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220ac5eb02
The previous clipping implementation was problematic especially when clipping against the near plane. Triangles are now correctly clipped using homogenous coordinates against all frustum planes. Texture coordinates and vertex colors are now correctly interpolated. The earier implementation was just a placeholder.
58 lines
1.4 KiB
C++
58 lines
1.4 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Vector.h>
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#include <LibGL/GLStruct.h>
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#include <LibGfx/Vector4.h>
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namespace GL {
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class Clipper final {
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enum ClipPlane : u8 {
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LEFT = 0,
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RIGHT,
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TOP,
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BOTTOM,
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NEAR,
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FAR
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};
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static constexpr u8 NUMBER_OF_CLIPPING_PLANES = 6;
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static constexpr u8 MAX_CLIPPED_VERTS = 6;
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static constexpr FloatVector4 clip_planes[] = {
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{ -1, 0, 0, 1 }, // Left Plane
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{ 1, 0, 0, 1 }, // Right Plane
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{ 0, 1, 0, 1 }, // Top Plane
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{ 0, -1, 0, 1 }, // Bottom plane
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{ 0, 0, 1, 1 }, // Near Plane
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{ 0, 0, -1, 1 } // Far Plane
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};
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static constexpr FloatVector4 clip_plane_normals[] = {
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{ 1, 0, 0, 0 }, // Left Plane
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{ -1, 0, 0, 0 }, // Right Plane
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{ 0, -1, 0, 0 }, // Top Plane
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{ 0, 1, 0, 0 }, // Bottom plane
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{ 0, 0, 1, 0 }, // Near Plane
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{ 0, 0, -1, 0 } // Far Plane
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};
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public:
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Clipper() { }
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void clip_triangle_against_frustum(Vector<GLVertex>& input_vecs);
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private:
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bool point_within_clip_plane(const FloatVector4& vertex, ClipPlane plane);
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GLVertex clip_intersection_point(const GLVertex& vec, const GLVertex& prev_vec, ClipPlane plane_index);
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Vector<GLVertex> list_a;
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Vector<GLVertex> list_b;
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};
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}
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