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/**************************************************************************
*
* Copyright 2009 VMware, Inc.
* 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 VMWARE 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.
*
**************************************************************************/
/**
* @file
* Texture sampling.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#ifndef LP_BLD_SAMPLE_H
#define LP_BLD_SAMPLE_H
#include <llvm-c/Core.h>
struct pipe_texture;
struct pipe_sampler_state;
struct util_format_description;
struct lp_type;
struct lp_build_context;
/**
* Sampler static state.
*
* These are the bits of state from pipe_texture and pipe_sampler_state that
* are embedded in the generated code.
*/
struct lp_sampler_static_state
{
/* pipe_texture's state */
enum pipe_format format;
unsigned target:2;
unsigned pot_width:1;
unsigned pot_height:1;
unsigned pot_depth:1;
/* pipe_sampler_state's state */
unsigned wrap_s:3;
unsigned wrap_t:3;
unsigned wrap_r:3;
unsigned min_img_filter:2;
unsigned min_mip_filter:2;
unsigned mag_img_filter:2;
unsigned compare_mode:1;
unsigned compare_func:3;
unsigned normalized_coords:1;
float lod_bias, min_lod, max_lod;
float border_color[4];
};
/**
* Sampler dynamic state.
*
* These are the bits of state from pipe_texture and pipe_sampler_state that
* are computed in runtime.
*
* There are obtained through callbacks, as we don't want to tie the texture
* sampling code generation logic to any particular texture layout or pipe
* driver.
*/
struct lp_sampler_dynamic_state
{
/** Obtain the base texture width. */
LLVMValueRef
(*width)( struct lp_sampler_dynamic_state *state,
LLVMBuilderRef builder,
unsigned unit);
/** Obtain the base texture height. */
LLVMValueRef
(*height)( struct lp_sampler_dynamic_state *state,
LLVMBuilderRef builder,
unsigned unit);
/** Obtain the base texture depth. */
LLVMValueRef
(*depth)( struct lp_sampler_dynamic_state *state,
LLVMBuilderRef builder,
unsigned unit);
/** Obtain the number of mipmap levels (minus one). */
LLVMValueRef
(*last_level)( struct lp_sampler_dynamic_state *state,
LLVMBuilderRef builder,
unsigned unit);
LLVMValueRef
(*stride)( struct lp_sampler_dynamic_state *state,
LLVMBuilderRef builder,
unsigned unit);
LLVMValueRef
(*data_ptr)( struct lp_sampler_dynamic_state *state,
LLVMBuilderRef builder,
unsigned unit);
};
/**
* Derive the sampler static state.
*/
void
lp_sampler_static_state(struct lp_sampler_static_state *state,
const struct pipe_texture *texture,
const struct pipe_sampler_state *sampler);
LLVMValueRef
lp_build_gather(LLVMBuilderRef builder,
unsigned length,
unsigned src_width,
unsigned dst_width,
LLVMValueRef base_ptr,
LLVMValueRef offsets);
LLVMValueRef
lp_build_sample_offset(struct lp_build_context *bld,
const struct util_format_description *format_desc,
LLVMValueRef x,
LLVMValueRef y,
LLVMValueRef y_stride);
void
lp_build_sample_soa(LLVMBuilderRef builder,
const struct lp_sampler_static_state *static_state,
struct lp_sampler_dynamic_state *dynamic_state,
struct lp_type fp_type,
unsigned unit,
unsigned num_coords,
const LLVMValueRef *coords,
LLVMValueRef lodbias,
LLVMValueRef *texel);
#endif /* LP_BLD_SAMPLE_H */
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