378 lines
11 KiB
C
378 lines
11 KiB
C
/**************************************************************************
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*
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* Copyright 2009 VMware, Inc.
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* Copyright 2007-2008 Tungsten Graphics, Inc., Cedar Park, Texas.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
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* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* @file
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* Position and shader input interpolation.
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*
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* @author Jose Fonseca <jfonseca@vmware.com>
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*/
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#include "pipe/p_shader_tokens.h"
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#include "util/u_debug.h"
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#include "util/u_memory.h"
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#include "util/u_math.h"
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#include "tgsi/tgsi_parse.h"
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#include "lp_bld_debug.h"
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#include "lp_bld_const.h"
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#include "lp_bld_arit.h"
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#include "lp_bld_swizzle.h"
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#include "lp_bld_interp.h"
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static void
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attrib_name(LLVMValueRef val, unsigned attrib, unsigned chan, const char *suffix)
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{
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if(attrib == 0)
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lp_build_name(val, "pos.%c%s", "xyzw"[chan], suffix);
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else
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lp_build_name(val, "input%u.%c%s", attrib - 1, "xyzw"[chan], suffix);
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}
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static void
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coeffs_init(struct lp_build_interp_soa_context *bld,
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LLVMValueRef a0_ptr,
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LLVMValueRef dadx_ptr,
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LLVMValueRef dady_ptr)
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{
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LLVMBuilderRef builder = bld->base.builder;
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unsigned attrib;
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unsigned chan;
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for(attrib = 0; attrib < bld->num_attribs; ++attrib) {
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unsigned mask = bld->mask[attrib];
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unsigned mode = bld->mode[attrib];
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for(chan = 0; chan < NUM_CHANNELS; ++chan) {
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if(mask & (1 << chan)) {
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LLVMValueRef index = LLVMConstInt(LLVMInt32Type(), attrib*NUM_CHANNELS + chan, 0);
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LLVMValueRef a0 = NULL;
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LLVMValueRef dadx = NULL;
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LLVMValueRef dady = NULL;
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switch( mode ) {
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case TGSI_INTERPOLATE_PERSPECTIVE:
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/* fall-through */
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case TGSI_INTERPOLATE_LINEAR:
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dadx = LLVMBuildLoad(builder, LLVMBuildGEP(builder, dadx_ptr, &index, 1, ""), "");
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dady = LLVMBuildLoad(builder, LLVMBuildGEP(builder, dady_ptr, &index, 1, ""), "");
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dadx = lp_build_broadcast_scalar(&bld->base, dadx);
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dady = lp_build_broadcast_scalar(&bld->base, dady);
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attrib_name(dadx, attrib, chan, ".dadx");
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attrib_name(dady, attrib, chan, ".dady");
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/* fall-through */
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case TGSI_INTERPOLATE_CONSTANT:
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a0 = LLVMBuildLoad(builder, LLVMBuildGEP(builder, a0_ptr, &index, 1, ""), "");
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a0 = lp_build_broadcast_scalar(&bld->base, a0);
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attrib_name(a0, attrib, chan, ".dady");
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break;
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default:
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assert(0);
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break;
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}
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bld->a0 [attrib][chan] = a0;
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bld->dadx[attrib][chan] = dadx;
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bld->dady[attrib][chan] = dady;
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}
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}
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}
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}
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/**
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* Small vector x scale multiplication optimization.
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*
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* TODO: Should be elsewhere.
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*/
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static LLVMValueRef
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coeff_multiply(struct lp_build_interp_soa_context *bld,
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LLVMValueRef coeff,
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int step)
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{
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LLVMValueRef factor;
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switch(step) {
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case 0:
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return bld->base.zero;
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case 1:
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return coeff;
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case 2:
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return lp_build_add(&bld->base, coeff, coeff);
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default:
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factor = lp_build_const_scalar(bld->base.type, (double)step);
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return lp_build_mul(&bld->base, coeff, factor);
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}
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}
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/**
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* Multiply the dadx and dady with the xstep and ystep respectively.
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*/
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static void
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coeffs_update(struct lp_build_interp_soa_context *bld)
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{
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unsigned attrib;
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unsigned chan;
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for(attrib = 0; attrib < bld->num_attribs; ++attrib) {
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unsigned mask = bld->mask[attrib];
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unsigned mode = bld->mode[attrib];
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if (mode != TGSI_INTERPOLATE_CONSTANT) {
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for(chan = 0; chan < NUM_CHANNELS; ++chan) {
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if(mask & (1 << chan)) {
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bld->dadx[attrib][chan] = coeff_multiply(bld, bld->dadx[attrib][chan], bld->xstep);
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bld->dady[attrib][chan] = coeff_multiply(bld, bld->dady[attrib][chan], bld->ystep);
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}
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}
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}
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}
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}
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static void
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attribs_init(struct lp_build_interp_soa_context *bld)
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{
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LLVMValueRef x = bld->pos[0];
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LLVMValueRef y = bld->pos[1];
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LLVMValueRef oow = NULL;
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unsigned attrib;
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unsigned chan;
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for(attrib = 0; attrib < bld->num_attribs; ++attrib) {
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unsigned mask = bld->mask[attrib];
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unsigned mode = bld->mode[attrib];
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for(chan = 0; chan < NUM_CHANNELS; ++chan) {
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if(mask & (1 << chan)) {
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LLVMValueRef a0 = bld->a0 [attrib][chan];
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LLVMValueRef dadx = bld->dadx[attrib][chan];
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LLVMValueRef dady = bld->dady[attrib][chan];
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LLVMValueRef res;
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res = a0;
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if (mode != TGSI_INTERPOLATE_CONSTANT) {
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res = lp_build_add(&bld->base, res, lp_build_mul(&bld->base, x, dadx));
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res = lp_build_add(&bld->base, res, lp_build_mul(&bld->base, y, dady));
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}
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/* Keep the value of the attribue before perspective divide for faster updates */
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bld->attribs_pre[attrib][chan] = res;
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if (mode == TGSI_INTERPOLATE_PERSPECTIVE) {
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LLVMValueRef w = bld->pos[3];
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assert(attrib != 0);
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if(!oow)
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oow = lp_build_rcp(&bld->base, w);
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res = lp_build_mul(&bld->base, res, oow);
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}
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attrib_name(res, attrib, chan, "");
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bld->attribs[attrib][chan] = res;
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}
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}
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}
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}
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static void
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attribs_update(struct lp_build_interp_soa_context *bld)
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{
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LLVMValueRef oow = NULL;
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unsigned attrib;
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unsigned chan;
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for(attrib = 0; attrib < bld->num_attribs; ++attrib) {
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unsigned mask = bld->mask[attrib];
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unsigned mode = bld->mode[attrib];
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if (mode != TGSI_INTERPOLATE_CONSTANT) {
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for(chan = 0; chan < NUM_CHANNELS; ++chan) {
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if(mask & (1 << chan)) {
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LLVMValueRef dadx = bld->dadx[attrib][chan];
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LLVMValueRef dady = bld->dady[attrib][chan];
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LLVMValueRef res;
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res = bld->attribs_pre[attrib][chan];
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if(bld->xstep)
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res = lp_build_add(&bld->base, res, dadx);
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if(bld->ystep)
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res = lp_build_add(&bld->base, res, dady);
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bld->attribs_pre[attrib][chan] = res;
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if (mode == TGSI_INTERPOLATE_PERSPECTIVE) {
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LLVMValueRef w = bld->pos[3];
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assert(attrib != 0);
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if(!oow)
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oow = lp_build_rcp(&bld->base, w);
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res = lp_build_mul(&bld->base, res, oow);
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}
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attrib_name(res, attrib, chan, "");
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bld->attribs[attrib][chan] = res;
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}
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}
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}
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}
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}
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/**
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* Generate the position vectors.
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*
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* Parameter x0, y0 are the integer values with the quad upper left coordinates.
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*/
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static void
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pos_init(struct lp_build_interp_soa_context *bld,
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LLVMValueRef x0,
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LLVMValueRef y0)
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{
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lp_build_name(x0, "pos.x");
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lp_build_name(y0, "pos.y");
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bld->attribs[0][0] = x0;
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bld->attribs[0][1] = y0;
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}
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static void
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pos_update(struct lp_build_interp_soa_context *bld)
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{
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LLVMValueRef x = bld->attribs[0][0];
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LLVMValueRef y = bld->attribs[0][1];
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if(bld->xstep)
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x = lp_build_add(&bld->base, x, lp_build_const_scalar(bld->base.type, bld->xstep));
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if(bld->ystep)
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y = lp_build_add(&bld->base, y, lp_build_const_scalar(bld->base.type, bld->ystep));
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lp_build_name(x, "pos.x");
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lp_build_name(y, "pos.y");
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bld->attribs[0][0] = x;
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bld->attribs[0][1] = y;
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}
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void
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lp_build_interp_soa_init(struct lp_build_interp_soa_context *bld,
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const struct tgsi_token *tokens,
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LLVMBuilderRef builder,
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union lp_type type,
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LLVMValueRef a0_ptr,
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LLVMValueRef dadx_ptr,
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LLVMValueRef dady_ptr,
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LLVMValueRef x0,
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LLVMValueRef y0,
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int xstep,
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int ystep)
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{
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struct tgsi_parse_context parse;
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struct tgsi_full_declaration *decl;
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memset(bld, 0, sizeof *bld);
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lp_build_context_init(&bld->base, builder, type);
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/* For convenience */
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bld->pos = bld->attribs[0];
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bld->inputs = (const LLVMValueRef (*)[NUM_CHANNELS]) bld->attribs[1];
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/* Position */
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bld->num_attribs = 1;
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bld->mask[0] = TGSI_WRITEMASK_ZW;
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bld->mode[0] = TGSI_INTERPOLATE_LINEAR;
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/* Inputs */
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tgsi_parse_init( &parse, tokens );
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while( !tgsi_parse_end_of_tokens( &parse ) ) {
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tgsi_parse_token( &parse );
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switch( parse.FullToken.Token.Type ) {
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case TGSI_TOKEN_TYPE_DECLARATION:
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decl = &parse.FullToken.FullDeclaration;
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if( decl->Declaration.File == TGSI_FILE_INPUT ) {
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unsigned first, last, mask;
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unsigned attrib;
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first = decl->DeclarationRange.First;
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last = decl->DeclarationRange.Last;
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mask = decl->Declaration.UsageMask;
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for( attrib = first; attrib <= last; ++attrib ) {
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bld->mask[1 + attrib] = mask;
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bld->mode[1 + attrib] = decl->Declaration.Interpolate;
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}
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bld->num_attribs = MAX2(bld->num_attribs, 1 + last + 1);
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}
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break;
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case TGSI_TOKEN_TYPE_INSTRUCTION:
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case TGSI_TOKEN_TYPE_IMMEDIATE:
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break;
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default:
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assert( 0 );
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}
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}
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tgsi_parse_free( &parse );
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coeffs_init(bld, a0_ptr, dadx_ptr, dady_ptr);
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pos_init(bld, x0, y0);
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attribs_init(bld);
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bld->xstep = xstep;
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bld->ystep = ystep;
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coeffs_update(bld);
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}
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/**
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* Advance the position and inputs with the xstep and ystep.
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*/
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void
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lp_build_interp_soa_update(struct lp_build_interp_soa_context *bld)
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{
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pos_update(bld);
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attribs_update(bld);
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}
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