static gboolean
_cogl_blit_framebuffer_begin (CoglBlitData *data)
{
CoglHandle dst_fbo, src_fbo;
gboolean ret;
_COGL_GET_CONTEXT (ctx, FALSE);
/* We can only blit between FBOs if both textures are the same
format and the blit framebuffer extension is supported */
if ((cogl_texture_get_format (data->src_tex) & ~COGL_A_BIT) !=
(cogl_texture_get_format (data->dst_tex) & ~COGL_A_BIT) ||
!(ctx->private_feature_flags & COGL_PRIVATE_FEATURE_OFFSCREEN_BLIT))
return FALSE;
dst_fbo = _cogl_offscreen_new_to_texture_full
(data->dst_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
if (dst_fbo == COGL_INVALID_HANDLE)
ret = FALSE;
else
{
if (!cogl_framebuffer_allocate (dst_fbo, NULL))
ret = FALSE;
else
{
src_fbo = _cogl_offscreen_new_to_texture_full
(data->src_tex,
COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL,
0 /* level */);
if (src_fbo == COGL_INVALID_HANDLE)
ret = FALSE;
else
{
if (!cogl_framebuffer_allocate (src_fbo, NULL))
ret = FALSE;
else
_cogl_push_framebuffers (dst_fbo, src_fbo);
cogl_handle_unref (src_fbo);
}
}
cogl_handle_unref (dst_fbo);
}
return ret;
}
static gboolean
_cogl_blit_copy_tex_sub_image_begin (CoglBlitData *data)
{
CoglHandle fbo;
_COGL_GET_CONTEXT (ctx, FALSE);
/* This will only work if the target texture is a CoglTexture2D */
if (!cogl_is_texture_2d (data->dst_tex))
return FALSE;
fbo = _cogl_offscreen_new_to_texture_full
(data->src_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
if (fbo == COGL_INVALID_HANDLE)
return FALSE;
if (!cogl_framebuffer_allocate (fbo, NULL))
{
cogl_handle_unref (fbo);
return FALSE;
}
cogl_push_framebuffer (fbo);
cogl_handle_unref (fbo);
return TRUE;
}
static gboolean
get_texture_bits_via_offscreen (CoglHandle texture_handle,
int x,
int y,
int width,
int height,
guint8 *dst_bits,
unsigned int dst_rowstride,
CoglPixelFormat dst_format)
{
CoglFramebuffer *framebuffer;
_COGL_GET_CONTEXT (ctx, FALSE);
if (!cogl_features_available (COGL_FEATURE_OFFSCREEN))
return FALSE;
framebuffer = _cogl_offscreen_new_to_texture_full
(texture_handle,
COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL,
0);
if (framebuffer == NULL)
return FALSE;
cogl_push_framebuffer (framebuffer);
_cogl_read_pixels_with_rowstride (x, y, width, height,
COGL_READ_PIXELS_COLOR_BUFFER,
dst_format, dst_bits, dst_rowstride);
cogl_pop_framebuffer ();
cogl_object_unref (framebuffer);
return TRUE;
}
static gboolean
_cogl_blit_texture_render_begin (CoglBlitData *data)
{
CoglHandle fbo;
CoglPipeline *pipeline;
unsigned int dst_width, dst_height;
_COGL_GET_CONTEXT (ctx, FALSE);
fbo = _cogl_offscreen_new_to_texture_full
(data->dst_tex, COGL_OFFSCREEN_DISABLE_DEPTH_AND_STENCIL, 0 /* level */);
if (fbo == COGL_INVALID_HANDLE)
return FALSE;
if (!cogl_framebuffer_allocate (fbo, NULL))
{
cogl_handle_unref (fbo);
return FALSE;
}
cogl_push_framebuffer (fbo);
cogl_handle_unref (fbo);
dst_width = cogl_texture_get_width (data->dst_tex);
dst_height = cogl_texture_get_height (data->dst_tex);
/* Set up an orthographic projection so we can use pixel
coordinates to render to the texture */
cogl_ortho (0, /* left */
dst_width, /* right */
dst_height, /* bottom */
0, /* top */
-1, /* near */
1 /* far */);
/* We cache a pipeline used for migrating on to the context so
that it doesn't have to continuously regenerate a shader
program */
if (ctx->blit_texture_pipeline == NULL)
{
ctx->blit_texture_pipeline = cogl_pipeline_new ();
cogl_pipeline_set_layer_filters (ctx->blit_texture_pipeline, 0,
COGL_PIPELINE_FILTER_NEAREST,
COGL_PIPELINE_FILTER_NEAREST);
/* Disable blending by just directly taking the contents of the
source texture */
cogl_pipeline_set_blend (ctx->blit_texture_pipeline,
"RGBA = ADD(SRC_COLOR, 0)",
NULL);
}
pipeline = ctx->blit_texture_pipeline;
cogl_pipeline_set_layer_texture (pipeline, 0, data->src_tex);
_cogl_push_source (pipeline, FALSE);
return TRUE;
}
