32 lines
1.1 KiB
C++
32 lines
1.1 KiB
C++
#include "Camera.h"
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glm::mat4 Core::createPerspectiveMatrix(float zNear, float zFar, float frustumScale)
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{
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glm::mat4 perspective;
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perspective[0][0] = 1.f;
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perspective[1][1] = frustumScale;
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perspective[2][2] = (zFar + zNear) / (zNear - zFar);
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perspective[3][2] = (2 * zFar * zNear) / (zNear - zFar);
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perspective[2][3] = -1;
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perspective[3][3] = 0;
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return perspective;
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}
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glm::mat4 Core::createViewMatrix( glm::vec3 position, glm::vec3 forward, glm::vec3 up )
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{
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glm::vec3 side = glm::cross(forward, up);
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// Trzeba pamietac o minusie przy ustawianiu osi Z kamery.
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// Wynika to z tego, ze standardowa macierz perspektywiczna zaklada, ze "z przodu" jest ujemna (a nie dodatnia) czesc osi Z.
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glm::mat4 cameraRotation;
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cameraRotation[0][0] = side.x; cameraRotation[1][0] = side.y; cameraRotation[2][0] = side.z;
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cameraRotation[0][1] = up.x; cameraRotation[1][1] = up.y; cameraRotation[2][1] = up.z;
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cameraRotation[0][2] = -forward.x; cameraRotation[1][2] = -forward.y; cameraRotation[2][2] = -forward.z;
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glm::mat4 cameraTranslation;
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cameraTranslation[3] = glm::vec4(-position, 1.0f);
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return cameraRotation * cameraTranslation;
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}
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