From a6daed74f58a37bfddd32bc1e0503013cd32df13 Mon Sep 17 00:00:00 2001
From: heapo <heapo3@gmail.com>
Date: Sun, 16 Dec 2018 09:34:24 -0800
Subject: [PATCH] Fix arrayed shadow sampler array slice/depth comparison
 ordering, as well as invalid GLSL LOD selection.

---
 .../renderer_opengl/gl_shader_decompiler.cpp  | 30 +++++++++----------
 1 file changed, 14 insertions(+), 16 deletions(-)

diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
index a5cfa0070b..708c7b4e9d 100644
--- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
@@ -1591,23 +1591,21 @@ private:
                                 process_mode == Tegra::Shader::TextureProcessMode::LL ||
                                 process_mode == Tegra::Shader::TextureProcessMode::LLA;
 
+        // LOD selection (either via bias or explicit textureLod) not supported in GL for
+        // sampler2DArrayShadow and samplerCubeArrayShadow.
         const bool gl_lod_supported = !(
             (texture_type == Tegra::Shader::TextureType::Texture2D && is_array && depth_compare) ||
-            (texture_type == Tegra::Shader::TextureType::TextureCube && !is_array &&
-             depth_compare));
+            (texture_type == Tegra::Shader::TextureType::TextureCube && is_array && depth_compare));
 
         const std::string read_method = lod_needed && gl_lod_supported ? "textureLod(" : "texture(";
         std::string texture = read_method + sampler + ", coord";
 
-        if (process_mode != Tegra::Shader::TextureProcessMode::None) {
+        UNIMPLEMENTED_IF(process_mode != Tegra::Shader::TextureProcessMode::None &&
+                         !gl_lod_supported);
+
+        if (process_mode != Tegra::Shader::TextureProcessMode::None && gl_lod_supported) {
             if (process_mode == Tegra::Shader::TextureProcessMode::LZ) {
-                if (gl_lod_supported) {
-                    texture += ", 0";
-                } else {
-                    // Lod 0 is emulated by a big negative bias
-                    // in scenarios that are not supported by glsl
-                    texture += ", -1000";
-                }
+                texture += ", 0.0";
             } else {
                 // If present, lod or bias are always stored in the register indexed by the
                 // gpr20
@@ -1645,15 +1643,15 @@ private:
         if (depth_compare && !is_array && texture_type == Tegra::Shader::TextureType::Texture1D) {
             coord += ",0.0";
         }
+        if (is_array) {
+            coord += ',' + regs.GetRegisterAsInteger(array_register);
+        }
         if (depth_compare) {
             // Depth is always stored in the register signaled by gpr20
             // or in the next register if lod or bias are used
             const u64 depth_register = instr.gpr20.Value() + (lod_bias_enabled ? 1 : 0);
             coord += ',' + regs.GetRegisterAsFloat(depth_register);
         }
-        if (is_array) {
-            coord += ',' + regs.GetRegisterAsInteger(array_register);
-        }
         coord += ");";
         return std::make_pair(
             coord, GetTextureCode(instr, texture_type, process_mode, depth_compare, is_array, 0));
@@ -1686,15 +1684,15 @@ private:
             }
         }
 
+        if (is_array) {
+            coord += ',' + regs.GetRegisterAsInteger(array_register);
+        }
         if (depth_compare) {
             // Depth is always stored in the register signaled by gpr20
             // or in the next register if lod or bias are used
             const u64 depth_register = instr.gpr20.Value() + (lod_bias_enabled ? 1 : 0);
             coord += ',' + regs.GetRegisterAsFloat(depth_register);
         }
-        if (is_array) {
-            coord += ',' + regs.GetRegisterAsInteger(array_register);
-        }
         coord += ");";
 
         return std::make_pair(coord,