render: make wlr_renderer_clear take a float[4] for the color

examples/output-layout.c

@@ -102,7 +102,7 @@ static void handle_output_frame(struct output_state *output,
 
 	wlr_output_make_current(wlr_output, NULL);
 	wlr_renderer_begin(sample->renderer, wlr_output);
-	wlr_renderer_clear(sample->renderer, 0.25f, 0.25f, 0.25f, 1);
+	wlr_renderer_clear(sample->renderer, &(float[]){0.25f, 0.25f, 0.25f, 1});
 
 	animate_cat(sample, output->output);
 

examples/rotation.c

@@ -44,7 +44,7 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 
 	wlr_output_make_current(wlr_output, NULL);
 	wlr_renderer_begin(sample->renderer, wlr_output);
-	wlr_renderer_clear(sample->renderer, 0.25f, 0.25f, 0.25f, 1);
+	wlr_renderer_clear(sample->renderer, &(float[]){0.25f, 0.25f, 0.25f, 1});
 
 	float matrix[16];
 	for (int y = -128 + (int)odata->y_offs; y < height; y += 128) {

examples/tablet.c

@@ -44,7 +44,7 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 
 	wlr_output_make_current(wlr_output, NULL);
 	wlr_renderer_begin(sample->renderer, wlr_output);
-	wlr_renderer_clear(sample->renderer, 0.25f, 0.25f, 0.25f, 1);
+	wlr_renderer_clear(sample->renderer, &(float[]){0.25f, 0.25f, 0.25f, 1});
 
 	float matrix[16], view[16];
 	float distance = 0.8f * (1 - sample->distance);

examples/touch.c

@@ -43,7 +43,7 @@ static void handle_output_frame(struct output_state *output, struct timespec *ts
 
 	wlr_output_make_current(wlr_output, NULL);
 	wlr_renderer_begin(sample->renderer, wlr_output);
-	wlr_renderer_clear(sample->renderer, 0.25f, 0.25f, 0.25f, 1);
+	wlr_renderer_clear(sample->renderer, &(float[]){0.25f, 0.25f, 0.25f, 1});
 
 	float matrix[16];
 	struct touch_point *p;

include/wlr/render.h

@@ -13,8 +13,7 @@ struct wlr_renderer;
 
 void wlr_renderer_begin(struct wlr_renderer *r, struct wlr_output *output);
 void wlr_renderer_end(struct wlr_renderer *r);
-void wlr_renderer_clear(struct wlr_renderer *r, float red, float green,
-	float blue, float alpha);
+void wlr_renderer_clear(struct wlr_renderer *r, const float (*color)[4]);
 /**
  * Defines a scissor box. Only pixels that lie within the scissor box can be
  * modified by drawing functions. Providing a NULL `box` disables the scissor

include/wlr/render/interface.h

@@ -18,8 +18,7 @@ struct wlr_renderer {
 struct wlr_renderer_impl {
 	void (*begin)(struct wlr_renderer *renderer, struct wlr_output *output);
 	void (*end)(struct wlr_renderer *renderer);
-	void (*clear)(struct wlr_renderer *renderer, float red, float green,
-		float blue, float alpha);
+	void (*clear)(struct wlr_renderer *renderer, const float (*color)[4]);
 	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,

render/gles2/renderer.c

@@ -121,9 +121,9 @@ static void wlr_gles2_end(struct wlr_renderer *wlr_renderer) {
 	// no-op
 }
 
-static void wlr_gles2_clear(struct wlr_renderer *wlr_renderer, float red,
-		float green, float blue, float alpha) {
-	glClearColor(red, green, blue, alpha);
+static void wlr_gles2_clear(struct wlr_renderer *wlr_renderer,
+		const float (*color)[4]) {
+	glClearColor((*color)[0], (*color)[1], (*color)[2], (*color)[3]);
 	glClear(GL_COLOR_BUFFER_BIT);
 }
 

render/wlr_renderer.c

@@ -23,9 +23,8 @@ void wlr_renderer_end(struct wlr_renderer *r) {
 	r->impl->end(r);
 }
 
-void wlr_renderer_clear(struct wlr_renderer *r, float red, float green,
-		float blue, float alpha) {
-	r->impl->clear(r, red, green, blue, alpha);
+void wlr_renderer_clear(struct wlr_renderer *r, const float (*color)[4]) {
+	r->impl->clear(r, color);
 }
 
 void wlr_renderer_scissor(struct wlr_renderer *r, struct wlr_box *box) {

rootston/output.c

@@ -361,7 +361,7 @@ static void render_output(struct roots_output *output) {
 	struct timespec now;
 	clock_gettime(CLOCK_MONOTONIC, &now);
 
-	float clear_color[] = {0.25f, 0.25f, 0.25f};
+	float clear_color[] = {0.25f, 0.25f, 0.25f, 1.0f};
 
 	// Check if we can delegate the fullscreen surface to the output
 	if (output->fullscreen_view != NULL) {
@@ -438,8 +438,7 @@ static void render_output(struct roots_output *output) {
 	pixman_box32_t *rects = pixman_region32_rectangles(&damage, &nrects);
 	for (int i = 0; i < nrects; ++i) {
 		scissor_output(output, &rects[i]);
-		wlr_renderer_clear(renderer, clear_color[0], clear_color[1],
-			clear_color[2], 1);
+		wlr_renderer_clear(renderer, &clear_color);
 	}
 
 	// If a view is fullscreen on this output, render it