8b4034cd06
* cogl_texture_get_data() is converted to use _cogl_texture_foreach_sub_texture_in_region() to iterate through the underlying textures. * When we need to read only a portion of the underlying texture, we set up a FBO and use _cogl_read_pixels() to read the portion we need. This is enormously more efficient for reading a small portion of a large atlas texture. * The CoglAtlasTexture, CoglSubTexture, and CoglTexture2dSliced implementation of get_texture() are removed. http://bugzilla.clutter-project.org/show_bug.cgi?id=2414
473 lines
15 KiB
C
473 lines
15 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2009,2010 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Neil Roberts <neil@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.h"
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#include "cogl-internal.h"
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#include "cogl-util.h"
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#include "cogl-texture-private.h"
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#include "cogl-sub-texture-private.h"
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#include "cogl-context.h"
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#include "cogl-handle.h"
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#include "cogl-texture-driver.h"
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#include <string.h>
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#include <math.h>
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static void _cogl_sub_texture_free (CoglSubTexture *sub_tex);
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COGL_TEXTURE_INTERNAL_DEFINE (SubTexture, sub_texture);
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static const CoglTextureVtable cogl_sub_texture_vtable;
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static void
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_cogl_sub_texture_map_range (float *t1, float *t2,
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int sub_offset,
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int sub_size,
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int full_size)
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{
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float t1_frac, t1_int, t2_frac, t2_int;
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t1_frac = modff (*t1, &t1_int);
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t2_frac = modff (*t2, &t2_int);
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if (t1_frac < 0.0f)
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{
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t1_frac += 1.0f;
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t1_int -= 1.0f;
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}
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if (t2_frac < 0.0f)
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{
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t2_frac += 1.0f;
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t2_int -= 1.0f;
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}
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/* If one of the coordinates is zero we need to make sure it is
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still greater than the other coordinate if it was originally so
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we'll flip it to the other side */
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if (*t1 < *t2)
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{
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if (t2_frac == 0.0f)
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{
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t2_frac = 1.0f;
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t2_int -= 1.0f;
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}
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}
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else
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{
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if (t1_frac == 0.0f)
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{
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t1_frac = 1.0f;
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t1_int -= 1.0f;
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}
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}
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/* Convert the fractional part leaving the integer part intact */
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t1_frac = (sub_offset + t1_frac * sub_size) / full_size;
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*t1 = t1_frac + t1_int;
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t2_frac = (sub_offset + t2_frac * sub_size) / full_size;
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*t2 = t2_frac + t2_int;
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}
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static void
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_cogl_sub_texture_map_quad (CoglSubTexture *sub_tex,
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float *coords)
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{
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unsigned int full_width = cogl_texture_get_width (sub_tex->full_texture);
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unsigned int full_height = cogl_texture_get_height (sub_tex->full_texture);
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_cogl_sub_texture_map_range (coords + 0, coords + 2,
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sub_tex->sub_x, sub_tex->sub_width,
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full_width);
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_cogl_sub_texture_map_range (coords + 1, coords + 3,
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sub_tex->sub_y, sub_tex->sub_height,
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full_height);
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}
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/* Maps from the texture coordinates of the full texture to the
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texture coordinates of the sub texture */
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static float
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_cogl_sub_texture_unmap_coord (float t,
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int sub_offset,
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int sub_size,
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int full_size)
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{
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float frac_part, int_part;
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/* Convert the fractional part leaving the integer part in tact */
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frac_part = modff (t, &int_part);
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if (cogl_util_float_signbit (frac_part))
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frac_part = ((1.0f + frac_part) * full_size -
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sub_offset - sub_size) / sub_size;
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else
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frac_part = (frac_part * full_size - sub_offset) / sub_size;
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return frac_part + int_part;
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}
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static void
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_cogl_sub_texture_unmap_coords (CoglSubTexture *sub_tex,
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float *s,
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float *t)
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{
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unsigned int full_width = cogl_texture_get_width (sub_tex->full_texture);
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unsigned int full_height = cogl_texture_get_height (sub_tex->full_texture);
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*s = _cogl_sub_texture_unmap_coord (*s, sub_tex->sub_x, sub_tex->sub_width,
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full_width);
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*t = _cogl_sub_texture_unmap_coord (*t, sub_tex->sub_y, sub_tex->sub_height,
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full_height);
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}
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typedef struct _CoglSubTextureForeachData
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{
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CoglSubTexture *sub_tex;
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CoglTextureSliceCallback callback;
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void *user_data;
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} CoglSubTextureForeachData;
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static void
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_cogl_sub_texture_foreach_cb (CoglHandle handle,
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const float *slice_coords,
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const float *full_virtual_coords,
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void *user_data)
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{
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CoglSubTextureForeachData *data = user_data;
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float virtual_coords[4];
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memcpy (virtual_coords, full_virtual_coords, sizeof (virtual_coords));
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/* Convert the virtual coords from the full-texture space to the sub
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texture space */
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_cogl_sub_texture_unmap_coords (data->sub_tex,
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&virtual_coords[0],
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&virtual_coords[1]);
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_cogl_sub_texture_unmap_coords (data->sub_tex,
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&virtual_coords[2],
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&virtual_coords[3]);
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data->callback (handle,
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slice_coords, virtual_coords,
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data->user_data);
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}
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static void
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_cogl_sub_texture_manual_repeat_cb (const float *coords,
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void *user_data)
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{
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CoglSubTextureForeachData *data = user_data;
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float mapped_coords[4];
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memcpy (mapped_coords, coords, sizeof (mapped_coords));
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_cogl_sub_texture_map_quad (data->sub_tex, mapped_coords);
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_cogl_texture_foreach_sub_texture_in_region (data->sub_tex->full_texture,
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mapped_coords[0],
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mapped_coords[1],
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mapped_coords[2],
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mapped_coords[3],
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_cogl_sub_texture_foreach_cb,
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user_data);
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}
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static void
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_cogl_sub_texture_foreach_sub_texture_in_region (
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CoglTexture *tex,
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float virtual_tx_1,
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float virtual_ty_1,
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float virtual_tx_2,
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float virtual_ty_2,
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CoglTextureSliceCallback callback,
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void *user_data)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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CoglSubTextureForeachData data;
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data.sub_tex = sub_tex;
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data.callback = callback;
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data.user_data = user_data;
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_cogl_texture_iterate_manual_repeats (_cogl_sub_texture_manual_repeat_cb,
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virtual_tx_1, virtual_ty_1,
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virtual_tx_2, virtual_ty_2,
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&data);
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}
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static void
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_cogl_sub_texture_set_wrap_mode_parameters (CoglTexture *tex,
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GLenum wrap_mode_s,
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GLenum wrap_mode_t,
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GLenum wrap_mode_p)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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_cogl_texture_set_wrap_mode_parameters (sub_tex->full_texture,
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wrap_mode_s,
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wrap_mode_t,
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wrap_mode_p);
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}
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static void
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_cogl_sub_texture_free (CoglSubTexture *sub_tex)
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{
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cogl_handle_unref (sub_tex->next_texture);
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cogl_handle_unref (sub_tex->full_texture);
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/* Chain up */
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_cogl_texture_free (COGL_TEXTURE (sub_tex));
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}
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CoglHandle
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_cogl_sub_texture_new (CoglHandle next_texture,
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int sub_x, int sub_y,
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int sub_width, int sub_height)
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{
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CoglHandle full_texture;
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CoglSubTexture *sub_tex;
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CoglTexture *tex;
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unsigned int next_width, next_height;
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next_width = cogl_texture_get_width (next_texture);
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next_height = cogl_texture_get_height (next_texture);
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/* The region must specify a non-zero subset of the full texture */
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g_return_val_if_fail (sub_x >= 0 && sub_y >= 0, COGL_INVALID_HANDLE);
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g_return_val_if_fail (sub_width > 0 && sub_height > 0, COGL_INVALID_HANDLE);
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g_return_val_if_fail (sub_x + sub_width <= next_width, COGL_INVALID_HANDLE);
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g_return_val_if_fail (sub_y + sub_height <= next_height, COGL_INVALID_HANDLE);
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sub_tex = g_new (CoglSubTexture, 1);
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tex = COGL_TEXTURE (sub_tex);
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tex->vtable = &cogl_sub_texture_vtable;
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/* If the next texture is also a sub texture we can avoid one level
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of indirection by referencing the full texture of that texture
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instead. */
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if (_cogl_is_sub_texture (next_texture))
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{
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CoglSubTexture *other_sub_tex =
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_cogl_sub_texture_pointer_from_handle (next_texture);
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full_texture = other_sub_tex->full_texture;
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sub_x += other_sub_tex->sub_x;
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sub_y += other_sub_tex->sub_y;
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}
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else
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full_texture = next_texture;
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sub_tex->next_texture = cogl_handle_ref (next_texture);
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sub_tex->full_texture = cogl_handle_ref (full_texture);
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sub_tex->sub_x = sub_x;
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sub_tex->sub_y = sub_y;
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sub_tex->sub_width = sub_width;
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sub_tex->sub_height = sub_height;
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return _cogl_sub_texture_handle_new (sub_tex);
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}
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static int
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_cogl_sub_texture_get_max_waste (CoglTexture *tex)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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return cogl_texture_get_max_waste (sub_tex->full_texture);
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}
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static gboolean
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_cogl_sub_texture_is_sliced (CoglTexture *tex)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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return cogl_texture_is_sliced (sub_tex->full_texture);
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}
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static gboolean
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_cogl_sub_texture_can_hardware_repeat (CoglTexture *tex)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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/* We can hardware repeat if the subtexture actually represents all of the
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of the full texture */
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return (sub_tex->sub_width ==
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cogl_texture_get_width (sub_tex->full_texture) &&
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sub_tex->sub_height ==
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cogl_texture_get_height (sub_tex->full_texture) &&
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_cogl_texture_can_hardware_repeat (sub_tex->full_texture));
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}
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static void
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_cogl_sub_texture_transform_coords_to_gl (CoglTexture *tex,
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float *s,
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float *t)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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/* This won't work if the sub texture is not the size of the full
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texture and the coordinates are outside the range [0,1] */
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*s = ((*s * sub_tex->sub_width + sub_tex->sub_x) /
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cogl_texture_get_width (sub_tex->full_texture));
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*t = ((*t * sub_tex->sub_height + sub_tex->sub_y) /
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cogl_texture_get_height (sub_tex->full_texture));
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_cogl_texture_transform_coords_to_gl (sub_tex->full_texture, s, t);
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}
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static CoglTransformResult
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_cogl_sub_texture_transform_quad_coords_to_gl (CoglTexture *tex,
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float *coords)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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int i;
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/* We can't support repeating with this method. In this case
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cogl-primitives will resort to manual repeating */
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for (i = 0; i < 4; i++)
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if (coords[i] < 0.0f || coords[i] > 1.0f)
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return COGL_TRANSFORM_SOFTWARE_REPEAT;
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_cogl_sub_texture_map_quad (sub_tex, coords);
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return _cogl_texture_transform_quad_coords_to_gl (sub_tex->full_texture,
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coords);
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}
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static gboolean
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_cogl_sub_texture_get_gl_texture (CoglTexture *tex,
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GLuint *out_gl_handle,
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GLenum *out_gl_target)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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return cogl_texture_get_gl_texture (sub_tex->full_texture,
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out_gl_handle,
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out_gl_target);
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}
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static void
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_cogl_sub_texture_set_filters (CoglTexture *tex,
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GLenum min_filter,
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GLenum mag_filter)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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_cogl_texture_set_filters (sub_tex->full_texture, min_filter, mag_filter);
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}
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static void
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_cogl_sub_texture_pre_paint (CoglTexture *tex,
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CoglTexturePrePaintFlags flags)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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_cogl_texture_pre_paint (sub_tex->full_texture, flags);
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}
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static void
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_cogl_sub_texture_ensure_non_quad_rendering (CoglTexture *tex)
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{
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}
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static gboolean
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_cogl_sub_texture_set_region (CoglTexture *tex,
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int src_x,
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int src_y,
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int dst_x,
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int dst_y,
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unsigned int dst_width,
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unsigned int dst_height,
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CoglBitmap *bmp)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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return _cogl_texture_set_region_from_bitmap (sub_tex->full_texture,
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src_x, src_y,
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dst_x + sub_tex->sub_x,
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dst_y + sub_tex->sub_y,
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dst_width, dst_height,
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bmp);
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}
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static CoglPixelFormat
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_cogl_sub_texture_get_format (CoglTexture *tex)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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return cogl_texture_get_format (sub_tex->full_texture);
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}
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static GLenum
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_cogl_sub_texture_get_gl_format (CoglTexture *tex)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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return _cogl_texture_get_gl_format (sub_tex->full_texture);
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}
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static int
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_cogl_sub_texture_get_width (CoglTexture *tex)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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return sub_tex->sub_width;
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}
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static int
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_cogl_sub_texture_get_height (CoglTexture *tex)
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{
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CoglSubTexture *sub_tex = COGL_SUB_TEXTURE (tex);
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return sub_tex->sub_height;
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}
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static const CoglTextureVtable
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cogl_sub_texture_vtable =
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{
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_cogl_sub_texture_set_region,
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NULL, /* get_data */
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_cogl_sub_texture_foreach_sub_texture_in_region,
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_cogl_sub_texture_get_max_waste,
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_cogl_sub_texture_is_sliced,
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_cogl_sub_texture_can_hardware_repeat,
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_cogl_sub_texture_transform_coords_to_gl,
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_cogl_sub_texture_transform_quad_coords_to_gl,
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_cogl_sub_texture_get_gl_texture,
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_cogl_sub_texture_set_filters,
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_cogl_sub_texture_pre_paint,
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_cogl_sub_texture_ensure_non_quad_rendering,
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_cogl_sub_texture_set_wrap_mode_parameters,
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_cogl_sub_texture_get_format,
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_cogl_sub_texture_get_gl_format,
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_cogl_sub_texture_get_width,
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_cogl_sub_texture_get_height,
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NULL /* is_foreign */
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};
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