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meta-texture: Support CLAMP_TO_EDGE
cogl_meta_texture_foreach_in_region() now directly supports CLAMP_TO_EDGE wrap modes. This means the cogl_rectangle code will be able to build on this and makes the logic accessible to anyone developing custom primitives that need to support meta textures. Reviewed-by: Neil Roberts <neil@linux.intel.com>
This commit is contained in:
Robert Bragg
parent
8cf76ee36b
commit
4c49f83056
@ -217,6 +217,224 @@ create_grid_and_repeat_cb (CoglTexture *slice_texture,
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data->padded_textures[n_y_spans * y_real_index + x_real_index] = NULL;
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}
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#define SWAP(A,B) do { float tmp = B; B = A; A = tmp; } while (0)
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typedef struct _ClampData
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{
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float start;
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float end;
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gboolean s_flipped;
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gboolean t_flipped;
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CoglMetaTextureCallback callback;
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void *user_data;
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} ClampData;
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static void
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clamp_s_cb (CoglTexture *sub_texture,
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const float *sub_texture_coords,
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const float *meta_coords,
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void *user_data)
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{
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ClampData *clamp_data = user_data;
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float mapped_meta_coords[4] = {
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clamp_data->start,
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meta_coords[1],
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clamp_data->end,
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meta_coords[3]
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};
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if (clamp_data->s_flipped)
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SWAP (mapped_meta_coords[0], mapped_meta_coords[2]);
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/* NB: we never need to flip the t coords when dealing with
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* s-axis clamping so no need to check if ->t_flipped */
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clamp_data->callback (sub_texture,
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sub_texture_coords, mapped_meta_coords,
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clamp_data->user_data);
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}
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static void
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clamp_t_cb (CoglTexture *sub_texture,
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const float *sub_texture_coords,
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const float *meta_coords,
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void *user_data)
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{
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ClampData *clamp_data = user_data;
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float mapped_meta_coords[4] = {
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meta_coords[0],
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clamp_data->start,
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meta_coords[2],
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clamp_data->end,
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};
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if (clamp_data->s_flipped)
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SWAP (mapped_meta_coords[0], mapped_meta_coords[2]);
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if (clamp_data->t_flipped)
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SWAP (mapped_meta_coords[1], mapped_meta_coords[3]);
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clamp_data->callback (sub_texture,
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sub_texture_coords, mapped_meta_coords,
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clamp_data->user_data);
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}
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static gboolean
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foreach_clamped_region (CoglMetaTexture *meta_texture,
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float *tx_1,
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float *ty_1,
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float *tx_2,
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float *ty_2,
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CoglPipelineWrapMode wrap_s,
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CoglPipelineWrapMode wrap_t,
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CoglMetaTextureCallback callback,
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void *user_data)
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{
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float width = cogl_texture_get_width (COGL_TEXTURE (meta_texture));
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ClampData clamp_data;
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/* Consider that *tx_1 may be > *tx_2 and to simplify things
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* we just flip them around if that's the case and keep a note
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* of the fact that they are flipped. */
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if (*tx_1 > *tx_2)
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{
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SWAP (*tx_1, *tx_2);
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clamp_data.s_flipped = TRUE;
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}
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else
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clamp_data.s_flipped = FALSE;
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/* The same goes for ty_1 and ty_2... */
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if (*ty_1 > *ty_2)
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{
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SWAP (*ty_1, *ty_2);
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clamp_data.t_flipped = TRUE;
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}
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else
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clamp_data.t_flipped = FALSE;
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clamp_data.callback = callback;
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clamp_data.user_data = user_data;
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if (wrap_s == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
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{
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float max_s_coord;
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float half_texel_width;
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/* Consider that rectangle textures have non-normalized
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* coordinates... */
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if (cogl_is_texture_rectangle (meta_texture))
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max_s_coord = width;
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else
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max_s_coord = 1.0;
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half_texel_width = max_s_coord / (width * 2);
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/* Handle any left clamped region */
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if (*tx_1 < 0)
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{
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clamp_data.start = *tx_1;
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clamp_data.end = MIN (0, *tx_2);;
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cogl_meta_texture_foreach_in_region (meta_texture,
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half_texel_width, *ty_1,
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half_texel_width, *ty_2,
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COGL_PIPELINE_WRAP_MODE_REPEAT,
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wrap_t,
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clamp_s_cb,
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&clamp_data);
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/* Have we handled everything? */
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if (tx_2 <= 0)
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return TRUE;
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/* clamp tx_1 since we've handled everything with x < 0 */
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*tx_1 = 0;
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}
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/* Handle any right clamped region - including the corners */
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if (*tx_2 > max_s_coord)
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{
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clamp_data.start = MAX (max_s_coord, *tx_1);
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clamp_data.end = *tx_2;
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cogl_meta_texture_foreach_in_region (meta_texture,
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max_s_coord - half_texel_width,
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*ty_1,
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max_s_coord - half_texel_width,
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*ty_2,
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COGL_PIPELINE_WRAP_MODE_REPEAT,
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wrap_t,
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clamp_s_cb,
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&clamp_data);
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/* Have we handled everything? */
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if (*tx_1 >= max_s_coord)
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return TRUE;
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/* clamp tx_2 since we've handled everything with x >
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* max_s_coord */
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*tx_2 = max_s_coord;
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}
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}
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if (wrap_t == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
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{
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float height = cogl_texture_get_height (COGL_TEXTURE (meta_texture));
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float max_t_coord;
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float half_texel_height;
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/* Consider that rectangle textures have non-normalized
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* coordinates... */
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if (cogl_is_texture_rectangle (meta_texture))
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max_t_coord = height;
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else
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max_t_coord = 1.0;
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half_texel_height = max_t_coord / (height * 2);
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/* Handle any top clamped region */
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if (*ty_1 < 0)
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{
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clamp_data.start = *ty_1;
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clamp_data.end = MIN (0, *ty_2);;
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cogl_meta_texture_foreach_in_region (meta_texture,
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*tx_1, half_texel_height,
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*tx_2, half_texel_height,
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wrap_s,
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COGL_PIPELINE_WRAP_MODE_REPEAT,
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clamp_t_cb,
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&clamp_data);
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/* Have we handled everything? */
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if (tx_2 <= 0)
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return TRUE;
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/* clamp ty_1 since we've handled everything with y < 0 */
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*ty_1 = 0;
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}
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/* Handle any bottom clamped region */
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if (*ty_2 > max_t_coord)
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{
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clamp_data.start = MAX (max_t_coord, *ty_1);;
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clamp_data.end = *ty_2;
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cogl_meta_texture_foreach_in_region (meta_texture,
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*tx_1,
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max_t_coord - half_texel_height,
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*tx_2,
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max_t_coord - half_texel_height,
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wrap_s,
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COGL_PIPELINE_WRAP_MODE_REPEAT,
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clamp_t_cb,
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&clamp_data);
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/* Have we handled everything? */
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if (*ty_1 >= max_t_coord)
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return TRUE;
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/* clamp ty_2 since we've handled everything with y >
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* max_t_coord */
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*ty_2 = max_t_coord;
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}
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}
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if (clamp_data.s_flipped)
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SWAP (*tx_1, *tx_2);
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if (clamp_data.t_flipped)
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SWAP (*ty_1, *ty_2);
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return FALSE;
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}
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typedef struct _NormalizeData
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{
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CoglMetaTextureCallback callback;
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@ -287,6 +505,32 @@ cogl_meta_texture_foreach_in_region (CoglMetaTexture *meta_texture,
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float height = cogl_texture_get_height (texture);
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NormalizeData normalize_data;
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if (wrap_s == COGL_PIPELINE_WRAP_MODE_AUTOMATIC)
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wrap_s = COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE;
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if (wrap_t == COGL_PIPELINE_WRAP_MODE_AUTOMATIC)
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wrap_t = COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE;
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if (wrap_s == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE ||
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wrap_t == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
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{
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gboolean finished = foreach_clamped_region (meta_texture,
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&tx_1, &ty_1, &tx_2, &ty_2,
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wrap_s, wrap_t,
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callback,
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user_data);
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if (finished)
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return;
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/* Since clamping has been handled we now want to normalize our
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* wrap modes we se can assume from this point on we don't
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* need to consider CLAMP_TO_EDGE. (NB: The spans code will
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* assert that CLAMP_TO_EDGE isn't requested) */
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if (wrap_s == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
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wrap_s = COGL_PIPELINE_WRAP_MODE_REPEAT;
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if (wrap_t == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
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wrap_t = COGL_PIPELINE_WRAP_MODE_REPEAT;
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}
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/* It makes things simpler to deal with non-normalized region
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* coordinates beyond this point and only re-normalize just before
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* calling the user's callback... */
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@ -389,3 +633,4 @@ cogl_meta_texture_foreach_in_region (CoglMetaTexture *meta_texture,
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user_data);
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}
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}
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#undef SWAP
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@ -129,10 +129,8 @@ typedef void (*CoglMetaTextureCallback) (CoglTexture *sub_texture,
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* @ty_1: The top-left y coordinate of the region to iterate
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* @tx_2: The bottom-right x coordinate of the region to iterate
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* @ty_2: The bottom-right y coordinate of the region to iterate
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* @wrap_x: The wrap mode for the x-axis (Only
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* %COGL_PIPELINE_WRAP_MODE_REPEAT may be passed here.)
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* @wrap_y: The wrap mode for the y-axis (Only
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* %COGL_PIPELINE_WRAP_MODE_REPEAT may be passed here.)
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* @wrap_x: The wrap mode for the x-axis
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* @wrap_y: The wrap mode for the y-axis
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* @callback: A #CoglMetaTextureCallback pointer to be called
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* for each low-level texture within the specified region.
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* @user_data: A private pointer that is passed to @callback.
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@ -164,13 +162,6 @@ typedef void (*CoglMetaTextureCallback) (CoglTexture *sub_texture,
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* of the @meta_texture, @callback is called specifying how the
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* low-level texture maps to the original region.
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*
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* <note>Currently this interface can only be used to iterate in terms
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* of %COGL_PIPELINE_WRAP_MODE_REPEAT) which means if you want to
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* support %COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE for a custom
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* primitive then you need to do that manually by using this interface
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* to find edge textures and then stretching the edge texels out using
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* geometry.</note>
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*
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* Since: 1.10
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* Stability: unstable
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*/
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