u_surfaces: add util_surfaces_peek

[mesa.git] / src / gallium / auxiliary / tgsi / tgsi_util.c

diff --git a/src/gallium/auxiliary/tgsi/tgsi_util.c b/src/gallium/auxiliary/tgsi/tgsi_util.c
index 3544011b47202e4ce5eb66cfd0334ef8f5e096a5..3ec54964169bd528bed0407e0ef233fd74a300b3 100644 (file)
--- a/src/gallium/auxiliary/tgsi/tgsi_util.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_util.c
@@ -28,7 +28,6 @@
 #include "util/u_debug.h"
 #include "pipe/p_shader_tokens.h"
 #include "tgsi_parse.h"
-#include "tgsi_build.h"
 #include "tgsi_util.h"
 
 union pointer_hack
@@ -76,7 +75,7 @@ tgsi_util_get_full_src_register_swizzle(
    unsigned component )
 {
    return tgsi_util_get_src_register_swizzle(
-      &reg->SrcRegister,
+      &reg->Register,
       component );
 }
 
@@ -111,10 +110,10 @@ tgsi_util_get_full_src_register_sign_mode(
 {
    unsigned sign_mode;
 
-   if( reg->SrcRegister.Absolute ) {
+   if( reg->Register.Absolute ) {
       /* Consider only the post-abs negation. */
 
-      if( reg->SrcRegister.Negate ) {
+      if( reg->Register.Negate ) {
          sign_mode = TGSI_UTIL_SIGN_SET;
       }
       else {
@@ -122,7 +121,7 @@ tgsi_util_get_full_src_register_sign_mode(
       }
    }
    else {
-      if( reg->SrcRegister.Negate ) {
+      if( reg->Register.Negate ) {
          sign_mode = TGSI_UTIL_SIGN_TOGGLE;
       }
       else {
@@ -141,26 +140,172 @@ tgsi_util_set_full_src_register_sign_mode(
    switch (sign_mode)
    {
    case TGSI_UTIL_SIGN_CLEAR:
-      reg->SrcRegister.Negate = 0;
-      reg->SrcRegister.Absolute = 1;
+      reg->Register.Negate = 0;
+      reg->Register.Absolute = 1;
       break;
 
    case TGSI_UTIL_SIGN_SET:
-      reg->SrcRegister.Absolute = 1;
-      reg->SrcRegister.Negate = 1;
+      reg->Register.Absolute = 1;
+      reg->Register.Negate = 1;
       break;
 
    case TGSI_UTIL_SIGN_TOGGLE:
-      reg->SrcRegister.Negate = 1;
-      reg->SrcRegister.Absolute = 0;
+      reg->Register.Negate = 1;
+      reg->Register.Absolute = 0;
       break;
 
    case TGSI_UTIL_SIGN_KEEP:
-      reg->SrcRegister.Negate = 0;
-      reg->SrcRegister.Absolute = 0;
+      reg->Register.Negate = 0;
+      reg->Register.Absolute = 0;
       break;
 
    default:
       assert( 0 );
    }
 }
+
+/**
+ * Determine which channels of the specificed src register are effectively
+ * used by this instruction.
+ */
+unsigned
+tgsi_util_get_inst_usage_mask(const struct tgsi_full_instruction *inst,
+                              unsigned src_idx)
+{
+   const struct tgsi_full_src_register *src = &inst->Src[src_idx];
+   unsigned write_mask = inst->Dst[0].Register.WriteMask;
+   unsigned read_mask;
+   unsigned usage_mask;
+   unsigned chan;
+
+   switch (inst->Instruction.Opcode) {
+   case TGSI_OPCODE_MOV:
+   case TGSI_OPCODE_ARL:
+   case TGSI_OPCODE_ARR:
+   case TGSI_OPCODE_RCP:
+   case TGSI_OPCODE_MUL:
+   case TGSI_OPCODE_DIV:
+   case TGSI_OPCODE_ADD:
+   case TGSI_OPCODE_MIN:
+   case TGSI_OPCODE_MAX:
+   case TGSI_OPCODE_SLT:
+   case TGSI_OPCODE_SGE:
+   case TGSI_OPCODE_MAD:
+   case TGSI_OPCODE_SUB:
+   case TGSI_OPCODE_LRP:
+   case TGSI_OPCODE_CND:
+   case TGSI_OPCODE_FRC:
+   case TGSI_OPCODE_CEIL:
+   case TGSI_OPCODE_CLAMP:
+   case TGSI_OPCODE_FLR:
+   case TGSI_OPCODE_ROUND:
+   case TGSI_OPCODE_POW:
+   case TGSI_OPCODE_ABS:
+   case TGSI_OPCODE_COS:
+   case TGSI_OPCODE_SIN:
+   case TGSI_OPCODE_DDX:
+   case TGSI_OPCODE_DDY:
+   case TGSI_OPCODE_SEQ:
+   case TGSI_OPCODE_SGT:
+   case TGSI_OPCODE_SLE:
+   case TGSI_OPCODE_SNE:
+   case TGSI_OPCODE_SSG:
+   case TGSI_OPCODE_CMP:
+   case TGSI_OPCODE_TRUNC:
+   case TGSI_OPCODE_NOT:
+   case TGSI_OPCODE_AND:
+   case TGSI_OPCODE_OR:
+   case TGSI_OPCODE_XOR:
+   case TGSI_OPCODE_SAD:
+      /* Channel-wise operations */
+      read_mask = write_mask;
+      break;
+
+   case TGSI_OPCODE_EX2:
+   case TGSI_OPCODE_LG2:
+   case TGSI_OPCODE_RCC:
+      read_mask = TGSI_WRITEMASK_X;
+      break;
+
+   case TGSI_OPCODE_SCS:
+      read_mask = write_mask & TGSI_WRITEMASK_XY ? TGSI_WRITEMASK_X : 0;
+      break;
+
+   case TGSI_OPCODE_EXP:
+   case TGSI_OPCODE_LOG:
+      read_mask = write_mask & TGSI_WRITEMASK_XYZ ? TGSI_WRITEMASK_X : 0;
+      break;
+
+   case TGSI_OPCODE_DP2A:
+      read_mask = src_idx == 2 ? TGSI_WRITEMASK_X : TGSI_WRITEMASK_XY;
+      break;
+
+   case TGSI_OPCODE_DP2:
+      read_mask = TGSI_WRITEMASK_XY;
+      break;
+
+   case TGSI_OPCODE_DP3:
+      read_mask = TGSI_WRITEMASK_XYZ;
+      break;
+
+   case TGSI_OPCODE_DP4:
+      read_mask = TGSI_WRITEMASK_XYZW;
+      break;
+
+   case TGSI_OPCODE_DPH:
+      read_mask = src_idx == 0 ? TGSI_WRITEMASK_XYZ : TGSI_WRITEMASK_XYZW;
+      break;
+
+   case TGSI_OPCODE_TEX:
+   case TGSI_OPCODE_TXD:
+   case TGSI_OPCODE_TXB:
+   case TGSI_OPCODE_TXL:
+   case TGSI_OPCODE_TXP:
+      if (src_idx == 0) {
+         switch (inst->Texture.Texture) {
+         case TGSI_TEXTURE_1D:
+         case TGSI_TEXTURE_SHADOW1D:
+            read_mask = TGSI_WRITEMASK_X;
+            break;
+
+         case TGSI_TEXTURE_2D:
+         case TGSI_TEXTURE_RECT:
+         case TGSI_TEXTURE_SHADOW2D:
+         case TGSI_TEXTURE_SHADOWRECT:
+            read_mask = TGSI_WRITEMASK_XY;
+            break;
+
+         case TGSI_TEXTURE_3D:
+         case TGSI_TEXTURE_CUBE:
+            read_mask = TGSI_WRITEMASK_XYZ;
+            break;
+
+         default:
+            assert(0);
+            read_mask = 0;
+         }
+
+         if (inst->Instruction.Opcode != TGSI_OPCODE_TEX) {
+            read_mask |= TGSI_WRITEMASK_W;
+         }
+      } else {
+         /* A safe approximation */
+         read_mask = TGSI_WRITEMASK_XYZW;
+      }
+      break;
+
+   default:
+      /* Assume all channels are read */
+      read_mask = TGSI_WRITEMASK_XYZW;
+      break;
+   }
+
+   usage_mask = 0;
+   for (chan = 0; chan < 4; ++chan) {
+      if (read_mask & (1 << chan)) {
+         usage_mask |= 1 << tgsi_util_get_full_src_register_swizzle(src, chan);
+      }
+   }
+
+   return usage_mask;
+}