Exposure emulated *Unorm4x8 glsl functions in non-android builds

Originally these functions were exposed on all GLSL ES 300 devices. However, that causes a build error as Android devices expose the *Unorm4x8 functions despite them not being in the ES 300 spec

drivers/gles3/shaders/canvas.glsl

@@ -288,11 +288,9 @@ vec3 light_normal_compute(vec3 light_vec, vec3 normal, vec3 base_color, vec3 lig
 
 #endif
 
-#define SHADOW_TEST(m_uv)                              \
-	{                                                  \
-		highp float sd = SHADOW_DEPTH(m_uv);           \
-		shadow += step(sd, shadow_uv.z / shadow_uv.w); \
-	}
+/* clang-format off */
+#define SHADOW_TEST(m_uv) { highp float sd = SHADOW_DEPTH(m_uv); shadow += step(sd, shadow_uv.z / shadow_uv.w); }
+/* clang-format on */
 
 //float distance = length(shadow_pos);
 vec4 light_shadow_compute(uint light_base, vec4 light_color, vec4 shadow_uv
@@ -332,7 +330,7 @@ vec4 light_shadow_compute(uint light_base, vec4 light_color, vec4 shadow_uv
 		shadow /= 13.0;
 	}
 
-	vec4 shadow_color = unpackUnorm4x8(light_array[light_base].shadow_color);
+	vec4 shadow_color = godot_unpackUnorm4x8(light_array[light_base].shadow_color);
 #ifdef LIGHT_CODE_USED
 	shadow_color.rgb *= shadow_modulate;
 #endif
@@ -499,7 +497,7 @@ void main() {
 
 	if (specular_shininess_used || (using_light && normal_used && bool(draw_data[draw_data_instance].flags & FLAGS_DEFAULT_SPECULAR_MAP_USED))) {
 		specular_shininess = texture(specular_texture, uv);
-		specular_shininess *= unpackUnorm4x8(draw_data[draw_data_instance].specular_shininess);
+		specular_shininess *= godot_unpackUnorm4x8(draw_data[draw_data_instance].specular_shininess);
 		specular_shininess_used = true;
 	} else {
 		specular_shininess = vec4(1.0);

drivers/gles3/shaders/stdlib_inc.glsl

@@ -39,23 +39,32 @@ vec2 unpackSnorm2x16(uint p) {
 	return clamp((v - 32767.0) * vec2(0.00003051851), vec2(-1.0), vec2(1.0));
 }
 
-uint packUnorm4x8(vec4 v) {
+#endif
+
+// Compatibility renames. These are exposed with the "godot_" prefix
+// to work around an Adreno bug which was exposing these ES310 functions
+// in ES300 shaders. Internally, we must use the "godot_" prefix, but user shaders
+// will be mapped automatically.
+uint godot_packUnorm4x8(vec4 v) {
 	uvec4 uv = uvec4(round(clamp(v, vec4(0.0), vec4(1.0)) * 255.0));
 	return uv.x | (uv.y << uint(8)) | (uv.z << uint(16)) | (uv.w << uint(24));
 }
 
-vec4 unpackUnorm4x8(uint p) {
+vec4 godot_unpackUnorm4x8(uint p) {
 	return vec4(float(p & uint(0xff)), float((p >> uint(8)) & uint(0xff)), float((p >> uint(16)) & uint(0xff)), float(p >> uint(24))) * 0.00392156862; // 1.0 / 255.0
 }
 
-uint packSnorm4x8(vec4 v) {
+uint godot_packSnorm4x8(vec4 v) {
 	uvec4 uv = uvec4(round(clamp(v, vec4(-1.0), vec4(1.0)) * 127.0) + 127.0);
 	return uv.x | uv.y << uint(8) | uv.z << uint(16) | uv.w << uint(24);
 }
 
-vec4 unpackSnorm4x8(uint p) {
+vec4 godot_unpackSnorm4x8(uint p) {
 	vec4 v = vec4(float(p & uint(0xff)), float((p >> uint(8)) & uint(0xff)), float((p >> uint(16)) & uint(0xff)), float(p >> uint(24)));
 	return clamp((v - vec4(127.0)) * vec4(0.00787401574), vec4(-1.0), vec4(1.0));
 }
 
-#endif
+#define packUnorm4x8 godot_packUnorm4x8
+#define unpackUnorm4x8 godot_unpackUnorm4x8
+#define packSnorm4x8 godot_packSnorm4x8
+#define unpackSnorm4x8 godot_unpackSnorm4x8