sars: add ndc->bpc conversion helpers

bpc = boxed projection coordinates, this basically comes from eon just
like the pillar/letter boxing code for fullscreen stuff did.

Previously I didn't need this part of that code, but the touch
coordinates are in ndc and those need to get transformed by the
projection transform's inverse.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/sars.h b/src/sars.h
index 734e016..d5325e5 100644
--- a/src/sars.h
+++ b/src/sars.h
@@ -45,6 +45,7 @@ typedef struct sars_t {
 	sars_winmode_t	winmode;
 
 	m4f_t		projection_x;
+	m4f_t		projection_x_inv;
 } sars_t;
 
 void sars_canvas_size(sars_t *sars, int *res_width, int *res_height);
@@ -53,6 +54,8 @@ void sars_canvas_from_ndc(sars_t *sars, float x, float y, int *res_x, int *res_y
 void sars_viewport_size(sars_t *sars, int *res_width, int *res_height);
 void sars_viewport_to_ndc(sars_t *sars, int x, int y, float *res_x, float *res_y);
 void sars_viewport_from_ndc(sars_t *sars, float x, float y, int *res_x, int *res_y);
+void sars_ndc_to_bpc(sars_t *sars, float x, float y, float *res_x, float *res_y);
+void sars_viewport_to_bpc(sars_t *sars, int x, int y, float *res_x, float *res_y);
 uint32_t sars_viewport_id(sars_t *sars);
 void sars_render(play_t *play, void *context);
 void sars_dispatch(play_t *play, void *context, SDL_Event *event);