glsl: don't lower precision of textureSize

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5746>

src/compiler/glsl/lower_precision.cpp

@@ -457,6 +457,10 @@ is_lowerable_builtin(ir_call *ir,
        * uses lower precision. The function parameters don't matter.
        */
       if (var && var->type->without_array()->is_sampler()) {
+         /* textureSize always returns highp. */
+         if (!strcmp(ir->callee_name(), "textureSize"))
+            return false;
+
          return var->data.precision == GLSL_PRECISION_MEDIUM ||
                 var->data.precision == GLSL_PRECISION_LOW;
       }

src/compiler/glsl/tests/lower_precision_test.py

@@ -1161,6 +1161,21 @@ TESTS = [
          }
          """,
          r'\(expression +f16vec4 +dFdy +\(expression +f16vec4'),
+    Test("textureSize",
+         """
+         #version 310 es
+         precision mediump float;
+         precision mediump int;
+
+         uniform mediump sampler2D tex;
+         out ivec2 color;
+
+         void main()
+         {
+                 color = textureSize(tex, 0) * ivec2(2);
+         }
+         """,
+         r'expression ivec2 \* \(txs ivec2 \(var_ref tex'),
 ]