shader: Correct coordinates for texelFetch of emulated RECT on GLES

Fixes: KHR-GL33.texture_size_promotion.functional

v2: Put bias at right position when offset is present
  Fixes piglit: texelFetch offset 140 fs isampler2DRect

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>

Reviewed-By: Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>

src/vrend_shader.c

@@ -2430,16 +2430,21 @@ static void translate_tex(struct dump_ctx *ctx,
    if (inst->Instruction.Opcode == TGSI_OPCODE_TXF) {
       if (ctx->cfg->use_gles &&
           (inst->Texture.Texture == TGSI_TEXTURE_1D ||
-           inst->Texture.Texture == TGSI_TEXTURE_1D_ARRAY)) {
+           inst->Texture.Texture == TGSI_TEXTURE_1D_ARRAY ||
+           inst->Texture.Texture == TGSI_TEXTURE_RECT)) {
          if (inst->Texture.Texture == TGSI_TEXTURE_1D)
             emit_buff(ctx, "%s = %s(%s(texelFetch%s(%s, ivec2(%s(%s%s), 0)%s%s)%s));\n",
                       dsts[0], get_string(dinfo->dstconv), get_string(dtypeprefix), tex_ext, srcs[sampler_index],
                   get_string(txfi), srcs[0], get_wm_string(twm), bias, offbuf, dinfo->dst_override_no_wm[0] ? "" : writemask);
-         else {
+         else if (inst->Texture.Texture == TGSI_TEXTURE_1D_ARRAY) {
             /* the y coordinate must go into the z element and the y must be zero */
             emit_buff(ctx, "%s = %s(%s(texelFetch%s(%s, ivec3(%s(%s%s), 0).xzy%s%s)%s));\n",
                       dsts[0], get_string(dinfo->dstconv), get_string(dtypeprefix), tex_ext, srcs[sampler_index],
                   get_string(txfi), srcs[0], get_wm_string(twm), bias, offbuf, dinfo->dst_override_no_wm[0] ? "" : writemask);
+         } else {
+            emit_buff(ctx, "%s = %s(%s(texelFetch%s(%s, %s(%s%s), 0%s)%s));\n",
+                      dsts[0], get_string(dinfo->dstconv), get_string(dtypeprefix), tex_ext, srcs[sampler_index],
+                  get_string(txfi), srcs[0], get_wm_string(twm), offbuf, dinfo->dst_override_no_wm[0] ? "" : writemask);
          }
       } else {
          emit_buff(ctx, "%s = %s(%s(texelFetch%s(%s, %s(%s%s)%s%s)%s));\n", dsts[0], get_string(dinfo->dstconv), get_string(dtypeprefix),