278 lines
12 KiB
C++
278 lines
12 KiB
C++
// Copyright 2017 Citra Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include "common/math_util.h"
|
|
#include "video_core/swrasterizer/lighting.h"
|
|
|
|
namespace Pica {
|
|
|
|
static float LookupLightingLut(const Pica::State::Lighting& lighting, size_t lut_index, u8 index,
|
|
float delta) {
|
|
ASSERT_MSG(lut_index < lighting.luts.size(), "Out of range lut");
|
|
ASSERT_MSG(index < lighting.luts[lut_index].size(), "Out of range index");
|
|
|
|
const auto& lut = lighting.luts[lut_index][index];
|
|
|
|
float lut_value = lut.ToFloat();
|
|
float lut_diff = lut.DiffToFloat();
|
|
|
|
return lut_value + lut_diff * delta;
|
|
}
|
|
|
|
std::tuple<Math::Vec4<u8>, Math::Vec4<u8>> ComputeFragmentsColors(
|
|
const Pica::LightingRegs& lighting, const Pica::State::Lighting& lighting_state,
|
|
const Math::Quaternion<float>& normquat, const Math::Vec3<float>& view) {
|
|
|
|
// TODO(Subv): Bump mapping
|
|
Math::Vec3<float> surface_normal = {0.0f, 0.0f, 1.0f};
|
|
|
|
if (lighting.config0.bump_mode != LightingRegs::LightingBumpMode::None) {
|
|
LOG_CRITICAL(HW_GPU, "unimplemented bump mapping");
|
|
UNIMPLEMENTED();
|
|
}
|
|
|
|
// Use the normalized the quaternion when performing the rotation
|
|
auto normal = Math::QuaternionRotate(normquat, surface_normal);
|
|
|
|
Math::Vec4<float> diffuse_sum = {0.0f, 0.0f, 0.0f, 1.0f};
|
|
Math::Vec4<float> specular_sum = {0.0f, 0.0f, 0.0f, 1.0f};
|
|
|
|
for (unsigned light_index = 0; light_index <= lighting.max_light_index; ++light_index) {
|
|
unsigned num = lighting.light_enable.GetNum(light_index);
|
|
const auto& light_config = lighting.light[num];
|
|
|
|
Math::Vec3<float> refl_value = {};
|
|
Math::Vec3<float> position = {float16::FromRaw(light_config.x).ToFloat32(),
|
|
float16::FromRaw(light_config.y).ToFloat32(),
|
|
float16::FromRaw(light_config.z).ToFloat32()};
|
|
Math::Vec3<float> light_vector;
|
|
|
|
if (light_config.config.directional)
|
|
light_vector = position;
|
|
else
|
|
light_vector = position + view;
|
|
|
|
light_vector.Normalize();
|
|
|
|
Math::Vec3<float> norm_view = view.Normalized();
|
|
Math::Vec3<float> half_vector = norm_view + light_vector;
|
|
|
|
float dist_atten = 1.0f;
|
|
if (!lighting.IsDistAttenDisabled(num)) {
|
|
auto distance = (-view - position).Length();
|
|
float scale = Pica::float20::FromRaw(light_config.dist_atten_scale).ToFloat32();
|
|
float bias = Pica::float20::FromRaw(light_config.dist_atten_bias).ToFloat32();
|
|
size_t lut =
|
|
static_cast<size_t>(LightingRegs::LightingSampler::DistanceAttenuation) + num;
|
|
|
|
float sample_loc = MathUtil::Clamp(scale * distance + bias, 0.0f, 1.0f);
|
|
|
|
u8 lutindex =
|
|
static_cast<u8>(MathUtil::Clamp(std::floor(sample_loc * 256.0f), 0.0f, 255.0f));
|
|
float delta = sample_loc * 256 - lutindex;
|
|
dist_atten = LookupLightingLut(lighting_state, lut, lutindex, delta);
|
|
}
|
|
|
|
auto GetLutValue = [&](LightingRegs::LightingLutInput input, bool abs,
|
|
LightingRegs::LightingScale scale_enum,
|
|
LightingRegs::LightingSampler sampler) {
|
|
float result = 0.0f;
|
|
|
|
switch (input) {
|
|
case LightingRegs::LightingLutInput::NH:
|
|
result = Math::Dot(normal, half_vector.Normalized());
|
|
break;
|
|
|
|
case LightingRegs::LightingLutInput::VH:
|
|
result = Math::Dot(norm_view, half_vector.Normalized());
|
|
break;
|
|
|
|
case LightingRegs::LightingLutInput::NV:
|
|
result = Math::Dot(normal, norm_view);
|
|
break;
|
|
|
|
case LightingRegs::LightingLutInput::LN:
|
|
result = Math::Dot(light_vector, normal);
|
|
break;
|
|
|
|
case LightingRegs::LightingLutInput::SP: {
|
|
Math::Vec3<s32> spot_dir{light_config.spot_x.Value(), light_config.spot_y.Value(),
|
|
light_config.spot_z.Value()};
|
|
result = Math::Dot(light_vector, spot_dir.Cast<float>() / 2047.0f);
|
|
break;
|
|
}
|
|
default:
|
|
LOG_CRITICAL(HW_GPU, "Unknown lighting LUT input %u\n", static_cast<u32>(input));
|
|
UNIMPLEMENTED();
|
|
result = 0.0f;
|
|
}
|
|
|
|
u8 index;
|
|
float delta;
|
|
|
|
if (abs) {
|
|
if (light_config.config.two_sided_diffuse)
|
|
result = std::abs(result);
|
|
else
|
|
result = std::max(result, 0.0f);
|
|
|
|
float flr = std::floor(result * 256.0f);
|
|
index = static_cast<u8>(MathUtil::Clamp(flr, 0.0f, 255.0f));
|
|
delta = result * 256 - index;
|
|
} else {
|
|
float flr = std::floor(result * 128.0f);
|
|
s8 signed_index = static_cast<s8>(MathUtil::Clamp(flr, -128.0f, 127.0f));
|
|
delta = result * 128.0f - signed_index;
|
|
index = static_cast<u8>(signed_index);
|
|
}
|
|
|
|
float scale = lighting.lut_scale.GetScale(scale_enum);
|
|
return scale *
|
|
LookupLightingLut(lighting_state, static_cast<size_t>(sampler), index, delta);
|
|
};
|
|
|
|
// If enabled, compute spot light attenuation value
|
|
float spot_atten = 1.0f;
|
|
if (!lighting.IsSpotAttenDisabled(num) &&
|
|
LightingRegs::IsLightingSamplerSupported(
|
|
lighting.config0.config, LightingRegs::LightingSampler::SpotlightAttenuation)) {
|
|
auto lut = LightingRegs::SpotlightAttenuationSampler(num);
|
|
spot_atten = GetLutValue(lighting.lut_input.sp, lighting.abs_lut_input.disable_sp == 0,
|
|
lighting.lut_scale.sp, lut);
|
|
}
|
|
|
|
// Specular 0 component
|
|
float d0_lut_value = 1.0f;
|
|
if (lighting.config1.disable_lut_d0 == 0 &&
|
|
LightingRegs::IsLightingSamplerSupported(
|
|
lighting.config0.config, LightingRegs::LightingSampler::Distribution0)) {
|
|
d0_lut_value =
|
|
GetLutValue(lighting.lut_input.d0, lighting.abs_lut_input.disable_d0 == 0,
|
|
lighting.lut_scale.d0, LightingRegs::LightingSampler::Distribution0);
|
|
}
|
|
|
|
Math::Vec3<float> specular_0 = d0_lut_value * light_config.specular_0.ToVec3f();
|
|
|
|
// If enabled, lookup ReflectRed value, otherwise, 1.0 is used
|
|
if (lighting.config1.disable_lut_rr == 0 &&
|
|
LightingRegs::IsLightingSamplerSupported(lighting.config0.config,
|
|
LightingRegs::LightingSampler::ReflectRed)) {
|
|
refl_value.x =
|
|
GetLutValue(lighting.lut_input.rr, lighting.abs_lut_input.disable_rr == 0,
|
|
lighting.lut_scale.rr, LightingRegs::LightingSampler::ReflectRed);
|
|
} else {
|
|
refl_value.x = 1.0f;
|
|
}
|
|
|
|
// If enabled, lookup ReflectGreen value, otherwise, ReflectRed value is used
|
|
if (lighting.config1.disable_lut_rg == 0 &&
|
|
LightingRegs::IsLightingSamplerSupported(lighting.config0.config,
|
|
LightingRegs::LightingSampler::ReflectGreen)) {
|
|
refl_value.y =
|
|
GetLutValue(lighting.lut_input.rg, lighting.abs_lut_input.disable_rg == 0,
|
|
lighting.lut_scale.rg, LightingRegs::LightingSampler::ReflectGreen);
|
|
} else {
|
|
refl_value.y = refl_value.x;
|
|
}
|
|
|
|
// If enabled, lookup ReflectBlue value, otherwise, ReflectRed value is used
|
|
if (lighting.config1.disable_lut_rb == 0 &&
|
|
LightingRegs::IsLightingSamplerSupported(lighting.config0.config,
|
|
LightingRegs::LightingSampler::ReflectBlue)) {
|
|
refl_value.z =
|
|
GetLutValue(lighting.lut_input.rb, lighting.abs_lut_input.disable_rb == 0,
|
|
lighting.lut_scale.rb, LightingRegs::LightingSampler::ReflectBlue);
|
|
} else {
|
|
refl_value.z = refl_value.x;
|
|
}
|
|
|
|
// Specular 1 component
|
|
float d1_lut_value = 1.0f;
|
|
if (lighting.config1.disable_lut_d1 == 0 &&
|
|
LightingRegs::IsLightingSamplerSupported(
|
|
lighting.config0.config, LightingRegs::LightingSampler::Distribution1)) {
|
|
d1_lut_value =
|
|
GetLutValue(lighting.lut_input.d1, lighting.abs_lut_input.disable_d1 == 0,
|
|
lighting.lut_scale.d1, LightingRegs::LightingSampler::Distribution1);
|
|
}
|
|
|
|
Math::Vec3<float> specular_1 =
|
|
d1_lut_value * refl_value * light_config.specular_1.ToVec3f();
|
|
|
|
// Fresnel
|
|
if (lighting.config1.disable_lut_fr == 0 &&
|
|
LightingRegs::IsLightingSamplerSupported(lighting.config0.config,
|
|
LightingRegs::LightingSampler::Fresnel)) {
|
|
|
|
float lut_value =
|
|
GetLutValue(lighting.lut_input.fr, lighting.abs_lut_input.disable_fr == 0,
|
|
lighting.lut_scale.fr, LightingRegs::LightingSampler::Fresnel);
|
|
|
|
// Enabled for diffuse lighting alpha component
|
|
if (lighting.config0.fresnel_selector ==
|
|
LightingRegs::LightingFresnelSelector::PrimaryAlpha ||
|
|
lighting.config0.fresnel_selector == LightingRegs::LightingFresnelSelector::Both) {
|
|
diffuse_sum.a() *= lut_value;
|
|
}
|
|
|
|
// Enabled for the specular lighting alpha component
|
|
if (lighting.config0.fresnel_selector ==
|
|
LightingRegs::LightingFresnelSelector::SecondaryAlpha ||
|
|
lighting.config0.fresnel_selector == LightingRegs::LightingFresnelSelector::Both) {
|
|
specular_sum.a() *= lut_value;
|
|
}
|
|
}
|
|
|
|
auto dot_product = Math::Dot(light_vector, normal);
|
|
|
|
// Calculate clamp highlights before applying the two-sided diffuse configuration to the dot
|
|
// product.
|
|
float clamp_highlights = 1.0f;
|
|
if (lighting.config0.clamp_highlights) {
|
|
if (dot_product <= 0.0f)
|
|
clamp_highlights = 0.0f;
|
|
else
|
|
clamp_highlights = 1.0f;
|
|
}
|
|
|
|
if (light_config.config.two_sided_diffuse)
|
|
dot_product = std::abs(dot_product);
|
|
else
|
|
dot_product = std::max(dot_product, 0.0f);
|
|
|
|
if (light_config.config.geometric_factor_0 || light_config.config.geometric_factor_1) {
|
|
float geo_factor = half_vector.Length2();
|
|
geo_factor = geo_factor == 0.0f ? 0.0f : std::min(dot_product / geo_factor, 1.0f);
|
|
if (light_config.config.geometric_factor_0) {
|
|
specular_0 *= geo_factor;
|
|
}
|
|
if (light_config.config.geometric_factor_1) {
|
|
specular_1 *= geo_factor;
|
|
}
|
|
}
|
|
|
|
auto diffuse =
|
|
light_config.diffuse.ToVec3f() * dot_product + light_config.ambient.ToVec3f();
|
|
diffuse_sum += Math::MakeVec(diffuse * dist_atten * spot_atten, 0.0f);
|
|
|
|
specular_sum += Math::MakeVec(
|
|
(specular_0 + specular_1) * clamp_highlights * dist_atten * spot_atten, 0.0f);
|
|
}
|
|
|
|
diffuse_sum += Math::MakeVec(lighting.global_ambient.ToVec3f(), 0.0f);
|
|
|
|
auto diffuse = Math::MakeVec<float>(MathUtil::Clamp(diffuse_sum.x, 0.0f, 1.0f) * 255,
|
|
MathUtil::Clamp(diffuse_sum.y, 0.0f, 1.0f) * 255,
|
|
MathUtil::Clamp(diffuse_sum.z, 0.0f, 1.0f) * 255,
|
|
MathUtil::Clamp(diffuse_sum.w, 0.0f, 1.0f) * 255)
|
|
.Cast<u8>();
|
|
auto specular = Math::MakeVec<float>(MathUtil::Clamp(specular_sum.x, 0.0f, 1.0f) * 255,
|
|
MathUtil::Clamp(specular_sum.y, 0.0f, 1.0f) * 255,
|
|
MathUtil::Clamp(specular_sum.z, 0.0f, 1.0f) * 255,
|
|
MathUtil::Clamp(specular_sum.w, 0.0f, 1.0f) * 255)
|
|
.Cast<u8>();
|
|
return std::make_tuple(diffuse, specular);
|
|
}
|
|
|
|
} // namespace Pica
|