[Mesa-dev] [PATCH 1/4] st/glsl_to_tgsi: simplify translate_tex_offset

[Nicolai Hähnle]

From: Nicolai Hähnle <nicolai.haehnle at amd.com>

This fixes a bug with offsets from uniforms which seems to have only been
noticed as a crash in piglit's
arb_gpu_shader5/compiler/builtin-functions/fs-gatherOffset-uniform-offset.frag
on radeonsi.

Cc: mesa-stable at lists.freedesktop.org
---
 src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 64 +++++++-----------------------
 1 file changed, 14 insertions(+), 50 deletions(-)

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index f721506..33c1f87 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -5661,74 +5661,38 @@ translate_src(struct st_translate *t, const st_src_reg *src_reg)
    if (src_reg->reladdr != NULL) {
       assert(src_reg->file != PROGRAM_TEMPORARY);
       src = ureg_src_indirect(src, ureg_src(t->address[0]));
    }
 
    return src;
 }
 
 static struct tgsi_texture_offset
 translate_tex_offset(struct st_translate *t,
-                     const st_src_reg *in_offset, int idx)
+                     const st_src_reg *in_offset)
 {
    struct tgsi_texture_offset offset;
-   struct ureg_src imm_src;
-   struct ureg_dst dst;
-   int array;
+   struct ureg_src src = translate_src(t, in_offset);
 
-   switch (in_offset->file) {
-   case PROGRAM_IMMEDIATE:
-      assert(in_offset->index >= 0 && in_offset->index < t->num_immediates);
-      imm_src = t->immediates[in_offset->index];
-
-      offset.File = imm_src.File;
-      offset.Index = imm_src.Index;
-      offset.SwizzleX = imm_src.SwizzleX;
-      offset.SwizzleY = imm_src.SwizzleY;
-      offset.SwizzleZ = imm_src.SwizzleZ;
-      offset.Padding = 0;
-      break;
-   case PROGRAM_INPUT:
-      imm_src = t->inputs[t->inputMapping[in_offset->index]];
-      offset.File = imm_src.File;
-      offset.Index = imm_src.Index;
-      offset.SwizzleX = GET_SWZ(in_offset->swizzle, 0);
-      offset.SwizzleY = GET_SWZ(in_offset->swizzle, 1);
-      offset.SwizzleZ = GET_SWZ(in_offset->swizzle, 2);
-      offset.Padding = 0;
-      break;
-   case PROGRAM_TEMPORARY:
-      imm_src = ureg_src(t->temps[in_offset->index]);
-      offset.File = imm_src.File;
-      offset.Index = imm_src.Index;
-      offset.SwizzleX = GET_SWZ(in_offset->swizzle, 0);
-      offset.SwizzleY = GET_SWZ(in_offset->swizzle, 1);
-      offset.SwizzleZ = GET_SWZ(in_offset->swizzle, 2);
-      offset.Padding = 0;
-      break;
-   case PROGRAM_ARRAY:
-      array = in_offset->index >> 16;
+   offset.File = src.File;
+   offset.Index = src.Index;
+   offset.SwizzleX = src.SwizzleX;
+   offset.SwizzleY = src.SwizzleY;
+   offset.SwizzleZ = src.SwizzleZ;
+   offset.Padding = 0;
 
-      assert(array >= 0);
-      assert(array < (int)t->num_temp_arrays);
+   assert(!src.Indirect);
+   assert(!src.DimIndirect);
+   assert(!src.Dimension);
+   assert(!src.Absolute); /* those shouldn't be used with integers anyway */
+   assert(!src.Negate);
 
-      dst = t->arrays[array];
-      offset.File = dst.File;
-      offset.Index = dst.Index + (in_offset->index & 0xFFFF) - 0x8000;
-      offset.SwizzleX = GET_SWZ(in_offset->swizzle, 0);
-      offset.SwizzleY = GET_SWZ(in_offset->swizzle, 1);
-      offset.SwizzleZ = GET_SWZ(in_offset->swizzle, 2);
-      offset.Padding = 0;
-      break;
-   default:
-      break;
-   }
    return offset;
 }
 
 static void
 compile_tgsi_instruction(struct st_translate *t,
                          const glsl_to_tgsi_instruction *inst)
 {
    struct ureg_program *ureg = t->ureg;
    int i;
    struct ureg_dst dst[2];
@@ -5778,21 +5742,21 @@ compile_tgsi_instruction(struct st_translate *t,
    case TGSI_OPCODE_TXL2:
    case TGSI_OPCODE_TG4:
    case TGSI_OPCODE_LODQ:
       src[num_src] = t->samplers[inst->sampler.index];
       assert(src[num_src].File != TGSI_FILE_NULL);
       if (inst->sampler.reladdr)
          src[num_src] =
             ureg_src_indirect(src[num_src], ureg_src(t->address[2]));
       num_src++;
       for (i = 0; i < (int)inst->tex_offset_num_offset; i++) {
-         texoffsets[i] = translate_tex_offset(t, &inst->tex_offsets[i], i);
+         texoffsets[i] = translate_tex_offset(t, &inst->tex_offsets[i]);
       }
       tex_target = st_translate_texture_target(inst->tex_target, inst->tex_shadow);
 
       ureg_tex_insn(ureg,
                     inst->op,
                     dst, num_dst,
                     tex_target,
                     texoffsets, inst->tex_offset_num_offset,
                     src, num_src);
       return;
-- 
2.7.4