Add camera controls

imgui.ini

@@ -4,8 +4,8 @@ Size=400,400
 Collapsed=0
 
 [Window][Terrain Controls]
-Pos=868,19
-Size=412,701
+Pos=863,19
+Size=417,701
 Collapsed=0
 DockId=0x00000002,0
 
@@ -24,12 +24,12 @@ Collapsed=0
 
 [Window][Scene Window]
 Pos=0,19
-Size=866,701
+Size=861,701
 Collapsed=0
 DockId=0x00000001,0
 
 [Docking][Data]
 DockSpace   ID=0x6F42A598 Window=0xE80F322C Pos=0,19 Size=1280,701 Split=X Selected=0x9F2D9299
-  DockNode  ID=0x00000001 Parent=0x6F42A598 SizeRef=866,701 CentralNode=1 Selected=0x9F2D9299
-  DockNode  ID=0x00000002 Parent=0x6F42A598 SizeRef=412,701 Selected=0xF69494A7
+  DockNode  ID=0x00000001 Parent=0x6F42A598 SizeRef=861,701 CentralNode=1 Selected=0x9F2D9299
+  DockNode  ID=0x00000002 Parent=0x6F42A598 SizeRef=417,701 Selected=0xF69494A7
 

include/camera.h

@@ -0,0 +1,39 @@
+#ifndef CAMERA_H_
+#define CAMERA_H_
+
+#define GLM_ENABLE_EXPERIMENTAL
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtx/transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+#include "transform.h"
+
+struct Camera {
+    Transform transform;
+    float focalLength; // In mm
+    float sensorHeight;
+    float nearPlane;
+    float farPlane;
+};
+
+namespace CameraControls {
+    void TranslateCamera(Camera& camera, const glm::vec3& translationDelta);
+    void RotateCamera(Camera& camera, const glm::vec3& rotationDelta);
+
+    void SetPosition(Camera& camera, const glm::vec3& position);
+    void SetRotation(Camera& camera, const glm::vec3& rotation);
+
+    glm::vec3 GetPosition(Camera& camera);
+    glm::vec3 GetCenter(Camera& camera);
+    float GetFOV(Camera& camera);
+
+    void AdjustFocalLength(Camera& camera, float focalLength);
+    void AdjustSensorHeight(Camera& camera, float sensorHeight);
+    void AdjustNearPlane(Camera& camera, float nearPlane);
+    void AdjustFarPlane(Camera& camera, float farPlane);
+
+    glm::mat4 GetViewMatrix(Camera& camera);
+}
+
+#endif // CAMERA_H_

include/scene.h

@@ -7,6 +7,7 @@
 #include <string>
 
 #include "fbo.h"
+#include "camera.h"
 
 struct Vertex {
     glm::vec3 position;
@@ -34,6 +35,7 @@ class Scene {
         void InitQuadBuffers();
         void InitShaders();
 
+        Camera activeCamera_;
         Framebuffer geo_fbo_;
         Framebuffer lht_fbo_;
         GLuint shader_program_;

include/transform.h

@@ -0,0 +1,22 @@
+#ifndef TRANSFORM_H_
+#define TRANSFORM_H_
+
+#include <glm/glm.hpp>
+
+struct Transform {
+    glm::vec3 translation;
+    glm::vec3 rotation;
+    glm::vec3 scale;
+};
+
+namespace TransformControls {
+    void SetPosition(Transform& transform, const glm::vec3& newPosition);
+    void SetRotation(Transform& transform, const glm::vec3& newRotation);
+    void SetScale(Transform& transform, const glm::vec3& newScale);
+
+    void Translate(Transform& transform, const glm::vec3& translationDelta);
+    void Rotate(Transform& transform, const glm::vec3& rotationDelta);
+    void Scale(Transform& transform, const glm::vec3& scaleDelta);
+}
+
+#endif // TRANSFORM_H_

source/camera.cpp

@@ -0,0 +1,53 @@
+#include "camera.h"
+
+namespace CameraControls {
+    void TranslateCamera(Camera& camera, const glm::vec3& translationDelta) {
+        TransformControls::Translate(camera.transform, translationDelta);
+    }
+    void RotateCamera(Camera& camera, const glm::vec3& rotationDelta) {
+        TransformControls::Rotate(camera.transform, rotationDelta);
+    }
+
+    void SetPosition(Camera& camera, const glm::vec3& position) {
+        TransformControls::SetPosition(camera.transform, position);
+    }
+    void SetRotation(Camera& camera, const glm::vec3& rotation) {
+        TransformControls::SetRotation(camera.transform, rotation);
+    }
+
+    glm::vec3 GetPosition(Camera& camera) {
+        return camera.transform.translation;
+    }
+    glm::vec3 GetRotation(Camera& camera) {
+        return camera.transform.rotation;
+    }
+    glm::vec3 GetCenter(Camera& camera) {
+        glm::vec3 forward;
+        forward.x = cos(camera.transform.rotation.y) * cos(camera.transform.rotation.x);
+        forward.y = sin(camera.transform.rotation.x);
+        forward.z = sin(camera.transform.rotation.y) * cos(camera.transform.rotation.x);
+
+        return GetPosition(camera) + GetRotation(camera);
+    }
+    float GetFOV(Camera& camera) {
+        return 2.0f * atan(camera.sensorHeight / (2.0f * camera.focalLength));
+    }
+
+    void AdjustFocalLength(Camera& camera, float focalLength) {
+        camera.focalLength = focalLength;
+    }
+    void AdjustSensorHeight(Camera& camera, float sensorHeight) {
+        camera.sensorHeight = sensorHeight;
+    }
+    void AdjustNearPlane(Camera& camera, float nearPlane) {
+        camera.nearPlane = nearPlane;
+    }
+    void AdjustFarPlane(Camera& camera, float farPlane) {
+        camera.farPlane = farPlane;
+    }
+
+    glm::mat4 GetViewMatrix(Camera& camera) {
+        //return glm::lookAt(glm::vec3(0.0f, 1.4f, 1.4f), glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f));
+        return glm::lookAt(GetPosition(camera), GetCenter(camera), glm::vec3(0.0f, 1.0f, 0.0f));
+    }
+}

source/fbo.cpp

@@ -48,7 +48,7 @@ namespace {
         glFramebufferTexture2D(GL_FRAMEBUFFER, attachment, GL_TEXTURE_2D, textureId, 0);
     }
 
-}; // namespace
+} // namespace
 
 namespace FBO {
     Framebuffer GenerateFramebuffer(int width, int height) {
@@ -102,4 +102,4 @@ namespace FBO {
             glDeleteFramebuffers(1, &fbo.id);
         }
     }
-}; // namespace
+} // namespace FBO

source/scene.cpp

@@ -22,6 +22,7 @@
 #include <algorithm>
 
 #include "scene.h"
+#include "camera.h"
 #include "Uniforms.h"
 #include "InitShader.h" 
 #include "DebugCallback.h"
@@ -85,6 +86,13 @@ void Scene::Init() {
     ReloadShader();
     InitQuadBuffers();
 
+    CameraControls::SetPosition(activeCamera_, glm::vec3(1.4f, 1.4f, 0.0f));
+    CameraControls::SetRotation(activeCamera_, -glm::normalize(CameraControls::GetPosition(activeCamera_)));
+    CameraControls::AdjustFocalLength(activeCamera_, 50.0f); // Temporary hardcode focal length
+    CameraControls::AdjustSensorHeight(activeCamera_, 24.0f); // Temporary hardcode focal length
+    CameraControls::AdjustNearPlane(activeCamera_, near_z_);
+    CameraControls::AdjustFarPlane(activeCamera_, far_z_);
+
     UpdateCamera();
     Uniforms::Init();
 }
@@ -211,8 +219,7 @@ void Scene::Display(GLFWwindow* window) {
 
     //glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 
-    view_matrix_ = glm::lookAt(glm::vec3(0.0f, 1.4f, 1.4f), glm::vec3(0.0f, 0.0f, 0.0f), glm::vec3(0.0f, 1.0f, 0.0f));
-    Uniforms::SceneData.PV = projection_matrix_ * view_matrix_; // Projection-View matrix
+    Uniforms::SceneData.PV = projection_matrix_ * CameraControls::GetViewMatrix(activeCamera_); // Projection-View matrix
     Uniforms::BufferSceneData();
 
     glm::mat4 model_matrix = glm::rotate(angle_, glm::vec3(1.0f, 0.0f, 0.0f)) * glm::scale(glm::vec3(scale_));
@@ -366,7 +373,7 @@ std::vector<int16_t> Scene::LoadHGT(const std::string& filename, int width, int
 }
 
 void Scene::UpdateCamera() {
-    projection_matrix_ = glm::perspective(fov_, aspect_, near_z_, far_z_);
+    projection_matrix_ = glm::perspective(CameraControls::GetFOV(activeCamera_), aspect_, activeCamera_.nearPlane, activeCamera_.farPlane);
 }
 
 GLuint Scene::CreateHeightmapTexture(std::vector<int16_t> data, int width, int height) {

source/transform.cpp

@@ -0,0 +1,23 @@
+#include "transform.h"
+
+namespace TransformControls {
+    void SetPosition(Transform& transform, const glm::vec3& newPosition) {
+        transform.translation = newPosition;
+    }
+    void SetRotation(Transform& transform, const glm::vec3& newRotation) {
+        transform.rotation = newRotation;
+    }
+    void SetScale(Transform& transform, const glm::vec3& newScale) {
+        transform.scale = newScale;
+    }
+
+    void Translate(Transform& transform, const glm::vec3& translationDelta) {
+        transform.translation += translationDelta;
+    }
+    void Rotate(Transform& transform, const glm::vec3& rotationDelta) {
+        transform.rotation += rotationDelta;
+    }
+    void Scale(Transform& transform, const glm::vec3& scaleDelta) {
+        transform.scale *= scaleDelta;
+    }
+}