drop support for non separate alpha as it seems to cause issues in some games

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -1077,15 +1077,15 @@ void RasterizerOpenGL::SyncBlendState() {
     state.independant_blend.enabled = regs.independent_blend_enable;
     if (!state.independant_blend.enabled) {
         auto& blend = state.blend[0];
-        blend.enabled = regs.blend.enable[0] != 0;
-        blend.separate_alpha = regs.blend.separate_alpha;
-        blend.rgb_equation = MaxwellToGL::BlendEquation(regs.blend.equation_rgb);
-        blend.src_rgb_func = MaxwellToGL::BlendFunc(regs.blend.factor_source_rgb);
-        blend.dst_rgb_func = MaxwellToGL::BlendFunc(regs.blend.factor_dest_rgb);
-        if (blend.separate_alpha) {
-            blend.a_equation = MaxwellToGL::BlendEquation(regs.blend.equation_a);
-            blend.src_a_func = MaxwellToGL::BlendFunc(regs.blend.factor_source_a);
-            blend.dst_a_func = MaxwellToGL::BlendFunc(regs.blend.factor_dest_a);
+        const auto& src = regs.blend;
+        blend.enabled = src.enable[0] != 0;
+        if (blend.enabled) {
+            blend.rgb_equation = MaxwellToGL::BlendEquation(src.equation_rgb);
+            blend.src_rgb_func = MaxwellToGL::BlendFunc(src.factor_source_rgb);
+            blend.dst_rgb_func = MaxwellToGL::BlendFunc(src.factor_dest_rgb);
+            blend.a_equation = MaxwellToGL::BlendEquation(src.equation_a);
+            blend.src_a_func = MaxwellToGL::BlendFunc(src.factor_source_a);
+            blend.dst_a_func = MaxwellToGL::BlendFunc(src.factor_dest_a);
         }
         for (std::size_t i = 1; i < Tegra::Engines::Maxwell3D::Regs::NumRenderTargets; i++) {
             state.blend[i].enabled = false;
@@ -1095,18 +1095,16 @@ void RasterizerOpenGL::SyncBlendState() {
 
     for (std::size_t i = 0; i < Tegra::Engines::Maxwell3D::Regs::NumRenderTargets; i++) {
         auto& blend = state.blend[i];
+        const auto& src = regs.independent_blend[i];
         blend.enabled = regs.blend.enable[i] != 0;
         if (!blend.enabled)
             continue;
-        blend.separate_alpha = regs.independent_blend[i].separate_alpha;
-        blend.rgb_equation = MaxwellToGL::BlendEquation(regs.independent_blend[i].equation_rgb);
-        blend.src_rgb_func = MaxwellToGL::BlendFunc(regs.independent_blend[i].factor_source_rgb);
-        blend.dst_rgb_func = MaxwellToGL::BlendFunc(regs.independent_blend[i].factor_dest_rgb);
-        if (blend.separate_alpha) {
-            blend.a_equation = MaxwellToGL::BlendEquation(regs.independent_blend[i].equation_a);
-            blend.src_a_func = MaxwellToGL::BlendFunc(regs.independent_blend[i].factor_source_a);
-            blend.dst_a_func = MaxwellToGL::BlendFunc(regs.independent_blend[i].factor_dest_a);
-        }
+        blend.rgb_equation = MaxwellToGL::BlendEquation(src.equation_rgb);
+        blend.src_rgb_func = MaxwellToGL::BlendFunc(src.factor_source_rgb);
+        blend.dst_rgb_func = MaxwellToGL::BlendFunc(src.factor_dest_rgb);
+        blend.a_equation = MaxwellToGL::BlendEquation(src.equation_a);
+        blend.src_a_func = MaxwellToGL::BlendFunc(src.factor_source_a);
+        blend.dst_a_func = MaxwellToGL::BlendFunc(src.factor_dest_a);
     }
 }
 

src/video_core/renderer_opengl/gl_state.cpp

@@ -309,27 +309,16 @@ void OpenGLState::ApplyGlobalBlending() const {
     if (!updated.enabled) {
         return;
     }
-    if (updated.separate_alpha) {
-        if (blend_changed || updated.src_rgb_func != current.src_rgb_func ||
-            updated.dst_rgb_func != current.dst_rgb_func ||
-            updated.src_a_func != current.src_a_func || updated.dst_a_func != current.dst_a_func) {
-            glBlendFuncSeparate(updated.src_rgb_func, updated.dst_rgb_func, updated.src_a_func,
-                                updated.dst_a_func);
-        }
-
-        if (blend_changed || updated.rgb_equation != current.rgb_equation ||
-            updated.a_equation != current.a_equation) {
-            glBlendEquationSeparate(updated.rgb_equation, updated.a_equation);
-        }
-    } else {
-        if (blend_changed || updated.src_rgb_func != current.src_rgb_func ||
-            updated.dst_rgb_func != current.dst_rgb_func) {
-            glBlendFunc(updated.src_rgb_func, updated.dst_rgb_func);
-        }
+    if (blend_changed || updated.src_rgb_func != current.src_rgb_func ||
+        updated.dst_rgb_func != current.dst_rgb_func || updated.src_a_func != current.src_a_func ||
+        updated.dst_a_func != current.dst_a_func) {
+        glBlendFuncSeparate(updated.src_rgb_func, updated.dst_rgb_func, updated.src_a_func,
+                            updated.dst_a_func);
+    }
 
-        if (blend_changed || updated.rgb_equation != current.rgb_equation) {
-            glBlendEquation(updated.rgb_equation);
-        }
+    if (blend_changed || updated.rgb_equation != current.rgb_equation ||
+        updated.a_equation != current.a_equation) {
+        glBlendEquationSeparate(updated.rgb_equation, updated.a_equation);
     }
 }
 
@@ -347,29 +336,17 @@ void OpenGLState::ApplyTargetBlending(std::size_t target, bool force) const {
     if (!updated.enabled) {
         return;
     }
-    if (updated.separate_alpha) {
-        if (blend_changed || updated.src_rgb_func != current.src_rgb_func ||
-            updated.dst_rgb_func != current.dst_rgb_func ||
-            updated.src_a_func != current.src_a_func || updated.dst_a_func != current.dst_a_func) {
-            glBlendFuncSeparateiARB(static_cast<GLuint>(target), updated.src_rgb_func,
-                                    updated.dst_rgb_func, updated.src_a_func, updated.dst_a_func);
-        }
-
-        if (blend_changed || updated.rgb_equation != current.rgb_equation ||
-            updated.a_equation != current.a_equation) {
-            glBlendEquationSeparateiARB(static_cast<GLuint>(target), updated.rgb_equation,
-                                        updated.a_equation);
-        }
-    } else {
-        if (blend_changed || updated.src_rgb_func != current.src_rgb_func ||
-            updated.dst_rgb_func != current.dst_rgb_func) {
-            glBlendFunciARB(static_cast<GLuint>(target), updated.src_rgb_func,
-                            updated.dst_rgb_func);
-        }
+    if (blend_changed || updated.src_rgb_func != current.src_rgb_func ||
+        updated.dst_rgb_func != current.dst_rgb_func || updated.src_a_func != current.src_a_func ||
+        updated.dst_a_func != current.dst_a_func) {
+        glBlendFuncSeparateiARB(static_cast<GLuint>(target), updated.src_rgb_func,
+                                updated.dst_rgb_func, updated.src_a_func, updated.dst_a_func);
+    }
 
-        if (blend_changed || updated.rgb_equation != current.rgb_equation) {
-            glBlendEquationiARB(static_cast<GLuint>(target), updated.rgb_equation);
-        }
+    if (blend_changed || updated.rgb_equation != current.rgb_equation ||
+        updated.a_equation != current.a_equation) {
+        glBlendEquationSeparateiARB(static_cast<GLuint>(target), updated.rgb_equation,
+                                    updated.a_equation);
     }
 }
 

src/video_core/renderer_opengl/gl_state.h

@@ -92,7 +92,6 @@ public:
 
     struct Blend {
         bool enabled;        // GL_BLEND
-        bool separate_alpha; // Independent blend enabled
         GLenum rgb_equation; // GL_BLEND_EQUATION_RGB
         GLenum a_equation;   // GL_BLEND_EQUATION_ALPHA
         GLenum src_rgb_func; // GL_BLEND_SRC_RGB