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64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
/*
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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*/
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#pragma once
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#include "application/editormode.h"
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#include "rendering/renderer.h"
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#include "imgui/imgui.h"
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// world to screen projection of the current camera, for overlays drawn with ImGui
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class screen_projection
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{
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public:
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screen_projection()
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{
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ImGuiIO const &io = ImGui::GetIO();
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m_size = io.DisplaySize;
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m_camera = GfxRenderer->Camera_Position();
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float const aspect = m_size.y > 0.0f ? m_size.x / m_size.y : 1.0f;
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m_viewprojection = editor_mode::projection_matrix(aspect) * GfxRenderer->Camera_View_Matrix();
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}
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glm::vec4 clip(glm::dvec3 const &Point) const
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{
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return m_viewprojection * glm::vec4(glm::vec3(Point - m_camera), 1.0f);
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}
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ImVec2 screen(glm::vec4 const &Clip) const
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{
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return ImVec2((Clip.x / Clip.w * 0.5f + 0.5f) * m_size.x, (0.5f - Clip.y / Clip.w * 0.5f) * m_size.y);
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}
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bool project(glm::dvec3 const &Point, ImVec2 &Screen) const
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{
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auto const c = clip(Point);
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if (c.w < kNear)
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return false;
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Screen = screen(c);
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return true;
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}
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void line(ImDrawList *Drawlist, glm::dvec3 const &A, glm::dvec3 const &B, ImU32 const Color, float const Thickness) const
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{
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glm::vec4 a = clip(A);
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glm::vec4 b = clip(B);
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if (a.w < kNear && b.w < kNear)
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return;
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if (a.w < kNear)
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a = glm::mix(a, b, (kNear - a.w) / (b.w - a.w));
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else if (b.w < kNear)
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b = glm::mix(b, a, (kNear - b.w) / (a.w - b.w));
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Drawlist->AddLine(screen(a), screen(b), Color, Thickness);
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}
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private:
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static constexpr float kNear{0.1f};
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ImVec2 m_size;
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glm::dvec3 m_camera;
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glm::mat4 m_viewprojection;
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};
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