Add alpha to wlr_render_with_matrix

so we can use the alpha channel to e.g. blend in textures

2 files changed, 5 insertions, 4 deletions

diff --git a/include/wlr/render.h b/include/wlr/render.h
index 3743482b..747603da 100644
--- a/include/wlr/render.h
+++ b/include/wlr/render.h
@@ -33,12 +33,13 @@ struct wlr_texture *wlr_render_texture_create(struct wlr_renderer *r);
  * 	float projection[16];
  * 	float matrix[16];
  * 	wlr_texture_get_matrix(texture, &matrix, &projection, 123, 321);
- * 	wlr_render_with_matrix(renderer, texture, &matrix);
+ * 	wlr_render_with_matrix(renderer, texture, &matrix, 0.5f);
  *
- * This will render the texture at <123, 321>.
+ * This will render the texture at <123, 321> with an alpha channel of 0.5.
  */
 bool wlr_render_with_matrix(struct wlr_renderer *r,
-	struct wlr_texture *texture, const float (*matrix)[16]);
+	struct wlr_texture *texture, const float (*matrix)[16], float alpha);
+
 /**
  * Renders a solid quad in the specified color.
  */
diff --git a/include/wlr/render/interface.h b/include/wlr/render/interface.h
index b989e399..eda5af1c 100644
--- a/include/wlr/render/interface.h
+++ b/include/wlr/render/interface.h
@@ -22,7 +22,7 @@ struct wlr_renderer_impl {
 	void (*scissor)(struct wlr_renderer *renderer, struct wlr_box *box);
 	struct wlr_texture *(*texture_create)(struct wlr_renderer *renderer);
 	bool (*render_with_matrix)(struct wlr_renderer *renderer,
-		struct wlr_texture *texture, const float (*matrix)[16]);
+		struct wlr_texture *texture, const float (*matrix)[16], float alpha);
 	void (*render_quad)(struct wlr_renderer *renderer,
 		const float (*color)[4], const float (*matrix)[16]);
 	void (*render_ellipse)(struct wlr_renderer *renderer,