df0f9a862f
This adds a per-layer snippet hook for the texure lookup. Here the snippet can modify the texture coordinates used for the lookup or modify the texel resulting from the lookup. This is the first per-layer hook so this also adds the COGL_PIPELINE_LAYER_STATE_FRAGMENT_SNIPPETS state and all of the boilerplate needed to make that work. Most of the functions used by the pipeline state to manage the snippet list has been moved into cogl-pipeline-snippet.c so that it can be shared with the layer state. Reviewed-by: Robert Bragg <robert@linux.intel.com>
117 lines
3.3 KiB
C
117 lines
3.3 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2011 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*
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* Authors:
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* Neil Roberts <neil@linux.intel.com>
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*/
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#ifndef __COGL_PIPELINE_SNIPPET_PRIVATE_H
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#define __COGL_PIPELINE_SNIPPET_PRIVATE_H
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#include "cogl-snippet.h"
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#include "cogl-queue.h"
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/* Enumeration of all the hook points that a snippet can be attached
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to within a pipeline. */
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typedef enum
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{
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COGL_PIPELINE_SNIPPET_HOOK_VERTEX,
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COGL_PIPELINE_SNIPPET_HOOK_FRAGMENT,
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COGL_PIPELINE_SNIPPET_HOOK_TEXTURE_LOOKUP
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} CoglPipelineSnippetHook;
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typedef struct _CoglPipelineSnippet CoglPipelineSnippet;
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COGL_LIST_HEAD (CoglPipelineSnippetList, CoglPipelineSnippet);
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struct _CoglPipelineSnippet
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{
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COGL_LIST_ENTRY (CoglPipelineSnippet) list_node;
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/* Hook where this snippet is attached */
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CoglPipelineSnippetHook hook;
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CoglSnippet *snippet;
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};
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/* Arguments to pass to _cogl_pipeline_snippet_generate_code() */
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typedef struct
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{
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CoglPipelineSnippetList *snippets;
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/* Only snippets at this hook point will be used */
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CoglPipelineSnippetHook hook;
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/* The final function to chain on to after all of the snippets code
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has been run */
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const char *chain_function;
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/* The name of the final generated function */
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const char *final_name;
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/* A prefix to insert before each generate function name */
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const char *function_prefix;
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/* The return type of all of the functions, or NULL to use void */
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const char *return_type;
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/* A variable to return from the functions. The snippets are
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expected to modify this variable. Ignored if return_type is
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NULL */
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const char *return_variable;
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/* The argument names or NULL if there are none */
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const char *arguments;
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/* The argument types or NULL */
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const char *argument_declarations;
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/* The string to generate the source into */
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GString *source_buf;
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} CoglPipelineSnippetData;
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void
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_cogl_pipeline_snippet_generate_code (const CoglPipelineSnippetData *data);
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void
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_cogl_pipeline_snippet_list_free (CoglPipelineSnippetList *list);
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void
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_cogl_pipeline_snippet_list_add (CoglPipelineSnippetList *list,
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CoglPipelineSnippetHook hook,
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CoglSnippet *snippet);
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void
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_cogl_pipeline_snippet_list_copy (CoglPipelineSnippetList *dst,
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const CoglPipelineSnippetList *src);
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void
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_cogl_pipeline_snippet_list_hash (CoglPipelineSnippetList *list,
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unsigned int *hash);
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gboolean
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_cogl_pipeline_snippet_list_equal (CoglPipelineSnippetList *list0,
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CoglPipelineSnippetList *list1);
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#endif /* __COGL_PIPELINE_SNIPPET_PRIVATE_H */
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