src/gallium/drivers/virgl/virgl_tgsi.c

   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 struct virgl_transform_context {
  31    struct tgsi_transform_context base;
  32 };
  33
  34 static void
  35 virgl_tgsi_transform_declaration(struct tgsi_transform_context *ctx,
  36                                  struct tgsi_full_declaration *decl)
  37 {
  38    switch (decl->Declaration.File) {
  39    case TGSI_FILE_CONSTANT:
  40       if (decl->Declaration.Dimension) {
  41          if (decl->Dim.Index2D == 0)
  42             decl->Declaration.Dimension = 0;
  43       }
  44       break;
  45    default:
  46       break;
  47    }
  48    ctx->emit_declaration(ctx, decl);
  49
  50 }
  51
  52 /* for now just strip out the new properties the remote doesn't understand
  53    yet */
  54 static void
  55 virgl_tgsi_transform_property(struct tgsi_transform_context *ctx,
  56                               struct tgsi_full_property *prop)
  57 {
  58    switch (prop->Property.PropertyName) {
  59    case TGSI_PROPERTY_NUM_CLIPDIST_ENABLED:
  60    case TGSI_PROPERTY_NUM_CULLDIST_ENABLED:
  61    case TGSI_PROPERTY_NEXT_SHADER:
  62       break;
  63    default:
  64       ctx->emit_property(ctx, prop);
  65       break;
  66    }
  67 }
  68
  69 static void
  70 virgl_tgsi_transform_instruction(struct tgsi_transform_context *ctx,
  71                                  struct tgsi_full_instruction *inst)
  72 {
  73    if (inst->Instruction.Precise)
  74       inst->Instruction.Precise = 0;
  75
  76    for (unsigned i = 0; i < inst->Instruction.NumSrcRegs; i++) {
  77       if (inst->Src[i].Register.File == TGSI_FILE_CONSTANT &&
  78           inst->Src[i].Register.Dimension &&
  79           !inst->Src[i].Register.Indirect &&
  80           inst->Src[i].Dimension.Index == 0)
  81          inst->Src[i].Register.Dimension = 0;
  82    }
  83    ctx->emit_instruction(ctx, inst);
  84 }
  85
  86 struct tgsi_token *virgl_tgsi_transform(const struct tgsi_token *tokens_in)
  87 {
  88
  89    struct virgl_transform_context transform;
  90    const uint newLen = tgsi_num_tokens(tokens_in);
  91    struct tgsi_token *new_tokens;
  92
  93    new_tokens = tgsi_alloc_tokens(newLen);
  94    if (!new_tokens)
  95       return NULL;
  96
  97    memset(&transform, 0, sizeof(transform));
  98    transform.base.transform_declaration = virgl_tgsi_transform_declaration;
  99    transform.base.transform_property = virgl_tgsi_transform_property;
 100    transform.base.transform_instruction = virgl_tgsi_transform_instruction;
 101    tgsi_transform_shader(tokens_in, new_tokens, newLen, &transform.base);
 102
 103    return new_tokens;
 104 }