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
29#include "tgsi/tgsi_transform.h"
30#include "tgsi/tgsi_info.h"
31#include "virgl_context.h"
32#include "virgl_screen.h"
33
34struct virgl_transform_context {
35   struct tgsi_transform_context base;
36   bool cull_enabled;
37   bool has_precise;
38   bool fake_fp64;
39};
40
41static void
42virgl_tgsi_transform_declaration(struct tgsi_transform_context *ctx,
43                                 struct tgsi_full_declaration *decl)
44{
45   switch (decl->Declaration.File) {
46   case TGSI_FILE_CONSTANT:
47      if (decl->Declaration.Dimension) {
48         if (decl->Dim.Index2D == 0)
49            decl->Declaration.Dimension = 0;
50      }
51      break;
52   default:
53      break;
54   }
55   ctx->emit_declaration(ctx, decl);
56
57}
58
59/* for now just strip out the new properties the remote doesn't understand
60   yet */
61static void
62virgl_tgsi_transform_property(struct tgsi_transform_context *ctx,
63                              struct tgsi_full_property *prop)
64{
65   struct virgl_transform_context *vtctx = (struct virgl_transform_context *)ctx;
66   switch (prop->Property.PropertyName) {
67   case TGSI_PROPERTY_NUM_CLIPDIST_ENABLED:
68   case TGSI_PROPERTY_NUM_CULLDIST_ENABLED:
69      if (vtctx->cull_enabled)
70	 ctx->emit_property(ctx, prop);
71      break;
72   case TGSI_PROPERTY_NEXT_SHADER:
73      break;
74   default:
75      ctx->emit_property(ctx, prop);
76      break;
77   }
78}
79
80static void
81virgl_tgsi_transform_instruction(struct tgsi_transform_context *ctx,
82				 struct tgsi_full_instruction *inst)
83{
84   struct virgl_transform_context *vtctx = (struct virgl_transform_context *)ctx;
85   if (vtctx->fake_fp64 &&
86       (tgsi_opcode_infer_src_type(inst->Instruction.Opcode, 0) == TGSI_TYPE_DOUBLE ||
87        tgsi_opcode_infer_dst_type(inst->Instruction.Opcode, 0) == TGSI_TYPE_DOUBLE)) {
88      debug_printf("VIRGL: ARB_gpu_shader_fp64 is exposed but not supported.");
89      return;
90   }
91
92   if (!vtctx->has_precise && inst->Instruction.Precise)
93      inst->Instruction.Precise = 0;
94
95   for (unsigned i = 0; i < inst->Instruction.NumSrcRegs; i++) {
96      if (inst->Src[i].Register.File == TGSI_FILE_CONSTANT &&
97          inst->Src[i].Register.Dimension &&
98          inst->Src[i].Dimension.Index == 0)
99         inst->Src[i].Register.Dimension = 0;
100   }
101   ctx->emit_instruction(ctx, inst);
102}
103
104struct tgsi_token *virgl_tgsi_transform(struct virgl_screen *vscreen, const struct tgsi_token *tokens_in)
105{
106   struct virgl_transform_context transform;
107   const uint newLen = tgsi_num_tokens(tokens_in);
108   struct tgsi_token *new_tokens;
109
110   new_tokens = tgsi_alloc_tokens(newLen);
111   if (!new_tokens)
112      return NULL;
113
114   memset(&transform, 0, sizeof(transform));
115   transform.base.transform_declaration = virgl_tgsi_transform_declaration;
116   transform.base.transform_property = virgl_tgsi_transform_property;
117   transform.base.transform_instruction = virgl_tgsi_transform_instruction;
118   transform.cull_enabled = vscreen->caps.caps.v1.bset.has_cull;
119   transform.has_precise = vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_TGSI_PRECISE;
120   transform.fake_fp64 =
121      vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_FAKE_FP64;
122   tgsi_transform_shader(tokens_in, new_tokens, newLen, &transform.base);
123
124   return new_tokens;
125}
126