VideoCommon: Add a separate constants buffer for the geometry shader.

Source/Core/VideoCommon/GeometryShaderManager.cpp

@@ -0,0 +1,82 @@
+// Copyright 2013 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include <cfloat>
+#include <cmath>
+
+#include "VideoCommon/GeometryShaderGen.h"
+#include "VideoCommon/GeometryShaderManager.h"
+#include "VideoCommon/VideoCommon.h"
+#include "VideoCommon/VideoConfig.h"
+#include "VideoCommon/XFMemory.h"
+
+// track changes
+static bool s_projection_changed, s_viewport_changed;
+
+GeometryShaderConstants GeometryShaderManager::constants;
+bool GeometryShaderManager::dirty;
+
+void GeometryShaderManager::Init()
+{
+	memset(&constants, 0, sizeof(constants));
+
+	Dirty();
+}
+
+void GeometryShaderManager::Shutdown()
+{
+}
+
+void GeometryShaderManager::Dirty()
+{
+	s_projection_changed = true;
+	s_viewport_changed = true;
+
+	dirty = true;
+}
+
+// Syncs the shader constant buffers with xfmem
+void GeometryShaderManager::SetConstants()
+{
+	if (s_projection_changed)
+	{
+		s_projection_changed = false;
+
+		if (g_ActiveConfig.iStereoMode > 0 && xfmem.projection.type == GX_PERSPECTIVE)
+		{
+			float offset = (g_ActiveConfig.iStereoSeparation / 1000.0f) * (g_ActiveConfig.iStereoSeparationPercent / 100.0f);
+			constants.stereoparams[0] = (g_ActiveConfig.bStereoSwapEyes) ? offset : -offset;
+			constants.stereoparams[1] = (g_ActiveConfig.bStereoSwapEyes) ? -offset : offset;
+			constants.stereoparams[2] = (g_ActiveConfig.iStereoConvergence / 10.0f) * (g_ActiveConfig.iStereoConvergencePercent / 100.0f);
+		}
+		else
+		{
+			constants.stereoparams[0] = constants.stereoparams[1] = 0;
+		}
+	}
+
+	dirty = true;
+}
+
+void GeometryShaderManager::SetViewportChanged()
+{
+	s_viewport_changed = true;
+}
+
+void GeometryShaderManager::SetProjectionChanged()
+{
+	s_projection_changed = true;
+}
+
+void GeometryShaderManager::DoState(PointerWrap &p)
+{
+	p.Do(dirty);
+
+	if (p.GetMode() == PointerWrap::MODE_READ)
+	{
+		// Reload current state from global GPU state
+		// NOTE: This requires that all GPU memory has been loaded already.
+		Dirty();
+	}
+}