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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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23
Userland/Libraries/LibGL/SoftwareGLContext.cpp
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@ -280,7 +280,16 @@ void SoftwareGLContext::gl_end()
VERIFY_NOT_REACHED();
}
m_rasterizer.draw_primitives(primitive_type, m_projection_matrix * m_model_view_matrix, m_texture_matrix, m_vertex_list, enabled_texture_units);
// Set up normals transform by taking the upper left 3x3 elements from the model view matrix
// See section 2.11.3 of the OpenGL 1.5 spec
auto const& mv_elements = m_model_view_matrix.elements();
auto normal_transform = FloatMatrix3x3(
mv_elements[0][0], mv_elements[0][1], mv_elements[0][2],
mv_elements[1][0], mv_elements[1][1], mv_elements[1][2],
mv_elements[2][0], mv_elements[2][1], mv_elements[2][2]);
normal_transform = normal_transform.inverse();
m_rasterizer.draw_primitives(primitive_type, m_projection_matrix * m_model_view_matrix, normal_transform, m_texture_matrix, m_vertex_list, enabled_texture_units);
m_vertex_list.clear_with_capacity();
}
@ -619,6 +628,11 @@ void SoftwareGLContext::gl_enable(GLenum capability)
case GL_LIGHTING:
m_lighting_enabled = true;
break;
case GL_NORMALIZE:
m_normalize = true;
rasterizer_options.normalization_enabled = true;
update_rasterizer_options = true;
break;
case GL_SCISSOR_TEST:
rasterizer_options.scissor_enabled = true;
update_rasterizer_options = true;
@ -690,6 +704,11 @@ void SoftwareGLContext::gl_disable(GLenum capability)
case GL_LIGHTING:
m_lighting_enabled = false;
break;
case GL_NORMALIZE:
m_normalize = false;
rasterizer_options.normalization_enabled = false;
update_rasterizer_options = true;
break;
case GL_SCISSOR_TEST:
rasterizer_options.scissor_enabled = false;
update_rasterizer_options = true;
@ -742,6 +761,8 @@ GLboolean SoftwareGLContext::gl_is_enabled(GLenum capability)
return rasterizer_options.fog_enabled;
case GL_LIGHTING:
return m_lighting_enabled;
case GL_NORMALIZE:
return m_normalize;
case GL_SCISSOR_TEST:
return rasterizer_options.scissor_enabled;
case GL_STENCIL_TEST: