From 5389dedfa194460f325c29c9a54b9fde824aae27 Mon Sep 17 00:00:00 2001
From: Jannik Vogel <email@jannikvogel.de>
Date: Sat, 14 May 2016 10:16:45 +0200
Subject: [PATCH] OpenGL: Only update depth uniforms if the depth changed

---
 .../renderer_opengl/gl_rasterizer.cpp         | 24 +++++++++++++------
 .../renderer_opengl/gl_rasterizer.h           |  7 ++++--
 2 files changed, 22 insertions(+), 9 deletions(-)

diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index ed2e2f3ae..c09bc8857 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -104,7 +104,6 @@ RasterizerOpenGL::RasterizerOpenGL() : shader_dirty(true) {
 
     // Sync fixed function OpenGL state
     SyncCullMode();
-    SyncDepthModifiers();
     SyncBlendEnabled();
     SyncBlendFuncs();
     SyncBlendColor();
@@ -259,8 +258,10 @@ void RasterizerOpenGL::NotifyPicaRegisterChanged(u32 id) {
 
     // Depth modifiers
     case PICA_REG_INDEX(viewport_depth_range):
+        SyncDepthScale();
+        break;
     case PICA_REG_INDEX(viewport_depth_near_plane):
-        SyncDepthModifiers();
+        SyncDepthOffset();
         break;
 
     // Depth buffering
@@ -880,6 +881,8 @@ void RasterizerOpenGL::SetShader() {
         glUniformBlockBinding(current_shader->shader.handle, block_index, 0);
 
         // Update uniforms
+        SyncDepthScale();
+        SyncDepthOffset();
         SyncAlphaTest();
         SyncCombinerColor();
         auto& tev_stages = Pica::g_state.regs.GetTevStages();
@@ -922,13 +925,20 @@ void RasterizerOpenGL::SyncCullMode() {
     }
 }
 
-void RasterizerOpenGL::SyncDepthModifiers() {
+void RasterizerOpenGL::SyncDepthScale() {
     float depth_scale = Pica::float24::FromRaw(Pica::g_state.regs.viewport_depth_range).ToFloat32();
-    float depth_offset = Pica::float24::FromRaw(Pica::g_state.regs.viewport_depth_near_plane).ToFloat32();
+    if (depth_scale != uniform_block_data.data.depth_scale) {
+        uniform_block_data.data.depth_scale = depth_scale;
+        uniform_block_data.dirty = true;
+    }
+}
 
-    uniform_block_data.data.depth_scale = depth_scale;
-    uniform_block_data.data.depth_offset = depth_offset;
-    uniform_block_data.dirty = true;
+void RasterizerOpenGL::SyncDepthOffset() {
+    float depth_offset = Pica::float24::FromRaw(Pica::g_state.regs.viewport_depth_near_plane).ToFloat32();
+    if (depth_offset != uniform_block_data.data.depth_offset) {
+        uniform_block_data.data.depth_offset = depth_offset;
+        uniform_block_data.dirty = true;
+    }
 }
 
 void RasterizerOpenGL::SyncBlendEnabled() {
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.h b/src/video_core/renderer_opengl/gl_rasterizer.h
index f1b4fbed8..d70369400 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.h
+++ b/src/video_core/renderer_opengl/gl_rasterizer.h
@@ -339,8 +339,11 @@ private:
     /// Syncs the cull mode to match the PICA register
     void SyncCullMode();
 
-    /// Syncs the depth scale and offset to match the PICA registers
-    void SyncDepthModifiers();
+    /// Syncs the depth scale to match the PICA register
+    void SyncDepthScale();
+
+    /// Syncs the depth offset to match the PICA register
+    void SyncDepthOffset();
 
     /// Syncs the blend enabled status to match the PICA register
     void SyncBlendEnabled();