💿🐜 Antkeeper source code
https://antkeeper.com
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157 lines
5.0 KiB
157 lines
5.0 KiB
/*
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* Copyright (C) 2023 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <engine/scene/billboard.hpp>
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#include <engine/config.hpp>
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#include <engine/render/vertex-attribute.hpp>
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#include <engine/geom/projection.hpp>
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#include <engine/scene/camera.hpp>
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namespace scene {
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billboard::billboard()
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{
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const float vertex_data[] =
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{
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-1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f,
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-1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f,
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1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f,
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1.0f, 1.0f, 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f,
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-1.0f, -1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f,
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1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f
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};
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const std::size_t vertex_size = 8;
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const std::size_t vertex_stride = sizeof(float) * vertex_size;
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const std::size_t vertex_count = 6;
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m_vbo = std::make_unique<gl::vertex_buffer>(gl::buffer_usage::static_draw, sizeof(float) * vertex_size * vertex_count, std::as_bytes(std::span{vertex_data}));
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std::size_t attribute_offset = 0;
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// Define position vertex attribute
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gl::vertex_attribute position_attribute;
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position_attribute.buffer = m_vbo.get();
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position_attribute.offset = attribute_offset;
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position_attribute.stride = vertex_stride;
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position_attribute.type = gl::vertex_attribute_type::float_32;
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position_attribute.components = 3;
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attribute_offset += position_attribute.components * sizeof(float);
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// Define UV vertex attribute
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gl::vertex_attribute uv_attribute;
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uv_attribute.buffer = m_vbo.get();
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uv_attribute.offset = attribute_offset;
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uv_attribute.stride = vertex_stride;
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uv_attribute.type = gl::vertex_attribute_type::float_32;
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uv_attribute.components = 2;
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attribute_offset += uv_attribute.components * sizeof(float);
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// Define barycentric vertex attribute
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gl::vertex_attribute barycentric_attribute;
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barycentric_attribute.buffer = m_vbo.get();
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barycentric_attribute.offset = attribute_offset;
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barycentric_attribute.stride = vertex_stride;
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barycentric_attribute.type = gl::vertex_attribute_type::float_32;
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barycentric_attribute.components = 3;
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//attribute_offset += barycentric_attribute.components * sizeof(float);
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// Bind vertex attributes to VAO
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m_vao = std::make_unique<gl::vertex_array>();
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m_vao->bind(render::vertex_attribute::position, position_attribute);
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m_vao->bind(render::vertex_attribute::uv, uv_attribute);
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m_vao->bind(render::vertex_attribute::barycentric, barycentric_attribute);
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// Init render operation
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m_render_op.vertex_array = m_vao.get();
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m_render_op.drawing_mode = gl::drawing_mode::triangles;
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m_render_op.start_index = 0;
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m_render_op.index_count = 6;
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m_render_op.transform = float4x4::identity();
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}
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void billboard::render(render::context& ctx) const
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{
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// Align billboard
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switch (m_billboard_type)
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{
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case scene::billboard_type::spherical:
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{
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auto transform = get_transform();
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transform.rotation = math::normalize(math::look_rotation(ctx.camera->get_forward(), ctx.camera->get_up()) * transform.rotation);
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m_render_op.transform = math::matrix_cast(transform);
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break;
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}
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case scene::billboard_type::cylindrical:
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{
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auto transform = get_transform();
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auto look = math::normalize(geom::project_on_plane(transform.translation - ctx.camera->get_translation(), {0.0f, 0.0f, 0.0f}, m_alignment_axis));
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const auto right = math::normalize(math::cross(m_alignment_axis, look));
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look = math::cross(right, m_alignment_axis);
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const auto up = math::cross(look, right);
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transform.rotation = math::normalize(math::look_rotation(look, up) * transform.rotation);
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m_render_op.transform = math::matrix_cast(transform);
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break;
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}
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case scene::billboard_type::flat:
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break;
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default:
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break;
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}
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m_render_op.depth = ctx.camera->get_view_frustum().near().distance(get_translation());
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ctx.operations.emplace_back(&m_render_op);
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}
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void billboard::set_material(std::shared_ptr<render::material> material)
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{
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m_render_op.material = material;
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}
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void billboard::set_billboard_type(billboard_type type)
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{
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m_billboard_type = type;
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if (m_billboard_type == scene::billboard_type::flat)
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{
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m_render_op.transform = math::matrix_cast(get_transform());
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}
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}
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void billboard::transformed()
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{
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m_bounds = {get_translation() - get_scale(), get_translation() + get_scale()};
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if (m_billboard_type == scene::billboard_type::flat)
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{
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m_render_op.transform = math::matrix_cast(get_transform());
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}
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}
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} // namespace scene
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