759 lines
22 KiB
C
759 lines
22 KiB
C
/**************************************************************************
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*
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* Copyright 2007-2018 VMware, Inc.
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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 VMWARE 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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* AA line stage: AA lines are converted triangles (with extra generic)
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*
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* Authors: Brian Paul
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*/
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#include "pipe/p_context.h"
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#include "pipe/p_defines.h"
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#include "pipe/p_shader_tokens.h"
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#include "util/u_inlines.h"
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#include "util/format/u_format.h"
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#include "util/u_math.h"
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#include "util/u_memory.h"
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#include "tgsi/tgsi_transform.h"
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#include "tgsi/tgsi_dump.h"
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#include "draw_context.h"
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#include "draw_private.h"
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#include "draw_pipe.h"
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#include "nir.h"
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#include "nir/nir_draw_helpers.h"
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/** Approx number of new tokens for instructions in aa_transform_inst() */
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#define NUM_NEW_TOKENS 53
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/**
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* Subclass of pipe_shader_state to carry extra fragment shader info.
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*/
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struct aaline_fragment_shader
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{
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struct pipe_shader_state state;
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void *driver_fs;
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void *aaline_fs;
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int generic_attrib; /**< generic used for distance */
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};
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/**
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* Subclass of draw_stage
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*/
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struct aaline_stage
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{
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struct draw_stage stage;
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float half_line_width;
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/** For AA lines, this is the vertex attrib slot for new generic */
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uint coord_slot;
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/** position, not necessarily output zero */
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uint pos_slot;
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/*
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* Currently bound state
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*/
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struct aaline_fragment_shader *fs;
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/*
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* Driver interface/override functions
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*/
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void * (*driver_create_fs_state)(struct pipe_context *,
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const struct pipe_shader_state *);
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void (*driver_bind_fs_state)(struct pipe_context *, void *);
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void (*driver_delete_fs_state)(struct pipe_context *, void *);
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};
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/**
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* Subclass of tgsi_transform_context, used for transforming the
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* user's fragment shader to add the special AA instructions.
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*/
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struct aa_transform_context {
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struct tgsi_transform_context base;
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uint64_t tempsUsed; /**< bitmask */
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int colorOutput; /**< which output is the primary color */
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int maxInput, maxGeneric; /**< max input index found */
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int colorTemp, aaTemp; /**< temp registers */
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};
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/**
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* TGSI declaration transform callback.
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* Look for a free input attrib, and two free temp regs.
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*/
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static void
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aa_transform_decl(struct tgsi_transform_context *ctx,
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struct tgsi_full_declaration *decl)
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{
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struct aa_transform_context *aactx = (struct aa_transform_context *)ctx;
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if (decl->Declaration.File == TGSI_FILE_OUTPUT &&
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decl->Semantic.Name == TGSI_SEMANTIC_COLOR &&
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decl->Semantic.Index == 0) {
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aactx->colorOutput = decl->Range.First;
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}
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else if (decl->Declaration.File == TGSI_FILE_INPUT) {
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if ((int) decl->Range.Last > aactx->maxInput)
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aactx->maxInput = decl->Range.Last;
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if (decl->Semantic.Name == TGSI_SEMANTIC_GENERIC &&
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(int) decl->Semantic.Index > aactx->maxGeneric) {
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aactx->maxGeneric = decl->Semantic.Index;
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}
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}
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else if (decl->Declaration.File == TGSI_FILE_TEMPORARY) {
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uint i;
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for (i = decl->Range.First;
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i <= decl->Range.Last; i++) {
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/*
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* XXX this bitfield doesn't really cut it...
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*/
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aactx->tempsUsed |= UINT64_C(1) << i;
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}
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}
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ctx->emit_declaration(ctx, decl);
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}
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/**
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* Find the lowest zero bit, or -1 if bitfield is all ones.
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*/
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static int
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free_bit(uint64_t bitfield)
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{
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return ffsll(~bitfield) - 1;
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}
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/**
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* TGSI transform prolog callback.
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*/
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static void
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aa_transform_prolog(struct tgsi_transform_context *ctx)
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{
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struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
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uint64_t usedTemps = aactx->tempsUsed;
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/* find two free temp regs */
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aactx->colorTemp = free_bit(usedTemps);
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usedTemps |= UINT64_C(1) << aactx->colorTemp;
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aactx->aaTemp = free_bit(usedTemps);
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assert(aactx->colorTemp >= 0);
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assert(aactx->aaTemp >= 0);
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/* declare new generic input/texcoord */
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tgsi_transform_input_decl(ctx, aactx->maxInput + 1,
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TGSI_SEMANTIC_GENERIC, aactx->maxGeneric + 1,
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TGSI_INTERPOLATE_LINEAR);
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/* declare new temp regs */
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tgsi_transform_temp_decl(ctx, aactx->aaTemp);
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tgsi_transform_temp_decl(ctx, aactx->colorTemp);
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}
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/**
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* TGSI transform epilog callback.
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*/
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static void
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aa_transform_epilog(struct tgsi_transform_context *ctx)
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{
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struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
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if (aactx->colorOutput != -1) {
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struct tgsi_full_instruction inst;
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/* insert distance-based coverage code for antialiasing. */
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/* saturate(linewidth - fabs(interpx), linelength - fabs(interpz) */
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inst = tgsi_default_full_instruction();
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inst.Instruction.Saturate = true;
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inst.Instruction.Opcode = TGSI_OPCODE_ADD;
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inst.Instruction.NumDstRegs = 1;
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tgsi_transform_dst_reg(&inst.Dst[0], TGSI_FILE_TEMPORARY,
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aactx->aaTemp, TGSI_WRITEMASK_XZ);
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inst.Instruction.NumSrcRegs = 2;
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tgsi_transform_src_reg(&inst.Src[1], TGSI_FILE_INPUT, aactx->maxInput + 1,
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TGSI_SWIZZLE_X, TGSI_SWIZZLE_X,
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TGSI_SWIZZLE_Z, TGSI_SWIZZLE_Z);
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tgsi_transform_src_reg(&inst.Src[0], TGSI_FILE_INPUT, aactx->maxInput + 1,
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TGSI_SWIZZLE_Y, TGSI_SWIZZLE_Y,
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TGSI_SWIZZLE_W, TGSI_SWIZZLE_W);
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inst.Src[1].Register.Absolute = true;
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inst.Src[1].Register.Negate = true;
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ctx->emit_instruction(ctx, &inst);
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/* MUL width / height alpha */
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tgsi_transform_op2_swz_inst(ctx, TGSI_OPCODE_MUL,
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TGSI_FILE_TEMPORARY, aactx->aaTemp,
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TGSI_WRITEMASK_W,
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TGSI_FILE_TEMPORARY, aactx->aaTemp,
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TGSI_SWIZZLE_X,
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TGSI_FILE_TEMPORARY, aactx->aaTemp,
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TGSI_SWIZZLE_Z, false);
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/* MOV rgb */
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tgsi_transform_op1_inst(ctx, TGSI_OPCODE_MOV,
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TGSI_FILE_OUTPUT, aactx->colorOutput,
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TGSI_WRITEMASK_XYZ,
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TGSI_FILE_TEMPORARY, aactx->colorTemp);
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/* MUL alpha */
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tgsi_transform_op2_inst(ctx, TGSI_OPCODE_MUL,
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TGSI_FILE_OUTPUT, aactx->colorOutput,
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TGSI_WRITEMASK_W,
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TGSI_FILE_TEMPORARY, aactx->colorTemp,
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TGSI_FILE_TEMPORARY, aactx->aaTemp, false);
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}
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}
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/**
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* TGSI instruction transform callback.
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* Replace writes to result.color w/ a temp reg.
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*/
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static void
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aa_transform_inst(struct tgsi_transform_context *ctx,
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struct tgsi_full_instruction *inst)
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{
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struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
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uint i;
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/*
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* Look for writes to result.color and replace with colorTemp reg.
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*/
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for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
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struct tgsi_full_dst_register *dst = &inst->Dst[i];
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if (dst->Register.File == TGSI_FILE_OUTPUT &&
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dst->Register.Index == aactx->colorOutput) {
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dst->Register.File = TGSI_FILE_TEMPORARY;
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dst->Register.Index = aactx->colorTemp;
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}
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}
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ctx->emit_instruction(ctx, inst);
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}
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/**
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* Generate the frag shader we'll use for drawing AA lines.
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* This will be the user's shader plus some arithmetic instructions.
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*/
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static boolean
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generate_aaline_fs(struct aaline_stage *aaline)
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{
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struct pipe_context *pipe = aaline->stage.draw->pipe;
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const struct pipe_shader_state *orig_fs = &aaline->fs->state;
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struct pipe_shader_state aaline_fs;
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struct aa_transform_context transform;
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const uint newLen = tgsi_num_tokens(orig_fs->tokens) + NUM_NEW_TOKENS;
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aaline_fs = *orig_fs; /* copy to init */
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aaline_fs.tokens = tgsi_alloc_tokens(newLen);
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if (aaline_fs.tokens == NULL)
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return FALSE;
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memset(&transform, 0, sizeof(transform));
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transform.colorOutput = -1;
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transform.maxInput = -1;
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transform.maxGeneric = -1;
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transform.colorTemp = -1;
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transform.aaTemp = -1;
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transform.base.prolog = aa_transform_prolog;
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transform.base.epilog = aa_transform_epilog;
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transform.base.transform_instruction = aa_transform_inst;
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transform.base.transform_declaration = aa_transform_decl;
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tgsi_transform_shader(orig_fs->tokens,
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(struct tgsi_token *) aaline_fs.tokens,
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newLen, &transform.base);
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#if 0 /* DEBUG */
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debug_printf("draw_aaline, orig shader:\n");
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tgsi_dump(orig_fs->tokens, 0);
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debug_printf("draw_aaline, new shader:\n");
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tgsi_dump(aaline_fs.tokens, 0);
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#endif
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aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
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if (aaline->fs->aaline_fs != NULL)
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aaline->fs->generic_attrib = transform.maxGeneric + 1;
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FREE((void *)aaline_fs.tokens);
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return aaline->fs->aaline_fs != NULL;
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}
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static boolean
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generate_aaline_fs_nir(struct aaline_stage *aaline)
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{
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#ifdef DRAW_LLVM_AVAILABLE
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struct pipe_context *pipe = aaline->stage.draw->pipe;
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const struct pipe_shader_state *orig_fs = &aaline->fs->state;
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struct pipe_shader_state aaline_fs;
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aaline_fs = *orig_fs; /* copy to init */
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aaline_fs.ir.nir = nir_shader_clone(NULL, orig_fs->ir.nir);
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if (!aaline_fs.ir.nir)
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return FALSE;
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nir_lower_aaline_fs(aaline_fs.ir.nir, &aaline->fs->generic_attrib);
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aaline->fs->aaline_fs = aaline->driver_create_fs_state(pipe, &aaline_fs);
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if (aaline->fs->aaline_fs == NULL)
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return FALSE;
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return TRUE;
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#else
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return FALSE;
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#endif
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}
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/**
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* When we're about to draw our first AA line in a batch, this function is
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* called to tell the driver to bind our modified fragment shader.
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*/
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static boolean
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bind_aaline_fragment_shader(struct aaline_stage *aaline)
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{
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struct draw_context *draw = aaline->stage.draw;
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struct pipe_context *pipe = draw->pipe;
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if (!aaline->fs->aaline_fs) {
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if (aaline->fs->state.type == PIPE_SHADER_IR_NIR) {
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if (!generate_aaline_fs_nir(aaline))
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return FALSE;
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} else
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if (!generate_aaline_fs(aaline))
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return FALSE;
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}
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draw->suspend_flushing = TRUE;
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aaline->driver_bind_fs_state(pipe, aaline->fs->aaline_fs);
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draw->suspend_flushing = FALSE;
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return TRUE;
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}
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static inline struct aaline_stage *
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aaline_stage(struct draw_stage *stage)
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{
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return (struct aaline_stage *) stage;
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}
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/**
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* Draw a wide line by drawing a quad, using geometry which will
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* fullfill GL's antialiased line requirements.
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*/
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static void
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aaline_line(struct draw_stage *stage, struct prim_header *header)
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{
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const struct aaline_stage *aaline = aaline_stage(stage);
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const float half_width = aaline->half_line_width;
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struct prim_header tri;
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struct vertex_header *v[8];
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uint coordPos = aaline->coord_slot;
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uint posPos = aaline->pos_slot;
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float *pos, *tex;
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float dx = header->v[1]->data[posPos][0] - header->v[0]->data[posPos][0];
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float dy = header->v[1]->data[posPos][1] - header->v[0]->data[posPos][1];
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float a = atan2f(dy, dx);
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float c_a = cosf(a), s_a = sinf(a);
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float half_length;
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float t_l, t_w;
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uint i;
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half_length = 0.5f * sqrtf(dx * dx + dy * dy);
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if (half_length < 0.5f) {
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/*
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* The logic we use for "normal" sized segments is incorrect
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* for very short segments (basically because we only have
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* one value to interpolate, not a distance to each endpoint).
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* Therefore, we calculate half_length differently, so that for
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* original line length (near) 0, we get alpha 0 - otherwise
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* max alpha would still be 0.5. This also prevents us from
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* artifacts due to degenerated lines (the endpoints being
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* identical, which would still receive anywhere from alpha
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* 0-0.5 otherwise) (at least the pstipple stage may generate
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* such lines due to float inaccuracies if line length is very
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* close to a integer).
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* Might not be fully accurate neither (because the "strength" of
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* the line is going to be determined by how close to the pixel
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* center those 1 or 2 fragments are) but it's probably the best
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* we can do.
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*/
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half_length = 2.0f * half_length;
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} else {
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half_length = half_length + 0.5f;
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}
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t_w = half_width;
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t_l = 0.5f;
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/* allocate/dup new verts */
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for (i = 0; i < 4; i++) {
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v[i] = dup_vert(stage, header->v[i/2], i);
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}
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/*
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* Quad strip for line from v0 to v1 (*=endpoints):
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*
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* 1 3
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* +-----------------------------+
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* | |
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* | *v0 v1* |
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* | |
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* +-----------------------------+
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* 0 2
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*/
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/*
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* We increase line length by 0.5 pixels (at each endpoint),
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* and calculate the tri endpoints by moving them half-width
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* distance away perpendicular to the line.
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* XXX: since we change line endpoints (by 0.5 pixel), should
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* actually re-interpolate all other values?
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*/
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/* new verts */
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pos = v[0]->data[posPos];
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pos[0] += (-t_l * c_a - t_w * s_a);
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pos[1] += (-t_l * s_a + t_w * c_a);
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pos = v[1]->data[posPos];
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pos[0] += (-t_l * c_a - -t_w * s_a);
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pos[1] += (-t_l * s_a + -t_w * c_a);
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pos = v[2]->data[posPos];
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pos[0] += (t_l * c_a - t_w * s_a);
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pos[1] += (t_l * s_a + t_w * c_a);
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pos = v[3]->data[posPos];
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pos[0] += (t_l * c_a - -t_w * s_a);
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pos[1] += (t_l * s_a + -t_w * c_a);
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/* new texcoords */
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tex = v[0]->data[coordPos];
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ASSIGN_4V(tex, -half_width, half_width, -half_length, half_length);
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tex = v[1]->data[coordPos];
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ASSIGN_4V(tex, half_width, half_width, -half_length, half_length);
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tex = v[2]->data[coordPos];
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ASSIGN_4V(tex, -half_width, half_width, half_length, half_length);
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tex = v[3]->data[coordPos];
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ASSIGN_4V(tex, half_width, half_width, half_length, half_length);
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tri.v[0] = v[2]; tri.v[1] = v[1]; tri.v[2] = v[0];
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stage->next->tri(stage->next, &tri);
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tri.v[0] = v[3]; tri.v[1] = v[1]; tri.v[2] = v[2];
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stage->next->tri(stage->next, &tri);
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}
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static void
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aaline_first_line(struct draw_stage *stage, struct prim_header *header)
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{
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auto struct aaline_stage *aaline = aaline_stage(stage);
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struct draw_context *draw = stage->draw;
|
|
struct pipe_context *pipe = draw->pipe;
|
|
const struct pipe_rasterizer_state *rast = draw->rasterizer;
|
|
void *r;
|
|
|
|
assert(draw->rasterizer->line_smooth && !draw->rasterizer->multisample);
|
|
|
|
if (draw->rasterizer->line_width <= 1.0)
|
|
aaline->half_line_width = 1.0;
|
|
else
|
|
aaline->half_line_width = 0.5f * draw->rasterizer->line_width + 0.5f;
|
|
|
|
if (!draw->rasterizer->half_pixel_center)
|
|
/*
|
|
* The tex coords probably would need adjustments?
|
|
*/
|
|
debug_printf("aa lines without half pixel center may be wrong\n");
|
|
|
|
/*
|
|
* Bind (generate) our fragprog
|
|
*/
|
|
if (!bind_aaline_fragment_shader(aaline)) {
|
|
stage->line = draw_pipe_passthrough_line;
|
|
stage->line(stage, header);
|
|
return;
|
|
}
|
|
|
|
draw_aaline_prepare_outputs(draw, draw->pipeline.aaline);
|
|
|
|
draw->suspend_flushing = TRUE;
|
|
|
|
/* Disable triangle culling, stippling, unfilled mode etc. */
|
|
r = draw_get_rasterizer_no_cull(draw, rast);
|
|
pipe->bind_rasterizer_state(pipe, r);
|
|
|
|
draw->suspend_flushing = FALSE;
|
|
|
|
/* now really draw first line */
|
|
stage->line = aaline_line;
|
|
stage->line(stage, header);
|
|
}
|
|
|
|
|
|
static void
|
|
aaline_flush(struct draw_stage *stage, unsigned flags)
|
|
{
|
|
struct draw_context *draw = stage->draw;
|
|
struct aaline_stage *aaline = aaline_stage(stage);
|
|
struct pipe_context *pipe = draw->pipe;
|
|
|
|
stage->line = aaline_first_line;
|
|
stage->next->flush(stage->next, flags);
|
|
|
|
/* restore original frag shader */
|
|
draw->suspend_flushing = TRUE;
|
|
aaline->driver_bind_fs_state(pipe, aaline->fs ? aaline->fs->driver_fs : NULL);
|
|
|
|
/* restore original rasterizer state */
|
|
if (draw->rast_handle) {
|
|
pipe->bind_rasterizer_state(pipe, draw->rast_handle);
|
|
}
|
|
|
|
draw->suspend_flushing = FALSE;
|
|
|
|
draw_remove_extra_vertex_attribs(draw);
|
|
}
|
|
|
|
|
|
static void
|
|
aaline_reset_stipple_counter(struct draw_stage *stage)
|
|
{
|
|
stage->next->reset_stipple_counter(stage->next);
|
|
}
|
|
|
|
|
|
static void
|
|
aaline_destroy(struct draw_stage *stage)
|
|
{
|
|
struct aaline_stage *aaline = aaline_stage(stage);
|
|
struct pipe_context *pipe = stage->draw->pipe;
|
|
|
|
draw_free_temp_verts(stage);
|
|
|
|
/* restore the old entry points */
|
|
pipe->create_fs_state = aaline->driver_create_fs_state;
|
|
pipe->bind_fs_state = aaline->driver_bind_fs_state;
|
|
pipe->delete_fs_state = aaline->driver_delete_fs_state;
|
|
|
|
FREE(stage);
|
|
}
|
|
|
|
|
|
static struct aaline_stage *
|
|
draw_aaline_stage(struct draw_context *draw)
|
|
{
|
|
struct aaline_stage *aaline = CALLOC_STRUCT(aaline_stage);
|
|
if (!aaline)
|
|
return NULL;
|
|
|
|
aaline->stage.draw = draw;
|
|
aaline->stage.name = "aaline";
|
|
aaline->stage.next = NULL;
|
|
aaline->stage.point = draw_pipe_passthrough_point;
|
|
aaline->stage.line = aaline_first_line;
|
|
aaline->stage.tri = draw_pipe_passthrough_tri;
|
|
aaline->stage.flush = aaline_flush;
|
|
aaline->stage.reset_stipple_counter = aaline_reset_stipple_counter;
|
|
aaline->stage.destroy = aaline_destroy;
|
|
|
|
if (!draw_alloc_temp_verts(&aaline->stage, 8)) {
|
|
aaline->stage.destroy(&aaline->stage);
|
|
return NULL;
|
|
}
|
|
|
|
return aaline;
|
|
}
|
|
|
|
|
|
static struct aaline_stage *
|
|
aaline_stage_from_pipe(struct pipe_context *pipe)
|
|
{
|
|
struct draw_context *draw = (struct draw_context *) pipe->draw;
|
|
|
|
if (draw) {
|
|
return aaline_stage(draw->pipeline.aaline);
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* This function overrides the driver's create_fs_state() function and
|
|
* will typically be called by the gallium frontend.
|
|
*/
|
|
static void *
|
|
aaline_create_fs_state(struct pipe_context *pipe,
|
|
const struct pipe_shader_state *fs)
|
|
{
|
|
struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
|
|
struct aaline_fragment_shader *aafs = NULL;
|
|
|
|
if (!aaline)
|
|
return NULL;
|
|
|
|
aafs = CALLOC_STRUCT(aaline_fragment_shader);
|
|
|
|
if (!aafs)
|
|
return NULL;
|
|
|
|
aafs->state.type = fs->type;
|
|
if (fs->type == PIPE_SHADER_IR_TGSI)
|
|
aafs->state.tokens = tgsi_dup_tokens(fs->tokens);
|
|
#ifdef DRAW_LLVM_AVAILABLE
|
|
else
|
|
aafs->state.ir.nir = nir_shader_clone(NULL, fs->ir.nir);
|
|
#endif
|
|
|
|
/* pass-through */
|
|
aafs->driver_fs = aaline->driver_create_fs_state(pipe, fs);
|
|
|
|
return aafs;
|
|
}
|
|
|
|
|
|
static void
|
|
aaline_bind_fs_state(struct pipe_context *pipe, void *fs)
|
|
{
|
|
struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
|
|
struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
|
|
|
|
if (!aaline) {
|
|
return;
|
|
}
|
|
|
|
/* save current */
|
|
aaline->fs = aafs;
|
|
/* pass-through */
|
|
aaline->driver_bind_fs_state(pipe, (aafs ? aafs->driver_fs : NULL));
|
|
}
|
|
|
|
|
|
static void
|
|
aaline_delete_fs_state(struct pipe_context *pipe, void *fs)
|
|
{
|
|
struct aaline_stage *aaline = aaline_stage_from_pipe(pipe);
|
|
struct aaline_fragment_shader *aafs = (struct aaline_fragment_shader *) fs;
|
|
|
|
if (!aafs) {
|
|
return;
|
|
}
|
|
|
|
if (aaline) {
|
|
/* pass-through */
|
|
aaline->driver_delete_fs_state(pipe, aafs->driver_fs);
|
|
|
|
if (aafs->aaline_fs)
|
|
aaline->driver_delete_fs_state(pipe, aafs->aaline_fs);
|
|
}
|
|
|
|
if (aafs->state.type == PIPE_SHADER_IR_TGSI)
|
|
FREE((void*)aafs->state.tokens);
|
|
else
|
|
ralloc_free(aafs->state.ir.nir);
|
|
FREE(aafs);
|
|
}
|
|
|
|
|
|
void
|
|
draw_aaline_prepare_outputs(struct draw_context *draw,
|
|
struct draw_stage *stage)
|
|
{
|
|
struct aaline_stage *aaline = aaline_stage(stage);
|
|
const struct pipe_rasterizer_state *rast = draw->rasterizer;
|
|
|
|
/* update vertex attrib info */
|
|
aaline->pos_slot = draw_current_shader_position_output(draw);
|
|
|
|
if (!rast->line_smooth || rast->multisample)
|
|
return;
|
|
|
|
/* allocate the extra post-transformed vertex attribute */
|
|
if (aaline->fs && aaline->fs->aaline_fs)
|
|
aaline->coord_slot = draw_alloc_extra_vertex_attrib(draw,
|
|
TGSI_SEMANTIC_GENERIC,
|
|
aaline->fs->generic_attrib);
|
|
else
|
|
aaline->coord_slot = -1;
|
|
}
|
|
|
|
/**
|
|
* Called by drivers that want to install this AA line prim stage
|
|
* into the draw module's pipeline. This will not be used if the
|
|
* hardware has native support for AA lines.
|
|
*/
|
|
boolean
|
|
draw_install_aaline_stage(struct draw_context *draw, struct pipe_context *pipe)
|
|
{
|
|
struct aaline_stage *aaline;
|
|
|
|
pipe->draw = (void *) draw;
|
|
|
|
/*
|
|
* Create / install AA line drawing / prim stage
|
|
*/
|
|
aaline = draw_aaline_stage(draw);
|
|
if (!aaline)
|
|
return FALSE;
|
|
|
|
/* save original driver functions */
|
|
aaline->driver_create_fs_state = pipe->create_fs_state;
|
|
aaline->driver_bind_fs_state = pipe->bind_fs_state;
|
|
aaline->driver_delete_fs_state = pipe->delete_fs_state;
|
|
|
|
/* override the driver's functions */
|
|
pipe->create_fs_state = aaline_create_fs_state;
|
|
pipe->bind_fs_state = aaline_bind_fs_state;
|
|
pipe->delete_fs_state = aaline_delete_fs_state;
|
|
|
|
/* Install once everything is known to be OK:
|
|
*/
|
|
draw->pipeline.aaline = &aaline->stage;
|
|
|
|
return TRUE;
|
|
}
|