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mutter/clutter/cogl/common/cogl-util.c
Robert Bragg a5cdfdfd87 [cogl-offscreen] Cleans up the cogl offscreen API and adds documentation 
There were several functions I believe no one is currently using that were
only implemented in the GL backend (cogl_offscreen_blit_region and
cogl_offscreen_blit) that have simply been removed so we have a chance to
think about design later with a real use case.

There was one nonsense function (cogl_offscreen_new_multisample) that
sounded exciting but in all cases it just returned COGL_INVALID_HANDLE
(though at least for GL it checked for multisampling support first!?)
it has also been removed.

The MASK draw buffer type has been removed. If we want to expose color
masking later then I think it at least would be nicer to have the mask be a
property that can be set on any draw buffer.

The cogl_draw_buffer and cogl_{push,pop}_draw_buffer function prototypes
have been moved up into cogl.h since they are for managing global Cogl state
and not for modifying or creating the actual offscreen buffers.

This also documents the API so for example desiphering the semantics of
cogl_offscreen_new_to_texture() should be a bit easier now.
2009-05-02 04:12:26 +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 <glib-object.h>
#include <gobject/gvaluecollector.h>
#include "cogl.h"
#include "cogl-fixed.h"
#include "cogl-internal.h"
#include "cogl-material.h"
#include "cogl-current-matrix.h"
#include "cogl-offscreen.h"
#include "cogl-shader.h"
#include "cogl-texture.h"
#include "cogl-types.h"
#include "cogl-handle.h"
#include "cogl-util.h"
/**
* cogl_util_next_p2:
* @a: Value to get the next power
*
* Calculates the next power greater than @a.
*
* Return value: The next power after @a.
*/
int
cogl_util_next_p2 (int a)
{
int rval=1;
while(rval < a)
rval <<= 1;
return rval;
}
/* gtypes */
CoglHandle
cogl_handle_ref (CoglHandle handle)
{
CoglHandleObject *obj = (CoglHandleObject *)handle;
g_return_val_if_fail (handle != COGL_INVALID_HANDLE, COGL_INVALID_HANDLE);
obj->ref_count++;
return handle;
}
void
cogl_handle_unref (CoglHandle handle)
{
CoglHandleObject *obj = (CoglHandleObject *)handle;
g_return_if_fail (handle != COGL_INVALID_HANDLE);
if (--obj->ref_count < 1)
{
void (*free_func)(void *obj);
COGL_HANDLE_DEBUG_FREE (obj);
free_func = obj->klass->virt_free;
free_func (obj);
}
}
GType
cogl_handle_get_type (void)
{
static GType our_type = 0;
if (G_UNLIKELY (our_type == 0))
our_type = g_boxed_type_register_static (g_intern_static_string ("CoglHandle"),
(GBoxedCopyFunc) cogl_handle_ref,
(GBoxedFreeFunc) cogl_handle_unref);
return our_type;
}
GType
cogl_pixel_format_get_type (void)
{
static GType gtype = 0;
if (G_UNLIKELY (gtype == 0))
{
static const GEnumValue values[] = {
{ COGL_PIXEL_FORMAT_ANY, "COGL_PIXEL_FORMAT_ANY", "any" },
{ COGL_PIXEL_FORMAT_A_8, "COGL_PIXEL_FORMAT_A_8", "a-8" },
{ COGL_PIXEL_FORMAT_RGB_565, "COGL_PIXEL_FORMAT_RGB_565", "rgb-565" },
{ COGL_PIXEL_FORMAT_RGBA_4444, "COGL_PIXEL_FORMAT_RGBA_4444", "rgba-4444" },
{ COGL_PIXEL_FORMAT_RGBA_5551, "COGL_PIXEL_FORMAT_RGBA_5551", "rgba-5551" },
{ COGL_PIXEL_FORMAT_YUV, "COGL_PIXEL_FORMAT_YUV", "yuv" },
{ COGL_PIXEL_FORMAT_G_8, "COGL_PIXEL_FORMAT_G_8", "g-8" },
{ COGL_PIXEL_FORMAT_RGB_888, "COGL_PIXEL_FORMAT_RGB_888", "rgb-888" },
{ COGL_PIXEL_FORMAT_BGR_888, "COGL_PIXEL_FORMAT_BGR_888", "bgr-888" },
{ COGL_PIXEL_FORMAT_RGBA_8888, "COGL_PIXEL_FORMAT_RGBA_8888", "rgba-8888" },
{ COGL_PIXEL_FORMAT_BGRA_8888, "COGL_PIXEL_FORMAT_BGRA_8888", "bgra-8888" },
{ COGL_PIXEL_FORMAT_ARGB_8888, "COGL_PIXEL_FORMAT_ARGB_8888", "argb-8888" },
{ COGL_PIXEL_FORMAT_ABGR_8888, "COGL_PIXEL_FORMAT_ABGR_8888", "abgr-8888" },
{ COGL_PIXEL_FORMAT_RGBA_8888_PRE, "COGL_PIXEL_FORMAT_RGBA_8888_PRE", "rgba-8888-pre" },
{ COGL_PIXEL_FORMAT_BGRA_8888_PRE, "COGL_PIXEL_FORMAT_BGRA_8888_PRE", "bgra-8888-pre" },
{ COGL_PIXEL_FORMAT_ARGB_8888_PRE, "COGL_PIXEL_FORMAT_ARGB_8888_PRE", "argb-8888-pre" },
{ COGL_PIXEL_FORMAT_ABGR_8888_PRE, "COGL_PIXEL_FORMAT_ABGR_8888_PRE", "abgr-8888-pre" },
{ COGL_PIXEL_FORMAT_RGBA_4444_PRE, "COGL_PIXEL_FORMAT_RGBA_4444_PRE", "rgba-4444-pre" },
{ COGL_PIXEL_FORMAT_RGBA_5551_PRE, "COGL_PIXEL_FORMAT_RGBA_5551_PRE", "rgba-5551-pre" },
{ 0, NULL, NULL }
};
gtype =
g_enum_register_static (g_intern_static_string ("CoglPixelFormat"),
values);
}
return gtype;
}
GType
cogl_feature_flags_get_type (void)
{
static GType gtype = 0;
if (G_UNLIKELY (gtype == 0))
{
static const GFlagsValue values[] = {
{ COGL_FEATURE_TEXTURE_RECTANGLE, "COGL_FEATURE_TEXTURE_RECTANGLE", "texture-rectangle" },
{ COGL_FEATURE_TEXTURE_NPOT, "COGL_FEATURE_TEXTURE_NPOT", "texture-npot" },
{ COGL_FEATURE_TEXTURE_YUV, "COGL_FEATURE_TEXTURE_YUV", "yuv" },
{ COGL_FEATURE_TEXTURE_READ_PIXELS, "COGL_FEATURE_TEXTURE_READ_PIXELS", "read-pixels" },
{ COGL_FEATURE_SHADERS_GLSL, "COGL_FEATURE_SHADERS_GLSL", "shaders-glsl" },
{ COGL_FEATURE_OFFSCREEN, "COGL_FEATURE_OFFSCREEN", "offscreen" },
{ COGL_FEATURE_OFFSCREEN_MULTISAMPLE, "COGL_FEATURE_OFFSCREEN_MULTISAMPLE", "offscreen-multisample" },
{ COGL_FEATURE_OFFSCREEN_BLIT, "COGL_FEATURE_OFFSCREEN_BLIT", "offscreen-blit" },
{ COGL_FEATURE_FOUR_CLIP_PLANES, "COGL_FEATURE_FOUR_CLIP_PLANES", "four-clip-planes" },
{ COGL_FEATURE_STENCIL_BUFFER, "COGL_FEATURE_STENCIL_BUFFER", "stencil-buffer" },
{ 0, NULL, NULL }
};
gtype =
g_flags_register_static (g_intern_static_string ("CoglFeatureFlags"),
values);
}
return gtype;
}
GType
cogl_buffer_target_get_type (void)
{
static GType gtype = 0;
if (G_UNLIKELY (gtype == 0))
{
static const GFlagsValue values[] = {
{ COGL_WINDOW_BUFFER, "COGL_WINDOW_BUFFER", "window-buffer" },
{ COGL_OFFSCREEN_BUFFER, "COGL_OFFSCREEN_BUFFER", "offscreen-buffer" },
{ 0, NULL, NULL }
};
gtype =
g_flags_register_static (g_intern_static_string ("CoglBufferTarget"),
values);
}
return gtype;
}
GType
cogl_matrix_mode_get_type (void)
{
static GType gtype = 0;
if (G_UNLIKELY (gtype == 0))
{
static const GEnumValue values[] = {
{ COGL_MATRIX_MODELVIEW, "COGL_MATRIX_MODELVIEW", "modelview" },
{ COGL_MATRIX_PROJECTION, "COGL_MATRIX_PROJECTION", "projection" },
{ COGL_MATRIX_TEXTURE, "COGL_MATRIX_TEXTURE", "texture" },
{ 0, NULL, NULL }
};
gtype =
g_enum_register_static (g_intern_static_string ("CoglMatrixMode"),
values);
}
return gtype;
}
GType
cogl_texture_flags_get_type (void)
{
static GType gtype = 0;
if (G_UNLIKELY (gtype == 0))
{
static const GFlagsValue values[] = {
{ COGL_TEXTURE_NONE, "COGL_TEXTURE_NONE", "none" },
{ COGL_TEXTURE_AUTO_MIPMAP, "COGL_TEXTURE_AUTO_MIPMAP", "auto-mipmap" },
{ 0, NULL, NULL }
};
gtype =
g_flags_register_static (g_intern_static_string ("CoglTextureFlags"),
values);
}
return gtype;
}
GType
cogl_fog_mode_get_type (void)
{
static GType gtype = 0;
if (G_UNLIKELY (gtype == 0))
{
static const GEnumValue values[] = {
{ COGL_FOG_MODE_LINEAR, "COGL_FOG_MODE_LINEAR", "linear" },
{ COGL_FOG_MODE_EXPONENTIAL, "COGL_FOG_MODE_EXPONENTIAL", "exponential" },
{ COGL_FOG_MODE_EXPONENTIAL_SQUARED, "COGL_FOG_MODE_EXPONENTIAL_SQUARED", "exponential-squared" },
{ 0, NULL, NULL }
};
gtype =
g_enum_register_static (g_intern_static_string ("CoglFogMode"),
values);
}
return gtype;
}
/*
* CoglFixed
*/
static GTypeInfo _info = {
0,
NULL,
NULL,
NULL,
NULL,
NULL,
0,
0,
NULL,
NULL,
};
static GTypeFundamentalInfo _finfo = { 0, };
static void
cogl_value_init_fixed (GValue *value)
{
value->data[0].v_int = 0;
}
static void
cogl_value_copy_fixed (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = src->data[0].v_int;
}
static gchar *
cogl_value_collect_fixed (GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
value->data[0].v_int = collect_values[0].v_int;
return NULL;
}
static gchar *
cogl_value_lcopy_fixed (const GValue *value,
guint n_collect_values,
GTypeCValue *collect_values,
guint collect_flags)
{
gint32 *fixed_p = collect_values[0].v_pointer;
if (!fixed_p)
return g_strdup_printf ("value location for '%s' passed as NULL",
G_VALUE_TYPE_NAME (value));
*fixed_p = value->data[0].v_int;
return NULL;
}
static void
cogl_value_transform_fixed_int (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = COGL_FIXED_TO_INT (src->data[0].v_int);
}
static void
cogl_value_transform_fixed_double (const GValue *src,
GValue *dest)
{
dest->data[0].v_double = COGL_FIXED_TO_DOUBLE (src->data[0].v_int);
}
static void
cogl_value_transform_fixed_float (const GValue *src,
GValue *dest)
{
dest->data[0].v_float = COGL_FIXED_TO_FLOAT (src->data[0].v_int);
}
static void
cogl_value_transform_int_fixed (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = COGL_FIXED_FROM_INT (src->data[0].v_int);
}
static void
cogl_value_transform_double_fixed (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = COGL_FIXED_FROM_DOUBLE (src->data[0].v_double);
}
static void
cogl_value_transform_float_fixed (const GValue *src,
GValue *dest)
{
dest->data[0].v_int = COGL_FIXED_FROM_FLOAT (src->data[0].v_float);
}
static const GTypeValueTable _cogl_fixed_value_table = {
cogl_value_init_fixed,
NULL,
cogl_value_copy_fixed,
NULL,
"i",
cogl_value_collect_fixed,
"p",
cogl_value_lcopy_fixed
};
GType
cogl_fixed_get_type (void)
{
static GType _cogl_fixed_type = 0;
if (G_UNLIKELY (_cogl_fixed_type == 0))
{
_info.value_table = & _cogl_fixed_value_table;
_cogl_fixed_type =
g_type_register_fundamental (g_type_fundamental_next (),
g_intern_static_string ("CoglFixed"),
&_info, &_finfo, 0);
g_value_register_transform_func (_cogl_fixed_type, G_TYPE_INT,
cogl_value_transform_fixed_int);
g_value_register_transform_func (G_TYPE_INT, _cogl_fixed_type,
cogl_value_transform_int_fixed);
g_value_register_transform_func (_cogl_fixed_type, G_TYPE_FLOAT,
cogl_value_transform_fixed_float);
g_value_register_transform_func (G_TYPE_FLOAT, _cogl_fixed_type,
cogl_value_transform_float_fixed);
g_value_register_transform_func (_cogl_fixed_type, G_TYPE_DOUBLE,
cogl_value_transform_fixed_double);
g_value_register_transform_func (G_TYPE_DOUBLE, _cogl_fixed_type,
cogl_value_transform_double_fixed);
}
return _cogl_fixed_type;
}
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