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/*
* Authored By Niels De Graef <niels.degraef@barco.com>
*
* Copyright (C) 2018 Barco NV
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "cogl-config.h"
#include "cogl-object-private.h"
#include "cogl-gtype-private.h"
#include "cogl-pixel-format-conversion.h"
#include "cogl-snippet.h"
#include "cogl-pipeline-layer-state.h"
#include "cogl-pipeline-state.h"
#define _COGL_YUV_TO_RGBA(res, y, u, v) \
res ".r = " y " + 1.59765625 * " v ";\n" \
res ".g = " y " - 0.390625 * " u " - 0.8125 * " v ";\n" \
res ".b = " y " + 2.015625 * " u ";\n" \
res ".a = 1.0;\n"
static const gchar nv12_to_rgba_shader[] =
"vec4\n"
"cogl_nv12_to_rgba (vec2 UV)\n"
"{\n"
" vec4 color;\n"
" float y = 1.1640625 * (texture2D (cogl_sampler0, UV).x - 0.0625);\n"
" vec2 uv = texture2D (cogl_sampler1, UV).rg;\n"
" uv -= 0.5;\n"
" float u = uv.x;\n"
" float v = uv.y;\n"
_COGL_YUV_TO_RGBA ("color", "y", "u", "v")
" return color;\n"
"}\n";
static const gchar yuv_to_rgba_shader[] =
"vec4\n"
"cogl_yuv_to_rgba (vec2 UV)\n"
"{\n"
" vec4 color;\n"
" float y = 1.16438356 * (texture2D(cogl_sampler0, UV).x - 0.0625);\n"
" float u = texture2D(cogl_sampler1, UV).x - 0.5;\n"
" float v = texture2D(cogl_sampler2, UV).x - 0.5;\n"
_COGL_YUV_TO_RGBA ("color", "y", "u", "v")
" return color;\n"
"}\n";
struct _CoglPixelFormatConversion
{
CoglObject _parent;
CoglSnippet *vertex_declaration_snippet;
CoglSnippet *fragment_declaration_snippet;
CoglSnippet *fragment_execution_snippet;
};
static void
_cogl_pixel_format_conversion_free (CoglPixelFormatConversion *self);
COGL_OBJECT_DEFINE (PixelFormatConversion, pixel_format_conversion);
COGL_GTYPE_DEFINE_CLASS (PixelFormatConversion, pixel_format_conversion);
void
cogl_pixel_format_conversion_attach_to_pipeline (CoglPixelFormatConversion *self,
CoglPipeline *pipeline,
gint layer)
{
cogl_pipeline_add_snippet (pipeline, self->fragment_declaration_snippet);
cogl_pipeline_add_snippet (pipeline, self->vertex_declaration_snippet);
cogl_pipeline_add_layer_snippet (pipeline,
layer,
self->fragment_execution_snippet);
}
static gboolean
get_cogl_snippets (CoglPixelFormat format,
CoglSnippet **vertex_snippet_out,
CoglSnippet **fragment_snippet_out,
CoglSnippet **layer_snippet_out)
{
const gchar *global_hook;
const gchar *layer_hook;
switch (format)
{
case COGL_PIXEL_FORMAT_YUV444:
global_hook = yuv_to_rgba_shader;
layer_hook = "cogl_layer = cogl_yuv_to_rgba(cogl_tex_coord0_in.st);\n";
break;
case COGL_PIXEL_FORMAT_NV12:
/* XXX are we using Y_UV or Y_xUxV? Maybe check for RG support? */
global_hook = nv12_to_rgba_shader;
layer_hook = "cogl_layer = cogl_nv12_to_rgba(cogl_tex_coord0_in.st);\n";
break;
default:
*vertex_snippet_out = NULL;
*fragment_snippet_out = NULL;
*layer_snippet_out = NULL;
return FALSE;
}
*vertex_snippet_out = cogl_snippet_new (COGL_SNIPPET_HOOK_VERTEX_GLOBALS,
global_hook,
NULL);
*fragment_snippet_out = cogl_snippet_new (COGL_SNIPPET_HOOK_FRAGMENT_GLOBALS,
global_hook,
NULL);
*layer_snippet_out = cogl_snippet_new (COGL_SNIPPET_HOOK_LAYER_FRAGMENT,
NULL,
layer_hook);
return TRUE;
}
static void
_cogl_pixel_format_conversion_free (CoglPixelFormatConversion *self)
{
cogl_clear_object (&self->vertex_declaration_snippet);
cogl_clear_object (&self->fragment_declaration_snippet);
cogl_clear_object (&self->fragment_execution_snippet);
}
CoglPixelFormatConversion *
cogl_pixel_format_conversion_new (CoglPixelFormat format)
{
CoglPixelFormatConversion *self;
CoglSnippet *vertex_declaration_snippet;
CoglSnippet *fragment_declaration_snippet;
CoglSnippet *fragment_execution_snippet;
if (!get_cogl_snippets (format,
&vertex_declaration_snippet,
&fragment_declaration_snippet,
&fragment_execution_snippet))
return NULL;
self = g_slice_new0 (CoglPixelFormatConversion);
_cogl_pixel_format_conversion_object_new (self);
self->vertex_declaration_snippet = vertex_declaration_snippet;
self->fragment_declaration_snippet = fragment_declaration_snippet;
self->fragment_execution_snippet = fragment_execution_snippet;
return self;
}
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