Implement rudimentary camera movement controls.

src/glutils.cpp

@@ -30,7 +30,7 @@ static void show_info_log(
     LOG(INFO) << log.get() << endl;
 }
 
-GLuint fmri::loadTexture(DType const *data, unsigned int width, unsigned int height)
+GLuint fmri::loadTexture(DType const *data, int width, int height)
 {
     // Load and scale texture
     vector<DType> textureBuffer(data, data + (width * height));

src/glutils.hpp

@@ -13,7 +13,7 @@ namespace fmri {
      * @param height
      * @return A texture reference.
      */
-    GLuint loadTexture(DType const * data, unsigned int width, unsigned int height);
+    GLuint loadTexture(DType const * data, int width, int height);
 
     /**
      *

src/main.cpp

@@ -4,7 +4,6 @@
 #include <GL/glew.h>
 #include <GL/glut.h>
 #include <map>
-#include <tuple>
 
 #include "LayerData.hpp"
 #include "Options.hpp"
@@ -14,11 +13,20 @@
 using namespace std;
 using namespace fmri;
 
-struct {
+struct
+{
     optional<vector<string>> labels;
     vector<vector<LayerData>> data;
     float angle = 0;
     map<tuple<string, int, int>, GLuint> textureMap;
+
+    struct
+    {
+        float pitch = 0;
+        float yaw = 0;
+
+        float x = 0, y = 0, z = 0;
+    } camera;
 } rendererData;
 
 static vector<vector<LayerData>> getSimulationData(const Options &options)
@@ -51,8 +59,8 @@ static void render()
     // Reset transformations
     glLoadIdentity();
     // Set the camera
-    gluLookAt(	0.0f, 0.0f, 10.0f,
+    gluLookAt(rendererData.camera.x, rendererData.camera.y, rendererData.camera.z - 10,
-                  0.0f, 0.0f,  0.0f,
+              rendererData.camera.x, rendererData.camera.y, rendererData.camera.z,
               0.0f, 1.0f, 0.0f);
 
     glRotatef(rendererData.angle, 0.0f, 1.0f, 0.0f);
@@ -100,9 +108,41 @@ static void reloadTextures(unsigned dataIndex)
     }
 }
 
+static void handleKeys(unsigned char key, int, int)
+{
+    constexpr float rotationScaling = 0.2f;
+    constexpr float movementScaling = 0.2f;
+    switch (key) {
+        case 'a':
+            // TODO: handle rotations
+            rendererData.camera.x += movementScaling;
+            break;
+
+        case 'd':
+            rendererData.camera.x -= rotationScaling;
+            break;
+
+        case 'w':
+            rendererData.camera.z += movementScaling;
+            break;
+
+        case 's':
+            rendererData.camera.z -= movementScaling;
+            break;
+
+        case 'q':
+            // Utility quit function.
+            exit(0);
+
+        default:
+            LOG(INFO) << "Received key: " << key << endl;
+            break;
+    }
+}
 
 
-int main(int argc, char * argv[]) {
+int main(int argc, char *argv[])
+{
     google::InitGoogleLogging(argv[0]);
     google::InstallFailureSignalHandler();
 
@@ -119,6 +159,7 @@ int main(int argc, char * argv[]) {
     glutDisplayFunc(render);
     glutIdleFunc(render);
     glutReshapeFunc(changeWindowSize);
+    glutKeyboardFunc(handleKeys);
 
     glewInit();
     if (!GLEW_VERSION_2_0) {