src/gallium/drivers/llvmpipe/lp_bld_interp.h

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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 "gallivm/lp_bld.h"
  45 #include "gallivm/lp_bld_type.h"
  46
  47 #include "tgsi/tgsi_exec.h"
  48
  49 #include "lp_setup.h"
  50
  51
  52 struct lp_build_interp_soa_context
  53 {
  54    /* QUAD_SIZE x float */
  55    struct lp_build_context coeff_bld;
  56
  57    unsigned num_attribs;
  58    unsigned mask[1 + PIPE_MAX_SHADER_INPUTS]; /**< TGSI_WRITE_MASK_x */
  59    enum lp_interp interp[1 + PIPE_MAX_SHADER_INPUTS];
  60
  61    LLVMValueRef x;
  62    LLVMValueRef y;
  63
  64    LLVMValueRef a   [1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
  65    LLVMValueRef dadq[1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
  66
  67    LLVMValueRef attribs[1 + PIPE_MAX_SHADER_INPUTS][NUM_CHANNELS];
  68
  69    /*
  70     * Convenience pointers. Callers may access this one.
  71     */
  72    const LLVMValueRef *pos;
  73    const LLVMValueRef (*inputs)[NUM_CHANNELS];
  74 };
  75
  76
  77 void
  78 lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld,
  79                          unsigned num_inputs,
  80                          const struct lp_shader_input *inputs,
  81                          LLVMBuilderRef builder,
  82                          struct lp_type type,
  83                          LLVMValueRef a0_ptr,
  84                          LLVMValueRef dadx_ptr,
  85                          LLVMValueRef dady_ptr,
  86                          LLVMValueRef x,
  87                          LLVMValueRef y);
  88
  89 void
  90 lp_build_interp_soa_update(struct lp_build_interp_soa_context *bld,
  91                            int quad_index);
  92
  93
  94 #endif /* LP_BLD_INTERP_H */