3 files changed, 164 insertions, 122 deletions

diff --git a/src/video_core/renderer_opengl/gl_rasterizer.h b/src/video_core/renderer_opengl/gl_rasterizer.h
index 82fa61742..4f9a032fb 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer.h
@@ -39,14 +39,24 @@ struct ScreenInfo;
  * directly accessing Pica registers. This should reduce the risk of bugs in shader generation where
  * Pica state is not being captured in the shader cache key, thereby resulting in (what should be)
  * two separate shaders sharing the same key.
+ *
+ * We use a union because "implicitly-defined copy/move constructor for a union X copies the object representation of X."
+ * and "implicitly-defined copy assignment operator for a union X copies the object representation (3.9) of X."
+ * = Bytewise copy instead of memberwise copy.
+ * This is important because the padding bytes are included in the hash and comparison between objects.
  */
-struct PicaShaderConfig {
+union PicaShaderConfig {
+
     /// Construct a PicaShaderConfig with the current Pica register configuration.
     static PicaShaderConfig CurrentConfig() {
         PicaShaderConfig res;
+
+        auto& state = res.state;
+        std::memset(&state, 0, sizeof(PicaShaderConfig::State));
+
         const auto& regs = Pica::g_state.regs;
 
-        res.alpha_test_func = regs.output_merger.alpha_test.enable ?
+        state.alpha_test_func = regs.output_merger.alpha_test.enable ?
             regs.output_merger.alpha_test.func.Value() : Pica::Regs::CompareFunc::Always;
 
         // Copy relevant tev stages fields.
@@ -56,123 +66,151 @@ struct PicaShaderConfig {
         DEBUG_ASSERT(res.tev_stages.size() == tev_stages.size());
         for (size_t i = 0; i < tev_stages.size(); i++) {
             const auto& tev_stage = tev_stages[i];
-            res.tev_stages[i].sources_raw = tev_stage.sources_raw;
-            res.tev_stages[i].modifiers_raw = tev_stage.modifiers_raw;
-            res.tev_stages[i].ops_raw = tev_stage.ops_raw;
-            res.tev_stages[i].scales_raw = tev_stage.scales_raw;
+            state.tev_stages[i].sources_raw = tev_stage.sources_raw;
+            state.tev_stages[i].modifiers_raw = tev_stage.modifiers_raw;
+            state.tev_stages[i].ops_raw = tev_stage.ops_raw;
+            state.tev_stages[i].scales_raw = tev_stage.scales_raw;
         }
 
-        res.combiner_buffer_input =
+        state.combiner_buffer_input =
             regs.tev_combiner_buffer_input.update_mask_rgb.Value() |
             regs.tev_combiner_buffer_input.update_mask_a.Value() << 4;
 
         // Fragment lighting
 
-        res.lighting.enable = !regs.lighting.disable;
-        res.lighting.src_num = regs.lighting.num_lights + 1;
+        state.lighting.enable = !regs.lighting.disable;
+        state.lighting.src_num = regs.lighting.num_lights + 1;
 
-        for (unsigned light_index = 0; light_index < res.lighting.src_num; ++light_index) {
+        for (unsigned light_index = 0; light_index < state.lighting.src_num; ++light_index) {
             unsigned num = regs.lighting.light_enable.GetNum(light_index);
             const auto& light = regs.lighting.light[num];
-            res.lighting.light[light_index].num = num;
-            res.lighting.light[light_index].directional = light.directional != 0;
-            res.lighting.light[light_index].two_sided_diffuse = light.two_sided_diffuse != 0;
-            res.lighting.light[light_index].dist_atten_enable = !regs.lighting.IsDistAttenDisabled(num);
-            res.lighting.light[light_index].dist_atten_bias = Pica::float20::FromRaw(light.dist_atten_bias).ToFloat32();
-            res.lighting.light[light_index].dist_atten_scale = Pica::float20::FromRaw(light.dist_atten_scale).ToFloat32();
+            state.lighting.light[light_index].num = num;
+            state.lighting.light[light_index].directional = light.directional != 0;
+            state.lighting.light[light_index].two_sided_diffuse = light.two_sided_diffuse != 0;
+            state.lighting.light[light_index].dist_atten_enable = !regs.lighting.IsDistAttenDisabled(num);
+            state.lighting.light[light_index].dist_atten_bias = Pica::float20::FromRaw(light.dist_atten_bias).ToFloat32();
+            state.lighting.light[light_index].dist_atten_scale = Pica::float20::FromRaw(light.dist_atten_scale).ToFloat32();
         }
 
-        res.lighting.lut_d0.enable = regs.lighting.disable_lut_d0 == 0;
-        res.lighting.lut_d0.abs_input = regs.lighting.abs_lut_input.disable_d0 == 0;
-        res.lighting.lut_d0.type = regs.lighting.lut_input.d0.Value();
-        res.lighting.lut_d0.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.d0);
-
-        res.lighting.lut_d1.enable = regs.lighting.disable_lut_d1 == 0;
-        res.lighting.lut_d1.abs_input = regs.lighting.abs_lut_input.disable_d1 == 0;
-        res.lighting.lut_d1.type = regs.lighting.lut_input.d1.Value();
-        res.lighting.lut_d1.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.d1);
-
-        res.lighting.lut_fr.enable = regs.lighting.disable_lut_fr == 0;
-        res.lighting.lut_fr.abs_input = regs.lighting.abs_lut_input.disable_fr == 0;
-        res.lighting.lut_fr.type = regs.lighting.lut_input.fr.Value();
-        res.lighting.lut_fr.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.fr);
-
-        res.lighting.lut_rr.enable = regs.lighting.disable_lut_rr == 0;
-        res.lighting.lut_rr.abs_input = regs.lighting.abs_lut_input.disable_rr == 0;
-        res.lighting.lut_rr.type = regs.lighting.lut_input.rr.Value();
-        res.lighting.lut_rr.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.rr);
-
-        res.lighting.lut_rg.enable = regs.lighting.disable_lut_rg == 0;
-        res.lighting.lut_rg.abs_input = regs.lighting.abs_lut_input.disable_rg == 0;
-        res.lighting.lut_rg.type = regs.lighting.lut_input.rg.Value();
-        res.lighting.lut_rg.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.rg);
-
-        res.lighting.lut_rb.enable = regs.lighting.disable_lut_rb == 0;
-        res.lighting.lut_rb.abs_input = regs.lighting.abs_lut_input.disable_rb == 0;
-        res.lighting.lut_rb.type = regs.lighting.lut_input.rb.Value();
-        res.lighting.lut_rb.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.rb);
-
-        res.lighting.config = regs.lighting.config;
-        res.lighting.fresnel_selector = regs.lighting.fresnel_selector;
-        res.lighting.bump_mode = regs.lighting.bump_mode;
-        res.lighting.bump_selector = regs.lighting.bump_selector;
-        res.lighting.bump_renorm = regs.lighting.disable_bump_renorm == 0;
-        res.lighting.clamp_highlights = regs.lighting.clamp_highlights != 0;
+        state.lighting.lut_d0.enable = regs.lighting.disable_lut_d0 == 0;
+        state.lighting.lut_d0.abs_input = regs.lighting.abs_lut_input.disable_d0 == 0;
+        state.lighting.lut_d0.type = regs.lighting.lut_input.d0.Value();
+        state.lighting.lut_d0.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.d0);
+
+        state.lighting.lut_d1.enable = regs.lighting.disable_lut_d1 == 0;
+        state.lighting.lut_d1.abs_input = regs.lighting.abs_lut_input.disable_d1 == 0;
+        state.lighting.lut_d1.type = regs.lighting.lut_input.d1.Value();
+        state.lighting.lut_d1.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.d1);
+
+        state.lighting.lut_fr.enable = regs.lighting.disable_lut_fr == 0;
+        state.lighting.lut_fr.abs_input = regs.lighting.abs_lut_input.disable_fr == 0;
+        state.lighting.lut_fr.type = regs.lighting.lut_input.fr.Value();
+        state.lighting.lut_fr.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.fr);
+
+        state.lighting.lut_rr.enable = regs.lighting.disable_lut_rr == 0;
+        state.lighting.lut_rr.abs_input = regs.lighting.abs_lut_input.disable_rr == 0;
+        state.lighting.lut_rr.type = regs.lighting.lut_input.rr.Value();
+        state.lighting.lut_rr.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.rr);
+
+        state.lighting.lut_rg.enable = regs.lighting.disable_lut_rg == 0;
+        state.lighting.lut_rg.abs_input = regs.lighting.abs_lut_input.disable_rg == 0;
+        state.lighting.lut_rg.type = regs.lighting.lut_input.rg.Value();
+        state.lighting.lut_rg.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.rg);
+
+        state.lighting.lut_rb.enable = regs.lighting.disable_lut_rb == 0;
+        state.lighting.lut_rb.abs_input = regs.lighting.abs_lut_input.disable_rb == 0;
+        state.lighting.lut_rb.type = regs.lighting.lut_input.rb.Value();
+        state.lighting.lut_rb.scale = regs.lighting.lut_scale.GetScale(regs.lighting.lut_scale.rb);
+
+        state.lighting.config = regs.lighting.config;
+        state.lighting.fresnel_selector = regs.lighting.fresnel_selector;
+        state.lighting.bump_mode = regs.lighting.bump_mode;
+        state.lighting.bump_selector = regs.lighting.bump_selector;
+        state.lighting.bump_renorm = regs.lighting.disable_bump_renorm == 0;
+        state.lighting.clamp_highlights = regs.lighting.clamp_highlights != 0;
 
         return res;
     }
 
     bool TevStageUpdatesCombinerBufferColor(unsigned stage_index) const {
-        return (stage_index < 4) && (combiner_buffer_input & (1 << stage_index));
+        return (stage_index < 4) && (state.combiner_buffer_input & (1 << stage_index));
     }
 
     bool TevStageUpdatesCombinerBufferAlpha(unsigned stage_index) const {
-        return (stage_index < 4) && ((combiner_buffer_input >> 4) & (1 << stage_index));
+        return (stage_index < 4) && ((state.combiner_buffer_input >> 4) & (1 << stage_index));
     }
 
     bool operator ==(const PicaShaderConfig& o) const {
-        return std::memcmp(this, &o, sizeof(PicaShaderConfig)) == 0;
+        return std::memcmp(&state, &o.state, sizeof(PicaShaderConfig::State)) == 0;
+    };
+
+    // NOTE: MSVC15 (Update 2) doesn't think `delete`'d constructors and operators are TC.
+    //       This makes BitField not TC when used in a union or struct so we have to resort
+    //       to this ugly hack.
+    //       Once that bug is fixed we can use Pica::Regs::TevStageConfig here.
+    //       Doesn't include const_color because we don't sync it, see comment in CurrentConfig()
+    struct TevStageConfigRaw {
+        u32 sources_raw;
+        u32 modifiers_raw;
+        u32 ops_raw;
+        u32 scales_raw;
+        explicit operator Pica::Regs::TevStageConfig() const noexcept {
+            Pica::Regs::TevStageConfig stage;
+            stage.sources_raw = sources_raw;
+            stage.modifiers_raw = modifiers_raw;
+            stage.ops_raw = ops_raw;
+            stage.const_color = 0;
+            stage.scales_raw = scales_raw;
+            return stage;
+        }
     };
 
-    Pica::Regs::CompareFunc alpha_test_func = Pica::Regs::CompareFunc::Never;
-    std::array<Pica::Regs::TevStageConfig, 6> tev_stages = {};
-    u8 combiner_buffer_input = 0;
+    struct State {
 
-    struct {
-        struct {
-            unsigned num = 0;
-            bool directional = false;
-            bool two_sided_diffuse = false;
-            bool dist_atten_enable = false;
-            GLfloat dist_atten_scale = 0.0f;
-            GLfloat dist_atten_bias = 0.0f;
-        } light[8];
-
-        bool enable = false;
-        unsigned src_num = 0;
-        Pica::Regs::LightingBumpMode bump_mode = Pica::Regs::LightingBumpMode::None;
-        unsigned bump_selector = 0;
-        bool bump_renorm = false;
-        bool clamp_highlights = false;
-
-        Pica::Regs::LightingConfig config = Pica::Regs::LightingConfig::Config0;
-        Pica::Regs::LightingFresnelSelector fresnel_selector = Pica::Regs::LightingFresnelSelector::None;
+        Pica::Regs::CompareFunc alpha_test_func;
+        std::array<TevStageConfigRaw, 6> tev_stages;
+        u8 combiner_buffer_input;
 
         struct {
-            bool enable = false;
-            bool abs_input = false;
-            Pica::Regs::LightingLutInput type = Pica::Regs::LightingLutInput::NH;
-            float scale = 1.0f;
-        } lut_d0, lut_d1, lut_fr, lut_rr, lut_rg, lut_rb;
-    } lighting;
+            struct {
+                unsigned num;
+                bool directional;
+                bool two_sided_diffuse;
+                bool dist_atten_enable;
+                GLfloat dist_atten_scale;
+                GLfloat dist_atten_bias;
+            } light[8];
+
+            bool enable;
+            unsigned src_num;
+            Pica::Regs::LightingBumpMode bump_mode;
+            unsigned bump_selector;
+            bool bump_renorm;
+            bool clamp_highlights;
+
+            Pica::Regs::LightingConfig config;
+            Pica::Regs::LightingFresnelSelector fresnel_selector;
+
+            struct {
+                bool enable;
+                bool abs_input;
+                Pica::Regs::LightingLutInput type;
+                float scale;
+            } lut_d0, lut_d1, lut_fr, lut_rr, lut_rg, lut_rb;
+        } lighting;
+
+    } state;
 };
+#if (__GNUC__ >= 5) || defined(__clang__) || defined(_MSC_VER)
+static_assert(std::is_trivially_copyable<PicaShaderConfig::State>::value, "PicaShaderConfig::State must be trivially copyable");
+#endif
 
 namespace std {
 
 template <>
 struct hash<PicaShaderConfig> {
     size_t operator()(const PicaShaderConfig& k) const {
-        return Common::ComputeHash64(&k, sizeof(PicaShaderConfig));
+        return Common::ComputeHash64(&k.state, sizeof(PicaShaderConfig::State));
     }
 };
 
diff --git a/src/video_core/renderer_opengl/gl_shader_gen.cpp b/src/video_core/renderer_opengl/gl_shader_gen.cpp
index 9011caa39..0890adb12 100644
--- a/src/video_core/renderer_opengl/gl_shader_gen.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_gen.cpp
@@ -287,7 +287,7 @@ static void AppendAlphaTestCondition(std::string& out, Regs::CompareFunc func) {
 
 /// Writes the code to emulate the specified TEV stage
 static void WriteTevStage(std::string& out, const PicaShaderConfig& config, unsigned index) {
-    auto& stage = config.tev_stages[index];
+    const auto stage = static_cast<const Pica::Regs::TevStageConfig>(config.state.tev_stages[index]);
     if (!IsPassThroughTevStage(stage)) {
         std::string index_name = std::to_string(index);
 
@@ -331,6 +331,8 @@ static void WriteTevStage(std::string& out, const PicaShaderConfig& config, unsi
 
 /// Writes the code to emulate fragment lighting
 static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
+    const auto& lighting = config.state.lighting;
+
     // Define lighting globals
     out += "vec4 diffuse_sum = vec4(0.0, 0.0, 0.0, 1.0);\n"
            "vec4 specular_sum = vec4(0.0, 0.0, 0.0, 1.0);\n"
@@ -338,17 +340,17 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
            "vec3 refl_value = vec3(0.0);\n";
 
     // Compute fragment normals
-    if (config.lighting.bump_mode == Pica::Regs::LightingBumpMode::NormalMap) {
+    if (lighting.bump_mode == Pica::Regs::LightingBumpMode::NormalMap) {
         // Bump mapping is enabled using a normal map, read perturbation vector from the selected texture
-        std::string bump_selector = std::to_string(config.lighting.bump_selector);
+        std::string bump_selector = std::to_string(lighting.bump_selector);
         out += "vec3 surface_normal = 2.0 * texture(tex[" + bump_selector + "], texcoord[" + bump_selector + "]).rgb - 1.0;\n";
 
         // Recompute Z-component of perturbation if 'renorm' is enabled, this provides a higher precision result
-        if (config.lighting.bump_renorm) {
+        if (lighting.bump_renorm) {
             std::string val = "(1.0 - (surface_normal.x*surface_normal.x + surface_normal.y*surface_normal.y))";
             out += "surface_normal.z = sqrt(max(" + val + ", 0.0));\n";
         }
-    } else if (config.lighting.bump_mode == Pica::Regs::LightingBumpMode::TangentMap) {
+    } else if (lighting.bump_mode == Pica::Regs::LightingBumpMode::TangentMap) {
         // Bump mapping is enabled using a tangent map
         LOG_CRITICAL(HW_GPU, "unimplemented bump mapping mode (tangent mapping)");
         UNIMPLEMENTED();
@@ -361,7 +363,7 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
     out += "vec3 normal = normalize(quaternion_rotate(normquat, surface_normal));\n";
 
     // Gets the index into the specified lookup table for specular lighting
-    auto GetLutIndex = [config](unsigned light_num, Regs::LightingLutInput input, bool abs) {
+    auto GetLutIndex = [&lighting](unsigned light_num, Regs::LightingLutInput input, bool abs) {
         const std::string half_angle = "normalize(normalize(view) + light_vector)";
         std::string index;
         switch (input) {
@@ -389,7 +391,7 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
 
         if (abs) {
             // LUT index is in the range of (0.0, 1.0)
-            index = config.lighting.light[light_num].two_sided_diffuse ? "abs(" + index + ")" : "max(" + index + ", 0.f)";
+            index = lighting.light[light_num].two_sided_diffuse ? "abs(" + index + ")" : "max(" + index + ", 0.f)";
             return "(FLOAT_255 * clamp(" + index + ", 0.0, 1.0))";
         } else {
             // LUT index is in the range of (-1.0, 1.0)
@@ -407,8 +409,8 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
     };
 
     // Write the code to emulate each enabled light
-    for (unsigned light_index = 0; light_index < config.lighting.src_num; ++light_index) {
-        const auto& light_config = config.lighting.light[light_index];
+    for (unsigned light_index = 0; light_index < lighting.src_num; ++light_index) {
+        const auto& light_config = lighting.light[light_index];
         std::string light_src = "light_src[" + std::to_string(light_config.num) + "]";
 
         // Compute light vector (directional or positional)
@@ -432,39 +434,39 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
         }
 
         // If enabled, clamp specular component if lighting result is negative
-        std::string clamp_highlights = config.lighting.clamp_highlights ? "(dot(light_vector, normal) <= 0.0 ? 0.0 : 1.0)" : "1.0";
+        std::string clamp_highlights = lighting.clamp_highlights ? "(dot(light_vector, normal) <= 0.0 ? 0.0 : 1.0)" : "1.0";
 
         // Specular 0 component
         std::string d0_lut_value = "1.0";
-        if (config.lighting.lut_d0.enable && Pica::Regs::IsLightingSamplerSupported(config.lighting.config, Pica::Regs::LightingSampler::Distribution0)) {
+        if (lighting.lut_d0.enable && Pica::Regs::IsLightingSamplerSupported(lighting.config, Pica::Regs::LightingSampler::Distribution0)) {
             // Lookup specular "distribution 0" LUT value
-            std::string index = GetLutIndex(light_config.num, config.lighting.lut_d0.type, config.lighting.lut_d0.abs_input);
-            d0_lut_value = "(" + std::to_string(config.lighting.lut_d0.scale) + " * " + GetLutValue(Regs::LightingSampler::Distribution0, index) + ")";
+            std::string index = GetLutIndex(light_config.num, lighting.lut_d0.type, lighting.lut_d0.abs_input);
+            d0_lut_value = "(" + std::to_string(lighting.lut_d0.scale) + " * " + GetLutValue(Regs::LightingSampler::Distribution0, index) + ")";
         }
         std::string specular_0 = "(" + d0_lut_value + " * " + light_src + ".specular_0)";
 
         // If enabled, lookup ReflectRed value, otherwise, 1.0 is used
-        if (config.lighting.lut_rr.enable && Pica::Regs::IsLightingSamplerSupported(config.lighting.config, Pica::Regs::LightingSampler::ReflectRed)) {
-            std::string index = GetLutIndex(light_config.num, config.lighting.lut_rr.type, config.lighting.lut_rr.abs_input);
-            std::string value = "(" + std::to_string(config.lighting.lut_rr.scale) + " * " + GetLutValue(Regs::LightingSampler::ReflectRed, index) + ")";
+        if (lighting.lut_rr.enable && Pica::Regs::IsLightingSamplerSupported(lighting.config, Pica::Regs::LightingSampler::ReflectRed)) {
+            std::string index = GetLutIndex(light_config.num, lighting.lut_rr.type, lighting.lut_rr.abs_input);
+            std::string value = "(" + std::to_string(lighting.lut_rr.scale) + " * " + GetLutValue(Regs::LightingSampler::ReflectRed, index) + ")";
             out += "refl_value.r = " + value + ";\n";
         } else {
             out += "refl_value.r = 1.0;\n";
         }
 
         // If enabled, lookup ReflectGreen value, otherwise, ReflectRed value is used
-        if (config.lighting.lut_rg.enable && Pica::Regs::IsLightingSamplerSupported(config.lighting.config, Pica::Regs::LightingSampler::ReflectGreen)) {
-            std::string index = GetLutIndex(light_config.num, config.lighting.lut_rg.type, config.lighting.lut_rg.abs_input);
-            std::string value = "(" + std::to_string(config.lighting.lut_rg.scale) + " * " + GetLutValue(Regs::LightingSampler::ReflectGreen, index) + ")";
+        if (lighting.lut_rg.enable && Pica::Regs::IsLightingSamplerSupported(lighting.config, Pica::Regs::LightingSampler::ReflectGreen)) {
+            std::string index = GetLutIndex(light_config.num, lighting.lut_rg.type, lighting.lut_rg.abs_input);
+            std::string value = "(" + std::to_string(lighting.lut_rg.scale) + " * " + GetLutValue(Regs::LightingSampler::ReflectGreen, index) + ")";
             out += "refl_value.g = " + value + ";\n";
         } else {
             out += "refl_value.g = refl_value.r;\n";
         }
 
         // If enabled, lookup ReflectBlue value, otherwise, ReflectRed value is used
-        if (config.lighting.lut_rb.enable && Pica::Regs::IsLightingSamplerSupported(config.lighting.config, Pica::Regs::LightingSampler::ReflectBlue)) {
-            std::string index = GetLutIndex(light_config.num, config.lighting.lut_rb.type, config.lighting.lut_rb.abs_input);
-            std::string value = "(" + std::to_string(config.lighting.lut_rb.scale) + " * " + GetLutValue(Regs::LightingSampler::ReflectBlue, index) + ")";
+        if (lighting.lut_rb.enable && Pica::Regs::IsLightingSamplerSupported(lighting.config, Pica::Regs::LightingSampler::ReflectBlue)) {
+            std::string index = GetLutIndex(light_config.num, lighting.lut_rb.type, lighting.lut_rb.abs_input);
+            std::string value = "(" + std::to_string(lighting.lut_rb.scale) + " * " + GetLutValue(Regs::LightingSampler::ReflectBlue, index) + ")";
             out += "refl_value.b = " + value + ";\n";
         } else {
             out += "refl_value.b = refl_value.r;\n";
@@ -472,27 +474,27 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
 
         // Specular 1 component
         std::string d1_lut_value = "1.0";
-        if (config.lighting.lut_d1.enable && Pica::Regs::IsLightingSamplerSupported(config.lighting.config, Pica::Regs::LightingSampler::Distribution1)) {
+        if (lighting.lut_d1.enable && Pica::Regs::IsLightingSamplerSupported(lighting.config, Pica::Regs::LightingSampler::Distribution1)) {
             // Lookup specular "distribution 1" LUT value
-            std::string index = GetLutIndex(light_config.num, config.lighting.lut_d1.type, config.lighting.lut_d1.abs_input);
-            d1_lut_value = "(" + std::to_string(config.lighting.lut_d1.scale) + " * " + GetLutValue(Regs::LightingSampler::Distribution1, index) + ")";
+            std::string index = GetLutIndex(light_config.num, lighting.lut_d1.type, lighting.lut_d1.abs_input);
+            d1_lut_value = "(" + std::to_string(lighting.lut_d1.scale) + " * " + GetLutValue(Regs::LightingSampler::Distribution1, index) + ")";
         }
         std::string specular_1 = "(" + d1_lut_value + " * refl_value * " + light_src + ".specular_1)";
 
         // Fresnel
-        if (config.lighting.lut_fr.enable && Pica::Regs::IsLightingSamplerSupported(config.lighting.config, Pica::Regs::LightingSampler::Fresnel)) {
+        if (lighting.lut_fr.enable && Pica::Regs::IsLightingSamplerSupported(lighting.config, Pica::Regs::LightingSampler::Fresnel)) {
             // Lookup fresnel LUT value
-            std::string index = GetLutIndex(light_config.num, config.lighting.lut_fr.type, config.lighting.lut_fr.abs_input);
-            std::string value = "(" + std::to_string(config.lighting.lut_fr.scale) + " * " + GetLutValue(Regs::LightingSampler::Fresnel, index) + ")";
+            std::string index = GetLutIndex(light_config.num, lighting.lut_fr.type, lighting.lut_fr.abs_input);
+            std::string value = "(" + std::to_string(lighting.lut_fr.scale) + " * " + GetLutValue(Regs::LightingSampler::Fresnel, index) + ")";
 
             // Enabled for difffuse lighting alpha component
-            if (config.lighting.fresnel_selector == Pica::Regs::LightingFresnelSelector::PrimaryAlpha ||
-                config.lighting.fresnel_selector == Pica::Regs::LightingFresnelSelector::Both)
+            if (lighting.fresnel_selector == Pica::Regs::LightingFresnelSelector::PrimaryAlpha ||
+                lighting.fresnel_selector == Pica::Regs::LightingFresnelSelector::Both)
                 out += "diffuse_sum.a  *= " + value + ";\n";
 
             // Enabled for the specular lighting alpha component
-            if (config.lighting.fresnel_selector == Pica::Regs::LightingFresnelSelector::SecondaryAlpha ||
-                config.lighting.fresnel_selector == Pica::Regs::LightingFresnelSelector::Both)
+            if (lighting.fresnel_selector == Pica::Regs::LightingFresnelSelector::SecondaryAlpha ||
+                lighting.fresnel_selector == Pica::Regs::LightingFresnelSelector::Both)
                 out += "specular_sum.a *= " + value + ";\n";
         }
 
@@ -510,6 +512,8 @@ static void WriteLighting(std::string& out, const PicaShaderConfig& config) {
 }
 
 std::string GenerateFragmentShader(const PicaShaderConfig& config) {
+    const auto& state = config.state;
+
     std::string out = R"(
 #version 330 core
 #define NUM_TEV_STAGES 6
@@ -555,24 +559,24 @@ vec4 secondary_fragment_color = vec4(0.0);
 )";
 
     // Do not do any sort of processing if it's obvious we're not going to pass the alpha test
-    if (config.alpha_test_func == Regs::CompareFunc::Never) {
+    if (state.alpha_test_func == Regs::CompareFunc::Never) {
         out += "discard; }";
         return out;
     }
 
-    if (config.lighting.enable)
+    if (state.lighting.enable)
         WriteLighting(out, config);
 
     out += "vec4 combiner_buffer = vec4(0.0);\n";
     out += "vec4 next_combiner_buffer = tev_combiner_buffer_color;\n";
     out += "vec4 last_tex_env_out = vec4(0.0);\n";
 
-    for (size_t index = 0; index < config.tev_stages.size(); ++index)
+    for (size_t index = 0; index < state.tev_stages.size(); ++index)
         WriteTevStage(out, config, (unsigned)index);
 
-    if (config.alpha_test_func != Regs::CompareFunc::Always) {
+    if (state.alpha_test_func != Regs::CompareFunc::Always) {
         out += "if (";
-        AppendAlphaTestCondition(out, config.alpha_test_func);
+        AppendAlphaTestCondition(out, state.alpha_test_func);
         out += ") discard;\n";
     }
 
diff --git a/src/video_core/renderer_opengl/gl_shader_gen.h b/src/video_core/renderer_opengl/gl_shader_gen.h
index 3eb07d57a..bef3249cf 100644
--- a/src/video_core/renderer_opengl/gl_shader_gen.h
+++ b/src/video_core/renderer_opengl/gl_shader_gen.h
@@ -6,7 +6,7 @@
 
 #include <string>
 
-struct PicaShaderConfig;
+union PicaShaderConfig;
 
 namespace GLShader {