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