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
35 struct 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
45 static inline struct tgsi_bitmap_transform *
tgsi_bitmap_transform(struct tgsi_transform_context * tctx)46 tgsi_bitmap_transform(struct tgsi_transform_context *tctx)
47 {
48 return (struct tgsi_bitmap_transform *)tctx;
49 }
50
51 static void
transform_instr(struct tgsi_transform_context * tctx,struct tgsi_full_instruction * current_inst)52 transform_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
129 const struct tgsi_token *
st_get_bitmap_shader(const struct tgsi_token * tokens,unsigned tex_target,unsigned sampler_index,bool use_texcoord,bool swizzle_xxxx)130 st_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