/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* @file
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* Position and shader input interpolation.
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*
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* Special attention is given to the interpolation of side by side quads.
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* Multiplications are made only for the first quad. Interpolation of
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* inputs for posterior quads are done exclusively with additions, and
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* perspective divide if necessary.
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*
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* @author Jose Fonseca <jfonseca@vmware.com>
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*/
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#ifndef LP_BLD_INTERP_H
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#define LP_BLD_INTERP_H
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#include "gallivm/lp_bld.h"
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#include "gallivm/lp_bld_type.h"
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#include "tgsi/tgsi_exec.h"
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/**
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* Describes how to compute the interpolation coefficients (a0, dadx, dady)
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* from the vertices passed into our triangle/line/point functions by the
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* draw module.
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*
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* Vertices are treated as an array of float[4] values, indexed by
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* src_index.
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*
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* LP_INTERP_COLOR is translated to either LP_INTERP_CONSTANT or
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* PERSPECTIVE depending on flatshade state.
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*/
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enum lp_interp {
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LP_INTERP_CONSTANT,
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LP_INTERP_COLOR,
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LP_INTERP_LINEAR,
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LP_INTERP_PERSPECTIVE,
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LP_INTERP_POSITION,
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LP_INTERP_FACING
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};
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struct lp_shader_input {
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uint interp:4; /* enum lp_interp */
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uint usage_mask:4; /* bitmask of TGSI_WRITEMASK_x flags */
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uint src_index:8; /* where to find values in incoming vertices */
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uint cyl_wrap:4; /* TGSI_CYLINDRICAL_WRAP_x flags */
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uint padding:12;
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};
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struct lp_build_interp_soa_context
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{
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/* TGSI_QUAD_SIZE x float */
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struct lp_build_context coeff_bld;
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struct lp_build_context setup_bld;
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unsigned num_attribs;
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unsigned mask[1 + PIPE_MAX_SHADER_INPUTS]; /**< TGSI_WRITE_MASK_x */
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enum lp_interp interp[1 + PIPE_MAX_SHADER_INPUTS];
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boolean simple_interp;
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boolean depth_clamp;
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double pos_offset;
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LLVMValueRef x;
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LLVMValueRef y;
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LLVMValueRef a[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS];
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LLVMValueRef dadq[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS];
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LLVMValueRef a0aos[1 + PIPE_MAX_SHADER_INPUTS];
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LLVMValueRef dadxaos[1 + PIPE_MAX_SHADER_INPUTS];
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LLVMValueRef dadyaos[1 + PIPE_MAX_SHADER_INPUTS];
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LLVMValueRef attribs[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS];
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LLVMValueRef xoffset_store;
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LLVMValueRef yoffset_store;
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/*
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* Convenience pointers. Callers may access this one.
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*/
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const LLVMValueRef *pos;
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const LLVMValueRef (*inputs)[TGSI_NUM_CHANNELS];
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};
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void
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lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld,
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struct gallivm_state *gallivm,
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unsigned num_inputs,
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const struct lp_shader_input *inputs,
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boolean pixel_center_integer,
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boolean depth_clamp,
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LLVMBuilderRef builder,
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struct lp_type type,
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LLVMValueRef a0_ptr,
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LLVMValueRef dadx_ptr,
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LLVMValueRef dady_ptr,
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LLVMValueRef x,
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LLVMValueRef y);
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void
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lp_build_interp_soa_update_inputs_dyn(struct lp_build_interp_soa_context *bld,
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struct gallivm_state *gallivm,
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LLVMValueRef quad_start_index);
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void
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lp_build_interp_soa_update_pos_dyn(struct lp_build_interp_soa_context *bld,
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struct gallivm_state *gallivm,
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LLVMValueRef quad_start_index);
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#endif /* LP_BLD_INTERP_H */
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