virgl_tgsi.c revision 01e04c3f 
1/*
2 * Copyright 2014, 2015 Red Hat.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * on the rights to use, copy, modify, merge, publish, distribute, sub
8 * license, and/or sell copies of the Software, and to permit persons to whom
9 * the Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
21 * USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24/* the virgl hw tgsi vs what the current gallium want will diverge over time.
25   so add a transform stage to remove things we don't want to send unless
26   the receiver supports it.
27*/
28#include "tgsi/tgsi_transform.h"
29#include "virgl_context.h"
30#include "virgl_screen.h"
31struct virgl_transform_context {
32   struct tgsi_transform_context base;
33   bool cull_enabled;
34   bool has_precise;
35};
36
37static void
38virgl_tgsi_transform_declaration(struct tgsi_transform_context *ctx,
39                                 struct tgsi_full_declaration *decl)
40{
41   switch (decl->Declaration.File) {
42   case TGSI_FILE_CONSTANT:
43      if (decl->Declaration.Dimension) {
44         if (decl->Dim.Index2D == 0)
45            decl->Declaration.Dimension = 0;
46      }
47      break;
48   default:
49      break;
50   }
51   ctx->emit_declaration(ctx, decl);
52
53}
54
55/* for now just strip out the new properties the remote doesn't understand
56   yet */
57static void
58virgl_tgsi_transform_property(struct tgsi_transform_context *ctx,
59                              struct tgsi_full_property *prop)
60{
61   struct virgl_transform_context *vtctx = (struct virgl_transform_context *)ctx;
62   switch (prop->Property.PropertyName) {
63   case TGSI_PROPERTY_NUM_CLIPDIST_ENABLED:
64   case TGSI_PROPERTY_NUM_CULLDIST_ENABLED:
65      if (vtctx->cull_enabled)
66	 ctx->emit_property(ctx, prop);
67      break;
68   case TGSI_PROPERTY_NEXT_SHADER:
69      break;
70   default:
71      ctx->emit_property(ctx, prop);
72      break;
73   }
74}
75
76static void
77virgl_tgsi_transform_instruction(struct tgsi_transform_context *ctx,
78				 struct tgsi_full_instruction *inst)
79{
80   struct virgl_transform_context *vtctx = (struct virgl_transform_context *)ctx;
81   if (!vtctx->has_precise && inst->Instruction.Precise)
82      inst->Instruction.Precise = 0;
83
84   for (unsigned i = 0; i < inst->Instruction.NumSrcRegs; i++) {
85      if (inst->Src[i].Register.File == TGSI_FILE_CONSTANT &&
86          inst->Src[i].Register.Dimension &&
87          inst->Src[i].Dimension.Index == 0)
88         inst->Src[i].Register.Dimension = 0;
89   }
90   ctx->emit_instruction(ctx, inst);
91}
92
93struct tgsi_token *virgl_tgsi_transform(struct virgl_context *vctx, const struct tgsi_token *tokens_in)
94{
95   struct virgl_screen *vscreen = (struct virgl_screen *)vctx->base.screen;
96   struct virgl_transform_context transform;
97   const uint newLen = tgsi_num_tokens(tokens_in);
98   struct tgsi_token *new_tokens;
99
100   new_tokens = tgsi_alloc_tokens(newLen);
101   if (!new_tokens)
102      return NULL;
103
104   memset(&transform, 0, sizeof(transform));
105   transform.base.transform_declaration = virgl_tgsi_transform_declaration;
106   transform.base.transform_property = virgl_tgsi_transform_property;
107   transform.base.transform_instruction = virgl_tgsi_transform_instruction;
108   transform.cull_enabled = vscreen->caps.caps.v1.bset.has_cull;
109   transform.has_precise = vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_TGSI_PRECISE;
110   tgsi_transform_shader(tokens_in, new_tokens, newLen, &transform.base);
111
112   return new_tokens;
113}
114