gl_rasterizer: Implement depth range.

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -570,6 +570,7 @@ void RasterizerOpenGL::DrawArrays() {
     SyncBlendState();
     SyncLogicOpState();
     SyncCullMode();
+    SyncDepthRange();
     SyncScissorTest();
     // Alpha Testing is synced on shaders.
     SyncTransformFeedback();
@@ -923,12 +924,11 @@ void RasterizerOpenGL::SyncCullMode() {
     }
 }
 
-void RasterizerOpenGL::SyncDepthScale() {
-    UNREACHABLE();
-}
+void RasterizerOpenGL::SyncDepthRange() {
+    const auto& regs = Core::System::GetInstance().GPU().Maxwell3D().regs;
 
-void RasterizerOpenGL::SyncDepthOffset() {
-    UNREACHABLE();
+    state.depth.depth_range_near = regs.viewport->depth_range_near;
+    state.depth.depth_range_far = regs.viewport->depth_range_far;
 }
 
 void RasterizerOpenGL::SyncDepthTestState() {

src/video_core/renderer_opengl/gl_rasterizer.h

@@ -144,11 +144,8 @@ private:
     /// Syncs the cull mode to match the guest state
     void SyncCullMode();
 
-    /// Syncs the depth scale to match the guest state
-    void SyncDepthScale();
-
-    /// Syncs the depth offset to match the guest state
-    void SyncDepthOffset();
+    /// Syncs the depth range to match the guest state
+    void SyncDepthRange();
 
     /// Syncs the depth test state to match the guest state
     void SyncDepthTestState();

src/video_core/renderer_opengl/gl_state.cpp

@@ -21,6 +21,8 @@ OpenGLState::OpenGLState() {
     depth.test_enabled = false;
     depth.test_func = GL_LESS;
     depth.write_mask = GL_TRUE;
+    depth.depth_range_near = 0.0f;
+    depth.depth_range_far = 1.0f;
 
     color_mask.red_enabled = GL_TRUE;
     color_mask.green_enabled = GL_TRUE;
@@ -119,6 +121,12 @@ void OpenGLState::Apply() const {
         glDepthMask(depth.write_mask);
     }
 
+    // Depth range
+    if (depth.depth_range_near != cur_state.depth.depth_range_near ||
+        depth.depth_range_far != cur_state.depth.depth_range_far) {
+        glDepthRange(depth.depth_range_near, depth.depth_range_far);
+    }
+
     // Color mask
     if (color_mask.red_enabled != cur_state.color_mask.red_enabled ||
         color_mask.green_enabled != cur_state.color_mask.green_enabled ||

src/video_core/renderer_opengl/gl_state.h

@@ -45,6 +45,8 @@ public:
         bool test_enabled;        // GL_DEPTH_TEST
         GLenum test_func;         // GL_DEPTH_FUNC
         GLboolean write_mask;     // GL_DEPTH_WRITEMASK
+        GLfloat depth_range_near; // GL_DEPTH_RANGE
+        GLfloat depth_range_far;  // GL_DEPTH_RANGE
     } depth;
 
     struct {