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/**************************************************************************

 *

 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR

 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 **************************************************************************/

/* Authors:  Keith Whitwell 

 */

#ifndef DRAW_VS_H

#define DRAW_VS_H

#include "draw_context.h"

#include "draw_private.h"

#include "draw_vertex.h"

struct draw_context;

struct pipe_shader_state;

struct draw_variant_input

{

   enum pipe_format format;

   unsigned buffer;

   unsigned offset;

   unsigned instance_divisor;

};

struct draw_variant_output

{

   enum attrib_emit format;     /* output format */

   unsigned vs_output:8;        /* which vertex shader output is this? */

   unsigned offset:24;          /* offset into output vertex */

};

struct draw_variant_element {

   struct draw_variant_input in;

   struct draw_variant_output out;

};

struct draw_vs_variant_key {

   unsigned output_stride;

   unsigned nr_elements:8;      /* max2(nr_inputs, nr_outputs) */

   unsigned nr_inputs:8;

   unsigned nr_outputs:8;

   unsigned viewport:1;

   unsigned clip:1;

   unsigned const_vbuffers:5;

   struct draw_variant_element element[PIPE_MAX_ATTRIBS];

};

struct draw_vs_variant;

struct draw_vs_variant {

   struct draw_vs_variant_key key;

   struct draw_vertex_shader *vs;

   void (*set_buffer)( struct draw_vs_variant *,

                      unsigned i,

                      const void *ptr,

                      unsigned stride,

                      unsigned max_stride );

   void (PIPE_CDECL *run_linear)( struct draw_vs_variant *shader,

                                  unsigned start,

                                  unsigned count,

                                  void *output_buffer );

   void (PIPE_CDECL *run_elts)( struct draw_vs_variant *shader,

                                const unsigned *elts,

                                unsigned count,

                                void *output_buffer );

   void (*destroy)( struct draw_vs_variant * );

};

/**

 * Private version of the compiled vertex_shader

 */

struct draw_vertex_shader {

   struct draw_context *draw;

   /* This member will disappear shortly:

    */

   struct pipe_shader_state   state;

   struct tgsi_shader_info info;

   unsigned position_output;

   unsigned edgeflag_output;

   unsigned clipvertex_output;

   unsigned clipdistance_output[PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT];

   unsigned culldistance_output[PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT];

   /* Extracted from shader:

    */

   const float (*immediates)[4];

   /*

    */

   struct draw_vs_variant *variant[16];

   unsigned nr_variants;

   unsigned last_variant;

   struct draw_vs_variant *(*create_variant)( struct draw_vertex_shader *shader,

                                              const struct draw_vs_variant_key *key );

   void (*prepare)( struct draw_vertex_shader *shader,

		    struct draw_context *draw );

   /* Run the shader - this interface will get cleaned up in the

    * future:

    */

   void (*run_linear)( struct draw_vertex_shader *shader,

		       const float (*input)[4],

		       float (*output)[4],

                       const void *constants[PIPE_MAX_CONSTANT_BUFFERS],

                       const unsigned const_size[PIPE_MAX_CONSTANT_BUFFERS],

		       unsigned count,

		       unsigned input_stride,

		       unsigned output_stride );

   void (*delete)( struct draw_vertex_shader * );

};

struct draw_vs_variant *

draw_vs_lookup_variant( struct draw_vertex_shader *base,

                        const struct draw_vs_variant_key *key );

/********************************************************************************

 * Internal functions:

 */

struct draw_vertex_shader *

draw_create_vs_exec(struct draw_context *draw,

		    const struct pipe_shader_state *templ);

struct draw_vs_variant_key;

struct draw_vertex_shader;

#if HAVE_LLVM

struct draw_vertex_shader *

draw_create_vs_llvm(struct draw_context *draw,

		    const struct pipe_shader_state *state);

#endif

/********************************************************************************

 * Helpers for vs implementations that don't do their own fetch/emit variants.

 * Means these can be shared between shaders.

 */

struct translate;

struct translate_key;

struct translate *draw_vs_get_fetch( struct draw_context *draw,

                                     struct translate_key *key );

struct translate *draw_vs_get_emit( struct draw_context *draw,

                                    struct translate_key *key );

struct draw_vs_variant *

draw_vs_create_variant_generic( struct draw_vertex_shader *vs,

                                const struct draw_vs_variant_key *key );

static INLINE int draw_vs_variant_keysize( const struct draw_vs_variant_key *key )

{

   return 2 * sizeof(int) + key->nr_elements * sizeof(struct draw_variant_element);

}

static INLINE int draw_vs_variant_key_compare( const struct draw_vs_variant_key *a,

                                         const struct draw_vs_variant_key *b )

{

   int keysize = draw_vs_variant_keysize(a);

   return memcmp(a, b, keysize);

}

#define MAX_TGSI_VERTICES 4

#endif