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render/gles2: remove assumptions about supported formats

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We were assuming GL_BGRA_EXT was always supported.

We now check that it's supported for rendering. We fail if it isn't because
this format is specified as "always supported" by the Wayland protocol.

We also check if it's supported for reading pixels. A new preferred_read_format
function returns the preferred format that can be used to read pixels. This is
used by the screencopy protocol.
This commit is contained in:
emersion 2018-10-31 17:20:27 +01:00
parent 675cf8457e
commit 62d646f2b8
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7 changed files with 139 additions and 23 deletions
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5
include/wlr/render/wlr_renderer.h
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@ -96,6 +96,11 @@ int wlr_renderer_get_dmabuf_formats(struct wlr_renderer *renderer,
*/
int wlr_renderer_get_dmabuf_modifiers(struct wlr_renderer *renderer, int format,
uint64_t **modifiers);
/**
* Get the preferred format for reading pixels.
*/
bool wlr_renderer_preferred_read_format(struct wlr_renderer *renderer,
enum wl_shm_format *fmt);
/**
* Reads out of pixels of the currently bound surface into data. `stride` is in
* bytes.