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115 lines
3.7 KiB
C++
115 lines
3.7 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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* Copyright (c) 2021, Mathieu Gaillard <gaillard.mathieu.39@gmail.com>
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* Copyright (c) 2021, Pedro Pereira <pmh.pereira@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGL/GL/gl.h>
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#include <LibGfx/Color.h>
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#include <LibGfx/Vector3.h>
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#include <LibGfx/Vector4.h>
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#include "Mesh.h"
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const Color colors[] {
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Color::Red,
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Color::Green,
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Color::Blue,
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Color::Magenta,
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Color::Yellow,
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Color::Cyan,
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Color::White
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};
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Mesh::Mesh(Vector<Vertex> vertices, Vector<TexCoord> tex_coords, Vector<Vertex> normals, Vector<Triangle> triangles)
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: m_vertex_list(move(vertices))
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, m_tex_coords(move(tex_coords))
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, m_normal_list(move(normals))
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, m_triangle_list(move(triangles))
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{
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}
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void Mesh::draw(float uv_scale)
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{
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for (u32 i = 0; i < m_triangle_list.size(); i++) {
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auto const& triangle = m_triangle_list[i];
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const FloatVector3 vertex_a(
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m_vertex_list.at(triangle.a).x,
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m_vertex_list.at(triangle.a).y,
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m_vertex_list.at(triangle.a).z);
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const FloatVector3 vertex_b(
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m_vertex_list.at(triangle.b).x,
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m_vertex_list.at(triangle.b).y,
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m_vertex_list.at(triangle.b).z);
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const FloatVector3 vertex_c(
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m_vertex_list.at(triangle.c).x,
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m_vertex_list.at(triangle.c).y,
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m_vertex_list.at(triangle.c).z);
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FloatVector3 normal_a, normal_b, normal_c;
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if (has_normals()) {
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normal_a = FloatVector3(
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m_normal_list.at(triangle.normal_index0).x,
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m_normal_list.at(triangle.normal_index0).y,
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m_normal_list.at(triangle.normal_index0).z);
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normal_b = FloatVector3(
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m_normal_list.at(triangle.normal_index1).x,
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m_normal_list.at(triangle.normal_index1).y,
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m_normal_list.at(triangle.normal_index1).z);
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normal_c = FloatVector3(
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m_normal_list.at(triangle.normal_index2).x,
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m_normal_list.at(triangle.normal_index2).y,
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m_normal_list.at(triangle.normal_index2).z);
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} else {
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// Compute the triangle normal
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const FloatVector3 vec_ab = vertex_b - vertex_a;
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const FloatVector3 vec_ac = vertex_c - vertex_a;
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normal_a = vec_ab.cross(vec_ac).normalized();
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normal_b = normal_a;
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normal_c = normal_a;
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}
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glBegin(GL_TRIANGLES);
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if (is_textured())
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glTexCoord2f(m_tex_coords.at(triangle.tex_coord_index0).u * uv_scale, (1.0f - m_tex_coords.at(triangle.tex_coord_index0).v) * uv_scale);
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// Vertex 1
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glNormal3f(normal_a.x(), normal_a.y(), normal_a.z());
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glVertex3f(
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m_vertex_list.at(triangle.a).x,
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m_vertex_list.at(triangle.a).y,
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m_vertex_list.at(triangle.a).z);
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if (is_textured())
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glTexCoord2f(m_tex_coords.at(triangle.tex_coord_index1).u * uv_scale, (1.0f - m_tex_coords.at(triangle.tex_coord_index1).v) * uv_scale);
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// Vertex 2
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glNormal3f(normal_b.x(), normal_b.y(), normal_b.z());
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glVertex3f(
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m_vertex_list.at(triangle.b).x,
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m_vertex_list.at(triangle.b).y,
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m_vertex_list.at(triangle.b).z);
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if (is_textured())
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glTexCoord2f(m_tex_coords.at(triangle.tex_coord_index2).u * uv_scale, (1.0f - m_tex_coords.at(triangle.tex_coord_index2).v) * uv_scale);
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// Vertex 3
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glNormal3f(normal_c.x(), normal_c.y(), normal_c.z());
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glVertex3f(
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m_vertex_list.at(triangle.c).x,
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m_vertex_list.at(triangle.c).y,
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m_vertex_list.at(triangle.c).z);
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glEnd();
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}
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}
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