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LibGL+LibSoftGPU: Implement normalization of normals

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* LibGL now supports the `GL_NORMALIZE` capability
* LibSoftGPU transforms and normalizes the vertices' normals

Normals are heavily used in texture coordinate generation, to be
implemented in a future commit.
This commit is contained in:
Jelle Raaijmakers 2021-12-30 00:27:17 +01:00 • committed by Andreas Kling
parent e056cf7e3f
commit 3a5f69b6f3
4 changed files with 38 additions and 4 deletions
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14
Userland/Libraries/LibSoftGPU/Device.cpp
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@ -524,7 +524,8 @@ DeviceInfo Device::info() const
};
}
void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const& transform, FloatMatrix4x4 const& texture_matrix, Vector<Vertex> const& vertices, Vector<size_t> const& enabled_texture_units)
void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const& transform, FloatMatrix3x3 const& normal_transform,
FloatMatrix4x4 const& texture_transform, Vector<Vertex> const& vertices, Vector<size_t> const& enabled_texture_units)
{
// At this point, the user has effectively specified that they are done with defining the geometry
// of what they want to draw. We now need to do a few things (https://www.khronos.org/opengl/wiki/Rendering_Pipeline_Overview):
@ -675,8 +676,17 @@ void Device::draw_primitives(PrimitiveType primitive_type, FloatMatrix4x4 const&
continue;
}
if (area > 0) {
if (area > 0)
swap(triangle.vertices[0], triangle.vertices[1]);
// Transform normals
triangle.vertices[0].normal = normal_transform * triangle.vertices[0].normal;
triangle.vertices[1].normal = normal_transform * triangle.vertices[1].normal;
triangle.vertices[2].normal = normal_transform * triangle.vertices[2].normal;
if (m_options.normalization_enabled) {
triangle.vertices[0].normal.normalize();
triangle.vertices[1].normal.normalize();
triangle.vertices[2].normal.normalize();
}
submit_triangle(triangle, enabled_texture_units);