75 lines
2.0 KiB
C++
75 lines
2.0 KiB
C++
#ifndef Events_Picking_h__
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#define Events_Picking_h__
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#include "../OpenGL.h"
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#include "../GLM.h"
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#include "../Core/EventBroker.h"
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#include "Util/ScreenCoords.h"
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#include "FrameBuffer.h"
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#include "../Core/Entity.h"
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#include "Util/UnorderedMapVec2.h"
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namespace Events
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{
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/** Thrown Every frame, use functions to pick*/
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struct Picking : Event
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{
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public:
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Picking(FrameBuffer* pickingBuffer, GLuint* depthBuffer, glm::mat4 projectionMatrix, glm::mat4 viewMatrix, Rectangle resolution, const std::unordered_map<glm::vec2, EntityID>* pickingColorsToEntity)
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: PickingBuffer(pickingBuffer)
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, DepthBuffer(depthBuffer)
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, ProjectionMatrix(projectionMatrix)
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, ViewMatrix(viewMatrix)
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, Resolution(resolution)
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, PickingColorsToEntity(pickingColorsToEntity)
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{ }
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struct PickData
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{
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//Picked Entity
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EntityID Entity;
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//World position of the "pick"
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glm::vec3 Position;
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// Depth
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float Depth;
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};
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PickData Pick(glm::vec2 screenCoord) const
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{
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PickData pickData;
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// Invert screen y coordinate
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screenCoord.y = Resolution.Height - screenCoord.y;
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ScreenCoords::PixelData data = ScreenCoords::ToPixelData(screenCoord, PickingBuffer, *DepthBuffer);
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pickData.Depth = data.Depth;
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auto it = PickingColorsToEntity->find(glm::vec2(data.Color[0], data.Color[1]));
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if (it != PickingColorsToEntity->end()) {
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pickData.Entity = it->second;
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} else {
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pickData.Entity = 0;
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}
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pickData.Position = ScreenCoords::ToWorldPos(screenCoord.x, screenCoord.y, data.Depth, Resolution, ProjectionMatrix, ViewMatrix);
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return pickData;
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}
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private:
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FrameBuffer* PickingBuffer;
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GLuint* DepthBuffer;
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const glm::mat4 ProjectionMatrix;
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const glm::mat4 ViewMatrix;
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const Rectangle Resolution;
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const std::unordered_map<glm::vec2, EntityID>* PickingColorsToEntity;
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};
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}
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#endif
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