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LibSoftGPU: Add sgi_dot lambda

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This function is used quite a bit during the lighting calculations, so
it's a bit cleaner having it in a centralized spot instead of just
arbitrarily calling `dot()` with numerous `FloatVector3` conversions.
This commit is contained in:
Jesse Buhagiar 2022-01-16 02:16:27 +11:00 • committed by Idan Horowitz
parent fc8dd0bf68
commit 5a735602b0
1 changed files with 9 additions and 6 deletions
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15
Userland/Libraries/LibSoftGPU/Device.cpp
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@ -828,6 +828,10 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
} }
}; };
auto sgi_dot_operator = [](FloatVector3 const& d1, FloatVector3 const& d2) {
return AK::max(d1.dot(d2), 0.0f);
};
float vector_length = 0.0f; float vector_length = 0.0f;
FloatVector3 vertex_to_light = sgi_arrow_operator(vertex.eye_coordinates, light.position, vector_length); FloatVector3 vertex_to_light = sgi_arrow_operator(vertex.eye_coordinates, light.position, vector_length);
@ -843,12 +847,11 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
// Spotlight factor // Spotlight factor
float spotlight_factor = 1.0f; float spotlight_factor = 1.0f;
if (light.spotlight_cutoff_angle != 180.0f) { if (light.spotlight_cutoff_angle != 180.0f) {
const auto spotlight_direction_normalized = light.spotlight_direction.normalized(); auto const vertex_to_light_dot_spotlight_direction = sgi_dot_operator(vertex_to_light, light.spotlight_direction.normalized());
const auto light_to_vertex_dot_normalized_spotlight_direction = spotlight_direction_normalized.dot(FloatVector3(vertex_to_light.x(), vertex_to_light.y(), vertex_to_light.z())); auto const cos_spotlight_cutoff = AK::cos<float>(light.spotlight_cutoff_angle * AK::Pi<float> / 180.f);
const auto cos_spotlight_cutoff = AK::cos<float>(light.spotlight_cutoff_angle * AK::Pi<float> / 180.f);
if (light_to_vertex_dot_normalized_spotlight_direction >= cos_spotlight_cutoff) if (vertex_to_light_dot_spotlight_direction >= cos_spotlight_cutoff)
spotlight_factor = AK::pow<float>(light_to_vertex_dot_normalized_spotlight_direction, light.spotlight_exponent); spotlight_factor = AK::pow<float>(vertex_to_light_dot_spotlight_direction, light.spotlight_exponent);
else else
spotlight_factor = 0.0f; spotlight_factor = 0.0f;
} }
@ -866,7 +869,7 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
auto const ambient_component = ambient * light.ambient_intensity; auto const ambient_component = ambient * light.ambient_intensity;
// Diffuse // Diffuse
auto const normal_dot_vertex_to_light = vertex.normal.dot(FloatVector3(vertex_to_light.x(), vertex_to_light.y(), vertex_to_light.z())); auto const normal_dot_vertex_to_light = sgi_dot_operator(vertex.normal, vertex_to_light);
auto const diffuse_component = ((diffuse * light.diffuse_intensity) * normal_dot_vertex_to_light).clamped(0.0f, 1.0f); auto const diffuse_component = ((diffuse * light.diffuse_intensity) * normal_dot_vertex_to_light).clamped(0.0f, 1.0f);
FloatVector4 color = ambient_component; FloatVector4 color = ambient_component;