Enable curved power laws in GPU modelling.

These were left as todo!() in my mad rush to get most things working.

In the process of altering model.cu, I found a bug for shapelets with
"list" flux densities (potentially using the wrong beam responses). A
new series of tests verify that beam responses work as intended. Also
add many new tests to ensure the FEE beam is being applied to model
visibilities as expected.

cuda/src_cuda/model.h

@@ -18,10 +18,10 @@ extern "C" {
  * sky-model point-source components.
  *
  * `points` contains coordinates and flux densities for their respective
- * component types. The components are further split into "power law" and "list"
- * types; this is done for efficiency. For the list types, the flux densities
- * ("fds") are two-dimensional arrays, of which the first axis corresponds to
- * frequency and the second component.
+ * component types. The components are further split into "power law", "curved
+ * power law" and "list" types; this is done for efficiency. For the list types,
+ * the flux densities ("fds") are two-dimensional arrays, of which the first
+ * axis corresponds to frequency and the second component.
  *
  * `a` is the populated `Addresses` struct needed to do any sky modelling.
  *

cuda/src_cuda/types.h

@@ -18,6 +18,8 @@
 #define JONES JonesF64
 #endif
 
+#include <stddef.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif // __cplusplus
@@ -135,6 +137,15 @@ typedef struct Points {
     // Spectral indices.
     FLOAT *power_law_sis;
 
+    size_t num_curved_power_law_points;
+    LMN *curved_power_law_lmns;
+    // Instrumental flux densities calculated at 150 MHz.
+    JONES *curved_power_law_fds;
+    // Spectral indices.
+    FLOAT *curved_power_law_sis;
+    // Spectral curvatures.
+    FLOAT *curved_power_law_qs;
+
     size_t num_list_points;
     LMN *list_lmns;
     // Instrumental (i.e. XX, XY, YX, XX).
@@ -153,6 +164,16 @@ typedef struct Gaussians {
     FLOAT *power_law_sis;
     GaussianParams *power_law_gps;
 
+    size_t num_curved_power_law_gaussians;
+    LMN *curved_power_law_lmns;
+    // Instrumental flux densities calculated at 150 MHz.
+    JONES *curved_power_law_fds;
+    // Spectral indices.
+    FLOAT *curved_power_law_sis;
+    // Spectral curvatures.
+    FLOAT *curved_power_law_qs;
+    GaussianParams *curved_power_law_gps;
+
     size_t num_list_gaussians;
     LMN *list_lmns;
     // Instrumental (i.e. XX, XY, YX, XX).
@@ -175,6 +196,19 @@ typedef struct Shapelets {
     ShapeletCoeff *power_law_shapelet_coeffs;
     size_t *power_law_num_shapelet_coeffs;
 
+    size_t num_curved_power_law_shapelets;
+    LMN *curved_power_law_lmns;
+    // Instrumental flux densities calculated at 150 MHz.
+    JONES *curved_power_law_fds;
+    // Spectral indices.
+    FLOAT *curved_power_law_sis;
+    // Spectral curvatures.
+    FLOAT *curved_power_law_qs;
+    GaussianParams *curved_power_law_gps;
+    ShapeletUV *curved_power_law_shapelet_uvs;
+    ShapeletCoeff *curved_power_law_shapelet_coeffs;
+    size_t *curved_power_law_num_shapelet_coeffs;
+
     size_t num_list_shapelets;
     LMN *list_lmns;
     // Instrumental (i.e. XX, XY, YX, XX).