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