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render/gles2: produce 16f screencopy data

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This commit introduces fairly awkward code to work around that
fact that the GL ES implementation is allowed to provide either
of the two distinct constants GL_HALF_FLOAT and GL_HALF_FLOAT_OES
as the gl_type to use when reading data from a render buffer
created from a DMABUF with half-float channels.

The 'GLES3/gl3.h' header is also provided by the pkg-config library
confusingly called 'glesv2', so no build changes are necessary.
This commit is contained in:
Manuel Stoeckl 2022-07-20 19:57:48 -04:00
parent 1b6fac4aa6
commit 1ff7bbb0d3
2 changed files with 31 additions and 3 deletions
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23
render/gles2/renderer.c
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@ -467,6 +467,23 @@ static bool gles2_read_pixels(struct wlr_renderer *wlr_renderer,
push_gles2_debug(renderer);
// The 16F buffer formats have more than one possible color read
// format/type combination; the type can be GL_HALF_FLOAT = 0x140b,
// if the GLES implementation version is >= 3.0, or could be
// GL_HALF_FLOAT_OES (which would be appropriate at GLES 2.0.)
// To match glReadPixels' strict requirements on format+type,
// we submit exactly the implementation suggested format and type,
// if these are compatible with the drm_format.
GLint gl_format = -1, gl_type = -1;
glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_FORMAT, &gl_format);
glGetIntegerv(GL_IMPLEMENTATION_COLOR_READ_TYPE, &gl_type);
const struct wlr_gles2_pixel_format *impl_format =
get_gles2_format_from_gl(gl_format, gl_type, fmt->has_alpha);
if (impl_format != fmt) {
gl_format = fmt->gl_format;
gl_type = fmt->gl_type;
}
// Make sure any pending drawing is finished before we try to read it
glFinish();
@ -478,14 +495,14 @@ static bool gles2_read_pixels(struct wlr_renderer *wlr_renderer,
// Under these particular conditions, we can read the pixels with only
// one glReadPixels call
glReadPixels(src_x, src_y, width, height, fmt->gl_format, fmt->gl_type, p);
glReadPixels(src_x, src_y, width, height, gl_format, gl_type, p);
} else {
// Unfortunately GLES2 doesn't support GL_PACK_*, so we have to read
// the lines out row by row
for (size_t i = 0; i < height; ++i) {
uint32_t y = src_y + i;
glReadPixels(src_x, y, width, 1, fmt->gl_format,
fmt->gl_type, p + i * stride + dst_x * drm_fmt->bpp / 8);
glReadPixels(src_x, y, width, 1, gl_format,
gl_type, p + i * stride + dst_x * drm_fmt->bpp / 8);
}
}