Merge branch 'james/fix-shiny-shader-nvidia' into 'master'

Fixed NVidia shiny water shader bug and re-enabled in settings

See merge request veloren/veloren!1319

assets/voxygen/shaders/fluid-frag/shiny.glsl

@@ -132,7 +132,11 @@ void main() {
 	float wave10 = wave_height(wave_pos + vec3(0.1, 0, 0));
 	float wave01 = wave_height(wave_pos + vec3(0, 0.1, 0));
 
-	float slope = abs(wave00 - wave10) * abs(wave00 - wave01);
+    // Possibility of div by zero when slope = 0,
+    // however this only results in no water surface appearing
+    // and is not likely to occur (could not find any occurrences)
+    float slope = abs(wave00 - wave10) * abs(wave00 - wave01);
+
 	vec3 nmap = vec3(
 		-(wave10 - wave00) / 0.1,
 		-(wave01 - wave00) / 0.1,
@@ -151,7 +155,7 @@ void main() {
     float f_alt = f_pos.z;
 #endif
 
-    float fluid_alt = max(ceil(f_pos.z), floor(f_alt));// f_alt;//max(f_alt - f_pos.z, 0.0);
+    float fluid_alt = mix(f_pos.z, f_alt, f_norm.z == 0);
     const float alpha = 0.255/*/ / 4.0*//* / 4.0 / sqrt(2.0)*/;
     const float n2 = 1.3325;
     const float R_s2s0 = pow((1.0 - n2) / (1.0 + n2), 2);

voxygen/src/hud/settings_window.rs

@@ -2064,18 +2064,14 @@ impl<'a> Widget for SettingsWindow<'a> {
             .color(TEXT_COLOR)
             .set(state.ids.fluid_mode_text, ui);
 
-            // FIXME: Add shiny water back to the UI once we fix the bug on nVidia cards.
-            let mode_list = [
-                FluidMode::Cheap,
-                // FluidMode::Shiny
-            ];
+            let mode_list = [FluidMode::Cheap, FluidMode::Shiny];
             let mode_label_list = [
                 &self
                     .localized_strings
                     .get("hud.settings.fluid_rendering_mode.cheap"),
-                /* &self
-                .localized_strings
-                .get("hud.settings.fluid_rendering_mode.shiny"), */
+                &self
+                    .localized_strings
+                    .get("hud.settings.fluid_rendering_mode.shiny"),
             ];
 
             // Get which fluid rendering mode is currently active

voxygen/src/render/mod.rs

@@ -171,7 +171,7 @@ pub enum FluidMode {
 }
 
 impl Default for FluidMode {
-    fn default() -> Self { FluidMode::Cheap }
+    fn default() -> Self { FluidMode::Shiny }
 }
 
 /// Lighting modes