643 lines
22 KiB
C
643 lines
22 KiB
C
/*
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* Cogl
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*
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2011 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*
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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "cogl-texture.h"
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#include "cogl-matrix.h"
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#include "cogl-spans.h"
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#include "cogl-meta-texture.h"
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#include "cogl-texture-rectangle-private.h"
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#include <string.h>
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#include <math.h>
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typedef struct _ForeachData
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{
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float meta_region_coords[4];
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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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int width;
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int height;
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CoglTexture *padded_textures[9];
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const float *grid_slice_texture_coords;
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float slice_offset_s;
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float slice_offset_t;
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float slice_range_s;
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float slice_range_t;
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} ForeachData;
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static void
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padded_grid_repeat_cb (CoglTexture *slice_texture,
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const float *slice_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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ForeachData *data;
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float mapped_coords[4];
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/* Ignore padding slices for the current grid */
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if (!slice_texture)
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return;
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data = user_data;
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/* NB: the slice_texture_coords[] we get here will always be
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* normalized.
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*
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* We now need to map the normalized slice_texture_coords[] we have
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* here back to the real slice coordinates we saved in the previous
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* stage...
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*/
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mapped_coords[0] =
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slice_texture_coords[0] * data->slice_range_s + data->slice_offset_s;
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mapped_coords[1] =
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slice_texture_coords[1] * data->slice_range_t + data->slice_offset_t;
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mapped_coords[2] =
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slice_texture_coords[2] * data->slice_range_s + data->slice_offset_s;
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mapped_coords[3] =
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slice_texture_coords[3] * data->slice_range_t + data->slice_offset_t;
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data->callback (slice_texture,
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mapped_coords, meta_coords, data->user_data);
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}
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static int
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setup_padded_spans (CoglSpan *spans,
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float start,
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float end,
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float range,
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int *real_index)
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{
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int span_index = 0;
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if (start > 0)
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{
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spans[0].start = 0;
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spans[0].size = start;
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spans[0].waste = 0;
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span_index++;
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spans[1].start = spans[0].size;
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}
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else
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spans[span_index].start = 0;
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spans[span_index].size = end - start;
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spans[span_index].waste = 0;
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*real_index = span_index;
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span_index++;
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if (end < range)
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{
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spans[span_index].start =
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spans[span_index - 1].start + spans[span_index - 1].size;
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spans[span_index].size = range - end;
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spans[span_index].waste = 0;
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span_index++;
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}
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return span_index;
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}
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/* This handles each sub-texture within the range [0,1] of our
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* original meta texture and repeats each one separately across the
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* users requested virtual texture coordinates.
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*
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* A notable advantage of this approach is that we will batch
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* together callbacks corresponding to the same underlying slice
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* together.
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*/
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static void
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create_grid_and_repeat_cb (CoglTexture *slice_texture,
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const float *slice_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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ForeachData *data = user_data;
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CoglSpan x_spans[3];
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int n_x_spans;
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int x_real_index;
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CoglSpan y_spans[3];
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int n_y_spans;
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int y_real_index;
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/* NB: This callback is called for each slice of the meta-texture
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* in the range [0,1].
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*
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* We define a "padded grid" for each slice of the meta-texture in
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* the range [0,1]. The x axis and y axis grid lines are defined
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* using CoglSpans.
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*
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* The padded grid maps over the meta-texture coordinates in the
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* range [0,1] but only contains one valid cell that corresponds to
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* current slice being iterated and all the surrounding cells just
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* provide padding.
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*
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* Once we've defined our padded grid we then repeat that across
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* the user's original region, calling their callback whenever
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* we see our current slice - ignoring padding.
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*
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* NB: we can assume meta_coords[] are normalized at this point
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* since TextureRectangles aren't iterated with this code-path.
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*
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* NB: spans are always defined using non-normalized coordinates
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*/
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n_x_spans = setup_padded_spans (x_spans,
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meta_coords[0] * data->width,
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meta_coords[2] * data->width,
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data->width,
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&x_real_index);
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n_y_spans = setup_padded_spans (y_spans,
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meta_coords[1] * data->height,
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meta_coords[3] * data->height,
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data->height,
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&y_real_index);
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data->padded_textures[n_x_spans * y_real_index + x_real_index] =
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slice_texture;
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/* Our callback is going to be passed normalized slice texture
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* coordinates, and we will need to map the range [0,1] to the real
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* slice_texture_coords we have here... */
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data->grid_slice_texture_coords = slice_texture_coords;
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data->slice_range_s = fabs (data->grid_slice_texture_coords[2] -
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data->grid_slice_texture_coords[0]);
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data->slice_range_t = fabs (data->grid_slice_texture_coords[3] -
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data->grid_slice_texture_coords[1]);
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data->slice_offset_s = MIN (data->grid_slice_texture_coords[0],
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data->grid_slice_texture_coords[2]);
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data->slice_offset_t = MIN (data->grid_slice_texture_coords[1],
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data->grid_slice_texture_coords[3]);
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/* Now actually iterate the region the user originally requested
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* using the current padded grid */
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_cogl_texture_spans_foreach_in_region (x_spans,
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n_x_spans,
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y_spans,
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n_y_spans,
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data->padded_textures,
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data->meta_region_coords,
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data->width,
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data->height,
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data->wrap_s,
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data->wrap_t,
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padded_grid_repeat_cb,
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data);
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/* Clear the padded_textures ready for the next iteration */
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data->padded_textures[n_x_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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CoglBool s_flipped;
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CoglBool 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 CoglBool
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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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void *user_data;
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float s_normalize_factor;
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float t_normalize_factor;
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} NormalizeData;
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static void
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normalize_meta_coords_cb (CoglTexture *slice_texture,
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const float *slice_coords,
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const float *meta_coords,
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void *user_data)
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{
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NormalizeData *data = user_data;
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float normalized_meta_coords[4] = {
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meta_coords[0] * data->s_normalize_factor,
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meta_coords[1] * data->t_normalize_factor,
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meta_coords[2] * data->s_normalize_factor,
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meta_coords[3] * data->t_normalize_factor
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};
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data->callback (slice_texture,
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slice_coords, normalized_meta_coords,
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data->user_data);
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}
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typedef struct _UnNormalizeData
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{
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CoglMetaTextureCallback callback;
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void *user_data;
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float width;
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float height;
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} UnNormalizeData;
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static void
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un_normalize_slice_coords_cb (CoglTexture *slice_texture,
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const float *slice_coords,
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const float *meta_coords,
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void *user_data)
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{
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UnNormalizeData *data = user_data;
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float un_normalized_slice_coords[4] = {
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slice_coords[0] * data->width,
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slice_coords[1] * data->height,
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slice_coords[2] * data->width,
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slice_coords[3] * data->height
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};
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data->callback (slice_texture,
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un_normalized_slice_coords, meta_coords,
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data->user_data);
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}
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void
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cogl_meta_texture_foreach_in_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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CoglTexture *texture = COGL_TEXTURE (meta_texture);
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float width = cogl_texture_get_width (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;
|
|
if (wrap_t == COGL_PIPELINE_WRAP_MODE_AUTOMATIC)
|
|
wrap_t = COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE;
|
|
|
|
if (wrap_s == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE ||
|
|
wrap_t == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
|
|
{
|
|
CoglBool finished = foreach_clamped_region (meta_texture,
|
|
&tx_1, &ty_1, &tx_2, &ty_2,
|
|
wrap_s, wrap_t,
|
|
callback,
|
|
user_data);
|
|
if (finished)
|
|
return;
|
|
|
|
/* Since clamping has been handled we now want to normalize our
|
|
* wrap modes we se can assume from this point on we don't
|
|
* need to consider CLAMP_TO_EDGE. (NB: The spans code will
|
|
* assert that CLAMP_TO_EDGE isn't requested) */
|
|
if (wrap_s == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
|
|
wrap_s = COGL_PIPELINE_WRAP_MODE_REPEAT;
|
|
if (wrap_t == COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE)
|
|
wrap_t = COGL_PIPELINE_WRAP_MODE_REPEAT;
|
|
}
|
|
|
|
/* It makes things simpler to deal with non-normalized region
|
|
* coordinates beyond this point and only re-normalize just before
|
|
* calling the user's callback... */
|
|
|
|
if (!cogl_is_texture_rectangle (COGL_TEXTURE (meta_texture)))
|
|
{
|
|
normalize_data.callback = callback;
|
|
normalize_data.user_data = user_data;
|
|
normalize_data.s_normalize_factor = 1.0f / width;
|
|
normalize_data.t_normalize_factor = 1.0f / height;
|
|
callback = normalize_meta_coords_cb;
|
|
user_data = &normalize_data;
|
|
tx_1 *= width;
|
|
ty_1 *= height;
|
|
tx_2 *= width;
|
|
ty_2 *= height;
|
|
}
|
|
|
|
/* XXX: at some point this wont be routed through the CoglTexture
|
|
* vtable, instead there will be a separate CoglMetaTexture
|
|
* interface vtable. */
|
|
|
|
if (texture->vtable->foreach_sub_texture_in_region)
|
|
{
|
|
ForeachData data;
|
|
|
|
data.meta_region_coords[0] = tx_1;
|
|
data.meta_region_coords[1] = ty_1;
|
|
data.meta_region_coords[2] = tx_2;
|
|
data.meta_region_coords[3] = ty_2;
|
|
data.wrap_s = wrap_s;
|
|
data.wrap_t = wrap_t;
|
|
data.callback = callback;
|
|
data.user_data = user_data;
|
|
|
|
data.width = width;
|
|
data.height = height;
|
|
|
|
memset (data.padded_textures, 0, sizeof (data.padded_textures));
|
|
|
|
/*
|
|
* 1) We iterate all the slices of the meta-texture only within
|
|
* the range [0,1].
|
|
*
|
|
* 2) We define a "padded grid" for each slice of the
|
|
* meta-texture in the range [0,1].
|
|
*
|
|
* The padded grid maps over the meta-texture coordinates in
|
|
* the range [0,1] but only contains one valid cell that
|
|
* corresponds to current slice being iterated and all the
|
|
* surrounding cells just provide padding.
|
|
*
|
|
* 3) Once we've defined our padded grid we then repeat that
|
|
* across the user's original region, calling their callback
|
|
* whenever we see our current slice - ignoring padding.
|
|
*
|
|
* A notable benefit of this design is that repeating a texture
|
|
* made of multiple slices will result in us repeating each
|
|
* slice in-turn so the user gets repeat callbacks for the same
|
|
* texture batched together. For manual emulation of texture
|
|
* repeats done by drawing geometry this makes it more likely
|
|
* that we can batch geometry.
|
|
*/
|
|
|
|
texture->vtable->foreach_sub_texture_in_region (texture,
|
|
0, 0, 1, 1,
|
|
create_grid_and_repeat_cb,
|
|
&data);
|
|
}
|
|
else
|
|
{
|
|
CoglSpan x_span = { 0, width, 0 };
|
|
CoglSpan y_span = { 0, height, 0 };
|
|
float meta_region_coords[4] = { tx_1, ty_1, tx_2, ty_2 };
|
|
UnNormalizeData un_normalize_data;
|
|
|
|
/* If we are dealing with a CoglTextureRectangle then we need a shim
|
|
* callback that un_normalizes the slice coordinates we get from
|
|
* _cogl_texture_spans_foreach_in_region before passing them to
|
|
* the user's callback. */
|
|
if (cogl_is_texture_rectangle (meta_texture))
|
|
{
|
|
un_normalize_data.callback = callback;
|
|
un_normalize_data.user_data = user_data;
|
|
un_normalize_data.width = width;
|
|
un_normalize_data.height = height;
|
|
callback = un_normalize_slice_coords_cb;
|
|
user_data = &un_normalize_data;
|
|
}
|
|
|
|
_cogl_texture_spans_foreach_in_region (&x_span, 1,
|
|
&y_span, 1,
|
|
&texture,
|
|
meta_region_coords,
|
|
width,
|
|
height,
|
|
wrap_s,
|
|
wrap_t,
|
|
callback,
|
|
user_data);
|
|
}
|
|
}
|
|
#undef SWAP
|