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examples/layer-shell: premultiply alpha

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This commit is contained in:
Kirill Primak 2022-05-01 16:03:44 +03:00 committed by Simon Ser
parent 12d84f8c36
commit 0326ceff90
1 changed files with 5 additions and 3 deletions
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8
examples/layer-shell.c
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@ -124,9 +124,10 @@ static void draw(void) {
glViewport(0, 0, width, height); glViewport(0, 0, width, height);
if (buttons) { if (buttons) {
glClearColor(1, 1, 1, alpha); glClearColor(alpha, alpha, alpha, alpha);
} else { } 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); 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); eglMakeCurrent(egl_display, popup_egl_surface, popup_egl_surface, egl_context);
glViewport(0, 0, popup_width, popup_height); 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; popup_alpha += alpha_mod;
if (popup_alpha < 0.01 || popup_alpha >= 1.0f) { if (popup_alpha < 0.01 || popup_alpha >= 1.0f) {
alpha_mod *= -1.0; alpha_mod *= -1.0;