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clutter/stage: Setup 2D view internally
Move and simplify cogl_matrix_view_2d_in_perspective() to inside ClutterStage, since it's the only consumer of this API, and remove it from Cogl. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1439
This commit is contained in:
Georges Basile Stavracas Neto
parent
db23ee5829
commit
5db1f67d44
@ -2755,6 +2755,40 @@ calculate_z_translation (float z_near)
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+ z_near;
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}
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static void
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view_2d_in_perspective (graphene_matrix_t *matrix,
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float fov_y,
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float aspect,
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float z_near,
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float z_2d,
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float width_2d,
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float height_2d)
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{
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float top = z_near * tan (fov_y * G_PI / 360.0);
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float left = -top * aspect;
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float right = top * aspect;
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float bottom = -top;
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float left_2d_plane = left / z_near * z_2d;
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float right_2d_plane = right / z_near * z_2d;
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float bottom_2d_plane = bottom / z_near * z_2d;
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float top_2d_plane = top / z_near * z_2d;
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float width_2d_start = right_2d_plane - left_2d_plane;
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float height_2d_start = top_2d_plane - bottom_2d_plane;
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/* Factors to scale from framebuffer geometry to frustum
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* cross-section geometry. */
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float width_scale = width_2d_start / width_2d;
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float height_scale = height_2d_start / height_2d;
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graphene_matrix_init_scale (matrix, width_scale, -height_scale, width_scale);
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graphene_matrix_translate (matrix,
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&GRAPHENE_POINT3D_INIT (left_2d_plane,
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top_2d_plane,
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-z_2d));
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}
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static void
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clutter_stage_update_view_perspective (ClutterStage *stage)
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{
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@ -2779,8 +2813,7 @@ clutter_stage_update_view_perspective (ClutterStage *stage)
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clutter_stage_set_perspective (stage, &perspective);
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cogl_matrix_init_identity (&priv->view);
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cogl_matrix_view_2d_in_perspective (&priv->view,
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view_2d_in_perspective (&priv->view,
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perspective.fovy,
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perspective.aspect,
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perspective.z_near,
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@ -246,63 +246,6 @@ cogl_matrix_init_from_euler (graphene_matrix_t *matrix,
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graphene_matrix_rotate_euler (matrix, euler);
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}
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void
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cogl_matrix_view_2d_in_frustum (graphene_matrix_t *matrix,
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float left,
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float right,
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float bottom,
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float top,
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float z_near,
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float z_2d,
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float width_2d,
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float height_2d)
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{
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float left_2d_plane = left / z_near * z_2d;
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float right_2d_plane = right / z_near * z_2d;
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float bottom_2d_plane = bottom / z_near * z_2d;
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float top_2d_plane = top / z_near * z_2d;
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float width_2d_start = right_2d_plane - left_2d_plane;
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float height_2d_start = top_2d_plane - bottom_2d_plane;
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/* Factors to scale from framebuffer geometry to frustum
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* cross-section geometry. */
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float width_scale = width_2d_start / width_2d;
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float height_scale = height_2d_start / height_2d;
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cogl_matrix_translate (matrix,
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left_2d_plane, top_2d_plane, -z_2d);
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cogl_matrix_scale (matrix, width_scale, -height_scale, width_scale);
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}
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/* Assuming a symmetric perspective matrix is being used for your
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* projective transform this convenience function lets you compose a
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* view transform such that geometry on the z=0 plane will map to
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* screen coordinates with a top left origin of (0,0) and with the
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* given width and height.
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*/
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void
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cogl_matrix_view_2d_in_perspective (graphene_matrix_t *matrix,
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float fov_y,
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float aspect,
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float z_near,
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float z_2d,
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float width_2d,
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float height_2d)
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{
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float top = z_near * tan (fov_y * G_PI / 360.0);
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cogl_matrix_view_2d_in_frustum (matrix,
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-top * aspect,
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top * aspect,
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-top,
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top,
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z_near,
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z_2d,
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width_2d,
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height_2d);
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}
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gboolean
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cogl_matrix_equal (const void *v1, const void *v2)
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{
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@ -308,84 +308,6 @@ cogl_matrix_orthographic (graphene_matrix_t *matrix,
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float near,
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float far);
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/**
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* cogl_matrix_view_2d_in_frustum:
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* @matrix: A 4x4 transformation matrix
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* @left: coord of left vertical clipping plane
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* @right: coord of right vertical clipping plane
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* @bottom: coord of bottom horizontal clipping plane
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* @top: coord of top horizontal clipping plane
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* @z_near: The distance to the near clip plane. Never pass 0 and always pass
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* a positive number.
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* @z_2d: The distance to the 2D plane. (Should always be positive and
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* be between @z_near and the z_far value that was passed to
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* cogl_matrix_frustum())
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* @width_2d: The width of the 2D coordinate system
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* @height_2d: The height of the 2D coordinate system
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*
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* Multiplies @matrix by a view transform that maps the 2D coordinates
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* (0,0) top left and (@width_2d,@height_2d) bottom right the full viewport
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* size. Geometry at a depth of 0 will now lie on this 2D plane.
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*
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* Note: this doesn't multiply the matrix by any projection matrix,
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* but it assumes you have a perspective projection as defined by
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* passing the corresponding arguments to cogl_matrix_frustum().
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* Toolkits such as Clutter that mix 2D and 3D drawing can use this to
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* create a 2D coordinate system within a 3D perspective projected
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* view frustum.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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COGL_EXPORT void
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cogl_matrix_view_2d_in_frustum (graphene_matrix_t *matrix,
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float left,
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float right,
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float bottom,
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float top,
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float z_near,
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float z_2d,
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float width_2d,
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float height_2d);
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/**
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* cogl_matrix_view_2d_in_perspective:
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* @fov_y: A field of view angle for the Y axis
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* @aspect: The ratio of width to height determining the field of view angle
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* for the x axis.
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* @z_near: The distance to the near clip plane. Never pass 0 and always pass
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* a positive number.
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* @z_2d: The distance to the 2D plane. (Should always be positive and
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* be between @z_near and the z_far value that was passed to
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* cogl_matrix_frustum())
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* @width_2d: The width of the 2D coordinate system
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* @height_2d: The height of the 2D coordinate system
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*
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* Multiplies @matrix by a view transform that maps the 2D coordinates
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* (0,0) top left and (@width_2d,@height_2d) bottom right the full viewport
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* size. Geometry at a depth of 0 will now lie on this 2D plane.
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*
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* Note: this doesn't multiply the matrix by any projection matrix,
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* but it assumes you have a perspective projection as defined by
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* passing the corresponding arguments to cogl_matrix_perspective().
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*
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* Toolkits such as Clutter that mix 2D and 3D drawing can use this to
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* create a 2D coordinate system within a 3D perspective projected
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* view frustum.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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COGL_EXPORT void
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cogl_matrix_view_2d_in_perspective (graphene_matrix_t *matrix,
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float fov_y,
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float aspect,
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float z_near,
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float z_2d,
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float width_2d,
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float height_2d);
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/**
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* cogl_matrix_init_from_array:
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* @matrix: A 4x4 transformation matrix
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