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LibGL+LibSoftGPU+3DFileViewer: Implement Specular highlighting :^)

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Jesse Buhagiar 2022-01-15 16:16:01 +11:00 • committed by Idan Horowitz
parent 5bb8c14c8f
commit 865e7bbe5e
4 changed files with 35 additions and 4 deletions
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22
Userland/Libraries/LibSoftGPU/Device.cpp
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@ -856,9 +856,6 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
spotlight_factor = 0.0f;
}
// FIXME: Specular. The math for it doesn't quite make sense...
(void)m_lighting_model.viewer_at_infinity;
// FIXME: The spec allows for splitting the colors calculated here into multiple different colors (primary/secondary color). Investigate what this means.
(void)m_lighting_model.single_color;
@ -870,10 +867,27 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
// Diffuse
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);
// Specular
FloatVector4 specular_component = { 0.0f, 0.0f, 0.0f, 0.0f };
if (normal_dot_vertex_to_light > 0.0f) {
FloatVector3 half_vector_normalized;
if (!m_lighting_model.viewer_at_infinity) {
half_vector_normalized = (vertex_to_light + FloatVector3(0.0f, 0.0f, 1.0f)).normalized();
} else {
auto const vertex_to_eye_point = sgi_arrow_operator(vertex.eye_coordinates.normalized(), FloatVector4(0.0f, 0.0f, 0.0f, 1.0f), vector_length);
half_vector_normalized = vertex_to_light + vertex_to_eye_point;
}
auto const normal_dot_half_vector = sgi_dot_operator(vertex.normal.normalized(), half_vector_normalized);
auto const specular_coefficient = AK::pow(normal_dot_half_vector, material.shininess);
specular_component = (specular * light.specular_intensity) * specular_coefficient;
}
FloatVector4 color = ambient_component;
color += diffuse_component;
color += specular_component;
color = color * light_attenuation_factor * spotlight_factor;
result_color += color;
}