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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
View file

@ -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:

1
Userland/Libraries/LibGL/SoftwareGLContext.h
View file

@ -206,6 +206,7 @@ private:
GLclampf m_alpha_test_ref_value = 0;
bool m_dither_enabled { true };
bool m_normalize { false };
// Stencil configuration
bool m_stencil_test_enabled { false };

14
Userland/Libraries/LibSoftGPU/Device.cpp
View file

@ -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);

4
Userland/Libraries/LibSoftGPU/Device.h
View file

@ -10,6 +10,7 @@
#include <AK/NonnullRefPtr.h>
#include <AK/OwnPtr.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/Matrix3x3.h>
#include <LibGfx/Matrix4x4.h>
#include <LibGfx/Rect.h>
#include <LibGfx/Vector4.h>
@ -47,6 +48,7 @@ struct RasterizerOptions {
float fog_start { 0.0f };
float fog_end { 1.0f };
bool scissor_enabled { false };
bool normalization_enabled { false };
Gfx::IntRect scissor_box;
bool enable_color_write { true };
float depth_offset_factor { 0 };
@ -65,7 +67,7 @@ public:
DeviceInfo info() const;
void draw_primitives(PrimitiveType, FloatMatrix4x4 const& transform, FloatMatrix4x4 const& texture_matrix, Vector<Vertex> const& vertices, Vector<size_t> const& enabled_texture_units);
void draw_primitives(PrimitiveType, FloatMatrix4x4 const& transform, FloatMatrix3x3 const& normal_transform, FloatMatrix4x4 const& texture_transform, Vector<Vertex> const& vertices, Vector<size_t> const& enabled_texture_units);
void resize(const Gfx::IntSize& min_size);
void clear_color(const FloatVector4&);
void clear_depth(float);