From 0326ceff903660809385e5d46e9239a4d98d9495 Mon Sep 17 00:00:00 2001 From: Kirill Primak Date: Sun, 1 May 2022 16:03:44 +0300 Subject: examples/layer-shell: premultiply alpha --- examples/layer-shell.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'examples/layer-shell.c') diff --git a/examples/layer-shell.c b/examples/layer-shell.c index 56a8d4aa..f2e0aaa7 100644 --- a/examples/layer-shell.c +++ b/examples/layer-shell.c @@ -124,9 +124,10 @@ static void draw(void) { glViewport(0, 0, width, height); if (buttons) { - glClearColor(1, 1, 1, alpha); + glClearColor(alpha, alpha, alpha, alpha); } else { - glClearColor(demo.color[0], demo.color[1], demo.color[2], alpha); + glClearColor(demo.color[0] * alpha, demo.color[1] * alpha, + demo.color[2] * alpha, alpha); } glClear(GL_COLOR_BUFFER_BIT); @@ -151,7 +152,8 @@ static void draw_popup(void) { eglMakeCurrent(egl_display, popup_egl_surface, popup_egl_surface, egl_context); glViewport(0, 0, popup_width, popup_height); - glClearColor(popup_red, 0.5f, 0.5f, popup_alpha); + glClearColor(popup_red * popup_alpha, 0.5f * popup_alpha, + 0.5f * popup_alpha, popup_alpha); popup_alpha += alpha_mod; if (popup_alpha < 0.01 || popup_alpha >= 1.0f) { alpha_mod *= -1.0; -- cgit v1.2.3