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c40d5ae9ea
mutter/cogl/cogl-texture.c
Robert Bragg c40d5ae9ea [cogl-texture] Seal CoglTexture internals from cogl-primitives.c 
cogl-primitives.c was previously digging right into CoglTextures so it could
manually iterate the texture slices for texturing quads and polygons and
because we were missing some state getters we were lazily just poking into
the structures directly.

This adds some extra state getter functions, and adds a higher level
_cogl_texture_foreach_slice () API that hopefully simplifies the way in
which sliced textures may be used to render primitives.  This lets you
specify a rectangle in "virtual" texture coords and it will call a given
callback for each slice that intersects that rectangle giving the virtual
coords of the current slice and corresponding "real" texture coordinates for
the underlying gl texture.

At the same time a noteable bug in how we previously iterated sliced
textures was fixed, whereby we weren't correctly handling inverted texture
coordinates.  E.g.  with the previous code if you supplied texture coords of
tx1=100,ty1=0,tx2=0,ty2=100 (inverted along y axis) that would result in a
back-facing quad, which could be discarded if using back-face culling.
2009-10-16 18:58:51 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Authors:
* Matthew Allum <mallum@openedhand.com>
* Neil Roberts <neil@linux.intel.com>
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-util.h"
#include "cogl-bitmap.h"
#include "cogl-bitmap-private.h"
#include "cogl-texture-private.h"
#include "cogl-texture-driver.h"
#include "cogl-material.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-primitives.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
static void _cogl_texture_free (CoglTexture *tex);
COGL_HANDLE_DEFINE (Texture, texture);
static void
_cogl_texture_bitmap_free (CoglTexture *tex)
{
if (tex->bitmap.data != NULL && tex->bitmap_owner)
g_free (tex->bitmap.data);
tex->bitmap.data = NULL;
tex->bitmap_owner = FALSE;
}
static void
_cogl_texture_bitmap_swap (CoglTexture *tex,
CoglBitmap *new_bitmap)
{
if (tex->bitmap.data != NULL && tex->bitmap_owner)
g_free (tex->bitmap.data);
tex->bitmap = *new_bitmap;
tex->bitmap_owner = TRUE;
}
static void
_cogl_span_iter_update (CoglSpanIter *iter)
{
/* Pick current span */
iter->span = &g_array_index (iter->array,
CoglTexSliceSpan,
iter->index);
/* Offset next position by span size */
iter->next_pos = iter->pos +
(float)(iter->span->size - iter->span->waste);
/* Check if span intersects the area to cover */
if (iter->next_pos <= iter->cover_start ||
iter->pos >= iter->cover_end)
{
/* Intersection undefined */
iter->intersects = FALSE;
return;
}
iter->intersects = TRUE;
/* Clip start position to coverage area */
if (iter->pos < iter->cover_start)
iter->intersect_start = iter->cover_start;
else
iter->intersect_start = iter->pos;
/* Clip end position to coverage area */
if (iter->next_pos > iter->cover_end)
iter->intersect_end = iter->cover_end;
else
iter->intersect_end = iter->next_pos;
}
void
_cogl_span_iter_begin (CoglSpanIter *iter,
GArray *spans,
float normalize_factor,
float cover_start,
float cover_end)
{
float cover_start_normalized;
iter->index = 0;
iter->span = NULL;
iter->array = spans;
/* We always iterate in a positive direction from the origin. If
* iter->flipped == TRUE that means whoever is using this API should
* interpreted the current span as extending in the opposite direction. I.e.
* it extends to the left if iterating the X axis, or up if the Y axis. */
if (cover_start > cover_end)
{
float tmp = cover_start;
cover_start = cover_end;
cover_end = tmp;
iter->flipped = TRUE;
}
else
iter->flipped = FALSE;
/* The texture spans cover the normalized texture coordinate space ranging
* from [0,1] but to help support repeating of sliced textures we allow
* iteration of any range so we need to relate the start of the range to the
* nearest point equivalent to 0.
*/
cover_start_normalized = cover_start / normalize_factor;
iter->origin = floorf (cover_start_normalized) * normalize_factor;
iter->cover_start = cover_start;
iter->cover_end = cover_end;
iter->pos = iter->origin;
/* Update intersection */
_cogl_span_iter_update (iter);
}
void
_cogl_span_iter_next (CoglSpanIter *iter)
{
/* Move current position */
iter->pos = iter->next_pos;
/* Pick next slice (wrap when last reached) */
iter->index = (iter->index + 1) % iter->array->len;
/* Update intersection */
_cogl_span_iter_update (iter);
}
gboolean
_cogl_span_iter_end (CoglSpanIter *iter)
{
/* End reached when whole area covered */
return iter->pos >= iter->cover_end;
}
/* Some CoglTextures, notably sliced textures or atlas textures when repeating
* is used, will need to divide the coordinate space into multiple GL textures
* (or rather; in the case of atlases duplicate a single texture in multiple
* positions to handle repeating)
*
* This function helps you implement primitives using such textures by
* invoking a callback once for each sub texture that intersects a given
* region specified in texture coordinates.
*/
/* To differentiate between texture coordinates of a specific, real, slice
* texture and the texture coordinates of the composite, sliced texture, the
* coordinates of the sliced texture are called "virtual" coordinates and the
* coordinates of slices are called "slice" coordinates. */
/* This function lets you iterate all the slices that lie within the given
* virtual coordinates of the parent sliced texture. */
/* Note: no guarantee is given about the order in which the slices will be
* visited */
void
_cogl_texture_foreach_sub_texture_in_region (CoglHandle handle,
float virtual_tx_1,
float virtual_ty_1,
float virtual_tx_2,
float virtual_ty_2,
CoglTextureSliceCallback callback,
void *user_data)
{
CoglTexture *tex = _cogl_texture_pointer_from_handle (handle);
float width = tex->bitmap.width;
float height = tex->bitmap.height;
CoglSpanIter iter_x;
CoglSpanIter iter_y;
g_assert (tex->gl_target == GL_TEXTURE_2D);
/* Slice spans are stored in denormalized coordinates, and this is what
* the _cogl_span_iter_* funcs expect to be given, so we scale the given
* virtual coordinates by the texture size to denormalize.
*/
/* XXX: I wonder if it's worth changing how we store spans so we can avoid
* the need to denormalize here */
virtual_tx_1 *= width;
virtual_ty_1 *= height;
virtual_tx_2 *= width;
virtual_ty_2 *= height;
/* Iterate the y axis of the virtual rectangle */
for (_cogl_span_iter_begin (&iter_y,
tex->slice_y_spans,
height,
virtual_ty_1,
virtual_ty_2);
!_cogl_span_iter_end (&iter_y);
_cogl_span_iter_next (&iter_y))
{
float y_intersect_start = iter_y.intersect_start;
float y_intersect_end = iter_y.intersect_end;
float slice_ty1;
float slice_ty2;
/* Discard slices out of rectangle early */
if (!iter_y.intersects)
continue;
if (iter_y.flipped)
{
y_intersect_start = iter_y.intersect_end;
y_intersect_end = iter_y.intersect_start;
}
/* Localize slice texture coordinates */
slice_ty1 = y_intersect_start - iter_y.pos;
slice_ty2 = y_intersect_end - iter_y.pos;
/* Normalize slice texture coordinates */
slice_ty1 /= iter_y.span->size;
slice_ty2 /= iter_y.span->size;
/* Iterate the x axis of the virtual rectangle */
for (_cogl_span_iter_begin (&iter_x,
tex->slice_x_spans,
width,
virtual_tx_1,
virtual_tx_2);
!_cogl_span_iter_end (&iter_x);
_cogl_span_iter_next (&iter_x))
{
float slice_coords[4];
float virtual_coords[4];
float x_intersect_start = iter_x.intersect_start;
float x_intersect_end = iter_x.intersect_end;
float slice_tx1;
float slice_tx2;
GLuint gl_handle;
/* Discard slices out of rectangle early */
if (!iter_x.intersects)
continue;
if (iter_x.flipped)
{
x_intersect_start = iter_x.intersect_end;
x_intersect_end = iter_x.intersect_start;
}
/* Localize slice texture coordinates */
slice_tx1 = x_intersect_start - iter_x.pos;
slice_tx2 = x_intersect_end - iter_x.pos;
/* Normalize slice texture coordinates */
slice_tx1 /= iter_x.span->size;
slice_tx2 /= iter_x.span->size;
/* Pluck out opengl texture object for this slice */
gl_handle = g_array_index (tex->slice_gl_handles, GLuint,
iter_y.index * iter_x.array->len +
iter_x.index);
slice_coords[0] = slice_tx1;
slice_coords[1] = slice_ty1;
slice_coords[2] = slice_tx2;
slice_coords[3] = slice_ty2;
virtual_coords[0] = x_intersect_start / width;
virtual_coords[1] = y_intersect_start / height;
virtual_coords[2] = x_intersect_end / width;
virtual_coords[3] = y_intersect_end / height;
callback (tex,
gl_handle,
tex->gl_target,
slice_coords,
virtual_coords,
user_data);
}
}
}
void
_cogl_texture_prep_gl_alignment_for_pixels_upload (int pixels_rowstride)
{
if (!(pixels_rowstride & 0x7))
GE( glPixelStorei (GL_UNPACK_ALIGNMENT, 8) );
else if (!(pixels_rowstride & 0x3))
GE( glPixelStorei (GL_UNPACK_ALIGNMENT, 4) );
else if (!(pixels_rowstride & 0x1))
GE( glPixelStorei (GL_UNPACK_ALIGNMENT, 2) );
else
GE( glPixelStorei (GL_UNPACK_ALIGNMENT, 1) );
}
void
_cogl_texture_prep_gl_alignment_for_pixels_download (int pixels_rowstride)
{
if (!(pixels_rowstride & 0x7))
GE( glPixelStorei (GL_PACK_ALIGNMENT, 8) );
else if (!(pixels_rowstride & 0x3))
GE( glPixelStorei (GL_PACK_ALIGNMENT, 4) );
else if (!(pixels_rowstride & 0x1))
GE( glPixelStorei (GL_PACK_ALIGNMENT, 2) );
else
GE( glPixelStorei (GL_PACK_ALIGNMENT, 1) );
}
static guchar *
_cogl_texture_allocate_waste_buffer (CoglTexture *tex)
{
CoglTexSliceSpan *last_x_span;
CoglTexSliceSpan *last_y_span;
guchar *waste_buf = NULL;
/* If the texture has any waste then allocate a buffer big enough to
fill the gaps */
last_x_span = &g_array_index (tex->slice_x_spans, CoglTexSliceSpan,
tex->slice_x_spans->len - 1);
last_y_span = &g_array_index (tex->slice_y_spans, CoglTexSliceSpan,
tex->slice_y_spans->len - 1);
if (last_x_span->waste > 0 || last_y_span->waste > 0)
{
gint bpp = _cogl_get_format_bpp (tex->bitmap.format);
CoglTexSliceSpan *first_x_span
= &g_array_index (tex->slice_x_spans, CoglTexSliceSpan, 0);
CoglTexSliceSpan *first_y_span
= &g_array_index (tex->slice_y_spans, CoglTexSliceSpan, 0);
guint right_size = first_y_span->size * last_x_span->waste;
guint bottom_size = first_x_span->size * last_y_span->waste;
waste_buf = g_malloc (MAX (right_size, bottom_size) * bpp);
}
return waste_buf;
}
static gboolean
_cogl_texture_upload_to_gl (CoglTexture *tex)
{
CoglTexSliceSpan *x_span;
CoglTexSliceSpan *y_span;
GLuint gl_handle;
gint bpp;
gint x,y;
guchar *waste_buf;
bpp = _cogl_get_format_bpp (tex->bitmap.format);
waste_buf = _cogl_texture_allocate_waste_buffer (tex);
/* Iterate vertical slices */
for (y = 0; y < tex->slice_y_spans->len; ++y)
{
y_span = &g_array_index (tex->slice_y_spans, CoglTexSliceSpan, y);
/* Iterate horizontal slices */
for (x = 0; x < tex->slice_x_spans->len; ++x)
{
gint slice_num = y * tex->slice_x_spans->len + x;
x_span = &g_array_index (tex->slice_x_spans, CoglTexSliceSpan, x);
/* Pick the gl texture object handle */
gl_handle = g_array_index (tex->slice_gl_handles, GLuint, slice_num);
_cogl_texture_driver_upload_subregion_to_gl (
tex,
x_span->start, /* src x */
y_span->start, /* src y */
0, /* dst x */
0, /* dst y */
x_span->size - x_span->waste, /* width */
y_span->size - y_span->waste, /* height */
&tex->bitmap,
tex->gl_format,
tex->gl_type,
gl_handle);
/* Keep a copy of the first pixel if needed */
if (tex->first_pixels)
{
memcpy (tex->first_pixels[slice_num].data,
tex->bitmap.data + x_span->start * bpp
+ y_span->start * tex->bitmap.rowstride,
bpp);
tex->first_pixels[slice_num].gl_format = tex->gl_format;
tex->first_pixels[slice_num].gl_type = tex->gl_type;
}
/* Fill the waste with a copies of the rightmost pixels */
if (x_span->waste > 0)
{
const guchar *src = tex->bitmap.data
+ y_span->start * tex->bitmap.rowstride
+ (x_span->start + x_span->size - x_span->waste - 1) * bpp;
guchar *dst = waste_buf;
guint wx, wy;
for (wy = 0; wy < y_span->size - y_span->waste; wy++)
{
for (wx = 0; wx < x_span->waste; wx++)
{
memcpy (dst, src, bpp);
dst += bpp;
}
src += tex->bitmap.rowstride;
}
_cogl_texture_driver_prep_gl_for_pixels_upload (
x_span->waste * bpp,
bpp);
GE( glTexSubImage2D (tex->gl_target, 0,
x_span->size - x_span->waste,
0,
x_span->waste,
y_span->size - y_span->waste,
tex->gl_format, tex->gl_type,
waste_buf) );
}
if (y_span->waste > 0)
{
const guchar *src = tex->bitmap.data
+ ((y_span->start + y_span->size - y_span->waste - 1)
* tex->bitmap.rowstride)
+ x_span->start * bpp;
guchar *dst = waste_buf;
guint wy, wx;
for (wy = 0; wy < y_span->waste; wy++)
{
memcpy (dst, src, (x_span->size - x_span->waste) * bpp);
dst += (x_span->size - x_span->waste) * bpp;
for (wx = 0; wx < x_span->waste; wx++)
{
memcpy (dst, dst - bpp, bpp);
dst += bpp;
}
}
_cogl_texture_driver_prep_gl_for_pixels_upload (
x_span->size * bpp,
bpp);
GE( glTexSubImage2D (tex->gl_target, 0,
0,
y_span->size - y_span->waste,
x_span->size,
y_span->waste,
tex->gl_format, tex->gl_type,
waste_buf) );
}
}
}
if (waste_buf)
g_free (waste_buf);
tex->mipmaps_dirty = TRUE;
return TRUE;
}
static gboolean
_cogl_texture_upload_subregion_to_gl (CoglTexture *tex,
gint src_x,
gint src_y,
gint dst_x,
gint dst_y,
gint width,
gint height,
CoglBitmap *source_bmp,
GLuint source_gl_format,
GLuint source_gl_type)
{
CoglTexSliceSpan *x_span;
CoglTexSliceSpan *y_span;
gint bpp;
CoglSpanIter x_iter;
CoglSpanIter y_iter;
GLuint gl_handle;
gint source_x = 0, source_y = 0;
gint inter_w = 0, inter_h = 0;
gint local_x = 0, local_y = 0;
guchar *waste_buf;
bpp = _cogl_get_format_bpp (source_bmp->format);
waste_buf = _cogl_texture_allocate_waste_buffer (tex);
/* Iterate vertical spans */
for (source_y = src_y,
_cogl_span_iter_begin (&y_iter, tex->slice_y_spans,
tex->bitmap.height, (float)(dst_y),
(float)(dst_y + height));
!_cogl_span_iter_end (&y_iter);
_cogl_span_iter_next (&y_iter),
source_y += inter_h )
{
/* Discard slices out of the subregion early */
if (!y_iter.intersects)
{
inter_h = 0;
continue;
}
y_span = &g_array_index (tex->slice_y_spans, CoglTexSliceSpan,
y_iter.index);
/* Iterate horizontal spans */
for (source_x = src_x,
_cogl_span_iter_begin (&x_iter, tex->slice_x_spans,
tex->bitmap.width, (float)(dst_x),
(float)(dst_x + width));
!_cogl_span_iter_end (&x_iter);
_cogl_span_iter_next (&x_iter),
source_x += inter_w )
{
gint slice_num;
/* Discard slices out of the subregion early */
if (!x_iter.intersects)
{
inter_w = 0;
continue;
}
x_span = &g_array_index (tex->slice_x_spans, CoglTexSliceSpan,
x_iter.index);
/* Pick intersection width and height */
inter_w = (x_iter.intersect_end - x_iter.intersect_start);
inter_h = (y_iter.intersect_end - y_iter.intersect_start);
/* Localize intersection top-left corner to slice*/
local_x = (x_iter.intersect_start - x_iter.pos);
local_y = (y_iter.intersect_start - y_iter.pos);
slice_num = y_iter.index * tex->slice_x_spans->len + x_iter.index;
/* Pick slice GL handle */
gl_handle = g_array_index (tex->slice_gl_handles, GLuint, slice_num);
_cogl_texture_driver_upload_subregion_to_gl (tex,
source_x,
source_y,
local_x, /* dst x */
local_y, /* dst x */
inter_w, /* width */
inter_h, /* height */
source_bmp,
source_gl_format,
source_gl_type,
gl_handle);
/* Keep a copy of the first pixel if needed */
if (tex->first_pixels && local_x == 0 && local_y == 0)
{
memcpy (tex->first_pixels[slice_num].data,
source_bmp->data + source_x * bpp
+ source_y * source_bmp->rowstride,
bpp);
tex->first_pixels[slice_num].gl_format = source_gl_format;
tex->first_pixels[slice_num].gl_type = source_gl_type;
}
/* If the x_span is sliced and the upload touches the
rightmost pixels then fill the waste with copies of the
pixels */
if (x_span->waste > 0
&& local_x < x_span->size - x_span->waste
&& local_x + inter_w >= x_span->size - x_span->waste)
{
const guchar *src;
guchar *dst;
guint wx, wy;
src = source_bmp->data
+ (src_y + ((int)y_iter.intersect_start)
- dst_y)
* source_bmp->rowstride
+ (src_x + x_span->start + x_span->size - x_span->waste
- dst_x - 1)
* bpp;
dst = waste_buf;
for (wy = 0; wy < inter_h; wy++)
{
for (wx = 0; wx < x_span->waste; wx++)
{
memcpy (dst, src, bpp);
dst += bpp;
}
src += source_bmp->rowstride;
}
_cogl_texture_driver_prep_gl_for_pixels_upload (
x_span->waste * bpp,
bpp);
GE( glTexSubImage2D (tex->gl_target, 0,
x_span->size - x_span->waste,
local_y,
x_span->waste,
inter_h,
source_gl_format,
source_gl_type,
waste_buf) );
}
/* same for the bottom-most pixels */
if (y_span->waste > 0
&& local_y < y_span->size - y_span->waste
&& local_y + inter_h >= y_span->size - y_span->waste)
{
const guchar *src;
guchar *dst;
guint wy, wx;
guint copy_width;
src = source_bmp->data
+ (src_x + ((int)x_iter.intersect_start)
- dst_x)
* bpp
+ (src_y + y_span->start + y_span->size - y_span->waste
- dst_y - 1)
* source_bmp->rowstride;
dst = waste_buf;
if (local_x + inter_w >= x_span->size - x_span->waste)
copy_width = x_span->size - local_x;
else
copy_width = inter_w;
for (wy = 0; wy < y_span->waste; wy++)
{
memcpy (dst, src, inter_w * bpp);
dst += inter_w * bpp;
for (wx = inter_w; wx < copy_width; wx++)
{
memcpy (dst, dst - bpp, bpp);
dst += bpp;
}
}
_cogl_texture_driver_prep_gl_for_pixels_upload (
copy_width * bpp,
bpp);
GE( glTexSubImage2D (tex->gl_target, 0,
local_x,
y_span->size - y_span->waste,
copy_width,
y_span->waste,
source_gl_format,
source_gl_type,
waste_buf) );
}
}
}
if (waste_buf)
g_free (waste_buf);
tex->mipmaps_dirty = TRUE;
return TRUE;
}
static gint
_cogl_rect_slices_for_size (gint size_to_fill,
gint max_span_size,
gint max_waste,
GArray *out_spans)
{
gint n_spans = 0;
CoglTexSliceSpan span;
/* Init first slice span */
span.start = 0;
span.size = max_span_size;
span.waste = 0;
/* Repeat until whole area covered */
while (size_to_fill >= span.size)
{
/* Add another slice span of same size */
if (out_spans) g_array_append_val (out_spans, span);
span.start += span.size;
size_to_fill -= span.size;
n_spans++;
}
/* Add one last smaller slice span */
if (size_to_fill > 0)
{
span.size = size_to_fill;
if (out_spans) g_array_append_val (out_spans, span);
n_spans++;
}
return n_spans;
}
static gint
_cogl_pot_slices_for_size (gint size_to_fill,
gint max_span_size,
gint max_waste,
GArray *out_spans)
{
gint n_spans = 0;
CoglTexSliceSpan span;
/* Init first slice span */
span.start = 0;
span.size = max_span_size;
span.waste = 0;
/* Fix invalid max_waste */
if (max_waste < 0)
max_waste = 0;
while (TRUE)
{
/* Is the whole area covered? */
if (size_to_fill > span.size)
{
/* Not yet - add a span of this size */
if (out_spans)
g_array_append_val (out_spans, span);
span.start += span.size;
size_to_fill -= span.size;
n_spans++;
}
else if (span.size - size_to_fill <= max_waste)
{
/* Yes and waste is small enough */
span.waste = span.size - size_to_fill;
if (out_spans)
g_array_append_val (out_spans, span);
return ++n_spans;
}
else
{
/* Yes but waste is too large */
while (span.size - size_to_fill > max_waste)
{
span.size /= 2;
g_assert (span.size > 0);
}
}
}
/* Can't get here */
return 0;
}
void
_cogl_texture_set_wrap_mode_parameter (CoglHandle handle,
GLenum wrap_mode)
{
CoglTexture *tex = _cogl_texture_pointer_from_handle (handle);
/* Only set the wrap mode if it's different from the current
value to avoid too many GL calls */
if (tex->wrap_mode != wrap_mode)
{
int i;
/* Any queued texture rectangles may be depending on the previous
* wrap mode... */
_cogl_journal_flush ();
for (i = 0; i < tex->slice_gl_handles->len; i++)
{
GLuint texnum = g_array_index (tex->slice_gl_handles, GLuint, i);
GE( glBindTexture (tex->gl_target, texnum) );
GE( glTexParameteri (tex->gl_target, GL_TEXTURE_WRAP_S, wrap_mode) );
GE( glTexParameteri (tex->gl_target, GL_TEXTURE_WRAP_T, wrap_mode) );
}
tex->wrap_mode = wrap_mode;
}
}
static gboolean
_cogl_texture_slices_create (CoglTexture *tex)
{
gint bpp;
gint max_width;
gint max_height;
GLuint *gl_handles;
gint n_x_slices;
gint n_y_slices;
gint n_slices;
gint x, y;
CoglTexSliceSpan *x_span;
CoglTexSliceSpan *y_span;
const GLfloat transparent_color[4] = { 0x00, 0x00, 0x00, 0x00 };
gint (*slices_for_size) (gint, gint, gint, GArray*);
bpp = _cogl_get_format_bpp (tex->bitmap.format);
/* Initialize size of largest slice according to supported features */
if (cogl_features_available (COGL_FEATURE_TEXTURE_NPOT))
{
max_width = tex->bitmap.width;
max_height = tex->bitmap.height;
tex->gl_target = GL_TEXTURE_2D;
slices_for_size = _cogl_rect_slices_for_size;
}
else
{
max_width = cogl_util_next_p2 (tex->bitmap.width);
max_height = cogl_util_next_p2 (tex->bitmap.height);
tex->gl_target = GL_TEXTURE_2D;
slices_for_size = _cogl_pot_slices_for_size;
}
/* Negative number means no slicing forced by the user */
if (tex->max_waste <= -1)
{
CoglTexSliceSpan span;
/* Check if size supported else bail out */
if (!_cogl_texture_driver_size_supported (tex->gl_target,
tex->gl_format,
tex->gl_type,
max_width,
max_height))
{
return FALSE;
}
n_x_slices = 1;
n_y_slices = 1;
/* Init span arrays */
tex->slice_x_spans = g_array_sized_new (FALSE, FALSE,
sizeof (CoglTexSliceSpan),
1);
tex->slice_y_spans = g_array_sized_new (FALSE, FALSE,
sizeof (CoglTexSliceSpan),
1);
/* Add a single span for width and height */
span.start = 0;
span.size = max_width;
span.waste = max_width - tex->bitmap.width;
g_array_append_val (tex->slice_x_spans, span);
span.size = max_height;
span.waste = max_height - tex->bitmap.height;
g_array_append_val (tex->slice_y_spans, span);
}
else
{
/* Decrease the size of largest slice until supported by GL */
while (!_cogl_texture_driver_size_supported (tex->gl_target,
tex->gl_format,
tex->gl_type,
max_width,
max_height))
{
/* Alternate between width and height */
if (max_width > max_height)
max_width /= 2;
else
max_height /= 2;
if (max_width == 0 || max_height == 0)
return FALSE;
}
/* Determine the slices required to cover the bitmap area */
n_x_slices = slices_for_size (tex->bitmap.width,
max_width, tex->max_waste,
NULL);
n_y_slices = slices_for_size (tex->bitmap.height,
max_height, tex->max_waste,
NULL);
/* Init span arrays with reserved size */
tex->slice_x_spans = g_array_sized_new (FALSE, FALSE,
sizeof (CoglTexSliceSpan),
n_x_slices);
tex->slice_y_spans = g_array_sized_new (FALSE, FALSE,
sizeof (CoglTexSliceSpan),
n_y_slices);
/* Fill span arrays with info */
slices_for_size (tex->bitmap.width,
max_width, tex->max_waste,
tex->slice_x_spans);
slices_for_size (tex->bitmap.height,
max_height, tex->max_waste,
tex->slice_y_spans);
}
/* Init and resize GL handle array */
n_slices = n_x_slices * n_y_slices;
tex->slice_gl_handles = g_array_sized_new (FALSE, FALSE,
sizeof (GLuint),
n_slices);
g_array_set_size (tex->slice_gl_handles, n_slices);
/* Allocate some space to store a copy of the first pixel of each
slice. This is only needed if glGenerateMipmap (which is part of
the FBO extension) is not available */
if (cogl_features_available (COGL_FEATURE_OFFSCREEN))
tex->first_pixels = NULL;
else
tex->first_pixels = g_new (CoglTexturePixel, n_slices);
/* Wrap mode not yet set */
tex->wrap_mode = GL_FALSE;
/* Generate a "working set" of GL texture objects
* (some implementations might supported faster
* re-binding between textures inside a set) */
gl_handles = (GLuint*) tex->slice_gl_handles->data;
GE( glGenTextures (n_slices, gl_handles) );
/* Init each GL texture object */
for (y = 0; y < n_y_slices; ++y)
{
y_span = &g_array_index (tex->slice_y_spans, CoglTexSliceSpan, y);
for (x = 0; x < n_x_slices; ++x)
{
x_span = &g_array_index (tex->slice_x_spans, CoglTexSliceSpan, x);
COGL_NOTE (TEXTURE, "CREATE SLICE (%d,%d)\tsize (%d,%d)",
x, y,
x_span->size - x_span->waste,
y_span->size - y_span->waste);
/* Setup texture parameters */
GE( _cogl_texture_driver_bind (tex->gl_target,
gl_handles[y * n_x_slices + x],
tex->gl_intformat) );
_cogl_texture_driver_try_setting_gl_border_color (tex->gl_target,
transparent_color);
/* Pass NULL data to init size and internal format */
GE( glTexImage2D (tex->gl_target, 0, tex->gl_intformat,
x_span->size, y_span->size, 0,
tex->gl_format, tex->gl_type, 0) );
}
}
return TRUE;
}
static void
_cogl_texture_slices_free (CoglTexture *tex)
{
if (tex->slice_x_spans != NULL)
g_array_free (tex->slice_x_spans, TRUE);
if (tex->slice_y_spans != NULL)
g_array_free (tex->slice_y_spans, TRUE);
if (tex->slice_gl_handles != NULL)
{
if (tex->is_foreign == FALSE)
{
GE( glDeleteTextures (tex->slice_gl_handles->len,
(GLuint*) tex->slice_gl_handles->data) );
}
g_array_free (tex->slice_gl_handles, TRUE);
}
if (tex->first_pixels != NULL)
g_free (tex->first_pixels);
}
gboolean
_cogl_texture_span_has_waste (CoglTexture *tex,
gint x_span_index,
gint y_span_index)
{
CoglTexSliceSpan *x_span;
CoglTexSliceSpan *y_span;
x_span = &g_array_index (tex->slice_x_spans, CoglTexSliceSpan, x_span_index);
y_span = &g_array_index (tex->slice_y_spans, CoglTexSliceSpan, y_span_index);
return (x_span->waste || y_span->waste) ? TRUE : FALSE;
}
static gboolean
_cogl_texture_bitmap_prepare (CoglTexture *tex,
CoglPixelFormat internal_format)
{
CoglBitmap new_bitmap;
CoglPixelFormat new_data_format;
gboolean success;
/* Was there any internal conversion requested?
* By default Cogl will use a premultiplied internal format. Later we will
* add control over this. */
if (internal_format == COGL_PIXEL_FORMAT_ANY)
{
if ((tex->bitmap.format & COGL_A_BIT) &&
tex->bitmap.format != COGL_PIXEL_FORMAT_A_8)
internal_format = tex->bitmap.format | COGL_PREMULT_BIT;
else
internal_format = tex->bitmap.format;
}
/* Find closest format accepted by GL */
new_data_format = _cogl_pixel_format_to_gl (internal_format,
&tex->gl_intformat,
&tex->gl_format,
&tex->gl_type);
/* Convert to internal format */
if (new_data_format != tex->bitmap.format)
{
success = _cogl_bitmap_convert_and_premult (&tex->bitmap,
&new_bitmap,
new_data_format);
if (!success)
return FALSE;
/* Update texture with new data */
_cogl_texture_bitmap_swap (tex, &new_bitmap);
}
return TRUE;
}
static void
_cogl_texture_free (CoglTexture *tex)
{
/* Frees texture resources but its handle is not
released! Do that separately before this! */
_cogl_texture_bitmap_free (tex);
_cogl_texture_slices_free (tex);
g_free (tex);
}
CoglHandle
cogl_texture_new_with_size (guint width,
guint height,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture *tex;
gint bpp;
gint rowstride;
/* Since no data, we need some internal format */
if (internal_format == COGL_PIXEL_FORMAT_ANY)
return COGL_INVALID_HANDLE;
/* Rowstride from width */
bpp = _cogl_get_format_bpp (internal_format);
rowstride = width * bpp;
/* Init texture with empty bitmap */
tex = (CoglTexture*) g_malloc (sizeof (CoglTexture));
tex->is_foreign = FALSE;
tex->auto_mipmap = (flags & COGL_TEXTURE_NO_AUTO_MIPMAP) == 0;
tex->mipmaps_dirty = TRUE;
tex->first_pixels = NULL;
tex->bitmap.width = width;
tex->bitmap.height = height;
tex->bitmap.format = internal_format;
tex->bitmap.rowstride = rowstride;
tex->bitmap.data = NULL;
tex->bitmap_owner = FALSE;
tex->slice_x_spans = NULL;
tex->slice_y_spans = NULL;
tex->slice_gl_handles = NULL;
if (flags & COGL_TEXTURE_NO_SLICING)
tex->max_waste = -1;
else
tex->max_waste = COGL_TEXTURE_MAX_WASTE;
/* Unknown filter */
tex->min_filter = GL_FALSE;
tex->mag_filter = GL_FALSE;
/* Find closest GL format match */
tex->bitmap.format =
_cogl_pixel_format_to_gl (internal_format,
&tex->gl_intformat,
&tex->gl_format,
&tex->gl_type);
/* Create slices for the given format and size */
if (!_cogl_texture_slices_create (tex))
{
_cogl_texture_free (tex);
return COGL_INVALID_HANDLE;
}
return _cogl_texture_handle_new (tex);
}
CoglHandle
cogl_texture_new_from_data (guint width,
guint height,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
guint rowstride,
const guchar *data)
{
CoglTexture *tex;
gint bpp;
if (format == COGL_PIXEL_FORMAT_ANY)
return COGL_INVALID_HANDLE;
if (data == NULL)
return COGL_INVALID_HANDLE;
/* Rowstride from width if not given */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0) rowstride = width * bpp;
/* Create new texture and fill with given data */
tex = (CoglTexture*) g_malloc (sizeof (CoglTexture));
tex->is_foreign = FALSE;
tex->auto_mipmap = (flags & COGL_TEXTURE_NO_AUTO_MIPMAP) == 0;
tex->mipmaps_dirty = TRUE;
tex->first_pixels = NULL;
tex->bitmap.width = width;
tex->bitmap.height = height;
tex->bitmap.data = (guchar*)data;
tex->bitmap.format = format;
tex->bitmap.rowstride = rowstride;
tex->bitmap_owner = FALSE;
tex->slice_x_spans = NULL;
tex->slice_y_spans = NULL;
tex->slice_gl_handles = NULL;
if (flags & COGL_TEXTURE_NO_SLICING)
tex->max_waste = -1;
else
tex->max_waste = COGL_TEXTURE_MAX_WASTE;
/* Unknown filter */
tex->min_filter = GL_FALSE;
tex->mag_filter = GL_FALSE;
/* FIXME: If upload fails we should set some kind of
* error flag but still return texture handle (this
* is to keep the behavior equal to _new_from_file;
* see below) */
if (!_cogl_texture_bitmap_prepare (tex, internal_format))
{
_cogl_texture_free (tex);
return COGL_INVALID_HANDLE;
}
if (!_cogl_texture_slices_create (tex))
{
_cogl_texture_free (tex);
return COGL_INVALID_HANDLE;
}
if (!_cogl_texture_upload_to_gl (tex))
{
_cogl_texture_free (tex);
return COGL_INVALID_HANDLE;
}
_cogl_texture_bitmap_free (tex);
return _cogl_texture_handle_new (tex);
}
CoglHandle
cogl_texture_new_from_bitmap (CoglHandle bmp_handle,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTexture *tex;
CoglBitmap *bmp = (CoglBitmap *)bmp_handle;
g_return_val_if_fail (bmp_handle != COGL_INVALID_HANDLE, COGL_INVALID_HANDLE);
/* Create new texture and fill with loaded data */
tex = (CoglTexture*) g_malloc ( sizeof (CoglTexture));
tex->is_foreign = FALSE;
tex->auto_mipmap = (flags & COGL_TEXTURE_NO_AUTO_MIPMAP) == 0;
tex->mipmaps_dirty = TRUE;
tex->first_pixels = NULL;
tex->bitmap = *bmp;
tex->bitmap_owner = FALSE;
tex->slice_x_spans = NULL;
tex->slice_y_spans = NULL;
tex->slice_gl_handles = NULL;
if (flags & COGL_TEXTURE_NO_SLICING)
tex->max_waste = -1;
else
tex->max_waste = COGL_TEXTURE_MAX_WASTE;
/* Unknown filter */
tex->min_filter = GL_FALSE;
tex->mag_filter = GL_FALSE;
/* FIXME: If upload fails we should set some kind of
* error flag but still return texture handle if the
* user decides to destroy another texture and upload
* this one instead (reloading from file is not needed
* in that case). As a rule then, everytime a valid
* CoglHandle is returned, it should also be destroyed
* with cogl_handle_unref at some point! */
if (!_cogl_texture_bitmap_prepare (tex, internal_format))
{
_cogl_texture_free (tex);
return COGL_INVALID_HANDLE;
}
if (!_cogl_texture_slices_create (tex))
{
_cogl_texture_free (tex);
return COGL_INVALID_HANDLE;
}
if (!_cogl_texture_upload_to_gl (tex))
{
_cogl_texture_free (tex);
return COGL_INVALID_HANDLE;
}
_cogl_texture_bitmap_free (tex);
return _cogl_texture_handle_new (tex);
}
CoglHandle
cogl_texture_new_from_file (const gchar *filename,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
GError **error)
{
CoglHandle bmp;
CoglHandle handle;
g_return_val_if_fail (error == NULL || *error == NULL, COGL_INVALID_HANDLE);
bmp = cogl_bitmap_new_from_file (filename, error);
if (bmp == COGL_INVALID_HANDLE)
return COGL_INVALID_HANDLE;
handle = cogl_texture_new_from_bitmap (bmp, flags, internal_format);
cogl_handle_unref (bmp);
return handle;
}
CoglHandle
cogl_texture_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format)
{
/* NOTE: width, height and internal format are not queriable
in GLES, hence such a function prototype. However, for
OpenGL they are still queried from the texture for improved
robustness and for completeness in case one day GLES gains
support for them.
*/
GLenum gl_error = 0;
GLboolean gl_istexture;
GLint gl_compressed = GL_FALSE;
GLint gl_int_format = 0;
GLint gl_width = 0;
GLint gl_height = 0;
GLint gl_gen_mipmap;
guint bpp;
CoglTexture *tex;
CoglTexSliceSpan x_span;
CoglTexSliceSpan y_span;
if (!_cogl_texture_driver_allows_foreign_gl_target (gl_target))
return COGL_INVALID_HANDLE;
/* Make sure it is a valid GL texture object */
gl_istexture = glIsTexture (gl_handle);
if (gl_istexture == GL_FALSE)
return COGL_INVALID_HANDLE;
/* Make sure binding succeeds */
gl_error = glGetError ();
glBindTexture (gl_target, gl_handle);
if (glGetError () != GL_NO_ERROR)
return COGL_INVALID_HANDLE;
/* Obtain texture parameters
(only level 0 we are interested in) */
#if HAVE_COGL_GL
GE( glGetTexLevelParameteriv (gl_target, 0,
GL_TEXTURE_COMPRESSED,
&gl_compressed) );
GE( glGetTexLevelParameteriv (gl_target, 0,
GL_TEXTURE_INTERNAL_FORMAT,
&gl_int_format) );
GE( glGetTexLevelParameteriv (gl_target, 0,
GL_TEXTURE_WIDTH,
&gl_width) );
GE( glGetTexLevelParameteriv (gl_target, 0,
GL_TEXTURE_HEIGHT,
&gl_height) );
#else
gl_width = width + x_pot_waste;
gl_height = height + y_pot_waste;
#endif
GE( glGetTexParameteriv (gl_target,
GL_GENERATE_MIPMAP,
&gl_gen_mipmap) );
/* Validate width and height */
if (gl_width <= 0 || gl_height <= 0)
return COGL_INVALID_HANDLE;
/* Validate pot waste */
if (x_pot_waste < 0 || x_pot_waste >= gl_width ||
y_pot_waste < 0 || y_pot_waste >= gl_height)
return COGL_INVALID_HANDLE;
/* Compressed texture images not supported */
if (gl_compressed == GL_TRUE)
return COGL_INVALID_HANDLE;
/* Try and match to a cogl format */
if (!_cogl_pixel_format_from_gl_internal (gl_int_format, &format))
return COGL_INVALID_HANDLE;
/* Create new texture */
tex = (CoglTexture *) g_malloc (sizeof (CoglTexture));
/* Setup bitmap info */
tex->is_foreign = TRUE;
tex->auto_mipmap = (gl_gen_mipmap == GL_TRUE) ? TRUE : FALSE;
tex->mipmaps_dirty = TRUE;
tex->first_pixels = NULL;
bpp = _cogl_get_format_bpp (format);
tex->bitmap.format = format;
tex->bitmap.width = gl_width - x_pot_waste;
tex->bitmap.height = gl_height - y_pot_waste;
tex->bitmap.rowstride = tex->bitmap.width * bpp;
tex->bitmap_owner = FALSE;
tex->gl_target = gl_target;
tex->gl_intformat = gl_int_format;
tex->gl_format = gl_int_format;
tex->gl_type = GL_UNSIGNED_BYTE;
/* Unknown filter */
tex->min_filter = GL_FALSE;
tex->mag_filter = GL_FALSE;
tex->max_waste = 0;
/* Wrap mode not yet set */
tex->wrap_mode = GL_FALSE;
/* Create slice arrays */
tex->slice_x_spans =
g_array_sized_new (FALSE, FALSE,
sizeof (CoglTexSliceSpan), 1);
tex->slice_y_spans =
g_array_sized_new (FALSE, FALSE,
sizeof (CoglTexSliceSpan), 1);
tex->slice_gl_handles =
g_array_sized_new (FALSE, FALSE,
sizeof (GLuint), 1);
/* Store info for a single slice */
x_span.start = 0;
x_span.size = gl_width;
x_span.waste = x_pot_waste;
g_array_append_val (tex->slice_x_spans, x_span);
y_span.start = 0;
y_span.size = gl_height;
y_span.waste = y_pot_waste;
g_array_append_val (tex->slice_y_spans, y_span);
g_array_append_val (tex->slice_gl_handles, gl_handle);
tex->first_pixels = NULL;
return _cogl_texture_handle_new (tex);
}
guint
cogl_texture_get_width (CoglHandle handle)
{
CoglTexture *tex;
if (!cogl_is_texture (handle))
return 0;
tex = _cogl_texture_pointer_from_handle (handle);
return tex->bitmap.width;
}
guint
cogl_texture_get_height (CoglHandle handle)
{
CoglTexture *tex;
if (!cogl_is_texture (handle))
return 0;
tex = _cogl_texture_pointer_from_handle (handle);
return tex->bitmap.height;
}
CoglPixelFormat
cogl_texture_get_format (CoglHandle handle)
{
CoglTexture *tex;
if (!cogl_is_texture (handle))
return COGL_PIXEL_FORMAT_ANY;
tex = _cogl_texture_pointer_from_handle (handle);
return tex->bitmap.format;
}
guint
cogl_texture_get_rowstride (CoglHandle handle)
{
CoglTexture *tex;
if (!cogl_is_texture (handle))
return 0;
tex = _cogl_texture_pointer_from_handle (handle);
return tex->bitmap.rowstride;
}
gint
cogl_texture_get_max_waste (CoglHandle handle)
{
CoglTexture *tex;
if (!cogl_is_texture (handle))
return 0;
tex = _cogl_texture_pointer_from_handle (handle);
return tex->max_waste;
}
gboolean
cogl_texture_is_sliced (CoglHandle handle)
{
CoglTexture *tex;
if (!cogl_is_texture (handle))
return FALSE;
tex = _cogl_texture_pointer_from_handle (handle);
if (tex->slice_gl_handles == NULL)
return FALSE;
if (tex->slice_gl_handles->len <= 1)
return FALSE;
return TRUE;
}
gboolean
_cogl_texture_can_hardware_repeat (CoglHandle handle)
{
CoglTexture *tex = _cogl_texture_pointer_from_handle (handle);
CoglTexSliceSpan *x_span;
CoglTexSliceSpan *y_span;
#if HAVE_COGL_GL
if (tex->gl_target == GL_TEXTURE_RECTANGLE_ARB)
return FALSE;
#endif
x_span = &g_array_index (tex->slice_x_spans, CoglTexSliceSpan, 0);
y_span = &g_array_index (tex->slice_y_spans, CoglTexSliceSpan, 0);
return (x_span->waste || y_span->waste) ? FALSE : TRUE;
}
void
_cogl_texture_transform_coords_to_gl (CoglHandle handle,
float *s,
float *t)
{
CoglTexture *tex = _cogl_texture_pointer_from_handle (handle);
CoglTexSliceSpan *x_span;
CoglTexSliceSpan *y_span;
g_assert (!cogl_texture_is_sliced (tex));
/* Don't include the waste in the texture coordinates */
x_span = &g_array_index (tex->slice_x_spans, CoglTexSliceSpan, 0);
y_span = &g_array_index (tex->slice_y_spans, CoglTexSliceSpan, 0);
*s *= tex->bitmap.width / (float)x_span->size;
*t *= tex->bitmap.height / (float)y_span->size;
#if HAVE_COGL_GL
/* Denormalize texture coordinates for rectangle textures */
if (tex->gl_target == GL_TEXTURE_RECTANGLE_ARB)
{
*s *= x_span->size;
*t *= y_span->size;
}
#endif
}
GLenum
_cogl_texture_get_internal_gl_format (CoglHandle handle)
{
CoglTexture *tex = _cogl_texture_pointer_from_handle (handle);
return tex->gl_intformat;
}
gboolean
cogl_texture_get_gl_texture (CoglHandle handle,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
CoglTexture *tex;
if (!cogl_is_texture (handle))
return FALSE;
tex = _cogl_texture_pointer_from_handle (handle);
if (tex->slice_gl_handles == NULL)
return FALSE;
if (tex->slice_gl_handles->len < 1)
return FALSE;
if (out_gl_handle != NULL)
*out_gl_handle = g_array_index (tex->slice_gl_handles, GLuint, 0);
if (out_gl_target != NULL)
*out_gl_target = tex->gl_target;
return TRUE;
}
void
_cogl_texture_set_filters (CoglHandle handle,
GLenum min_filter,
GLenum mag_filter)
{
CoglTexture *tex;
GLuint gl_handle;
int i;
if (!cogl_is_texture (handle))
return;
tex = _cogl_texture_pointer_from_handle (handle);
/* Make sure slices were created */
if (tex->slice_gl_handles == NULL)
return;
if (min_filter == tex->min_filter
&& mag_filter == tex->mag_filter)
return;
/* Store new values */
tex->min_filter = min_filter;
tex->mag_filter = mag_filter;
/* Apply new filters to every slice */
for (i=0; i<tex->slice_gl_handles->len; ++i)
{
gl_handle = g_array_index (tex->slice_gl_handles, GLuint, i);
GE( glBindTexture (tex->gl_target, gl_handle) );
GE( glTexParameteri (tex->gl_target, GL_TEXTURE_MAG_FILTER,
tex->mag_filter) );
GE( glTexParameteri (tex->gl_target, GL_TEXTURE_MIN_FILTER,
tex->min_filter) );
}
}
void
_cogl_texture_ensure_mipmaps (CoglHandle handle)
{
CoglTexture *tex;
int i;
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (!cogl_is_texture (handle))
return;
tex = _cogl_texture_pointer_from_handle (handle);
/* Only update if the mipmaps are dirty */
if (!tex->auto_mipmap || !tex->mipmaps_dirty)
return;
/* Make sure slices were created */
if (tex->slice_gl_handles == NULL)
return;
/* Regenerate the mipmaps on every slice */
for (i = 0; i < tex->slice_gl_handles->len; i++)
{
GLuint gl_handle = g_array_index (tex->slice_gl_handles, GLuint, i);
GE( glBindTexture (tex->gl_target, gl_handle) );
/* glGenerateMipmap is defined in the FBO extension */
if (cogl_features_available (COGL_FEATURE_OFFSCREEN))
_cogl_texture_driver_gl_generate_mipmaps (tex->gl_target);
else if (tex->first_pixels)
{
CoglTexturePixel *pixel = tex->first_pixels + i;
/* Temporarily enable automatic mipmap generation and
re-upload the first pixel to cause a regeneration */
GE( glTexParameteri (tex->gl_target, GL_GENERATE_MIPMAP, GL_TRUE) );
GE( glTexSubImage2D (tex->gl_target, 0, 0, 0, 1, 1,
pixel->gl_format, pixel->gl_type,
pixel->data) );
GE( glTexParameteri (tex->gl_target, GL_GENERATE_MIPMAP, GL_FALSE) );
}
}
tex->mipmaps_dirty = FALSE;
}
gboolean
cogl_texture_set_region (CoglHandle handle,
gint src_x,
gint src_y,
gint dst_x,
gint dst_y,
guint dst_width,
guint dst_height,
gint width,
gint height,
CoglPixelFormat format,
guint rowstride,
const guchar *data)
{
CoglTexture *tex;
gint bpp;
CoglBitmap source_bmp;
CoglBitmap temp_bmp;
gboolean source_bmp_owner = FALSE;
CoglPixelFormat closest_format;
GLenum closest_gl_format;
GLenum closest_gl_type;
gboolean success;
/* Check if valid texture handle */
if (!cogl_is_texture (handle))
return FALSE;
tex = _cogl_texture_pointer_from_handle (handle);
/* Check for valid format */
if (format == COGL_PIXEL_FORMAT_ANY)
return FALSE;
/* Shortcut out early if the image is empty */
if (width == 0 || height == 0)
return TRUE;
/* Init source bitmap */
source_bmp.width = width;
source_bmp.height = height;
source_bmp.format = format;
source_bmp.data = (guchar*)data;
/* Rowstride from width if none specified */
bpp = _cogl_get_format_bpp (format);
source_bmp.rowstride = (rowstride == 0) ? width * bpp : rowstride;
/* Find closest format to internal that's supported by GL */
closest_format = _cogl_pixel_format_to_gl (tex->bitmap.format,
NULL, /* don't need */
&closest_gl_format,
&closest_gl_type);
/* If no direct match, convert */
if (closest_format != format)
{
/* Convert to required format */
success = _cogl_bitmap_convert_and_premult (&source_bmp,
&temp_bmp,
closest_format);
/* Swap bitmaps if succeeded */
if (!success) return FALSE;
source_bmp = temp_bmp;
source_bmp_owner = TRUE;
}
/* Send data to GL */
_cogl_texture_upload_subregion_to_gl (tex,
src_x, src_y,
dst_x, dst_y,
dst_width, dst_height,
&source_bmp,
closest_gl_format,
closest_gl_type);
/* Free data if owner */
if (source_bmp_owner)
g_free (source_bmp.data);
return TRUE;
}
gint
cogl_texture_get_data (CoglHandle handle,
CoglPixelFormat format,
guint rowstride,
guchar *data)
{
CoglTexture *tex;
gint bpp;
gint byte_size;
CoglPixelFormat closest_format;
gint closest_bpp;
GLenum closest_gl_format;
GLenum closest_gl_type;
CoglBitmap target_bmp;
CoglBitmap new_bmp;
gboolean success;
guchar *src;
guchar *dst;
gint y;
/* Check if valid texture handle */
if (!cogl_is_texture (handle))
return 0;
tex = _cogl_texture_pointer_from_handle (handle);
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = tex->bitmap.format;
/* Rowstride from texture width if none specified */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0) rowstride = tex->bitmap.width * bpp;
/* Return byte size if only that requested */
byte_size = tex->bitmap.height * rowstride;
if (data == NULL) return byte_size;
closest_format =
_cogl_texture_driver_find_best_gl_get_data_format (format,
&closest_gl_format,
&closest_gl_type);
closest_bpp = _cogl_get_format_bpp (closest_format);
/* Is the requested format supported? */
if (closest_format == format)
{
/* Target user data directly */
target_bmp = tex->bitmap;
target_bmp.format = format;
target_bmp.rowstride = rowstride;
target_bmp.data = data;
}
else
{
/* Target intermediate buffer */
target_bmp = tex->bitmap;
target_bmp.format = closest_format;
target_bmp.rowstride = target_bmp.width * closest_bpp;
target_bmp.data = (guchar*) g_malloc (target_bmp.height
* target_bmp.rowstride);
}
/* Retrieve data from slices */
_cogl_texture_driver_download_from_gl (tex, &target_bmp,
closest_gl_format,
closest_gl_type);
/* Was intermediate used? */
if (closest_format != format)
{
/* Convert to requested format */
success = _cogl_bitmap_convert_and_premult (&target_bmp,
&new_bmp,
format);
/* Free intermediate data and return if failed */
g_free (target_bmp.data);
if (!success) return 0;
/* Copy to user buffer */
for (y = 0; y < new_bmp.height; ++y)
{
src = new_bmp.data + y * new_bmp.rowstride;
dst = data + y * rowstride;
memcpy (dst, src, new_bmp.width);
}
/* Free converted data */
g_free (new_bmp.data);
}
return byte_size;
}
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