CoglBool
_cogl_bitmap_copy_subregion (CoglBitmap *src,
CoglBitmap *dst,
int src_x,
int src_y,
int dst_x,
int dst_y,
int width,
int height,
CoglError **error)
{
uint8_t *srcdata;
uint8_t *dstdata;
int bpp;
int line;
CoglBool succeeded = FALSE;
/* Intended only for fast copies when format is equal! */
_COGL_RETURN_VAL_IF_FAIL ((src->format & ~COGL_PREMULT_BIT) ==
(dst->format & ~COGL_PREMULT_BIT),
FALSE);
bpp = _cogl_pixel_format_get_bytes_per_pixel (src->format);
if ((srcdata = _cogl_bitmap_map (src, COGL_BUFFER_ACCESS_READ, 0, error)))
{
if ((dstdata =
_cogl_bitmap_map (dst, COGL_BUFFER_ACCESS_WRITE, 0, error)))
{
srcdata += src_y * src->rowstride + src_x * bpp;
dstdata += dst_y * dst->rowstride + dst_x * bpp;
for (line = 0; line < height; ++line)
{
memcpy (dstdata, srcdata, width * bpp);
srcdata += src->rowstride;
dstdata += dst->rowstride;
}
succeeded = TRUE;
_cogl_bitmap_unmap (dst);
}
_cogl_bitmap_unmap (src);
}
return succeeded;
}
uint8_t *
_cogl_bitmap_gl_bind (CoglBitmap *bitmap,
CoglBufferAccess access,
CoglBufferMapHint hints,
CoglError **error)
{
uint8_t *ptr;
CoglError *internal_error = NULL;
g_return_val_if_fail (access & (COGL_BUFFER_ACCESS_READ |
COGL_BUFFER_ACCESS_WRITE),
NULL);
/* Divert to another bitmap if this data is shared */
if (bitmap->shared_bmp)
return _cogl_bitmap_gl_bind (bitmap->shared_bmp, access, hints, error);
_COGL_RETURN_VAL_IF_FAIL (!bitmap->bound, NULL);
/* If the bitmap wasn't created from a buffer then the
implementation of bind is the same as map */
if (bitmap->buffer == NULL)
{
uint8_t *data = _cogl_bitmap_map (bitmap, access, hints, error);
if (data)
bitmap->bound = TRUE;
return data;
}
if (access == COGL_BUFFER_ACCESS_READ)
ptr = _cogl_buffer_gl_bind (bitmap->buffer,
COGL_BUFFER_BIND_TARGET_PIXEL_UNPACK,
&internal_error);
else if (access == COGL_BUFFER_ACCESS_WRITE)
ptr = _cogl_buffer_gl_bind (bitmap->buffer,
COGL_BUFFER_BIND_TARGET_PIXEL_PACK,
&internal_error);
else
{
ptr = NULL;
g_assert_not_reached ();
return NULL;
}
/* NB: _cogl_buffer_gl_bind() may return NULL in non-error
* conditions so we have to explicitly check internal_error to see
* if an exception was thrown */
if (internal_error)
{
_cogl_propagate_error (error, internal_error);
return NULL;
}
bitmap->bound = TRUE;
/* The data pointer actually stores the offset */
return ptr + GPOINTER_TO_INT (bitmap->data);
}
uint8_t *
_cogl_bitmap_map (CoglBitmap *bitmap,
CoglBufferAccess access,
CoglBufferMapHint hints,
CoglError **error)
{
/* Divert to another bitmap if this data is shared */
if (bitmap->shared_bmp)
return _cogl_bitmap_map (bitmap->shared_bmp, access, hints, error);
g_assert (!bitmap->mapped);
if (bitmap->buffer)
{
uint8_t *data = cogl_buffer_map (bitmap->buffer,
access,
hints,
error);
COGL_NOTE (BITMAP, "A pixel array is being mapped from a bitmap. This "
"usually means that some conversion on the pixel array is "
"needed so a sub-optimal format is being used.");
if (data)
{
bitmap->mapped = TRUE;
return data + GPOINTER_TO_INT (bitmap->data);
}
else
return NULL;
}
else
{
bitmap->mapped = TRUE;
return bitmap->data;
}
}
CoglTexture3D *
cogl_texture_3d_new_from_data (CoglContext *context,
int width,
int height,
int depth,
CoglPixelFormat format,
int rowstride,
int image_stride,
const uint8_t *data,
CoglError **error)
{
CoglBitmap *bitmap;
CoglTexture3D *ret;
_COGL_RETURN_VAL_IF_FAIL (data, NULL);
_COGL_RETURN_VAL_IF_FAIL (format != COGL_PIXEL_FORMAT_ANY, NULL);
/* Rowstride from width if not given */
if (rowstride == 0)
rowstride = width * _cogl_pixel_format_get_bytes_per_pixel (format);
/* Image stride from height and rowstride if not given */
if (image_stride == 0)
image_stride = height * rowstride;
if (image_stride < rowstride * height)
return NULL;
/* GL doesn't support uploading when the image_stride isn't a
multiple of the rowstride. If this happens we'll just pack the
image into a new bitmap. The documentation for this function
recommends avoiding this situation. */
if (image_stride % rowstride != 0)
{
uint8_t *bmp_data;
int bmp_rowstride;
int z, y;
bitmap = _cogl_bitmap_new_with_malloc_buffer (context,
width,
depth * height,
format,
error);
if (!bitmap)
return NULL;
bmp_data = _cogl_bitmap_map (bitmap,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD,
error);
if (bmp_data == NULL)
{
cogl_object_unref (bitmap);
return NULL;
}
bmp_rowstride = cogl_bitmap_get_rowstride (bitmap);
/* Copy all of the images in */
for (z = 0; z < depth; z++)
for (y = 0; y < height; y++)
memcpy (bmp_data + (z * bmp_rowstride * height +
bmp_rowstride * y),
data + z * image_stride + rowstride * y,
bmp_rowstride);
_cogl_bitmap_unmap (bitmap);
}
else
bitmap = cogl_bitmap_new_for_data (context,
width,
image_stride / rowstride * depth,
format,
rowstride,
(uint8_t *) data);
ret = cogl_texture_3d_new_from_bitmap (bitmap,
height,
depth);
cogl_object_unref (bitmap);
if (ret &&
!cogl_texture_allocate (COGL_TEXTURE (ret), error))
{
cogl_object_unref (ret);
return NULL;
}
return ret;
}
static CoglBool
allocate_from_bitmap (CoglTexture3D *tex_3d,
CoglTextureLoader *loader,
CoglError **error)
{
CoglTexture *tex = COGL_TEXTURE (tex_3d);
CoglContext *ctx = tex->context;
CoglPixelFormat internal_format;
CoglBitmap *bmp = loader->src.bitmap.bitmap;
int bmp_width = cogl_bitmap_get_width (bmp);
int height = loader->src.bitmap.height;
int depth = loader->src.bitmap.depth;
CoglPixelFormat bmp_format = cogl_bitmap_get_format (bmp);
CoglBool can_convert_in_place = loader->src.bitmap.can_convert_in_place;
CoglBitmap *upload_bmp;
CoglPixelFormat upload_format;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
internal_format = _cogl_texture_determine_internal_format (tex, bmp_format);
if (!_cogl_texture_3d_can_create (ctx,
bmp_width, height, depth,
internal_format,
error))
return FALSE;
upload_bmp = _cogl_bitmap_convert_for_upload (bmp,
internal_format,
can_convert_in_place,
error);
if (upload_bmp == NULL)
return FALSE;
upload_format = cogl_bitmap_get_format (upload_bmp);
ctx->driver_vtable->pixel_format_to_gl (ctx,
upload_format,
NULL, /* internal format */
&gl_format,
&gl_type);
ctx->driver_vtable->pixel_format_to_gl (ctx,
internal_format,
&gl_intformat,
NULL,
NULL);
/* Keep a copy of the first pixel so that if glGenerateMipmap isn't
supported we can fallback to using GL_GENERATE_MIPMAP */
if (!cogl_has_feature (ctx, COGL_FEATURE_ID_OFFSCREEN))
{
CoglError *ignore = NULL;
uint8_t *data = _cogl_bitmap_map (upload_bmp,
COGL_BUFFER_ACCESS_READ, 0,
&ignore);
tex_3d->first_pixel.gl_format = gl_format;
tex_3d->first_pixel.gl_type = gl_type;
if (data)
{
memcpy (tex_3d->first_pixel.data, data,
_cogl_pixel_format_get_bytes_per_pixel (upload_format));
_cogl_bitmap_unmap (upload_bmp);
}
else
{
g_warning ("Failed to read first pixel of bitmap for "
"glGenerateMipmap fallback");
cogl_error_free (ignore);
memset (tex_3d->first_pixel.data, 0,
_cogl_pixel_format_get_bytes_per_pixel (upload_format));
}
}
tex_3d->gl_texture =
ctx->texture_driver->gen (ctx, GL_TEXTURE_3D, internal_format);
if (!ctx->texture_driver->upload_to_gl_3d (ctx,
GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE, /* is_foreign */
height,
depth,
upload_bmp,
gl_intformat,
gl_format,
gl_type,
error))
{
cogl_object_unref (upload_bmp);
return FALSE;
}
tex_3d->gl_format = gl_intformat;
cogl_object_unref (upload_bmp);
tex_3d->depth = loader->src.bitmap.depth;
tex_3d->internal_format = internal_format;
_cogl_texture_set_allocated (tex, internal_format,
bmp_width, loader->src.bitmap.height);
return TRUE;
}
gboolean
_cogl_texture_2d_gl_copy_from_bitmap (CoglTexture2D *tex_2d,
int src_x,
int src_y,
int width,
int height,
CoglBitmap *bmp,
int dst_x,
int dst_y,
int level,
CoglError **error)
{
CoglTexture *tex = COGL_TEXTURE (tex_2d);
CoglContext *ctx = tex->context;
CoglBitmap *upload_bmp;
CoglPixelFormat upload_format;
GLenum gl_format;
GLenum gl_type;
gboolean status = TRUE;
upload_bmp =
_cogl_bitmap_convert_for_upload (bmp,
_cogl_texture_get_format (tex),
FALSE, /* can't convert in place */
error);
if (upload_bmp == NULL)
return FALSE;
upload_format = cogl_bitmap_get_format (upload_bmp);
ctx->driver_vtable->pixel_format_to_gl (ctx,
upload_format,
NULL, /* internal gl format */
&gl_format,
&gl_type);
/* If this touches the first pixel then we'll update our copy */
if (dst_x == 0 && dst_y == 0 &&
!cogl_has_feature (ctx, COGL_FEATURE_ID_OFFSCREEN))
{
CoglError *ignore = NULL;
uint8_t *data =
_cogl_bitmap_map (upload_bmp, COGL_BUFFER_ACCESS_READ, 0, &ignore);
CoglPixelFormat bpp =
_cogl_pixel_format_get_bytes_per_pixel (upload_format);
tex_2d->first_pixel.gl_format = gl_format;
tex_2d->first_pixel.gl_type = gl_type;
if (data)
{
memcpy (tex_2d->first_pixel.data,
(data +
cogl_bitmap_get_rowstride (upload_bmp) * src_y +
bpp * src_x),
bpp);
_cogl_bitmap_unmap (bmp);
}
else
{
g_warning ("Failed to read first bitmap pixel for "
"glGenerateMipmap fallback");
cogl_error_free (ignore);
memset (tex_2d->first_pixel.data, 0, bpp);
}
}
status = ctx->texture_driver->upload_subregion_to_gl (ctx,
tex,
FALSE,
src_x, src_y,
dst_x, dst_y,
width, height,
level,
upload_bmp,
gl_format,
gl_type,
error);
cogl_object_unref (upload_bmp);
_cogl_texture_gl_maybe_update_max_level (tex, level);
return status;
}
static gboolean
allocate_from_bitmap (CoglTexture2D *tex_2d,
CoglTextureLoader *loader,
CoglError **error)
{
CoglTexture *tex = COGL_TEXTURE (tex_2d);
CoglBitmap *bmp = loader->src.bitmap.bitmap;
CoglContext *ctx = _cogl_bitmap_get_context (bmp);
CoglPixelFormat internal_format;
int width = cogl_bitmap_get_width (bmp);
int height = cogl_bitmap_get_height (bmp);
gboolean can_convert_in_place = loader->src.bitmap.can_convert_in_place;
CoglBitmap *upload_bmp;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
internal_format =
_cogl_texture_determine_internal_format (tex, cogl_bitmap_get_format (bmp));
if (!_cogl_texture_2d_gl_can_create (ctx,
width,
height,
internal_format))
{
_cogl_set_error (error, COGL_TEXTURE_ERROR,
COGL_TEXTURE_ERROR_SIZE,
"Failed to create texture 2d due to size/format"
" constraints");
return FALSE;
}
upload_bmp = _cogl_bitmap_convert_for_upload (bmp,
internal_format,
can_convert_in_place,
error);
if (upload_bmp == NULL)
return FALSE;
ctx->driver_vtable->pixel_format_to_gl (ctx,
cogl_bitmap_get_format (upload_bmp),
NULL, /* internal format */
&gl_format,
&gl_type);
ctx->driver_vtable->pixel_format_to_gl (ctx,
internal_format,
&gl_intformat,
NULL,
NULL);
/* Keep a copy of the first pixel so that if glGenerateMipmap isn't
supported we can fallback to using GL_GENERATE_MIPMAP */
if (!cogl_has_feature (ctx, COGL_FEATURE_ID_OFFSCREEN))
{
CoglError *ignore = NULL;
uint8_t *data = _cogl_bitmap_map (upload_bmp,
COGL_BUFFER_ACCESS_READ, 0,
&ignore);
CoglPixelFormat format = cogl_bitmap_get_format (upload_bmp);
tex_2d->first_pixel.gl_format = gl_format;
tex_2d->first_pixel.gl_type = gl_type;
if (data)
{
memcpy (tex_2d->first_pixel.data, data,
_cogl_pixel_format_get_bytes_per_pixel (format));
_cogl_bitmap_unmap (upload_bmp);
}
else
{
g_warning ("Failed to read first pixel of bitmap for "
"glGenerateMipmap fallback");
cogl_error_free (ignore);
memset (tex_2d->first_pixel.data, 0,
_cogl_pixel_format_get_bytes_per_pixel (format));
}
}
tex_2d->gl_texture =
ctx->texture_driver->gen (ctx, GL_TEXTURE_2D, internal_format);
if (!ctx->texture_driver->upload_to_gl (ctx,
GL_TEXTURE_2D,
tex_2d->gl_texture,
FALSE,
upload_bmp,
gl_intformat,
gl_format,
gl_type,
error))
{
cogl_object_unref (upload_bmp);
return FALSE;
}
tex_2d->gl_internal_format = gl_intformat;
cogl_object_unref (upload_bmp);
tex_2d->internal_format = internal_format;
_cogl_texture_set_allocated (tex, internal_format, width, height);
return TRUE;
}
/* the error does not contain the filename as the caller already has it */
CoglBitmap *
_cogl_bitmap_from_file (const char *filename,
GError **error)
{
CFURLRef url;
CGImageSourceRef image_source;
CGImageRef image;
int save_errno;
CFStringRef type;
size_t width, height, rowstride;
uint8_t *out_data;
CGColorSpaceRef color_space;
CGContextRef bitmap_context;
CoglBitmap *bmp;
_COGL_GET_CONTEXT (ctx, NULL);
g_assert (filename != NULL);
g_assert (error == NULL || *error == NULL);
url = CFURLCreateFromFileSystemRepresentation (NULL,
(guchar *) filename,
strlen (filename),
false);
image_source = CGImageSourceCreateWithURL (url, NULL);
save_errno = errno;
CFRelease (url);
if (image_source == NULL)
{
/* doesn't exist, not readable, etc. */
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_FAILED,
g_strerror (save_errno));
return NULL;
}
/* Unknown images would be cleanly caught as zero width/height below, but try
* to provide better error message
*/
type = CGImageSourceGetType (image_source);
if (type == NULL)
{
CFRelease (image_source);
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_UNKNOWN_TYPE,
"Unknown image type");
return NULL;
}
CFRelease (type);
image = CGImageSourceCreateImageAtIndex (image_source, 0, NULL);
CFRelease (image_source);
width = CGImageGetWidth (image);
height = CGImageGetHeight (image);
if (width == 0 || height == 0)
{
/* incomplete or corrupt */
CFRelease (image);
g_set_error_literal (error,
COGL_BITMAP_ERROR,
COGL_BITMAP_ERROR_CORRUPT_IMAGE,
"Image has zero width or height");
return NULL;
}
/* allocate buffer big enough to hold pixel data */
bmp = _cogl_bitmap_new_with_malloc_buffer (ctx,
width, height,
COGL_PIXEL_FORMAT_ARGB_8888);
rowstride = cogl_bitmap_get_rowstride (bmp);
out_data = _cogl_bitmap_map (bmp,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
/* render to buffer */
color_space = CGColorSpaceCreateWithName (kCGColorSpaceGenericRGB);
bitmap_context = CGBitmapContextCreate (out_data,
width, height, 8,
rowstride, color_space,
kCGImageAlphaPremultipliedFirst);
CGColorSpaceRelease (color_space);
{
const CGRect rect = {{0, 0}, {width, height}};
CGContextDrawImage (bitmap_context, rect, image);
}
CGImageRelease (image);
CGContextRelease (bitmap_context);
_cogl_bitmap_unmap (bmp);
/* store bitmap info */
return bmp;
}
int
cogl_texture_get_data (CoglHandle handle,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
CoglTexture *tex;
int bpp;
int byte_size;
CoglPixelFormat closest_format;
int closest_bpp;
GLenum closest_gl_format;
GLenum closest_gl_type;
CoglBitmap *target_bmp;
CoglBitmap *new_bmp;
guint8 *src;
guint8 *dst;
int y;
int tex_width;
int tex_height;
CoglTextureGetData tg_data;
if (!cogl_is_texture (handle))
return 0;
tex = COGL_TEXTURE (handle);
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = cogl_texture_get_format (handle);
tex_width = cogl_texture_get_width (handle);
tex_height = cogl_texture_get_height (handle);
/* Rowstride from texture width if none specified */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0)
rowstride = tex_width * bpp;
/* Return byte size if only that requested */
byte_size = tex_height * rowstride;
if (data == NULL)
return byte_size;
closest_format =
_cogl_texture_driver_find_best_gl_get_data_format (format,
&closest_gl_format,
&closest_gl_type);
closest_bpp = _cogl_get_format_bpp (closest_format);
/* Is the requested format supported? */
if (closest_format == format)
/* Target user data directly */
target_bmp = _cogl_bitmap_new_from_data (data,
format,
tex_width,
tex_height,
rowstride,
NULL, NULL);
else
{
int target_rowstride = tex_width * closest_bpp;
guint8 *target_data = g_malloc (tex_height * target_rowstride);
target_bmp = _cogl_bitmap_new_from_data (target_data,
closest_format,
tex_width,
tex_height,
target_rowstride,
(CoglBitmapDestroyNotify) g_free,
NULL);
}
tg_data.orig_width = tex_width;
tg_data.orig_height = tex_height;
tg_data.target_bmp = target_bmp;
tg_data.target_bits = _cogl_bitmap_map (target_bmp, COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
if (tg_data.target_bits == NULL)
{
cogl_object_unref (target_bmp);
return 0;
}
tg_data.success = TRUE;
/* Iterating through the subtextures allows piecing together
* the data for a sliced texture, and allows us to do the
* read-from-framebuffer logic here in a simple fashion rather than
* passing offsets down through the code. */
_cogl_texture_foreach_sub_texture_in_region (handle,
0, 0, 1, 1,
texture_get_cb,
&tg_data);
_cogl_bitmap_unmap (target_bmp);
/* XXX: In some cases _cogl_texture_2d_download_from_gl may fail
* to read back the texture data; such as for GLES which doesn't
* support glGetTexImage, so here we fallback to drawing the
* texture and reading the pixels from the framebuffer. */
if (!tg_data.success)
_cogl_texture_draw_and_read (tex, target_bmp,
closest_gl_format,
closest_gl_type);
/* Was intermediate used? */
if (closest_format != format)
{
guint8 *new_bmp_data;
int new_bmp_rowstride;
/* Convert to requested format */
new_bmp = _cogl_bitmap_convert_format_and_premult (target_bmp,
format);
/* Free intermediate data and return if failed */
cogl_object_unref (target_bmp);
if (new_bmp == NULL)
return 0;
new_bmp_rowstride = _cogl_bitmap_get_rowstride (new_bmp);
new_bmp_data = _cogl_bitmap_map (new_bmp, COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
if (new_bmp_data == NULL)
{
cogl_object_unref (new_bmp);
return 0;
}
/* Copy to user buffer */
for (y = 0; y < tex_height; ++y)
{
src = new_bmp_data + y * new_bmp_rowstride;
dst = data + y * rowstride;
memcpy (dst, src, tex_width * bpp);
}
_cogl_bitmap_unmap (new_bmp);
/* Free converted data */
cogl_object_unref (new_bmp);
}
return byte_size;
}
/* Reads back the contents of a texture by rendering it to the framebuffer
* and reading back the resulting pixels.
*
* NB: Normally this approach isn't normally used since we can just use
* glGetTexImage, but may be used as a fallback in some circumstances.
*/
gboolean
_cogl_texture_draw_and_read (CoglHandle handle,
CoglBitmap *target_bmp,
GLuint target_gl_format,
GLuint target_gl_type)
{
int bpp;
CoglFramebuffer *framebuffer;
int viewport[4];
CoglBitmap *alpha_bmp;
CoglMatrixStack *projection_stack;
CoglMatrixStack *modelview_stack;
int target_width = _cogl_bitmap_get_width (target_bmp);
int target_height = _cogl_bitmap_get_height (target_bmp);
int target_rowstride = _cogl_bitmap_get_rowstride (target_bmp);
_COGL_GET_CONTEXT (ctx, FALSE);
bpp = _cogl_get_format_bpp (COGL_PIXEL_FORMAT_RGBA_8888);
framebuffer = _cogl_get_draw_buffer ();
/* Viewport needs to have some size and be inside the window for this */
_cogl_framebuffer_get_viewport4fv (framebuffer, viewport);
if (viewport[0] < 0 || viewport[1] < 0 ||
viewport[2] <= 0 || viewport[3] <= 0)
return FALSE;
/* Setup orthographic projection into current viewport (0,0 in top-left
* corner to draw the texture upside-down so we match the way cogl_read_pixels
* works)
*/
projection_stack = _cogl_framebuffer_get_projection_stack (framebuffer);
_cogl_matrix_stack_push (projection_stack);
_cogl_matrix_stack_load_identity (projection_stack);
_cogl_matrix_stack_ortho (projection_stack,
0, (float)(viewport[2]),
(float)(viewport[3]), 0,
(float)(0),
(float)(100));
modelview_stack = _cogl_framebuffer_get_modelview_stack (framebuffer);
_cogl_matrix_stack_push (modelview_stack);
_cogl_matrix_stack_load_identity (modelview_stack);
/* Direct copy operation */
if (ctx->texture_download_pipeline == COGL_INVALID_HANDLE)
{
ctx->texture_download_pipeline = cogl_pipeline_new ();
cogl_pipeline_set_blend (ctx->texture_download_pipeline,
"RGBA = ADD (SRC_COLOR, 0)",
NULL);
}
cogl_push_source (ctx->texture_download_pipeline);
cogl_pipeline_set_layer_texture (ctx->texture_download_pipeline, 0, handle);
cogl_pipeline_set_layer_combine (ctx->texture_download_pipeline,
0, /* layer */
"RGBA = REPLACE (TEXTURE)",
NULL);
cogl_pipeline_set_layer_filters (ctx->texture_download_pipeline, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
do_texture_draw_and_read (handle, target_bmp, viewport);
/* Check whether texture has alpha and framebuffer not */
/* FIXME: For some reason even if ALPHA_BITS is 8, the framebuffer
still doesn't seem to have an alpha buffer. This might be just
a PowerVR issue.
GLint r_bits, g_bits, b_bits, a_bits;
GE( glGetIntegerv (GL_ALPHA_BITS, &a_bits) );
GE( glGetIntegerv (GL_RED_BITS, &r_bits) );
GE( glGetIntegerv (GL_GREEN_BITS, &g_bits) );
GE( glGetIntegerv (GL_BLUE_BITS, &b_bits) );
printf ("R bits: %d\n", r_bits);
printf ("G bits: %d\n", g_bits);
printf ("B bits: %d\n", b_bits);
printf ("A bits: %d\n", a_bits); */
if ((cogl_texture_get_format (handle) & COGL_A_BIT)/* && a_bits == 0*/)
{
guint8 *srcdata;
guint8 *dstdata;
guint8 *srcpixel;
guint8 *dstpixel;
int x,y;
int alpha_rowstride = bpp * target_width;
if ((dstdata = _cogl_bitmap_map (target_bmp,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD)) == NULL)
return FALSE;
srcdata = g_malloc (alpha_rowstride * target_height);
/* Create temp bitmap for alpha values */
alpha_bmp = _cogl_bitmap_new_from_data (srcdata,
COGL_PIXEL_FORMAT_RGBA_8888,
target_width, target_height,
alpha_rowstride,
(CoglBitmapDestroyNotify) g_free,
NULL);
/* Draw alpha values into RGB channels */
cogl_pipeline_set_layer_combine (ctx->texture_download_pipeline,
0, /* layer */
"RGBA = REPLACE (TEXTURE[A])",
NULL);
do_texture_draw_and_read (handle, alpha_bmp, viewport);
/* Copy temp R to target A */
for (y=0; y<target_height; ++y)
{
for (x=0; x<target_width; ++x)
{
srcpixel = srcdata + x*bpp;
dstpixel = dstdata + x*bpp;
dstpixel[3] = srcpixel[0];
}
srcdata += alpha_rowstride;
dstdata += target_rowstride;
}
_cogl_bitmap_unmap (target_bmp);
cogl_object_unref (alpha_bmp);
}
/* Restore old state */
_cogl_matrix_stack_pop (modelview_stack);
_cogl_matrix_stack_pop (projection_stack);
/* restore the original pipeline */
cogl_pop_source ();
return TRUE;
}
