Viewport: Stereoscopy drawing is back

The viewport stereoscopy support helpers are finally ported to 2.80.

We now can scale the camera and the "stereo cameras" will scale
in the viewport as well (unlike 2.7x).

At the moment I disabled the drawing of the camera frame when
stereo is selected and you are looking through the camera.

It is to be fixed later, but for now it draws the border wrong.
In 2.79 this was not a problem because the camera frame was drawn
afterwards as a hack.

Viewport > Stereoscopy:
* Cameras
* Convergence plane
* Convergence plane alpha
* Stereoscopy volume
* Stereoscopy volume alpha

2 files changed, 17 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_camera.h b/source/blender/blenkernel/BKE_camera.h
index 91f03e46723..6cdd232e97c 100644
--- a/source/blender/blenkernel/BKE_camera.h
+++ b/source/blender/blenkernel/BKE_camera.h
@@ -141,6 +141,7 @@ struct Object *BKE_camera_multiview_render(struct Scene *scene, struct Object *c
 void           BKE_camera_multiview_view_matrix(struct RenderData *rd, const struct Object *camera, const bool is_left, float r_viewmat[4][4]);
 void           BKE_camera_multiview_model_matrix(struct RenderData *rd, const struct Object *camera, const char *viewname, float r_modelmat[4][4]);
 void           BKE_camera_multiview_model_matrix_scaled(struct RenderData *rd, const struct Object *camera, const char *viewname, float r_modelmat[4][4]);
+void           BKE_camera_multiview_window_matrix(struct RenderData *rd, const struct Object *camera, const char *viewname, float r_winmat[4][4]);
 float          BKE_camera_multiview_shift_x(struct RenderData *rd, const struct Object *camera, const char *viewname);
 void           BKE_camera_multiview_params(struct RenderData *rd, struct CameraParams *params, const struct Object *camera, const char *viewname);
 bool           BKE_camera_multiview_spherical_stereo(struct RenderData *rd, const struct Object *camera);
diff --git a/source/blender/blenkernel/intern/camera.c b/source/blender/blenkernel/intern/camera.c
index c39c8dec25d..d791ab01482 100644
--- a/source/blender/blenkernel/intern/camera.c
+++ b/source/blender/blenkernel/intern/camera.c
@@ -798,6 +798,22 @@ void BKE_camera_multiview_model_matrix_scaled(RenderData *rd, const Object *came
 	}
 }
 
+void BKE_camera_multiview_window_matrix(RenderData *rd, const Object *camera, const char *viewname, float r_winmat[4][4])
+{
+	CameraParams params;
+
+	/* Setup parameters */
+	BKE_camera_params_init(&params);
+	BKE_camera_params_from_object(&params, camera);
+	BKE_camera_multiview_params(rd, &params, camera, viewname);
+
+	/* Compute matrix, viewplane, .. */
+	BKE_camera_params_compute_viewplane(&params, rd->xsch, rd->ysch, rd->xasp, rd->yasp);
+	BKE_camera_params_compute_matrix(&params);
+
+	copy_m4_m4(r_winmat, params.winmat);
+}
+
 bool BKE_camera_multiview_spherical_stereo(RenderData *rd, const Object *camera)
 {
 	Camera *cam;