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mutter/cogl/cogl-pipeline-snippet.c
Neil Roberts 68b3643b25 snippet: Add a hook for the layer texture coordinate transformation 
This adds a hook called COGL_SNIPPET_HOOK_TEXTURE_COORD_TRANSFORM.
This can be used to alter the application of the layer user matrix to
a texture coordinate or it can bypass it altogether.

This is the first per-layer hook that affects the vertex shader state
so the patch includes the boilerplate needed to get that to work.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
2011-12-06 19:02:06 +00:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2011 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, see
* <http://www.gnu.org/licenses/>.
*
*
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "cogl-pipeline-snippet-private.h"
#include "cogl-snippet-private.h"
#include "cogl-util.h"
/* Helper functions that are used by both GLSL pipeline backends */
void
_cogl_pipeline_snippet_generate_code (const CoglPipelineSnippetData *data)
{
CoglPipelineSnippet *first_snippet, *snippet;
int snippet_num = 0;
int n_snippets = 0;
first_snippet = COGL_LIST_FIRST (data->snippets);
/* First count the number of snippets so we can easily tell when
we're at the last one */
COGL_LIST_FOREACH (snippet, data->snippets, list_node)
if (snippet->snippet->hook == data->hook)
{
/* Don't bother processing any previous snippets if we reach
one that has a replacement */
if (snippet->snippet->replace)
{
n_snippets = 1;
first_snippet = snippet;
}
else
n_snippets++;
}
/* If there weren't any snippets then generate a stub function with
the final name */
if (n_snippets == 0)
{
if (data->return_type)
g_string_append_printf (data->source_buf,
"\n"
"%s\n"
"%s (%s)\n"
"{\n"
" return %s (%s);\n"
"}\n",
data->return_type,
data->final_name,
data->argument_declarations ?
data->argument_declarations : "",
data->chain_function,
data->arguments ? data->arguments : "");
else
g_string_append_printf (data->source_buf,
"\n"
"void\n"
"%s (%s)\n"
"{\n"
" %s (%s);\n"
"}\n",
data->final_name,
data->argument_declarations ?
data->argument_declarations : "",
data->chain_function,
data->arguments ? data->arguments : "");
return;
}
for (snippet = first_snippet, snippet_num = 0;
snippet_num < n_snippets;
snippet = COGL_LIST_NEXT (snippet, list_node), snippet_num++)
if (snippet->snippet->hook == data->hook)
{
const char *source;
if ((source = cogl_snippet_get_declarations (snippet->snippet)))
g_string_append (data->source_buf, source);
g_string_append_printf (data->source_buf,
"\n"
"%s\n",
data->return_type ?
data->return_type :
"void");
if (snippet_num + 1 < n_snippets)
g_string_append_printf (data->source_buf,
"%s_%i",
data->function_prefix,
snippet_num);
else
g_string_append (data->source_buf, data->final_name);
g_string_append (data->source_buf, " (");
if (data->argument_declarations)
g_string_append (data->source_buf, data->argument_declarations);
g_string_append (data->source_buf,
")\n"
"{\n");
if (data->return_type && !data->return_variable_is_argument)
g_string_append_printf (data->source_buf,
" %s %s;\n"
"\n",
data->return_type,
data->return_variable);
if ((source = cogl_snippet_get_pre (snippet->snippet)))
g_string_append (data->source_buf, source);
/* Chain on to the next function, or bypass it if there is
a replace string */
if ((source = cogl_snippet_get_replace (snippet->snippet)))
g_string_append (data->source_buf, source);
else
{
g_string_append (data->source_buf, " ");
if (data->return_type)
g_string_append_printf (data->source_buf,
"%s = ",
data->return_variable);
if (snippet_num > 0)
g_string_append_printf (data->source_buf,
"%s_%i",
data->function_prefix,
snippet_num - 1);
else
g_string_append (data->source_buf, data->chain_function);
g_string_append (data->source_buf, " (");
if (data->arguments)
g_string_append (data->source_buf, data->arguments);
g_string_append (data->source_buf, ");\n");
}
if ((source = cogl_snippet_get_post (snippet->snippet)))
g_string_append (data->source_buf, source);
if (data->return_type)
g_string_append_printf (data->source_buf,
" return %s;\n",
data->return_variable);
g_string_append (data->source_buf, "}\n");
}
}
static void
_cogl_pipeline_snippet_free (CoglPipelineSnippet *pipeline_snippet)
{
cogl_object_unref (pipeline_snippet->snippet);
g_slice_free (CoglPipelineSnippet, pipeline_snippet);
}
void
_cogl_pipeline_snippet_list_free (CoglPipelineSnippetList *list)
{
CoglPipelineSnippet *pipeline_snippet, *tmp;
COGL_LIST_FOREACH_SAFE (pipeline_snippet, list, list_node, tmp)
_cogl_pipeline_snippet_free (pipeline_snippet);
}
void
_cogl_pipeline_snippet_list_add (CoglPipelineSnippetList *list,
CoglSnippet *snippet)
{
CoglPipelineSnippet *pipeline_snippet = g_slice_new (CoglPipelineSnippet);
pipeline_snippet->snippet = cogl_object_ref (snippet);
_cogl_snippet_make_immutable (pipeline_snippet->snippet);
if (COGL_LIST_EMPTY (list))
COGL_LIST_INSERT_HEAD (list, pipeline_snippet, list_node);
else
{
CoglPipelineSnippet *tail;
for (tail = COGL_LIST_FIRST (list);
COGL_LIST_NEXT (tail, list_node);
tail = COGL_LIST_NEXT (tail, list_node));
COGL_LIST_INSERT_AFTER (tail, pipeline_snippet, list_node);
}
}
void
_cogl_pipeline_snippet_list_copy (CoglPipelineSnippetList *dst,
const CoglPipelineSnippetList *src)
{
CoglPipelineSnippet *tail = NULL;
const CoglPipelineSnippet *l;
COGL_LIST_INIT (dst);
COGL_LIST_FOREACH (l, src, list_node)
{
CoglPipelineSnippet *copy = g_slice_dup (CoglPipelineSnippet, l);
cogl_object_ref (copy->snippet);
if (tail)
COGL_LIST_INSERT_AFTER (tail, copy, list_node);
else
COGL_LIST_INSERT_HEAD (dst, copy, list_node);
tail = copy;
}
}
void
_cogl_pipeline_snippet_list_hash (CoglPipelineSnippetList *list,
unsigned int *hash)
{
CoglPipelineSnippet *l;
COGL_LIST_FOREACH (l, list, list_node)
{
*hash = _cogl_util_one_at_a_time_hash (*hash,
&l->snippet,
sizeof (CoglSnippet *));
}
}
gboolean
_cogl_pipeline_snippet_list_equal (CoglPipelineSnippetList *list0,
CoglPipelineSnippetList *list1)
{
CoglPipelineSnippet *l0, *l1;
for (l0 = COGL_LIST_FIRST (list0), l1 = COGL_LIST_FIRST (list1);
l0 && l1;
l0 = COGL_LIST_NEXT (l0, list_node), l1 = COGL_LIST_NEXT (l1, list_node))
if (l0->snippet != l1->snippet)
return FALSE;
return l0 == NULL && l1 == NULL;
}
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