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render/gles2: query alpha size from render buffer

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If we're using a render buffer, query the alpha size from it.

Closes: https://github.com/swaywm/wlroots/issues/2527
This commit is contained in:
Simon Ser 2020-12-08 19:37:21 +01:00
parent be8403e73d
commit f91e89fd9f
1 changed files with 6 additions and 1 deletions
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7
render/gles2/renderer.c
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@ -453,7 +453,12 @@ static enum wl_shm_format gles2_preferred_read_format(
pop_gles2_debug(renderer); pop_gles2_debug(renderer);
EGLint alpha_size = -1; EGLint alpha_size = -1;
if (renderer->egl->config != EGL_NO_CONFIG_KHR) { if (renderer->current_buffer != NULL) {
glBindRenderbuffer(GL_RENDERBUFFER, renderer->current_buffer->rbo);
glGetRenderbufferParameteriv(GL_RENDERBUFFER,
GL_RENDERBUFFER_ALPHA_SIZE, &alpha_size);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
} else if (renderer->egl->config != EGL_NO_CONFIG_KHR) {
eglGetConfigAttrib(renderer->egl->display, renderer->egl->config, eglGetConfigAttrib(renderer->egl->display, renderer->egl->config,
EGL_ALPHA_SIZE, &alpha_size); EGL_ALPHA_SIZE, &alpha_size);
} }