src/amd/common/ac_shader_abi.h

   1 /*
   2  * Copyright 2017 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #ifndef AC_SHADER_ABI_H
  25 #define AC_SHADER_ABI_H
  26
  27 #include <llvm-c/Core.h>
  28
  29 enum ac_descriptor_type {
  30         AC_DESC_IMAGE,
  31         AC_DESC_FMASK,
  32         AC_DESC_SAMPLER,
  33         AC_DESC_BUFFER,
  34 };
  35
  36 /* Document the shader ABI during compilation. This is what allows radeonsi and
  37  * radv to share a compiler backend.
  38  */
  39 struct ac_shader_abi {
  40         LLVMValueRef base_vertex;
  41         LLVMValueRef start_instance;
  42         LLVMValueRef draw_id;
  43         LLVMValueRef vertex_id;
  44         LLVMValueRef instance_id;
  45         LLVMValueRef frag_pos[4];
  46         LLVMValueRef front_face;
  47         LLVMValueRef ancillary;
  48         LLVMValueRef sample_coverage;
  49
  50         /* For VS and PS: pre-loaded shader inputs.
  51          *
  52          * Currently only used for NIR shaders; indexed by variables'
  53          * driver_location.
  54          */
  55         LLVMValueRef *inputs;
  56
  57         void (*emit_outputs)(struct ac_shader_abi *abi,
  58                              unsigned max_outputs,
  59                              LLVMValueRef *addrs);
  60
  61         void (*emit_vertex)(struct ac_shader_abi *abi,
  62                             unsigned stream,
  63                             LLVMValueRef *addrs);
  64
  65         LLVMValueRef (*load_ubo)(struct ac_shader_abi *abi, LLVMValueRef index);
  66
  67         /**
  68          * Load the descriptor for the given buffer.
  69          *
  70          * \param buffer the buffer as presented in NIR: this is the descriptor
  71          *               in Vulkan, and the buffer index in OpenGL/Gallium
  72          * \param write whether buffer contents will be written
  73          */
  74         LLVMValueRef (*load_ssbo)(struct ac_shader_abi *abi,
  75                                   LLVMValueRef buffer, bool write);
  76
  77         /**
  78          * Load a descriptor associated to a sampler.
  79          *
  80          * \param descriptor_set the descriptor set index (only for Vulkan)
  81          * \param base_index the base index of the sampler variable
  82          * \param constant_index constant part of an array index (or 0, if the
  83          *                       sampler variable is not an array)
  84          * \param index non-constant part of an array index (may be NULL)
  85          * \param desc_type the type of descriptor to load
  86          * \param image whether the descriptor is loaded for an image operation
  87          */
  88         LLVMValueRef (*load_sampler_desc)(struct ac_shader_abi *abi,
  89                                           unsigned descriptor_set,
  90                                           unsigned base_index,
  91                                           unsigned constant_index,
  92                                           LLVMValueRef index,
  93                                           enum ac_descriptor_type desc_type,
  94                                           bool image, bool write);
  95
  96         /* Whether to clamp the shadow reference value to [0,1]on VI. Radeonsi currently
  97          * uses it due to promoting D16 to D32, but radv needs it off. */
  98         bool clamp_shadow_reference;
  99 };
 100
 101 #endif /* AC_SHADER_ABI_H */