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 "util/u_debug.h"
33
34struct tgsi_bitmap_transform {
35   struct tgsi_transform_context base;
36   struct tgsi_shader_info info;
37   unsigned sampler_index;
38   unsigned tex_target;
39   bool use_texcoord;
40   bool swizzle_xxxx;
41   bool first_instruction_emitted;
42};
43
44static inline struct tgsi_bitmap_transform *
45tgsi_bitmap_transform(struct tgsi_transform_context *tctx)
46{
47   return (struct tgsi_bitmap_transform *)tctx;
48}
49
50static void
51transform_instr(struct tgsi_transform_context *tctx,
52		struct tgsi_full_instruction *current_inst)
53{
54   struct tgsi_bitmap_transform *ctx = tgsi_bitmap_transform(tctx);
55   struct tgsi_full_instruction inst;
56   unsigned tgsi_tex_target = ctx->tex_target == PIPE_TEXTURE_2D
57      ? TGSI_TEXTURE_2D : TGSI_TEXTURE_RECT;
58   unsigned i, semantic;
59   int texcoord_index = -1;
60
61   if (ctx->first_instruction_emitted) {
62      tctx->emit_instruction(tctx, current_inst);
63      return;
64   }
65
66   ctx->first_instruction_emitted = true;
67
68   /* Add TEMP[0] if it's missing. */
69   if (ctx->info.file_max[TGSI_FILE_TEMPORARY] == -1) {
70      tgsi_transform_temp_decl(tctx, 0);
71   }
72
73   /* Add TEXCOORD[0] if it's missing. */
74   semantic = ctx->use_texcoord ? TGSI_SEMANTIC_TEXCOORD :
75                                  TGSI_SEMANTIC_GENERIC;
76   for (i = 0; i < ctx->info.num_inputs; i++) {
77      if (ctx->info.input_semantic_name[i] == semantic &&
78          ctx->info.input_semantic_index[i] == 0) {
79         texcoord_index = i;
80         break;
81      }
82   }
83
84   if (texcoord_index == -1) {
85      texcoord_index = ctx->info.num_inputs;
86      tgsi_transform_input_decl(tctx, texcoord_index,
87                                semantic, 0, TGSI_INTERPOLATE_PERSPECTIVE);
88   }
89
90   /* Declare the sampler. */
91   tgsi_transform_sampler_decl(tctx, ctx->sampler_index);
92
93   /* Declare the sampler view. */
94   tgsi_transform_sampler_view_decl(tctx, ctx->sampler_index,
95                                    tgsi_tex_target, TGSI_RETURN_TYPE_FLOAT);
96
97   /* TEX tmp0, fragment.texcoord[0], texture[0], 2D; */
98   tgsi_transform_tex_inst(tctx,
99                           TGSI_FILE_TEMPORARY, 0,
100                           TGSI_FILE_INPUT, texcoord_index,
101                           tgsi_tex_target, ctx->sampler_index);
102
103   /* KIL if -tmp0 < 0 # texel=0 -> keep / texel=0 -> discard */
104   inst = tgsi_default_full_instruction();
105   inst.Instruction.Opcode = TGSI_OPCODE_KILL_IF;
106   inst.Instruction.NumDstRegs = 0;
107   inst.Instruction.NumSrcRegs = 1;
108
109   inst.Src[0].Register.File  = TGSI_FILE_TEMPORARY;
110   inst.Src[0].Register.Index = 0;
111   inst.Src[0].Register.Negate = 1;
112   inst.Src[0].Register.SwizzleX = TGSI_SWIZZLE_X;
113   if (ctx->swizzle_xxxx) {
114      inst.Src[0].Register.SwizzleY = TGSI_SWIZZLE_X;
115      inst.Src[0].Register.SwizzleZ = TGSI_SWIZZLE_X;
116      inst.Src[0].Register.SwizzleW = TGSI_SWIZZLE_X;
117   } else {
118      inst.Src[0].Register.SwizzleY = TGSI_SWIZZLE_Y;
119      inst.Src[0].Register.SwizzleZ = TGSI_SWIZZLE_Z;
120      inst.Src[0].Register.SwizzleW = TGSI_SWIZZLE_W;
121   }
122   tctx->emit_instruction(tctx, &inst);
123
124   /* And emit the instruction we got. */
125   tctx->emit_instruction(tctx, current_inst);
126}
127
128const struct tgsi_token *
129st_get_bitmap_shader(const struct tgsi_token *tokens,
130                     unsigned tex_target, unsigned sampler_index,
131                     bool use_texcoord, bool swizzle_xxxx)
132{
133   struct tgsi_bitmap_transform ctx;
134   struct tgsi_token *newtoks;
135   int newlen;
136
137   assert(tex_target == PIPE_TEXTURE_2D ||
138          tex_target == PIPE_TEXTURE_RECT);
139
140   memset(&ctx, 0, sizeof(ctx));
141   ctx.base.transform_instruction = transform_instr;
142   ctx.tex_target = tex_target;
143   ctx.sampler_index = sampler_index;
144   ctx.use_texcoord = use_texcoord;
145   ctx.swizzle_xxxx = swizzle_xxxx;
146   tgsi_scan_shader(tokens, &ctx.info);
147
148   newlen = tgsi_num_tokens(tokens) + 20;
149   newtoks = tgsi_alloc_tokens(newlen);
150   if (!newtoks)
151      return NULL;
152
153   tgsi_transform_shader(tokens, newtoks, newlen, &ctx.base);
154   return newtoks;
155}
156