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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2009 VMware, Inc.
  4.  * All Rights Reserved.
  5.  *
  6.  * Permission is hereby granted, free of charge, to any person obtaining a
  7.  * copy of this software and associated documentation files (the
  8.  * "Software"), to deal in the Software without restriction, including
  9.  * without limitation the rights to use, copy, modify, merge, publish,
  10.  * distribute, sub license, and/or sell copies of the Software, and to
  11.  * permit persons to whom the Software is furnished to do so, subject to
  12.  * the following conditions:
  13.  *
  14.  * The above copyright notice and this permission notice (including the
  15.  * next paragraph) shall be included in all copies or substantial portions
  16.  * of the Software.
  17.  *
  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19.  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20.  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21.  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22.  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23.  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24.  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25.  *
  26.  **************************************************************************/
  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. /**
  50.  * Describes how to compute the interpolation coefficients (a0, dadx, dady)
  51.  * from the vertices passed into our triangle/line/point functions by the
  52.  * draw module.
  53.  *
  54.  * Vertices are treated as an array of float[4] values, indexed by
  55.  * src_index.
  56.  *
  57.  * LP_INTERP_COLOR is translated to either LP_INTERP_CONSTANT or
  58.  * PERSPECTIVE depending on flatshade state.
  59.  */
  60. enum lp_interp {
  61.    LP_INTERP_CONSTANT,
  62.    LP_INTERP_COLOR,
  63.    LP_INTERP_LINEAR,
  64.    LP_INTERP_PERSPECTIVE,
  65.    LP_INTERP_POSITION,
  66.    LP_INTERP_FACING
  67. };
  68.  
  69. struct lp_shader_input {
  70.    uint interp:4;       /* enum lp_interp */
  71.    uint usage_mask:4;   /* bitmask of TGSI_WRITEMASK_x flags */
  72.    uint src_index:8;    /* where to find values in incoming vertices */
  73.    uint cyl_wrap:4;     /* TGSI_CYLINDRICAL_WRAP_x flags */
  74.    uint padding:12;
  75. };
  76.  
  77.  
  78. struct lp_build_interp_soa_context
  79. {
  80.    /* TGSI_QUAD_SIZE x float */
  81.    struct lp_build_context coeff_bld;
  82.    struct lp_build_context setup_bld;
  83.  
  84.    unsigned num_attribs;
  85.    unsigned mask[1 + PIPE_MAX_SHADER_INPUTS]; /**< TGSI_WRITE_MASK_x */
  86.    enum lp_interp interp[1 + PIPE_MAX_SHADER_INPUTS];
  87.    boolean simple_interp;
  88.  
  89.    double pos_offset;
  90.  
  91.    LLVMValueRef x;
  92.    LLVMValueRef y;
  93.  
  94.    LLVMValueRef a[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS];
  95.    LLVMValueRef dadq[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS];
  96.    LLVMValueRef a0aos[1 + PIPE_MAX_SHADER_INPUTS];
  97.    LLVMValueRef dadxaos[1 + PIPE_MAX_SHADER_INPUTS];
  98.    LLVMValueRef dadyaos[1 + PIPE_MAX_SHADER_INPUTS];
  99.  
  100.    LLVMValueRef attribs[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS];
  101.  
  102.    LLVMValueRef xoffset_store;
  103.    LLVMValueRef yoffset_store;
  104.  
  105.    /*
  106.     * Convenience pointers. Callers may access this one.
  107.     */
  108.    const LLVMValueRef *pos;
  109.    const LLVMValueRef (*inputs)[TGSI_NUM_CHANNELS];
  110. };
  111.  
  112.  
  113. void
  114. lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld,
  115.                          struct gallivm_state *gallivm,
  116.                          unsigned num_inputs,
  117.                          const struct lp_shader_input *inputs,
  118.                          boolean pixel_center_integer,
  119.                          LLVMBuilderRef builder,
  120.                          struct lp_type type,
  121.                          LLVMValueRef a0_ptr,
  122.                          LLVMValueRef dadx_ptr,
  123.                          LLVMValueRef dady_ptr,
  124.                          LLVMValueRef x,
  125.                          LLVMValueRef y);
  126.  
  127. void
  128. lp_build_interp_soa_update_inputs_dyn(struct lp_build_interp_soa_context *bld,
  129.                                       struct gallivm_state *gallivm,
  130.                                       LLVMValueRef quad_start_index);
  131.  
  132. void
  133. lp_build_interp_soa_update_pos_dyn(struct lp_build_interp_soa_context *bld,
  134.                                    struct gallivm_state *gallivm,
  135.                                    LLVMValueRef quad_start_index);
  136.  
  137. #endif /* LP_BLD_INTERP_H */
  138.