGL/Lighting.cpp
Ben Wiederhake a55360781b LibGL: Move AK/Debug.h include to where it is used
2023-01-02 20:27:20 -05:00

557 lines
22 KiB
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/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2021, Stephan Unverwerth <s.unverwerth@serenityos.org>
* Copyright (c) 2022, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGL/GLContext.h>
namespace GL {
template<typename T>
void GLContext::get_light_param(GLenum light, GLenum pname, T* params)
{
auto const& light_state = m_light_states[light - GL_LIGHT0];
switch (pname) {
case GL_AMBIENT:
params[0] = light_state.ambient_intensity.x();
params[1] = light_state.ambient_intensity.y();
params[2] = light_state.ambient_intensity.z();
params[3] = light_state.ambient_intensity.w();
break;
case GL_DIFFUSE:
params[0] = light_state.diffuse_intensity.x();
params[1] = light_state.diffuse_intensity.y();
params[2] = light_state.diffuse_intensity.z();
params[3] = light_state.diffuse_intensity.w();
break;
case GL_SPECULAR:
params[0] = light_state.specular_intensity.x();
params[1] = light_state.specular_intensity.y();
params[2] = light_state.specular_intensity.z();
params[3] = light_state.specular_intensity.w();
break;
case GL_SPOT_DIRECTION:
params[0] = light_state.spotlight_direction.x();
params[1] = light_state.spotlight_direction.y();
params[2] = light_state.spotlight_direction.z();
break;
case GL_SPOT_EXPONENT:
*params = light_state.spotlight_exponent;
break;
case GL_SPOT_CUTOFF:
*params = light_state.spotlight_cutoff_angle;
break;
case GL_CONSTANT_ATTENUATION:
*params = light_state.constant_attenuation;
break;
case GL_LINEAR_ATTENUATION:
*params = light_state.linear_attenuation;
break;
case GL_QUADRATIC_ATTENUATION:
*params = light_state.quadratic_attenuation;
break;
}
}
template<typename T>
void GLContext::get_material_param(Face face, GLenum pname, T* params)
{
auto const& material = m_material_states[face];
switch (pname) {
case GL_AMBIENT:
params[0] = static_cast<T>(material.ambient.x());
params[1] = static_cast<T>(material.ambient.y());
params[2] = static_cast<T>(material.ambient.z());
params[3] = static_cast<T>(material.ambient.w());
break;
case GL_DIFFUSE:
params[0] = static_cast<T>(material.diffuse.x());
params[1] = static_cast<T>(material.diffuse.y());
params[2] = static_cast<T>(material.diffuse.z());
params[3] = static_cast<T>(material.diffuse.w());
break;
case GL_SPECULAR:
params[0] = static_cast<T>(material.specular.x());
params[1] = static_cast<T>(material.specular.y());
params[2] = static_cast<T>(material.specular.z());
params[3] = static_cast<T>(material.specular.w());
break;
case GL_EMISSION:
params[0] = static_cast<T>(material.emissive.x());
params[1] = static_cast<T>(material.emissive.y());
params[2] = static_cast<T>(material.emissive.z());
params[3] = static_cast<T>(material.emissive.w());
break;
case GL_SHININESS:
*params = material.shininess;
break;
}
}
void GLContext::gl_color_material(GLenum face, GLenum mode)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_color_material, face, mode);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(face != GL_FRONT
&& face != GL_BACK
&& face != GL_FRONT_AND_BACK,
GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(mode != GL_EMISSION
&& mode != GL_AMBIENT
&& mode != GL_DIFFUSE
&& mode != GL_SPECULAR
&& mode != GL_AMBIENT_AND_DIFFUSE,
GL_INVALID_ENUM);
m_color_material_face = face;
m_color_material_mode = mode;
m_light_state_is_dirty = true;
}
void GLContext::gl_get_light(GLenum light, GLenum pname, void* params, GLenum type)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_get_light, light, pname, params, type);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(light < GL_LIGHT0 || light > GL_LIGHT0 + m_device_info.num_lights, GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(pname == GL_AMBIENT || pname == GL_DIFFUSE || pname == GL_SPECULAR || pname == GL_SPOT_DIRECTION || pname == GL_SPOT_EXPONENT || pname == GL_SPOT_CUTOFF || pname == GL_CONSTANT_ATTENUATION || pname == GL_LINEAR_ATTENUATION || pname == GL_QUADRATIC_ATTENUATION), GL_INVALID_ENUM);
if (type == GL_FLOAT)
get_light_param<GLfloat>(light, pname, static_cast<GLfloat*>(params));
else if (type == GL_INT)
get_light_param<GLint>(light, pname, static_cast<GLint*>(params));
else
VERIFY_NOT_REACHED();
}
void GLContext::gl_get_material(GLenum face, GLenum pname, void* params, GLenum type)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_get_material, face, pname, params, type);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(!(pname == GL_AMBIENT || pname == GL_DIFFUSE || pname == GL_SPECULAR || pname == GL_EMISSION), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(face == GL_FRONT || face == GL_BACK), GL_INVALID_ENUM);
Face material_face = Front;
switch (face) {
case GL_FRONT:
material_face = Front;
break;
case GL_BACK:
material_face = Back;
break;
}
if (type == GL_FLOAT)
get_material_param<GLfloat>(material_face, pname, static_cast<GLfloat*>(params));
else if (type == GL_INT)
get_material_param<GLint>(material_face, pname, static_cast<GLint*>(params));
else
VERIFY_NOT_REACHED();
}
void GLContext::gl_light_model(GLenum pname, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_light_model, pname, x, y, z, w);
RETURN_WITH_ERROR_IF(pname != GL_LIGHT_MODEL_AMBIENT
&& pname != GL_LIGHT_MODEL_COLOR_CONTROL
&& pname != GL_LIGHT_MODEL_LOCAL_VIEWER
&& pname != GL_LIGHT_MODEL_TWO_SIDE,
GL_INVALID_ENUM);
auto lighting_params = m_rasterizer->light_model();
switch (pname) {
case GL_LIGHT_MODEL_AMBIENT:
lighting_params.scene_ambient_color = { x, y, z, w };
break;
case GL_LIGHT_MODEL_COLOR_CONTROL: {
auto color_control = static_cast<GLenum>(x);
RETURN_WITH_ERROR_IF(color_control != GL_SINGLE_COLOR && color_control != GL_SEPARATE_SPECULAR_COLOR, GL_INVALID_ENUM);
lighting_params.color_control = (color_control == GL_SINGLE_COLOR) ? GPU::ColorControl::SingleColor : GPU::ColorControl::SeparateSpecularColor;
break;
}
case GL_LIGHT_MODEL_LOCAL_VIEWER:
// 0 means the viewer is at infinity
// 1 means they're in local (eye) space
lighting_params.viewer_at_infinity = (x == 0.f);
break;
case GL_LIGHT_MODEL_TWO_SIDE:
lighting_params.two_sided_lighting = (x != 0.f);
break;
default:
VERIFY_NOT_REACHED();
}
m_rasterizer->set_light_model_params(lighting_params);
}
void GLContext::gl_light_modelv(GLenum pname, void const* params, GLenum type)
{
VERIFY(type == GL_FLOAT || type == GL_INT);
auto parameters_to_vector = [&]<typename T>(T const* params) -> FloatVector4 {
return (pname == GL_LIGHT_MODEL_AMBIENT)
? Vector4<T> { params[0], params[1], params[2], params[3] }.template to_type<float>()
: Vector4<T> { params[0], 0, 0, 0 }.template to_type<float>();
};
auto light_model_parameters = (type == GL_FLOAT)
? parameters_to_vector(reinterpret_cast<GLfloat const*>(params))
: parameters_to_vector(reinterpret_cast<GLint const*>(params));
// Normalize integers to -1..1
if (pname == GL_LIGHT_MODEL_AMBIENT && type == GL_INT)
light_model_parameters = (light_model_parameters + 2147483648.f) / 2147483647.5f - 1.f;
gl_light_model(pname, light_model_parameters[0], light_model_parameters[1], light_model_parameters[2], light_model_parameters[3]);
}
void GLContext::gl_lightf(GLenum light, GLenum pname, GLfloat param)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_lightf, light, pname, param);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(light < GL_LIGHT0 || light >= (GL_LIGHT0 + m_device_info.num_lights), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(pname == GL_CONSTANT_ATTENUATION || pname == GL_LINEAR_ATTENUATION || pname == GL_QUADRATIC_ATTENUATION || pname != GL_SPOT_EXPONENT || pname != GL_SPOT_CUTOFF), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(param < 0.f, GL_INVALID_VALUE);
auto& light_state = m_light_states.at(light - GL_LIGHT0);
switch (pname) {
case GL_CONSTANT_ATTENUATION:
light_state.constant_attenuation = param;
break;
case GL_LINEAR_ATTENUATION:
light_state.linear_attenuation = param;
break;
case GL_QUADRATIC_ATTENUATION:
light_state.quadratic_attenuation = param;
break;
case GL_SPOT_EXPONENT:
RETURN_WITH_ERROR_IF(param > 128.f, GL_INVALID_VALUE);
light_state.spotlight_exponent = param;
break;
case GL_SPOT_CUTOFF:
RETURN_WITH_ERROR_IF(param > 90.f && param != 180.f, GL_INVALID_VALUE);
light_state.spotlight_cutoff_angle = param;
break;
default:
VERIFY_NOT_REACHED();
}
m_light_state_is_dirty = true;
}
void GLContext::gl_lightfv(GLenum light, GLenum pname, GLfloat const* params)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_lightfv, light, pname, params);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(light < GL_LIGHT0 || light >= (GL_LIGHT0 + m_device_info.num_lights), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(pname == GL_AMBIENT || pname == GL_DIFFUSE || pname == GL_SPECULAR || pname == GL_POSITION || pname == GL_CONSTANT_ATTENUATION || pname == GL_LINEAR_ATTENUATION || pname == GL_QUADRATIC_ATTENUATION || pname == GL_SPOT_CUTOFF || pname == GL_SPOT_EXPONENT || pname == GL_SPOT_DIRECTION), GL_INVALID_ENUM);
auto& light_state = m_light_states.at(light - GL_LIGHT0);
switch (pname) {
case GL_AMBIENT:
light_state.ambient_intensity = { params[0], params[1], params[2], params[3] };
break;
case GL_DIFFUSE:
light_state.diffuse_intensity = { params[0], params[1], params[2], params[3] };
break;
case GL_SPECULAR:
light_state.specular_intensity = { params[0], params[1], params[2], params[3] };
break;
case GL_POSITION:
light_state.position = { params[0], params[1], params[2], params[3] };
light_state.position = model_view_matrix() * light_state.position;
break;
case GL_CONSTANT_ATTENUATION:
RETURN_WITH_ERROR_IF(params[0] < 0.f, GL_INVALID_VALUE);
light_state.constant_attenuation = params[0];
break;
case GL_LINEAR_ATTENUATION:
RETURN_WITH_ERROR_IF(params[0] < 0.f, GL_INVALID_VALUE);
light_state.linear_attenuation = params[0];
break;
case GL_QUADRATIC_ATTENUATION:
RETURN_WITH_ERROR_IF(params[0] < 0.f, GL_INVALID_VALUE);
light_state.quadratic_attenuation = params[0];
break;
case GL_SPOT_EXPONENT: {
auto exponent = params[0];
RETURN_WITH_ERROR_IF(exponent < 0.f || exponent > 128.f, GL_INVALID_VALUE);
light_state.spotlight_exponent = exponent;
break;
}
case GL_SPOT_CUTOFF: {
auto cutoff = params[0];
RETURN_WITH_ERROR_IF((cutoff < 0.f || cutoff > 90.f) && cutoff != 180.f, GL_INVALID_VALUE);
light_state.spotlight_cutoff_angle = cutoff;
break;
}
case GL_SPOT_DIRECTION: {
FloatVector4 direction_vector = { params[0], params[1], params[2], 0.f };
direction_vector = model_view_matrix() * direction_vector;
light_state.spotlight_direction = direction_vector.xyz();
break;
}
default:
VERIFY_NOT_REACHED();
}
m_light_state_is_dirty = true;
}
void GLContext::gl_lightiv(GLenum light, GLenum pname, GLint const* params)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_lightiv, light, pname, params);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(light < GL_LIGHT0 || light >= (GL_LIGHT0 + m_device_info.num_lights), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(pname == GL_AMBIENT || pname == GL_DIFFUSE || pname == GL_SPECULAR || pname == GL_POSITION || pname == GL_CONSTANT_ATTENUATION || pname == GL_LINEAR_ATTENUATION || pname == GL_QUADRATIC_ATTENUATION || pname == GL_SPOT_CUTOFF || pname == GL_SPOT_EXPONENT || pname == GL_SPOT_DIRECTION), GL_INVALID_ENUM);
auto& light_state = m_light_states[light - GL_LIGHT0];
auto const to_float_vector = [](GLfloat x, GLfloat y, GLfloat z, GLfloat w) {
return FloatVector4(x, y, z, w);
};
switch (pname) {
case GL_AMBIENT:
light_state.ambient_intensity = to_float_vector(params[0], params[1], params[2], params[3]);
break;
case GL_DIFFUSE:
light_state.diffuse_intensity = to_float_vector(params[0], params[1], params[2], params[3]);
break;
case GL_SPECULAR:
light_state.specular_intensity = to_float_vector(params[0], params[1], params[2], params[3]);
break;
case GL_POSITION:
light_state.position = to_float_vector(params[0], params[1], params[2], params[3]);
light_state.position = model_view_matrix() * light_state.position;
break;
case GL_CONSTANT_ATTENUATION:
RETURN_WITH_ERROR_IF(params[0] < 0, GL_INVALID_VALUE);
light_state.constant_attenuation = static_cast<float>(params[0]);
break;
case GL_LINEAR_ATTENUATION:
RETURN_WITH_ERROR_IF(params[0] < 0, GL_INVALID_VALUE);
light_state.linear_attenuation = static_cast<float>(params[0]);
break;
case GL_QUADRATIC_ATTENUATION:
RETURN_WITH_ERROR_IF(params[0] < 0, GL_INVALID_VALUE);
light_state.quadratic_attenuation = static_cast<float>(params[0]);
break;
case GL_SPOT_EXPONENT: {
auto exponent = static_cast<float>(params[0]);
RETURN_WITH_ERROR_IF(exponent < 0.f || exponent > 128.f, GL_INVALID_VALUE);
light_state.spotlight_exponent = exponent;
break;
}
case GL_SPOT_CUTOFF: {
auto cutoff = static_cast<float>(params[0]);
RETURN_WITH_ERROR_IF((cutoff < 0.f || cutoff > 90.f) && cutoff != 180.f, GL_INVALID_VALUE);
light_state.spotlight_cutoff_angle = cutoff;
break;
}
case GL_SPOT_DIRECTION: {
auto direction_vector = to_float_vector(params[0], params[1], params[2], 0.0f);
direction_vector = model_view_matrix() * direction_vector;
light_state.spotlight_direction = direction_vector.xyz();
break;
}
default:
VERIFY_NOT_REACHED();
}
m_light_state_is_dirty = true;
}
void GLContext::gl_materialf(GLenum face, GLenum pname, GLfloat param)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_materialf, face, pname, param);
RETURN_WITH_ERROR_IF(!(face == GL_FRONT || face == GL_BACK || face == GL_FRONT_AND_BACK), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(pname != GL_SHININESS, GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(param > 128.0f, GL_INVALID_VALUE);
switch (face) {
case GL_FRONT:
m_material_states[Face::Front].shininess = param;
break;
case GL_BACK:
m_material_states[Face::Back].shininess = param;
break;
case GL_FRONT_AND_BACK:
m_material_states[Face::Front].shininess = param;
m_material_states[Face::Back].shininess = param;
break;
default:
VERIFY_NOT_REACHED();
}
m_light_state_is_dirty = true;
}
void GLContext::gl_materialfv(GLenum face, GLenum pname, GLfloat const* params)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_materialfv, face, pname, params);
RETURN_WITH_ERROR_IF(!(face == GL_FRONT || face == GL_BACK || face == GL_FRONT_AND_BACK), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(pname == GL_AMBIENT || pname == GL_DIFFUSE || pname == GL_SPECULAR || pname == GL_EMISSION || pname == GL_SHININESS || pname == GL_AMBIENT_AND_DIFFUSE), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF((pname == GL_SHININESS && *params > 128.0f), GL_INVALID_VALUE);
auto update_material = [](GPU::Material& material, GLenum pname, GLfloat const* params) {
switch (pname) {
case GL_AMBIENT:
material.ambient = { params[0], params[1], params[2], params[3] };
break;
case GL_DIFFUSE:
material.diffuse = { params[0], params[1], params[2], params[3] };
break;
case GL_SPECULAR:
material.specular = { params[0], params[1], params[2], params[3] };
break;
case GL_EMISSION:
material.emissive = { params[0], params[1], params[2], params[3] };
break;
case GL_SHININESS:
material.shininess = params[0];
break;
case GL_AMBIENT_AND_DIFFUSE:
material.ambient = { params[0], params[1], params[2], params[3] };
material.diffuse = { params[0], params[1], params[2], params[3] };
break;
}
};
switch (face) {
case GL_FRONT:
update_material(m_material_states[Face::Front], pname, params);
break;
case GL_BACK:
update_material(m_material_states[Face::Back], pname, params);
break;
case GL_FRONT_AND_BACK:
update_material(m_material_states[Face::Front], pname, params);
update_material(m_material_states[Face::Back], pname, params);
break;
}
m_light_state_is_dirty = true;
}
void GLContext::gl_materialiv(GLenum face, GLenum pname, GLint const* params)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_materialiv, face, pname, params);
RETURN_WITH_ERROR_IF(!(face == GL_FRONT || face == GL_BACK || face == GL_FRONT_AND_BACK), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF(!(pname == GL_AMBIENT || pname == GL_DIFFUSE || pname == GL_SPECULAR || pname == GL_EMISSION || pname == GL_SHININESS || pname == GL_AMBIENT_AND_DIFFUSE), GL_INVALID_ENUM);
RETURN_WITH_ERROR_IF((pname == GL_SHININESS && *params > 128), GL_INVALID_VALUE);
auto update_material = [](GPU::Material& material, GLenum pname, GLint const* params) {
switch (pname) {
case GL_AMBIENT:
material.ambient = { static_cast<float>(params[0]), static_cast<float>(params[1]), static_cast<float>(params[2]), static_cast<float>(params[3]) };
break;
case GL_DIFFUSE:
material.diffuse = { static_cast<float>(params[0]), static_cast<float>(params[1]), static_cast<float>(params[2]), static_cast<float>(params[3]) };
break;
case GL_SPECULAR:
material.specular = { static_cast<float>(params[0]), static_cast<float>(params[1]), static_cast<float>(params[2]), static_cast<float>(params[3]) };
break;
case GL_EMISSION:
material.emissive = { static_cast<float>(params[0]), static_cast<float>(params[1]), static_cast<float>(params[2]), static_cast<float>(params[3]) };
break;
case GL_SHININESS:
material.shininess = static_cast<float>(params[0]);
break;
case GL_AMBIENT_AND_DIFFUSE:
material.ambient = { static_cast<float>(params[0]), static_cast<float>(params[1]), static_cast<float>(params[2]), static_cast<float>(params[3]) };
material.diffuse = { static_cast<float>(params[0]), static_cast<float>(params[1]), static_cast<float>(params[2]), static_cast<float>(params[3]) };
break;
}
};
switch (face) {
case GL_FRONT:
update_material(m_material_states[Face::Front], pname, params);
break;
case GL_BACK:
update_material(m_material_states[Face::Back], pname, params);
break;
case GL_FRONT_AND_BACK:
update_material(m_material_states[Face::Front], pname, params);
update_material(m_material_states[Face::Back], pname, params);
break;
}
m_light_state_is_dirty = true;
}
void GLContext::gl_shade_model(GLenum mode)
{
APPEND_TO_CALL_LIST_AND_RETURN_IF_NEEDED(gl_shade_model, mode);
RETURN_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION);
RETURN_WITH_ERROR_IF(mode != GL_FLAT && mode != GL_SMOOTH, GL_INVALID_ENUM);
auto options = m_rasterizer->options();
options.shade_smooth = (mode == GL_SMOOTH);
m_rasterizer->set_options(options);
}
void GLContext::sync_light_state()
{
if (!m_light_state_is_dirty)
return;
m_light_state_is_dirty = false;
auto options = m_rasterizer->options();
options.color_material_enabled = m_color_material_enabled;
switch (m_color_material_face) {
case GL_BACK:
options.color_material_face = GPU::ColorMaterialFace::Back;
break;
case GL_FRONT:
options.color_material_face = GPU::ColorMaterialFace::Front;
break;
case GL_FRONT_AND_BACK:
options.color_material_face = GPU::ColorMaterialFace::FrontAndBack;
break;
default:
VERIFY_NOT_REACHED();
}
switch (m_color_material_mode) {
case GL_AMBIENT:
options.color_material_mode = GPU::ColorMaterialMode::Ambient;
break;
case GL_AMBIENT_AND_DIFFUSE:
options.color_material_mode = GPU::ColorMaterialMode::AmbientAndDiffuse;
break;
case GL_DIFFUSE:
options.color_material_mode = GPU::ColorMaterialMode::Diffuse;
break;
case GL_EMISSION:
options.color_material_mode = GPU::ColorMaterialMode::Emissive;
break;
case GL_SPECULAR:
options.color_material_mode = GPU::ColorMaterialMode::Specular;
break;
default:
VERIFY_NOT_REACHED();
}
m_rasterizer->set_options(options);
for (auto light_id = 0u; light_id < m_device_info.num_lights; light_id++) {
auto const& current_light_state = m_light_states.at(light_id);
m_rasterizer->set_light_state(light_id, current_light_state);
}
m_rasterizer->set_material_state(GPU::Face::Front, m_material_states[Face::Front]);
m_rasterizer->set_material_state(GPU::Face::Back, m_material_states[Face::Back]);
}
}
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