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