1/**************************************************************************
2 *
3 * Copyright (C) 2015 Advanced Micro Devices, Inc.
4 * Copyright 2007 VMware, Inc.
5 * All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the
9 * "Software"), to deal in the Software without restriction, including
10 * without limitation the rights to use, copy, modify, merge, publish,
11 * distribute, sub license, and/or sell copies of the Software, and to
12 * permit persons to whom the Software is furnished to do so, subject to
13 * the following conditions:
14 *
15 * The above copyright notice and this permission notice (including the
16 * next paragraph) shall be included in all copies or substantial portions
17 * of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
22 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
23 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
24 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
25 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 *
27 **************************************************************************/
28
29#include "st_cb_bitmap.h"
30#include "tgsi/tgsi_transform.h"
31#include "tgsi/tgsi_scan.h"
32#include "tgsi/tgsi_dump.h"
33#include "util/u_debug.h"
34
35struct tgsi_bitmap_transform {
36   struct tgsi_transform_context base;
37   struct tgsi_shader_info info;
38   unsigned sampler_index;
39   unsigned tex_target;
40   bool use_texcoord;
41   bool swizzle_xxxx;
42   bool first_instruction_emitted;
43};
44
45static inline struct tgsi_bitmap_transform *
46tgsi_bitmap_transform(struct tgsi_transform_context *tctx)
47{
48   return (struct tgsi_bitmap_transform *)tctx;
49}
50
51static void
52transform_instr(struct tgsi_transform_context *tctx,
53		struct tgsi_full_instruction *current_inst)
54{
55   struct tgsi_bitmap_transform *ctx = tgsi_bitmap_transform(tctx);
56   struct tgsi_full_instruction inst;
57   unsigned tgsi_tex_target = ctx->tex_target == PIPE_TEXTURE_2D
58      ? TGSI_TEXTURE_2D : TGSI_TEXTURE_RECT;
59   unsigned i, semantic;
60   int texcoord_index = -1;
61
62   if (ctx->first_instruction_emitted) {
63      tctx->emit_instruction(tctx, current_inst);
64      return;
65   }
66
67   ctx->first_instruction_emitted = true;
68
69   /* Add TEMP[0] if it's missing. */
70   if (ctx->info.file_max[TGSI_FILE_TEMPORARY] == -1) {
71      tgsi_transform_temp_decl(tctx, 0);
72   }
73
74   /* Add TEXCOORD[0] if it's missing. */
75   semantic = ctx->use_texcoord ? TGSI_SEMANTIC_TEXCOORD :
76                                  TGSI_SEMANTIC_GENERIC;
77   for (i = 0; i < ctx->info.num_inputs; i++) {
78      if (ctx->info.input_semantic_name[i] == semantic &&
79          ctx->info.input_semantic_index[i] == 0) {
80         texcoord_index = i;
81         break;
82      }
83   }
84
85   if (texcoord_index == -1) {
86      texcoord_index = ctx->info.num_inputs;
87      tgsi_transform_input_decl(tctx, texcoord_index,
88                                semantic, 0, TGSI_INTERPOLATE_PERSPECTIVE);
89   }
90
91   /* Declare the sampler. */
92   tgsi_transform_sampler_decl(tctx, ctx->sampler_index);
93
94   /* Declare the sampler view. */
95   tgsi_transform_sampler_view_decl(tctx, ctx->sampler_index,
96                                    tgsi_tex_target, TGSI_RETURN_TYPE_FLOAT);
97
98   /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
99   tgsi_transform_tex_inst(tctx,
100                           TGSI_FILE_TEMPORARY, 0,
101                           TGSI_FILE_INPUT, texcoord_index,
102                           tgsi_tex_target, ctx->sampler_index);
103
104   /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
105   inst = tgsi_default_full_instruction();
106   inst.Instruction.Opcode = TGSI_OPCODE_KILL_IF;
107   inst.Instruction.NumDstRegs = 0;
108   inst.Instruction.NumSrcRegs = 1;
109
110   inst.Src[0].Register.File  = TGSI_FILE_TEMPORARY;
111   inst.Src[0].Register.Index = 0;
112   inst.Src[0].Register.Negate = 1;
113   inst.Src[0].Register.SwizzleX = TGSI_SWIZZLE_X;
114   if (ctx->swizzle_xxxx) {
115      inst.Src[0].Register.SwizzleY = TGSI_SWIZZLE_X;
116      inst.Src[0].Register.SwizzleZ = TGSI_SWIZZLE_X;
117      inst.Src[0].Register.SwizzleW = TGSI_SWIZZLE_X;
118   } else {
119      inst.Src[0].Register.SwizzleY = TGSI_SWIZZLE_Y;
120      inst.Src[0].Register.SwizzleZ = TGSI_SWIZZLE_Z;
121      inst.Src[0].Register.SwizzleW = TGSI_SWIZZLE_W;
122   }
123   tctx->emit_instruction(tctx, &inst);
124
125   /* And emit the instruction we got. */
126   tctx->emit_instruction(tctx, current_inst);
127}
128
129const struct tgsi_token *
130st_get_bitmap_shader(const struct tgsi_token *tokens,
131                     unsigned tex_target, unsigned sampler_index,
132                     bool use_texcoord, bool swizzle_xxxx)
133{
134   struct tgsi_bitmap_transform ctx;
135   struct tgsi_token *newtoks;
136   int newlen;
137
138   assert(tex_target == PIPE_TEXTURE_2D ||
139          tex_target == PIPE_TEXTURE_RECT);
140
141   memset(&ctx, 0, sizeof(ctx));
142   ctx.base.transform_instruction = transform_instr;
143   ctx.tex_target = tex_target;
144   ctx.sampler_index = sampler_index;
145   ctx.use_texcoord = use_texcoord;
146   ctx.swizzle_xxxx = swizzle_xxxx;
147   tgsi_scan_shader(tokens, &ctx.info);
148
149   newlen = tgsi_num_tokens(tokens) + 20;
150   newtoks = tgsi_alloc_tokens(newlen);
151   if (!newtoks)
152      return NULL;
153
154   tgsi_transform_shader(tokens, newtoks, newlen, &ctx.base);
155   return newtoks;
156}
157