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cogl: Use sized internal renderable formats

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Using sized internal formats is required to make sure we actually get
the precision that we want.

The formats should also be renderable, otherwise they can not be used as
a framebuffer attachment. For GLES we have to check for a bunch of
extensions and fall back to internal formats with more bits when they
are not available.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3429>
This commit is contained in:
Sebastian Wick 2023-11-28 21:54:21 +01:00 committed by Marge Bot
parent bbf2d83e94
commit 7f943613a8
2 changed files with 236 additions and 138 deletions
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96
cogl/cogl/driver/gl/gl/cogl-driver-gl.c
View file

@ -80,6 +80,26 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
required_format = format;
/* For a pixel format to be used as a framebuffer attachment the corresponding
* GL internal format must be color-renderable.
*
* GL core 3.1
* The following base internal formats from table 3.11 are color-renderable:
* RED, RG, RGB, and RGBA. The sized internal formats from table 3.12 that
* have a color-renderable base internal format are also color-renderable. No
* other formats, including compressed internal formats, are color-renderable.
*
* All sized formats from table 3.12 have a color-renderable base internal
* format and are therefore color-renderable.
*
* Only a subset of those formats are required to be supported as
* color-renderable (3.8.1 Required Texture Formats). Notably absent from the
* required renderbuffer color formats are RGB8, RGB16F and GL_RGB10. They are
* required to be supported as texture-renderable though, so using those
* internal formats is okay but allocating a framebuffer with those formats
* might fail.
*/
/* Find GL equivalents */
switch (format)
{
@ -87,51 +107,51 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
/* The driver doesn't natively support alpha textures so we
* will use a red component texture with a swizzle to implement
* the texture */
glintformat = GL_RED;
glintformat = GL_R8;
glformat = GL_RED;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_R_8:
glintformat = GL_LUMINANCE;
glformat = GL_LUMINANCE;
glintformat = GL_R8;
glformat = GL_RED;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_RG_88:
glintformat = GL_RG;
glintformat = GL_RG8;
glformat = GL_RG;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_RGB_888:
glintformat = GL_RGB;
glintformat = GL_RGBA8;
glformat = GL_RGB;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_BGR_888:
glintformat = GL_RGB;
glintformat = GL_RGBA8;
glformat = GL_BGR;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_RGBX_8888:
glintformat = GL_RGB;
glintformat = GL_RGB8;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_RGBA_8888:
case COGL_PIXEL_FORMAT_RGBA_8888_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGBA8;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_BGRX_8888:
glintformat = GL_RGB;
glintformat = GL_RGB8;
glformat = GL_BGRA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_BGRA_8888:
case COGL_PIXEL_FORMAT_BGRA_8888_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGBA8;
glformat = GL_BGRA;
gltype = GL_UNSIGNED_BYTE;
break;
@ -140,7 +160,7 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
* have no GL equivalent unless defined using
* system word byte ordering */
case COGL_PIXEL_FORMAT_XRGB_8888:
glintformat = GL_RGB;
glintformat = GL_RGB8;
glformat = GL_BGRA;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gltype = GL_UNSIGNED_INT_8_8_8_8;
@ -150,7 +170,7 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
break;
case COGL_PIXEL_FORMAT_ARGB_8888:
case COGL_PIXEL_FORMAT_ARGB_8888_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGBA8;
glformat = GL_BGRA;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gltype = GL_UNSIGNED_INT_8_8_8_8;
@ -160,7 +180,7 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
break;
case COGL_PIXEL_FORMAT_XBGR_8888:
glintformat = GL_RGB;
glintformat = GL_RGB8;
glformat = GL_RGBA;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gltype = GL_UNSIGNED_INT_8_8_8_8;
@ -170,7 +190,7 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
break;
case COGL_PIXEL_FORMAT_ABGR_8888:
case COGL_PIXEL_FORMAT_ABGR_8888_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGBA8;
glformat = GL_RGBA;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gltype = GL_UNSIGNED_INT_8_8_8_8;
@ -181,38 +201,38 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
case COGL_PIXEL_FORMAT_RGBA_1010102:
case COGL_PIXEL_FORMAT_RGBA_1010102_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGB10_A2;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_INT_10_10_10_2;
break;
case COGL_PIXEL_FORMAT_BGRA_1010102:
case COGL_PIXEL_FORMAT_BGRA_1010102_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGB10_A2;
glformat = GL_BGRA;
gltype = GL_UNSIGNED_INT_10_10_10_2;
break;
case COGL_PIXEL_FORMAT_XBGR_2101010:
glintformat = GL_RGB;
glintformat = GL_RGB10;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_INT_2_10_10_10_REV;
break;
case COGL_PIXEL_FORMAT_ABGR_2101010:
case COGL_PIXEL_FORMAT_ABGR_2101010_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGB10_A2;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_INT_2_10_10_10_REV;
break;
case COGL_PIXEL_FORMAT_XRGB_2101010:
glintformat = GL_RGB;
glintformat = GL_RGB10;
glformat = GL_BGRA;
gltype = GL_UNSIGNED_INT_2_10_10_10_REV;
break;
case COGL_PIXEL_FORMAT_ARGB_2101010:
case COGL_PIXEL_FORMAT_ARGB_2101010_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGB10_A2;
glformat = GL_BGRA;
gltype = GL_UNSIGNED_INT_2_10_10_10_REV;
break;
@ -227,60 +247,52 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
break;
case COGL_PIXEL_FORMAT_RGBA_4444:
case COGL_PIXEL_FORMAT_RGBA_4444_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGBA4;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case COGL_PIXEL_FORMAT_RGBA_5551:
case COGL_PIXEL_FORMAT_RGBA_5551_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGB5_A1;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_5_5_5_1;
break;
case COGL_PIXEL_FORMAT_RGBX_FP_16161616:
glintformat = GL_RGB;
glintformat = GL_RGB16F;
glformat = GL_RGBA;
gltype = GL_HALF_FLOAT;
break;
case COGL_PIXEL_FORMAT_RGBA_FP_16161616:
case COGL_PIXEL_FORMAT_RGBA_FP_16161616_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGBA16F;
glformat = GL_RGBA;
gltype = GL_HALF_FLOAT;
break;
case COGL_PIXEL_FORMAT_BGRX_FP_16161616:
glintformat = GL_RGB;
glintformat = GL_RGB16F;
glformat = GL_BGRA;
gltype = GL_HALF_FLOAT;
break;
case COGL_PIXEL_FORMAT_BGRA_FP_16161616:
case COGL_PIXEL_FORMAT_BGRA_FP_16161616_PRE:
glintformat = GL_RGBA;
glintformat = GL_RGBA16F;
glformat = GL_BGRA;
gltype = GL_HALF_FLOAT;
break;
case COGL_PIXEL_FORMAT_XRGB_FP_16161616:
glintformat = GL_RGB;
glformat = GL_BGRA;
gltype = GL_HALF_FLOAT;
break;
case COGL_PIXEL_FORMAT_ARGB_FP_16161616:
case COGL_PIXEL_FORMAT_ARGB_FP_16161616_PRE:
glintformat = GL_RGBA;
glformat = GL_BGRA;
gltype = GL_HALF_FLOAT;
break;
case COGL_PIXEL_FORMAT_XBGR_FP_16161616:
glintformat = GL_RGB;
glformat = GL_RGBA;
gltype = GL_HALF_FLOAT;
break;
case COGL_PIXEL_FORMAT_ABGR_FP_16161616:
case COGL_PIXEL_FORMAT_ABGR_FP_16161616_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_HALF_FLOAT;
required_format =
_cogl_driver_pixel_format_to_gl (context,
COGL_PIXEL_FORMAT_RGBA_FP_16161616 |
(format & COGL_PREMULT_BIT),
&glintformat,
&glformat,
&gltype);
break;
case COGL_PIXEL_FORMAT_DEPTH_16:
@ -290,7 +302,7 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
break;
case COGL_PIXEL_FORMAT_DEPTH_24_STENCIL_8:
glintformat = GL_DEPTH_STENCIL;
glintformat = GL_DEPTH24_STENCIL8;
glformat = GL_DEPTH_STENCIL;
gltype = GL_UNSIGNED_INT_24_8;
break;

276
cogl/cogl/driver/gl/gles/cogl-driver-gles.c
View file

@ -53,14 +53,26 @@
#ifndef GL_RG
#define GL_RG 0x8227
#endif
#ifndef GL_RG8
#define GL_RG8 0x822B
#ifndef GL_RGB8
#define GL_RGB8 0x8051
#endif
#ifndef GL_UNSIGNED_INT_2_10_10_10_REV_EXT
#define GL_UNSIGNED_INT_2_10_10_10_REV_EXT 0x8368
#ifndef GL_RGBA8
#define GL_RGBA8 0x8058
#endif
#ifndef GL_HALF_FLOAT_OES
#define GL_HALF_FLOAT_OES 0x8D61
#ifndef GL_RGB10_A2
#define GL_RGB10_A2 0x8059
#endif
#ifndef GL_UNSIGNED_INT_2_10_10_10_REV
#define GL_UNSIGNED_INT_2_10_10_10_REV 0x8368
#endif
#ifndef GL_RGBA16F
#define GL_RGBA16F 0x881A
#endif
#ifndef GL_HALF_FLOAT
#define GL_HALF_FLOAT 0x140B
#endif
#ifndef GL_UNSIGNED_INT_2_10_10_10_REV
#define GL_UNSIGNED_INT_2_10_10_10_REV 0x8368
#endif
static CoglPixelFormat
@ -77,6 +89,49 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
required_format = format;
/* For a pixel format to be used as a framebuffer attachment the corresponding
* GL internal format must be color-renderable.
*
* GLES 3.0:
* An internal format is color-renderable if it is one of the formats from ta-
* ble 3.13 noted as color-renderable or if it is unsized format RGBA or RGB
*
* Sized formats from table 3.13:
* R8, RG8, RGB8, RGB565, RGBA4, RGB5_A1, RGBA8, RGB10_A2, RGB10_A2UI,
* SRGB8_ALPHA8, R8I, R8UI, R16I, R16UI, R32I, R32UI, RG8I, RG8UI, RG16I,
* RG16UI, RG32I, RG32UI, RGBA8I, RGBA8UI, RGBA16I, RGBA16UI, RGBA32I,
* RGBA32UI
*
* GLES 2.0:
* Formats not listed in table 4.5, including compressed internal formats. are
* not color-, depth-, or stencil-renderable, no matter which components they
* contain.
*
* Sized formats from table 4.5:
* RGBA4, RGB5_A1, RGB565
*
* More color-renderable formats from extensions:
*
* OES_rgb8_rgba8
* adds RGB8, RGBA8 as color-renderable internal formats
*
* EXT_texture_format_BGRA8888
* adds BGRA_EXT as internal and external color-renderable format
*
* EXT_color_buffer_half_float (requires OES_texture_half_float)
* adds R16F, RG16F (required EXT_texture_rg) and RGB16F, RGBA16F
* as internal color-renderable formats
*
* => We require GLES 2 + OES_rgb8_rgba8 or GLES 3 which gives us at least:
* RGB8, RGBA8, RGBA4, RGB5_A1, RGB565
*/
/* We try to use the exact matching GL format but if that's not possible
* because the driver doesn't support it, we fall back to the next best match
* by calling this function again. This works for all formats which are
* <= 8 bpc with any R, G, B, A channels because we require RGBA8888.
*/
/* Find GL equivalents */
switch (format)
{
@ -85,6 +140,7 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
glformat = GL_ALPHA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_R_8:
glintformat = GL_LUMINANCE;
glformat = GL_LUMINANCE;
@ -94,45 +150,109 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
case COGL_PIXEL_FORMAT_RG_88:
if (cogl_has_feature (context, COGL_FEATURE_ID_TEXTURE_RG))
{
glintformat = GL_RG8;
glintformat = GL_RG8_EXT;
glformat = GL_RG;
gltype = GL_UNSIGNED_BYTE;
}
else
{
/* If red-green textures aren't supported then we'll use RGB
* as an internal format. Note this should only end up
* mattering for downloading the data because Cogl will
* refuse to allocate a texture with RG components if RG
* textures aren't supported */
glintformat = GL_RGB;
glformat = GL_RGB;
required_format = COGL_PIXEL_FORMAT_RGB_888;
required_format =
_cogl_driver_pixel_format_to_gl (context,
COGL_PIXEL_FORMAT_RGB_888,
&glintformat,
&glformat,
&gltype);
}
break;
case COGL_PIXEL_FORMAT_RGB_888:
glintformat = GL_RGB8;
glformat = GL_RGB;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_BGR_888:
required_format =
_cogl_driver_pixel_format_to_gl (context,
COGL_PIXEL_FORMAT_RGB_888,
&glintformat,
&glformat,
&gltype);
break;
case COGL_PIXEL_FORMAT_BGRA_8888:
case COGL_PIXEL_FORMAT_BGRA_8888_PRE:
/* There is an extension to support this format */
if (_cogl_has_private_feature
(context, COGL_PRIVATE_FEATURE_TEXTURE_FORMAT_BGRA8888))
{
/* For some reason the extension says you have to specify
BGRA for the internal format too */
glintformat = GL_BGRA_EXT;
glformat = GL_BGRA_EXT;
gltype = GL_UNSIGNED_BYTE;
required_format = format;
break;
}
G_GNUC_FALLTHROUGH;
/* Just one 24-bit ordering supported */
case COGL_PIXEL_FORMAT_RGB_888:
case COGL_PIXEL_FORMAT_BGR_888:
glintformat = GL_RGB;
glformat = GL_RGB;
else
{
required_format =
_cogl_driver_pixel_format_to_gl (context,
COGL_PIXEL_FORMAT_RGBA_8888,
&glintformat,
&glformat,
&gltype);
}
break;
case COGL_PIXEL_FORMAT_BGRX_8888:
case COGL_PIXEL_FORMAT_RGBX_8888:
case COGL_PIXEL_FORMAT_XRGB_8888:
case COGL_PIXEL_FORMAT_XBGR_8888:
required_format =
_cogl_driver_pixel_format_to_gl (context,
COGL_PIXEL_FORMAT_RGBA_8888_PRE,
&glintformat,
&glformat,
&gltype);
break;
case COGL_PIXEL_FORMAT_ARGB_8888:
case COGL_PIXEL_FORMAT_ARGB_8888_PRE:
case COGL_PIXEL_FORMAT_ABGR_8888:
case COGL_PIXEL_FORMAT_ABGR_8888_PRE:
required_format =
_cogl_driver_pixel_format_to_gl (context,
COGL_PIXEL_FORMAT_RGBA_8888 |
(format & COGL_PREMULT_BIT),
&glintformat,
&glformat,
&gltype);
break;
case COGL_PIXEL_FORMAT_RGBA_8888:
case COGL_PIXEL_FORMAT_RGBA_8888_PRE:
glintformat = GL_RGBA8;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
required_format = COGL_PIXEL_FORMAT_RGB_888;
break;
/* The following three types of channel ordering
* are always defined using system word byte
* ordering (even according to GLES spec) */
case COGL_PIXEL_FORMAT_RGB_565:
glintformat = GL_RGB565;
glformat = GL_RGB;
gltype = GL_UNSIGNED_SHORT_5_6_5;
break;
case COGL_PIXEL_FORMAT_RGBA_4444:
case COGL_PIXEL_FORMAT_RGBA_4444_PRE:
glintformat = GL_RGBA4;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case COGL_PIXEL_FORMAT_RGBA_5551:
case COGL_PIXEL_FORMAT_RGBA_5551_PRE:
glintformat = GL_RGB5_A1;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_5_5_5_1;
break;
case COGL_PIXEL_FORMAT_ABGR_2101010:
@ -140,13 +260,18 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
if (cogl_has_feature (context, COGL_FEATURE_ID_TEXTURE_RGBA1010102))
{
glintformat = GL_RGB10_A2_EXT;
glintformat = GL_RGB10_A2;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_INT_2_10_10_10_REV_EXT;
gltype = GL_UNSIGNED_INT_2_10_10_10_REV;
break;
}
G_GNUC_FALLTHROUGH;
else
#endif
{
g_assert_not_reached ();
}
break;
case COGL_PIXEL_FORMAT_RGBA_1010102:
case COGL_PIXEL_FORMAT_RGBA_1010102_PRE:
case COGL_PIXEL_FORMAT_BGRA_1010102:
@ -155,62 +280,28 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
case COGL_PIXEL_FORMAT_XRGB_2101010:
case COGL_PIXEL_FORMAT_ARGB_2101010:
case COGL_PIXEL_FORMAT_ARGB_2101010_PRE:
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
if (cogl_has_feature (context, COGL_FEATURE_ID_TEXTURE_RGBA1010102))
required_format =
_cogl_driver_pixel_format_to_gl (context,
COGL_PIXEL_FORMAT_ABGR_2101010 |
(format & COGL_PREMULT_BIT),
&glintformat,
&glformat,
&gltype);
break;
case COGL_PIXEL_FORMAT_RGBX_FP_16161616:
case COGL_PIXEL_FORMAT_RGBA_FP_16161616:
case COGL_PIXEL_FORMAT_RGBA_FP_16161616_PRE:
if (cogl_has_feature (context, COGL_FEATURE_ID_TEXTURE_HALF_FLOAT))
{
glintformat = GL_RGB10_A2_EXT;
glintformat = GL_RGBA16F;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_INT_2_10_10_10_REV_EXT;
required_format = COGL_PIXEL_FORMAT_ABGR_2101010;
required_format |= (format & COGL_PREMULT_BIT);
break;
gltype = GL_HALF_FLOAT;
}
else
{
g_assert_not_reached ();
}
#endif
G_GNUC_FALLTHROUGH;
case COGL_PIXEL_FORMAT_BGRX_8888:
case COGL_PIXEL_FORMAT_RGBX_8888:
case COGL_PIXEL_FORMAT_XRGB_8888:
case COGL_PIXEL_FORMAT_XBGR_8888:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
required_format = COGL_PIXEL_FORMAT_RGBA_8888_PRE;
break;
case COGL_PIXEL_FORMAT_RGBA_8888:
case COGL_PIXEL_FORMAT_RGBA_8888_PRE:
case COGL_PIXEL_FORMAT_ARGB_8888:
case COGL_PIXEL_FORMAT_ARGB_8888_PRE:
case COGL_PIXEL_FORMAT_ABGR_8888:
case COGL_PIXEL_FORMAT_ABGR_8888_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
required_format = COGL_PIXEL_FORMAT_RGBA_8888;
required_format |= (format & COGL_PREMULT_BIT);
break;
/* The following three types of channel ordering
* are always defined using system word byte
* ordering (even according to GLES spec) */
case COGL_PIXEL_FORMAT_RGB_565:
glintformat = GL_RGB;
glformat = GL_RGB;
gltype = GL_UNSIGNED_SHORT_5_6_5;
break;
case COGL_PIXEL_FORMAT_RGBA_4444:
case COGL_PIXEL_FORMAT_RGBA_4444_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case COGL_PIXEL_FORMAT_RGBA_5551:
case COGL_PIXEL_FORMAT_RGBA_5551_PRE:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_5_5_5_1;
break;
case COGL_PIXEL_FORMAT_BGRX_FP_16161616:
@ -222,18 +313,13 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
case COGL_PIXEL_FORMAT_BGRA_FP_16161616_PRE:
case COGL_PIXEL_FORMAT_ARGB_FP_16161616_PRE:
case COGL_PIXEL_FORMAT_ABGR_FP_16161616_PRE:
g_warning ("Unhandled 16 bpc pixel format used");
G_GNUC_FALLTHROUGH;
case COGL_PIXEL_FORMAT_RGBX_FP_16161616:
case COGL_PIXEL_FORMAT_RGBA_FP_16161616:
case COGL_PIXEL_FORMAT_RGBA_FP_16161616_PRE:
if (cogl_has_feature (context, COGL_FEATURE_ID_TEXTURE_HALF_FLOAT))
g_warning ("Missing 16 bpc half float extension");
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_HALF_FLOAT_OES;
required_format =
_cogl_driver_pixel_format_to_gl (context,
COGL_PIXEL_FORMAT_RGBA_FP_16161616 |
(format & COGL_PREMULT_BIT),
&glintformat,
&glformat,
&gltype);
break;
case COGL_PIXEL_FORMAT_DEPTH_16: