[Cogl] [PATCH] Add support for RG textures
Neil Roberts
neil at linux.intel.com
Tue Jan 14 07:52:45 PST 2014
This adds COGL_PIXEL_FORMAT_RG_88 and COGL_TEXTURE_COMPONENTS_RG in
order to support two-component textures. The RG components for a
texture is only supported if COGL_FEATURE_ID_TEXTURE_RG is advertised.
This is only available on GL 3, GL 2 with the GL_ARB_texture_rg
extension or GLES with the GL_EXT_texture_rg extension. The RG pixel
format is always supported for images because Cogl can easily do the
conversion if an application uses this format to upload to a texture
with a different format.
If an application tries to create an RG texture when the feature isn't
supported then it will raise an error when the texture is allocated.
---
cogl/cogl-bitmap-conversion.c | 40 ++++++++++++----
cogl/cogl-bitmap-packing.h | 36 +++++++++++++++
cogl/cogl-context.h | 1 +
cogl/cogl-texture.c | 15 ++++++
cogl/cogl-texture.h | 1 +
cogl/cogl-types.h | 3 ++
cogl/driver/gl/gl/cogl-driver-gl.c | 30 ++++++++++++
cogl/driver/gl/gles/cogl-driver-gles.c | 31 +++++++++++++
test-fixtures/test-utils.c | 6 +++
test-fixtures/test-utils.h | 15 +++---
tests/conform/Makefile.am | 1 +
tests/conform/test-conform-main.c | 2 +
tests/conform/test-read-texture-formats.c | 22 +++++++++
tests/conform/test-texture-rg.c | 74 ++++++++++++++++++++++++++++++
tests/conform/test-write-texture-formats.c | 5 ++
15 files changed, 266 insertions(+), 16 deletions(-)
create mode 100644 tests/conform/test-texture-rg.c
diff --git a/cogl/cogl-bitmap-conversion.c b/cogl/cogl-bitmap-conversion.c
index d2527b4..32ca75a 100644
--- a/cogl/cogl-bitmap-conversion.c
+++ b/cogl/cogl-bitmap-conversion.c
@@ -318,6 +318,7 @@ _cogl_bitmap_needs_short_temp_buffer (CoglPixelFormat format)
g_assert_not_reached ();
case COGL_PIXEL_FORMAT_A_8:
+ case COGL_PIXEL_FORMAT_RG_88:
case COGL_PIXEL_FORMAT_RGB_565:
case COGL_PIXEL_FORMAT_RGBA_4444:
case COGL_PIXEL_FORMAT_RGBA_5551:
@@ -505,6 +506,35 @@ _cogl_bitmap_convert (CoglBitmap *src_bmp,
return dst_bmp;
}
+static CoglBool
+driver_can_convert (CoglContext *ctx,
+ CoglPixelFormat src_format,
+ CoglPixelFormat internal_format)
+{
+ if (!_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_FORMAT_CONVERSION))
+ return FALSE;
+
+ if (src_format == internal_format)
+ return TRUE;
+
+ /* If the driver doesn't natively support alpha textures then it
+ * won't work correctly to convert to/from component-alpha
+ * textures */
+ if (!_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_ALPHA_TEXTURES) &&
+ (src_format == COGL_PIXEL_FORMAT_A_8 ||
+ internal_format == COGL_PIXEL_FORMAT_A_8))
+ return FALSE;
+
+ /* Same for red-green textures. If red-green textures aren't
+ * supported then the internal format should never be RG_88 but we
+ * should still be able to convert from an RG source image */
+ if (!cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_RG) &&
+ src_format == COGL_PIXEL_FORMAT_RG_88)
+ return FALSE;
+
+ return TRUE;
+}
+
CoglBitmap *
_cogl_bitmap_convert_for_upload (CoglBitmap *src_bmp,
CoglPixelFormat internal_format,
@@ -525,15 +555,7 @@ _cogl_bitmap_convert_for_upload (CoglBitmap *src_bmp,
limited number of formats so we must convert using the Cogl
bitmap code instead */
- /* If the driver doesn't natively support alpha textures then it
- * won't work correctly to convert to/from component-alpha
- * textures */
-
- if (_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_FORMAT_CONVERSION) &&
- (_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_ALPHA_TEXTURES) ||
- (src_format != COGL_PIXEL_FORMAT_A_8 &&
- internal_format != COGL_PIXEL_FORMAT_A_8) ||
- src_format == internal_format))
+ if (driver_can_convert (ctx, src_format, internal_format))
{
/* If the source format does not have the same premult flag as the
internal_format then we need to copy and convert it */
diff --git a/cogl/cogl-bitmap-packing.h b/cogl/cogl-bitmap-packing.h
index 47a36b9..b1ea84a 100644
--- a/cogl/cogl-bitmap-packing.h
+++ b/cogl/cogl-bitmap-packing.h
@@ -58,6 +58,22 @@ G_PASTE (_cogl_unpack_a_8_, component_size) (const uint8_t *src,
}
inline static void
+G_PASTE (_cogl_unpack_rg_88_, component_size) (const uint8_t *src,
+ component_type *dst,
+ int width)
+{
+ while (width-- > 0)
+ {
+ dst[0] = UNPACK_BYTE (src[0]);
+ dst[1] = UNPACK_BYTE (src[1]);
+ dst[2] = 0;
+ dst[3] = UNPACK_BYTE (255);
+ dst += 4;
+ src += 2;
+ }
+}
+
+inline static void
G_PASTE (_cogl_unpack_rgb_888_, component_size) (const uint8_t *src,
component_type *dst,
int width)
@@ -297,6 +313,9 @@ G_PASTE (_cogl_unpack_, component_size) (CoglPixelFormat format,
case COGL_PIXEL_FORMAT_A_8:
G_PASTE (_cogl_unpack_a_8_, component_size) (src, dst, width);
break;
+ case COGL_PIXEL_FORMAT_RG_88:
+ G_PASTE (_cogl_unpack_rg_88_, component_size) (src, dst, width);
+ break;
case COGL_PIXEL_FORMAT_RGB_888:
G_PASTE (_cogl_unpack_rgb_888_, component_size) (src, dst, width);
break;
@@ -382,6 +401,20 @@ G_PASTE (_cogl_pack_a_8_, component_size) (const component_type *src,
}
inline static void
+G_PASTE (_cogl_pack_rg_88_, component_size) (const component_type *src,
+ uint8_t *dst,
+ int width)
+{
+ while (width-- > 0)
+ {
+ dst[0] = PACK_BYTE (src[0]);
+ dst[1] = PACK_BYTE (src[1]);
+ src += 4;
+ dst += 2;
+ }
+}
+
+inline static void
G_PASTE (_cogl_pack_rgb_888_, component_size) (const component_type *src,
uint8_t *dst,
int width)
@@ -619,6 +652,9 @@ G_PASTE (_cogl_pack_, component_size) (CoglPixelFormat format,
case COGL_PIXEL_FORMAT_A_8:
G_PASTE (_cogl_pack_a_8_, component_size) (src, dst, width);
break;
+ case COGL_PIXEL_FORMAT_RG_88:
+ G_PASTE (_cogl_pack_rg_88_, component_size) (src, dst, width);
+ break;
case COGL_PIXEL_FORMAT_RGB_888:
G_PASTE (_cogl_pack_rgb_888_, component_size) (src, dst, width);
break;
diff --git a/cogl/cogl-context.h b/cogl/cogl-context.h
index 8b3185a..97cba0e 100644
--- a/cogl/cogl-context.h
+++ b/cogl/cogl-context.h
@@ -253,6 +253,7 @@ typedef enum _CoglFeatureID
COGL_FEATURE_ID_PRESENTATION_TIME,
COGL_FEATURE_ID_FENCE,
COGL_FEATURE_ID_PER_VERTEX_POINT_SIZE,
+ COGL_FEATURE_ID_TEXTURE_RG,
/*< private >*/
_COGL_N_FEATURE_IDS /*< skip >*/
diff --git a/cogl/cogl-texture.c b/cogl/cogl-texture.c
index dfaac45..92744f2 100644
--- a/cogl/cogl-texture.c
+++ b/cogl/cogl-texture.c
@@ -1284,6 +1284,14 @@ cogl_texture_allocate (CoglTexture *texture,
if (texture->allocated)
return TRUE;
+ if (texture->components == COGL_TEXTURE_COMPONENTS_RG &&
+ !cogl_has_feature (texture->context, COGL_FEATURE_ID_TEXTURE_RG))
+ _cogl_set_error (error,
+ COGL_TEXTURE_ERROR,
+ COGL_TEXTURE_ERROR_FORMAT,
+ "A red-green texture was requested but the driver "
+ "does not support them");
+
texture->allocated = texture->vtable->allocate (texture, error);
return texture->allocated;
@@ -1303,6 +1311,11 @@ _cogl_texture_set_internal_format (CoglTexture *texture,
texture->components = COGL_TEXTURE_COMPONENTS_A;
return;
}
+ else if (internal_format == COGL_PIXEL_FORMAT_RG_88)
+ {
+ texture->components = COGL_TEXTURE_COMPONENTS_RG;
+ return;
+ }
else if (internal_format & COGL_DEPTH_BIT)
{
texture->components = COGL_TEXTURE_COMPONENTS_DEPTH;
@@ -1344,6 +1357,8 @@ _cogl_texture_determine_internal_format (CoglTexture *texture,
}
case COGL_TEXTURE_COMPONENTS_A:
return COGL_PIXEL_FORMAT_A_8;
+ case COGL_TEXTURE_COMPONENTS_RG:
+ return COGL_PIXEL_FORMAT_RG_88;
case COGL_TEXTURE_COMPONENTS_RGB:
if (src_format != COGL_PIXEL_FORMAT_ANY &&
!(src_format & COGL_A_BIT) && !(src_format & COGL_DEPTH_BIT))
diff --git a/cogl/cogl-texture.h b/cogl/cogl-texture.h
index dcdc249..b42ff6a 100644
--- a/cogl/cogl-texture.h
+++ b/cogl/cogl-texture.h
@@ -127,6 +127,7 @@ cogl_is_texture (void *object);
typedef enum _CoglTextureComponents
{
COGL_TEXTURE_COMPONENTS_A = 1,
+ COGL_TEXTURE_COMPONENTS_RG,
COGL_TEXTURE_COMPONENTS_RGB,
COGL_TEXTURE_COMPONENTS_RGBA,
COGL_TEXTURE_COMPONENTS_DEPTH
diff --git a/cogl/cogl-types.h b/cogl/cogl-types.h
index 384ba96..677e75d 100644
--- a/cogl/cogl-types.h
+++ b/cogl/cogl-types.h
@@ -265,6 +265,7 @@ typedef struct _CoglColor CoglColor;
* CoglPixelFormat:
* @COGL_PIXEL_FORMAT_ANY: Any format
* @COGL_PIXEL_FORMAT_A_8: 8 bits alpha mask
+ * @COGL_PIXEL_FORMAT_RG_88: RG, 16 bits
* @COGL_PIXEL_FORMAT_RGB_565: RGB, 16 bits
* @COGL_PIXEL_FORMAT_RGBA_4444: RGBA, 16 bits
* @COGL_PIXEL_FORMAT_RGBA_5551: RGBA, 16 bits
@@ -313,6 +314,8 @@ typedef enum { /*< prefix=COGL_PIXEL_FORMAT >*/
COGL_PIXEL_FORMAT_ANY = 0,
COGL_PIXEL_FORMAT_A_8 = (1 | COGL_A_BIT),
+ COGL_PIXEL_FORMAT_RG_88 = 2,
+
COGL_PIXEL_FORMAT_RGB_565 = (2 | COGL_BITWISE_BIT),
COGL_PIXEL_FORMAT_RGBA_4444 = (2 | COGL_BITWISE_BIT | COGL_A_BIT),
COGL_PIXEL_FORMAT_RGBA_4444_PRE = (2 | COGL_PIXEL_FORMAT_RGBA_4444 | COGL_PREMULT_BIT),
diff --git a/cogl/driver/gl/gl/cogl-driver-gl.c b/cogl/driver/gl/gl/cogl-driver-gl.c
index 92d3c23..edc6541 100644
--- a/cogl/driver/gl/gl/cogl-driver-gl.c
+++ b/cogl/driver/gl/gl/cogl-driver-gl.c
@@ -62,6 +62,10 @@ _cogl_driver_pixel_format_from_gl_internal (CoglContext *context,
*out_format = COGL_PIXEL_FORMAT_A_8;
return TRUE;
+ case GL_RG:
+ *out_format = COGL_PIXEL_FORMAT_RG_88;
+ return TRUE;
+
case GL_RGB: case GL_RGB4: case GL_RGB5: case GL_RGB8:
case GL_RGB10: case GL_RGB12: case GL_RGB16: case GL_R3_G3_B2:
@@ -113,6 +117,26 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
gltype = GL_UNSIGNED_BYTE;
break;
+ case COGL_PIXEL_FORMAT_RG_88:
+ if (cogl_has_feature (context, COGL_FEATURE_ID_TEXTURE_RG))
+ {
+ glintformat = GL_RG;
+ glformat = GL_RG;
+ }
+ 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;
+ }
+ gltype = GL_UNSIGNED_BYTE;
+ break;
+
case COGL_PIXEL_FORMAT_RGB_888:
glintformat = GL_RGB;
glformat = GL_RGB;
@@ -594,6 +618,12 @@ _cogl_driver_update_features (CoglContext *ctx,
if (ctx->glFenceSync)
COGL_FLAGS_SET (ctx->features, COGL_FEATURE_ID_FENCE, TRUE);
+ if (COGL_CHECK_GL_VERSION (gl_major, gl_minor, 3, 0) ||
+ _cogl_check_extension ("GL_ARB_texture_rg", gl_extensions))
+ COGL_FLAGS_SET (ctx->features,
+ COGL_FEATURE_ID_TEXTURE_RG,
+ TRUE);
+
/* Cache features */
for (i = 0; i < G_N_ELEMENTS (private_features); i++)
ctx->private_features[i] |= private_features[i];
diff --git a/cogl/driver/gl/gles/cogl-driver-gles.c b/cogl/driver/gl/gles/cogl-driver-gles.c
index 27317bf..61e1e3f 100644
--- a/cogl/driver/gl/gles/cogl-driver-gles.c
+++ b/cogl/driver/gl/gles/cogl-driver-gles.c
@@ -44,6 +44,12 @@
#ifndef GL_DEPTH_STENCIL
#define GL_DEPTH_STENCIL 0x84F9
#endif
+#ifndef GL_RG
+#define GL_RG 0x8227
+#endif
+#ifndef GL_RG8
+#define GL_RG8 0x822B
+#endif
static CoglBool
_cogl_driver_pixel_format_from_gl_internal (CoglContext *context,
@@ -76,6 +82,26 @@ _cogl_driver_pixel_format_to_gl (CoglContext *context,
gltype = GL_UNSIGNED_BYTE;
break;
+ case COGL_PIXEL_FORMAT_RG_88:
+ if (cogl_has_feature (context, COGL_FEATURE_ID_TEXTURE_RG))
+ {
+ glintformat = GL_RG8;
+ glformat = GL_RG;
+ }
+ 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;
+ }
+ gltype = GL_UNSIGNED_BYTE;
+ break;
+
case COGL_PIXEL_FORMAT_BGRA_8888:
case COGL_PIXEL_FORMAT_BGRA_8888_PRE:
/* There is an extension to support this format */
@@ -335,6 +361,11 @@ _cogl_driver_update_features (CoglContext *context,
_cogl_check_extension ("GL_OES_egl_sync", gl_extensions))
COGL_FLAGS_SET (private_features, COGL_PRIVATE_FEATURE_OES_EGL_SYNC, TRUE);
+ if (_cogl_check_extension ("GL_EXT_texture_rg", gl_extensions))
+ COGL_FLAGS_SET (context->features,
+ COGL_FEATURE_ID_TEXTURE_RG,
+ TRUE);
+
/* Cache features */
for (i = 0; i < G_N_ELEMENTS (private_features); i++)
context->private_features[i] |= private_features[i];
diff --git a/test-fixtures/test-utils.c b/test-fixtures/test-utils.c
index a70d492..8a0a388 100644
--- a/test-fixtures/test-utils.c
+++ b/test-fixtures/test-utils.c
@@ -42,6 +42,12 @@ check_flags (TestFlags flags,
return FALSE;
}
+ if (flags & TEST_REQUIREMENT_TEXTURE_RG &&
+ !cogl_has_feature (test_ctx, COGL_FEATURE_ID_TEXTURE_RG))
+ {
+ return FALSE;
+ }
+
if (flags & TEST_REQUIREMENT_POINT_SPRITE &&
!cogl_has_feature (test_ctx, COGL_FEATURE_ID_POINT_SPRITE))
{
diff --git a/test-fixtures/test-utils.h b/test-fixtures/test-utils.h
index 5e40370..9c3ced9 100644
--- a/test-fixtures/test-utils.h
+++ b/test-fixtures/test-utils.h
@@ -35,13 +35,14 @@ typedef enum _TestFlags
TEST_REQUIREMENT_NPOT = 1<<2,
TEST_REQUIREMENT_TEXTURE_3D = 1<<3,
TEST_REQUIREMENT_TEXTURE_RECTANGLE = 1<<4,
- TEST_REQUIREMENT_POINT_SPRITE = 1<<5,
- TEST_REQUIREMENT_GLES2_CONTEXT = 1<<6,
- TEST_REQUIREMENT_MAP_WRITE = 1<<7,
- TEST_REQUIREMENT_GLSL = 1<<8,
- TEST_REQUIREMENT_OFFSCREEN = 1<<9,
- TEST_REQUIREMENT_FENCE = 1<<10,
- TEST_REQUIREMENT_PER_VERTEX_POINT_SIZE = 1<<11
+ TEST_REQUIREMENT_TEXTURE_RG = 1<<5,
+ TEST_REQUIREMENT_POINT_SPRITE = 1<<6,
+ TEST_REQUIREMENT_GLES2_CONTEXT = 1<<7,
+ TEST_REQUIREMENT_MAP_WRITE = 1<<8,
+ TEST_REQUIREMENT_GLSL = 1<<9,
+ TEST_REQUIREMENT_OFFSCREEN = 1<<10,
+ TEST_REQUIREMENT_FENCE = 1<<11,
+ TEST_REQUIREMENT_PER_VERTEX_POINT_SIZE = 1<<12
} TestFlags;
/**
diff --git a/tests/conform/Makefile.am b/tests/conform/Makefile.am
index e3493a9..edfe940 100644
--- a/tests/conform/Makefile.am
+++ b/tests/conform/Makefile.am
@@ -66,6 +66,7 @@ test_sources = \
test-pipeline-cache-unrefs-texture.c \
test-texture-no-allocate.c \
test-pipeline-shader-state.c \
+ test-texture-rg.c \
$(NULL)
if !USING_EMSCRIPTEN
diff --git a/tests/conform/test-conform-main.c b/tests/conform/test-conform-main.c
index 116d29d..c119d79 100644
--- a/tests/conform/test-conform-main.c
+++ b/tests/conform/test-conform-main.c
@@ -151,6 +151,8 @@ main (int argc, char **argv)
ADD_TEST (test_texture_no_allocate, 0, 0);
+ ADD_TEST (test_texture_rg, TEST_REQUIREMENT_TEXTURE_RG, 0);
+
g_printerr ("Unknown test name \"%s\"\n", argv[1]);
return 1;
diff --git a/tests/conform/test-read-texture-formats.c b/tests/conform/test-read-texture-formats.c
index 12b04ae..4fa9ecc 100644
--- a/tests/conform/test-read-texture-formats.c
+++ b/tests/conform/test-read-texture-formats.c
@@ -80,6 +80,23 @@ test_read_888 (CoglTexture2D *tex_2d,
}
static void
+test_read_88 (CoglTexture2D *tex_2d,
+ CoglPixelFormat format,
+ uint32_t expected_pixel)
+{
+ uint8_t pixel[4];
+
+ pixel[2] = 0x00;
+
+ cogl_texture_get_data (tex_2d,
+ format,
+ 2, /* rowstride */
+ pixel);
+
+ test_utils_compare_pixel (pixel, expected_pixel);
+}
+
+static void
test_read_8888 (CoglTexture2D *tex_2d,
CoglPixelFormat format,
uint32_t expected_pixel)
@@ -155,6 +172,11 @@ test_read_texture_formats (void)
test_read_byte (tex_2d, COGL_PIXEL_FORMAT_A_8, 0x78);
+ /* We should always be able to read into an RG buffer regardless of
+ * whether RG textures are supported because Cogl will do the
+ * conversion for us */
+ test_read_88 (tex_2d, COGL_PIXEL_FORMAT_RG_88, 0x123400ff);
+
test_read_short (tex_2d, COGL_PIXEL_FORMAT_RGB_565,
5, 0x12, 6, 0x34, 5, 0x56,
-1);
diff --git a/tests/conform/test-texture-rg.c b/tests/conform/test-texture-rg.c
new file mode 100644
index 0000000..72a5ae9
--- /dev/null
+++ b/tests/conform/test-texture-rg.c
@@ -0,0 +1,74 @@
+#include <cogl/cogl.h>
+
+#include <string.h>
+
+#include "test-utils.h"
+
+#define TEX_WIDTH 8
+#define TEX_HEIGHT 8
+
+static CoglTexture2D *
+make_texture (void)
+{
+ uint8_t tex_data[TEX_WIDTH * TEX_HEIGHT * 2], *p = tex_data;
+ int x, y;
+
+ for (y = 0; y < TEX_HEIGHT; y++)
+ for (x = 0; x < TEX_WIDTH; x++)
+ {
+ *(p++) = x * 256 / TEX_WIDTH;
+ *(p++) = y * 256 / TEX_HEIGHT;
+ }
+
+ return cogl_texture_2d_new_from_data (test_ctx,
+ TEX_WIDTH, TEX_HEIGHT,
+ COGL_PIXEL_FORMAT_RG_88,
+ TEX_WIDTH * 2,
+ tex_data,
+ NULL);
+}
+
+void
+test_texture_rg (void)
+{
+ CoglPipeline *pipeline;
+ CoglTexture2D *tex;
+ int fb_width, fb_height;
+ int x, y;
+
+ fb_width = cogl_framebuffer_get_width (test_fb);
+ fb_height = cogl_framebuffer_get_height (test_fb);
+
+ tex = make_texture ();
+
+ g_assert (cogl_texture_get_components (tex) == COGL_TEXTURE_COMPONENTS_RG);
+
+ pipeline = cogl_pipeline_new (test_ctx);
+
+ cogl_pipeline_set_layer_texture (pipeline, 0, tex);
+ cogl_pipeline_set_layer_filters (pipeline,
+ 0,
+ COGL_PIPELINE_FILTER_NEAREST,
+ COGL_PIPELINE_FILTER_NEAREST);
+
+ cogl_framebuffer_draw_rectangle (test_fb,
+ pipeline,
+ -1.0f, 1.0f,
+ 1.0f, -1.0f);
+
+ for (y = 0; y < TEX_HEIGHT; y++)
+ for (x = 0; x < TEX_WIDTH; x++)
+ {
+ test_utils_check_pixel_rgb (test_fb,
+ x * fb_width / TEX_WIDTH +
+ fb_width / (TEX_WIDTH * 2),
+ y * fb_height / TEX_HEIGHT +
+ fb_height / (TEX_HEIGHT * 2),
+ x * 256 / TEX_WIDTH,
+ y * 256 / TEX_HEIGHT,
+ 0);
+ }
+
+ cogl_object_unref (pipeline);
+ cogl_object_unref (tex);
+}
diff --git a/tests/conform/test-write-texture-formats.c b/tests/conform/test-write-texture-formats.c
index b1c2111..4e6c02a 100644
--- a/tests/conform/test-write-texture-formats.c
+++ b/tests/conform/test-write-texture-formats.c
@@ -131,6 +131,11 @@ test_write_texture_formats (void)
{
test_write_byte (COGL_PIXEL_FORMAT_A_8, 0x34, 0x00000034);
+ /* We should always be able to read from an RG buffer regardless of
+ * whether RG textures are supported because Cogl will do the
+ * conversion for us */
+ test_write_bytes (COGL_PIXEL_FORMAT_RG_88, 0x123456ff, 0x123400ff);
+
test_write_short (COGL_PIXEL_FORMAT_RGB_565, 0x0843, 0x080819ff);
test_write_short (COGL_PIXEL_FORMAT_RGBA_4444_PRE, 0x1234, 0x11223344);
test_write_short (COGL_PIXEL_FORMAT_RGBA_5551_PRE, 0x0887, 0x081019ff);
--
1.8.4.2
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