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
  29 #include "tgsi/tgsi_transform.h"
  30 #include "tgsi/tgsi_info.h"
  31 #include "virgl_context.h"
  32 #include "virgl_screen.h"
  33
  34 struct virgl_transform_context {
  35    struct tgsi_transform_context base;
  36    bool cull_enabled;
  37    bool has_precise;
  38    bool fake_fp64;
  39 };
  40
  41 static void
  42 virgl_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 */
  61 static void
  62 virgl_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
  80 static void
  81 virgl_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
 104 struct tgsi_token *virgl_tgsi_transform(struct virgl_context *vctx, const struct tgsi_token *tokens_in)
 105 {
 106    struct virgl_screen *vscreen = (struct virgl_screen *)vctx->base.screen;
 107    struct virgl_transform_context transform;
 108    const uint newLen = tgsi_num_tokens(tokens_in);
 109    struct tgsi_token *new_tokens;
 110
 111    new_tokens = tgsi_alloc_tokens(newLen);
 112    if (!new_tokens)
 113       return NULL;
 114
 115    memset(&transform, 0, sizeof(transform));
 116    transform.base.transform_declaration = virgl_tgsi_transform_declaration;
 117    transform.base.transform_property = virgl_tgsi_transform_property;
 118    transform.base.transform_instruction = virgl_tgsi_transform_instruction;
 119    transform.cull_enabled = vscreen->caps.caps.v1.bset.has_cull;
 120    transform.has_precise = vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_TGSI_PRECISE;
 121    transform.fake_fp64 =
 122       vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_FAKE_FP64;
 123    tgsi_transform_shader(tokens_in, new_tokens, newLen, &transform.base);
 124
 125    return new_tokens;
 126 }