(slightly) better camera handling

[blobs.git] / src / graphics / viewport.cpp

diff --git a/src/graphics/viewport.cpp b/src/graphics/viewport.cpp
index cb8d786227f28a2cedf6fbb1a370b047570f5d7e..2d9b469236a07d8f2ce84da43d014530836c09e7 100644 (file)
--- a/src/graphics/viewport.cpp
+++ b/src/graphics/viewport.cpp
@@ -2,7 +2,9 @@
 #include "Viewport.hpp"
 
 #include "../const.hpp"
+#include "../world/Body.hpp"
 
+#include <cmath>
 #include <GL/glew.h>
 #include <glm/gtx/transform.hpp>
 
@@ -10,41 +12,117 @@
 namespace blobs {
 namespace graphics {
 
-Camera::Camera() noexcept
+Camera::Camera(const world::Body &r) noexcept
 : fov(PI_0p25)
 , aspect(1.0f)
 , near(0.1f)
-, far(256.0f)
+, far(12560.0f)
 , projection(glm::perspective(fov, aspect, near, far))
-, view(1.0f) {
+, view(1.0f)
+, ref(&r)
+, track_orient(false) {
 
 }
 
 Camera::~Camera() noexcept {
 }
 
-void Camera::FOV(float f) noexcept {
+Camera &Camera::FOV(float f) noexcept {
        fov = f;
        UpdateProjection();
+       return *this;
 }
 
-void Camera::Aspect(float r) noexcept {
+Camera &Camera::Aspect(float r) noexcept {
        aspect = r;
        UpdateProjection();
+       return *this;
 }
 
-void Camera::Aspect(float w, float h) noexcept {
+Camera &Camera::Aspect(float w, float h) noexcept {
        Aspect(w / h);
+       return *this;
 }
 
-void Camera::Clip(float n, float f) noexcept {
+Camera &Camera::Clip(float n, float f) noexcept {
        near = n;
        far = f;
        UpdateProjection();
+       return *this;
 }
 
-void Camera::View(const glm::mat4 &v) noexcept {
-       view = v;
+Camera &Camera::Reference(const world::Body &r) noexcept {
+       ref = &r;
+       return *this;
+}
+
+Camera &Camera::FirstPerson(int srf, const glm::vec3 &pos, const glm::vec3 &at) noexcept {
+       track_orient = true;
+
+       float dir = srf < 3 ? 1.0f : -1.0f;
+
+       glm::vec3 position;
+       position[(srf + 0) % 3] = pos.x;
+       position[(srf + 1) % 3] = pos.y;
+       position[(srf + 2) % 3] = dir * (pos.z + Reference().Radius());
+
+       glm::vec3 up(0.0f);
+       up[(srf + 2) % 3] = dir;
+
+       glm::vec3 target;
+       target[(srf + 0) % 3] = at.x;
+       target[(srf + 1) % 3] = at.y;
+       target[(srf + 2) % 3] = dir * (at.z + Reference().Radius());
+
+       view = glm::lookAt(position, target, up);
+
+       return *this;
+}
+
+Camera &Camera::MapView(int srf, const glm::vec3 &pos, float roll) noexcept {
+       track_orient = true;
+
+       float dir = srf < 3 ? 1.0f : -1.0f;
+
+       glm::vec3 position;
+       position[(srf + 0) % 3] = pos.x;
+       position[(srf + 1) % 3] = pos.y;
+       position[(srf + 2) % 3] = dir * (pos.z + Reference().Radius());
+
+       glm::vec3 up(0.0f);
+       up[(srf + 0) % 3] = std::cos(roll);
+       up[(srf + 1) % 3] = std::sin(roll);
+       up[(srf + 2) % 3] = 0.0f;
+
+       glm::vec3 target = position;
+       target[(srf + 2) % 3] -= dir;
+
+       view = glm::lookAt(position, target, up);
+
+       return *this;
+}
+
+Camera &Camera::Orbital(const glm::vec3 &pos) noexcept {
+       track_orient = false;
+       view = glm::lookAt(pos, glm::vec3(0.0f), glm::vec3(0.0f, 1.0f, 0.0f));
+       return *this;
+}
+
+glm::mat4 Camera::Model(const world::Body &b) const noexcept {
+       if (&b == ref) {
+               return track_orient ? glm::mat4(1.0f) : glm::mat4(ref->LocalTransform());
+       } else if (b.HasParent() && &b.Parent() == ref) {
+               return track_orient
+                       ? ref->InverseTransform() * b.FromParent() * b.LocalTransform()
+                       : b.FromParent() * b.LocalTransform();
+       } else if (ref->HasParent() && &ref->Parent() == &b) {
+               return track_orient
+                       ? ref->InverseTransform() * ref->ToParent() * b.LocalTransform()
+                       : ref->ToParent() * b.LocalTransform();
+       } else {
+               // TODO: model matrices for path distances > 1
+               return track_orient ? glm::mat4(1.0f) : glm::mat4(ref->LocalTransform());
+       }
 }
 
 void Camera::UpdateProjection() noexcept {