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