draw: use tgsi transform prolog/epilog callbacks in AA line code

Reviewed-by: Charmaine Lee <charmainel@vmware.com>

diff --git a/src/gallium/auxiliary/draw/draw_pipe_aaline.c b/src/gallium/auxiliary/draw/draw_pipe_aaline.c
index 8955762ce27e450eba372617f08b7786b2e172f2..c8344dd427b4b96a4f369ac244a24360e15af7c1 100644 (file)
--- a/src/gallium/auxiliary/draw/draw_pipe_aaline.c
+++ b/src/gallium/auxiliary/draw/draw_pipe_aaline.c
@@ -140,7 +140,6 @@ struct aa_transform_context {
    int freeSampler;  /** an available sampler for the pstipple */
    int maxInput, maxGeneric;  /**< max input index found */
    int colorTemp, texTemp;  /**< temp registers */
-   boolean firstInstruction;
 };
 
 
@@ -197,80 +196,80 @@ free_bit(uint bitfield)
 
 
 /**
- * TGSI instruction transform callback.
- * Replace writes to result.color w/ a temp reg.
- * Upon END instruction, insert texture sampling code for antialiasing.
+ * TGSI transform prolog callback.
  */
 static void
-aa_transform_inst(struct tgsi_transform_context *ctx,
-                  struct tgsi_full_instruction *inst)
+aa_transform_prolog(struct tgsi_transform_context *ctx)
 {
    struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
+   struct tgsi_full_declaration decl;
+   uint i;
 
-   if (aactx->firstInstruction) {
-      /* emit our new declarations before the first instruction */
-
-      struct tgsi_full_declaration decl;
-      uint i;
-
-      /* find free sampler */
-      aactx->freeSampler = free_bit(aactx->samplersUsed);
-      if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
-         aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
-
-      /* find two free temp regs */
-      for (i = 0; i < 32; i++) {
-         if ((aactx->tempsUsed & (1 << i)) == 0) {
-            /* found a free temp */
-            if (aactx->colorTemp < 0)
-               aactx->colorTemp  = i;
-            else if (aactx->texTemp < 0)
-               aactx->texTemp  = i;
-            else
-               break;
-         }
+   /* find free sampler */
+   aactx->freeSampler = free_bit(aactx->samplersUsed);
+   if (aactx->freeSampler >= PIPE_MAX_SAMPLERS)
+      aactx->freeSampler = PIPE_MAX_SAMPLERS - 1;
+
+   /* find two free temp regs */
+   for (i = 0; i < 32; i++) {
+      if ((aactx->tempsUsed & (1 << i)) == 0) {
+      /* found a free temp */
+      if (aactx->colorTemp < 0)
+         aactx->colorTemp  = i;
+      else if (aactx->texTemp < 0)
+         aactx->texTemp  = i;
+      else
+         break;
       }
-      assert(aactx->colorTemp >= 0);
-      assert(aactx->texTemp >= 0);
-
-      /* declare new generic input/texcoord */
-      decl = tgsi_default_full_declaration();
-      decl.Declaration.File = TGSI_FILE_INPUT;
-      /* XXX this could be linear... */
-      decl.Declaration.Interpolate = 1;
-      decl.Declaration.Semantic = 1;
-      decl.Semantic.Name = TGSI_SEMANTIC_GENERIC;
-      decl.Semantic.Index = aactx->maxGeneric + 1;
-      decl.Range.First = 
-      decl.Range.Last = aactx->maxInput + 1;
-      decl.Interp.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
-      ctx->emit_declaration(ctx, &decl);
-
-      /* declare new sampler */
-      decl = tgsi_default_full_declaration();
-      decl.Declaration.File = TGSI_FILE_SAMPLER;
-      decl.Range.First = 
-      decl.Range.Last = aactx->freeSampler;
-      ctx->emit_declaration(ctx, &decl);
-
-      /* declare new temp regs */
-      decl = tgsi_default_full_declaration();
-      decl.Declaration.File = TGSI_FILE_TEMPORARY;
-      decl.Range.First = 
-      decl.Range.Last = aactx->texTemp;
-      ctx->emit_declaration(ctx, &decl);
-
-      decl = tgsi_default_full_declaration();
-      decl.Declaration.File = TGSI_FILE_TEMPORARY;
-      decl.Range.First = 
-      decl.Range.Last = aactx->colorTemp;
-      ctx->emit_declaration(ctx, &decl);
-
-      aactx->firstInstruction = FALSE;
    }
+   assert(aactx->colorTemp >= 0);
+   assert(aactx->texTemp >= 0);
+
+   /* declare new generic input/texcoord */
+   decl = tgsi_default_full_declaration();
+   decl.Declaration.File = TGSI_FILE_INPUT;
+   /* XXX this could be linear... */
+   decl.Declaration.Interpolate = 1;
+   decl.Declaration.Semantic = 1;
+   decl.Semantic.Name = TGSI_SEMANTIC_GENERIC;
+   decl.Semantic.Index = aactx->maxGeneric + 1;
+   decl.Range.First = 
+   decl.Range.Last = aactx->maxInput + 1;
+   decl.Interp.Interpolate = TGSI_INTERPOLATE_PERSPECTIVE;
+   ctx->emit_declaration(ctx, &decl);
+
+   /* declare new sampler */
+   decl = tgsi_default_full_declaration();
+   decl.Declaration.File = TGSI_FILE_SAMPLER;
+   decl.Range.First = 
+   decl.Range.Last = aactx->freeSampler;
+   ctx->emit_declaration(ctx, &decl);
+
+   /* declare new temp regs */
+   decl = tgsi_default_full_declaration();
+   decl.Declaration.File = TGSI_FILE_TEMPORARY;
+   decl.Range.First = 
+   decl.Range.Last = aactx->texTemp;
+   ctx->emit_declaration(ctx, &decl);
+
+   decl = tgsi_default_full_declaration();
+   decl.Declaration.File = TGSI_FILE_TEMPORARY;
+   decl.Range.First = 
+   decl.Range.Last = aactx->colorTemp;
+   ctx->emit_declaration(ctx, &decl);
+}
+
 
-   if (inst->Instruction.Opcode == TGSI_OPCODE_END &&
-       aactx->colorOutput != -1) {
+/**
+ * TGSI transform epilog callback.
+ */
+static void
+aa_transform_epilog(struct tgsi_transform_context *ctx)
+{
+   struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
+
+   if (aactx->colorOutput != -1) {
+      /* insert texture sampling code for antialiasing. */
       struct tgsi_full_instruction newInst;
 
       /* TEX */
@@ -286,7 +285,6 @@ aa_transform_inst(struct tgsi_transform_context *ctx,
       newInst.Src[0].Register.Index = aactx->maxInput + 1;
       newInst.Src[1].Register.File = TGSI_FILE_SAMPLER;
       newInst.Src[1].Register.Index = aactx->freeSampler;
-
       ctx->emit_instruction(ctx, &newInst);
 
       /* MOV rgb */
@@ -314,31 +312,34 @@ aa_transform_inst(struct tgsi_transform_context *ctx,
       newInst.Src[1].Register.File = TGSI_FILE_TEMPORARY;
       newInst.Src[1].Register.Index = aactx->texTemp;
       ctx->emit_instruction(ctx, &newInst);
-
-      /* END */
-      newInst = tgsi_default_full_instruction();
-      newInst.Instruction.Opcode = TGSI_OPCODE_END;
-      newInst.Instruction.NumDstRegs = 0;
-      newInst.Instruction.NumSrcRegs = 0;
-      ctx->emit_instruction(ctx, &newInst);
    }
-   else {
-      /* Not an END instruction.
-       * Look for writes to result.color and replace with colorTemp reg.
-       */
-      uint i;
+}
 
-      for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
-         struct tgsi_full_dst_register *dst = &inst->Dst[i];
-         if (dst->Register.File == TGSI_FILE_OUTPUT &&
-             dst->Register.Index == aactx->colorOutput) {
-            dst->Register.File = TGSI_FILE_TEMPORARY;
-            dst->Register.Index = aactx->colorTemp;
-         }
-      }
 
-      ctx->emit_instruction(ctx, inst);
+/**
+ * TGSI instruction transform callback.
+ * Replace writes to result.color w/ a temp reg.
+ */
+static void
+aa_transform_inst(struct tgsi_transform_context *ctx,
+                  struct tgsi_full_instruction *inst)
+{
+   struct aa_transform_context *aactx = (struct aa_transform_context *) ctx;
+   uint i;
+
+   /*
+    * Look for writes to result.color and replace with colorTemp reg.
+    */
+   for (i = 0; i < inst->Instruction.NumDstRegs; i++) {
+      struct tgsi_full_dst_register *dst = &inst->Dst[i];
+      if (dst->Register.File == TGSI_FILE_OUTPUT &&
+          dst->Register.Index == aactx->colorOutput) {
+         dst->Register.File = TGSI_FILE_TEMPORARY;
+         dst->Register.Index = aactx->colorTemp;
+      }
    }
+
+   ctx->emit_instruction(ctx, inst);
 }
 
 
@@ -366,7 +367,8 @@ generate_aaline_fs(struct aaline_stage *aaline)
    transform.maxGeneric = -1;
    transform.colorTemp = -1;
    transform.texTemp = -1;
-   transform.firstInstruction = TRUE;
+   transform.base.prolog = aa_transform_prolog;
+   transform.base.epilog = aa_transform_epilog;
    transform.base.transform_instruction = aa_transform_inst;
    transform.base.transform_declaration = aa_transform_decl;