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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
* Position and shader input interpolation.
*
* Special attention is given to the interpolation of side by side quads.
* Multiplications are made only for the first quad. Interpolation of
* inputs for posterior quads are done exclusively with additions, and
* perspective divide if necessary.
*
* @author Jose Fonseca <jfonseca@vmware.com>
*/
#ifndef LP_BLD_INTERP_H
#define LP_BLD_INTERP_H
#include "gallivm/lp_bld.h"
#include "gallivm/lp_bld_type.h"
#include "tgsi/tgsi_exec.h"
/**
* Describes how to compute the interpolation coefficients (a0, dadx, dady)
* from the vertices passed into our triangle/line/point functions by the
* draw module.
*
* Vertices are treated as an array of float[4] values, indexed by
* src_index.
*
* LP_INTERP_COLOR is translated to either LP_INTERP_CONSTANT or
* LINEAR depending on flatshade state.
*/
enum lp_interp {
LP_INTERP_CONSTANT,
LP_INTERP_COLOR,
LP_INTERP_LINEAR,
LP_INTERP_PERSPECTIVE,
LP_INTERP_POSITION,
LP_INTERP_FACING
};
struct lp_shader_input {
ushort interp:4; /* enum lp_interp */
ushort usage_mask:4; /* bitmask of TGSI_WRITEMASK_x flags */
ushort src_index:8; /* where to find values in incoming vertices */
};
struct lp_build_interp_soa_context
{
/* QUAD_SIZE x float */
struct lp_build_context coeff_bld;
unsigned num_attribs;
unsigned mask[1 + PIPE_MAX_SHADER_INPUTS]; /**< TGSI_WRITE_MASK_x */
enum lp_interp interp[1 + PIPE_MAX_SHADER_INPUTS];
LLVMValueRef x;
LLVMValueRef y;
LLVMValueRef a [1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
LLVMValueRef dadq[1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
LLVMValueRef oow;
LLVMValueRef attribs[1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
/*
* Convenience pointers. Callers may access this one.
*/
const LLVMValueRef *pos;
const LLVMValueRef (*inputs)[NUM_CHANNELS];
};
void
lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld,
unsigned num_inputs,
const struct lp_shader_input *inputs,
LLVMBuilderRef builder,
struct lp_type type,
LLVMValueRef a0_ptr,
LLVMValueRef dadx_ptr,
LLVMValueRef dady_ptr,
LLVMValueRef x,
LLVMValueRef y);
void
lp_build_interp_soa_update(struct lp_build_interp_soa_context *bld,
int quad_index);
#endif /* LP_BLD_INTERP_H */
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