75 lines
1.8 KiB
C++
Executable File
75 lines
1.8 KiB
C++
Executable File
#include <glm/gtx/rotate_vector.hpp>
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#include "camera.hpp"
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using glm::vec4;
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using glm::rotate;
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using glm::radians;
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using glm::cross;
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void Camera::reset() {
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// Recalculate look at and invert it.
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m_inv_view_matrix = inverse(lookAt(m_eye, m_look, m_up));
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}
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void Camera::translate(vec3 t) {
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// Create a translation matrix.
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mat4 t_matrix = glm::translate(mat4(1.0f), t);
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// Compute new eye and look at position (in homogeneous coordinates).
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vec4 new_eye = t_matrix * vec4(m_eye, 1.0f);
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vec4 new_look = t_matrix * vec4(m_look, 1.0f);
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// Set new eye and look at.
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m_eye = vec3(new_eye.x, new_eye.y, new_eye.z);
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m_look = vec3(new_look.x, new_look.y, new_look.z);
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// Recalculate the view matrix.
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reset();
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}
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void Camera::pitch(float angle) {
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// Calculate view direction and left vector.
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vec3 view_dir = normalize(m_look - m_eye);
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vec3 left = cross(view_dir, m_up);
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// Rotate the view direction.
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view_dir = rotate(view_dir, radians(angle), left);
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// Rotate the up vector
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m_up = normalize(rotate(m_up, radians(angle), left));
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// Compute new look at.
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m_look = m_eye + view_dir;
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// Recalculate the view matrix.
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reset();
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}
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void Camera::yaw(float angle) {
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// Compute and rotate the view direction.
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vec3 view_dir = rotate(normalize(m_look - m_eye), radians(angle), m_up);
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// Compute new look at.
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m_look = m_eye + view_dir;
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// Recalculate the view matrix.
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reset();
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}
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void Camera::roll(float angle) {
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// Rotate the up vector.
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m_up = normalize(rotate(m_up, radians(angle), normalize(m_look - m_eye)));
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// Recalculate the view matrix.
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reset();
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}
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void Camera::view_to_world(Ray & r) const {
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vec4 dir = m_inv_view_matrix * vec4(r.m_direction, 0.0f);
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vec4 orig = m_inv_view_matrix * vec4(r.m_origin, 1.0f);
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r.m_direction = vec3(dir.x, dir.y, dir.z);
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r.m_origin = vec3(orig.x, orig.y, orig.z);
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}
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