src/gallium/drivers/llvmpipe/lp_bld_interp.h

   1 /**************************************************************************
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   3  * Copyright 2009 VMware, Inc.
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  16  * of the Software.
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  27
  28 /**
  29  * @file
  30  * Position and shader input interpolation.
  31  *
  32  * Special attention is given to the interpolation of side by side quads.
  33  * Multiplications are made only for the first quad. Interpolation of
  34  * inputs for posterior quads are done exclusively with additions, and
  35  * perspective divide if necessary.
  36  *
  37  * @author Jose Fonseca <jfonseca@vmware.com>
  38  */
  39
  40 #ifndef LP_BLD_INTERP_H
  41 #define LP_BLD_INTERP_H
  42
  43
  44 #include <llvm-c/Core.h>
  45
  46 #include "tgsi/tgsi_exec.h"
  47
  48 #include "lp_bld_type.h"
  49
  50
  51 struct tgsi_token;
  52
  53
  54 struct lp_build_interp_soa_context
  55 {
  56    struct lp_build_context base;
  57
  58    unsigned num_attribs;
  59    unsigned mask[1 + PIPE_MAX_SHADER_INPUTS];
  60    unsigned mode[1 + PIPE_MAX_SHADER_INPUTS];
  61
  62    LLVMValueRef a0  [1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
  63    LLVMValueRef dadx[1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
  64    LLVMValueRef dady[1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
  65
  66    int xstep;
  67    int ystep;
  68
  69    /* Attribute values before perspective divide */
  70    LLVMValueRef attribs_pre[1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
  71
  72    LLVMValueRef attribs[1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
  73
  74    /*
  75     * Convenience pointers. Callers may access this one.
  76     */
  77    const LLVMValueRef *pos;
  78    const LLVMValueRef (*inputs)[NUM_CHANNELS];
  79 };
  80
  81
  82 void
  83 lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld,
  84                          const struct tgsi_token *tokens,
  85                          LLVMBuilderRef builder,
  86                          struct lp_type type,
  87                          LLVMValueRef a0_ptr,
  88                          LLVMValueRef dadx_ptr,
  89                          LLVMValueRef dady_ptr,
  90                          LLVMValueRef x0,
  91                          LLVMValueRef y0,
  92                          int xstep,
  93                          int ystep);
  94
  95 void
  96 lp_build_interp_soa_update(struct lp_build_interp_soa_context *bld);
  97
  98
  99 #endif /* LP_BLD_INTERP_H */