Maxwell3D: Implement Depth Mode.

This commit finishes adding depth mode that was reverted before due to
other unresolved issues.

src/video_core/engines/maxwell_3d.h

@@ -310,6 +310,11 @@ public:
             }
         };
 
+        enum class DepthMode : u32 {
+            MinusOneToOne = 0,
+            ZeroToOne = 1,
+        };
+
         enum class PrimitiveTopology : u32 {
             Points = 0x0,
             Lines = 0x1,
@@ -491,11 +496,6 @@ public:
             INSERT_UNION_PADDING_WORDS(1);
         };
 
-        enum class DepthMode : u32 {
-            MinusOneToOne = 0,
-            ZeroToOne = 1,
-        };
-
         enum class TessellationPrimitive : u32 {
             Isolines = 0,
             Triangles = 1,
@@ -676,7 +676,7 @@ public:
                     u32 count;
                 } vertex_buffer;
 
-                INSERT_UNION_PADDING_WORDS(1);
+                DepthMode depth_mode;
 
                 float clear_color[4];
                 float clear_depth;
@@ -1425,6 +1425,7 @@ ASSERT_REG_POSITION(rt, 0x200);
 ASSERT_REG_POSITION(viewport_transform, 0x280);
 ASSERT_REG_POSITION(viewports, 0x300);
 ASSERT_REG_POSITION(vertex_buffer, 0x35D);
+ASSERT_REG_POSITION(depth_mode, 0x35F);
 ASSERT_REG_POSITION(clear_color[0], 0x360);
 ASSERT_REG_POSITION(clear_depth, 0x364);
 ASSERT_REG_POSITION(clear_stencil, 0x368);

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -1028,6 +1028,10 @@ void RasterizerOpenGL::SyncViewport(OpenGLState& current_state) {
         flip_y = !flip_y;
     }
     state.clip_control.origin = flip_y ? GL_UPPER_LEFT : GL_LOWER_LEFT;
+    state.clip_control.depth_mode =
+        regs.depth_mode == Tegra::Engines::Maxwell3D::Regs::DepthMode::ZeroToOne
+            ? GL_ZERO_TO_ONE
+            : GL_NEGATIVE_ONE_TO_ONE;
 }
 
 void RasterizerOpenGL::SyncClipEnabled(

src/video_core/renderer_opengl/gl_state.cpp

@@ -411,8 +411,9 @@ void OpenGLState::ApplyAlphaTest() {
 }
 
 void OpenGLState::ApplyClipControl() {
-    if (UpdateValue(cur_state.clip_control.origin, clip_control.origin)) {
-        glClipControl(clip_control.origin, GL_NEGATIVE_ONE_TO_ONE);
+    if (UpdateTie(std::tie(cur_state.clip_control.origin, cur_state.clip_control.depth_mode),
+                  std::tie(clip_control.origin, clip_control.depth_mode))) {
+        glClipControl(clip_control.origin, clip_control.depth_mode);
     }
 }
 

src/video_core/renderer_opengl/gl_state.h

@@ -150,6 +150,7 @@ public:
 
     struct {
         GLenum origin = GL_LOWER_LEFT;
+        GLenum depth_mode = GL_NEGATIVE_ONE_TO_ONE;
     } clip_control;
 
     OpenGLState();