[vlc-devel] [PATCH 07/14] opengl: handle the viewpoint changes when rendering

[Steve Lhomme]

---
 modules/video_output/gl.c     |  6 ++++++
 modules/video_output/opengl.c | 25 ++++++++++++++++++++++---
 modules/video_output/opengl.h |  3 +++
 3 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/modules/video_output/gl.c b/modules/video_output/gl.c
index 082aa78..34988c0 100644
--- a/modules/video_output/gl.c
+++ b/modules/video_output/gl.c
@@ -249,6 +249,12 @@ static int Control (vout_display_t *vd, int query, va_list ap)
         vlc_gl_ReleaseCurrent (sys->gl);
         return VLC_SUCCESS;
       }
+      case VOUT_DISPLAY_CHANGE_VIEWPOINT:
+      {
+        const vout_display_cfg_t *p_cfg = va_arg (ap, const vout_display_cfg_t *);
+        vout_display_opengl_SetViewpoint(sys->vgl, &p_cfg->viewpoint);
+        return VLC_SUCCESS;
+      }
       default:
         msg_Err (vd, "Unknown request %d", query);
     }
diff --git a/modules/video_output/opengl.c b/modules/video_output/opengl.c
index b79bb13..9193a51 100644
--- a/modules/video_output/opengl.c
+++ b/modules/video_output/opengl.c
@@ -205,6 +205,7 @@ struct vout_display_opengl_t {
     /* View point */
     float f_teta;
     float f_phi;
+    float f_roll;
     float f_zoom;
 };
 
@@ -692,9 +693,12 @@ vout_display_opengl_t *vout_display_opengl_New(video_format_t *fmt,
     if (vgl->fmt.projection_mode == PROJECTION_MODE_EQUIRECTANGULAR
         || vgl->fmt.projection_mode == PROJECTION_MODE_CUBEMAP_LAYOUT_STANDARD)
     {
-        vgl->f_teta = vgl->fmt.f_pose_roll_degrees / 180. * M_PI;
-        vgl->f_phi  = vgl->fmt.f_pose_yaw_degrees  / 180. * M_PI;
-        vgl->f_teta -= M_PI/2;
+        vlc_viewpoint_t viewpoint = {
+            .f_yaw   = (float) vgl->fmt.f_pose_yaw_degrees   / 180. * M_PI,
+            .f_pitch = (float) vgl->fmt.f_pose_pitch_degrees / 180. * M_PI,
+            .f_roll  = (float) vgl->fmt.f_pose_roll_degrees  / 180. * M_PI,
+        };
+        vout_display_opengl_SetViewpoint( vgl, &viewpoint );
     }
 
     /* */
@@ -777,6 +781,21 @@ void vout_display_opengl_Delete(vout_display_opengl_t *vgl)
     free(vgl);
 }
 
+void vout_display_opengl_SetViewpoint(vout_display_opengl_t *vgl, const vlc_viewpoint_t *p_viewpoint)
+{
+    const projection_mode proj_mode = vout_display_projection(vgl);
+
+    vgl->f_teta = p_viewpoint->f_yaw - M_PI / 2;
+    if (vgl->f_teta < -M_PI)
+        vgl->f_teta = M_PI;
+    vgl->f_phi = p_viewpoint->f_pitch;
+    if (vgl->f_phi < -M_PI / 2)
+        vgl->f_phi = -M_PI / 2;
+    vgl->f_roll = p_viewpoint->f_roll;
+    if (vgl->f_roll < -M_PI / 2)
+        vgl->f_roll = -M_PI / 2;
+}
+
 picture_pool_t *vout_display_opengl_GetPool(vout_display_opengl_t *vgl, unsigned requested_count)
 {
     if (vgl->pool)
diff --git a/modules/video_output/opengl.h b/modules/video_output/opengl.h
index 4ae9400..2096309 100644
--- a/modules/video_output/opengl.h
+++ b/modules/video_output/opengl.h
@@ -32,6 +32,7 @@
 #include <vlc_common.h>
 #include <vlc_picture_pool.h>
 #include <vlc_opengl.h>
+#include <vlc_vout.h>
 
 /* Change USE_OPENGL_ES value to set the OpenGL ES version (1, 2) you want to use
  * A value of 0 will activate normal OpenGL */
@@ -96,6 +97,8 @@ void vout_display_opengl_Delete(vout_display_opengl_t *vgl);
 
 picture_pool_t *vout_display_opengl_GetPool(vout_display_opengl_t *vgl, unsigned);
 
+void vout_display_opengl_SetViewpoint(vout_display_opengl_t *vgl, const vlc_viewpoint_t*);
+
 int vout_display_opengl_Prepare(vout_display_opengl_t *vgl,
                                 picture_t *picture, subpicture_t *subpicture);
 int vout_display_opengl_Display(vout_display_opengl_t *vgl,
-- 
2.8.2