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 boolean dynamic_offsets; 89 90 LLVMValueRef x; 91 LLVMValueRef y; 92 93 LLVMValueRef a[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS]; 94 LLVMValueRef dadq[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS]; 95 LLVMValueRef a0aos[1 + PIPE_MAX_SHADER_INPUTS]; 96 LLVMValueRef dadxaos[1 + PIPE_MAX_SHADER_INPUTS]; 97 LLVMValueRef dadyaos[1 + PIPE_MAX_SHADER_INPUTS]; 98 99 LLVMValueRef oow; 100 101 LLVMValueRef attribs[1 + PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS]; 102 103 LLVMValueRef xoffset_store; 104 LLVMValueRef yoffset_store; 105 106 /* 107 * Convenience pointers. Callers may access this one. 108 */ 109 const LLVMValueRef *pos; 110 const LLVMValueRef (*inputs)[TGSI_NUM_CHANNELS]; 111 }; 112 113 114 void 115 lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld, 116 struct gallivm_state *gallivm, 117 unsigned num_inputs, 118 const struct lp_shader_input *inputs, 119 LLVMBuilderRef builder, 120 struct lp_type type, 121 boolean dynamic_offsets, 122 LLVMValueRef a0_ptr, 123 LLVMValueRef dadx_ptr, 124 LLVMValueRef dady_ptr, 125 LLVMValueRef x, 126 LLVMValueRef y); 127 128 void 129 lp_build_interp_soa_update_inputs(struct lp_build_interp_soa_context *bld, 130 struct gallivm_state *gallivm, 131 int quad_start_index); 132 133 void 134 lp_build_interp_soa_update_pos(struct lp_build_interp_soa_context *bld, 135 struct gallivm_state *gallivm, 136 int quad__start_index); 137 138 void 139 lp_build_interp_soa_update_inputs_dyn(struct lp_build_interp_soa_context *bld, 140 struct gallivm_state *gallivm, 141 LLVMValueRef quad_start_index); 142 143 void 144 lp_build_interp_soa_update_pos_dyn(struct lp_build_interp_soa_context *bld, 145 struct gallivm_state *gallivm, 146 LLVMValueRef quad_start_index); 147 148 #endif /* LP_BLD_INTERP_H */ 149