diff options
Diffstat (limited to 'source/blender/windowmanager/xr/intern/wm_xr_draw.c')
| -rw-r--r-- | source/blender/windowmanager/xr/intern/wm_xr_draw.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/source/blender/windowmanager/xr/intern/wm_xr_draw.c b/source/blender/windowmanager/xr/intern/wm_xr_draw.c new file mode 100644 index 00000000000..684e59eb8b2 --- /dev/null +++ b/source/blender/windowmanager/xr/intern/wm_xr_draw.c @@ -0,0 +1,162 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +/** \file + * \ingroup wm + * + * \name Window-Manager XR Drawing + * + * Implements Blender specific drawing functionality for use with the Ghost-XR API. + */ + +#include <string.h> + +#include "BLI_math.h" + +#include "ED_view3d_offscreen.h" + +#include "GHOST_C-api.h" + +#include "GPU_viewport.h" + +#include "WM_api.h" + +#include "wm_surface.h" +#include "wm_xr_intern.h" + +void wm_xr_pose_to_viewmat(const GHOST_XrPose *pose, float r_viewmat[4][4]) +{ + float iquat[4]; + invert_qt_qt_normalized(iquat, pose->orientation_quat); + quat_to_mat4(r_viewmat, iquat); + translate_m4(r_viewmat, -pose->position[0], -pose->position[1], -pose->position[2]); +} + +static void wm_xr_draw_matrices_create(const wmXrDrawData *draw_data, + const GHOST_XrDrawViewInfo *draw_view, + const XrSessionSettings *session_settings, + float r_view_mat[4][4], + float r_proj_mat[4][4]) +{ + GHOST_XrPose eye_pose; + + copy_qt_qt(eye_pose.orientation_quat, draw_view->eye_pose.orientation_quat); + copy_v3_v3(eye_pose.position, draw_view->eye_pose.position); + add_v3_v3(eye_pose.position, draw_data->eye_position_ofs); + if ((session_settings->flag & XR_SESSION_USE_POSITION_TRACKING) == 0) { + sub_v3_v3(eye_pose.position, draw_view->local_pose.position); + } + + perspective_m4_fov(r_proj_mat, + draw_view->fov.angle_left, + draw_view->fov.angle_right, + draw_view->fov.angle_up, + draw_view->fov.angle_down, + session_settings->clip_start, + session_settings->clip_end); + + float eye_mat[4][4]; + float base_mat[4][4]; + + wm_xr_pose_to_viewmat(&eye_pose, eye_mat); + /* Calculate the base pose matrix (in world space!). */ + wm_xr_pose_to_viewmat(&draw_data->base_pose, base_mat); + + mul_m4_m4m4(r_view_mat, eye_mat, base_mat); +} + +static void wm_xr_draw_viewport_buffers_to_active_framebuffer( + const wmXrRuntimeData *runtime_data, + const wmXrSurfaceData *surface_data, + const GHOST_XrDrawViewInfo *draw_view) +{ + const bool is_upside_down = GHOST_XrSessionNeedsUpsideDownDrawing(runtime_data->context); + rcti rect = {.xmin = 0, .ymin = 0, .xmax = draw_view->width - 1, .ymax = draw_view->height - 1}; + + wmViewport(&rect); + + /* For upside down contexts, draw with inverted y-values. */ + if (is_upside_down) { + SWAP(int, rect.ymin, rect.ymax); + } + GPU_viewport_draw_to_screen_ex(surface_data->viewport, 0, &rect, draw_view->expects_srgb_buffer); +} + +/** + * \brief Draw a viewport for a single eye. + * + * This is the main viewport drawing function for VR sessions. It's assigned to Ghost-XR as a + * callback (see GHOST_XrDrawViewFunc()) and executed for each view (read: eye). + */ +void wm_xr_draw_view(const GHOST_XrDrawViewInfo *draw_view, void *customdata) +{ + wmXrDrawData *draw_data = customdata; + wmXrData *xr_data = draw_data->xr_data; + wmXrSurfaceData *surface_data = draw_data->surface_data; + wmXrSessionState *session_state = &xr_data->runtime->session_state; + XrSessionSettings *settings = &xr_data->session_settings; + + const int display_flags = V3D_OFSDRAW_OVERRIDE_SCENE_SETTINGS | settings->draw_flags; + + float viewmat[4][4], winmat[4][4]; + + BLI_assert(WM_xr_session_is_ready(xr_data)); + + wm_xr_session_draw_data_update(session_state, settings, draw_view, draw_data); + wm_xr_draw_matrices_create(draw_data, draw_view, settings, viewmat, winmat); + wm_xr_session_state_update(settings, draw_data, draw_view, session_state); + + if (!wm_xr_session_surface_offscreen_ensure(surface_data, draw_view)) { + return; + } + + /* In case a framebuffer is still bound from drawing the last eye. */ + GPU_framebuffer_restore(); + /* Some systems have drawing glitches without this. */ + GPU_clear(GPU_DEPTH_BIT); + + /* Draws the view into the surface_data->viewport's framebuffers */ + ED_view3d_draw_offscreen_simple(draw_data->depsgraph, + draw_data->scene, + &settings->shading, + settings->shading.type, + draw_view->width, + draw_view->height, + display_flags, + viewmat, + winmat, + settings->clip_start, + settings->clip_end, + false, + true, + true, + NULL, + false, + surface_data->offscreen, + surface_data->viewport); + + /* The draw-manager uses both GPUOffscreen and GPUViewport to manage frame and texture buffers. A + * call to GPU_viewport_draw_to_screen() is still needed to get the final result from the + * viewport buffers composited together and potentially color managed for display on screen. + * It needs a bound frame-buffer to draw into, for which we simply reuse the GPUOffscreen one. + * + * In a next step, Ghost-XR will use the currently bound frame-buffer to retrieve the image + * to be submitted to the OpenXR swap-chain. So do not un-bind the off-screen yet! */ + + GPU_offscreen_bind(surface_data->offscreen, false); + + wm_xr_draw_viewport_buffers_to_active_framebuffer(xr_data->runtime, surface_data, draw_view); +} |