[Mesa-dev] [PATCH 4/5] gallivm: add texture target information for sample opcodes to tgsi info

[sroland at vmware.com]

From: Roland Scheidegger <sroland at vmware.com>

sample opcodes don't have valid texture target information (and I don't think
this should be changed), however it would be nice if we had that information
ready elsewhere, so stuff that information into the tgsi info when analyzing
a shader.
---
 src/gallium/auxiliary/gallivm/lp_bld_tgsi_info.c | 41 ++++++++++++++++++++----
 1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_info.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_info.c
index 3bbf260..7da76fc 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_info.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_info.c
@@ -48,6 +48,7 @@ struct analysis_context
 
    unsigned num_imms;
    float imm[LP_MAX_TGSI_IMMEDIATES][4];
+   unsigned sample_target[PIPE_MAX_SHADER_SAMPLER_VIEWS];
 
    struct lp_tgsi_channel_info temp[32][4];
 };
@@ -207,17 +208,36 @@ analyse_sample(struct analysis_context *ctx,
 
    if (info->num_texs < Elements(info->tex)) {
       struct lp_tgsi_texture_info *tex_info = &info->tex[info->num_texs];
+      unsigned target = ctx->sample_target[inst->Src[1].Register.Index];
       boolean indirect = FALSE;
       boolean shadow = FALSE;
       unsigned readmask;
 
-      /*
-       * We don't really get much information here, in particular not
-       * the target info, hence no useful writemask neither. Maybe should just
-       * forget the whole function.
-       */
-      readmask = TGSI_WRITEMASK_XYZW;
+      switch (target) {
+      /* note no shadow targets here */
+      case TGSI_TEXTURE_BUFFER:
+      case TGSI_TEXTURE_1D:
+         readmask = TGSI_WRITEMASK_X;
+         break;
+      case TGSI_TEXTURE_1D_ARRAY:
+      case TGSI_TEXTURE_2D:
+      case TGSI_TEXTURE_RECT:
+         readmask = TGSI_WRITEMASK_XY;
+         break;
+      case TGSI_TEXTURE_2D_ARRAY:
+      case TGSI_TEXTURE_3D:
+      case TGSI_TEXTURE_CUBE:
+         readmask = TGSI_WRITEMASK_XYZ;
+         break;
+      case TGSI_TEXTURE_CUBE_ARRAY:
+         readmask = TGSI_WRITEMASK_XYZW;
+         break;
+      default:
+         assert(0);
+         return;
+      }
 
+      tex_info->target = target;
       tex_info->texture_unit = inst->Src[1].Register.Index;
       tex_info->sampler_unit = inst->Src[2].Register.Index;
 
@@ -524,7 +544,14 @@ lp_build_tgsi_info(const struct tgsi_token *tokens,
       tgsi_parse_token(&parse);
 
       switch (parse.FullToken.Token.Type) {
-      case TGSI_TOKEN_TYPE_DECLARATION:
+      case TGSI_TOKEN_TYPE_DECLARATION: {
+         struct tgsi_full_declaration *decl = &parse.FullToken.FullDeclaration;
+         if (decl->Declaration.File == TGSI_FILE_SAMPLER_VIEW) {
+            for (index = decl->Range.First; index <= decl->Range.Last; index++) {
+               ctx->sample_target[index] = decl->SamplerView.Resource;
+            }
+         }
+      }
          break;
 
       case TGSI_TOKEN_TYPE_INSTRUCTION:
-- 
1.9.1