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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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GPG key ID: 0FDE7BE0E88F5E48
7 changed files with 139 additions and 23 deletions
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20
render/gles2/pixel_format.c
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@ -3,9 +3,9 @@
#include "render/gles2.h"
/*
* The wayland formats are little endian while the GL formats are big endian,
* so WL_SHM_FORMAT_ARGB8888 is actually compatible with GL_BGRA_EXT.
*/
* The wayland formats are little endian while the GL formats are big endian,
* so WL_SHM_FORMAT_ARGB8888 is actually compatible with GL_BGRA_EXT.
*/
static const struct wlr_gles2_pixel_format formats[] = {
{
.wl_format = WL_SHM_FORMAT_ARGB8888,
@ -60,7 +60,19 @@ const struct wlr_gles2_pixel_format *get_gles2_format_from_wl(
return NULL;
}
const enum wl_shm_format *get_gles2_formats(size_t *len) {
const struct wlr_gles2_pixel_format *get_gles2_format_from_gl(
GLint gl_format, GLint gl_type, bool alpha) {
for (size_t i = 0; i < sizeof(formats) / sizeof(*formats); ++i) {
if (formats[i].gl_format == gl_format &&
formats[i].gl_type == gl_type &&
formats[i].has_alpha == alpha) {
return &formats[i];
}
}
return NULL;
}
const enum wl_shm_format *get_gles2_wl_formats(size_t *len) {
*len = sizeof(wl_formats) / sizeof(wl_formats[0]);
return wl_formats;
}