libstage: add pass-thru pointer to stage_render()

It's common to need access to some rendering context from the
per-stage render functions, this simply plumbs an opaque pointer
from stage_render() down to the render functions.

2 files changed, 7 insertions, 7 deletions

diff --git a/src/stage.c b/src/stage.c
index a2c6e2d..44a0378 100644
--- a/src/stage.c
+++ b/src/stage.c
@@ -254,14 +254,14 @@ void stage_clear(stage_t *stage)
 }
 
 
-static void _render_stage(const stage_t *stage, float alpha)
+static void _render_stage(const stage_t *stage, float alpha, void *render_ctxt)
 {
 	float	a = alpha * stage->alpha;
 
 	assert(stage);
 
 	if (stage->render)
-		stage->render(stage, stage->object, a);
+		stage->render(stage, stage->object, a, render_ctxt);
 
 	for (int i = 0; i < STAGE_LAYERS_MAX; i++) {
 		stage_t	*s;
@@ -270,21 +270,21 @@ static void _render_stage(const stage_t *stage, float alpha)
 			if (!s->active)
 				continue;
 
-			_render_stage(s, a);
+			_render_stage(s, a, render_ctxt);
 		}
 	}
 }
 
 
 /* recursively render the supplied stage tree, skipping inactive branches */
-void stage_render(const stage_t *stage)
+void stage_render(const stage_t *stage, void *render_ctxt)
 {
 	assert(stage);
 
 	if (!stage->active)
 		return;
 
-	_render_stage(stage, 1.f);
+	_render_stage(stage, 1.f, render_ctxt);
 }
 
 
diff --git a/src/stage.h b/src/stage.h
index 31f134a..5416af6 100644
--- a/src/stage.h
+++ b/src/stage.h
@@ -22,14 +22,14 @@
 
 typedef struct stage_t stage_t;
 
-typedef void (stage_render_func_t)(const stage_t *stage, void *object, float alpha);
+typedef void (stage_render_func_t)(const stage_t *stage, void *object, float alpha, void *render_ctxt);
 typedef void (stage_free_func_t)(const stage_t *stage, void *object);
 typedef int (stage_match_func_t)(const stage_t *stage, void *object, void *key);
 
 stage_t * stage_new(stage_t *parent, int layer, const char *name, void *object, stage_render_func_t *render_func, stage_free_func_t *free_func, stage_match_func_t *match_func);
 void stage_replace(stage_t *stage, const char *name, void *object, stage_render_func_t *render_func, stage_free_func_t *free_func, stage_match_func_t *match_func);
 stage_t * stage_free(stage_t *stage);
-void stage_render(const stage_t *stage);
+void stage_render(const stage_t *stage, void *render_ctxt);
 void stage_clear(stage_t *stage);
 void stage_set_object(stage_t *stage, void *object);
 void * stage_get_object(const stage_t *stage);