From 53b4a1af0f8a8c1e7c0ad27c76adf3b0e86bef13 Mon Sep 17 00:00:00 2001
From: Rodolfo Bogado <rodolfoosvaldobogado@gmail.com>
Date: Wed, 14 Nov 2018 00:02:54 -0300
Subject: add AlphaToCoverage and AlphaToOne

---
 src/video_core/engines/maxwell_3d.h              |  8 +++++++-
 src/video_core/renderer_opengl/gl_rasterizer.cpp |  7 +++++++
 src/video_core/renderer_opengl/gl_rasterizer.h   |  3 +++
 src/video_core/renderer_opengl/gl_state.cpp      | 17 +++++++++++++++++
 src/video_core/renderer_opengl/gl_state.h        |  5 +++++
 5 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h
index f2d69814e..753aff57f 100644
--- a/src/video_core/engines/maxwell_3d.h
+++ b/src/video_core/engines/maxwell_3d.h
@@ -726,7 +726,12 @@ public:
 
                 u32 zeta_enable;
 
-                INSERT_PADDING_WORDS(0x8);
+                union {
+                    BitField<1, 1, u32> alpha_to_coverage;
+                    BitField<2, 1, u32> alpha_to_one;
+                } multisample_control;
+
+                INSERT_PADDING_WORDS(0x7);
 
                 struct {
                     u32 tsc_address_high;
@@ -1149,6 +1154,7 @@ ASSERT_REG_POSITION(screen_y_control, 0x4EB);
 ASSERT_REG_POSITION(vb_element_base, 0x50D);
 ASSERT_REG_POSITION(point_size, 0x546);
 ASSERT_REG_POSITION(zeta_enable, 0x54E);
+ASSERT_REG_POSITION(multisample_control, 0x54F);
 ASSERT_REG_POSITION(tsc, 0x557);
 ASSERT_REG_POSITION(tic, 0x55D);
 ASSERT_REG_POSITION(stencil_two_side_enable, 0x565);
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index 98799056c..d2e3fde65 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -583,6 +583,7 @@ void RasterizerOpenGL::DrawArrays() {
     ConfigureFramebuffers(state);
     SyncColorMask();
     SyncFragmentColorClampState();
+    SyncMultiSampleState();
     SyncDepthTestState();
     SyncStencilTestState();
     SyncBlendState();
@@ -1033,6 +1034,12 @@ void RasterizerOpenGL::SyncColorMask() {
     }
 }
 
+void RasterizerOpenGL::SyncMultiSampleState() {
+    const auto& regs = Core::System::GetInstance().GPU().Maxwell3D().regs;
+    state.multisample_control.alpha_to_coverage = regs.multisample_control.alpha_to_coverage != 0;
+    state.multisample_control.alpha_to_one = regs.multisample_control.alpha_to_one != 0;
+}
+
 void RasterizerOpenGL::SyncFragmentColorClampState() {
     const auto& regs = Core::System::GetInstance().GPU().Maxwell3D().regs;
     state.fragment_color_clamp.enabled = regs.frag_color_clamp != 0;
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.h b/src/video_core/renderer_opengl/gl_rasterizer.h
index d3fa0b6fc..8994e134a 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer.h
@@ -163,6 +163,9 @@ private:
     /// Syncs the the color clamp state
     void SyncFragmentColorClampState();
 
+    /// Syncs the alpha coverage and alpha to one
+    void SyncMultiSampleState();
+
     /// Syncs the scissor test state to match the guest state
     void SyncScissorTest();
 
diff --git a/src/video_core/renderer_opengl/gl_state.cpp b/src/video_core/renderer_opengl/gl_state.cpp
index 6998dd92b..f6d80614b 100644
--- a/src/video_core/renderer_opengl/gl_state.cpp
+++ b/src/video_core/renderer_opengl/gl_state.cpp
@@ -16,6 +16,8 @@ OpenGLState::OpenGLState() {
     // These all match default OpenGL values
     geometry_shaders.enabled = false;
     framebuffer_srgb.enabled = false;
+    multisample_control.alpha_to_coverage = false;
+    multisample_control.alpha_to_one = false;
     cull.enabled = false;
     cull.mode = GL_BACK;
     cull.front_face = GL_CCW;
@@ -504,6 +506,21 @@ void OpenGLState::Apply() const {
                          fragment_color_clamp.enabled ? GL_TRUE : GL_FALSE);
         }
     }
+    if (multisample_control.alpha_to_coverage != cur_state.multisample_control.alpha_to_coverage) {
+        if (multisample_control.alpha_to_coverage) {
+            glEnable(GL_SAMPLE_ALPHA_TO_COVERAGE);
+        } else {
+            glDisable(GL_SAMPLE_ALPHA_TO_COVERAGE);
+        }
+    }
+    if (multisample_control.alpha_to_one != cur_state.multisample_control.alpha_to_one) {
+        if (multisample_control.alpha_to_one) {
+            glEnable(GL_SAMPLE_ALPHA_TO_ONE);
+        } else {
+            glDisable(GL_SAMPLE_ALPHA_TO_ONE);
+        }
+    }
+
     ApplyColorMask();
     ApplyViewport();
     ApplyStencilTest();
diff --git a/src/video_core/renderer_opengl/gl_state.h b/src/video_core/renderer_opengl/gl_state.h
index 6079f6e0b..c8d951a7f 100644
--- a/src/video_core/renderer_opengl/gl_state.h
+++ b/src/video_core/renderer_opengl/gl_state.h
@@ -39,6 +39,11 @@ public:
         bool enabled; // GL_FRAMEBUFFER_SRGB
     } framebuffer_srgb;
 
+    struct {
+        bool alpha_to_coverage; // GL_ALPHA_TO_COVERAGE
+        bool alpha_to_one;      // GL_ALPHA_TO_ONE
+    } multisample_control;
+
     struct {
         bool enabled; // GL_CLAMP_FRAGMENT_COLOR_ARB
     } fragment_color_clamp;
-- 
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