Add anaglyph stereoscopic modes into opengl runtime

Implement also anaglyph red-cyan & green-magenta stereoscopic modes
for opengl runtime. APIs for C++ and QML. Add options into viewer.

Task-number: QT3DS-3981
Change-Id: Idb9f659b3799e954253e37045c1a3b2a55fb2779
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
Reviewed-by: Antti Määttä <antti.maatta@qt.io>

10 files changed, 72 insertions, 7 deletions

diff --git a/src/api/studio3d/q3dsviewersettings.cpp b/src/api/studio3d/q3dsviewersettings.cpp
index eb62c32..88d1d50 100644
--- a/src/api/studio3d/q3dsviewersettings.cpp
+++ b/src/api/studio3d/q3dsviewersettings.cpp
@@ -240,6 +240,8 @@ void Q3DSViewerSettings::setScaleMode(Q3DSViewerSettings::ScaleMode mode)
     \value StereoModeMono Renders presentation normally in mono.
     \value StereoModeTopBottom Renders presentation in stereoscopic top-bottom mode.
     \value StereoModeLeftRight Renders presentation in stereoscopic left-right mode.
+    \value StereoModeAnaglyphRedCyan Renders presentation in anaglyph red-cyan mode.
+    \value StereoModeAnaglyphGreenMagenta Renders presentation in anaglyph green-magenta mode.
 
     The default value is \c{StereoModeMono}.
 */
@@ -255,6 +257,8 @@ void Q3DSViewerSettings::setScaleMode(Q3DSViewerSettings::ScaleMode mode)
     \value StereoModeMono Renders presentation normally in mono.
     \value StereoModeTopBottom Renders presentation in stereoscopic top-bottom mode.
     \value StereoModeLeftRight Renders presentation in stereoscopic left-right mode.
+    \value StereoModeAnaglyphRedCyan Renders presentation in anaglyph red-cyan mode.
+    \value StereoModeAnaglyphGreenMagenta Renders presentation in anaglyph green-magenta mode.
 
     The default value is \c{StereoModeMono}.
  */
@@ -529,8 +533,12 @@ void Q3DSViewerSettingsPrivate::setStereoMode(Q3DSViewerSettings::StereoMode mod
             m_viewerApp->SetStereoMode(Q3DSViewer::ViewerStereoModes::Mono);
         else if (mode == Q3DSViewerSettings::StereoModeTopBottom)
             m_viewerApp->SetStereoMode(Q3DSViewer::ViewerStereoModes::TopBottom);
-        else
+        else if (mode == Q3DSViewerSettings::StereoModeLeftRight)
             m_viewerApp->SetStereoMode(Q3DSViewer::ViewerStereoModes::LeftRight);
+        else if (mode == Q3DSViewerSettings::StereoModeAnaglyphRedCyan)
+            m_viewerApp->SetStereoMode(Q3DSViewer::ViewerStereoModes::AnaglyphRedCyan);
+        else
+            m_viewerApp->SetStereoMode(Q3DSViewer::ViewerStereoModes::AnaglyphGreenMagenta);
     } else if (m_commandQueue) {
         m_commandQueue->m_stereoMode = mode;
         m_commandQueue->m_stereoModeChanged = true;
diff --git a/src/api/studio3d/q3dsviewersettings.h b/src/api/studio3d/q3dsviewersettings.h
index 1099e35..0a5e699 100644
--- a/src/api/studio3d/q3dsviewersettings.h
+++ b/src/api/studio3d/q3dsviewersettings.h
@@ -68,7 +68,9 @@ public:
     enum StereoMode {
         StereoModeMono,
         StereoModeTopBottom,
-        StereoModeLeftRight
+        StereoModeLeftRight,
+        StereoModeAnaglyphRedCyan,
+        StereoModeAnaglyphGreenMagenta
     };
 
     explicit Q3DSViewerSettings(QObject *parent = nullptr);
diff --git a/src/engine/Qt3DSRuntimeView.h b/src/engine/Qt3DSRuntimeView.h
index 4e0b420..e3f57d1 100644
--- a/src/engine/Qt3DSRuntimeView.h
+++ b/src/engine/Qt3DSRuntimeView.h
@@ -110,7 +110,9 @@ struct TegraRenderStereoModes
     enum Enum {
         Mono,
         TopBottom,
-        LeftRight
+        LeftRight,
+        AnaglyphRedCyan,
+        AnaglyphGreenMagenta
     };
 };
 
diff --git a/src/runtimerender/Qt3DSRenderContextCore.h b/src/runtimerender/Qt3DSRenderContextCore.h
index dab5be9..9a26876 100644
--- a/src/runtimerender/Qt3DSRenderContextCore.h
+++ b/src/runtimerender/Qt3DSRenderContextCore.h
@@ -57,7 +57,9 @@ namespace render {
         enum Enum {
             Mono,
             TopBottom,
-            LeftRight
+            LeftRight,
+            AnaglyphRedCyan,
+            AnaglyphGreenMagenta
         };
     };
 
diff --git a/src/runtimerender/rendererimpl/Qt3DSRendererImpl.cpp b/src/runtimerender/rendererimpl/Qt3DSRendererImpl.cpp
index 04b08c1..99d5c45 100644
--- a/src/runtimerender/rendererimpl/Qt3DSRendererImpl.cpp
+++ b/src/runtimerender/rendererimpl/Qt3DSRendererImpl.cpp
@@ -1142,6 +1142,24 @@ namespace render {
         theShader->m_Dimensions.Set(inDimensions);
         theShader->m_Sampler.Set(&inQuadTexture);
 
+        // Set anaglyph color multiplier based on mode & current eye
+        // Default non-anaglyph modes use just vec4(1.0,1.0,1.0,1.0)
+        auto stereoMode = m_qt3dsContext.GetStereoMode();
+        auto stereoView = m_qt3dsContext.GetStereoView();
+        QT3DSVec4 anaglyphColor(1.0);
+        if (stereoMode == StereoModes::AnaglyphRedCyan) {
+            if (stereoView == StereoViews::Left)
+                anaglyphColor = QT3DSVec4(1.0, 0.0, 0.0, 0.0);
+            else
+                anaglyphColor = QT3DSVec4(0.0, 1.0, 1.0, 0.0);
+        } else if (stereoMode == StereoModes::AnaglyphGreenMagenta) {
+            if (stereoView == StereoViews::Left)
+                anaglyphColor = QT3DSVec4(0.0, 1.0, 0.0, 0.0);
+            else
+                anaglyphColor = QT3DSVec4(1.0, 0.0, 1.0, 0.0);
+        }
+        theShader->m_anaglyphColor.Set(anaglyphColor);
+
         GenerateXYQuad();
         theContext.SetInputAssembler(m_QuadInputAssembler);
         theContext.Draw(NVRenderDrawMode::Triangles, m_QuadIndexBuffer->GetNumIndices(), 0);
diff --git a/src/runtimerender/rendererimpl/Qt3DSRendererImplShaders.cpp b/src/runtimerender/rendererimpl/Qt3DSRendererImplShaders.cpp
index c33aaeb..d69e46e 100644
--- a/src/runtimerender/rendererimpl/Qt3DSRendererImplShaders.cpp
+++ b/src/runtimerender/rendererimpl/Qt3DSRendererImplShaders.cpp
@@ -2430,10 +2430,11 @@ namespace render {
         vertexGenerator.Append("}");
 
         fragmentGenerator.AddUniform("layer_image", "sampler2D");
+        fragmentGenerator.AddUniform("anaglyphColor", "vec4");
         fragmentGenerator.Append("void main() {");
         fragmentGenerator.Append("\tvec2 theCoords = uv_coords;\n");
         fragmentGenerator.Append("\tvec4 theLayerTexture = texture2D( layer_image, theCoords );\n");
-        fragmentGenerator.Append("\tfragOutput = theLayerTexture;\n");
+        fragmentGenerator.Append("\tfragOutput = theLayerTexture * anaglyphColor;\n");
         fragmentGenerator.Append("}");
         NVRenderShaderProgram *theShader = GetProgramGenerator().CompileGeneratedShader(
             "layer shader", SShaderCacheProgramFlags(), TShaderFeatureSet());
diff --git a/src/runtimerender/rendererimpl/Qt3DSRendererImplShaders.h b/src/runtimerender/rendererimpl/Qt3DSRendererImplShaders.h
index 9753256..0d77121 100644
--- a/src/runtimerender/rendererimpl/Qt3DSRendererImplShaders.h
+++ b/src/runtimerender/rendererimpl/Qt3DSRendererImplShaders.h
@@ -341,7 +341,8 @@ namespace render {
         NVRenderCachedShaderProperty<QT3DSVec2> m_Dimensions;
         // The fourth member of text color is the opacity
         NVRenderCachedShaderProperty<NVRenderTexture2D *> m_Sampler;
-
+        // Color multiplier for anaglyph stereo modes
+        NVRenderCachedShaderProperty<QT3DSVec4> m_anaglyphColor;
         volatile QT3DSI32 mRefCount;
 
         SLayerSceneShader(NVRenderShaderProgram &inShader)
@@ -349,6 +350,7 @@ namespace render {
             , m_MVP("model_view_projection", inShader)
             , m_Dimensions("layer_dimensions", inShader)
             , m_Sampler("layer_image", inShader)
+            , m_anaglyphColor("anaglyphColor", inShader)
             , mRefCount(0)
         {
             m_Shader.addRef();
diff --git a/src/viewer/Qt3DSViewerApp.h b/src/viewer/Qt3DSViewerApp.h
index 441cd50..25d2ed7 100644
--- a/src/viewer/Qt3DSViewerApp.h
+++ b/src/viewer/Qt3DSViewerApp.h
@@ -95,7 +95,9 @@ struct ViewerStereoModes
     enum Enum {
         Mono,
         TopBottom,
-        LeftRight
+        LeftRight,
+        AnaglyphRedCyan,
+        AnaglyphGreenMagenta
     };
 };
 
diff --git a/tools/viewer/main.cpp b/tools/viewer/main.cpp
index 70da8fa..1bcbe9d 100644
--- a/tools/viewer/main.cpp
+++ b/tools/viewer/main.cpp
@@ -377,6 +377,10 @@ int main(int argc, char *argv[])
             appWindow->setProperty("stereoMode", Q3DSViewerSettings::StereoModeTopBottom);
         else if (stereoStr == QStringLiteral("leftright"))
             appWindow->setProperty("stereoMode", Q3DSViewerSettings::StereoModeLeftRight);
+        else if (stereoStr == QStringLiteral("anaglyphredcyan"))
+            appWindow->setProperty("stereoMode", Q3DSViewerSettings::StereoModeAnaglyphRedCyan);
+        else if (stereoStr == QStringLiteral("anaglyphgreenmagenta"))
+            appWindow->setProperty("stereoMode", Q3DSViewerSettings::StereoModeAnaglyphGreenMagenta);
         else
             appWindow->setProperty("stereoMode", Q3DSViewerSettings::StereoModeMono);
     }
diff --git a/tools/viewer/qml/main.qml b/tools/viewer/qml/main.qml
index a53c0df..153753a 100644
--- a/tools/viewer/qml/main.qml
+++ b/tools/viewer/qml/main.qml
@@ -570,6 +570,10 @@ ApplicationWindow {
                                 else if (window.stereoMode === ViewerSettings.StereoModeTopBottom)
                                     window.stereoMode = ViewerSettings.StereoModeLeftRight;
                                 else if (window.stereoMode === ViewerSettings.StereoModeLeftRight)
+                                    window.stereoMode = ViewerSettings.StereoModeAnaglyphRedCyan;
+                                else if (window.stereoMode === ViewerSettings.StereoModeAnaglyphRedCyan)
+                                    window.stereoMode = ViewerSettings.StereoModeAnaglyphGreenMagenta;
+                                else if (window.stereoMode === ViewerSettings.StereoModeAnaglyphGreenMagenta)
                                     window.stereoMode = ViewerSettings.StereoModeMono;
                             }
                         }
@@ -610,6 +614,26 @@ ApplicationWindow {
                                 }
                             }
                             StyledMenuItem {
+                                id: stereoAnaglyphRedCyan
+                                text: qsTr("Anaglyph (Red-Cyan)")
+                                enabled: _viewerHelper.contentView === ViewerHelper.StudioView
+                                showCheckMark: window.stereoMode === ViewerSettings.StereoModeAnaglyphRedCyan
+                                onTriggered: {
+                                    if (enabled)
+                                        window.stereoMode = ViewerSettings.StereoModeAnaglyphRedCyan;
+                                }
+                            }
+                            StyledMenuItem {
+                                id: stereoAnaglyphGreenMagenta
+                                text: qsTr("Anaglyph (Green-Magenta)")
+                                enabled: _viewerHelper.contentView === ViewerHelper.StudioView
+                                showCheckMark: window.stereoMode === ViewerSettings.StereoModeAnaglyphGreenMagenta
+                                onTriggered: {
+                                    if (enabled)
+                                        window.stereoMode = ViewerSettings.StereoModeAnaglyphGreenMagenta;
+                                }
+                            }
+                            StyledMenuItem {
                                 id: stereoEyeSeparationUp
                                 text: qsTr("Increase Separation")
                                 shortcut: "Ctrl+Shift++"