/************************************************************************** * * 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 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * **************************************************************************/ /** * Texture sampling code generation * * This file is nothing more than ugly glue between three largely independent * entities: * - TGSI -> LLVM translation (i.e., lp_build_tgsi_soa) * - texture sampling code generation (i.e., lp_build_sample_soa) * - LLVM pipe driver * * All interesting code is in the functions mentioned above. There is really * nothing to see here. * * @author Jose Fonseca */ #include "pipe/p_defines.h" #include "pipe/p_shader_tokens.h" #include "gallivm/lp_bld_debug.h" #include "gallivm/lp_bld_const.h" #include "gallivm/lp_bld_type.h" #include "gallivm/lp_bld_sample.h" #include "gallivm/lp_bld_tgsi.h" #include "lp_jit.h" #include "lp_tex_sample.h" #include "lp_debug.h" /** * This provides the bridge between the sampler state store in * lp_jit_context and lp_jit_texture and the sampler code * generator. It provides the texture layout information required by * the texture sampler code generator in terms of the state stored in * lp_jit_context and lp_jit_texture in runtime. */ struct llvmpipe_sampler_dynamic_state { struct lp_sampler_dynamic_state base; const struct lp_sampler_static_state *static_state; LLVMValueRef context_ptr; }; /** * This is the bridge between our sampler and the TGSI translator. */ struct lp_llvm_sampler_soa { struct lp_build_sampler_soa base; struct llvmpipe_sampler_dynamic_state dynamic_state; }; /** * Fetch the specified member of the lp_jit_texture structure. * \param emit_load if TRUE, emit the LLVM load instruction to actually * fetch the field's value. Otherwise, just emit the * GEP code to address the field. * * @sa http://llvm.org/docs/GetElementPtr.html */ static LLVMValueRef lp_llvm_texture_member(const struct lp_sampler_dynamic_state *base, struct gallivm_state *gallivm, unsigned unit, unsigned member_index, const char *member_name, boolean emit_load) { struct llvmpipe_sampler_dynamic_state *state = (struct llvmpipe_sampler_dynamic_state *)base; LLVMBuilderRef builder = gallivm->builder; LLVMValueRef indices[4]; LLVMValueRef ptr; LLVMValueRef res; assert(unit < PIPE_MAX_SAMPLERS); /* context[0] */ indices[0] = lp_build_const_int32(gallivm, 0); /* context[0].textures */ indices[1] = lp_build_const_int32(gallivm, LP_JIT_CTX_TEXTURES); /* context[0].textures[unit] */ indices[2] = lp_build_const_int32(gallivm, unit); /* context[0].textures[unit].member */ indices[3] = lp_build_const_int32(gallivm, member_index); ptr = LLVMBuildGEP(builder, state->context_ptr, indices, Elements(indices), ""); if (emit_load) res = LLVMBuildLoad(builder, ptr, ""); else res = ptr; lp_build_name(res, "context.texture%u.%s", unit, member_name); return res; } /** * Helper macro to instantiate the functions that generate the code to * fetch the members of lp_jit_texture to fulfill the sampler code * generator requests. * * This complexity is the price we have to pay to keep the texture * sampler code generator a reusable module without dependencies to * llvmpipe internals. */ #define LP_LLVM_TEXTURE_MEMBER(_name, _index, _emit_load) \ static LLVMValueRef \ lp_llvm_texture_##_name( const struct lp_sampler_dynamic_state *base, \ struct gallivm_state *gallivm, \ unsigned unit) \ { \ return lp_llvm_texture_member(base, gallivm, unit, _index, #_name, _emit_load ); \ } LP_LLVM_TEXTURE_MEMBER(width, LP_JIT_TEXTURE_WIDTH, TRUE) LP_LLVM_TEXTURE_MEMBER(height, LP_JIT_TEXTURE_HEIGHT, TRUE) LP_LLVM_TEXTURE_MEMBER(depth, LP_JIT_TEXTURE_DEPTH, TRUE) LP_LLVM_TEXTURE_MEMBER(first_level, LP_JIT_TEXTURE_FIRST_LEVEL, TRUE) LP_LLVM_TEXTURE_MEMBER(last_level, LP_JIT_TEXTURE_LAST_LEVEL, TRUE) LP_LLVM_TEXTURE_MEMBER(row_stride, LP_JIT_TEXTURE_ROW_STRIDE, FALSE) LP_LLVM_TEXTURE_MEMBER(img_stride, LP_JIT_TEXTURE_IMG_STRIDE, FALSE) LP_LLVM_TEXTURE_MEMBER(data_ptr, LP_JIT_TEXTURE_DATA, FALSE) LP_LLVM_TEXTURE_MEMBER(min_lod, LP_JIT_TEXTURE_MIN_LOD, TRUE) LP_LLVM_TEXTURE_MEMBER(max_lod, LP_JIT_TEXTURE_MAX_LOD, TRUE) LP_LLVM_TEXTURE_MEMBER(lod_bias, LP_JIT_TEXTURE_LOD_BIAS, TRUE) LP_LLVM_TEXTURE_MEMBER(border_color, LP_JIT_TEXTURE_BORDER_COLOR, FALSE) static void lp_llvm_sampler_soa_destroy(struct lp_build_sampler_soa *sampler) { FREE(sampler); } /** * Fetch filtered values from texture. * The 'texel' parameter returns four vectors corresponding to R, G, B, A. */ static void lp_llvm_sampler_soa_emit_fetch_texel(const struct lp_build_sampler_soa *base, struct gallivm_state *gallivm, struct lp_type type, unsigned unit, unsigned num_coords, const LLVMValueRef *coords, const LLVMValueRef *ddx, const LLVMValueRef *ddy, LLVMValueRef lod_bias, /* optional */ LLVMValueRef explicit_lod, /* optional */ LLVMValueRef *texel) { struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base; assert(unit < PIPE_MAX_SAMPLERS); if (LP_PERF & PERF_NO_TEX) { lp_build_sample_nop(gallivm, type, texel); return; } lp_build_sample_soa(gallivm, &sampler->dynamic_state.static_state[unit], &sampler->dynamic_state.base, type, unit, num_coords, coords, ddx, ddy, lod_bias, explicit_lod, texel); } struct lp_build_sampler_soa * lp_llvm_sampler_soa_create(const struct lp_sampler_static_state *static_state, LLVMValueRef context_ptr) { struct lp_llvm_sampler_soa *sampler; sampler = CALLOC_STRUCT(lp_llvm_sampler_soa); if(!sampler) return NULL; sampler->base.destroy = lp_llvm_sampler_soa_destroy; sampler->base.emit_fetch_texel = lp_llvm_sampler_soa_emit_fetch_texel; sampler->dynamic_state.base.width = lp_llvm_texture_width; sampler->dynamic_state.base.height = lp_llvm_texture_height; sampler->dynamic_state.base.depth = lp_llvm_texture_depth; sampler->dynamic_state.base.first_level = lp_llvm_texture_first_level; sampler->dynamic_state.base.last_level = lp_llvm_texture_last_level; sampler->dynamic_state.base.row_stride = lp_llvm_texture_row_stride; sampler->dynamic_state.base.img_stride = lp_llvm_texture_img_stride; sampler->dynamic_state.base.data_ptr = lp_llvm_texture_data_ptr; sampler->dynamic_state.base.min_lod = lp_llvm_texture_min_lod; sampler->dynamic_state.base.max_lod = lp_llvm_texture_max_lod; sampler->dynamic_state.base.lod_bias = lp_llvm_texture_lod_bias; sampler->dynamic_state.base.border_color = lp_llvm_texture_border_color; sampler->dynamic_state.static_state = static_state; sampler->dynamic_state.context_ptr = context_ptr; return &sampler->base; }