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mutter/clutter/cogl/gles/cogl-texture.c
Robert Bragg a9b011f3ed [premultiplication] Be more conservative with what data gets premultiplied 
We don't want to force texture data to be premultipled if the user
explicitly specifies a non premultiplied internal_format such as
COGL_PIXEL_FORMAT_RGBA_8888.  So now Cogl will only automatically
premultiply data when COGL_PIXEL_FORMAT_ANY is given for the
internal_format, or a premultiplied internal format such as
COGL_PIXEL_FORMAT_RGBA_8888_PRE is requested but non-premultiplied source
data is given.

This approach is consistent with OpenVG image formats which have already
influenced Cogl's pixel format semantics.
2009-06-11 14:17:53 +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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl.h"
#include "cogl-internal.h"
#include "cogl-util.h"
#include "cogl-bitmap-private.h"
#include "cogl-texture-private.h"
#include "cogl-material.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-gles2-wrapper.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
extern void _cogl_journal_flush (void);
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 *array,
float origin,
float cover_start,
float cover_end)
{
/* Copy info */
iter->index = 0;
iter->array = array;
iter->span = NULL;
iter->origin = origin;
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;
}
static void
prep_for_gl_pixels_upload (gint pixels_rowstride,
gint pixels_src_x,
gint pixels_src_y,
gint pixels_bpp)
{
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) );
}
static void
prep_for_gl_pixels_download (gint 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;
CoglBitmap slice_bmp;
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);
/* FIXME: might optimize by not copying to intermediate slice
bitmap when source rowstride = bpp * width and the texture
image is not sliced */
/* Setup temp bitmap for slice subregion */
slice_bmp.format = tex->bitmap.format;
slice_bmp.width = x_span->size - x_span->waste;
slice_bmp.height = y_span->size - y_span->waste;
slice_bmp.rowstride = bpp * slice_bmp.width;
slice_bmp.data = (guchar*) g_malloc (slice_bmp.rowstride *
slice_bmp.height);
/* Setup gl alignment to match rowstride and top-left corner */
prep_for_gl_pixels_upload (tex->bitmap.rowstride,
0,
0,
bpp);
/* Copy subregion data */
_cogl_bitmap_copy_subregion (&tex->bitmap,
&slice_bmp,
x_span->start,
y_span->start,
0, 0,
slice_bmp.width,
slice_bmp.height);
/* Keep a copy of the first pixel if needed */
if (tex->first_pixels)
{
memcpy (tex->first_pixels[slice_num].data,
slice_bmp.data,
bpp);
tex->first_pixels[slice_num].gl_format = tex->gl_format;
tex->first_pixels[slice_num].gl_type = tex->gl_type;
}
/* Upload new image data */
GE( cogl_gles2_wrapper_bind_texture (tex->gl_target, gl_handle,
tex->gl_intformat) );
GE( glTexSubImage2D (tex->gl_target, 0,
0,
0,
slice_bmp.width,
slice_bmp.height,
tex->gl_format, tex->gl_type,
slice_bmp.data) );
/* 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;
}
prep_for_gl_pixels_upload (x_span->waste * bpp,
0, /* src x */
0, /* src y */
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;
}
}
prep_for_gl_pixels_upload (x_span->size * bpp,
0, /* src x */
0, /* src y */
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) );
}
/* Free temp bitmap */
g_free (slice_bmp.data);
}
}
if (waste_buf)
g_free (waste_buf);
tex->mipmaps_dirty = TRUE;
return TRUE;
}
static void
_cogl_texture_draw_and_read (CoglTexture *tex,
CoglBitmap *target_bmp,
GLint *viewport)
{
gint bpp;
float rx1, ry1;
float rx2, ry2;
float tx1, ty1;
float tx2, ty2;
int bw, bh;
CoglBitmap rect_bmp;
CoglHandle handle;
handle = (CoglHandle) tex;
bpp = _cogl_get_format_bpp (COGL_PIXEL_FORMAT_RGBA_8888);
ry1 = 0; ry2 = 0;
ty1 = 0; ty2 = 0;
/* Walk Y axis until whole bitmap height consumed */
for (bh = tex->bitmap.height; bh > 0; bh -= viewport[3])
{
/* Rectangle Y coords */
ry1 = ry2;
ry2 += (bh < viewport[3]) ? bh : viewport[3];
/* Normalized texture Y coords */
ty1 = ty2;
ty2 = (ry2 / (float)tex->bitmap.height);
rx1 = 0; rx2 = 0;
tx1 = 0; tx2 = 0;
/* Walk X axis until whole bitmap width consumed */
for (bw = tex->bitmap.width; bw > 0; bw-=viewport[2])
{
/* Rectangle X coords */
rx1 = rx2;
rx2 += (bw < viewport[2]) ? bw : viewport[2];
/* Normalized texture X coords */
tx1 = tx2;
tx2 = (rx2 / (float)tex->bitmap.width);
/* Draw a portion of texture */
cogl_rectangle_with_texture_coords (0, 0,
rx2 - rx1,
ry2 - ry1,
tx1, ty1,
tx2, ty2);
/* Read into a temporary bitmap */
rect_bmp.format = COGL_PIXEL_FORMAT_RGBA_8888;
rect_bmp.width = rx2 - rx1;
rect_bmp.height = ry2 - ry1;
rect_bmp.rowstride = bpp * rect_bmp.width;
rect_bmp.data = (guchar*) g_malloc (rect_bmp.rowstride *
rect_bmp.height);
prep_for_gl_pixels_download (rect_bmp.rowstride);
GE( glReadPixels (viewport[0], viewport[1],
rect_bmp.width,
rect_bmp.height,
GL_RGBA, GL_UNSIGNED_BYTE,
rect_bmp.data) );
/* Copy to target bitmap */
_cogl_bitmap_copy_subregion (&rect_bmp,
target_bmp,
0,0,
rx1,ry1,
rect_bmp.width,
rect_bmp.height);
/* Free temp bitmap */
g_free (rect_bmp.data);
}
}
}
static gboolean
_cogl_texture_download_from_gl (CoglTexture *tex,
CoglBitmap *target_bmp,
GLuint target_gl_format,
GLuint target_gl_type)
{
gint bpp;
GLint viewport[4];
CoglBitmap alpha_bmp;
CoglHandle prev_source;
_COGL_GET_CONTEXT (ctx, FALSE);
bpp = _cogl_get_format_bpp (COGL_PIXEL_FORMAT_RGBA_8888);
/* Viewport needs to have some size and be inside the window for this */
GE( glGetIntegerv (GL_VIEWPORT, viewport) );
if (viewport[0] < 0 || viewport[1] < 0 ||
viewport[2] <= 0 || viewport[3] <= 0)
return FALSE;
/* Setup orthographic projection into current viewport
(0,0 in bottom-left corner to draw the texture
upside-down so we match the way glReadPixels works) */
_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
_cogl_current_matrix_push ();
_cogl_current_matrix_identity ();
_cogl_current_matrix_ortho (0, (float)(viewport[2]),
0, (float)(viewport[3]),
(float)(0),
(float)(100));
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_push ();
_cogl_current_matrix_identity ();
/* Direct copy operation */
if (ctx->texture_download_material == COGL_INVALID_HANDLE)
{
ctx->texture_download_material = cogl_material_new ();
cogl_material_set_blend (ctx->texture_download_material,
"RGBA = ADD (SRC_COLOR, 0)",
NULL);
}
prev_source = cogl_handle_ref (ctx->source_material);
cogl_set_source (ctx->texture_download_material);
cogl_material_set_layer (ctx->texture_download_material, 0, tex);
cogl_material_set_layer_combine (ctx->texture_download_material,
0, /* layer */
"RGBA = REPLACE (TEXTURE)",
NULL);
_cogl_texture_draw_and_read (tex, target_bmp, viewport);
/* Check whether texture has alpha and framebuffer not */
/* FIXME: For some reason even if ALPHA_BITS is 8, the framebuffer
still doesn't seem to have an alpha buffer. This might be just
a PowerVR issue.
GLint r_bits, g_bits, b_bits, a_bits;
GE( glGetIntegerv (GL_ALPHA_BITS, &a_bits) );
GE( glGetIntegerv (GL_RED_BITS, &r_bits) );
GE( glGetIntegerv (GL_GREEN_BITS, &g_bits) );
GE( glGetIntegerv (GL_BLUE_BITS, &b_bits) );
printf ("R bits: %d\n", r_bits);
printf ("G bits: %d\n", g_bits);
printf ("B bits: %d\n", b_bits);
printf ("A bits: %d\n", a_bits); */
if ((tex->bitmap.format & COGL_A_BIT)/* && a_bits == 0*/)
{
guchar *srcdata;
guchar *dstdata;
guchar *srcpixel;
guchar *dstpixel;
gint x,y;
/* Create temp bitmap for alpha values */
alpha_bmp.format = COGL_PIXEL_FORMAT_RGBA_8888;
alpha_bmp.width = target_bmp->width;
alpha_bmp.height = target_bmp->height;
alpha_bmp.rowstride = bpp * alpha_bmp.width;
alpha_bmp.data = (guchar*) g_malloc (alpha_bmp.rowstride *
alpha_bmp.height);
/* Draw alpha values into RGB channels */
cogl_material_set_layer_combine (ctx->texture_download_material,
0, /* layer */
"RGBA = REPLACE (TEXTURE[A])",
NULL);
_cogl_texture_draw_and_read (tex, &alpha_bmp, viewport);
/* Copy temp R to target A */
srcdata = alpha_bmp.data;
dstdata = target_bmp->data;
for (y=0; y<target_bmp->height; ++y)
{
for (x=0; x<target_bmp->width; ++x)
{
srcpixel = srcdata + x*bpp;
dstpixel = dstdata + x*bpp;
dstpixel[3] = srcpixel[0];
}
srcdata += alpha_bmp.rowstride;
dstdata += target_bmp->rowstride;
}
g_free (alpha_bmp.data);
}
/* Restore old state */
_cogl_set_current_matrix (COGL_MATRIX_PROJECTION);
_cogl_current_matrix_pop ();
_cogl_set_current_matrix (COGL_MATRIX_MODELVIEW);
_cogl_current_matrix_pop ();
/* restore the original material */
cogl_set_source (prev_source);
cogl_handle_unref (prev_source);
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;
CoglBitmap slice_bmp;
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,
0, (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,
0, (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);
/* FIXME: might optimize by not copying to intermediate slice
bitmap when source rowstride = bpp * width and the texture
image is not sliced */
/* Setup temp bitmap for slice subregion */
slice_bmp.format = tex->bitmap.format;
slice_bmp.width = inter_w;
slice_bmp.height = inter_h;
slice_bmp.rowstride = bpp * slice_bmp.width;
slice_bmp.data = (guchar*) g_malloc (slice_bmp.rowstride *
slice_bmp.height);
/* Setup gl alignment to match rowstride and top-left corner */
prep_for_gl_pixels_upload (slice_bmp.rowstride,
0, /* src x */
0, /* src y */
bpp);
/* Copy subregion data */
_cogl_bitmap_copy_subregion (source_bmp,
&slice_bmp,
source_x,
source_y,
0, 0,
slice_bmp.width,
slice_bmp.height);
/* 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,
slice_bmp.data, bpp);
tex->first_pixels[slice_num].gl_format = source_gl_format;
tex->first_pixels[slice_num].gl_type = source_gl_type;
}
/* Upload new image data */
GE( cogl_gles2_wrapper_bind_texture (tex->gl_target, gl_handle,
tex->gl_intformat) );
GE( glTexSubImage2D (tex->gl_target, 0,
local_x, local_y,
inter_w, inter_h,
source_gl_format,
source_gl_type,
slice_bmp.data) );
/* 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;
}
prep_for_gl_pixels_upload (x_span->waste * bpp,
0, /* src x */
0, /* src y */
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;
}
}
prep_for_gl_pixels_upload (copy_width * bpp,
0, /* src x */
0, /* src y */
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) );
}
/* Free temp bitmap */
g_free (slice_bmp.data);
}
}
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;
}
static gboolean
_cogl_texture_size_supported (GLenum gl_target,
GLenum gl_format,
GLenum gl_type,
int width,
int height)
{
return TRUE;
}
void
_cogl_texture_set_wrap_mode_parameter (CoglTexture *tex,
GLenum wrap_mode)
{
/* 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;
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_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_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 to 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);
#if COGL_DEBUG
printf ("CREATE SLICE (%d,%d)\n", x,y);
printf ("size: (%d x %d)\n",
x_span->size - x_span->waste,
y_span->size - y_span->waste);
#endif
/* Setup texture parameters */
GE( cogl_gles2_wrapper_bind_texture (tex->gl_target,
gl_handles[y * n_x_slices + x],
tex->gl_intformat) );
GE( glTexParameteri (tex->gl_target, GL_TEXTURE_WRAP_S,
tex->wrap_mode) );
GE( glTexParameteri (tex->gl_target, GL_TEXTURE_WRAP_T,
tex->wrap_mode) );
/* 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_pixel_format_from_gl_internal (GLenum gl_int_format,
CoglPixelFormat *out_format)
{
return TRUE;
}
static CoglPixelFormat
_cogl_pixel_format_to_gl (CoglPixelFormat format,
GLenum *out_glintformat,
GLenum *out_glformat,
GLenum *out_gltype)
{
CoglPixelFormat required_format;
GLenum glintformat = 0;
GLenum glformat = 0;
GLenum gltype = 0;
/* FIXME: check YUV support */
required_format = format;
/* Find GL equivalents */
switch (format & COGL_UNPREMULT_MASK)
{
case COGL_PIXEL_FORMAT_A_8:
glintformat = GL_ALPHA;
glformat = GL_ALPHA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_G_8:
glintformat = GL_LUMINANCE;
glformat = GL_LUMINANCE;
gltype = GL_UNSIGNED_BYTE;
break;
/* Just one 24-bit ordering supported */
case COGL_PIXEL_FORMAT_RGB_888:
case COGL_PIXEL_FORMAT_BGR_888:
glintformat = GL_RGB;
glformat = GL_RGB;
gltype = GL_UNSIGNED_BYTE;
required_format = COGL_PIXEL_FORMAT_RGB_888;
break;
/* Just one 32-bit ordering supported */
case COGL_PIXEL_FORMAT_RGBA_8888:
case COGL_PIXEL_FORMAT_BGRA_8888:
case COGL_PIXEL_FORMAT_ARGB_8888:
case COGL_PIXEL_FORMAT_ABGR_8888:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
required_format = COGL_PIXEL_FORMAT_RGBA_8888;
required_format |= (format & COGL_PREMULT_BIT);
break;
/* The following three types of channel ordering
* are always defined using system word byte
* ordering (even according to GLES spec) */
case COGL_PIXEL_FORMAT_RGB_565:
glintformat = GL_RGB;
glformat = GL_RGB;
gltype = GL_UNSIGNED_SHORT_5_6_5;
break;
case COGL_PIXEL_FORMAT_RGBA_4444:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case COGL_PIXEL_FORMAT_RGBA_5551:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_5_5_5_1;
break;
/* FIXME: check extensions for YUV support */
default:
break;
}
if (out_glintformat != NULL)
*out_glintformat = glintformat;
if (out_glformat != NULL)
*out_glformat = glformat;
if (out_gltype != NULL)
*out_gltype = gltype;
return required_format;
}
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;
}
/* 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;
/* 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 = TRUE;
bmp->data = NULL;
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;
/* Allow 2-dimensional textures only */
if (gl_target != GL_TEXTURE_2D)
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_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))
GE( cogl_wrap_glGenerateMipmap (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;
/* Find closest format that's supported by GL
(Can't use _cogl_pixel_format_to_gl since available formats
when reading pixels on GLES are severely limited) */
closest_format = COGL_PIXEL_FORMAT_RGBA_8888;
closest_gl_format = GL_RGBA;
closest_gl_type = GL_UNSIGNED_BYTE;
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_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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