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/**************************************************************************
*
* 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 <jfonseca@vmware.com>
*/
#include "pipe/p_defines.h"
#include "pipe/p_shader_tokens.h"
#include "gallivm/lp_bld_debug.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"
/**
* 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(struct lp_sampler_dynamic_state *base,
LLVMBuilderRef builder,
unsigned unit,
unsigned member_index,
const char *member_name,
boolean emit_load)
{
struct llvmpipe_sampler_dynamic_state *state =
(struct llvmpipe_sampler_dynamic_state *)base;
LLVMValueRef indices[4];
LLVMValueRef ptr;
LLVMValueRef res;
assert(unit < PIPE_MAX_SAMPLERS);
/* context[0] */
indices[0] = LLVMConstInt(LLVMInt32Type(), 0, 0);
/* context[0].textures */
indices[1] = LLVMConstInt(LLVMInt32Type(), LP_JIT_CONTEXT_TEXTURES_INDEX, 0);
/* context[0].textures[unit] */
indices[2] = LLVMConstInt(LLVMInt32Type(), unit, 0);
/* context[0].textures[unit].member */
indices[3] = LLVMConstInt(LLVMInt32Type(), member_index, 0);
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( struct lp_sampler_dynamic_state *base, \
LLVMBuilderRef builder, \
unsigned unit) \
{ \
return lp_llvm_texture_member(base, builder, 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(last_level, LP_JIT_TEXTURE_LAST_LEVEL, TRUE)
LP_LLVM_TEXTURE_MEMBER(stride, LP_JIT_TEXTURE_STRIDE, TRUE)
LP_LLVM_TEXTURE_MEMBER(data_ptr, LP_JIT_TEXTURE_DATA, 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(struct lp_build_sampler_soa *base,
LLVMBuilderRef builder,
struct lp_type type,
unsigned unit,
unsigned num_coords,
const LLVMValueRef *coords,
LLVMValueRef lodbias,
LLVMValueRef *texel)
{
struct lp_llvm_sampler_soa *sampler = (struct lp_llvm_sampler_soa *)base;
assert(unit < PIPE_MAX_SAMPLERS);
lp_build_sample_soa(builder,
&sampler->dynamic_state.static_state[unit],
&sampler->dynamic_state.base,
type,
unit,
num_coords,
coords,
lodbias,
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.last_level = lp_llvm_texture_last_level;
sampler->dynamic_state.base.stride = lp_llvm_texture_stride;
sampler->dynamic_state.base.data_ptr = lp_llvm_texture_data_ptr;
sampler->dynamic_state.static_state = static_state;
sampler->dynamic_state.context_ptr = context_ptr;
return &sampler->base;
}
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