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cogl/framebuffer/gl: Move most read restriction to drivers

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OpenGL requires more hand holding in the driver regarding what pixel
memory layouts can be written when calling glReadPixels(), compared to
GLES2. Lets move the details of this logic to the corresponding
backends, so in the future, the GLES2 backend can be adapted to handle
more formats, without placing that logic in the generic layer.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2461>
This commit is contained in:
Jonas Ådahl 2022-10-10 22:13:05 +02:00 committed by Marge Bot
parent 8d179c078d
commit 8e65e510d4
6 changed files with 54 additions and 20 deletions
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6
cogl/cogl/cogl-driver.h
View file

@ -70,6 +70,12 @@ struct _CoglDriverVtable
GLenum *out_glformat,
GLenum *out_gltype);
gboolean
(* read_pixels_format_supported) (CoglContext *ctx,
GLenum gl_intformat,
GLenum gl_format,
GLenum gl_type);
gboolean
(* update_features) (CoglContext *context,
GError **error);

2
cogl/cogl/cogl-private.h
View file

@ -50,7 +50,7 @@ typedef enum
COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_HALF_FLOAT,
COGL_PRIVATE_FEATURE_UNPACK_SUBIMAGE,
COGL_PRIVATE_FEATURE_SAMPLER_OBJECTS,
COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_FORMAT,
COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_STRIDE,
COGL_PRIVATE_FEATURE_FORMAT_CONVERSION,
COGL_PRIVATE_FEATURE_QUERY_FRAMEBUFFER_BITS,
COGL_PRIVATE_FEATURE_QUERY_TEXTURE_PARAMETERS,

38
cogl/cogl/driver/gl/cogl-framebuffer-gl.c
View file

@ -429,6 +429,9 @@ cogl_gl_framebuffer_read_pixels_into_bitmap (CoglFramebufferDriver *driver,
GLenum gl_format;
GLenum gl_type;
GLenum gl_pack_enum = GL_FALSE;
int bytes_per_pixel;
gboolean is_read_pixels_format_supported;
gboolean format_mismatch;
gboolean pack_invert_set;
int status = FALSE;
@ -466,21 +469,21 @@ cogl_gl_framebuffer_read_pixels_into_bitmap (CoglFramebufferDriver *driver,
else
pack_invert_set = FALSE;
/* Under GLES only GL_RGBA with GL_UNSIGNED_BYTE as well as an
implementation specific format under
GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES and
GL_IMPLEMENTATION_COLOR_READ_TYPE_OES is supported. We could try
to be more clever and check if the requested type matches that
but we would need some reliable functions to convert from GL
types to Cogl types. For now, lets just always read in
GL_RGBA/GL_UNSIGNED_BYTE and convert if necessary. We also need
to use this intermediate buffer if the rowstride has padding
because GLES does not support setting GL_ROW_LENGTH */
if ((!_cogl_has_private_feature
(ctx, COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_FORMAT) &&
(gl_format != GL_RGBA || gl_type != GL_UNSIGNED_BYTE ||
cogl_bitmap_get_rowstride (bitmap) != 4 * width)) ||
(required_format & ~COGL_PREMULT_BIT) != (format & ~COGL_PREMULT_BIT))
bytes_per_pixel = cogl_pixel_format_get_bytes_per_pixel (format, 0);
is_read_pixels_format_supported =
ctx->driver_vtable->read_pixels_format_supported (ctx,
gl_intformat,
gl_format,
gl_type);
format_mismatch =
(required_format & ~COGL_PREMULT_BIT) !=
(format & ~COGL_PREMULT_BIT);
if (!is_read_pixels_format_supported ||
format_mismatch ||
(!_cogl_has_private_feature (ctx,
COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_STRIDE) &&
cogl_bitmap_get_rowstride (bitmap) != bytes_per_pixel * width))
{
CoglBitmap *tmp_bmp;
CoglPixelFormat read_format;
@ -488,9 +491,10 @@ cogl_gl_framebuffer_read_pixels_into_bitmap (CoglFramebufferDriver *driver,
uint8_t *tmp_data;
gboolean succeeded;
if (_cogl_has_private_feature
(ctx, COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_FORMAT))
if (is_read_pixels_format_supported)
{
read_format = required_format;
}
else
{
read_format = COGL_PIXEL_FORMAT_RGBA_8888;

12
cogl/cogl/driver/gl/gl/cogl-driver-gl.c
View file

@ -354,6 +354,15 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
return required_format;
}
static gboolean
_cogl_driver_read_pixels_format_supported (CoglContext *context,
GLenum glintformat,
GLenum glformat,
GLenum gltype)
{
return TRUE;
}
static gboolean
_cogl_get_gl_version (CoglContext *ctx,
int *major_out,
@ -517,7 +526,7 @@ _cogl_driver_update_features (CoglContext *ctx,
}
COGL_FLAGS_SET (private_features,
COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_FORMAT, TRUE);
COGL_PRIVATE_FEATURE_READ_PIXELS_ANY_STRIDE, TRUE);
COGL_FLAGS_SET (private_features, COGL_PRIVATE_FEATURE_ANY_GL, TRUE);
COGL_FLAGS_SET (private_features,
COGL_PRIVATE_FEATURE_FORMAT_CONVERSION, TRUE);
@ -582,6 +591,7 @@ _cogl_driver_gl =
_cogl_gl_get_graphics_reset_status,
_cogl_driver_pixel_format_from_gl_internal,
_cogl_driver_pixel_format_to_gl,
_cogl_driver_read_pixels_format_supported,
_cogl_driver_update_features,
_cogl_driver_gl_create_framebuffer_driver,
_cogl_driver_gl_flush_framebuffer_state,

13
cogl/cogl/driver/gl/gles/cogl-driver-gles.c
View file

@ -271,6 +271,18 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
return required_format;
}
static gboolean
_cogl_driver_read_pixels_format_supported (CoglContext *context,
GLenum glintformat,
GLenum glformat,
GLenum gltype)
{
if (glformat == GL_RGBA && gltype == GL_UNSIGNED_BYTE)
return TRUE;
return FALSE;
}
static gboolean
_cogl_get_gl_version (CoglContext *ctx,
int *major_out,
@ -477,6 +489,7 @@ _cogl_driver_gles =
_cogl_gl_get_graphics_reset_status,
_cogl_driver_pixel_format_from_gl_internal,
_cogl_driver_pixel_format_to_gl,
_cogl_driver_read_pixels_format_supported,
_cogl_driver_update_features,
_cogl_driver_gl_create_framebuffer_driver,
_cogl_driver_gl_flush_framebuffer_state,

1
cogl/cogl/driver/nop/cogl-driver-nop.c
View file

@ -95,6 +95,7 @@ _cogl_driver_nop =
NULL, /* get_graphics_reset_status */
NULL, /* pixel_format_from_gl_internal */
NULL, /* pixel_format_to_gl */
NULL, /* read_pixels_format_supported */
_cogl_driver_update_features,
_cogl_driver_nop_create_framebuffer_driver,
_cogl_driver_nop_flush_framebuffer_state,