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examples/layer-shell: premultiply alpha
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1 changed files with 5 additions and 3 deletions
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@ -124,9 +124,10 @@ static void draw(void) {
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glViewport(0, 0, width, height);
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if (buttons) {
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glClearColor(1, 1, 1, alpha);
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glClearColor(alpha, alpha, alpha, alpha);
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} else {
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glClearColor(demo.color[0], demo.color[1], demo.color[2], alpha);
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glClearColor(demo.color[0] * alpha, demo.color[1] * alpha,
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demo.color[2] * alpha, alpha);
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}
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glClear(GL_COLOR_BUFFER_BIT);
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@ -151,7 +152,8 @@ static void draw_popup(void) {
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eglMakeCurrent(egl_display, popup_egl_surface, popup_egl_surface, egl_context);
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glViewport(0, 0, popup_width, popup_height);
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glClearColor(popup_red, 0.5f, 0.5f, popup_alpha);
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glClearColor(popup_red * popup_alpha, 0.5f * popup_alpha,
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0.5f * popup_alpha, popup_alpha);
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popup_alpha += alpha_mod;
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if (popup_alpha < 0.01 || popup_alpha >= 1.0f) {
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alpha_mod *= -1.0;
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