diff --git a/src/video_core/regs_lighting.h b/src/video_core/regs_lighting.h
index f383b8b4f1..7221d16886 100644
--- a/src/video_core/regs_lighting.h
+++ b/src/video_core/regs_lighting.h
@@ -168,6 +168,8 @@ struct LightingRegs {
union {
BitField<0, 1, u32> directional;
BitField<1, 1, u32> two_sided_diffuse; // When disabled, clamp dot-product to 0
+ BitField<2, 1, u32> geometric_factor_0;
+ BitField<3, 1, u32> geometric_factor_1;
} config;
BitField<0, 20, u32> dist_atten_bias;
diff --git a/src/video_core/renderer_opengl/gl_shader_gen.cpp b/src/video_core/renderer_opengl/gl_shader_gen.cpp
index 14be1201f8..540cbb9d0a 100644
--- a/src/video_core/renderer_opengl/gl_shader_gen.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_gen.cpp
@@ -73,6 +73,8 @@ PicaShaderConfig PicaShaderConfig::BuildFromRegs(const Pica::Regs& regs) {
state.lighting.light[light_index].num = num;
state.lighting.light[light_index].directional = light.config.directional != 0;
state.lighting.light[light_index].two_sided_diffuse = light.config.two_sided_diffuse != 0;
+ state.lighting.light[light_index].geometric_factor_0 = light.config.geometric_factor_0 != 0;
+ state.lighting.light[light_index].geometric_factor_1 = light.config.geometric_factor_1 != 0;
state.lighting.light[light_index].dist_atten_enable =
!regs.lighting.IsDistAttenDisabled(num);
state.lighting.light[light_index].spot_atten_enable =
@@ -518,7 +520,9 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
"vec4 specular_sum = vec4(0.0, 0.0, 0.0, 1.0);\n"
"vec3 light_vector = vec3(0.0);\n"
"vec3 refl_value = vec3(0.0);\n"
- "vec3 spot_dir = vec3(0.0);\n;";
+ "vec3 spot_dir = vec3(0.0);\n"
+ "vec3 half_vector = vec3(0.0);\n"
+ "float geo_factor = 1.0;\n";
// Compute fragment normals and tangents
const std::string pertubation =
@@ -561,15 +565,14 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
// Gets the index into the specified lookup table for specular lighting
auto GetLutIndex = [&lighting](unsigned light_num, LightingRegs::LightingLutInput input,
bool abs) {
- const std::string half_angle = "normalize(normalize(view) + light_vector)";
std::string index;
switch (input) {
case LightingRegs::LightingLutInput::NH:
- index = "dot(normal, " + half_angle + ")";
+ index = "dot(normal, normalize(half_vector))";
break;
case LightingRegs::LightingLutInput::VH:
- index = std::string("dot(normalize(view), " + half_angle + ")");
+ index = std::string("dot(normalize(view), normalize(half_vector))");
break;
case LightingRegs::LightingLutInput::NV:
@@ -590,9 +593,8 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
// Note: even if the normal vector is modified by normal map, which is not the
// normal of the tangent plane anymore, the half angle vector is still projected
// using the modified normal vector.
- std::string half_angle_proj = half_angle +
- " - normal / dot(normal, normal) * dot(normal, " +
- half_angle + ")";
+ std::string half_angle_proj = "normalize(half_vector) - normal / dot(normal, "
+ "normal) * dot(normal, normalize(half_vector))";
// Note: the half angle vector projection is confirmed not normalized before the dot
// product. The result is in fact not cos(phi) as the name suggested.
index = "dot(" + half_angle_proj + ", tangent)";
@@ -638,6 +640,7 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
out += "light_vector = normalize(" + light_src + ".position + view);\n";
out += "spot_dir = " + light_src + ".spot_direction;\n";
+ out += "half_vector = normalize(view) + light_vector;\n";
// Compute dot product of light_vector and normal, adjust if lighting is one-sided or
// two-sided
@@ -671,6 +674,12 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
std::string clamp_highlights =
lighting.clamp_highlights ? "(dot(light_vector, normal) <= 0.0 ? 0.0 : 1.0)" : "1.0";
+ if (light_config.geometric_factor_0 || light_config.geometric_factor_1) {
+ out += "geo_factor = dot(half_vector, half_vector);\n"
+ "geo_factor = geo_factor == 0.0 ? 0.0 : min(" +
+ dot_product + " / geo_factor, 1.0);\n";
+ }
+
// Specular 0 component
std::string d0_lut_value = "1.0";
if (lighting.lut_d0.enable &&
@@ -683,6 +692,9 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
GetLutValue(LightingRegs::LightingSampler::Distribution0, index) + ")";
}
std::string specular_0 = "(" + d0_lut_value + " * " + light_src + ".specular_0)";
+ if (light_config.geometric_factor_0) {
+ specular_0 = "(" + specular_0 + " * geo_factor)";
+ }
// If enabled, lookup ReflectRed value, otherwise, 1.0 is used
if (lighting.lut_rr.enable &&
@@ -738,6 +750,9 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
}
std::string specular_1 =
"(" + d1_lut_value + " * refl_value * " + light_src + ".specular_1)";
+ if (light_config.geometric_factor_1) {
+ specular_1 = "(" + specular_1 + " * geo_factor)";
+ }
// Fresnel
if (lighting.lut_fr.enable &&
diff --git a/src/video_core/renderer_opengl/gl_shader_gen.h b/src/video_core/renderer_opengl/gl_shader_gen.h
index 9c90eadf9e..2302ae4533 100644
--- a/src/video_core/renderer_opengl/gl_shader_gen.h
+++ b/src/video_core/renderer_opengl/gl_shader_gen.h
@@ -94,6 +94,8 @@ union PicaShaderConfig {
bool two_sided_diffuse;
bool dist_atten_enable;
bool spot_atten_enable;
+ bool geometric_factor_0;
+ bool geometric_factor_1;
} light[8];
bool enable;