From c3ad6e78207bc0f64a9687fd8f27fbe0f7606bc7 Mon Sep 17 00:00:00 2001
From: Jules Blok <jules.blok@gmail.com>
Date: Fri, 31 Oct 2014 15:53:08 +0100
Subject: [PATCH] PostProcessing: Add support for anaglyph stereoscopy mode.

---
 Source/Core/DolphinWX/VideoConfigDiag.cpp        | 11 ++++++++---
 Source/Core/DolphinWX/VideoConfigDiag.h          |  8 ++++++++
 Source/Core/VideoBackends/OGL/PostProcessing.cpp | 16 ++++++++++++----
 Source/Core/VideoCommon/VideoConfig.h            |  3 ++-
 4 files changed, 30 insertions(+), 8 deletions(-)

diff --git a/Source/Core/DolphinWX/VideoConfigDiag.cpp b/Source/Core/DolphinWX/VideoConfigDiag.cpp
index 93c7e83734..9b8b70b5d5 100644
--- a/Source/Core/DolphinWX/VideoConfigDiag.cpp
+++ b/Source/Core/DolphinWX/VideoConfigDiag.cpp
@@ -399,7 +399,7 @@ VideoConfigDiag::VideoConfigDiag(wxWindow* parent, const std::string &title, con
 	if (vconfig.backend_info.PPShaders.size())
 	{
 		wxFlexGridSizer* const szr_pp = new wxFlexGridSizer(3, 5, 5);
-		wxChoice *const choice_ppshader = new wxChoice(page_enh, -1);
+		choice_ppshader = new wxChoice(page_enh, -1);
 		RegisterControl(choice_ppshader, wxGetTranslation(ppshader_desc));
 		choice_ppshader->AppendString(_("(off)"));
 
@@ -428,6 +428,11 @@ VideoConfigDiag::VideoConfigDiag(wxWindow* parent, const std::string &title, con
 		szr_pp->Add(button_config_pp);
 		szr_enh->Add(szr_pp);
 	}
+	else
+	{
+		choice_ppshader = nullptr;
+		button_config_pp = nullptr;
+	}
 
 	// Scaled copy, PL, Bilinear filter
 	szr_enh->Add(CreateCheckBox(page_enh, _("Scaled EFB Copy"), wxGetTranslation(scaled_efb_copy_desc), vconfig.bCopyEFBScaled));
@@ -447,9 +452,9 @@ VideoConfigDiag::VideoConfigDiag(wxWindow* parent, const std::string &title, con
 	{
 		wxGridSizer* const szr_stereo = new wxGridSizer(2, 5, 5);
 
-		const wxString stereo_choices[] = { "Off", "Side-by-Side" };
+		const wxString stereo_choices[] = { "Off", "Side-by-Side", "Anaglyph" };
 		szr_stereo->Add(new wxStaticText(page_enh, -1, _("Stereo 3D Mode:")), 1, wxALIGN_CENTER_VERTICAL, 0);
-		szr_stereo->Add(CreateChoice(page_enh, vconfig.iStereoMode, wxGetTranslation(stereo_3d_desc), 2, stereo_choices));
+		szr_stereo->Add(CreateChoice(page_enh, vconfig.iStereoMode, wxGetTranslation(stereo_3d_desc), 3, stereo_choices));
 
 		wxSlider* const sep_slider = new wxSlider(page_enh, wxID_ANY, vconfig.iStereoSeparation, 30, 90, wxDefaultPosition, wxDefaultSize, wxSL_VALUE_LABEL);
 		sep_slider->Bind(wxEVT_SLIDER, &VideoConfigDiag::Event_StereoSep, this);
diff --git a/Source/Core/DolphinWX/VideoConfigDiag.h b/Source/Core/DolphinWX/VideoConfigDiag.h
index 2d21912c1c..7900039bea 100644
--- a/Source/Core/DolphinWX/VideoConfigDiag.h
+++ b/Source/Core/DolphinWX/VideoConfigDiag.h
@@ -198,6 +198,12 @@ protected:
 		virtual_xfb->Enable(vconfig.bUseXFB);
 		real_xfb->Enable(vconfig.bUseXFB);
 
+		// PP Shaders
+		if (choice_ppshader)
+			choice_ppshader->Enable(vconfig.iStereoMode != STEREO_ANAGLYPH);
+		if (button_config_pp)
+			button_config_pp->Enable(vconfig.iStereoMode != STEREO_ANAGLYPH);
+
 		// Things which shouldn't be changed during emulation
 		if (Core::IsRunning())
 		{
@@ -262,6 +268,8 @@ protected:
 
 	wxCheckBox* progressive_scan_checkbox;
 
+	wxChoice* choice_ppshader;
+
 	std::map<wxWindow*, wxString> ctrl_descs; // maps setting controls to their descriptions
 	std::map<wxWindow*, wxStaticText*> desc_texts; // maps dialog tabs (which are the parents of the setting controls) to their description text objects
 
diff --git a/Source/Core/VideoBackends/OGL/PostProcessing.cpp b/Source/Core/VideoBackends/OGL/PostProcessing.cpp
index 7cd99a05d7..905531226c 100644
--- a/Source/Core/VideoBackends/OGL/PostProcessing.cpp
+++ b/Source/Core/VideoBackends/OGL/PostProcessing.cpp
@@ -166,10 +166,13 @@ void OpenGLPostProcessing::ApplyShader()
 	m_shader.Destroy();
 	m_uniform_bindings.clear();
 
-	// load shader from disk
-	std::string default_shader = "void main() { SetOutput(Sample()); }\n";
+	// load shader code
 	std::string code = "";
-	if (g_ActiveConfig.sPostProcessingShader != "")
+	std::string default_shader = "void main() { SetOutput(Sample()); }\n";
+
+	if (g_ActiveConfig.iStereoMode == STEREO_ANAGLYPH)
+		code = "void main() { SetOutput(float4(SampleLayer(1).r, SampleLayer(0).gba)); }\n";
+	else if (g_ActiveConfig.sPostProcessingShader != "")
 		code = m_config.LoadShader();
 
 	if (code == "")
@@ -253,7 +256,12 @@ void OpenGLPostProcessing::CreateHeader()
 			"\treturn texture(samp9, float3(location, layer));\n"
 		"}\n"
 
-		"#define SampleOffset(offset) textureOffset(samp9, uv0, offset)\n"
+		"float4 SampleLayer(int layer)\n"
+		"{\n"
+			"\treturn texture(samp9, float3(uv0, layer));\n"
+		"}\n"
+
+		"#define SampleOffset(offset) textureOffset(samp9, float3(uv0, layer), offset)\n"
 
 		"float4 SampleFontLocation(float2 location)\n"
 		"{\n"
diff --git a/Source/Core/VideoCommon/VideoConfig.h b/Source/Core/VideoCommon/VideoConfig.h
index 2cd83e64c5..2eec352021 100644
--- a/Source/Core/VideoCommon/VideoConfig.h
+++ b/Source/Core/VideoCommon/VideoConfig.h
@@ -47,7 +47,8 @@ enum EFBScale
 enum StereoMode
 {
 	STEREO_OFF = 0,
-	STEREO_SBS
+	STEREO_SBS,
+	STEREO_ANAGLYPH
 };
 
 // NEVER inherit from this class.