81 lines
3.5 KiB
C++
81 lines
3.5 KiB
C++
#pragma once
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/*
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program 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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* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_GRAPHICS_RAYCAST_H
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#define BLT_GRAPHICS_RAYCAST_H
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#include <blt/math/vectors.h>
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#include <blt/math/matrix.h>
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#include <type_traits>
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namespace blt::gfx
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{
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template<typename... Args>
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inline const bool not_float_v = (std::is_arithmetic_v<Args> && ...) && (!std::is_same_v<float, Args> && ...);
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blt::vec3 calculateRay3D(float mx, float my, float width, float height, const blt::mat4x4& view, const blt::mat4x4& proj);
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blt::vec3 calculateRay3D(float width, float height, const blt::mat4x4& view, const blt::mat4x4& proj);
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blt::vec3 calculateRay2D(float mx, float my, float width, float height, const blt::vec3 scale, const blt::mat4x4& view, const blt::mat4x4& proj);
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blt::vec3 calculateRay2D(float width, float height, const blt::vec3 scale, const blt::mat4x4& view, const blt::mat4x4& proj);
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template<typename T, typename G, std::enable_if_t<not_float_v<T, G>, bool> = true>
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inline blt::vec3 calculateRay2D(T width, G height, const blt::vec3& scale, const blt::mat4x4& view, const blt::mat4x4& proj)
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{
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return calculateRay2D(static_cast<float>(width), static_cast<float>(height), scale, view, proj);
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}
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template<typename T, typename G, typename V, typename N, std::enable_if_t<not_float_v<T, G, V, N>, bool> = true>
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inline blt::vec3 calculateRay2D(T mx, G my, V width, N height, const blt::vec3& scale, const blt::mat4x4& view, const blt::mat4x4& proj)
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{
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return calculateRay2D(static_cast<float>(mx), static_cast<float>(my),
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static_cast<float>(width), static_cast<float>(height), scale, view, proj);
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}
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template<typename T, typename G, std::enable_if_t<not_float_v<T, G>, bool> = true>
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inline blt::vec3 calculateRay3D(T width, G height, const blt::mat4x4& view, const blt::mat4x4& proj)
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{
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return calculateRay3D(static_cast<float>(width), static_cast<float>(height), view, proj);
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}
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template<typename T, typename G, typename V, typename N, std::enable_if_t<not_float_v<T, G, V, N>, bool> = true>
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inline blt::vec3 calculateRay3D(T mx, G my, V width, N height, const blt::mat4x4& view, const blt::mat4x4& proj)
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{
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return calculateRay3D(static_cast<float>(mx), static_cast<float>(my), static_cast<float>(width), static_cast<float>(height), view, proj);
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}
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namespace detail
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{
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blt::vec3 toWorldCoords(const blt::vec4& eyeCoords, const blt::mat4x4& view);
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blt::vec4 toEyeCoords(const blt::vec4& clipCoords, const blt::mat4x4& proj);
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inline blt::vec2 getNormalisedDeviceCoordinates(float mx, float my, float width, float height)
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{
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float x = (2.0f * mx) / width - 1.0f;
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float y = (2.0f * my) / height - 1.0f;
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return blt::vec2(x, y);
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}
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}
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}
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#endif //BLT_GRAPHICS_RAYCAST_H
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